dlls/ole32/classmoniker.c

   1 /*
   2  *                            Class Monikers
   3  *
   4  *           Copyright 1999  Noomen Hamza
   5  *           Copyright 2005-2007  Robert Shearman
   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 <assert.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25
  26 #define COBJMACROS
  27
  28 #include "winerror.h"
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winuser.h"
  32 #include "wine/debug.h"
  33 #include "ole2.h"
  34 #include "moniker.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  37
  38 #define CHARS_IN_GUID 39
  39
  40 /* ClassMoniker data structure */
  41 typedef struct ClassMoniker
  42 {
  43     IMoniker IMoniker_iface;
  44     IROTData IROTData_iface;
  45     LONG ref;
  46
  47     struct
  48     {
  49         CLSID clsid;
  50         DWORD data_len;
  51     } header;
  52     WCHAR *data;
  53
  54     IUnknown *pMarshal; /* custom marshaler */
  55 } ClassMoniker;
  56
  57 static inline ClassMoniker *impl_from_IMoniker(IMoniker *iface)
  58 {
  59     return CONTAINING_RECORD(iface, ClassMoniker, IMoniker_iface);
  60 }
  61
  62 static inline ClassMoniker *impl_from_IROTData(IROTData *iface)
  63 {
  64     return CONTAINING_RECORD(iface, ClassMoniker, IROTData_iface);
  65 }
  66
  67 static const IMonikerVtbl ClassMonikerVtbl;
  68
  69 static ClassMoniker *unsafe_impl_from_IMoniker(IMoniker *iface)
  70 {
  71     if (iface->lpVtbl != &ClassMonikerVtbl)
  72         return NULL;
  73     return CONTAINING_RECORD(iface, ClassMoniker, IMoniker_iface);
  74 }
  75
  76 /*******************************************************************************
  77  *        ClassMoniker_QueryInterface
  78  *******************************************************************************/
  79 static HRESULT WINAPI ClassMoniker_QueryInterface(IMoniker *iface, REFIID riid, void **ppvObject)
  80 {
  81     ClassMoniker *This = impl_from_IMoniker(iface);
  82
  83     TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), ppvObject);
  84
  85     if (!ppvObject)
  86         return E_POINTER;
  87
  88     *ppvObject = 0;
  89
  90     if (IsEqualIID(&IID_IUnknown, riid) ||
  91         IsEqualIID(&IID_IPersist, riid) ||
  92         IsEqualIID(&IID_IPersistStream, riid) ||
  93         IsEqualIID(&IID_IMoniker, riid) ||
  94         IsEqualGUID(&CLSID_ClassMoniker, riid))
  95     {
  96         *ppvObject = iface;
  97     }
  98     else if (IsEqualIID(&IID_IROTData, riid))
  99         *ppvObject = &This->IROTData_iface;
 100     else if (IsEqualIID(&IID_IMarshal, riid))
 101     {
 102         HRESULT hr = S_OK;
 103         if (!This->pMarshal)
 104             hr = MonikerMarshal_Create(iface, &This->pMarshal);
 105         if (hr != S_OK)
 106             return hr;
 107         return IUnknown_QueryInterface(This->pMarshal, riid, ppvObject);
 108     }
 109
 110     if (!*ppvObject)
 111         return E_NOINTERFACE;
 112
 113     IMoniker_AddRef(iface);
 114
 115     return S_OK;
 116 }
 117
 118 /******************************************************************************
 119  *        ClassMoniker_AddRef
 120  ******************************************************************************/
 121 static ULONG WINAPI ClassMoniker_AddRef(IMoniker* iface)
 122 {
 123     ClassMoniker *This = impl_from_IMoniker(iface);
 124
 125     TRACE("(%p)\n",This);
 126
 127     return InterlockedIncrement(&This->ref);
 128 }
 129
 130 static ULONG WINAPI ClassMoniker_Release(IMoniker* iface)
 131 {
 132     ClassMoniker *moniker = impl_from_IMoniker(iface);
 133     ULONG ref = InterlockedDecrement(&moniker->ref);
 134
 135     TRACE("%p, refcount %lu.\n", iface, ref);
 136
 137     if (!ref)
 138     {
 139         if (moniker->pMarshal) IUnknown_Release(moniker->pMarshal);
 140         free(moniker->data);
 141         free(moniker);
 142     }
 143
 144     return ref;
 145 }
 146
