dlls/user/dde/misc.c

   1 /* -*- tab-width: 8; c-basic-offset: 4 -*- */
   2
   3 /*
   4  * DDEML library
   5  *
   6  * Copyright 1997 Alexandre Julliard
   7  * Copyright 1997 Len White
   8  * Copyright 1999 Keith Matthews
   9  * Copyright 2000 Corel
  10  * Copyright 2001 Eric Pouech
  11  *
  12  * This library is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU Lesser General Public
  14  * License as published by the Free Software Foundation; either
  15  * version 2.1 of the License, or (at your option) any later version.
  16  *
  17  * This library is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * Lesser General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Lesser General Public
  23  * License along with this library; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #include "config.h"
  28 #include "wine/port.h"
  29
  30 #include <string.h>
  31 #include <stdarg.h>
  32 #include <stdio.h>
  33 #include "windef.h"
  34 #include "winbase.h"
  35 #include "wingdi.h"
  36 #include "winuser.h"
  37 #include "winerror.h"
  38 #include "dde.h"
  39 #include "ddeml.h"
  40 #include "win.h"
  41 #include "wine/debug.h"
  42 #include "dde/dde_private.h"
  43
  44 WINE_DEFAULT_DEBUG_CHANNEL(ddeml);
  45
  46 /* convert between ATOM and HSZ avoiding compiler warnings */
  47 #define ATOM2HSZ(atom)  ((HSZ)  (ULONG_PTR)(atom))
  48 #define HSZ2ATOM(hsz)   ((ATOM) (ULONG_PTR)(hsz))
  49
  50 static WDML_INSTANCE*   WDML_InstanceList = NULL;
  51 static DWORD            WDML_MaxInstanceID = 0;  /* OK for present, have to worry about wrap-around later */
  52 const char              WDML_szEventClass[] = "DdeEventClass";
  53
  54 static CRITICAL_SECTION_DEBUG critsect_debug =
  55 {
  56     0, 0, &WDML_CritSect,
  57     { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
  58       0, 0, { 0, (DWORD)(__FILE__ ": WDML_CritSect") }
  59 };
  60 CRITICAL_SECTION WDML_CritSect = { &critsect_debug, -1, 0, 0, 0, 0 };
  61
  62 /* ================================================================
  63  *
  64  *                      Pure DDE (non DDEML) management
  65  *
  66  * ================================================================ */
  67
  68
  69 /*****************************************************************
  70  *            PackDDElParam (USER32.@)
  71  *
  72  * RETURNS
  73  *   the packed lParam
  74  */
  75 LPARAM WINAPI PackDDElParam(UINT msg, UINT_PTR uiLo, UINT_PTR uiHi)
  76 {
  77     HGLOBAL hMem;
  78     UINT_PTR *params;
  79
  80     switch (msg)
  81     {
  82     case WM_DDE_ACK:
  83     case WM_DDE_ADVISE:
  84     case WM_DDE_DATA:
  85     case WM_DDE_POKE:
  86         if (!(hMem = GlobalAlloc(GMEM_DDESHARE, sizeof(UINT_PTR) * 2)))
  87         {
  88             ERR("GlobalAlloc failed\n");
  89             return 0;
  90         }
  91         if (!(params = GlobalLock(hMem)))
  92         {
  93             ERR("GlobalLock failed (%p)\n", hMem);
  94             return 0;
  95         }
  96         params[0] = uiLo;
  97         params[1] = uiHi;
  98         GlobalUnlock(hMem);
  99         return (LPARAM)hMem;
 100
 101     case WM_DDE_EXECUTE:
 102         return uiHi;
 103
 104     default:
 105         return MAKELPARAM(uiLo, uiHi);
 106     }
 107 }
 108
 109
 110 /*****************************************************************
 111  *            UnpackDDElParam (USER32.@)
 112  *
 113  * RETURNS
 114  *   success: nonzero
 115  *   failure: zero
 116  */
 117 BOOL WINAPI UnpackDDElParam(UINT msg, LPARAM lParam,
 118                             PUINT_PTR uiLo, PUINT_PTR uiHi)
 119 {
 120     UINT_PTR *params;
 121
 122     switch (msg)
 123     {
 124     case WM_DDE_ACK:
 125     case WM_DDE_ADVISE:
 126     case WM_DDE_DATA:
 127     case WM_DDE_POKE:
 128         if (!lParam) return FALSE;
 129         if (!(params = GlobalLock( (HGLOBAL)lParam )))
 130         {
 131             ERR("GlobalLock failed (%lx)\n", lParam);
 132             return FALSE;
 133         }
 134         TRACE("unpacked: low %08x, high %08x\n", params[0], params[1]);
 135         if (uiLo) *uiLo = params[0];
 136         if (uiHi) *uiHi = params[1];
 137         GlobalUnlock( (HGLOBAL)lParam );
 138         return TRUE;
 139
 140     case WM_DDE_EXECUTE:
 141         if (uiLo) *uiLo = 0;
 142         if (uiHi) *uiHi = lParam;
 143         return TRUE;
 144
 145     default:
 146         if (uiLo) *uiLo = LOWORD(lParam);
 147         if (uiHi) *uiHi = HIWORD(lParam);
 148         return TRUE;
 149     }
 150 }
 151
 152
 153 /*****************************************************************
 154  *            FreeDDElParam (USER32.@)
 155  *
 156  * RETURNS
 157  *   success: nonzero
 158  *   failure: zero
 159  */
 160 BOOL WINAPI FreeDDElParam(UINT msg, LPARAM lParam)
 161 {
 162     switch (msg)
 163     {
 164     case WM_DDE_ACK:
 165     case WM_DDE_ADVISE:
 166     case WM_DDE_DATA:
 167     case WM_DDE_POKE:
 168         /* first check if it's a global handle */
 169         if (!GlobalHandle( (LPVOID)lParam )) return TRUE;
 170         return !GlobalFree( (HGLOBAL)lParam );
 171
 172     default:
 173         return TRUE;
 174      }
 175 }
 176
 177
 178 /*****************************************************************
 179  *            ReuseDDElParam (USER32.@)
 180  *
 181  * RETURNS
 182  *   the packed lParam
 183  */
 184 LPARAM WINAPI ReuseDDElParam(LPARAM lParam, UINT msgIn, UINT msgOut,
 185                              UINT_PTR uiLo, UINT_PTR uiHi)
 186 {
 187     UINT_PTR *params;
 188
 189     switch (msgIn)
 190     {
 191     case WM_DDE_ACK:
 192     case WM_DDE_ADVISE:
 193     case WM_DDE_DATA:
 194     case WM_DDE_POKE:
 195         switch(msgOut)
 196         {
 197         case WM_DDE_ACK:
 198         case WM_DDE_ADVISE:
 199         case WM_DDE_DATA:
 200         case WM_DDE_POKE:
 201             if (!lParam) return 0;
 202             if (!(params = GlobalLock( (HGLOBAL)lParam )))
 203             {
 204                 ERR("GlobalLock failed\n");
 205                 return 0;
 206             }
 207             params[0] = uiLo;
 208             params[1] = uiHi;
 209             TRACE("Reusing pack %08x %08x\n", uiLo, uiHi);
 210             GlobalLock( (HGLOBAL)lParam );
 211             return lParam;
 212
 213         case WM_DDE_EXECUTE:
 214             FreeDDElParam( msgIn, lParam );
 215             return uiHi;
 216
 217         default:
 218             FreeDDElParam( msgIn, lParam );
 219             return MAKELPARAM(uiLo, uiHi);
 220         }
 221
 222     default:
 223         return PackDDElParam( msgOut, uiLo, uiHi );
 224     }
 225 }
 226
 227 /*****************************************************************
 228  *            ImpersonateDdeClientWindow (USER32.@)
 229  *
 230  * PARAMS
 231  * hWndClient     [I] handle to DDE client window
 232  * hWndServer     [I] handle to DDE server window
 233  */
 234 BOOL WINAPI ImpersonateDdeClientWindow(HWND hWndClient, HWND hWndServer)
 235 {
 236      FIXME("(%p %p): stub\n", hWndClient, hWndServer);
 237      return FALSE;
 238 }
 239
 240 /*****************************************************************
 241  *            DdeSetQualityOfService (USER32.@)
 242  */
 243
 244 BOOL WINAPI DdeSetQualityOfService(HWND hwndClient, CONST SECURITY_QUALITY_OF_SERVICE *pqosNew,
 245                                    PSECURITY_QUALITY_OF_SERVICE pqosPrev)
 246 {
 247      FIXME("(%p %p %p): stub\n", hwndClient, pqosNew, pqosPrev);
 248      return TRUE;
 249 }
 250
 251 /* ================================================================
 252  *
 253  *                      Instance management
 254  *
 255  * ================================================================ */
 256
 257 /******************************************************************************
 258  *              IncrementInstanceId
 259  *
 260  *      generic routine to increment the max instance Id and allocate a new application instance
 261  */
 262 static void WDML_IncrementInstanceId(WDML_INSTANCE* pInstance)
 263 {
 264     DWORD       id = InterlockedIncrement(&WDML_MaxInstanceID);
 265
 266     pInstance->instanceID = id;
 267     TRACE("New instance id %ld allocated\n", id);
 268 }
 269
 270 /******************************************************************
 271  *              WDML_EventProc
 272  *
 273  *
 274  */
 275 static LRESULT CALLBACK WDML_EventProc(HWND hwndEvent, UINT uMsg, WPARAM wParam, LPARAM lParam)
 276 {
 277     WDML_INSTANCE*      pInstance;
 278     HSZ                 hsz1, hsz2;
 279
 280     switch (uMsg)
 281     {
 282     case WM_WDML_REGISTER:
 283         pInstance = WDML_GetInstanceFromWnd(hwndEvent);
 284         /* try calling the Callback */
 285         if (pInstance && !(pInstance->CBFflags & CBF_SKIP_REGISTRATIONS))
 286         {
 287             hsz1 = WDML_MakeHszFromAtom(pInstance, wParam);
 288             hsz2 = WDML_MakeHszFromAtom(pInstance, lParam);
 289             WDML_InvokeCallback(pInstance, XTYP_REGISTER, 0, 0, hsz1, hsz2, 0, 0, 0);
 290             WDML_DecHSZ(pInstance, hsz1);
 291             WDML_DecHSZ(pInstance, hsz2);
 292         }
 293         break;
 294
 295     case WM_WDML_UNREGISTER:
 296         pInstance = WDML_GetInstanceFromWnd(hwndEvent);
 297         if (pInstance && !(pInstance->CBFflags & CBF_SKIP_UNREGISTRATIONS))
 298         {
 299             hsz1 = WDML_MakeHszFromAtom(pInstance, wParam);
 300             hsz2 = WDML_MakeHszFromAtom(pInstance, lParam);
 301             WDML_InvokeCallback(pInstance, XTYP_UNREGISTER, 0, 0, hsz1, hsz2, 0, 0, 0);
 302             WDML_DecHSZ(pInstance, hsz1);
 303             WDML_DecHSZ(pInstance, hsz2);
 304         }
 305         break;
 306
 307     case WM_WDML_CONNECT_CONFIRM:
 308         pInstance = WDML_GetInstanceFromWnd(hwndEvent);
 309         if (pInstance && !(pInstance->CBFflags & CBF_SKIP_CONNECT_CONFIRMS))
 310         {
 311             WDML_CONV*  pConv;
 312             /* confirm connection...
