dlls/quartz/main.c

   1 /*
   2  * Exported APIs.
   3  *
   4  * hidenori@a2.ctktv.ne.jp
   5  */
   6
   7 #include "config.h"
   8
   9 #include "windef.h"
  10 #include "winerror.h"
  11 #include "winbase.h"
  12 #include "wingdi.h"
  13 #include "winuser.h"
  14 #include "winnls.h"
  15 #include "ole2.h"
  16 #include "wine/obj_oleaut.h"
  17 #include "strmif.h"
  18 #include "control.h"
  19 #include "uuids.h"
  20 #include "errors.h"
  21
  22 #include "debugtools.h"
  23 DEFAULT_DEBUG_CHANNEL(quartz);
  24
  25 #include "quartz_private.h"
  26 #include "fgraph.h"
  27 #include "sysclock.h"
  28 #include "memalloc.h"
  29 #include "devenum.h"
  30 #include "fmap.h"
  31 #include "fmap2.h"
  32 #include "seekpass.h"
  33
  34
  35 typedef struct QUARTZ_CLASSENTRY
  36 {
  37         const CLSID*    pclsid;
  38         QUARTZ_pCreateIUnknown  pCreateIUnk;
  39 } QUARTZ_CLASSENTRY;
  40
  41
  42 static HRESULT WINAPI
  43 IClassFactory_fnQueryInterface(LPCLASSFACTORY iface,REFIID riid,LPVOID *ppobj);
  44 static ULONG WINAPI IClassFactory_fnAddRef(LPCLASSFACTORY iface);
  45 static ULONG WINAPI IClassFactory_fnRelease(LPCLASSFACTORY iface);
  46 static HRESULT WINAPI IClassFactory_fnCreateInstance(LPCLASSFACTORY iface,LPUNKNOWN pOuter,REFIID riid,LPVOID *ppobj);
  47 static HRESULT WINAPI IClassFactory_fnLockServer(LPCLASSFACTORY iface,BOOL dolock);
  48
  49 static ICOM_VTABLE(IClassFactory) iclassfact =
  50 {
  51         ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
  52         IClassFactory_fnQueryInterface,
  53         IClassFactory_fnAddRef,
  54         IClassFactory_fnRelease,
  55         IClassFactory_fnCreateInstance,
  56         IClassFactory_fnLockServer
  57 };
  58
  59 typedef struct
  60 {
  61         /* IUnknown fields */
  62         ICOM_VFIELD(IClassFactory);
  63         LONG    ref;
  64         /* IClassFactory fields */
  65         const QUARTZ_CLASSENTRY* pEntry;
  66 } IClassFactoryImpl;
  67
  68 static const QUARTZ_CLASSENTRY QUARTZ_ClassList[] =
  69 {
  70         { &CLSID_FilterGraph, &QUARTZ_CreateFilterGraph },
  71         { &CLSID_SystemClock, &QUARTZ_CreateSystemClock },
  72         { &CLSID_MemoryAllocator, &QUARTZ_CreateMemoryAllocator },
  73         { &CLSID_SystemDeviceEnum, &QUARTZ_CreateSystemDeviceEnum },
  74         { &CLSID_FilterMapper, &QUARTZ_CreateFilterMapper },
  75         { &CLSID_FilterMapper2, &QUARTZ_CreateFilterMapper2 },
  76         { &CLSID_SeekingPassThru, &QUARTZ_CreateSeekingPassThru },
  77         { NULL, NULL },
  78 };
  79
  80 /* per-process variables */
  81 static CRITICAL_SECTION csHeap;
  82 static DWORD dwClassObjRef;
  83 static HANDLE hDLLHeap;
  84
  85 void* QUARTZ_AllocObj( DWORD dwSize )
  86 {
  87         void*   pv;
  88
  89         EnterCriticalSection( &csHeap );
  90         dwClassObjRef ++;
  91         pv = HeapAlloc( hDLLHeap, 0, dwSize );
  92         if ( pv == NULL )
  93                 dwClassObjRef --;
  94         LeaveCriticalSection( &csHeap );
  95
  96         return pv;
  97 }
  98
  99 void QUARTZ_FreeObj( void* pobj )
 100 {
 101         EnterCriticalSection( &csHeap );
 102         HeapFree( hDLLHeap, 0, pobj );
