dlls/ole32/oleobj.c

   1 /*
   2  *      OLE2 COM objects
   3  *
   4  *      Copyright 1998 Eric Kohl
   5  *      Copyright 1999 Francis Beaudet
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22
  23 #include <string.h>
  24 #include "winbase.h"
  25 #include "winerror.h"
  26 #include "wine/debug.h"
  27 #include "oleidl.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  30
  31 #define INITIAL_SINKS 10
  32
  33 /**************************************************************************
  34  *  OleAdviseHolderImpl Implementation
  35  */
  36 typedef struct OleAdviseHolderImpl
  37 {
  38   ICOM_VFIELD(IOleAdviseHolder);
  39
  40   DWORD ref;
  41
  42   DWORD         maxSinks;
  43   IAdviseSink** arrayOfSinks;
  44
  45 } OleAdviseHolderImpl;
  46
  47 static LPOLEADVISEHOLDER OleAdviseHolderImpl_Constructor();
  48 static void              OleAdviseHolderImpl_Destructor(OleAdviseHolderImpl* ptrToDestroy);
  49 static HRESULT WINAPI    OleAdviseHolderImpl_QueryInterface(LPOLEADVISEHOLDER,REFIID,LPVOID*);
  50 static ULONG WINAPI      OleAdviseHolderImpl_AddRef(LPOLEADVISEHOLDER);
  51 static ULONG WINAPI      OleAdviseHolderImpl_Release(LPOLEADVISEHOLDER);
  52 static HRESULT WINAPI    OleAdviseHolderImpl_Advise(LPOLEADVISEHOLDER, IAdviseSink*, DWORD*);
  53 static HRESULT WINAPI    OleAdviseHolderImpl_Unadvise (LPOLEADVISEHOLDER, DWORD);
  54 static HRESULT WINAPI    OleAdviseHolderImpl_EnumAdvise (LPOLEADVISEHOLDER, IEnumSTATDATA **);
  55 static HRESULT WINAPI    OleAdviseHolderImpl_SendOnRename (LPOLEADVISEHOLDER, IMoniker *);
  56 static HRESULT WINAPI    OleAdviseHolderImpl_SendOnSave (LPOLEADVISEHOLDER);
  57 static HRESULT WINAPI    OleAdviseHolderImpl_SendOnClose (LPOLEADVISEHOLDER);
  58
  59
  60 /**************************************************************************
  61  *  OleAdviseHolderImpl_VTable
  62  */
  63 static struct ICOM_VTABLE(IOleAdviseHolder) oahvt =
  64 {
  65     ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
  66     OleAdviseHolderImpl_QueryInterface,
  67     OleAdviseHolderImpl_AddRef,
  68     OleAdviseHolderImpl_Release,
  69     OleAdviseHolderImpl_Advise,
  70     OleAdviseHolderImpl_Unadvise,
  71     OleAdviseHolderImpl_EnumAdvise,
  72     OleAdviseHolderImpl_SendOnRename,
  73     OleAdviseHolderImpl_SendOnSave,
  74     OleAdviseHolderImpl_SendOnClose
  75 };
  76
  77 /**************************************************************************
  78  *  OleAdviseHolderImpl_Constructor
  79  */
  80
  81 static LPOLEADVISEHOLDER OleAdviseHolderImpl_Constructor()
  82 {
  83   OleAdviseHolderImpl* lpoah;
  84   DWORD                index;
  85
  86   lpoah= (OleAdviseHolderImpl*)HeapAlloc(GetProcessHeap(),
  87                                          0,
  88                                          sizeof(OleAdviseHolderImpl));
  89
  90   ICOM_VTBL(lpoah) = &oahvt;
  91   lpoah->ref = 1;
  92   lpoah->maxSinks = INITIAL_SINKS;
  93   lpoah->arrayOfSinks = HeapAlloc(GetProcessHeap(),
  94                                   0,
  95                                   lpoah->maxSinks * sizeof(IAdviseSink*));
  96
  97   for (index = 0; index < lpoah->maxSinks; index++)
  98     lpoah->arrayOfSinks[index]=0;
  99
 100   TRACE("returning %p\n", lpoah);
 101   return (LPOLEADVISEHOLDER)lpoah;