 313              * lookup for this conv handle
 314              */
 315             HWND client = WIN_GetFullHandle( (HWND)wParam );
 316             HWND server = WIN_GetFullHandle( (HWND)lParam );
 317             for (pConv = pInstance->convs[WDML_SERVER_SIDE]; pConv != NULL; pConv = pConv->next)
 318             {
 319                 if (pConv->hwndClient == client && pConv->hwndServer == server)
 320                     break;
 321             }
 322             if (pConv)
 323             {
 324                 pConv->wStatus |= ST_ISLOCAL;
 325
 326                 WDML_InvokeCallback(pInstance, XTYP_CONNECT_CONFIRM, 0, (HCONV)pConv,
 327                                     pConv->hszTopic, pConv->hszService, 0, 0,
 328                                     (pConv->wStatus & ST_ISSELF) ? 1 : 0);
 329             }
 330         }
 331         break;
 332     default:
 333         return DefWindowProcA(hwndEvent, uMsg, wParam, lParam);
 334     }
 335     return 0;
 336 }
 337
 338 /******************************************************************
 339  *              WDML_Initialize
 340  *
 341  *
 342  */
 343 UINT WDML_Initialize(LPDWORD pidInst, PFNCALLBACK pfnCallback,
 344                      DWORD afCmd, DWORD ulRes, BOOL bUnicode, BOOL b16)
 345 {
 346     WDML_INSTANCE*              pInstance;
 347     WDML_INSTANCE*              reference_inst;
 348     UINT                        ret;
 349     WNDCLASSEXA                 wndclass;
 350
 351     TRACE("(%p,%p,0x%lx,%ld)\n",
 352           pidInst, pfnCallback, afCmd, ulRes);
 353
 354     if (ulRes)
 355     {
 356         ERR("Reserved value not zero?  What does this mean?\n");
 357         /* trap this and no more until we know more */
 358         return DMLERR_NO_ERROR;
 359     }
 360
 361     /* grab enough heap for one control struct - not really necessary for re-initialise
 362      *  but allows us to use same validation routines */
 363     pInstance = (WDML_INSTANCE*)HeapAlloc(GetProcessHeap(), 0, sizeof(WDML_INSTANCE));
 364     if (pInstance == NULL)
 365     {
 366         /* catastrophe !! warn user & abort */
 367         ERR("Instance create failed - out of memory\n");
 368         return DMLERR_SYS_ERROR;
 369     }
 370     pInstance->next = NULL;
 371     pInstance->monitor = (afCmd | APPCLASS_MONITOR);
 372
 373     /* messy bit, spec implies that 'Client Only' can be set in 2 different ways, catch 1 here */
 374
 375     pInstance->clientOnly = afCmd & APPCMD_CLIENTONLY;
 376     pInstance->instanceID = *pidInst; /* May need to add calling proc Id */
 377     pInstance->threadID = GetCurrentThreadId();
 378     pInstance->callback = *pfnCallback;
 379     pInstance->unicode = bUnicode;
 380     pInstance->win16 = b16;
 381     pInstance->nodeList = NULL; /* node will be added later */
 382     pInstance->monitorFlags = afCmd & MF_MASK;
 383     pInstance->servers = NULL;
 384     pInstance->convs[0] = NULL;
 385     pInstance->convs[1] = NULL;
 386     pInstance->links[0] = NULL;
 387     pInstance->links[1] = NULL;
 388
 389     /* isolate CBF flags in one go, expect this will go the way of all attempts to be clever !! */
 390
 391     pInstance->CBFflags = afCmd^((afCmd&MF_MASK)|((afCmd&APPCMD_MASK)|(afCmd&APPCLASS_MASK)));
 392
 393     if (!pInstance->clientOnly)
 394     {
 395         /* Check for other way of setting Client-only !! */
 396         pInstance->clientOnly =
 397             (pInstance->CBFflags & CBF_FAIL_ALLSVRXACTIONS) == CBF_FAIL_ALLSVRXACTIONS;
 398     }
 399
 400     TRACE("instance created - checking validity \n");
 401
 402     if (*pidInst == 0)
 403     {
 404         /*  Initialisation of new Instance Identifier */
 405         TRACE("new instance, callback %p flags %lX\n",pfnCallback,afCmd);
 406
 407         EnterCriticalSection(&WDML_CritSect);
 408
 409         if (WDML_InstanceList == NULL)
 410         {
 411             /* can't be another instance in this case, assign to the base pointer */
 412             WDML_InstanceList = pInstance;
 413
 414             /* since first must force filter of XTYP_CONNECT and XTYP_WILDCONNECT for
 415              *          present
 416              *  -------------------------------      NOTE NOTE NOTE    --------------------------
 417              *
 418              *  the manual is not clear if this condition
 419              *  applies to the first call to DdeInitialize from an application, or the
 420              *  first call for a given callback !!!
 421              */
 422
 423             pInstance->CBFflags = pInstance->CBFflags|APPCMD_FILTERINITS;
 424             TRACE("First application instance detected OK\n");
 425             /*  allocate new instance ID */
 426             WDML_IncrementInstanceId(pInstance);
 427         }
 428         else
 429         {
 430             /* really need to chain the new one in to the latest here, but after checking conditions
 431              *  such as trying to start a conversation from an application trying to monitor */
 432             reference_inst = WDML_InstanceList;
 433             TRACE("Subsequent application instance - starting checks\n");
 434             while (reference_inst->next != NULL)
 435             {
 436                 /*
 437                  *      This set of tests will work if application uses same instance Id
 438                  *      at application level once allocated - which is what manual implies
 439                  *      should happen. If someone tries to be
 440                  *      clever (lazy ?) it will fail to pick up that later calls are for
 441                  *      the same application - should we trust them ?
 442                  */
 443                 if (pInstance->instanceID == reference_inst->instanceID)
 444                 {
 445                     /* Check 1 - must be same Client-only state */
 446
 447                     if (pInstance->clientOnly != reference_inst->clientOnly)
 448                     {
 449                         ret = DMLERR_DLL_USAGE;
 450                         goto theError;
 451                     }
 452
 453                     /* Check 2 - cannot use 'Monitor' with any non-monitor modes */
 454
 455                     if (pInstance->monitor != reference_inst->monitor)
 456                     {
 457                         ret = DMLERR_INVALIDPARAMETER;
 458                         goto theError;
 459                     }
 460
 461                     /* Check 3 - must supply different callback address */
 462
 463                     if (pInstance->callback == reference_inst->callback)
 464                     {
 465                         ret = DMLERR_DLL_USAGE;
 466                         goto theError;
 467                     }
 468                 }
 469                 reference_inst = reference_inst->next;
 470             }
 471             /*  All cleared, add to chain */
 472
 473             TRACE("Application Instance checks finished\n");
 474             WDML_IncrementInstanceId(pInstance);
 475             reference_inst->next = pInstance;
 476         }
 477         LeaveCriticalSection(&WDML_CritSect);
 478
 479         *pidInst = pInstance->instanceID;
 480
 481         /* for deadlock issues, windows must always be created when outside the critical section */
 482         wndclass.cbSize        = sizeof(wndclass);
 483         wndclass.style         = 0;
 484         wndclass.lpfnWndProc   = WDML_EventProc;
 485         wndclass.cbClsExtra    = 0;
 486         wndclass.cbWndExtra    = sizeof(DWORD);
 487         wndclass.hInstance     = 0;
 488         wndclass.hIcon         = 0;
 489         wndclass.hCursor       = 0;
 490         wndclass.hbrBackground = 0;
 491         wndclass.lpszMenuName  = NULL;
 492         wndclass.lpszClassName = WDML_szEventClass;
 493         wndclass.hIconSm       = 0;
 494
 495         RegisterClassExA(&wndclass);
 496
 497         pInstance->hwndEvent = CreateWindowA(WDML_szEventClass, NULL,
 498                                                 WS_POPUP, 0, 0, 0, 0,
 499                                                 0, 0, 0, 0);
 500
 501         SetWindowLongA(pInstance->hwndEvent, GWL_WDML_INSTANCE, (DWORD)pInstance);
 502
 503         TRACE("New application instance processing finished OK\n");
 504     }
 505     else
 506     {
 507         /* Reinitialisation situation   --- FIX  */
 508         TRACE("reinitialisation of (%p,%p,0x%lx,%ld): stub\n", pidInst, pfnCallback, afCmd, ulRes);
 509
 510         EnterCriticalSection(&WDML_CritSect);
 511
 512         if (WDML_InstanceList == NULL)
 513         {
 514             ret = DMLERR_INVALIDPARAMETER;
 515             goto theError;
 516         }
 517         HeapFree(GetProcessHeap(), 0, pInstance); /* finished - release heap space used as work store */
 518         /* can't reinitialise if we have initialised nothing !! */
 519         reference_inst = WDML_InstanceList;
 520         /* must first check if we have been given a valid instance to re-initialise !!  how do we do that ? */
 521         /*
 522          *      MS allows initialisation without specifying a callback, should we allow addition of the
 523          *      callback by a later call to initialise ? - if so this lot will have to change
 524          */
 525         while (reference_inst->next != NULL)
 526         {
 527             if (*pidInst == reference_inst->instanceID && pfnCallback == reference_inst->callback)
 528             {
 529                 /* Check 1 - cannot change client-only mode if set via APPCMD_CLIENTONLY */
 530
 531                 if (reference_inst->clientOnly)
 532                 {
 533                     if  ((reference_inst->CBFflags & CBF_FAIL_ALLSVRXACTIONS) != CBF_FAIL_ALLSVRXACTIONS)
 534                     {
 535                                 /* i.e. Was set to Client-only and through APPCMD_CLIENTONLY */
 536
 537                         if (!(afCmd & APPCMD_CLIENTONLY))
 538                         {
 539                             ret = DMLERR_INVALIDPARAMETER;
 540                             goto theError;
 541                         }
 542                     }
 543                 }
 544                 /* Check 2 - cannot change monitor modes */
 545
 546                 if (pInstance->monitor != reference_inst->monitor)
 547                 {
 548                     ret = DMLERR_INVALIDPARAMETER;
 549                     goto theError;
 550                 }
 551
 552                 /* Check 3 - trying to set Client-only via APPCMD when not set so previously */
 553
 554                 if ((afCmd&APPCMD_CLIENTONLY) && !reference_inst->clientOnly)
 555                 {
 556                     ret = DMLERR_INVALIDPARAMETER;
 557                     goto theError;
 558                 }
 559                 break;
 560             }
 561             reference_inst = reference_inst->next;
 562         }
 563         if (reference_inst->next == NULL)
 564         {
 565             ret = DMLERR_INVALIDPARAMETER;
 566             goto theError;
 567         }
 568         /* All checked - change relevant flags */
 569
 570         reference_inst->CBFflags = pInstance->CBFflags;
 571         reference_inst->clientOnly = pInstance->clientOnly;
 572         reference_inst->monitorFlags = pInstance->monitorFlags;
 573         LeaveCriticalSection(&WDML_CritSect);
 574     }
 575
 576     return DMLERR_NO_ERROR;
 577  theError:
 578     HeapFree(GetProcessHeap(), 0, pInstance);
 579     LeaveCriticalSection(&WDML_CritSect);
 580     return ret;
 581 }
 582
 583 /******************************************************************************
 584  *            DdeInitializeA   (USER32.@)
 585  */
 586 UINT WINAPI DdeInitializeA(LPDWORD pidInst, PFNCALLBACK pfnCallback,
 587                            DWORD afCmd, DWORD ulRes)
 588 {
 589     return WDML_Initialize(pidInst, pfnCallback, afCmd, ulRes, FALSE, FALSE);
 590 }
 591
 592 /******************************************************************************
 593  * DdeInitializeW [USER32.@]
 594  * Registers an application with the DDEML
 595  *
 596  * PARAMS
 597  *    pidInst     [I] Pointer to instance identifier
 598  *    pfnCallback [I] Pointer to callback function
 599  *    afCmd       [I] Set of command and filter flags
 600  *    ulRes       [I] Reserved
 601  *
 602  * RETURNS
 603  *    Success: DMLERR_NO_ERROR
 604  *    Failure: DMLERR_DLL_USAGE, DMLERR_INVALIDPARAMETER, DMLERR_SYS_ERROR
 605  */
 606 UINT WINAPI DdeInitializeW(LPDWORD pidInst, PFNCALLBACK pfnCallback,
 607                            DWORD afCmd, DWORD ulRes)
 608 {
 609     return WDML_Initialize(pidInst, pfnCallback, afCmd, ulRes, TRUE, FALSE);
 610 }
 611
 612 /*****************************************************************
 613  * DdeUninitialize [USER32.@]  Frees DDEML resources
 614  *
 615  * PARAMS
 616  *    idInst [I] Instance identifier
 617  *
 618  * RETURNS
 619  *    Success: TRUE
 620  *    Failure: FALSE
 621  */
 622
 623 BOOL WINAPI DdeUninitialize(DWORD idInst)
 624 {
 625     /*  Stage one - check if we have a handle for this instance
 626      */
 627     WDML_INSTANCE*              pInstance;
 628     WDML_CONV*                  pConv;
 629     WDML_CONV*                  pConvNext;
 630
 631     TRACE("(%ld)\n", idInst);
 632
 633     EnterCriticalSection(&WDML_CritSect);
 634
 635     /*  First check instance
 636      */
 637     pInstance = WDML_GetInstance(idInst);
 638     if (pInstance == NULL)
 639     {
 640         LeaveCriticalSection(&WDML_CritSect);
 641         /*
 642          *      Needs something here to record NOT_INITIALIZED ready for DdeGetLastError
 643          */
 644         return FALSE;
 645     }
 646
 647     /* first terminate all conversations client side
 648      * this shall close existing links...
