git.oblomov.eu Git - wine/blob - 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_ShellItem,      IShellItem_Constructor},
  68         {&CLSID_ShellLink,      IShellLink_Constructor},
  69         {&CLSID_DragDropHelper, IDropTargetHelper_Constructor},
  70         {&CLSID_ControlPanel,   IControlPanel_Constructor},
  71         {&CLSID_AutoComplete,   IAutoComplete_Constructor},
  72         {&CLSID_UnixFolder,     UnixFolder_Constructor},
  73         {&CLSID_UnixDosFolder,  UnixDosFolder_Constructor},
  74         {&CLSID_FolderShortcut, FolderShortcut_Constructor},
  75         {&CLSID_MyDocuments,    MyDocuments_Constructor},
  76         {&CLSID_RecycleBin,     RecycleBin_Constructor},
  77         {&CLSID_QueryAssociations, QueryAssociations_Constructor},
  78         {NULL,NULL}
  79 };
  80
  81
  82
  83 /*************************************************************************
  84  * SHCoCreateInstance [SHELL32.102]
  85  *
  86  * Equivalent to CoCreateInstance. Under Windows 9x this function could sometimes
  87  * use the shell32 built-in "mini-COM" without the need to load ole32.dll - see
  88  * SHLoadOLE for details.
  89  *
  90  * Under wine if a "LoadWithoutCOM" value is present or the object resides in
  91  * shell32.dll the function will load the object manually without the help of ole32
  92  *
  93  * NOTES
  94  *     exported by ordinal
  95  *
  96  * SEE ALSO
  97  *     CoCreateInstace, SHLoadOLE
  98  */
  99 HRESULT WINAPI SHCoCreateInstance(
 100         LPCWSTR aclsid,
 101         const CLSID *clsid,
 102         LPUNKNOWN pUnkOuter,
 103         REFIID refiid,
 104         LPVOID *ppv)
 105 {
 106         DWORD   hres;
 107         IID     iid;
 108         const   CLSID * myclsid = clsid;
 109         WCHAR   sKeyName[MAX_PATH];
 110         const   WCHAR sCLSID[7] = {'C','L','S','I','D','\\','\0'};
 111         WCHAR   sClassID[60];
 112         const WCHAR sInProcServer32[16] ={'\\','I','n','p','r','o','c','S','e','r','v','e','r','3','2','\0'};
 113         const WCHAR sLoadWithoutCOM[15] ={'L','o','a','d','W','i','t','h','o','u','t','C','O','M','\0'};
 114         WCHAR   sDllPath[MAX_PATH];
 115         HKEY    hKey = 0;
 116         DWORD   dwSize;
 117         IClassFactory * pcf = NULL;
 118
 119         if(!ppv) return E_POINTER;
 120         *ppv=NULL;
 121
 122         /* if the clsid is a string, convert it */
 123         if (!clsid)
 124         {
 125           if (!aclsid) return REGDB_E_CLASSNOTREG;
 126           SHCLSIDFromStringW(aclsid, &iid);
 127           myclsid = &iid;
 128         }
 129
 130         TRACE("(%p,%s,unk:%p,%s,%p)\n",
 131                 aclsid,shdebugstr_guid(myclsid),pUnkOuter,shdebugstr_guid(refiid),ppv);
 132
 133         if (SUCCEEDED(DllGetClassObject(myclsid, &IID_IClassFactory,(LPVOID*)&pcf)))
 134         {
 135             hres = IClassFactory_CreateInstance(pcf, pUnkOuter, refiid, ppv);
 136             IClassFactory_Release(pcf);
 137             goto end;
 138         }
 139
 140         /* we look up the dll path in the registry */
 141         SHStringFromGUIDW(myclsid, sClassID, sizeof(sClassID)/sizeof(WCHAR));
 142         lstrcpyW(sKeyName, sCLSID);
 143         lstrcatW(sKeyName, sClassID);
 144         lstrcatW(sKeyName, sInProcServer32);
 145
 146         if (RegOpenKeyExW(HKEY_CLASSES_ROOT, sKeyName, 0, KEY_READ, &hKey))
 147             return E_ACCESSDENIED;
 148
 149         /* if a special registry key is set, we load a shell extension without help of OLE32 */
 150         if (!SHQueryValueExW(hKey, sLoadWithoutCOM, 0, 0, 0, 0))