 102 }
 103
 104 /**************************************************************************
 105  *  OleAdviseHolderImpl_Destructor
 106  */
 107 static void OleAdviseHolderImpl_Destructor(
 108   OleAdviseHolderImpl* ptrToDestroy)
 109 {
 110   DWORD index;
 111   TRACE("%p\n", ptrToDestroy);
 112
 113   for (index = 0; index < ptrToDestroy->maxSinks; index++)
 114   {
 115     if (ptrToDestroy->arrayOfSinks[index]!=0)
 116     {
 117       IAdviseSink_Release(ptrToDestroy->arrayOfSinks[index]);
 118       ptrToDestroy->arrayOfSinks[index] = NULL;
 119     }
 120   }
 121
 122   HeapFree(GetProcessHeap(),
 123            0,
 124            ptrToDestroy->arrayOfSinks);
 125
 126
 127   HeapFree(GetProcessHeap(),
 128            0,
 129            ptrToDestroy);
 130 }
 131
 132 /**************************************************************************
 133  *  OleAdviseHolderImpl_QueryInterface
 134  */
 135 static HRESULT WINAPI OleAdviseHolderImpl_QueryInterface(
 136   LPOLEADVISEHOLDER iface,
 137   REFIID            riid,
 138   LPVOID*           ppvObj)
 139 {
 140   ICOM_THIS(OleAdviseHolderImpl, iface);
 141   TRACE("(%p)->(%s,%p)\n",This,debugstr_guid(riid),ppvObj);
 142   /*
 143    * Sanity check
 144    */
 145   if (ppvObj==NULL)
 146     return E_POINTER;
 147
 148   *ppvObj = NULL;
 149
 150   if (IsEqualIID(riid, &IID_IUnknown))
 151   {
 152     /* IUnknown */
 153     *ppvObj = This;
 154   }
 155   else if(IsEqualIID(riid, &IID_IOleAdviseHolder))
 156   {
 157     /* IOleAdviseHolder */
 158     *ppvObj = (IOleAdviseHolder*) This;
 159   }
 160
 161   if(*ppvObj == NULL)
 162     return E_NOINTERFACE;
 163
 164   /*
 165    * A successful QI always increments the reference count.
 166    */
 167   IUnknown_AddRef((IUnknown*)*ppvObj);
 168
 169   return S_OK;
 170 }
 171
 172 /******************************************************************************
 173  * OleAdviseHolderImpl_AddRef
 174  */
 175 static ULONG WINAPI OleAdviseHolderImpl_AddRef(
 176   LPOLEADVISEHOLDER iface)
 177 {
 178   ICOM_THIS(OleAdviseHolderImpl, iface);
 179   TRACE("(%p)->(ref=%ld)\n", This, This->ref);
 180   return ++(This->ref);
 181 }
 182
 183 /******************************************************************************
 184  * OleAdviseHolderImpl_Release
 185  */
 186 static ULONG WINAPI OleAdviseHolderImpl_Release(
 187   LPOLEADVISEHOLDER iface)
 188 {
 189   ICOM_THIS(OleAdviseHolderImpl, iface);
 190   TRACE("(%p)->(ref=%ld)\n", This, This->ref);
 191   This->ref--;
 192
 193   if (This->ref == 0)
 194   {
 195     OleAdviseHolderImpl_Destructor(This);
 196
 197     return 0;
 198   }
 199
 200   return This->ref;
 201 }
 202
 203 /******************************************************************************
 204  * OleAdviseHolderImpl_Advise
 205  */
 206 static HRESULT WINAPI OleAdviseHolderImpl_Advise(
 207   LPOLEADVISEHOLDER iface,
 208   IAdviseSink*      pAdvise,
 209   DWORD*            pdwConnection)
 210 {
 211   DWORD index;
 212
 213   ICOM_THIS(OleAdviseHolderImpl, iface);
 214
 215   TRACE("(%p)->(%p, %p)\n", This, pAdvise, pdwConnection);
 216
 217   /*
 218    * Sanity check
 219    */
 220   if (pdwConnection==NULL)
 221     return E_POINTER;
 222
 223   *pdwConnection = 0;
 224
 225   /*
 226    * Find a free spot in the array.