 103         dwClassObjRef --;
 104         LeaveCriticalSection( &csHeap );
 105 }
 106
 107 void* QUARTZ_AllocMem( DWORD dwSize )
 108 {
 109         return HeapAlloc( hDLLHeap, 0, dwSize );
 110 }
 111
 112 void QUARTZ_FreeMem( void* pMem )
 113 {
 114         HeapFree( hDLLHeap, 0, pMem );
 115 }
 116
 117 void* QUARTZ_ReallocMem( void* pMem, DWORD dwSize )
 118 {
 119         if ( pMem == NULL )
 120                 return QUARTZ_AllocMem( dwSize );
 121
 122         return HeapReAlloc( hDLLHeap, 0, pMem, dwSize );
 123 }
 124
 125 static
 126 LPWSTR QUARTZ_strncpyAtoW( LPWSTR lpwstr, LPCSTR lpstr, INT wbuflen )
 127 {
 128         INT     len;
 129
 130         len = MultiByteToWideChar( CP_ACP, 0, lpstr, -1, lpwstr, wbuflen );
 131         if ( len == 0 )
 132                 *lpwstr = 0;
 133         return lpwstr;
 134 }
 135
 136
 137 /************************************************************************/
 138
 139 static HRESULT WINAPI
 140 IClassFactory_fnQueryInterface(LPCLASSFACTORY iface,REFIID riid,LPVOID *ppobj)
 141 {
 142         ICOM_THIS(IClassFactoryImpl,iface);
 143
 144         TRACE("(%p)->(%p,%p)\n",This,riid,ppobj);
 145         if ( ( IsEqualGUID( &IID_IUnknown, riid ) ) ||
 146              ( IsEqualGUID( &IID_IClassFactory, riid ) ) )
 147         {
 148                 *ppobj = iface;
 149                 IClassFactory_AddRef(iface);
 150                 return S_OK;
 151         }
 152
 153         return E_NOINTERFACE;
 154 }
 155
 156 static ULONG WINAPI IClassFactory_fnAddRef(LPCLASSFACTORY iface)
 157 {
 158         ICOM_THIS(IClassFactoryImpl,iface);
 159
 160         TRACE("(%p)->()\n",This);
 161
 162         return InterlockedExchangeAdd(&(This->ref),1) + 1;
 163 }
 164
 165 static ULONG WINAPI IClassFactory_fnRelease(LPCLASSFACTORY iface)
 166 {
 167         ICOM_THIS(IClassFactoryImpl,iface);
 168         LONG    ref;
 169
 170         TRACE("(%p)->()\n",This);
 171         ref = InterlockedExchangeAdd(&(This->ref),-1) - 1;
 172         if ( ref > 0 )
 173                 return (ULONG)ref;
 174
 175         QUARTZ_FreeObj(This);
 176         return 0;
 177 }
 178
 179 static HRESULT WINAPI IClassFactory_fnCreateInstance(LPCLASSFACTORY iface,LPUNKNOWN pOuter,REFIID riid,LPVOID *ppobj)
 180 {
 181         ICOM_THIS(IClassFactoryImpl,iface);
 182         HRESULT hr;
 183         IUnknown*       punk;
 184
 185         TRACE("(%p)->(%p,%s,%p)\n",This,pOuter,debugstr_guid(riid),ppobj);
 186
 187         if ( ppobj == NULL )
 188                 return E_POINTER;
 189         if ( pOuter != NULL && !IsEqualGUID( riid, &IID_IUnknown ) )
 190                 return CLASS_E_NOAGGREGATION;
 191
 192         *ppobj = NULL;
 193
 194         hr = (*This->pEntry->pCreateIUnk)(pOuter,(void**)&punk);
 195         if ( hr != S_OK )
 196                 return hr;
 197
 198         hr = IUnknown_QueryInterface(punk,riid,ppobj);
 199         IUnknown_Release(punk);
 200
 201         return hr;
 202 }
 203
 204 static HRESULT WINAPI IClassFactory_fnLockServer(LPCLASSFACTORY iface,BOOL dolock)
 205 {
 206         ICOM_THIS(IClassFactoryImpl,iface);
 207         HRESULT hr;
 208