 649      */
 650     for (pConv = pInstance->convs[WDML_CLIENT_SIDE]; pConv != NULL; pConv = pConvNext)
 651     {
 652         pConvNext = pConv->next;
 653         DdeDisconnect((HCONV)pConv);
 654     }
 655     if (pInstance->convs[WDML_CLIENT_SIDE])
 656         FIXME("still pending conversations\n");
 657
 658     /* then unregister all known service names */
 659     DdeNameService(idInst, 0, 0, DNS_UNREGISTER);
 660
 661     /* Free the nodes that were not freed by this instance
 662      * and remove the nodes from the list of HSZ nodes.
 663      */
 664     WDML_FreeAllHSZ(pInstance);
 665
 666     DestroyWindow(pInstance->hwndEvent);
 667
 668     /* OK now delete the instance handle itself */
 669
 670     if (WDML_InstanceList == pInstance)
 671     {
 672         /* special case - the first/only entry */
 673         WDML_InstanceList = pInstance->next;
 674     }
 675     else
 676     {
 677         /* general case, remove entry */
 678         WDML_INSTANCE*  inst;
 679
 680         for (inst = WDML_InstanceList; inst->next != pInstance; inst = inst->next);
 681         inst->next = pInstance->next;
 682     }
 683     /* leave crit sect and release the heap entry
 684      */
 685     HeapFree(GetProcessHeap(), 0, pInstance);
 686     LeaveCriticalSection(&WDML_CritSect);
 687     return TRUE;
 688 }
 689
 690 /******************************************************************
 691  *              WDML_NotifyThreadExit
 692  *
 693  *
 694  */
 695 void WDML_NotifyThreadDetach(void)
 696 {
 697     WDML_INSTANCE*      pInstance;
 698     WDML_INSTANCE*      next;
 699     DWORD               tid = GetCurrentThreadId();
 700
 701     EnterCriticalSection(&WDML_CritSect);
 702     for (pInstance = WDML_InstanceList; pInstance != NULL; pInstance = next)
 703     {
 704         next = pInstance->next;
 705         if (pInstance->threadID == tid)
 706         {
 707             DdeUninitialize(pInstance->instanceID);
 708         }
 709     }
 710     LeaveCriticalSection(&WDML_CritSect);
 711 }
 712
 713 /******************************************************************
 714  *              WDML_InvokeCallback
 715  *
 716  *
 717  */
 718 HDDEDATA        WDML_InvokeCallback(WDML_INSTANCE* pInstance, UINT uType, UINT uFmt, HCONV hConv,
 719                                     HSZ hsz1, HSZ hsz2, HDDEDATA hdata,
 720                                     ULONG_PTR dwData1, ULONG_PTR dwData2)
 721 {
 722     HDDEDATA    ret;
 723
 724     if (pInstance == NULL)
 725         return NULL;
 726     TRACE("invoking CB%d[%p] (%x %x %p %p %p %p %lx %lx)\n",
 727           pInstance->win16 ? 16 : 32, pInstance->callback, uType, uFmt,
 728           hConv, hsz1, hsz2, hdata, dwData1, dwData2);
 729     if (pInstance->win16)
 730     {
 731         ret = WDML_InvokeCallback16(pInstance->callback, uType, uFmt, hConv,
 732                                     hsz1, hsz2, hdata, dwData1, dwData2);
 733     }
 734     else
 735     {
 736         ret = pInstance->callback(uType, uFmt, hConv, hsz1, hsz2, hdata, dwData1, dwData2);
 737     }
 738     TRACE("done => %p\n", ret);
 739     return ret;
 740 }
 741
 742 /*****************************************************************************
 743  *      WDML_GetInstance
 744  *
 745  *      generic routine to return a pointer to the relevant DDE_HANDLE_ENTRY
 746  *      for an instance Id, or NULL if the entry does not exist
 747  *
 748  */
 749 WDML_INSTANCE*  WDML_GetInstance(DWORD instId)
 750 {
 751     WDML_INSTANCE*      pInstance;
 752
 753     for (pInstance = WDML_InstanceList; pInstance != NULL; pInstance = pInstance->next)
 754     {
 755         if (pInstance->instanceID == instId)
 756         {
 757             if (GetCurrentThreadId() != pInstance->threadID)
 758             {
 759                 FIXME("Tried to get instance from wrong thread\n");
 760                 continue;
 761             }
 762             return pInstance;
 763         }
 764     }
 765     TRACE("Instance entry missing\n");
 766     return NULL;
 767 }
 768
 769 /******************************************************************
 770  *              WDML_GetInstanceFromWnd
 771  *
 772  *
 773  */
 774 WDML_INSTANCE*  WDML_GetInstanceFromWnd(HWND hWnd)
 775 {
 776     return (WDML_INSTANCE*)GetWindowLongA(hWnd, GWL_WDML_INSTANCE);
 777 }
 778
 779 /******************************************************************************
 780  * DdeGetLastError [USER32.@]  Gets most recent error code
 781  *
 782  * PARAMS
 783  *    idInst [I] Instance identifier
 784  *
 785  * RETURNS
 786  *    Last error code
 787  */
 788 UINT WINAPI DdeGetLastError(DWORD idInst)
 789 {
 790     DWORD               error_code;
 791     WDML_INSTANCE*      pInstance;
 792
 793     EnterCriticalSection(&WDML_CritSect);
 794
 795     /*  First check instance
 796      */
 797     pInstance = WDML_GetInstance(idInst);
 798     if  (pInstance == NULL)
 799     {
 800         error_code = DMLERR_INVALIDPARAMETER;
 801     }
 802     else
 803     {
 804         error_code = pInstance->lastError;
 805         pInstance->lastError = 0;
 806     }
 807
 808     LeaveCriticalSection(&WDML_CritSect);
 809     return error_code;
 810 }
 811
 812 /* ================================================================
 813  *
 814  *                      String management
 815  *
 816  * ================================================================ */
 817
 818
 819 /******************************************************************
 820  *              WDML_FindNode
 821  *
 822  *
 823  */
 824 static HSZNode* WDML_FindNode(WDML_INSTANCE* pInstance, HSZ hsz)
 825 {
 826     HSZNode*    pNode;
 827
 828     if (pInstance == NULL) return NULL;
 829
 830     for (pNode = pInstance->nodeList; pNode != NULL; pNode = pNode->next)
 831     {
 832         if (pNode->hsz == hsz) break;
 833     }
 834     if (!pNode) WARN("HSZ %p not found\n", hsz);
 835     return pNode;
 836 }
 837
 838 /******************************************************************
 839  *              WDML_MakeAtomFromHsz
 840  *
 841  * Creates a global atom from an existing HSZ
 842  * Generally used before sending an HSZ as an atom to a remote app
 843  */
 844 ATOM    WDML_MakeAtomFromHsz(HSZ hsz)
 845 {
 846     WCHAR nameBuffer[MAX_BUFFER_LEN];
 847
 848     if (GetAtomNameW(HSZ2ATOM(hsz), nameBuffer, MAX_BUFFER_LEN))
 849         return GlobalAddAtomW(nameBuffer);
 850     WARN("HSZ %p not found\n", hsz);
 851     return 0;
 852 }
 853
 854 /******************************************************************
 855  *              WDML_MakeHszFromAtom
 856  *
 857  * Creates a HSZ from an existing global atom
 858  * Generally used while receiving a global atom and transforming it
 859  * into an HSZ
 860  */
 861 HSZ     WDML_MakeHszFromAtom(WDML_INSTANCE* pInstance, ATOM atom)
 862 {
 863     WCHAR nameBuffer[MAX_BUFFER_LEN];
 864
 865     if (!atom) return NULL;
 866
 867     if (GlobalGetAtomNameW(atom, nameBuffer, MAX_BUFFER_LEN))
 868     {
 869         TRACE("%x => %s\n", atom, debugstr_w(nameBuffer));
 870         return DdeCreateStringHandleW(pInstance->instanceID, nameBuffer, CP_WINUNICODE);
 871     }
 872     WARN("ATOM 0x%x not found\n", atom);
 873     return 0;
 874 }
 875
 876 /******************************************************************
 877  *              WDML_IncHSZ
 878  *
 879  *
 880  */
 881 BOOL WDML_IncHSZ(WDML_INSTANCE* pInstance, HSZ hsz)
 882 {
 883     HSZNode*    pNode;
 884
 885     pNode = WDML_FindNode(pInstance, hsz);
 886     if (!pNode) return FALSE;
 887
 888     pNode->refCount++;
 889     return TRUE;
 890 }
 891
 892 /******************************************************************************
 893  *           WDML_DecHSZ    (INTERNAL)
 894  *
 895  * Decrease the ref count of an HSZ. If it reaches 0, the node is removed from the list
 896  * of HSZ nodes
 897  * Returns -1 is the HSZ isn't found, otherwise it's the current (after --) of the ref count
 898  */
 899 BOOL WDML_DecHSZ(WDML_INSTANCE* pInstance, HSZ hsz)
 900 {
 901     HSZNode*    pPrev = NULL;
 902     HSZNode*    pCurrent;
 903
 904     for (pCurrent = pInstance->nodeList; pCurrent != NULL; pCurrent = (pPrev = pCurrent)->next)
 905     {
 906         /* If we found the node we were looking for and its ref count is one,
 907          * we can remove it
 908          */
 909         if (pCurrent->hsz == hsz)
 910         {
 911             if (--pCurrent->refCount == 0)
 912             {
 913                 if (pCurrent == pInstance->nodeList)
 914                 {
 915                     pInstance->nodeList = pCurrent->next;
 916                 }
 917                 else
 918                 {
 919                     pPrev->next = pCurrent->next;
 920                 }
 921                 HeapFree(GetProcessHeap(), 0, pCurrent);
 922                 DeleteAtom(HSZ2ATOM(hsz));
 923             }
 924             return TRUE;
 925         }
 926     }
 927     WARN("HSZ %p not found\n", hsz);
 928
 929     return FALSE;
 930 }
 931
 932 /******************************************************************************
 933  *            WDML_FreeAllHSZ    (INTERNAL)
 934  *
 935  * Frees up all the strings still allocated in the list and
 936  * remove all the nodes from the list of HSZ nodes.