 147 /******************************************************************************
 148  *        ClassMoniker_GetClassID
 149  ******************************************************************************/
 150 static HRESULT WINAPI ClassMoniker_GetClassID(IMoniker* iface,CLSID *pClassID)
 151 {
 152     TRACE("(%p, %p)\n", iface, pClassID);
 153
 154     if (pClassID==NULL)
 155         return E_POINTER;
 156
 157     *pClassID = CLSID_ClassMoniker;
 158
 159     return S_OK;
 160 }
 161
 162 /******************************************************************************
 163  *        ClassMoniker_IsDirty
 164  ******************************************************************************/
 165 static HRESULT WINAPI ClassMoniker_IsDirty(IMoniker* iface)
 166 {
 167     /* Note that the OLE-provided implementations of the IPersistStream::IsDirty
 168        method in the OLE-provided moniker interfaces always return S_FALSE because
 169        their internal state never changes. */
 170
 171     TRACE("(%p)\n",iface);
 172
 173     return S_FALSE;
 174 }
 175
 176 static HRESULT WINAPI ClassMoniker_Load(IMoniker *iface, IStream *stream)
 177 {
 178     ClassMoniker *moniker = impl_from_IMoniker(iface);
 179     ULONG length;
 180     HRESULT hr;
 181
 182     TRACE("%p, %p\n", iface, stream);
 183
 184     hr = IStream_Read(stream, &moniker->header, sizeof(moniker->header), &length);
 185     if (hr != S_OK || length != sizeof(moniker->header)) return STG_E_READFAULT;
 186
 187     if (moniker->header.data_len)
 188     {
 189         free(moniker->data);
 190         if (!(moniker->data = malloc(moniker->header.data_len)))
 191         {
 192             WARN("Failed to allocate moniker data of size %lu.\n", moniker->header.data_len);
 193             moniker->header.data_len = 0;
 194             return E_OUTOFMEMORY;
 195         }
 196         hr = IStream_Read(stream, moniker->data, moniker->header.data_len, &length);
 197         if (hr != S_OK || length != moniker->header.data_len) return STG_E_READFAULT;
 198     }
 199
 200     return S_OK;
 201 }
 202
 203 static HRESULT WINAPI ClassMoniker_Save(IMoniker *iface, IStream *stream, BOOL clear_dirty)
 204 {
 205     ClassMoniker *moniker = impl_from_IMoniker(iface);
 206     HRESULT hr;
 207
 208     TRACE("%p, %p, %d\n", iface, stream, clear_dirty);
 209
 210     hr = IStream_Write(stream, &moniker->header, sizeof(moniker->header), NULL);
 211
 212     if (SUCCEEDED(hr) && moniker->header.data_len)
 213         hr = IStream_Write(stream, moniker->data, moniker->header.data_len, NULL);
 214
 215     return hr;
 216 }
 217
 218 static HRESULT WINAPI ClassMoniker_GetSizeMax(IMoniker *iface, ULARGE_INTEGER *size)
 219 {
 220     ClassMoniker *moniker = impl_from_IMoniker(iface);
 221
 222     TRACE("%p, %p\n", iface, size);
 223
 224     size->QuadPart = sizeof(moniker->header) + moniker->header.data_len;
 225
 226     return S_OK;
 227 }
 228
 229 /******************************************************************************
 230  *                  ClassMoniker_BindToObject
 231  ******************************************************************************/
 232 static HRESULT WINAPI ClassMoniker_BindToObject(IMoniker* iface,
 233                                             IBindCtx* pbc,
 234                                             IMoniker* pmkToLeft,
 235                                             REFIID riid,
 236                                             VOID** ppvResult)
 237 {
 238     ClassMoniker *moniker = impl_from_IMoniker(iface);
 239     BIND_OPTS2 bindopts;
 240     IClassActivator *pActivator;
 241     HRESULT hr;
 242
 243     TRACE("(%p, %p, %s, %p)\n", pbc, pmkToLeft, debugstr_guid(riid), ppvResult);
 244
 245     bindopts.cbStruct = sizeof(bindopts);
 246     IBindCtx_GetBindOptions(pbc, (BIND_OPTS *)&bindopts);
 247
 248     if (!pmkToLeft)
 249         return CoGetClassObject(&moniker->header.clsid, bindopts.dwClassContext, NULL,