 151         {
 152             /* load an external dll without ole32 */
 153             HANDLE hLibrary;
 154             typedef HRESULT (CALLBACK *DllGetClassObjectFunc)(REFCLSID clsid, REFIID iid, LPVOID *ppv);
 155             DllGetClassObjectFunc DllGetClassObject;
 156
 157             dwSize = sizeof(sDllPath);
 158             SHQueryValueExW(hKey, NULL, 0,0, sDllPath, &dwSize );
 159
 160             if ((hLibrary = LoadLibraryExW(sDllPath, 0, LOAD_WITH_ALTERED_SEARCH_PATH)) == 0) {
 161                 ERR("couldn't load InprocServer32 dll %s\n", debugstr_w(sDllPath));
 162                 hres = E_ACCESSDENIED;
 163                 goto end;
 164             } else if (!(DllGetClassObject = (DllGetClassObjectFunc)GetProcAddress(hLibrary, "DllGetClassObject"))) {
 165                 ERR("couldn't find function DllGetClassObject in %s\n", debugstr_w(sDllPath));
 166                 FreeLibrary( hLibrary );
 167                 hres = E_ACCESSDENIED;
 168                 goto end;
 169             } else if (FAILED(hres = DllGetClassObject(myclsid, &IID_IClassFactory, (LPVOID*)&pcf))) {
 170                     TRACE("GetClassObject failed 0x%08x\n", hres);
 171                     goto end;
 172             }
 173
 174             hres = IClassFactory_CreateInstance(pcf, pUnkOuter, refiid, ppv);
 175             IClassFactory_Release(pcf);
 176         } else {
 177
 178             /* load an external dll in the usual way */
 179             hres = CoCreateInstance(myclsid, pUnkOuter, CLSCTX_INPROC_SERVER, refiid, ppv);
 180         }
 181
 182 end:
 183         if (hKey) RegCloseKey(hKey);
 184         if(hres!=S_OK)
 185         {
 186           ERR("failed (0x%08x) to create CLSID:%s IID:%s\n",
 187               hres, shdebugstr_guid(myclsid), shdebugstr_guid(refiid));
 188           ERR("class not found in registry\n");
 189         }
 190
 191         TRACE("-- instance: %p\n",*ppv);
 192         return hres;
 193 }
 194
 195 /*************************************************************************
 196  * DllGetClassObject     [SHELL32.@]
 197  * SHDllGetClassObject   [SHELL32.128]
 198  */
 199 HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID iid, LPVOID *ppv)
 200 {
 201         HRESULT hres = E_OUTOFMEMORY;
 202         IClassFactory * pcf = NULL;
 203         int i;
 204
 205         TRACE("CLSID:%s,IID:%s\n",shdebugstr_guid(rclsid),shdebugstr_guid(iid));
 206
 207         if (!ppv) return E_INVALIDARG;
 208         *ppv = NULL;
 209
 210         /* search our internal interface table */
 211         for(i=0;InterfaceTable[i].riid;i++) {
 212             if(IsEqualIID(InterfaceTable[i].riid, rclsid)) {
 213                 TRACE("index[%u]\n", i);
 214                 pcf = IDefClF_fnConstructor(InterfaceTable[i].lpfnCI, NULL, NULL);
 215             }
 216         }
 217
 218         if (!pcf) {
 219             FIXME("failed for CLSID=%s\n", shdebugstr_guid(rclsid));
 220             return CLASS_E_CLASSNOTAVAILABLE;
 221         }
 222
 223         hres = IClassFactory_QueryInterface(pcf, iid, ppv);
 224         IClassFactory_Release(pcf);
 225
 226         TRACE("-- pointer to class factory: %p\n",*ppv);
 227         return hres;
 228 }
 229
 230 /*************************************************************************
 231  * SHCLSIDFromString                            [SHELL32.147]
 232  *
 233  * Under Windows 9x this was an ANSI version of CLSIDFromString. It also allowed
 234  * to avoid dependency on ole32.dll (see SHLoadOLE for details).