 937  */
 938 void WDML_FreeAllHSZ(WDML_INSTANCE* pInstance)
 939 {
 940     /* Free any strings created in this instance.
 941      */
 942     while (pInstance->nodeList != NULL)
 943     {
 944         DdeFreeStringHandle(pInstance->instanceID, pInstance->nodeList->hsz);
 945     }
 946 }
 947
 948 /******************************************************************************
 949  *            InsertHSZNode    (INTERNAL)
 950  *
 951  * Insert a node to the head of the list.
 952  */
 953 static void WDML_InsertHSZNode(WDML_INSTANCE* pInstance, HSZ hsz)
 954 {
 955     if (hsz != 0)
 956     {
 957         HSZNode* pNew = NULL;
 958         /* Create a new node for this HSZ.
 959          */
 960         pNew = (HSZNode*)HeapAlloc(GetProcessHeap(), 0, sizeof(HSZNode));
 961         if (pNew != NULL)
 962         {
 963             pNew->hsz      = hsz;
 964             pNew->next     = pInstance->nodeList;
 965             pNew->refCount = 1;
 966             pInstance->nodeList = pNew;
 967         }
 968         else
 969         {
 970             ERR("Primary HSZ Node allocation failed - out of memory\n");
 971         }
 972     }
 973 }
 974
 975 /******************************************************************
 976  *              WDML_QueryString
 977  *
 978  *
 979  */
 980 static int      WDML_QueryString(WDML_INSTANCE* pInstance, HSZ hsz, LPVOID ptr, DWORD cchMax,
 981                                  int codepage)
 982 {
 983     WCHAR       pString[MAX_BUFFER_LEN];
 984     int         ret;
 985     /* If psz is null, we have to return only the length
 986      * of the string.
 987      */
 988     if (ptr == NULL)
 989     {
 990         ptr = pString;
 991         cchMax = MAX_BUFFER_LEN;
 992     }
 993
 994     switch (codepage)
 995     {
 996     case CP_WINANSI:
 997         ret = GetAtomNameA(HSZ2ATOM(hsz), ptr, cchMax);
 998         break;
 999     case CP_WINUNICODE:
1000         ret = GetAtomNameW(HSZ2ATOM(hsz), ptr, cchMax);
1001         break;
1002     default:
1003         ERR("Unknown code page %d\n", codepage);
1004         ret = 0;
1005     }
1006     return ret;
1007 }
1008
1009 /*****************************************************************
1010  * DdeQueryStringA [USER32.@]
1011  */
1012 DWORD WINAPI DdeQueryStringA(DWORD idInst, HSZ hsz, LPSTR psz, DWORD cchMax, INT iCodePage)
1013 {
1014     DWORD               ret = 0;
1015     WDML_INSTANCE*      pInstance;
1016
1017     TRACE("(%ld, %p, %p, %ld, %d)\n", idInst, hsz, psz, cchMax, iCodePage);
1018
1019     EnterCriticalSection(&WDML_CritSect);
1020
1021     /*  First check instance
1022      */
1023     pInstance = WDML_GetInstance(idInst);
1024     if (pInstance != NULL)
1025     {
1026         if (iCodePage == 0) iCodePage = CP_WINANSI;
1027         ret = WDML_QueryString(pInstance, hsz, psz, cchMax, iCodePage);
1028     }
1029     LeaveCriticalSection(&WDML_CritSect);
1030
1031     TRACE("returning %ld (%s)\n", ret, debugstr_a(psz));
1032     return ret;
1033 }
1034
1035 /*****************************************************************
1036  * DdeQueryStringW [USER32.@]
1037  */
1038
1039 DWORD WINAPI DdeQueryStringW(DWORD idInst, HSZ hsz, LPWSTR psz, DWORD cchMax, INT iCodePage)
1040 {
1041     DWORD               ret = 0;
1042     WDML_INSTANCE*      pInstance;
1043
1044     TRACE("(%ld, %p, %p, %ld, %d)\n", idInst, hsz, psz, cchMax, iCodePage);
1045
1046     EnterCriticalSection(&WDML_CritSect);
1047
1048     /*  First check instance
1049      */
1050     pInstance = WDML_GetInstance(idInst);
1051     if (pInstance != NULL)
1052     {
1053         if (iCodePage == 0) iCodePage = CP_WINUNICODE;
1054         ret = WDML_QueryString(pInstance, hsz, psz, cchMax, iCodePage);
1055     }
1056     LeaveCriticalSection(&WDML_CritSect);
1057
1058     TRACE("returning %ld (%s)\n", ret, debugstr_w(psz));
1059     return ret;
1060 }
1061
1062 /******************************************************************
1063  *              DML_CreateString
1064  *
1065  *
1066  */
1067 static  HSZ     WDML_CreateString(WDML_INSTANCE* pInstance, LPCVOID ptr, int codepage)
1068 {
1069     HSZ         hsz;
1070
1071     switch (codepage)
1072     {
1073     case CP_WINANSI:
1074         hsz = ATOM2HSZ(AddAtomA(ptr));
1075         TRACE("added atom %s with HSZ %p, \n", debugstr_a(ptr), hsz);
1076         break;
1077     case CP_WINUNICODE:
1078         hsz = ATOM2HSZ(AddAtomW(ptr));
1079         TRACE("added atom %s with HSZ %p, \n", debugstr_w(ptr), hsz);
1080         break;
1081     default:
1082         ERR("Unknown code page %d\n", codepage);
1083         return 0;
1084     }
1085     WDML_InsertHSZNode(pInstance, hsz);
1086     return hsz;
1087 }
1088
1089 /*****************************************************************
1090  * DdeCreateStringHandleA [USER32.@]
1091  *
1092  * RETURNS
1093  *    Success: String handle
1094  *    Failure: 0
1095  */
1096 HSZ WINAPI DdeCreateStringHandleA(DWORD idInst, LPCSTR psz, INT codepage)
1097 {
1098     HSZ                 hsz = 0;
1099     WDML_INSTANCE*      pInstance;
1100
1101     TRACE("(%ld,%s,%d)\n", idInst, debugstr_a(psz), codepage);
1102
1103     EnterCriticalSection(&WDML_CritSect);
1104
1105     pInstance = WDML_GetInstance(idInst);
1106     if (pInstance)
1107     {
1108         if (codepage == 0) codepage = CP_WINANSI;
1109         hsz = WDML_CreateString(pInstance, psz, codepage);
1110     }
1111
1112     LeaveCriticalSection(&WDML_CritSect);
1113     return hsz;
1114 }
1115
1116
1117 /******************************************************************************
1118  * DdeCreateStringHandleW [USER32.@]  Creates handle to identify string
1119  *
1120  * PARAMS
1121  *      idInst   [I] Instance identifier
1122  *      psz      [I] Pointer to string
1123  *      codepage [I] Code page identifier
1124  * RETURNS
1125  *    Success: String handle
1126  *    Failure: 0
1127  */
1128 HSZ WINAPI DdeCreateStringHandleW(DWORD idInst, LPCWSTR psz, INT codepage)
1129 {
1130     WDML_INSTANCE*      pInstance;
1131     HSZ                 hsz = 0;
1132
1133     TRACE("(%ld,%s,%d)\n", idInst, debugstr_w(psz), codepage);
1134
1135     EnterCriticalSection(&WDML_CritSect);
1136
1137     pInstance = WDML_GetInstance(idInst);
1138     if (pInstance)
1139     {
1140         if (codepage == 0) codepage = CP_WINUNICODE;
1141         hsz = WDML_CreateString(pInstance, psz, codepage);
1142     }
1143     LeaveCriticalSection(&WDML_CritSect);
1144
1145     return hsz;
1146 }
1147
1148 /*****************************************************************
1149  *            DdeFreeStringHandle   (USER32.@)
1150  * RETURNS: success: nonzero
1151  *          fail:    zero
1152  */
1153 BOOL WINAPI DdeFreeStringHandle(DWORD idInst, HSZ hsz)
1154 {
1155     WDML_INSTANCE*      pInstance;
1156     BOOL                ret = FALSE;
1157
1158     TRACE("(%ld,%p): \n", idInst, hsz);
1159
1160     EnterCriticalSection(&WDML_CritSect);
1161
1162     /*  First check instance
1163      */
1164     pInstance = WDML_GetInstance(idInst);
1165     if (pInstance)
1166         ret = WDML_DecHSZ(pInstance, hsz);
1167
1168     LeaveCriticalSection(&WDML_CritSect);
1169
1170     return ret;
1171 }
1172
1173 /*****************************************************************
1174  *            DdeKeepStringHandle  (USER32.@)
1175  *
1176  * RETURNS: success: nonzero
1177  *          fail:    zero
1178  */
1179 BOOL WINAPI DdeKeepStringHandle(DWORD idInst, HSZ hsz)
1180 {
1181     WDML_INSTANCE*      pInstance;
1182     BOOL                ret = FALSE;
1183
1184     TRACE("(%ld,%p): \n", idInst, hsz);
1185
1186     EnterCriticalSection(&WDML_CritSect);
1187
1188     /*  First check instance
1189      */
1190     pInstance = WDML_GetInstance(idInst);
1191     if (pInstance)
1192         ret = WDML_IncHSZ(pInstance, hsz);
1193
1194     LeaveCriticalSection(&WDML_CritSect);
1195     return ret;
1196 }
1197
1198 /*****************************************************************
1199  *            DdeCmpStringHandles (USER32.@)
1200  *
1201  * Compares the value of two string handles.  This comparison is
1202  * not case sensitive.
1203  *
1204  * Returns:
1205  * -1 The value of hsz1 is zero or less than hsz2
1206  * 0  The values of hsz 1 and 2 are the same or both zero.