 209         TRACE("(%p)->(%d)\n",This,dolock);
 210         if (dolock)
 211                 hr = IClassFactory_AddRef(iface);
 212         else
 213                 hr = IClassFactory_Release(iface);
 214
 215         return hr;
 216 }
 217
 218
 219
 220 static HRESULT IClassFactory_Alloc( const CLSID* pclsid, void** ppobj )
 221 {
 222         const QUARTZ_CLASSENTRY*        pEntry;
 223         IClassFactoryImpl*      pImpl;
 224
 225         TRACE( "(%s,%p)\n", debugstr_guid(pclsid), ppobj );
 226
 227         pEntry = QUARTZ_ClassList;
 228         while ( pEntry->pclsid != NULL )
 229         {
 230                 if ( IsEqualGUID( pclsid, pEntry->pclsid ) )
 231                         goto found;
 232                 pEntry ++;
 233         }
 234
 235         return CLASS_E_CLASSNOTAVAILABLE;
 236 found:
 237         pImpl = (IClassFactoryImpl*)QUARTZ_AllocObj( sizeof(IClassFactoryImpl) );
 238         if ( pImpl == NULL )
 239                 return E_OUTOFMEMORY;
 240
 241         TRACE( "allocated successfully.\n" );
 242
 243         ICOM_VTBL(pImpl) = &iclassfact;
 244         pImpl->ref = 1;
 245         pImpl->pEntry = pEntry;
 246
 247         *ppobj = (void*)pImpl;
 248         return S_OK;
 249 }
 250
 251
 252 /***********************************************************************
 253  *              QUARTZ_InitProcess (internal)
 254  */
 255 static BOOL QUARTZ_InitProcess( void )
 256 {
 257         TRACE("()\n");
 258
 259         dwClassObjRef = 0;
 260         hDLLHeap = (HANDLE)NULL;
 261         InitializeCriticalSection( &csHeap );
 262
 263         hDLLHeap = HeapCreate( 0, 0x10000, 0 );
 264         if ( hDLLHeap == (HANDLE)NULL )
 265                 return FALSE;
 266
 267         return TRUE;
 268 }
 269
 270 /***********************************************************************
 271  *              QUARTZ_UninitProcess (internal)
 272  */
 273 static void QUARTZ_UninitProcess( void )
 274 {
 275         TRACE("()\n");
 276
 277         if ( dwClassObjRef != 0 )
 278                 ERR( "you must release some objects allocated from quartz.\n" );
 279         if ( hDLLHeap != (HANDLE)NULL )
 280         {
 281                 HeapDestroy( hDLLHeap );
 282                 hDLLHeap = (HANDLE)NULL;
 283         }
 284         DeleteCriticalSection( &csHeap );
 285 }
 286
 287 /***********************************************************************
 288  *              QUARTZ_DllMain
 289  */
 290 BOOL WINAPI QUARTZ_DllMain(
 291         HINSTANCE hInstDLL,
 292         DWORD fdwReason,
 293         LPVOID lpvReserved )
 294 {
 295         switch ( fdwReason )
 296         {
 297         case DLL_PROCESS_ATTACH:
 298                 if ( !QUARTZ_InitProcess() )
 299                         return FALSE;
 300                 break;
 301         case DLL_PROCESS_DETACH:
 302                 QUARTZ_UninitProcess();
 303                 break;
 304         case DLL_THREAD_ATTACH:
 305                 break;
 306         case DLL_THREAD_DETACH:
 307                 break;
 308         }
 309
 310         return TRUE;
 311 }
 312
 313
 314 /***********************************************************************
