dlls/ole32/comcat.c

   1 /*
   2  * Comcat implementation
   3  *
   4  * Copyright (C) 2002 John K. Hohm
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <string.h>
  22 #include <stdarg.h>
  23
  24 #define COBJMACROS
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winuser.h"
  29 #include "winreg.h"
  30 #include "winerror.h"
  31
  32 #include "ole2.h"
  33 #include "comcat.h"
  34 #include "wine/unicode.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  38
  39 typedef struct
  40 {
  41     const ICatRegisterVtbl *lpVtbl;
  42     const ICatInformationVtbl *infVtbl;
  43 } ComCatMgrImpl;
  44
  45 struct class_categories {
  46     LPCWSTR impl_strings;
  47     LPCWSTR req_strings;
  48 };
  49
  50 static LPENUMCATEGORYINFO COMCAT_IEnumCATEGORYINFO_Construct(LCID lcid);
  51 static LPENUMGUID COMCAT_CLSID_IEnumGUID_Construct(struct class_categories *class_categories);
  52 static LPENUMGUID COMCAT_CATID_IEnumGUID_Construct(REFCLSID rclsid, LPCWSTR impl_req);
  53
  54 /**********************************************************************
  55  * File-scope string constants
  56  */
  57 static const WCHAR comcat_keyname[] = {
  58     'C','o','m','p','o','n','e','n','t',' ','C','a','t','e','g','o','r','i','e','s',0 };
  59 static const WCHAR impl_keyname[] = {
  60     'I','m','p','l','e','m','e','n','t','e','d',' ','C','a','t','e','g','o','r','i','e','s',0 };
  61 static const WCHAR req_keyname[] = {
  62     'R','e','q','u','i','r','e','d',' ','C','a','t','e','g','o','r','i','e','s',0 };
  63 static const WCHAR clsid_keyname[] = { 'C','L','S','I','D',0 };
  64
  65
  66 static inline ComCatMgrImpl *impl_from_ICatInformation( ICatInformation *iface )
  67 {
  68     return (ComCatMgrImpl *)((char*)iface - FIELD_OFFSET(ComCatMgrImpl, infVtbl));
  69 }
  70
  71
  72 /**********************************************************************
  73  * COMCAT_RegisterClassCategories
  74  */
  75 static HRESULT COMCAT_RegisterClassCategories(
  76     REFCLSID rclsid,
  77     LPCWSTR type,
  78     ULONG cCategories,
  79     const CATID *rgcatid)
  80 {
  81     WCHAR keyname[39];
  82     HRESULT res;
  83     HKEY clsid_key, class_key, type_key;
  84
  85     if (cCategories && rgcatid == NULL) return E_POINTER;
  86
  87     /* Format the class key name. */
  88     res = StringFromGUID2(rclsid, keyname, 39);
  89     if (FAILED(res)) return res;
  90
  91     /* Create (or open) the CLSID key. */
  92     res = RegCreateKeyExW(HKEY_CLASSES_ROOT, clsid_keyname, 0, NULL, 0,
  93                           KEY_READ | KEY_WRITE, NULL, &clsid_key, NULL);
  94     if (res != ERROR_SUCCESS) return E_FAIL;
  95
  96     /* Create (or open) the class key. */
  97     res = RegCreateKeyExW(clsid_key, keyname, 0, NULL, 0,
  98                           KEY_READ | KEY_WRITE, NULL, &class_key, NULL);
  99     if (res == ERROR_SUCCESS) {
 100         /* Create (or open) the category type key. */
 101         res = RegCreateKeyExW(class_key, type, 0, NULL, 0,
 102                               KEY_READ | KEY_WRITE, NULL, &type_key, NULL);
 103         if (res == ERROR_SUCCESS) {
 104             for (; cCategories; --cCategories, ++rgcatid) {
 105                 HKEY key;
 106
 107                 /* Format the category key name. */
 108                 res = StringFromGUID2(rgcatid, keyname, 39);
 109                 if (FAILED(res)) continue;
 110
 111                 /* Do the register. */
