dlls/shell32/shellole.c

   1 /*
   2  *      handling of SHELL32.DLL OLE-Objects
   3  *
   4  *      Copyright 1997  Marcus Meissner
   5  *      Copyright 1998  Juergen Schmied  <juergen.schmied@metronet.de>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "config.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #define COBJMACROS
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "shellapi.h"
  33 #include "wingdi.h"
  34 #include "winuser.h"
  35 #include "shlobj.h"
  36 #include "shlguid.h"
  37 #include "winreg.h"
  38 #include "winerror.h"
  39
  40 #include "undocshell.h"
  41 #include "wine/unicode.h"
  42 #include "shell32_main.h"
  43
  44 #include "wine/debug.h"
  45 #include "shlwapi.h"
  46 #include "debughlp.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(shell);
  49
  50 extern INT WINAPI SHStringFromGUIDW(REFGUID guid, LPWSTR lpszDest, INT cchMax);  /* shlwapi.24 */
  51
  52 /**************************************************************************
  53  * Default ClassFactory types
  54  */
  55 typedef HRESULT (CALLBACK *LPFNCREATEINSTANCE)(IUnknown* pUnkOuter, REFIID riid, LPVOID* ppvObject);
  56 static IClassFactory * IDefClF_fnConstructor(LPFNCREATEINSTANCE lpfnCI, PLONG pcRefDll, REFIID riidInst);
  57
  58 /* this table contains all CLSID's of shell32 objects */
  59 static const struct {
  60         REFIID                  riid;
  61         LPFNCREATEINSTANCE      lpfnCI;
  62 } InterfaceTable[] = {
  63         {&CLSID_ShellFSFolder,  IFSFolder_Constructor},
  64         {&CLSID_MyComputer,     ISF_MyComputer_Constructor},
  65         {&CLSID_NetworkPlaces,  ISF_NetworkPlaces_Constructor},
  66         {&CLSID_ShellDesktop,   ISF_Desktop_Constructor},
  67         {&CLSID_ShellLink,      IShellLink_Constructor},
  68         {&CLSID_DragDropHelper, IDropTargetHelper_Constructor},
  69         {&CLSID_ControlPanel,   IControlPanel_Constructor},
  70         {&CLSID_AutoComplete,   IAutoComplete_Constructor},
  71         {&CLSID_UnixFolder,     UnixFolder_Constructor},
  72         {&CLSID_UnixDosFolder,  UnixDosFolder_Constructor},
  73         {&CLSID_FolderShortcut, FolderShortcut_Constructor},
  74         {&CLSID_MyDocuments,    MyDocuments_Constructor},
  75         {&CLSID_RecycleBin,     RecycleBin_Constructor},
  76         {NULL,NULL}
  77 };
  78
  79
  80
  81 /*************************************************************************
  82  * SHCoCreateInstance [SHELL32.102]
  83  *
  84  * Equivalent to CoCreateInstance. Under Windows 9x this function could sometimes
  85  * use the shell32 built-in "mini-COM" without the need to load ole32.dll - see
  86  * SHLoadOLE for details.
  87  *
  88  * Under wine if a "LoadWithoutCOM" value is present or the object resides in
  89  * shell32.dll the function will load the object manually without the help of ole32
  90  *
  91  * NOTES
  92  *     exported by ordinal
  93  *
  94  * SEE ALSO
  95  *     CoCreateInstace, SHLoadOLE
  96  */
  97 HRESULT WINAPI SHCoCreateInstance(
  98         LPCWSTR aclsid,
  99         const CLSID *clsid,
 100         LPUNKNOWN pUnkOuter,
 101         REFIID refiid,
 102         LPVOID *ppv)
 103 {
 104         DWORD   hres;
 105         IID     iid;
 106         const   CLSID * myclsid = clsid;
 107         WCHAR   sKeyName[MAX_PATH];
 108         const   WCHAR sCLSID[7] = {'C','L','S','I','D','\\','\0'};
 109         WCHAR   sClassID[60];
 110         const WCHAR sInProcServer32[16] ={'\\','I','n','p','r','o','c','S','e','r','v','e','r','3','2','\0'};
 111         const WCHAR sLoadWithoutCOM[15] ={'L','o','a','d','W','i','t','h','o','u','t','C','O','M','\0'};
 112         WCHAR   sDllPath[MAX_PATH];
 113         HKEY    hKey = 0;
 114         DWORD   dwSize;
 115         IClassFactory * pcf = NULL;
 116
 117         if(!ppv) return E_POINTER;
 118         *ppv=NULL;
 119
 120         /* if the clsid is a string, convert it */
 121         if (!clsid)
 122         {
 123           if (!aclsid) return REGDB_E_CLASSNOTREG;
 124           SHCLSIDFromStringW(aclsid, &iid);
 125           myclsid = &iid;
 126         }
 127
 128         TRACE("(%p,%s,unk:%p,%s,%p)\n",
 129                 aclsid,shdebugstr_guid(myclsid),pUnkOuter,shdebugstr_guid(refiid),ppv);
 130
 131         if (SUCCEEDED(DllGetClassObject(myclsid, &IID_IClassFactory,(LPVOID*)&pcf)))