 315  *              DllCanUnloadNow (QUARTZ.@)
 316  *
 317  * RETURNS
 318  *    Success: S_OK
 319  *    Failure: S_FALSE
 320  */
 321 HRESULT WINAPI QUARTZ_DllCanUnloadNow(void)
 322 {
 323         HRESULT hr;
 324
 325         EnterCriticalSection( &csHeap );
 326         hr = ( dwClassObjRef == 0 ) ? S_OK : S_FALSE;
 327         LeaveCriticalSection( &csHeap );
 328
 329         return hr;
 330 }
 331
 332 /***********************************************************************
 333  *              DllGetClassObject (QUARTZ.@)
 334  */
 335 HRESULT WINAPI QUARTZ_DllGetClassObject(
 336                 const CLSID* pclsid,const IID* piid,void** ppv)
 337 {
 338         *ppv = NULL;
 339         if ( IsEqualCLSID( &IID_IUnknown, piid ) ||
 340              IsEqualCLSID( &IID_IClassFactory, piid ) )
 341         {
 342                 return IClassFactory_Alloc( pclsid, ppv );
 343         }
 344
 345         return CLASS_E_CLASSNOTAVAILABLE;
 346 }
 347
 348 /***********************************************************************
 349  *              DllRegisterServer (QUARTZ.@)
 350  */
 351
 352 HRESULT WINAPI QUARTZ_DllRegisterServer( void )
 353 {
 354         FIXME( "(): stub\n" );
 355         return E_FAIL;
 356 }
 357
 358 /***********************************************************************
 359  *              DllUnregisterServer (QUARTZ.@)
 360  */
 361
 362 HRESULT WINAPI QUARTZ_DllUnregisterServer( void )
 363 {
 364         FIXME( "(): stub\n" );
 365         return E_FAIL;
 366 }
 367
 368 /**************************************************************************/
 369 /**************************************************************************/
 370
 371 /* FIXME - all string should be defined in the resource of quartz. */
 372
 373 static LPCSTR hresult_to_string( HRESULT hr )
 374 {
 375         switch ( hr )
 376         {
 377         #define ENTRY(x)        case x: return (const char*)#x
 378         /* some known codes */
 379         ENTRY(S_OK);
 380         ENTRY(S_FALSE);
 381         ENTRY(E_FAIL);
 382         ENTRY(E_POINTER);
 383         ENTRY(E_NOTIMPL);
 384         ENTRY(E_NOINTERFACE);
 385         ENTRY(E_OUTOFMEMORY);
 386         ENTRY(CLASS_E_CLASSNOTAVAILABLE);
 387         ENTRY(CLASS_E_NOAGGREGATION);
 388
 389         /* vfwmsgs.h */
 390         ENTRY(VFW_S_NO_MORE_ITEMS);
 391         ENTRY(VFW_E_BAD_KEY);
 392         ENTRY(VFW_E_INVALIDMEDIATYPE);
 393         ENTRY(VFW_E_INVALIDSUBTYPE);
 394         ENTRY(VFW_E_NEED_OWNER);
 395         ENTRY(VFW_E_ENUM_OUT_OF_SYNC);
 396         ENTRY(VFW_E_ALREADY_CONNECTED);
 397         ENTRY(VFW_E_FILTER_ACTIVE);
 398         ENTRY(VFW_E_NO_TYPES);
 399         ENTRY(VFW_E_NO_ACCEPTABLE_TYPES);
 400         ENTRY(VFW_E_INVALID_DIRECTION);
 401         ENTRY(VFW_E_NOT_CONNECTED);
 402         ENTRY(VFW_E_NO_ALLOCATOR);
 403         ENTRY(VFW_E_RUNTIME_ERROR);
 404         ENTRY(VFW_E_BUFFER_NOTSET);
 405         ENTRY(VFW_E_BUFFER_OVERFLOW);
 406         ENTRY(VFW_E_BADALIGN);
 407         ENTRY(VFW_E_ALREADY_COMMITTED);
 408         ENTRY(VFW_E_BUFFERS_OUTSTANDING);
 409         ENTRY(VFW_E_NOT_COMMITTED);
 410         ENTRY(VFW_E_SIZENOTSET);