 227    */
 228   for (index = 0; index < This->maxSinks; index++)
 229   {
 230     if (This->arrayOfSinks[index]==NULL)
 231       break;
 232   }
 233
 234   /*
 235    * If the array is full, we need to grow it.
 236    */
 237   if (index == This->maxSinks)
 238   {
 239     DWORD i;
 240
 241     This->maxSinks+=INITIAL_SINKS;
 242
 243     This->arrayOfSinks = HeapReAlloc(GetProcessHeap(),
 244                                      0,
 245                                      This->arrayOfSinks,
 246                                      This->maxSinks*sizeof(IAdviseSink*));
 247
 248     for (i=index;i < This->maxSinks; i++)
 249       This->arrayOfSinks[i]=0;
 250   }
 251
 252   /*
 253    * Store the new sink
 254    */
 255   This->arrayOfSinks[index] = pAdvise;
 256
 257   if (This->arrayOfSinks[index]!=NULL)
 258     IAdviseSink_AddRef(This->arrayOfSinks[index]);
 259
 260   /*
 261    * Return the index as the cookie.
 262    * Since 0 is not a valid cookie, we will increment by
 263    * 1 the index in the table.
 264    */
 265   *pdwConnection = index+1;
 266
 267   return S_OK;
 268 }
 269
 270 /******************************************************************************
 271  * OleAdviseHolderImpl_Unadvise
 272  */
 273 static HRESULT WINAPI OleAdviseHolderImpl_Unadvise(
 274   LPOLEADVISEHOLDER iface,
 275   DWORD             dwConnection)
 276 {
 277   ICOM_THIS(OleAdviseHolderImpl, iface);
 278
 279   TRACE("(%p)->(%lu)\n", This, dwConnection);
 280
 281   /*
 282    * So we don't return 0 as a cookie, the index was
 283    * incremented by 1 in OleAdviseHolderImpl_Advise
 284    * we have to compensate.
 285    */
 286   dwConnection--;
 287
 288   /*
 289    * Check for invalid cookies.
 290    */
 291   if (dwConnection >= This->maxSinks)
 292     return OLE_E_NOCONNECTION;
 293
 294   if (This->arrayOfSinks[dwConnection] == NULL)
 295     return OLE_E_NOCONNECTION;
 296
 297   /*
 298    * Release the sink and mark the spot in the list as free.