 132         {
 133             hres = IClassFactory_CreateInstance(pcf, pUnkOuter, refiid, ppv);
 134             IClassFactory_Release(pcf);
 135             goto end;
 136         }
 137
 138         /* we look up the dll path in the registry */
 139         SHStringFromGUIDW(myclsid, sClassID, sizeof(sClassID)/sizeof(WCHAR));
 140         lstrcpyW(sKeyName, sCLSID);
 141         lstrcatW(sKeyName, sClassID);
 142         lstrcatW(sKeyName, sInProcServer32);
 143
 144         if (RegOpenKeyExW(HKEY_CLASSES_ROOT, sKeyName, 0, KEY_READ, &hKey))
 145             return E_ACCESSDENIED;
 146
 147         /* if a special registry key is set, we load a shell extension without help of OLE32 */
 148         if (!SHQueryValueExW(hKey, sLoadWithoutCOM, 0, 0, 0, 0))
 149         {
 150             /* load an external dll without ole32 */
 151             HANDLE hLibrary;
 152             typedef HRESULT (CALLBACK *DllGetClassObjectFunc)(REFCLSID clsid, REFIID iid, LPVOID *ppv);
 153             DllGetClassObjectFunc DllGetClassObject;
 154
 155             dwSize = sizeof(sDllPath);
 156             SHQueryValueExW(hKey, NULL, 0,0, sDllPath, &dwSize );
 157
 158             if ((hLibrary = LoadLibraryExW(sDllPath, 0, LOAD_WITH_ALTERED_SEARCH_PATH)) == 0) {
 159                 ERR("couldn't load InprocServer32 dll %s\n", debugstr_w(sDllPath));
 160                 hres = E_ACCESSDENIED;
 161                 goto end;
 162             } else if (!(DllGetClassObject = (DllGetClassObjectFunc)GetProcAddress(hLibrary, "DllGetClassObject"))) {
 163                 ERR("couldn't find function DllGetClassObject in %s\n", debugstr_w(sDllPath));
 164                 FreeLibrary( hLibrary );
 165                 hres = E_ACCESSDENIED;
 166                 goto end;
 167             } else if (FAILED(hres = DllGetClassObject(myclsid, &IID_IClassFactory, (LPVOID*)&pcf))) {
 168                     TRACE("GetClassObject failed 0x%08x\n", hres);
 169                     goto end;
 170             }
 171
 172             hres = IClassFactory_CreateInstance(pcf, pUnkOuter, refiid, ppv);
 173             IClassFactory_Release(pcf);
 174         } else {
 175
 176             /* load an external dll in the usual way */
 177             hres = CoCreateInstance(myclsid, pUnkOuter, CLSCTX_INPROC_SERVER, refiid, ppv);
 178         }
 179
 180 end:
 181         if (hKey) RegCloseKey(hKey);
 182         if(hres!=S_OK)
 183         {
 184           ERR("failed (0x%08x) to create CLSID:%s IID:%s\n",
 185               hres, shdebugstr_guid(myclsid), shdebugstr_guid(refiid));
 186           ERR("class not found in registry\n");
 187         }
 188
 189         TRACE("-- instance: %p\n",*ppv);
 190         return hres;
 191 }
 192
 193 /*************************************************************************
 194  * DllGetClassObject     [SHELL32.@]
 195  * SHDllGetClassObject   [SHELL32.128]
 196  */
 197 HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID iid, LPVOID *ppv)
 198 {
 199         HRESULT hres = E_OUTOFMEMORY;
 200         IClassFactory * pcf = NULL;
 201         int i;
 202
 203         TRACE("CLSID:%s,IID:%s\n",shdebugstr_guid(rclsid),shdebugstr_guid(iid));
 204
 205         if (!ppv) return E_INVALIDARG;
 206         *ppv = NULL;
 207
 208         /* search our internal interface table */
 209         for(i=0;InterfaceTable[i].riid;i++) {
 210             if(IsEqualIID(InterfaceTable[i].riid, rclsid)) {
 211                 TRACE("index[%u]\n", i);
 212                 pcf = IDefClF_fnConstructor(InterfaceTable[i].lpfnCI, NULL, NULL);
 213             }
 214         }
 215
 216         if (!pcf) {
 217             FIXME("failed for CLSID=%s\n", shdebugstr_guid(rclsid));
 218             return CLASS_E_CLASSNOTAVAILABLE;
 219         }
 220
 221         hres = IClassFactory_QueryInterface(pcf, iid, ppv);
 222         IClassFactory_Release(pcf);
 223
 224         TRACE("-- pointer to class factory: %p\n",*ppv);
 225         return hres;
 226 }
 227
 228 /*************************************************************************
 229  * SHCLSIDFromString                            [SHELL32.147]
 230  *
 231  * Under Windows 9x this was an ANSI version of CLSIDFromString. It also allowed
 232  * to avoid dependency on ole32.dll (see SHLoadOLE for details).