 411         ENTRY(VFW_E_NO_CLOCK);
 412         ENTRY(VFW_E_NO_SINK);
 413         ENTRY(VFW_E_NO_INTERFACE);
 414         ENTRY(VFW_E_NOT_FOUND);
 415         ENTRY(VFW_E_CANNOT_CONNECT);
 416         ENTRY(VFW_E_CANNOT_RENDER);
 417         ENTRY(VFW_E_CHANGING_FORMAT);
 418         ENTRY(VFW_E_NO_COLOR_KEY_SET);
 419         ENTRY(VFW_E_NOT_OVERLAY_CONNECTION);
 420         ENTRY(VFW_E_NOT_SAMPLE_CONNECTION);
 421         ENTRY(VFW_E_PALETTE_SET);
 422         ENTRY(VFW_E_COLOR_KEY_SET);
 423         ENTRY(VFW_E_NO_COLOR_KEY_FOUND);
 424         ENTRY(VFW_E_NO_PALETTE_AVAILABLE);
 425         ENTRY(VFW_E_NO_DISPLAY_PALETTE);
 426         ENTRY(VFW_E_TOO_MANY_COLORS);
 427         ENTRY(VFW_E_STATE_CHANGED);
 428         ENTRY(VFW_E_NOT_STOPPED);
 429         ENTRY(VFW_E_NOT_PAUSED);
 430         ENTRY(VFW_E_NOT_RUNNING);
 431         ENTRY(VFW_E_WRONG_STATE);
 432         ENTRY(VFW_E_START_TIME_AFTER_END);
 433         ENTRY(VFW_E_INVALID_RECT);
 434         ENTRY(VFW_E_TYPE_NOT_ACCEPTED);
 435         ENTRY(VFW_E_SAMPLE_REJECTED);
 436         ENTRY(VFW_E_SAMPLE_REJECTED_EOS);
 437         ENTRY(VFW_S_DUPLICATE_NAME);
 438         ENTRY(VFW_E_DUPLICATE_NAME);
 439         ENTRY(VFW_E_TIMEOUT);
 440         ENTRY(VFW_E_INVALID_FILE_FORMAT);
 441         ENTRY(VFW_E_ENUM_OUT_OF_RANGE);
 442         ENTRY(VFW_E_CIRCULAR_GRAPH);
 443         ENTRY(VFW_E_NOT_ALLOWED_TO_SAVE);
 444         ENTRY(VFW_E_TIME_ALREADY_PASSED);
 445         ENTRY(VFW_E_ALREADY_CANCELLED);
 446         ENTRY(VFW_E_CORRUPT_GRAPH_FILE);
 447         ENTRY(VFW_E_ADVISE_ALREADY_SET);
 448         ENTRY(VFW_S_STATE_INTERMEDIATE);
 449         ENTRY(VFW_E_NO_MODEX_AVAILABLE);
 450         ENTRY(VFW_E_NO_ADVISE_SET);
 451         ENTRY(VFW_E_NO_FULLSCREEN);
 452         ENTRY(VFW_E_IN_FULLSCREEN_MODE);
 453         ENTRY(VFW_E_UNKNOWN_FILE_TYPE);
 454         ENTRY(VFW_E_CANNOT_LOAD_SOURCE_FILTER);
 455         ENTRY(VFW_S_PARTIAL_RENDER);
 456         ENTRY(VFW_E_FILE_TOO_SHORT);
 457         ENTRY(VFW_E_INVALID_FILE_VERSION);
 458         ENTRY(VFW_S_SOME_DATA_IGNORED);
 459         ENTRY(VFW_S_CONNECTIONS_DEFERRED);
 460         ENTRY(VFW_E_INVALID_CLSID);
 461         ENTRY(VFW_E_INVALID_MEDIA_TYPE);
 462         ENTRY(VFW_E_SAMPLE_TIME_NOT_SET);
 463         ENTRY(VFW_S_RESOURCE_NOT_NEEDED);
 464         ENTRY(VFW_E_MEDIA_TIME_NOT_SET);
 465         ENTRY(VFW_E_NO_TIME_FORMAT_SET);
 466         ENTRY(VFW_E_MONO_AUDIO_HW);
 467         ENTRY(VFW_S_MEDIA_TYPE_IGNORED);
 468         ENTRY(VFW_E_NO_DECOMPRESSOR);
 469         ENTRY(VFW_E_NO_AUDIO_HARDWARE);
 470         ENTRY(VFW_S_VIDEO_NOT_RENDERED);
 471         ENTRY(VFW_S_AUDIO_NOT_RENDERED);
 472         ENTRY(VFW_E_RPZA);
 473         ENTRY(VFW_S_RPZA);
 474         ENTRY(VFW_E_PROCESSOR_NOT_SUITABLE);
 475         ENTRY(VFW_E_UNSUPPORTED_AUDIO);
 476         ENTRY(VFW_E_UNSUPPORTED_VIDEO);
 477         ENTRY(VFW_E_MPEG_NOT_CONSTRAINED);
 478         ENTRY(VFW_E_NOT_IN_GRAPH);
 479         ENTRY(VFW_S_ESTIMATED);
 480         ENTRY(VFW_E_NO_TIME_FORMAT);
 481         ENTRY(VFW_E_READ_ONLY);
 482         ENTRY(VFW_S_RESERVED);
 483         ENTRY(VFW_E_BUFFER_UNDERFLOW);
 484         ENTRY(VFW_E_UNSUPPORTED_STREAM);