 235  *
 236  * Under Windows NT/2000/XP this is equivalent to CLSIDFromString
 237  *
 238  * NOTES
 239  *     exported by ordinal
 240  *
 241  * SEE ALSO
 242  *     CLSIDFromString, SHLoadOLE
 243  */
 244 DWORD WINAPI SHCLSIDFromStringA (LPCSTR clsid, CLSID *id)
 245 {
 246     WCHAR buffer[40];
 247     TRACE("(%p(%s) %p)\n", clsid, clsid, id);
 248     if (!MultiByteToWideChar( CP_ACP, 0, clsid, -1, buffer, sizeof(buffer)/sizeof(WCHAR) ))
 249         return CO_E_CLASSSTRING;
 250     return CLSIDFromString( buffer, id );
 251 }
 252 DWORD WINAPI SHCLSIDFromStringW (LPCWSTR clsid, CLSID *id)
 253 {
 254         TRACE("(%p(%s) %p)\n", clsid, debugstr_w(clsid), id);
 255         return CLSIDFromString((LPWSTR)clsid, id);
 256 }
 257 DWORD WINAPI SHCLSIDFromStringAW (LPCVOID clsid, CLSID *id)
 258 {
 259         if (SHELL_OsIsUnicode())
 260           return SHCLSIDFromStringW (clsid, id);
 261         return SHCLSIDFromStringA (clsid, id);
 262 }
 263
 264 /*************************************************************************
 265  *                       SHGetMalloc                    [SHELL32.@]
 266  *
 267  * Equivalent to CoGetMalloc(MEMCTX_TASK, ...). Under Windows 9x this function
 268  * could use the shell32 built-in "mini-COM" without the need to load ole32.dll -
 269  * see SHLoadOLE for details.
 270  *
 271  * PARAMS
 272  *  lpmal [O] Destination for IMalloc interface.
 273  *
 274  * RETURNS
 275  *  Success: S_OK. lpmal contains the shells IMalloc interface.
 276  *  Failure. An HRESULT error code.
 277  *
 278  * SEE ALSO
 279  *  CoGetMalloc, SHLoadOLE
 280  */
 281 HRESULT WINAPI SHGetMalloc(LPMALLOC *lpmal)
 282 {
 283         TRACE("(%p)\n", lpmal);
 284         return CoGetMalloc(MEMCTX_TASK, lpmal);
 285 }
 286
 287 /*************************************************************************
 288  * SHAlloc                                      [SHELL32.196]
 289  *
 290  * Equivalent to CoTaskMemAlloc. Under Windows 9x this function could use
 291  * the shell32 built-in "mini-COM" without the need to load ole32.dll -
 292  * see SHLoadOLE for details.
 293  *
 294  * NOTES
 295  *     exported by ordinal
 296  *
 297  * SEE ALSO
 298  *     CoTaskMemAlloc, SHLoadOLE
 299  */
 300 LPVOID WINAPI SHAlloc(DWORD len)
 301 {
 302         LPVOID ret;
 303
 304         ret = CoTaskMemAlloc(len);
 305         TRACE("%u bytes at %p\n",len, ret);
 306         return ret;
 307 }
 308
 309 /*************************************************************************
 310  * SHFree                                       [SHELL32.195]
 311  *
 312  * Equivalent to CoTaskMemFree. Under Windows 9x this function could use
 313  * the shell32 built-in "mini-COM" without the need to load ole32.dll -
 314  * see SHLoadOLE for details.
 315  *
 316  * NOTES
 317  *     exported by ordinal
 318  *
 319  * SEE ALSO
 320  *     CoTaskMemFree, SHLoadOLE
 321  */
 322 void WINAPI SHFree(LPVOID pv)
 323 {
 324         TRACE("%p\n",pv);
 325         CoTaskMemFree(pv);
 326 }
 327
 328 /*************************************************************************
 329  * SHGetDesktopFolder                   [SHELL32.@]
 330  */
 331 HRESULT WINAPI SHGetDesktopFolder(IShellFolder **psf)
 332 {
 333         HRESULT hres = S_OK;
 334         TRACE("\n");
 335
 336         if(!psf) return E_INVALIDARG;
 337         *psf = NULL;
 338         hres = ISF_Desktop_Constructor(NULL, &IID_IShellFolder,(LPVOID*)psf);
 339
 340         TRACE("-- %p->(%p)\n",psf, *psf);
 341         return hres;
 342 }
 343 /**************************************************************************
 344  * Default ClassFactory Implementation
 345  *
 346  * SHCreateDefClassObject
 347  *
 348  * NOTES
 349  *  Helper function for dlls without their own classfactory.