 233  *
 234  * Under Windows NT/2000/XP this is equivalent to CLSIDFromString
 235  *
 236  * NOTES
 237  *     exported by ordinal
 238  *
 239  * SEE ALSO
 240  *     CLSIDFromString, SHLoadOLE
 241  */
 242 DWORD WINAPI SHCLSIDFromStringA (LPCSTR clsid, CLSID *id)
 243 {
 244     WCHAR buffer[40];
 245     TRACE("(%p(%s) %p)\n", clsid, clsid, id);
 246     if (!MultiByteToWideChar( CP_ACP, 0, clsid, -1, buffer, sizeof(buffer)/sizeof(WCHAR) ))
 247         return CO_E_CLASSSTRING;
 248     return CLSIDFromString( buffer, id );
 249 }
 250 DWORD WINAPI SHCLSIDFromStringW (LPCWSTR clsid, CLSID *id)
 251 {
 252         TRACE("(%p(%s) %p)\n", clsid, debugstr_w(clsid), id);
 253         return CLSIDFromString((LPWSTR)clsid, id);
 254 }
 255 DWORD WINAPI SHCLSIDFromStringAW (LPCVOID clsid, CLSID *id)
 256 {
 257         if (SHELL_OsIsUnicode())
 258           return SHCLSIDFromStringW (clsid, id);
 259         return SHCLSIDFromStringA (clsid, id);
 260 }
 261
 262 /*************************************************************************
 263  *                       SHGetMalloc                    [SHELL32.@]
 264  *
 265  * Equivalent to CoGetMalloc(MEMCTX_TASK, ...). Under Windows 9x this function
 266  * could use the shell32 built-in "mini-COM" without the need to load ole32.dll -
 267  * see SHLoadOLE for details.
 268  *
 269  * PARAMS
 270  *  lpmal [O] Destination for IMalloc interface.
 271  *
 272  * RETURNS
 273  *  Success: S_OK. lpmal contains the shells IMalloc interface.
 274  *  Failure. An HRESULT error code.
 275  *
 276  * SEE ALSO
 277  *  CoGetMalloc, SHLoadOLE
 278  */
 279 HRESULT WINAPI SHGetMalloc(LPMALLOC *lpmal)
 280 {
 281         TRACE("(%p)\n", lpmal);
 282         return CoGetMalloc(MEMCTX_TASK, lpmal);
 283 }
 284
 285 /*************************************************************************
 286  * SHAlloc                                      [SHELL32.196]
 287  *
 288  * Equivalent to CoTaskMemAlloc. Under Windows 9x this function could use
 289  * the shell32 built-in "mini-COM" without the need to load ole32.dll -
 290  * see SHLoadOLE for details.
 291  *
 292  * NOTES
 293  *     exported by ordinal
 294  *
 295  * SEE ALSO
 296  *     CoTaskMemAlloc, SHLoadOLE
 297  */
 298 LPVOID WINAPI SHAlloc(DWORD len)
 299 {
 300         LPVOID ret;
 301
 302         ret = CoTaskMemAlloc(len);
 303         TRACE("%u bytes at %p\n",len, ret);
 304         return ret;
 305 }
 306
 307 /*************************************************************************
 308  * SHFree                                       [SHELL32.195]
 309  *
 310  * Equivalent to CoTaskMemFree. Under Windows 9x this function could use
 311  * the shell32 built-in "mini-COM" without the need to load ole32.dll -
 312  * see SHLoadOLE for details.