 250                                 riid, ppvResult);
 251     else
 252     {
 253         hr = IMoniker_BindToObject(pmkToLeft, pbc, NULL, &IID_IClassActivator,
 254                                    (void **)&pActivator);
 255         if (FAILED(hr)) return hr;
 256
 257         hr = IClassActivator_GetClassObject(pActivator, &moniker->header.clsid,
 258                                             bindopts.dwClassContext,
 259                                             bindopts.locale, riid, ppvResult);
 260
 261         IClassActivator_Release(pActivator);
 262
 263         return hr;
 264     }
 265 }
 266
 267 /******************************************************************************
 268  *        ClassMoniker_BindToStorage
 269  ******************************************************************************/
 270 static HRESULT WINAPI ClassMoniker_BindToStorage(IMoniker* iface,
 271                                              IBindCtx* pbc,
 272                                              IMoniker* pmkToLeft,
 273                                              REFIID riid,
 274                                              VOID** ppvResult)
 275 {
 276     TRACE("(%p, %p, %s, %p)\n", pbc, pmkToLeft, debugstr_guid(riid), ppvResult);
 277     return IMoniker_BindToObject(iface, pbc, pmkToLeft, riid, ppvResult);
 278 }
 279
 280 static HRESULT WINAPI ClassMoniker_Reduce(IMoniker* iface, IBindCtx *pbc,
 281         DWORD dwReduceHowFar, IMoniker **ppmkToLeft, IMoniker **ppmkReduced)
 282 {
 283     TRACE("%p, %p, %ld, %p, %p.\n", iface, pbc, dwReduceHowFar, ppmkToLeft, ppmkReduced);
 284
 285     if (!ppmkReduced)
 286         return E_POINTER;
 287
 288     IMoniker_AddRef(iface);
 289
 290     *ppmkReduced = iface;
 291
 292     return MK_S_REDUCED_TO_SELF;
 293 }
 294
 295 static HRESULT WINAPI ClassMoniker_ComposeWith(IMoniker *iface, IMoniker *right,
 296         BOOL only_if_not_generic, IMoniker **result)
 297 {
 298     DWORD order;
 299
 300     TRACE("%p, %p, %d, %p.\n", iface, right, only_if_not_generic, result);
 301
 302     if (!result || !right)
 303         return E_POINTER;
 304
 305     *result = NULL;
 306
 307     if (is_anti_moniker(right, &order))
 308         return S_OK;
 309
 310     return only_if_not_generic ? MK_E_NEEDGENERIC : CreateGenericComposite(iface, right, result);
 311 }
 312
 313 /******************************************************************************
 314  *        ClassMoniker_Enum
 315  ******************************************************************************/
 316 static HRESULT WINAPI ClassMoniker_Enum(IMoniker* iface,BOOL fForward, IEnumMoniker** ppenumMoniker)
 317 {
 318     TRACE("(%p,%d,%p)\n",iface,fForward,ppenumMoniker);
 319
 320     if (ppenumMoniker == NULL)
 321         return E_POINTER;
 322
 323     *ppenumMoniker = NULL;
 324
 325     return S_OK;
 326 }
 327
 328 static HRESULT WINAPI ClassMoniker_IsEqual(IMoniker *iface, IMoniker *other)
 329 {
 330     ClassMoniker *moniker = impl_from_IMoniker(iface), *other_moniker;
 331
 332     TRACE("%p, %p.\n", iface, other);
 333
 334     if (!other)
 335         return E_INVALIDARG;
 336
 337     other_moniker = unsafe_impl_from_IMoniker(other);
 338     if (!other_moniker)
 339         return S_FALSE;
 340
 341     return IsEqualGUID(&moniker->header.clsid, &other_moniker->header.clsid) ? S_OK : S_FALSE;
 342 }
 343
 344 static HRESULT WINAPI ClassMoniker_Hash(IMoniker *iface, DWORD *hash)
 345 {
 346     ClassMoniker *moniker = impl_from_IMoniker(iface);
 347
 348     TRACE("%p, %p\n", iface, hash);
 349
 350     *hash = moniker->header.clsid.Data1;
 351
 352     return S_OK;
 353 }
 354
 355 /******************************************************************************
 356  *        ClassMoniker_IsRunning
 357  ******************************************************************************/
 358 static HRESULT WINAPI ClassMoniker_IsRunning(IMoniker* iface,