 299    */
 300   IAdviseSink_Release(This->arrayOfSinks[dwConnection]);
 301   This->arrayOfSinks[dwConnection] = NULL;
 302
 303   return S_OK;
 304 }
 305
 306 /******************************************************************************
 307  * OleAdviseHolderImpl_EnumAdvise
 308  */
 309 static HRESULT WINAPI
 310 OleAdviseHolderImpl_EnumAdvise (LPOLEADVISEHOLDER iface, IEnumSTATDATA **ppenumAdvise)
 311 {
 312     ICOM_THIS(OleAdviseHolderImpl, iface);
 313     FIXME("(%p)->(%p)\n", This, ppenumAdvise);
 314
 315     *ppenumAdvise = NULL;
 316
 317     return S_OK;
 318 }
 319
 320 /******************************************************************************
 321  * OleAdviseHolderImpl_SendOnRename
 322  */
 323 static HRESULT WINAPI
 324 OleAdviseHolderImpl_SendOnRename (LPOLEADVISEHOLDER iface, IMoniker *pmk)
 325 {
 326     ICOM_THIS(OleAdviseHolderImpl, iface);
 327     FIXME("(%p)->(%p)\n", This, pmk);
 328
 329
 330     return S_OK;
 331 }
 332
 333 /******************************************************************************
 334  * OleAdviseHolderImpl_SendOnSave
 335  */
 336 static HRESULT WINAPI
 337 OleAdviseHolderImpl_SendOnSave (LPOLEADVISEHOLDER iface)
 338 {
 339     ICOM_THIS(OleAdviseHolderImpl, iface);
 340     FIXME("(%p)\n", This);
 341
 342     return S_OK;
 343 }
 344
 345 /******************************************************************************
 346  * OleAdviseHolderImpl_SendOnClose
 347  */
 348 static HRESULT WINAPI
 349 OleAdviseHolderImpl_SendOnClose (LPOLEADVISEHOLDER iface)
 350 {
 351     ICOM_THIS(OleAdviseHolderImpl, iface);
 352     FIXME("(%p)\n", This);
 353
 354
 355     return S_OK;
 356 }
 357
 358 /**************************************************************************
 359  *  DataAdviseHolder Implementation
 360  */
 361 typedef struct DataAdviseConnection {
 362   IAdviseSink *sink;
 363   FORMATETC fmat;
 364   DWORD advf;
 365 } DataAdviseConnection;
 366
 367 typedef struct DataAdviseHolder
 368 {
 369   ICOM_VFIELD(IDataAdviseHolder);
 370
 371   DWORD                 ref;
 372   DWORD                 maxCons;
 373   DataAdviseConnection* Connections;
 374 } DataAdviseHolder;
 375
 376 /**************************************************************************
 377  *  DataAdviseHolder method prototypes
 378  */
 379 static IDataAdviseHolder* DataAdviseHolder_Constructor();
 380 static void               DataAdviseHolder_Destructor(DataAdviseHolder* ptrToDestroy);
 381 static HRESULT WINAPI     DataAdviseHolder_QueryInterface(
 382                             IDataAdviseHolder*      iface,
 383                             REFIID                  riid,
 384                             void**                  ppvObject);
 385 static ULONG WINAPI       DataAdviseHolder_AddRef(
 386                             IDataAdviseHolder*      iface);
 387 static ULONG WINAPI       DataAdviseHolder_Release(
 388                             IDataAdviseHolder*      iface);
 389 static HRESULT WINAPI     DataAdviseHolder_Advise(
 390                             IDataAdviseHolder*      iface,
 391                             IDataObject*            pDataObject,
 392                             FORMATETC*              pFetc,
 393                             DWORD                   advf,
 394                             IAdviseSink*            pAdvise,
 395                             DWORD*                  pdwConnection);
 396 static HRESULT WINAPI     DataAdviseHolder_Unadvise(
 397                             IDataAdviseHolder*      iface,
 398                             DWORD                   dwConnection);
 399 static HRESULT WINAPI     DataAdviseHolder_EnumAdvise(
 400                             IDataAdviseHolder*      iface,
 401                             IEnumSTATDATA**         ppenumAdvise);
 402 static HRESULT WINAPI     DataAdviseHolder_SendOnDataChange(
 403                             IDataAdviseHolder*      iface,
 404                             IDataObject*            pDataObject,
 405                             DWORD                   dwReserved,
 406                             DWORD                   advf);
 407
 408 /**************************************************************************