1207  * 1  The value of hsz2 is zero of less than hsz1
1208  */
1209 INT WINAPI DdeCmpStringHandles(HSZ hsz1, HSZ hsz2)
1210 {
1211     WCHAR       psz1[MAX_BUFFER_LEN];
1212     WCHAR       psz2[MAX_BUFFER_LEN];
1213     int         ret = 0;
1214     int         ret1, ret2;
1215
1216     ret1 = GetAtomNameW(HSZ2ATOM(hsz1), psz1, MAX_BUFFER_LEN);
1217     ret2 = GetAtomNameW(HSZ2ATOM(hsz2), psz2, MAX_BUFFER_LEN);
1218
1219     TRACE("(%p<%s> %p<%s>);\n", hsz1, debugstr_w(psz1), hsz2, debugstr_w(psz2));
1220
1221     /* Make sure we found both strings. */
1222     if (ret1 == 0 && ret2 == 0)
1223     {
1224         /* If both are not found, return both  "zero strings". */
1225         ret = 0;
1226     }
1227     else if (ret1 == 0)
1228     {
1229         /* If hsz1 is a not found, return hsz1 is "zero string". */
1230         ret = -1;
1231     }
1232     else if (ret2 == 0)
1233     {
1234         /* If hsz2 is a not found, return hsz2 is "zero string". */
1235         ret = 1;
1236     }
1237     else
1238     {
1239         /* Compare the two strings we got (case insensitive). */
1240         ret = lstrcmpiW(psz1, psz2);
1241         /* Since strcmp returns any number smaller than
1242          * 0 when the first string is found to be less than
1243          * the second one we must make sure we are returning
1244          * the proper values.
1245          */
1246         if (ret < 0)
1247         {
1248             ret = -1;
1249         }
1250         else if (ret > 0)
1251         {
1252             ret = 1;
1253         }
1254     }
1255
1256     return ret;
1257 }
1258
1259 /* ================================================================
1260  *
1261  *                      Data handle management
1262  *
1263  * ================================================================ */
1264
1265 /*****************************************************************
1266  *            DdeCreateDataHandle (USER32.@)
1267  */
1268 HDDEDATA WINAPI DdeCreateDataHandle(DWORD idInst, LPBYTE pSrc, DWORD cb, DWORD cbOff,
1269                                     HSZ hszItem, UINT wFmt, UINT afCmd)
1270 {
1271     /* For now, we ignore idInst, hszItem.
1272      * The purpose of these arguments still need to be investigated.
1273      */
1274
1275     HGLOBAL                     hMem;
1276     LPBYTE                      pByte;
1277     DDE_DATAHANDLE_HEAD*        pDdh;
1278     WCHAR psz[MAX_BUFFER_LEN];
1279
1280     if (!GetAtomNameW(HSZ2ATOM(hszItem), psz, MAX_BUFFER_LEN))
1281     {
1282         psz[0] = HSZ2ATOM(hszItem);
1283         psz[1] = 0;
1284     }
1285
1286     TRACE("(%ld,%p,cb %ld, cbOff %ld,%p <%s>,fmt %04x,%x)\n",
1287           idInst, pSrc, cb, cbOff, hszItem, debugstr_w(psz), wFmt, afCmd);
1288
1289     if (afCmd != 0 && afCmd != HDATA_APPOWNED)
1290         return 0;
1291
1292     /* we use the first 4 bytes to store the size */
1293     if (!(hMem = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, cb + cbOff + sizeof(DDE_DATAHANDLE_HEAD))))
1294     {
1295         ERR("GlobalAlloc failed\n");
1296         return 0;
1297     }
1298
1299     pDdh = (DDE_DATAHANDLE_HEAD*)GlobalLock(hMem);
1300     if (!pDdh)
1301     {
1302         GlobalFree(hMem);
1303         return 0;
1304     }
1305
1306     pDdh->cfFormat = wFmt;
1307     pDdh->bAppOwned = (afCmd == HDATA_APPOWNED);
1308
1309     pByte = (LPBYTE)(pDdh + 1);
1310     if (pSrc)
1311     {
1312         memcpy(pByte, pSrc + cbOff, cb);
1313     }
1314     GlobalUnlock(hMem);
1315
1316     TRACE("=> %p\n", hMem);
1317     return (HDDEDATA)hMem;
1318 }
1319
1320 /*****************************************************************
1321  *
1322  *            DdeAddData (USER32.@)
1323  */
1324 HDDEDATA WINAPI DdeAddData(HDDEDATA hData, LPBYTE pSrc, DWORD cb, DWORD cbOff)
1325 {
1326     DWORD       old_sz, new_sz;
1327     LPBYTE      pDst;
1328
1329     TRACE("(%p,%p,cb %ld, cbOff %ld)\n", hData, pSrc, cb, cbOff);
1330
1331     pDst = DdeAccessData(hData, &old_sz);
1332     if (!pDst) return 0;
1333
1334     new_sz = cb + cbOff;
1335     if (new_sz > old_sz)
1336     {
1337         DdeUnaccessData(hData);
1338         hData = GlobalReAlloc((HGLOBAL)hData, new_sz + sizeof(DDE_DATAHANDLE_HEAD),
1339                               GMEM_MOVEABLE | GMEM_DDESHARE);
1340         pDst = DdeAccessData(hData, &old_sz);
1341     }
1342
1343     if (!pDst) return 0;
1344
1345     memcpy(pDst + cbOff, pSrc, cb);
1346     DdeUnaccessData(hData);
1347     return hData;
1348 }
1349
1350 /******************************************************************************
1351  * DdeGetData [USER32.@]  Copies data from DDE object to local buffer
1352  *
1353  *
1354  * PARAMS
1355  * hData        [I] Handle to DDE object
1356  * pDst         [I] Pointer to destination buffer
1357  * cbMax        [I] Amount of data to copy
1358  * cbOff        [I] Offset to beginning of data
1359  *
1360  * RETURNS
1361  *    Size of memory object associated with handle
1362  */
1363 DWORD WINAPI DdeGetData(HDDEDATA hData, LPBYTE pDst, DWORD cbMax, DWORD cbOff)
1364 {
1365     DWORD   dwSize, dwRet;
1366     LPBYTE  pByte;
1367
1368     TRACE("(%p,%p,%ld,%ld)\n", hData, pDst, cbMax, cbOff);
1369
1370     pByte = DdeAccessData(hData, &dwSize);
1371
1372     if (pByte)
1373     {
1374         if (!pDst)
1375         {
1376             dwRet = dwSize;
1377         }
1378         else if (cbOff + cbMax < dwSize)
1379         {
1380             dwRet = cbMax;
1381         }
1382         else if (cbOff < dwSize)
1383         {
1384             dwRet = dwSize - cbOff;
1385         }
1386         else
1387         {
1388             dwRet = 0;
1389         }
1390         if (pDst && dwRet != 0)
1391         {
1392             memcpy(pDst, pByte + cbOff, dwRet);
1393         }
1394         DdeUnaccessData(hData);
1395     }
1396     else
1397     {
1398         dwRet = 0;
1399     }
1400     return dwRet;
1401 }
1402
1403 /*****************************************************************
1404  *            DdeAccessData (USER32.@)
1405  */
1406 LPBYTE WINAPI DdeAccessData(HDDEDATA hData, LPDWORD pcbDataSize)
1407 {
1408     HGLOBAL                     hMem = (HGLOBAL)hData;
1409     DDE_DATAHANDLE_HEAD*        pDdh;
1410
1411     TRACE("(%p,%p)\n", hData, pcbDataSize);
1412
1413     pDdh = (DDE_DATAHANDLE_HEAD*)GlobalLock(hMem);
1414     if (pDdh == NULL)
1415     {
1416         ERR("Failed on GlobalLock(%p)\n", hMem);
1417         return 0;
1418     }
1419
1420     if (pcbDataSize != NULL)
1421     {
1422         *pcbDataSize = GlobalSize(hMem) - sizeof(DDE_DATAHANDLE_HEAD);
1423     }
1424     TRACE("=> %p (%lu) fmt %04x\n", pDdh + 1, GlobalSize(hMem) - sizeof(DDE_DATAHANDLE_HEAD), pDdh->cfFormat);
1425     return (LPBYTE)(pDdh + 1);
1426 }
1427
1428 /*****************************************************************
1429  *            DdeUnaccessData (USER32.@)
1430  */
1431 BOOL WINAPI DdeUnaccessData(HDDEDATA hData)
1432 {
1433     HGLOBAL hMem = (HGLOBAL)hData;
1434
1435     TRACE("(%p)\n", hData);
1436
1437     GlobalUnlock(hMem);
1438
1439     return TRUE;
1440 }
1441
1442 /*****************************************************************
1443  *            DdeFreeDataHandle   (USER32.@)
1444  */
1445 BOOL WINAPI DdeFreeDataHandle(HDDEDATA hData)
1446 {
1447     TRACE("(%p)\n", hData);
1448     return GlobalFree((HGLOBAL)hData) == 0;
1449 }
1450
1451 /******************************************************************
1452  *              WDML_IsAppOwned
1453  *
1454  *
1455  */
1456 BOOL WDML_IsAppOwned(HDDEDATA hData)
1457 {
1458     DDE_DATAHANDLE_HEAD*        pDdh;
1459     BOOL                        ret = FALSE;
1460
1461     pDdh = (DDE_DATAHANDLE_HEAD*)GlobalLock((HGLOBAL)hData);
1462     if (pDdh != NULL)
1463     {
1464         ret = pDdh->bAppOwned;
1465         GlobalUnlock((HGLOBAL)hData);
1466     }
1467     return ret;
1468 }
1469
1470 /* ================================================================
1471  *
1472  *                  Global <=> Data handle management
1473  *
1474  * ================================================================ */
1475
1476 /* Note: we use a DDEDATA, but layout of DDEDATA, DDEADVISE and DDEPOKE structures is similar:
1477  *    offset      size
1478  *    (bytes)    (bits) comment
1479  *      0          16   bit fields for options (release, ackreq, response...)