 359                                          IBindCtx* pbc,
 360                                          IMoniker* pmkToLeft,
 361                                          IMoniker* pmkNewlyRunning)
 362 {
 363     TRACE("(%p, %p, %p)\n", pbc, pmkToLeft, pmkNewlyRunning);
 364
 365     /* as in native */
 366     return E_NOTIMPL;
 367 }
 368
 369 /******************************************************************************
 370  *        ClassMoniker_GetTimeOfLastChange
 371  ******************************************************************************/
 372 static HRESULT WINAPI ClassMoniker_GetTimeOfLastChange(IMoniker* iface,
 373                                                    IBindCtx* pbc,
 374                                                    IMoniker* pmkToLeft,
 375                                                    FILETIME* pItemTime)
 376 {
 377     TRACE("(%p, %p, %p)\n", pbc, pmkToLeft, pItemTime);
 378
 379     return MK_E_UNAVAILABLE;
 380 }
 381
 382 /******************************************************************************
 383  *        ClassMoniker_Inverse
 384  ******************************************************************************/
 385 static HRESULT WINAPI ClassMoniker_Inverse(IMoniker* iface,IMoniker** ppmk)
 386 {
 387     TRACE("(%p)\n",ppmk);
 388
 389     if (!ppmk)
 390         return E_POINTER;
 391
 392     return CreateAntiMoniker(ppmk);
 393 }
 394
 395 static HRESULT WINAPI ClassMoniker_CommonPrefixWith(IMoniker *iface, IMoniker *other, IMoniker **prefix)
 396 {
 397     ClassMoniker *moniker = impl_from_IMoniker(iface), *other_moniker;
 398
 399     TRACE("%p, %p, %p\n", iface, other, prefix);
 400
 401     *prefix = NULL;
 402
 403     other_moniker = unsafe_impl_from_IMoniker(other);
 404
 405     if (other_moniker)
 406     {
 407         if (!IsEqualGUID(&moniker->header.clsid, &other_moniker->header.clsid)) return MK_E_NOPREFIX;
 408
 409         *prefix = iface;
 410         IMoniker_AddRef(iface);
 411
 412         return MK_S_US;
 413     }
 414
 415     return MonikerCommonPrefixWith(iface, other, prefix);
 416 }
 417
 418 /******************************************************************************
 419  *        ClassMoniker_RelativePathTo
 420  ******************************************************************************/
 421 static HRESULT WINAPI ClassMoniker_RelativePathTo(IMoniker* iface,IMoniker* pmOther, IMoniker** ppmkRelPath)
 422 {
 423     TRACE("(%p, %p)\n",pmOther,ppmkRelPath);
 424
 425     if (!ppmkRelPath)
 426         return E_POINTER;
 427
 428     *ppmkRelPath = NULL;
 429
 430     return MK_E_NOTBINDABLE;
 431 }
 432
 433 static HRESULT WINAPI ClassMoniker_GetDisplayName(IMoniker *iface,
 434         IBindCtx *pbc, IMoniker *pmkToLeft, LPOLESTR *name)
 435 {
 436     ClassMoniker *moniker = impl_from_IMoniker(iface);
 437     static const int name_len = CHARS_IN_GUID + 5 /* prefix */;
 438     const GUID *guid = &moniker->header.clsid;
 439
 440     TRACE("%p, %p, %p, %p.\n", iface, pbc, pmkToLeft, name);
 441
 442     if (!name)
 443         return E_POINTER;
 444
 445     if (pmkToLeft)
 446         return E_INVALIDARG;
 447
 448     if (!(*name = CoTaskMemAlloc(name_len * sizeof(WCHAR) + moniker->header.data_len)))
 449         return E_OUTOFMEMORY;
 450
 451     swprintf(*name, name_len, L"clsid:%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X",
 452             guid->Data1, guid->Data2, guid->Data3, guid->Data4[0], guid->Data4[1], guid->Data4[2],
 453             guid->Data4[3], guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
 454
 455     if (moniker->header.data_len)
 456         lstrcatW(*name, moniker->data);
 457     lstrcatW(*name, L":");
 458
 459     TRACE("Returning %s\n", debugstr_w(*name));
 460
 461     return S_OK;
 462 }
 463
 464 static HRESULT WINAPI ClassMoniker_ParseDisplayName(IMoniker *iface, IBindCtx *pbc,
 465         IMoniker *pmkToLeft, LPOLESTR display_name, ULONG *eaten, IMoniker **result)