 313  *
 314  * NOTES
 315  *     exported by ordinal
 316  *
 317  * SEE ALSO
 318  *     CoTaskMemFree, SHLoadOLE
 319  */
 320 void WINAPI SHFree(LPVOID pv)
 321 {
 322         TRACE("%p\n",pv);
 323         CoTaskMemFree(pv);
 324 }
 325
 326 /*************************************************************************
 327  * SHGetDesktopFolder                   [SHELL32.@]
 328  */
 329 HRESULT WINAPI SHGetDesktopFolder(IShellFolder **psf)
 330 {
 331         HRESULT hres = S_OK;
 332         TRACE("\n");
 333
 334         if(!psf) return E_INVALIDARG;
 335         *psf = NULL;
 336         hres = ISF_Desktop_Constructor(NULL, &IID_IShellFolder,(LPVOID*)psf);
 337
 338         TRACE("-- %p->(%p)\n",psf, *psf);
 339         return hres;
 340 }
 341 /**************************************************************************
 342  * Default ClassFactory Implementation
 343  *
 344  * SHCreateDefClassObject
 345  *
 346  * NOTES
 347  *  Helper function for dlls without their own classfactory.
 348  *  A generic classfactory is returned.
 349  *  When the CreateInstance of the cf is called the callback is executed.
 350  */
 351
 352 typedef struct
 353 {
 354     const IClassFactoryVtbl    *lpVtbl;
 355     LONG                        ref;
 356     CLSID                       *rclsid;
 357     LPFNCREATEINSTANCE          lpfnCI;
 358     const IID *                 riidInst;
 359     LONG *                      pcRefDll; /* pointer to refcounter in external dll (ugrrr...) */
 360 } IDefClFImpl;
 361
 362 static const IClassFactoryVtbl dclfvt;
 363
 364 /**************************************************************************
 365  *  IDefClF_fnConstructor
 366  */
 367
 368 static IClassFactory * IDefClF_fnConstructor(LPFNCREATEINSTANCE lpfnCI, PLONG pcRefDll, REFIID riidInst)
 369 {
 370         IDefClFImpl* lpclf;
 371
 372         lpclf = HeapAlloc(GetProcessHeap(),0,sizeof(IDefClFImpl));
 373         lpclf->ref = 1;
 374         lpclf->lpVtbl = &dclfvt;
 375         lpclf->lpfnCI = lpfnCI;
 376         lpclf->pcRefDll = pcRefDll;
 377
 378         if (pcRefDll) InterlockedIncrement(pcRefDll);
 379         lpclf->riidInst = riidInst;
 380
 381         TRACE("(%p)%s\n",lpclf, shdebugstr_guid(riidInst));
 382         return (LPCLASSFACTORY)lpclf;
 383 }
 384 /**************************************************************************
 385  *  IDefClF_fnQueryInterface
 386  */
 387 static HRESULT WINAPI IDefClF_fnQueryInterface(
 388   LPCLASSFACTORY iface, REFIID riid, LPVOID *ppvObj)
 389 {
 390         IDefClFImpl *This = (IDefClFImpl *)iface;
 391
 392         TRACE("(%p)->(%s)\n",This,shdebugstr_guid(riid));
 393
 394         *ppvObj = NULL;
 395
 396         if(IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IClassFactory)) {
 397           *ppvObj = This;
 398           InterlockedIncrement(&This->ref);
 399           return S_OK;
 400         }
 401
 402         TRACE("-- E_NOINTERFACE\n");
 403         return E_NOINTERFACE;
 404 }
 405 /******************************************************************************
 406  * IDefClF_fnAddRef
 407  */
 408 static ULONG WINAPI IDefClF_fnAddRef(LPCLASSFACTORY iface)
 409 {
 410         IDefClFImpl *This = (IDefClFImpl *)iface;
 411         ULONG refCount = InterlockedIncrement(&This->ref);
 412
 413         TRACE("(%p)->(count=%u)\n", This, refCount - 1);
 414
 415         return refCount;
 416 }
 417 /******************************************************************************
 418  * IDefClF_fnRelease
 419  */
 420 static ULONG WINAPI IDefClF_fnRelease(LPCLASSFACTORY iface)
 421 {
 422         IDefClFImpl *This = (IDefClFImpl *)iface;
 423         ULONG refCount = InterlockedDecrement(&This->ref);
 424
 425         TRACE("(%p)->(count=%u)\n", This, refCount + 1);