 409  *  DataAdviseHolderImpl_VTable
 410  */
 411 static struct ICOM_VTABLE(IDataAdviseHolder) DataAdviseHolderImpl_VTable =
 412 {
 413   ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
 414   DataAdviseHolder_QueryInterface,
 415   DataAdviseHolder_AddRef,
 416   DataAdviseHolder_Release,
 417   DataAdviseHolder_Advise,
 418   DataAdviseHolder_Unadvise,
 419   DataAdviseHolder_EnumAdvise,
 420   DataAdviseHolder_SendOnDataChange
 421 };
 422
 423 /******************************************************************************
 424  * DataAdviseHolder_Constructor
 425  */
 426 static IDataAdviseHolder* DataAdviseHolder_Constructor()
 427 {
 428   DataAdviseHolder* newHolder;
 429
 430   newHolder = (DataAdviseHolder*)HeapAlloc(GetProcessHeap(),
 431                                            0,
 432                                            sizeof(DataAdviseHolder));
 433
 434   ICOM_VTBL(newHolder) = &DataAdviseHolderImpl_VTable;
 435   newHolder->ref = 1;
 436   newHolder->maxCons = INITIAL_SINKS;
 437   newHolder->Connections = HeapAlloc(GetProcessHeap(),
 438                                      HEAP_ZERO_MEMORY,
 439                                      newHolder->maxCons *
 440                                      sizeof(DataAdviseConnection));
 441
 442   TRACE("returning %p\n", newHolder);
 443   return (IDataAdviseHolder*)newHolder;
 444 }
 445
 446 /******************************************************************************
 447  * DataAdviseHolder_Destructor
 448  */
 449 static void DataAdviseHolder_Destructor(DataAdviseHolder* ptrToDestroy)
 450 {
 451   DWORD index;
 452   TRACE("%p\n", ptrToDestroy);
 453
 454   for (index = 0; index < ptrToDestroy->maxCons; index++)
 455   {
 456     if (ptrToDestroy->Connections[index].sink != NULL)
 457     {
 458       IAdviseSink_Release(ptrToDestroy->Connections[index].sink);
 459       ptrToDestroy->Connections[index].sink = NULL;
 460     }
 461   }
 462
 463   HeapFree(GetProcessHeap(), 0, ptrToDestroy->Connections);
 464   HeapFree(GetProcessHeap(), 0, ptrToDestroy);
 465 }
 466
 467 /************************************************************************
 468  * DataAdviseHolder_QueryInterface (IUnknown)
 469  *
 470  * See Windows documentation for more details on IUnknown methods.
 471  */
 472 static HRESULT WINAPI DataAdviseHolder_QueryInterface(
 473   IDataAdviseHolder*      iface,
 474   REFIID                  riid,
 475   void**                  ppvObject)
 476 {
 477   ICOM_THIS(DataAdviseHolder, iface);
 478   TRACE("(%p)->(%s,%p)\n",This,debugstr_guid(riid),ppvObject);
 479   /*
 480    * Perform a sanity check on the parameters.
 481    */
 482   if ( (This==0) || (ppvObject==0) )
 483     return E_INVALIDARG;
 484
 485   /*
 486    * Initialize the return parameter.
 487    */
 488   *ppvObject = 0;
 489
 490   /*
 491    * Compare the riid with the interface IDs implemented by this object.
 492    */
 493   if ( (memcmp(&IID_IUnknown, riid, sizeof(IID_IUnknown)) == 0) ||
 494        (memcmp(&IID_IDataAdviseHolder, riid, sizeof(IID_IDataAdviseHolder)) == 0)  )
 495   {
 496     *ppvObject = iface;
 497   }
 498
 499   /*
 500    * Check that we obtained an interface.
 501    */
 502   if ((*ppvObject)==0)
 503   {
 504     return E_NOINTERFACE;
 505   }
 506
 507   /*
 508    * Query Interface always increases the reference count by one when it is
 509    * successful.
 510    */
 511   IUnknown_AddRef((IUnknown*)*ppvObject);
 512
 513   return S_OK;
 514 }
 515
 516 /************************************************************************
 517  * DataAdviseHolder_AddRef (IUnknown)
 518  *
 519  * See Windows documentation for more details on IUnknown methods.
 520  */
 521 static ULONG WINAPI       DataAdviseHolder_AddRef(
 522   IDataAdviseHolder*      iface)
 523 {
 524   ICOM_THIS(DataAdviseHolder, iface);
 525   TRACE("(%p) (ref=%ld)\n", This, This->ref);
 526   This->ref++;
 527
 528   return This->ref;
 529 }
 530
 531 /************************************************************************
 532  * DataAdviseHolder_Release (IUnknown)
 533  *
 534  * See Windows documentation for more details on IUnknown methods.