 350  *  A generic classfactory is returned.
 351  *  When the CreateInstance of the cf is called the callback is executed.
 352  */
 353
 354 typedef struct
 355 {
 356     const IClassFactoryVtbl    *lpVtbl;
 357     LONG                        ref;
 358     CLSID                       *rclsid;
 359     LPFNCREATEINSTANCE          lpfnCI;
 360     const IID *                 riidInst;
 361     LONG *                      pcRefDll; /* pointer to refcounter in external dll (ugrrr...) */
 362 } IDefClFImpl;
 363
 364 static const IClassFactoryVtbl dclfvt;
 365
 366 /**************************************************************************
 367  *  IDefClF_fnConstructor
 368  */
 369
 370 static IClassFactory * IDefClF_fnConstructor(LPFNCREATEINSTANCE lpfnCI, PLONG pcRefDll, REFIID riidInst)
 371 {
 372         IDefClFImpl* lpclf;
 373
 374         lpclf = HeapAlloc(GetProcessHeap(),0,sizeof(IDefClFImpl));
 375         lpclf->ref = 1;
 376         lpclf->lpVtbl = &dclfvt;
 377         lpclf->lpfnCI = lpfnCI;
 378         lpclf->pcRefDll = pcRefDll;
 379
 380         if (pcRefDll) InterlockedIncrement(pcRefDll);
 381         lpclf->riidInst = riidInst;
 382
 383         TRACE("(%p)%s\n",lpclf, shdebugstr_guid(riidInst));
 384         return (LPCLASSFACTORY)lpclf;
 385 }
 386 /**************************************************************************
 387  *  IDefClF_fnQueryInterface
 388  */
 389 static HRESULT WINAPI IDefClF_fnQueryInterface(
 390   LPCLASSFACTORY iface, REFIID riid, LPVOID *ppvObj)
 391 {
 392         IDefClFImpl *This = (IDefClFImpl *)iface;
 393
 394         TRACE("(%p)->(%s)\n",This,shdebugstr_guid(riid));
 395
 396         *ppvObj = NULL;
 397
 398         if(IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IClassFactory)) {
 399           *ppvObj = This;
 400           InterlockedIncrement(&This->ref);
 401           return S_OK;
 402         }
 403
 404         TRACE("-- E_NOINTERFACE\n");
 405         return E_NOINTERFACE;
 406 }
 407 /******************************************************************************
 408  * IDefClF_fnAddRef
 409  */
 410 static ULONG WINAPI IDefClF_fnAddRef(LPCLASSFACTORY iface)
 411 {
 412         IDefClFImpl *This = (IDefClFImpl *)iface;
 413         ULONG refCount = InterlockedIncrement(&This->ref);
 414
 415         TRACE("(%p)->(count=%u)\n", This, refCount - 1);
 416
 417         return refCount;
 418 }
 419 /******************************************************************************
 420  * IDefClF_fnRelease
 421  */
 422 static ULONG WINAPI IDefClF_fnRelease(LPCLASSFACTORY iface)
 423 {
 424         IDefClFImpl *This = (IDefClFImpl *)iface;
 425         ULONG refCount = InterlockedDecrement(&This->ref);
 426
 427         TRACE("(%p)->(count=%u)\n", This, refCount + 1);
 428
 429         if (!refCount)
 430         {
 431           if (This->pcRefDll) InterlockedDecrement(This->pcRefDll);
 432
 433           TRACE("-- destroying IClassFactory(%p)\n",This);
 434           HeapFree(GetProcessHeap(),0,This);
 435           return 0;
 436         }
 437         return refCount;
 438 }
 439 /******************************************************************************
 440  * IDefClF_fnCreateInstance
 441  */
 442 static HRESULT WINAPI IDefClF_fnCreateInstance(
 443   LPCLASSFACTORY iface, LPUNKNOWN pUnkOuter, REFIID riid, LPVOID *ppvObject)
 444 {
 445         IDefClFImpl *This = (IDefClFImpl *)iface;
 446