 466 {
 467     IParseDisplayName *parser;
 468     HRESULT hr;
 469
 470     TRACE("%p, %p, %p, %s, %p, %p\n", iface, pbc, pmkToLeft, debugstr_w(display_name), eaten, result);
 471
 472     if (SUCCEEDED(hr = IMoniker_BindToObject(iface, pbc, pmkToLeft, &IID_IParseDisplayName, (void **)&parser)))
 473     {
 474         hr = IParseDisplayName_ParseDisplayName(parser, pbc, display_name, eaten, result);
 475         IParseDisplayName_Release(parser);
 476     }
 477
 478     return hr;
 479 }
 480
 481 /******************************************************************************
 482  *        ClassMoniker_IsSystemMoniker
 483  ******************************************************************************/
 484 static HRESULT WINAPI ClassMoniker_IsSystemMoniker(IMoniker* iface,DWORD* pwdMksys)
 485 {
 486     TRACE("(%p,%p)\n",iface,pwdMksys);
 487
 488     if (!pwdMksys)
 489         return E_POINTER;
 490
 491     *pwdMksys = MKSYS_CLASSMONIKER;
 492
 493     return S_OK;
 494 }
 495
 496 /*******************************************************************************
 497  *        ClassMonikerIROTData_QueryInterface
 498  *******************************************************************************/
 499 static HRESULT WINAPI ClassMonikerROTData_QueryInterface(IROTData *iface,REFIID riid,VOID** ppvObject)
 500 {
 501
 502     ClassMoniker *This = impl_from_IROTData(iface);
 503
 504     TRACE("(%p, %s, %p)\n", iface, debugstr_guid(riid), ppvObject);
 505
 506     return IMoniker_QueryInterface(&This->IMoniker_iface, riid, ppvObject);
 507 }
 508
 509 /***********************************************************************
 510  *        ClassMonikerIROTData_AddRef
 511  */
 512 static ULONG WINAPI ClassMonikerROTData_AddRef(IROTData *iface)
 513 {
 514     ClassMoniker *This = impl_from_IROTData(iface);
 515
 516     TRACE("(%p)\n",iface);
 517
 518     return IMoniker_AddRef(&This->IMoniker_iface);
 519 }
 520
 521 /***********************************************************************
 522  *        ClassMonikerIROTData_Release
 523  */
 524 static ULONG WINAPI ClassMonikerROTData_Release(IROTData* iface)
 525 {
 526     ClassMoniker *This = impl_from_IROTData(iface);
 527
 528     TRACE("(%p)\n",iface);
 529
 530     return IMoniker_Release(&This->IMoniker_iface);
 531 }
 532
 533 /******************************************************************************
 534  *        ClassMonikerIROTData_GetComparisonData
 535  ******************************************************************************/
 536 static HRESULT WINAPI ClassMonikerROTData_GetComparisonData(IROTData* iface,
 537                                                          BYTE* pbData,
 538                                                          ULONG cbMax,
 539                                                          ULONG* pcbData)
 540 {
 541     ClassMoniker *This = impl_from_IROTData(iface);
 542
 543     TRACE("%p, %p, %lu, %p.\n", iface, pbData, cbMax, pcbData);
 544
 545     *pcbData = 2*sizeof(CLSID);
 546     if (cbMax < *pcbData)
 547         return E_OUTOFMEMORY;
 548
 549     /* write CLSID of the moniker */
 550     memcpy(pbData, &CLSID_ClassMoniker, sizeof(CLSID));
 551     /* write CLSID the moniker represents */
 552     memcpy(pbData+sizeof(CLSID), &This->header.clsid, sizeof(CLSID));
 553
 554     return S_OK;
 555 }
 556
 557 static const IMonikerVtbl ClassMonikerVtbl =
 558 {
 559     ClassMoniker_QueryInterface,
 560     ClassMoniker_AddRef,
 561     ClassMoniker_Release,
 562     ClassMoniker_GetClassID,
 563     ClassMoniker_IsDirty,
 564     ClassMoniker_Load,
 565     ClassMoniker_Save,
 566     ClassMoniker_GetSizeMax,
 567     ClassMoniker_BindToObject,
 568     ClassMoniker_BindToStorage,
 569     ClassMoniker_Reduce,
 570     ClassMoniker_ComposeWith,
 571     ClassMoniker_Enum,
 572     ClassMoniker_IsEqual,
 573     ClassMoniker_Hash,
 574     ClassMoniker_IsRunning,