 535  */
 536 static ULONG WINAPI DataAdviseHolder_Release(
 537   IDataAdviseHolder*      iface)
 538 {
 539   ICOM_THIS(DataAdviseHolder, iface);
 540   TRACE("(%p) (ref=%ld)\n", This, This->ref);
 541
 542   /*
 543    * Decrease the reference count on this object.
 544    */
 545   This->ref--;
 546
 547   /*
 548    * If the reference count goes down to 0, perform suicide.
 549    */
 550   if (This->ref==0)
 551   {
 552     DataAdviseHolder_Destructor(This);
 553
 554     return 0;
 555   }
 556
 557   return This->ref;
 558 }
 559
 560 /************************************************************************
 561  * DataAdviseHolder_Advise
 562  *
 563  */
 564 static HRESULT WINAPI DataAdviseHolder_Advise(
 565   IDataAdviseHolder*      iface,
 566   IDataObject*            pDataObject,
 567   FORMATETC*              pFetc,
 568   DWORD                   advf,
 569   IAdviseSink*            pAdvise,
 570   DWORD*                  pdwConnection)
 571 {
 572   DWORD index;
 573
 574   ICOM_THIS(DataAdviseHolder, iface);
 575
 576   TRACE("(%p)->(%p, %p, %08lx, %p, %p)\n", This, pDataObject, pFetc, advf,
 577         pAdvise, pdwConnection);
 578   /*
 579    * Sanity check
 580    */
 581   if (pdwConnection==NULL)
 582     return E_POINTER;
 583
 584   *pdwConnection = 0;
 585
 586   /*
 587    * Find a free spot in the array.
 588    */
 589   for (index = 0; index < This->maxCons; index++)
 590   {
 591     if (This->Connections[index].sink == NULL)
 592       break;
 593   }
 594
 595   /*
 596    * If the array is full, we need to grow it.
 597    */
 598   if (index == This->maxCons)
 599   {
 600     This->maxCons+=INITIAL_SINKS;
 601     This->Connections = HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
 602                                     This->Connections,
 603                                     This->maxCons*sizeof(DataAdviseConnection));
 604   }
 605   /*
 606    * Store the new sink
 607    */
 608   This->Connections[index].sink = pAdvise;
 609   memcpy(&(This->Connections[index].fmat), pFetc, sizeof(FORMATETC));
 610   This->Connections[index].advf = advf;
 611
 612   if (This->Connections[index].sink != NULL) {
 613     IAdviseSink_AddRef(This->Connections[index].sink);
 614     if(advf & ADVF_PRIMEFIRST) {
 615       DataAdviseHolder_SendOnDataChange(iface, pDataObject, 0, advf);
 616     }
 617   }
 618   /*
 619    * Return the index as the cookie.
 620    * Since 0 is not a valid cookie, we will increment by
 621    * 1 the index in the table.
 622    */
 623   *pdwConnection = index+1;
 624
 625   return S_OK;
 626 }
 627
 628 /******************************************************************************
 629  * DataAdviseHolder_Unadvise
 630  */
 631 static HRESULT WINAPI     DataAdviseHolder_Unadvise(
 632   IDataAdviseHolder*      iface,
 633   DWORD                   dwConnection)
 634 {
 635   ICOM_THIS(DataAdviseHolder, iface);
 636
 637   TRACE("(%p)->(%lu)\n", This, dwConnection);
 638
 639   /*
 640    * So we don't return 0 as a cookie, the index was
 641    * incremented by 1 in OleAdviseHolderImpl_Advise
 642    * we have to compensate.
 643    */
 644   dwConnection--;
 645
 646   /*
 647    * Check for invalid cookies.