 447         TRACE("%p->(%p,%s,%p)\n",This,pUnkOuter,shdebugstr_guid(riid),ppvObject);
 448
 449         *ppvObject = NULL;
 450
 451         if ( This->riidInst==NULL ||
 452              IsEqualCLSID(riid, This->riidInst) ||
 453              IsEqualCLSID(riid, &IID_IUnknown) )
 454         {
 455           return This->lpfnCI(pUnkOuter, riid, ppvObject);
 456         }
 457
 458         ERR("unknown IID requested %s\n",shdebugstr_guid(riid));
 459         return E_NOINTERFACE;
 460 }
 461 /******************************************************************************
 462  * IDefClF_fnLockServer
 463  */
 464 static HRESULT WINAPI IDefClF_fnLockServer(LPCLASSFACTORY iface, BOOL fLock)
 465 {
 466         IDefClFImpl *This = (IDefClFImpl *)iface;
 467         TRACE("%p->(0x%x), not implemented\n",This, fLock);
 468         return E_NOTIMPL;
 469 }
 470
 471 static const IClassFactoryVtbl dclfvt =
 472 {
 473     IDefClF_fnQueryInterface,
 474     IDefClF_fnAddRef,
 475   IDefClF_fnRelease,
 476   IDefClF_fnCreateInstance,
 477   IDefClF_fnLockServer
 478 };
 479
 480 /******************************************************************************
 481  * SHCreateDefClassObject                       [SHELL32.70]
 482  */
 483 HRESULT WINAPI SHCreateDefClassObject(
 484         REFIID  riid,
 485         LPVOID* ppv,
 486         LPFNCREATEINSTANCE lpfnCI,      /* [in] create instance callback entry */
 487         LPDWORD pcRefDll,               /* [in/out] ref count of the dll */
 488         REFIID  riidInst)               /* [in] optional interface to the instance */
 489 {
 490         IClassFactory * pcf;
 491
 492         TRACE("%s %p %p %p %s\n",
 493               shdebugstr_guid(riid), ppv, lpfnCI, pcRefDll, shdebugstr_guid(riidInst));
 494
 495         if (! IsEqualCLSID(riid, &IID_IClassFactory) ) return E_NOINTERFACE;
 496         if (! (pcf = IDefClF_fnConstructor(lpfnCI, (PLONG)pcRefDll, riidInst))) return E_OUTOFMEMORY;
 497         *ppv = pcf;
 498         return NOERROR;
 499 }
 500
 501 /*************************************************************************
 502  *  DragAcceptFiles             [SHELL32.@]
 503  */
 504 void WINAPI DragAcceptFiles(HWND hWnd, BOOL b)
 505 {
 506         LONG exstyle;
 507
 508         if( !IsWindow(hWnd) ) return;
 509         exstyle = GetWindowLongA(hWnd,GWL_EXSTYLE);
 510         if (b)
 511           exstyle |= WS_EX_ACCEPTFILES;
 512         else
 513           exstyle &= ~WS_EX_ACCEPTFILES;
 514         SetWindowLongA(hWnd,GWL_EXSTYLE,exstyle);
 515 }
 516
 517 /*************************************************************************
 518  * DragFinish           [SHELL32.@]
 519  */
 520 void WINAPI DragFinish(HDROP h)
 521 {
 522         TRACE("\n");
 523         GlobalFree(h);
 524 }
 525
 526 /*************************************************************************
 527  * DragQueryPoint               [SHELL32.@]
 528  */
 529 BOOL WINAPI DragQueryPoint(HDROP hDrop, POINT *p)
 530 {
 531         DROPFILES *lpDropFileStruct;
 532         BOOL bRet;
 533
 534         TRACE("\n");
 535
 536         lpDropFileStruct = GlobalLock(hDrop);
 537
 538         *p = lpDropFileStruct->pt;
 539         bRet = lpDropFileStruct->fNC;
 540
 541         GlobalUnlock(hDrop);
 542         return bRet;
 543 }
 544
 545 /*************************************************************************
 546  *  DragQueryFileA              [SHELL32.@]
 547  *  DragQueryFile               [SHELL32.@]