 112                 res = RegCreateKeyExW(type_key, keyname, 0, NULL, 0,
 113                                       KEY_READ | KEY_WRITE, NULL, &key, NULL);
 114                 if (res == ERROR_SUCCESS) RegCloseKey(key);
 115             }
 116             res = S_OK;
 117         } else res = E_FAIL;
 118         RegCloseKey(class_key);
 119     } else res = E_FAIL;
 120     RegCloseKey(clsid_key);
 121
 122     return res;
 123 }
 124
 125 /**********************************************************************
 126  * COMCAT_UnRegisterClassCategories
 127  */
 128 static HRESULT COMCAT_UnRegisterClassCategories(
 129     REFCLSID rclsid,
 130     LPCWSTR type,
 131     ULONG cCategories,
 132     const CATID *rgcatid)
 133 {
 134     WCHAR keyname[68] = { 'C', 'L', 'S', 'I', 'D', '\\' };
 135     HRESULT res;
 136     HKEY type_key;
 137
 138     if (cCategories && rgcatid == NULL) return E_POINTER;
 139
 140     /* Format the class category type key name. */
 141     res = StringFromGUID2(rclsid, keyname + 6, 39);
 142     if (FAILED(res)) return res;
 143     keyname[44] = '\\';
 144     lstrcpyW(keyname + 45, type);
 145
 146     /* Open the class category type key. */
 147     res = RegOpenKeyExW(HKEY_CLASSES_ROOT, keyname, 0,
 148                         KEY_READ | KEY_WRITE, &type_key);
 149     if (res != ERROR_SUCCESS) return E_FAIL;
 150
 151     for (; cCategories; --cCategories, ++rgcatid) {
 152         /* Format the category key name. */
 153         res = StringFromGUID2(rgcatid, keyname, 39);
 154         if (FAILED(res)) continue;
 155
 156         /* Do the unregister. */
 157         RegDeleteKeyW(type_key, keyname);
 158     }
 159     RegCloseKey(type_key);
 160
 161     return S_OK;
 162 }
 163
 164 /**********************************************************************
 165  * COMCAT_GetCategoryDesc
 166  */
 167 static HRESULT COMCAT_GetCategoryDesc(HKEY key, LCID lcid, PWCHAR pszDesc,
 168                                       ULONG buf_wchars)
 169 {
 170     static const WCHAR fmt[] = { '%', 'l', 'X', 0 };
 171     WCHAR valname[5];
 172     HRESULT res;
 173     DWORD type, size = (buf_wchars - 1) * sizeof(WCHAR);
 174
 175     if (pszDesc == NULL) return E_INVALIDARG;
 176
 177     /* FIXME: lcid comparisons are more complex than this! */
 178     wsprintfW(valname, fmt, lcid);
 179     res = RegQueryValueExW(key, valname, 0, &type, (LPBYTE)pszDesc, &size);
 180     if (res != ERROR_SUCCESS || type != REG_SZ) {
 181         FIXME("Simplified lcid comparison\n");
 182         return CAT_E_NODESCRIPTION;
 183     }
 184     pszDesc[size / sizeof(WCHAR)] = 0;
 185
 186     return S_OK;
 187 }
 188
 189 /**********************************************************************
 190  * COMCAT_PrepareClassCategories
 191  */
 192 static struct class_categories *COMCAT_PrepareClassCategories(
 193     ULONG impl_count, const CATID *impl_catids, ULONG req_count, const CATID *req_catids)
 194 {
 195     struct class_categories *categories;
 196     WCHAR *strings;
 197
 198     categories = HeapAlloc(
 199         GetProcessHeap(), HEAP_ZERO_MEMORY,
 200         sizeof(struct class_categories) +
 201         ((impl_count + req_count) * 39 + 2) * sizeof(WCHAR));
 202     if (categories == NULL) return categories;
 203
 204     strings = (WCHAR *)(categories + 1);
 205     categories->impl_strings = strings;
 206     while (impl_count--) {
 207         StringFromGUID2(impl_catids++, strings, 39);