 648    */
 649   if (dwConnection >= This->maxCons)
 650     return OLE_E_NOCONNECTION;
 651
 652   if (This->Connections[dwConnection].sink == NULL)
 653     return OLE_E_NOCONNECTION;
 654
 655   /*
 656    * Release the sink and mark the spot in the list as free.
 657    */
 658   IAdviseSink_Release(This->Connections[dwConnection].sink);
 659   memset(&(This->Connections[dwConnection]), 0, sizeof(DataAdviseConnection));
 660   return S_OK;
 661 }
 662
 663 static HRESULT WINAPI     DataAdviseHolder_EnumAdvise(
 664   IDataAdviseHolder*      iface,
 665   IEnumSTATDATA**         ppenumAdvise)
 666 {
 667   ICOM_THIS(DataAdviseHolder, iface);
 668
 669   FIXME("(%p)->(%p)\n", This, ppenumAdvise);
 670   return E_NOTIMPL;
 671 }
 672
 673 /******************************************************************************
 674  * DataAdviseHolder_SendOnDataChange
 675  */
 676 static HRESULT WINAPI     DataAdviseHolder_SendOnDataChange(
 677   IDataAdviseHolder*      iface,
 678   IDataObject*            pDataObject,
 679   DWORD                   dwReserved,
 680   DWORD                   advf)
 681 {
 682   ICOM_THIS(DataAdviseHolder, iface);
 683   DWORD index;
 684   STGMEDIUM stg;
 685   HRESULT res;
 686
 687   TRACE("(%p)->(%p,%08lx,%08lx)\n", This, pDataObject, dwReserved, advf);
 688
 689   for(index = 0; index < This->maxCons; index++) {
 690     if(This->Connections[index].sink != NULL) {
 691       if(!(This->Connections[index].advf & ADVF_NODATA)) {
 692         TRACE("Calling IDataObject_GetData\n");
 693         res = IDataObject_GetData(pDataObject,
 694                                   &(This->Connections[index].fmat),
 695                                   &stg);
 696         TRACE("returns %08lx\n", res);
 697       }
 698       TRACE("Calling IAdviseSink_OnDataChange\n");
 699       IAdviseSink_OnDataChange(This->Connections[index].sink,
 700                                      &(This->Connections[index].fmat),
 701                                      &stg);
 702       TRACE("Done IAdviseSink_OnDataChange\n");
 703       if(This->Connections[index].advf & ADVF_ONLYONCE) {
 704         TRACE("Removing connection\n");
 705         DataAdviseHolder_Unadvise(iface, index+1);
 706       }
 707     }
 708   }
 709   return S_OK;
 710 }
 711
 712 /***********************************************************************
 713  * API functions
 714  */
 715
 716 /***********************************************************************
 717  * CreateOleAdviseHolder [OLE32.59]
 718  */
 719 HRESULT WINAPI CreateOleAdviseHolder(
 720   LPOLEADVISEHOLDER *ppOAHolder)
 721 {
 722   TRACE("(%p)\n", ppOAHolder);
 723
 724   /*
 725    * Sanity check,
 726    */
 727   if (ppOAHolder==NULL)
 728     return E_POINTER;
 729
 730   *ppOAHolder = OleAdviseHolderImpl_Constructor ();
 731
 732   if (*ppOAHolder != NULL)
 733     return S_OK;
 734
 735   return E_OUTOFMEMORY;
 736 }
 737
 738 /******************************************************************************
 739  *              CreateDataAdviseHolder        [OLE32.53]
 740  */
 741 HRESULT WINAPI CreateDataAdviseHolder(
 742   LPDATAADVISEHOLDER* ppDAHolder)
 743 {
 744   TRACE("(%p)\n", ppDAHolder);
 745
 746   /*
 747    * Sanity check,
 748    */
 749   if (ppDAHolder==NULL)
 750     return E_POINTER;
 751
 752   *ppDAHolder = DataAdviseHolder_Constructor();
 753
 754   if (*ppDAHolder != NULL)
 755     return S_OK;
 756
 757   return E_OUTOFMEMORY;
 758 }
 759