1480  *      2          16   clipboard format
1481  *      4          ?    data to be used
1482  */
1483 HDDEDATA        WDML_Global2DataHandle(HGLOBAL hMem, WINE_DDEHEAD* p)
1484 {
1485     DDEDATA*    pDd;
1486     HDDEDATA    ret = 0;
1487     DWORD       size;
1488
1489     if (hMem)
1490     {
1491         pDd = GlobalLock(hMem);
1492         size = GlobalSize(hMem) - sizeof(WINE_DDEHEAD);
1493         if (pDd)
1494         {
1495             if (p) memcpy(p, pDd, sizeof(WINE_DDEHEAD));
1496             switch (pDd->cfFormat)
1497             {
1498             default:
1499                 FIXME("Unsupported format (%04x) for data %p, passing raw information\n",
1500                       pDd->cfFormat, hMem);
1501                 /* fall thru */
1502             case 0:
1503             case CF_TEXT:
1504                 ret = DdeCreateDataHandle(0, pDd->Value, size, 0, 0, pDd->cfFormat, 0);
1505                 break;
1506             case CF_BITMAP:
1507                 if (size >= sizeof(BITMAP))
1508                 {
1509                     BITMAP*     bmp = (BITMAP*)pDd->Value;
1510                     int         count = bmp->bmWidthBytes * bmp->bmHeight * bmp->bmPlanes;
1511                     if (size >= sizeof(BITMAP) + count)
1512                     {
1513                         HBITMAP hbmp;
1514
1515                         if ((hbmp = CreateBitmap(bmp->bmWidth, bmp->bmHeight,
1516                                                  bmp->bmPlanes, bmp->bmBitsPixel,
1517                                                  pDd->Value + sizeof(BITMAP))))
1518                         {
1519                             ret = DdeCreateDataHandle(0, (LPBYTE)&hbmp, sizeof(hbmp),
1520                                                       0, 0, CF_BITMAP, 0);
1521                         }
1522                         else ERR("Can't create bmp\n");
1523                     }
1524                     else
1525                     {
1526                         ERR("Wrong count: %lu / %d\n", size, sizeof(BITMAP) + count);
1527                     }
1528                 } else ERR("No bitmap header\n");
1529                 break;
1530             }
1531             GlobalUnlock(hMem);
1532         }
1533     }
1534     return ret;
1535 }
1536
1537 /******************************************************************
1538  *              WDML_DataHandle2Global
1539  *
1540  *
1541  */
1542 HGLOBAL WDML_DataHandle2Global(HDDEDATA hDdeData, BOOL fResponse, BOOL fRelease,
1543                                BOOL fDeferUpd, BOOL fAckReq)
1544 {
1545     DDE_DATAHANDLE_HEAD*        pDdh;
1546     DWORD                       dwSize;
1547     HGLOBAL                     hMem = 0;
1548
1549     dwSize = GlobalSize((HGLOBAL)hDdeData) - sizeof(DDE_DATAHANDLE_HEAD);
1550     pDdh = (DDE_DATAHANDLE_HEAD*)GlobalLock((HGLOBAL)hDdeData);
1551     if (dwSize && pDdh)
1552     {
1553         WINE_DDEHEAD*    wdh = NULL;
1554
1555         switch (pDdh->cfFormat)
1556         {
1557         default:
1558             FIXME("Unsupported format (%04x) for data %p, passing raw information\n",
1559                    pDdh->cfFormat, hDdeData);
1560             /* fall thru */
1561         case 0:
1562         case CF_TEXT:
1563             hMem = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE, sizeof(WINE_DDEHEAD) + dwSize);
1564             if (hMem && (wdh = GlobalLock(hMem)))
1565             {
1566                 memcpy(wdh + 1, pDdh + 1, dwSize);
1567             }
1568             break;
1569         case CF_BITMAP:
1570             if (dwSize >= sizeof(HBITMAP))
1571             {
1572                 BITMAP  bmp;
1573                 DWORD   count;
1574                 HBITMAP hbmp = *(HBITMAP*)(pDdh + 1);
1575
1576                 if (GetObjectA(hbmp, sizeof(bmp), &bmp))
1577                 {
1578                     count = bmp.bmWidthBytes * bmp.bmHeight;
1579                     hMem = GlobalAlloc(GMEM_MOVEABLE | GMEM_DDESHARE,
1580                                        sizeof(WINE_DDEHEAD) + sizeof(bmp) + count);
1581                     if (hMem && (wdh = GlobalLock(hMem)))
1582                     {
1583                         memcpy(wdh + 1, &bmp, sizeof(bmp));
1584                         GetBitmapBits(hbmp, count, ((char*)(wdh + 1)) + sizeof(bmp));
1585                     }
1586                 }
1587             }
1588             break;
1589         }
1590         if (wdh)
1591         {
1592             wdh->unused = 0;
1593             wdh->fResponse = fResponse;
1594             wdh->fRelease = fRelease;
1595             wdh->fDeferUpd = fDeferUpd;
1596             wdh->fAckReq = fAckReq;
1597             wdh->cfFormat = pDdh->cfFormat;
1598             GlobalUnlock(hMem);
1599         }
1600         GlobalUnlock((HGLOBAL)hDdeData);
1601     }
1602
1603     return hMem;
1604 }
1605
1606 /* ================================================================
1607  *
1608  *                      Server management
1609  *
1610  * ================================================================ */
1611
1612 /******************************************************************
1613  *              WDML_AddServer
1614  *
1615  *
1616  */
1617 WDML_SERVER*    WDML_AddServer(WDML_INSTANCE* pInstance, HSZ hszService, HSZ hszTopic)
1618 {
1619     WDML_SERVER*        pServer;
1620     char                buf1[256];
1621     char                buf2[256];
1622
1623     pServer = (WDML_SERVER*)HeapAlloc(GetProcessHeap(), 0, sizeof(WDML_SERVER));
1624     if (pServer == NULL) return NULL;
1625
1626     WDML_IncHSZ(pInstance, pServer->hszService = hszService);
1627
1628     DdeQueryStringA(pInstance->instanceID, hszService, buf1, sizeof(buf1), CP_WINANSI);
1629     snprintf(buf2, sizeof(buf2), "%s(0x%08lx)", buf1, GetCurrentProcessId());
1630     pServer->hszServiceSpec = DdeCreateStringHandleA(pInstance->instanceID, buf2, CP_WINANSI);
1631
1632     pServer->atomService = WDML_MakeAtomFromHsz(pServer->hszService);
1633     pServer->atomServiceSpec = WDML_MakeAtomFromHsz(pServer->hszServiceSpec);
1634
1635     pServer->filterOn = TRUE;
1636
1637     pServer->next = pInstance->servers;
1638     pInstance->servers = pServer;
1639     return pServer;
1640 }
1641
1642 /******************************************************************
1643  *              WDML_RemoveServer
1644  *
1645  *
1646  */
1647 void WDML_RemoveServer(WDML_INSTANCE* pInstance, HSZ hszService, HSZ hszTopic)
1648 {
1649     WDML_SERVER*        pPrev = NULL;
1650     WDML_SERVER*        pServer = NULL;
1651     WDML_CONV*          pConv;
1652     WDML_CONV*          pConvNext;
1653
1654     pServer = pInstance->servers;
1655
1656     while (pServer != NULL)
1657     {
1658         if (DdeCmpStringHandles(pServer->hszService, hszService) == 0)
1659         {
1660             WDML_BroadcastDDEWindows(WDML_szEventClass, WM_WDML_UNREGISTER,
1661                                      pServer->atomService, pServer->atomServiceSpec);
1662             /* terminate all conversations for given topic */
1663             for (pConv = pInstance->convs[WDML_SERVER_SIDE]; pConv != NULL; pConv = pConvNext)
1664             {
1665                 pConvNext = pConv->next;
1666                 if (DdeCmpStringHandles(pConv->hszService, hszService) == 0)
1667                 {
1668                     WDML_RemoveConv(pConv, WDML_SERVER_SIDE);
1669                     /* don't care about return code (whether client window is present or not) */
1670                     PostMessageA(pConv->hwndClient, WM_DDE_TERMINATE, (WPARAM)pConv->hwndServer, 0L);
1671                 }
1672             }
1673             if (pServer == pInstance->servers)
1674             {
1675                 pInstance->servers = pServer->next;
1676             }
1677             else
1678             {
1679                 pPrev->next = pServer->next;
1680             }
1681
1682             DestroyWindow(pServer->hwndServer);
1683             WDML_DecHSZ(pInstance, pServer->hszServiceSpec);
1684             WDML_DecHSZ(pInstance, pServer->hszService);
1685
1686             GlobalDeleteAtom(pServer->atomService);
1687             GlobalDeleteAtom(pServer->atomServiceSpec);
1688
1689             HeapFree(GetProcessHeap(), 0, pServer);
1690             break;
1691         }
1692
1693         pPrev = pServer;
1694         pServer = pServer->next;
1695     }
1696 }
1697
1698 /*****************************************************************************
1699  *      WDML_FindServer
1700  *
1701  *      generic routine to return a pointer to the relevant ServiceNode
1702  *      for a given service name, or NULL if the entry does not exist
1703  *
1704  */
1705 WDML_SERVER*    WDML_FindServer(WDML_INSTANCE* pInstance, HSZ hszService, HSZ hszTopic)
1706 {
1707     WDML_SERVER*        pServer;
1708
1709     for (pServer = pInstance->servers; pServer != NULL; pServer = pServer->next)
1710     {
1711         if (hszService == pServer->hszService)
1712         {
1713             return pServer;
1714         }
1715     }
1716     TRACE("Service name missing\n");
1717     return NULL;
1718 }
1719
1720 /* ================================================================
1721  *
1722  *              Conversation management
1723  *
1724  * ================================================================ */
1725
1726 /******************************************************************
1727  *              WDML_AddConv
1728  *
1729  *
1730  */
1731 WDML_CONV*      WDML_AddConv(WDML_INSTANCE* pInstance, WDML_SIDE side,
1732                              HSZ hszService, HSZ hszTopic, HWND hwndClient, HWND hwndServer)
1733 {
1734     WDML_CONV*  pConv;
1735
1736     /* no converstation yet, add it */
1737     pConv = HeapAlloc(GetProcessHeap(), 0, sizeof(WDML_CONV));
1738     if (!pConv) return NULL;
1739
1740     pConv->instance = pInstance;
1741     WDML_IncHSZ(pInstance, pConv->hszService = hszService);
1742     WDML_IncHSZ(pInstance, pConv->hszTopic = hszTopic);
1743     pConv->hwndServer = hwndServer;
1744     pConv->hwndClient = hwndClient;
1745     pConv->transactions = NULL;
1746     pConv->hUser = 0;
1747     pConv->wStatus = (side == WDML_CLIENT_SIDE) ? ST_CLIENT : 0L;
1748     /* check if both side of the conversation are of the same instance */
1749     if (GetWindowThreadProcessId(hwndClient, NULL) == GetWindowThreadProcessId(hwndServer, NULL) &&
1750         WDML_GetInstanceFromWnd(hwndClient) == WDML_GetInstanceFromWnd(hwndServer))
1751     {
1752         pConv->wStatus |= ST_ISSELF;
1753     }
1754     pConv->wConvst = XST_NULL;
1755
1756     pConv->next = pInstance->convs[side];
1757     pInstance->convs[side] = pConv;
1758
1759     return pConv;
1760 }
1761
1762 /******************************************************************
1763  *              WDML_FindConv
1764  *
1765  *
1766  */
1767 WDML_CONV*      WDML_FindConv(WDML_INSTANCE* pInstance, WDML_SIDE side,
1768                               HSZ hszService, HSZ hszTopic)
1769 {
1770     WDML_CONV*  pCurrent = NULL;
1771
1772     for (pCurrent = pInstance->convs[side]; pCurrent != NULL; pCurrent = pCurrent->next)
1773     {
1774         if (DdeCmpStringHandles(pCurrent->hszService, hszService) == 0 &&
1775             DdeCmpStringHandles(pCurrent->hszTopic, hszTopic) == 0)
1776         {
1777             return pCurrent;
1778         }
1779
1780     }
1781     return NULL;
1782 }
1783
1784 /******************************************************************
1785  *              WDML_RemoveConv
1786  *
1787  *
1788  */
1789 void WDML_RemoveConv(WDML_CONV* pRef, WDML_SIDE side)
1790 {
1791     WDML_CONV*  pPrev = NULL;
1792     WDML_CONV*  pCurrent;
1793     WDML_XACT*  pXAct;
1794     WDML_XACT*  pXActNext;
1795     HWND        hWnd;
1796
1797     if (!pRef)
1798         return;
1799
1800     /* remove any pending transaction */
1801     for (pXAct = pRef->transactions; pXAct != NULL; pXAct = pXActNext)
1802     {
1803         pXActNext = pXAct->next;
1804         WDML_FreeTransaction(pRef->instance, pXAct, TRUE);
1805     }
1806
1807     WDML_RemoveAllLinks(pRef->instance, pRef, side);
1808
1809     /* FIXME: should we keep the window around ? it seems so (at least on client side
1810      * to let QueryConvInfo work after conv termination, but also to implement
1811      * DdeReconnect...