 548  */
 549 UINT WINAPI DragQueryFileA(
 550         HDROP hDrop,
 551         UINT lFile,
 552         LPSTR lpszFile,
 553         UINT lLength)
 554 {
 555         LPSTR lpDrop;
 556         UINT i = 0;
 557         DROPFILES *lpDropFileStruct = GlobalLock(hDrop);
 558
 559         TRACE("(%p, %x, %p, %u)\n",     hDrop,lFile,lpszFile,lLength);
 560
 561         if(!lpDropFileStruct) goto end;
 562
 563         lpDrop = (LPSTR) lpDropFileStruct + lpDropFileStruct->pFiles;
 564
 565         if(lpDropFileStruct->fWide) {
 566             LPWSTR lpszFileW = NULL;
 567
 568             if(lpszFile) {
 569                 lpszFileW = HeapAlloc(GetProcessHeap(), 0, lLength*sizeof(WCHAR));
 570                 if(lpszFileW == NULL) {
 571                     goto end;
 572                 }
 573             }
 574             i = DragQueryFileW(hDrop, lFile, lpszFileW, lLength);
 575
 576             if(lpszFileW) {
 577                 WideCharToMultiByte(CP_ACP, 0, lpszFileW, -1, lpszFile, lLength, 0, NULL);
 578                 HeapFree(GetProcessHeap(), 0, lpszFileW);
 579             }
 580             goto end;
 581         }
 582
 583         while (i++ < lFile)
 584         {
 585           while (*lpDrop++); /* skip filename */
 586           if (!*lpDrop)
 587           {
 588             i = (lFile == 0xFFFFFFFF) ? i : 0;
 589             goto end;
 590           }
 591         }
 592
 593         i = strlen(lpDrop);
 594         if (!lpszFile ) goto end;   /* needed buffer size */
 595         lstrcpynA (lpszFile, lpDrop, lLength);
 596 end:
 597         GlobalUnlock(hDrop);
 598         return i;
 599 }
 600
 601 /*************************************************************************
 602  *  DragQueryFileW              [SHELL32.@]
 603  */
 604 UINT WINAPI DragQueryFileW(
 605         HDROP hDrop,
 606         UINT lFile,
 607         LPWSTR lpszwFile,
 608         UINT lLength)
 609 {
 610         LPWSTR lpwDrop;
 611         UINT i = 0;
 612         DROPFILES *lpDropFileStruct = GlobalLock(hDrop);
 613
 614         TRACE("(%p, %x, %p, %u)\n", hDrop,lFile,lpszwFile,lLength);
 615
 616         if(!lpDropFileStruct) goto end;
 617
 618         lpwDrop = (LPWSTR) ((LPSTR)lpDropFileStruct + lpDropFileStruct->pFiles);
 619
 620         if(lpDropFileStruct->fWide == FALSE) {
 621             LPSTR lpszFileA = NULL;
 622
 623             if(lpszwFile) {
 624                 lpszFileA = HeapAlloc(GetProcessHeap(), 0, lLength);
 625                 if(lpszFileA == NULL) {
 626                     goto end;
 627                 }
 628             }
 629             i = DragQueryFileA(hDrop, lFile, lpszFileA, lLength);
 630
 631             if(lpszFileA) {
 632                 MultiByteToWideChar(CP_ACP, 0, lpszFileA, -1, lpszwFile, lLength);
 633                 HeapFree(GetProcessHeap(), 0, lpszFileA);
 634             }
 635             goto end;
 636         }
 637
 638         i = 0;
 639         while (i++ < lFile)
 640         {
 641           while (*lpwDrop++); /* skip filename */
 642           if (!*lpwDrop)
 643           {
 644             i = (lFile == 0xFFFFFFFF) ? i : 0;
 645             goto end;
 646           }
 647         }
 648
 649         i = strlenW(lpwDrop);
 650         if ( !lpszwFile) goto end;   /* needed buffer size */
 651         lstrcpynW (lpszwFile, lpwDrop, lLength);
 652 end:
 653         GlobalUnlock(hDrop);
 654         return i;
 655 }