 575     ClassMoniker_GetTimeOfLastChange,
 576     ClassMoniker_Inverse,
 577     ClassMoniker_CommonPrefixWith,
 578     ClassMoniker_RelativePathTo,
 579     ClassMoniker_GetDisplayName,
 580     ClassMoniker_ParseDisplayName,
 581     ClassMoniker_IsSystemMoniker
 582 };
 583
 584 /********************************************************************************/
 585 /* Virtual function table for the IROTData class.                               */
 586 static const IROTDataVtbl ROTDataVtbl =
 587 {
 588     ClassMonikerROTData_QueryInterface,
 589     ClassMonikerROTData_AddRef,
 590     ClassMonikerROTData_Release,
 591     ClassMonikerROTData_GetComparisonData
 592 };
 593
 594 static HRESULT create_class_moniker(const CLSID *clsid, const WCHAR *data,
 595         unsigned int data_len, IMoniker **moniker)
 596 {
 597     ClassMoniker *object;
 598
 599     if (!(object = calloc(1, sizeof(*object))))
 600         return E_OUTOFMEMORY;
 601
 602     object->IMoniker_iface.lpVtbl = &ClassMonikerVtbl;
 603     object->IROTData_iface.lpVtbl = &ROTDataVtbl;
 604     object->ref = 1;
 605     object->header.clsid = *clsid;
 606     if (data_len)
 607     {
 608         object->header.data_len = (data_len + 1) * sizeof(WCHAR);
 609
 610         if (!(object->data = malloc(object->header.data_len)))
 611         {
 612             IMoniker_Release(&object->IMoniker_iface);
 613             return E_OUTOFMEMORY;
 614         }
 615         memcpy(object->data, data, data_len * sizeof(WCHAR));
 616         object->data[data_len] = 0;
 617     }
 618
 619     *moniker = &object->IMoniker_iface;
 620
 621     return S_OK;
 622 }
 623
 624 /******************************************************************************
 625  *        CreateClassMoniker    [OLE32.@]
 626  ******************************************************************************/
 627 HRESULT WINAPI CreateClassMoniker(REFCLSID rclsid, IMoniker **moniker)
 628 {
 629     TRACE("%s, %p\n", debugstr_guid(rclsid), moniker);
 630
 631     return create_class_moniker(rclsid, NULL, 0, moniker);
 632 }
 633
 634 HRESULT ClassMoniker_CreateFromDisplayName(LPBC pbc, const WCHAR *display_name,
 635         DWORD *eaten, IMoniker **moniker)
 636 {
 637     const WCHAR *end, *s;
 638     BOOL has_braces;
 639     WCHAR uuid[37];
 640     CLSID clsid;
 641     HRESULT hr;
 642     int len;
 643
 644     s = display_name;
 645
 646     /* Skip prefix */
 647     if (wcsnicmp(s, L"clsid:", 6)) return MK_E_SYNTAX;
 648     s += 6;
 649
 650     /* Terminating marker is optional */
 651     if (!(end = wcschr(s, ':')))
 652         end = s + lstrlenW(s);
 653
 654     len = end - s;
 655     if (len < 36)
 656         return MK_E_SYNTAX;
 657
 658     if ((has_braces = *s == '{')) s++;
 659
 660     memcpy(uuid, s, 36 * sizeof(WCHAR));
 661     uuid[36] = 0;
 662
 663     if (UuidFromStringW(uuid, &clsid))
 664     {
 665         WARN("Failed to parse clsid string.\n");
 666         return MK_E_SYNTAX;
 667     }
 668
 669     s += 36;
 670     if (has_braces)
 671     {
 672         if (*s != '}') return MK_E_SYNTAX;
 673         s++;
 674     }
 675
 676     /* Consume terminal marker */
 677     len = end - s;
 678     if (*end == ':') end++;
 679
 680     hr = create_class_moniker(&clsid, len ? s : NULL, len, moniker);
 681     if (SUCCEEDED(hr))
 682         *eaten = end - display_name;
 683     return hr;
 684 }
 685
 686 HRESULT WINAPI ClassMoniker_CreateInstance(IClassFactory *iface,
 687     IUnknown *pUnk, REFIID riid, void **ppv)
 688 {
 689     HRESULT hr;
 690     IMoniker *pmk;
 691
 692     TRACE("(%p, %s, %p)\n", pUnk, debugstr_guid(riid), ppv);
 693
 694     *ppv = NULL;
 695
 696     if (pUnk)
 697         return CLASS_E_NOAGGREGATION;
 698
 699     hr = CreateClassMoniker(&CLSID_NULL, &pmk);
 700     if (FAILED(hr)) return hr;
 701
 702     hr = IMoniker_QueryInterface(pmk, riid, ppv);
 703     IMoniker_Release(pmk);
 704
 705     return hr;
 706 }