1812      */
1813     /* destroy conversation window, but first remove pConv from hWnd.
1814      * this would help the wndProc do appropriate handling upon a WM_DESTROY message
1815      */
1816     hWnd = (side == WDML_CLIENT_SIDE) ? pRef->hwndClient : pRef->hwndServer;
1817     SetWindowLongA(hWnd, GWL_WDML_CONVERSATION, 0);
1818
1819     DestroyWindow((side == WDML_CLIENT_SIDE) ? pRef->hwndClient : pRef->hwndServer);
1820
1821     WDML_DecHSZ(pRef->instance, pRef->hszService);
1822     WDML_DecHSZ(pRef->instance, pRef->hszTopic);
1823
1824     for (pCurrent = pRef->instance->convs[side]; pCurrent != NULL; pCurrent = (pPrev = pCurrent)->next)
1825     {
1826         if (pCurrent == pRef)
1827         {
1828             if (pCurrent == pRef->instance->convs[side])
1829             {
1830                 pRef->instance->convs[side] = pCurrent->next;
1831             }
1832             else
1833             {
1834                 pPrev->next = pCurrent->next;
1835             }
1836
1837             HeapFree(GetProcessHeap(), 0, pCurrent);
1838             break;
1839         }
1840     }
1841 }
1842
1843 /******************************************************************
1844  *              WDML_EnableCallback
1845  */
1846 static BOOL WDML_EnableCallback(WDML_CONV *pConv, UINT wCmd)
1847 {
1848     if (wCmd == EC_DISABLE)
1849     {
1850         FIXME("EC_DISABLE is not implemented\n");
1851         return TRUE;
1852     }
1853
1854     if (wCmd == EC_QUERYWAITING)
1855         return pConv->transactions ? TRUE : FALSE;
1856
1857     if (wCmd != EC_ENABLEALL && wCmd != EC_ENABLEONE)
1858     {
1859         FIXME("Unknown command code %04x\n", wCmd);
1860         return FALSE;
1861     }
1862
1863     while (pConv->transactions)
1864     {
1865         WDML_XACT *pXAct = pConv->transactions;
1866         WDML_UnQueueTransaction(pConv, pXAct);
1867
1868         if (pConv->wStatus & ST_CLIENT)
1869         {
1870             /*WDML_ClientHandle(pConv, pXAct);*/
1871             FIXME("Client delayed transaction queue handling is not supported\n");
1872         }
1873         else
1874             WDML_ServerHandle(pConv, pXAct);
1875
1876         WDML_FreeTransaction(pConv->instance, pXAct, TRUE);
1877
1878         if (wCmd == EC_ENABLEONE) break;
1879     }
1880     return TRUE;
1881 }
1882
1883 /*****************************************************************
1884  *            DdeEnableCallback (USER32.@)
1885  */
1886 BOOL WINAPI DdeEnableCallback(DWORD idInst, HCONV hConv, UINT wCmd)
1887 {
1888     BOOL ret = FALSE;
1889     WDML_CONV *pConv;
1890
1891     TRACE("(%ld, %p, %04x)\n", idInst, hConv, wCmd);
1892
1893     EnterCriticalSection(&WDML_CritSect);
1894
1895     pConv = WDML_GetConv(hConv, TRUE);
1896
1897     if (pConv && pConv->instance->instanceID == idInst)
1898         ret = WDML_EnableCallback(pConv, wCmd);
1899
1900     LeaveCriticalSection(&WDML_CritSect);
1901     return ret;
1902 }
1903
1904 /******************************************************************
1905  *              WDML_GetConv
1906  *
1907  *
1908  */
1909 WDML_CONV*      WDML_GetConv(HCONV hConv, BOOL checkConnected)
1910 {
1911     WDML_CONV*  pConv = (WDML_CONV*)hConv;
1912
1913     /* FIXME: should do better checking */
1914     if (pConv == NULL) return NULL;
1915
1916     if (checkConnected && !(pConv->wStatus & ST_CONNECTED))
1917     {
1918         FIXME("found conv but ain't connected\n");
1919         return NULL;
1920     }
1921     if (GetCurrentThreadId() != pConv->instance->threadID)
1922     {
1923         FIXME("wrong thread ID\n");
1924         return NULL;
1925     }
1926
1927     return pConv;
1928 }
1929
1930 /******************************************************************
1931  *              WDML_GetConvFromWnd
1932  *
1933  *
1934  */
1935 WDML_CONV*      WDML_GetConvFromWnd(HWND hWnd)
1936 {
1937     return (WDML_CONV*)GetWindowLongA(hWnd, GWL_WDML_CONVERSATION);
1938 }
1939
1940 /******************************************************************
1941  *              WDML_PostAck
1942  *
1943  *
1944  */
1945 BOOL            WDML_PostAck(WDML_CONV* pConv, WDML_SIDE side, WORD appRetCode,
1946                              BOOL fBusy, BOOL fAck, UINT pmt, LPARAM lParam, UINT oldMsg)
1947 {
1948     DDEACK      ddeAck;
1949     HWND        from, to;
1950
1951     if (side == WDML_SERVER_SIDE)
1952     {
1953         from = pConv->hwndServer;
1954         to   = pConv->hwndClient;
1955     }
1956     else
1957     {
1958         to   = pConv->hwndServer;
1959         from = pConv->hwndClient;
1960     }
1961
1962     ddeAck.bAppReturnCode = appRetCode;
1963     ddeAck.reserved       = 0;
1964     ddeAck.fBusy          = fBusy;
1965     ddeAck.fAck           = fAck;
1966
1967     TRACE("Posting a %s ack\n", ddeAck.fAck ? "positive" : "negative");
1968
1969     lParam = (lParam) ? ReuseDDElParam(lParam, oldMsg, WM_DDE_ACK, *(WORD*)&ddeAck, pmt) :
1970         PackDDElParam(WM_DDE_ACK, *(WORD*)&ddeAck, pmt);
1971     if (!PostMessageA(to, WM_DDE_ACK, (WPARAM)from, lParam))
1972     {
1973         pConv->wStatus &= ~ST_CONNECTED;
1974         FreeDDElParam(WM_DDE_ACK, lParam);
1975         return FALSE;
1976     }
1977     return TRUE;
1978 }
1979
1980 /*****************************************************************
1981  *            DdeSetUserHandle (USER32.@)
1982  */
1983 BOOL WINAPI DdeSetUserHandle(HCONV hConv, DWORD id, DWORD hUser)
1984 {
1985     WDML_CONV*  pConv;
1986     BOOL        ret = TRUE;
1987
1988     TRACE("(%p,%lx,%lx)\n", hConv, id, hUser);
1989
1990     EnterCriticalSection(&WDML_CritSect);
1991
1992     pConv = WDML_GetConv(hConv, FALSE);
1993     if (pConv == NULL)
1994     {
1995         ret = FALSE;
1996         goto theError;
1997     }
1998     if (id == QID_SYNC)
1999     {
2000         pConv->hUser = hUser;
2001     }
2002     else
2003     {
2004         WDML_XACT*      pXAct;
2005
2006         pXAct = WDML_FindTransaction(pConv, id);
2007         if (pXAct)
2008         {
2009             pXAct->hUser = hUser;
2010         }
2011         else
2012         {
2013             pConv->instance->lastError = DMLERR_UNFOUND_QUEUE_ID;
2014             ret = FALSE;
2015         }
2016     }
2017  theError:
2018     LeaveCriticalSection(&WDML_CritSect);
2019     return ret;
2020 }
2021
2022 /******************************************************************
2023  *              WDML_GetLocalConvInfo
2024  *
2025  *
2026  */
2027 static  BOOL    WDML_GetLocalConvInfo(WDML_CONV* pConv, CONVINFO* ci, DWORD id)
2028 {
2029     BOOL        ret = TRUE;
2030     WDML_LINK*  pLink;
2031     WDML_SIDE   side;
2032
2033     ci->hConvPartner = (pConv->wStatus & ST_ISLOCAL) ? (HCONV)((DWORD)pConv | 1) : 0;
2034     ci->hszSvcPartner = pConv->hszService;
2035     ci->hszServiceReq = pConv->hszService; /* FIXME: they shouldn't be the same, should they ? */
2036     ci->hszTopic = pConv->hszTopic;
2037     ci->wStatus = pConv->wStatus;
2038
2039     side = (pConv->wStatus & ST_CLIENT) ? WDML_CLIENT_SIDE : WDML_SERVER_SIDE;
2040
2041     for (pLink = pConv->instance->links[side]; pLink != NULL; pLink = pLink->next)
2042     {
2043         if (pLink->hConv == (HCONV)pConv)
2044         {
2045             ci->wStatus |= ST_ADVISE;
2046             break;
2047         }
2048     }
2049
2050     /* FIXME: non handled status flags:
2051        ST_BLOCKED
2052        ST_BLOCKNEXT
2053        ST_INLIST
2054     */
2055
2056     ci->wConvst = pConv->wConvst; /* FIXME */
2057
2058     ci->wLastError = 0; /* FIXME: note it's not the instance last error */
2059     ci->hConvList = 0;
2060     ci->ConvCtxt = pConv->convContext;
2061     if (ci->wStatus & ST_CLIENT)
2062     {
2063         ci->hwnd = pConv->hwndClient;
2064         ci->hwndPartner = pConv->hwndServer;
2065     }
2066     else
2067     {
2068         ci->hwnd = pConv->hwndServer;
2069         ci->hwndPartner = pConv->hwndClient;
2070     }
2071     if (id == QID_SYNC)
2072     {
2073         ci->hUser = pConv->hUser;
2074         ci->hszItem = 0;
2075         ci->wFmt = 0;
2076         ci->wType = 0;
2077     }
2078     else
2079     {
2080         WDML_XACT*      pXAct;
2081
2082         pXAct = WDML_FindTransaction(pConv, id);
2083         if (pXAct)
2084         {
2085             ci->hUser = pXAct->hUser;
2086             ci->hszItem = pXAct->hszItem;
2087             ci->wFmt = pXAct->wFmt;
2088             ci->wType = pXAct->wType;
2089         }
2090         else
2091         {
2092             ret = 0;
2093             pConv->instance->lastError = DMLERR_UNFOUND_QUEUE_ID;
2094         }
2095     }
2096     return ret;
2097 }
2098
2099 /******************************************************************
2100  *              DdeQueryConvInfo (USER32.@)
2101  *
2102  */
2103 UINT WINAPI DdeQueryConvInfo(HCONV hConv, DWORD id, PCONVINFO lpConvInfo)
2104 {
2105     UINT        ret = lpConvInfo->cb;
2106     CONVINFO    ci;
2107     WDML_CONV*  pConv;
2108
2109     TRACE("(%p,%lx,%p)\n", hConv, id, lpConvInfo);
2110
2111     if (!hConv)
2112     {
2113         FIXME("hConv is NULL\n");
2114         return 0;
2115     }
2116
2117     EnterCriticalSection(&WDML_CritSect);
2118
2119     pConv = WDML_GetConv(hConv, FALSE);
2120     if (pConv != NULL && !WDML_GetLocalConvInfo(pConv, &ci, id))
2121     {
2122         ret = 0;
2123     }
2124     else if ((DWORD)hConv & 1)
2125     {
2126         pConv = WDML_GetConv((HCONV)((DWORD)hConv & ~1), FALSE);
2127         if (pConv != NULL)