 426
 427         if (!refCount)
 428         {
 429           if (This->pcRefDll) InterlockedDecrement(This->pcRefDll);
 430
 431           TRACE("-- destroying IClassFactory(%p)\n",This);
 432           HeapFree(GetProcessHeap(),0,This);
 433           return 0;
 434         }
 435         return refCount;
 436 }
 437 /******************************************************************************
 438  * IDefClF_fnCreateInstance
 439  */
 440 static HRESULT WINAPI IDefClF_fnCreateInstance(
 441   LPCLASSFACTORY iface, LPUNKNOWN pUnkOuter, REFIID riid, LPVOID *ppvObject)
 442 {
 443         IDefClFImpl *This = (IDefClFImpl *)iface;
 444
 445         TRACE("%p->(%p,%s,%p)\n",This,pUnkOuter,shdebugstr_guid(riid),ppvObject);
 446
 447         *ppvObject = NULL;
 448
 449         if ( This->riidInst==NULL ||
 450              IsEqualCLSID(riid, This->riidInst) ||
 451              IsEqualCLSID(riid, &IID_IUnknown) )
 452         {
 453           return This->lpfnCI(pUnkOuter, riid, ppvObject);
 454         }
 455
 456         ERR("unknown IID requested %s\n",shdebugstr_guid(riid));
 457         return E_NOINTERFACE;
 458 }
 459 /******************************************************************************
 460  * IDefClF_fnLockServer
 461  */
 462 static HRESULT WINAPI IDefClF_fnLockServer(LPCLASSFACTORY iface, BOOL fLock)
 463 {
 464         IDefClFImpl *This = (IDefClFImpl *)iface;
 465         TRACE("%p->(0x%x), not implemented\n",This, fLock);
 466         return E_NOTIMPL;
 467 }
 468
 469 static const IClassFactoryVtbl dclfvt =
 470 {
 471     IDefClF_fnQueryInterface,
 472     IDefClF_fnAddRef,
 473   IDefClF_fnRelease,
 474   IDefClF_fnCreateInstance,
 475   IDefClF_fnLockServer
 476 };
 477
 478 /******************************************************************************
 479  * SHCreateDefClassObject                       [SHELL32.70]
 480  */
 481 HRESULT WINAPI SHCreateDefClassObject(
 482         REFIID  riid,
 483         LPVOID* ppv,
 484         LPFNCREATEINSTANCE lpfnCI,      /* [in] create instance callback entry */
 485         LPDWORD pcRefDll,               /* [in/out] ref count of the dll */
 486         REFIID  riidInst)               /* [in] optional interface to the instance */
 487 {
 488         IClassFactory * pcf;
 489
 490         TRACE("%s %p %p %p %s\n",
 491               shdebugstr_guid(riid), ppv, lpfnCI, pcRefDll, shdebugstr_guid(riidInst));
 492
 493         if (! IsEqualCLSID(riid, &IID_IClassFactory) ) return E_NOINTERFACE;
 494         if (! (pcf = IDefClF_fnConstructor(lpfnCI, (PLONG)pcRefDll, riidInst))) return E_OUTOFMEMORY;
 495         *ppv = pcf;
 496         return NOERROR;
 497 }
 498
 499 /*************************************************************************
 500  *  DragAcceptFiles             [SHELL32.@]
 501  */
 502 void WINAPI DragAcceptFiles(HWND hWnd, BOOL b)
 503 {
 504         LONG exstyle;
 505
 506         if( !IsWindow(hWnd) ) return;
 507         exstyle = GetWindowLongA(hWnd,GWL_EXSTYLE);
 508         if (b)
 509           exstyle |= WS_EX_ACCEPTFILES;
 510         else
 511           exstyle &= ~WS_EX_ACCEPTFILES;
 512         SetWindowLongA(hWnd,GWL_EXSTYLE,exstyle);
 513 }
 514
 515 /*************************************************************************
 516  * DragFinish           [SHELL32.@]
 517  */
 518 void WINAPI DragFinish(HDROP h)
 519 {
 520         TRACE("\n");
 521         GlobalFree((HGLOBAL)h);
 522 }
 523
 524 /*************************************************************************
 525  * DragQueryPoint               [SHELL32.@]
 526  */
 527 BOOL WINAPI DragQueryPoint(HDROP hDrop, POINT *p)
 528 {
 529         DROPFILES *lpDropFileStruct;
 530         BOOL bRet;
 531
 532         TRACE("\n");
 533
 534         lpDropFileStruct = GlobalLock(hDrop);