 485         ENTRY(VFW_E_NO_TRANSPORT);
 486         ENTRY(VFW_S_STREAM_OFF);
 487         ENTRY(VFW_S_CANT_CUE);
 488         ENTRY(VFW_E_BAD_VIDEOCD);
 489         ENTRY(VFW_S_NO_STOP_TIME);
 490         ENTRY(VFW_E_OUT_OF_VIDEO_MEMORY);
 491         ENTRY(VFW_E_VP_NEGOTIATION_FAILED);
 492         ENTRY(VFW_E_DDRAW_CAPS_NOT_SUITABLE);
 493         ENTRY(VFW_E_NO_VP_HARDWARE);
 494         ENTRY(VFW_E_NO_CAPTURE_HARDWARE);
 495         ENTRY(VFW_E_DVD_OPERATION_INHIBITED);
 496         ENTRY(VFW_E_DVD_INVALIDDOMAIN);
 497         ENTRY(VFW_E_DVD_NO_BUTTON);
 498         ENTRY(VFW_E_DVD_GRAPHNOTREADY);
 499         ENTRY(VFW_E_DVD_RENDERFAIL);
 500         ENTRY(VFW_E_DVD_DECNOTENOUGH);
 501         ENTRY(VFW_E_DDRAW_VERSION_NOT_SUITABLE);
 502         ENTRY(VFW_E_COPYPROT_FAILED);
 503         ENTRY(VFW_S_NOPREVIEWPIN);
 504         ENTRY(VFW_E_TIME_EXPIRED);
 505         ENTRY(VFW_S_DVD_NON_ONE_SEQUENTIAL);
 506         ENTRY(VFW_E_DVD_WRONG_SPEED);
 507         ENTRY(VFW_E_DVD_MENU_DOES_NOT_EXIST);
 508         ENTRY(VFW_E_DVD_CMD_CANCELLED);
 509         ENTRY(VFW_E_DVD_STATE_WRONG_VERSION);
 510         ENTRY(VFW_E_DVD_STATE_CORRUPT);
 511         ENTRY(VFW_E_DVD_STATE_WRONG_DISC);
 512         ENTRY(VFW_E_DVD_INCOMPATIBLE_REGION);
 513         ENTRY(VFW_E_DVD_NO_ATTRIBUTES);
 514         ENTRY(VFW_E_DVD_NO_GOUP_PGC);
 515         ENTRY(VFW_E_DVD_LOW_PARENTAL_LEVEL);
 516         ENTRY(VFW_E_DVD_NOT_IN_KARAOKE_MODE);
 517         ENTRY(VFW_S_DVD_CHANNEL_CONTENTS_NOT_AVAILABLE);
 518         ENTRY(VFW_S_DVD_NOT_ACCURATE);
 519         ENTRY(VFW_E_FRAME_STEP_UNSUPPORTED);
 520         ENTRY(VFW_E_DVD_STREAM_DISABLED);
 521         ENTRY(VFW_E_DVD_TITLE_UNKNOWN);
 522         ENTRY(VFW_E_DVD_INVALID_DISC);
 523         ENTRY(VFW_E_DVD_NO_RESUME_INFORMATION);
 524         ENTRY(VFW_E_PIN_ALREADY_BLOCKED_ON_THIS_THREAD);
 525         ENTRY(VFW_E_PIN_ALREADY_BLOCKED);
 526         ENTRY(VFW_E_CERTIFICATION_FAILURE);
 527         #undef  ENTRY
 528         }
 529
 530         return NULL;
 531 }
 532
 533 /***********************************************************************
 534  *      AMGetErrorTextA (quartz.@)
 535  */
 536 DWORD WINAPI AMGetErrorTextA(HRESULT hr, LPSTR pszbuf, DWORD dwBufLen)
 537 {
 538         LPCSTR  lpszRes;
 539         DWORD len;
 540
 541         lpszRes = hresult_to_string( hr );
 542         if ( lpszRes == NULL )
 543                 return 0;
 544         len = (DWORD)(strlen(lpszRes)+1);
 545         if ( len > dwBufLen )
 546                 return 0;
 547
 548         memcpy( pszbuf, lpszRes, len );
 549         return len;
 550 }
 551
 552 /***********************************************************************
 553  *      AMGetErrorTextW (quartz.@)
 554  */
 555 DWORD WINAPI AMGetErrorTextW(HRESULT hr, LPWSTR pwszbuf, DWORD dwBufLen)
 556 {
 557         CHAR    szBuf[MAX_ERROR_TEXT_LEN+1];
 558         DWORD   dwLen;
 559
 560         dwLen = AMGetErrorTextA(hr,szBuf,MAX_ERROR_TEXT_LEN);
 561         if ( dwLen == 0 )
 562                 return 0;
 563         szBuf[dwLen] = 0;
 564
 565         QUARTZ_strncpyAtoW( pwszbuf, szBuf, dwBufLen );
 566
 567         return lstrlenW( pwszbuf );
 568 }