2128         {
2129             FIXME("Request on remote conversation information is not implemented yet\n");
2130             ret = 0;
2131         }
2132     }
2133     LeaveCriticalSection(&WDML_CritSect);
2134     if (ret != 0)
2135         memcpy(lpConvInfo, &ci, min((size_t)lpConvInfo->cb, sizeof(ci)));
2136     return ret;
2137 }
2138
2139 /* ================================================================
2140  *
2141  *                      Link (hot & warm) management
2142  *
2143  * ================================================================ */
2144
2145 /******************************************************************
2146  *              WDML_AddLink
2147  *
2148  *
2149  */
2150 void WDML_AddLink(WDML_INSTANCE* pInstance, HCONV hConv, WDML_SIDE side,
2151                   UINT wType, HSZ hszItem, UINT wFmt)
2152 {
2153     WDML_LINK*  pLink;
2154
2155     pLink = HeapAlloc(GetProcessHeap(), 0, sizeof(WDML_LINK));
2156     if (pLink == NULL)
2157     {
2158         ERR("OOM\n");
2159         return;
2160     }
2161
2162     pLink->hConv = hConv;
2163     pLink->transactionType = wType;
2164     WDML_IncHSZ(pInstance, pLink->hszItem = hszItem);
2165     pLink->uFmt = wFmt;
2166     pLink->next = pInstance->links[side];
2167     pInstance->links[side] = pLink;
2168 }
2169
2170 /******************************************************************
2171  *              WDML_RemoveLink
2172  *
2173  *
2174  */
2175 void WDML_RemoveLink(WDML_INSTANCE* pInstance, HCONV hConv, WDML_SIDE side,
2176                      HSZ hszItem, UINT uFmt)
2177 {
2178     WDML_LINK* pPrev = NULL;
2179     WDML_LINK* pCurrent = NULL;
2180
2181     pCurrent = pInstance->links[side];
2182
2183     while (pCurrent != NULL)
2184     {
2185         if (pCurrent->hConv == hConv &&
2186             DdeCmpStringHandles(pCurrent->hszItem, hszItem) == 0 &&
2187             pCurrent->uFmt == uFmt)
2188         {
2189             if (pCurrent == pInstance->links[side])
2190             {
2191                 pInstance->links[side] = pCurrent->next;
2192             }
2193             else
2194             {
2195                 pPrev->next = pCurrent->next;
2196             }
2197
2198             WDML_DecHSZ(pInstance, pCurrent->hszItem);
2199             HeapFree(GetProcessHeap(), 0, pCurrent);
2200             break;
2201         }
2202
2203         pPrev = pCurrent;
2204         pCurrent = pCurrent->next;
2205     }
2206 }
2207
2208 /* this function is called to remove all links related to the conv.
2209    It should be called from both client and server when terminating
2210    the conversation.
2211 */
2212 /******************************************************************
2213  *              WDML_RemoveAllLinks
2214  *
2215  *
2216  */
2217 void WDML_RemoveAllLinks(WDML_INSTANCE* pInstance, WDML_CONV* pConv, WDML_SIDE side)
2218 {
2219     WDML_LINK* pPrev = NULL;
2220     WDML_LINK* pCurrent = NULL;
2221     WDML_LINK* pNext = NULL;
2222
2223     pCurrent = pInstance->links[side];
2224
2225     while (pCurrent != NULL)
2226     {
2227         if (pCurrent->hConv == (HCONV)pConv)
2228         {
2229             if (pCurrent == pInstance->links[side])
2230             {
2231                 pInstance->links[side] = pCurrent->next;
2232                 pNext = pCurrent->next;
2233             }
2234             else
2235             {
2236                 pPrev->next = pCurrent->next;
2237                 pNext = pCurrent->next;
2238             }
2239
2240             WDML_DecHSZ(pInstance, pCurrent->hszItem);
2241
2242             HeapFree(GetProcessHeap(), 0, pCurrent);
2243             pCurrent = NULL;
2244         }
2245
2246         if (pCurrent)
2247         {
2248             pPrev = pCurrent;
2249             pCurrent = pCurrent->next;
2250         }
2251         else
2252         {
2253             pCurrent = pNext;
2254         }
2255     }
2256 }
2257
2258 /******************************************************************
2259  *              WDML_FindLink
2260  *
2261  *
2262  */
2263 WDML_LINK*      WDML_FindLink(WDML_INSTANCE* pInstance, HCONV hConv, WDML_SIDE side,
2264                               HSZ hszItem, BOOL use_fmt, UINT uFmt)
2265 {
2266     WDML_LINK*  pCurrent = NULL;
2267
2268     for (pCurrent = pInstance->links[side]; pCurrent != NULL; pCurrent = pCurrent->next)
2269     {
2270         /* we don't need to check for transaction type as it can be altered */
2271
2272         if (pCurrent->hConv == hConv &&
2273             DdeCmpStringHandles(pCurrent->hszItem, hszItem) == 0 &&
2274             (!use_fmt || pCurrent->uFmt == uFmt))
2275         {
2276             break;
2277         }
2278
2279     }
2280
2281     return pCurrent;
2282 }
2283
2284 /* ================================================================
2285  *
2286  *                      Transaction management
2287  *
2288  * ================================================================ */
2289
2290 /******************************************************************
2291  *              WDML_AllocTransaction
2292  *
2293  * Alloc a transaction structure for handling the message ddeMsg
2294  */
2295 WDML_XACT*      WDML_AllocTransaction(WDML_INSTANCE* pInstance, UINT ddeMsg,
2296                                       UINT wFmt, HSZ hszItem)
2297 {
2298     WDML_XACT*          pXAct;
2299     static WORD         tid = 1;        /* FIXME: wrap around */
2300
2301     pXAct = HeapAlloc(GetProcessHeap(), 0, sizeof(WDML_XACT));
2302     if (!pXAct)
2303     {
2304         pInstance->lastError = DMLERR_MEMORY_ERROR;
2305         return NULL;
2306     }
2307
2308     pXAct->xActID = tid++;
2309     pXAct->ddeMsg = ddeMsg;
2310     pXAct->hDdeData = 0;
2311     pXAct->hUser = 0;
2312     pXAct->next = NULL;
2313     pXAct->wType = 0;
2314     pXAct->wFmt = wFmt;
2315     if ((pXAct->hszItem = hszItem)) WDML_IncHSZ(pInstance, pXAct->hszItem);
2316     pXAct->atom = 0;
2317     pXAct->hMem = 0;
2318     pXAct->lParam = 0;
2319
2320     return pXAct;
2321 }
2322
2323 /******************************************************************
2324  *              WDML_QueueTransaction
2325  *
2326  * Adds a transaction to the list of transaction
2327  */
2328 void    WDML_QueueTransaction(WDML_CONV* pConv, WDML_XACT* pXAct)
2329 {
2330     WDML_XACT** pt;
2331
2332     /* advance to last in queue */
2333     for (pt = &pConv->transactions; *pt != NULL; pt = &(*pt)->next);
2334     *pt = pXAct;
2335 }
2336
2337 /******************************************************************
2338  *              WDML_UnQueueTransaction
2339  *
2340  *
2341  */
2342 BOOL    WDML_UnQueueTransaction(WDML_CONV* pConv, WDML_XACT*  pXAct)
2343 {
2344     WDML_XACT** pt;
2345
2346     for (pt = &pConv->transactions; *pt; pt = &(*pt)->next)
2347     {
2348         if (*pt == pXAct)
2349         {
2350             *pt = pXAct->next;
2351             return TRUE;
2352         }
2353     }
2354     return FALSE;
2355 }
2356
2357 /******************************************************************
2358  *              WDML_FreeTransaction
2359  *
2360  *
2361  */
2362 void    WDML_FreeTransaction(WDML_INSTANCE* pInstance, WDML_XACT* pXAct, BOOL doFreePmt)
2363 {
2364     /* free pmt(s) in pXAct too. check against one for not deleting TRUE return values */
2365     if (doFreePmt && (DWORD)pXAct->hMem > 1)
2366     {
2367         GlobalFree(pXAct->hMem);
2368     }
2369     if (pXAct->hszItem) WDML_DecHSZ(pInstance, pXAct->hszItem);
2370
2371     HeapFree(GetProcessHeap(), 0, pXAct);
2372 }
2373
2374 /******************************************************************
2375  *              WDML_FindTransaction
2376  *
2377  *
2378  */
2379 WDML_XACT*      WDML_FindTransaction(WDML_CONV* pConv, DWORD tid)
2380 {
2381     WDML_XACT* pXAct;
2382
2383     tid = HIWORD(tid);
2384     for (pXAct = pConv->transactions; pXAct; pXAct = pXAct->next)
2385     {
2386         if (pXAct->xActID == tid)
2387             break;
2388     }
2389     return pXAct;
2390 }
2391
2392 /* ================================================================
2393  *
2394  *         Information broadcast across DDEML implementations
2395  *
2396  * ================================================================ */
2397
2398 struct tagWDML_BroadcastPmt
2399 {
2400     LPCSTR      clsName;
2401     UINT        uMsg;
2402     WPARAM      wParam;
2403     LPARAM      lParam;
2404 };
2405
2406 /******************************************************************
2407  *              WDML_BroadcastEnumProc
2408  *
2409  *
2410  */
2411 static  BOOL CALLBACK WDML_BroadcastEnumProc(HWND hWnd, LPARAM lParam)
2412 {
2413     struct tagWDML_BroadcastPmt*        s = (struct tagWDML_BroadcastPmt*)lParam;
2414     char                                buffer[128];
2415
2416     if (GetClassNameA(hWnd, buffer, sizeof(buffer)) > 0 &&
2417         strcmp(buffer, s->clsName) == 0)
2418     {
2419         PostMessageA(hWnd, s->uMsg, s->wParam, s->lParam);
2420     }
2421     return TRUE;
2422 }
2423
2424 /******************************************************************
2425  *              WDML_BroadcastDDEWindows
2426  *
2427  *
2428  */
2429 void WDML_BroadcastDDEWindows(const char* clsName, UINT uMsg, WPARAM wParam, LPARAM lParam)
2430 {
2431     struct tagWDML_BroadcastPmt s;
2432
2433     s.clsName = clsName;
2434     s.uMsg    = uMsg;
2435     s.wParam  = wParam;
2436     s.lParam  = lParam;
2437     EnumWindows(WDML_BroadcastEnumProc, (LPARAM)&s);
2438 }