 535
 536         *p = lpDropFileStruct->pt;
 537         bRet = lpDropFileStruct->fNC;
 538
 539         GlobalUnlock(hDrop);
 540         return bRet;
 541 }
 542
 543 /*************************************************************************
 544  *  DragQueryFileA              [SHELL32.@]
 545  *  DragQueryFile               [SHELL32.@]
 546  */
 547 UINT WINAPI DragQueryFileA(
 548         HDROP hDrop,
 549         UINT lFile,
 550         LPSTR lpszFile,
 551         UINT lLength)
 552 {
 553         LPSTR lpDrop;
 554         UINT i = 0;
 555         DROPFILES *lpDropFileStruct = GlobalLock(hDrop);
 556
 557         TRACE("(%p, %x, %p, %u)\n",     hDrop,lFile,lpszFile,lLength);
 558
 559         if(!lpDropFileStruct) goto end;
 560
 561         lpDrop = (LPSTR) lpDropFileStruct + lpDropFileStruct->pFiles;
 562
 563         if(lpDropFileStruct->fWide) {
 564             LPWSTR lpszFileW = NULL;
 565
 566             if(lpszFile) {
 567                 lpszFileW = HeapAlloc(GetProcessHeap(), 0, lLength*sizeof(WCHAR));
 568                 if(lpszFileW == NULL) {
 569                     goto end;
 570                 }
 571             }
 572             i = DragQueryFileW(hDrop, lFile, lpszFileW, lLength);
 573
 574             if(lpszFileW) {
 575                 WideCharToMultiByte(CP_ACP, 0, lpszFileW, -1, lpszFile, lLength, 0, NULL);
 576                 HeapFree(GetProcessHeap(), 0, lpszFileW);
 577             }
 578             goto end;
 579         }
 580
 581         while (i++ < lFile)
 582         {
 583           while (*lpDrop++); /* skip filename */
 584           if (!*lpDrop)
 585           {
 586             i = (lFile == 0xFFFFFFFF) ? i : 0;
 587             goto end;
 588           }
 589         }
 590
 591         i = strlen(lpDrop);
 592         if (!lpszFile ) goto end;   /* needed buffer size */
 593         lstrcpynA (lpszFile, lpDrop, lLength);
 594 end:
 595         GlobalUnlock(hDrop);
 596         return i;
 597 }
 598
 599 /*************************************************************************
 600  *  DragQueryFileW              [SHELL32.@]
 601  */
 602 UINT WINAPI DragQueryFileW(
 603         HDROP hDrop,
 604         UINT lFile,
 605         LPWSTR lpszwFile,
 606         UINT lLength)
 607 {
 608         LPWSTR lpwDrop;
 609         UINT i = 0;
 610         DROPFILES *lpDropFileStruct = GlobalLock(hDrop);
 611
 612         TRACE("(%p, %x, %p, %u)\n", hDrop,lFile,lpszwFile,lLength);
 613
 614         if(!lpDropFileStruct) goto end;
 615
 616         lpwDrop = (LPWSTR) ((LPSTR)lpDropFileStruct + lpDropFileStruct->pFiles);
 617
 618         if(lpDropFileStruct->fWide == FALSE) {
 619             LPSTR lpszFileA = NULL;
 620
 621             if(lpszwFile) {
 622                 lpszFileA = HeapAlloc(GetProcessHeap(), 0, lLength);
 623                 if(lpszFileA == NULL) {
 624                     goto end;
 625                 }
 626             }
 627             i = DragQueryFileA(hDrop, lFile, lpszFileA, lLength);
 628
 629             if(lpszFileA) {
 630                 MultiByteToWideChar(CP_ACP, 0, lpszFileA, -1, lpszwFile, lLength);
 631                 HeapFree(GetProcessHeap(), 0, lpszFileA);
 632             }
 633             goto end;
 634         }
 635
 636         i = 0;
 637         while (i++ < lFile)
 638         {
 639           while (*lpwDrop++); /* skip filename */
 640           if (!*lpwDrop)
 641           {
 642             i = (lFile == 0xFFFFFFFF) ? i : 0;
 643             goto end;
 644           }
 645         }
 646
 647         i = strlenW(lpwDrop);
 648         if ( !lpszwFile) goto end;   /* needed buffer size */
 649         lstrcpynW (lpszwFile, lpwDrop, lLength);
 650 end:
 651         GlobalUnlock(hDrop);
 652         return i;
 653 }