 208         strings += 39;
 209     }
 210     *strings++ = 0;
 211
 212     categories->req_strings = strings;
 213     while (req_count--) {
 214         StringFromGUID2(req_catids++, strings, 39);
 215         strings += 39;
 216     }
 217     *strings++ = 0;
 218
 219     return categories;
 220 }
 221
 222 /**********************************************************************
 223  * COMCAT_IsClassOfCategories
 224  */
 225 static HRESULT COMCAT_IsClassOfCategories(
 226     HKEY key,
 227     struct class_categories const* categories)
 228 {
 229     HKEY subkey;
 230     HRESULT res;
 231     DWORD index;
 232     LPCWSTR string;
 233
 234     /* Check that every given category is implemented by class. */
 235     res = RegOpenKeyExW(key, impl_keyname, 0, KEY_READ, &subkey);
 236     if (res != ERROR_SUCCESS) return S_FALSE;
 237     for (string = categories->impl_strings; *string; string += 39) {
 238         HKEY catkey;
 239         res = RegOpenKeyExW(subkey, string, 0, 0, &catkey);
 240         if (res != ERROR_SUCCESS) {
 241             RegCloseKey(subkey);
 242             return S_FALSE;
 243         }
 244         RegCloseKey(catkey);
 245     }
 246     RegCloseKey(subkey);
 247
 248     /* Check that all categories required by class are given. */
 249     res = RegOpenKeyExW(key, req_keyname, 0, KEY_READ, &subkey);
 250     if (res == ERROR_SUCCESS) {
 251         for (index = 0; ; ++index) {
 252             WCHAR keyname[39];
 253             DWORD size = 39;
 254
 255             res = RegEnumKeyExW(subkey, index, keyname, &size,
 256                                 NULL, NULL, NULL, NULL);
 257             if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
 258             if (size != 38) continue; /* bogus catid in registry */
 259             for (string = categories->req_strings; *string; string += 39)
 260                 if (!strcmpiW(string, keyname)) break;
 261             if (!*string) {
 262                 RegCloseKey(subkey);
 263                 return S_FALSE;
 264             }
 265         }
 266         RegCloseKey(subkey);
 267     }
 268
 269     return S_OK;
 270 }
 271
 272 /**********************************************************************
 273  * COMCAT_ICatRegister_QueryInterface
 274  */
 275 static HRESULT WINAPI COMCAT_ICatRegister_QueryInterface(
 276     LPCATREGISTER iface,
 277     REFIID riid,
 278     LPVOID *ppvObj)
 279 {
 280     ComCatMgrImpl *This = (ComCatMgrImpl *)iface;
 281     TRACE("\n\tIID:\t%s\n",debugstr_guid(riid));
 282
 283     if (ppvObj == NULL) return E_POINTER;
 284
 285     if (IsEqualGUID(riid, &IID_IUnknown) || IsEqualGUID(riid, &IID_ICatRegister)) {
 286         *ppvObj = iface;
 287         IUnknown_AddRef(iface);
 288         return S_OK;
 289     }
 290
 291     if (IsEqualGUID(riid, &IID_ICatInformation)) {
 292         *ppvObj = &This->infVtbl;
 293         IUnknown_AddRef(iface);
 294         return S_OK;
 295     }
 296
 297     return E_NOINTERFACE;
 298 }
 299
 300 /**********************************************************************
 301  * COMCAT_ICatRegister_AddRef
 302  */
 303 static ULONG WINAPI COMCAT_ICatRegister_AddRef(LPCATREGISTER iface)
 304 {
 305     return 2; /* non-heap based object */
 306 }
 307
 308 /**********************************************************************
 309  * COMCAT_ICatRegister_Release
 310  */
 311 static ULONG WINAPI COMCAT_ICatRegister_Release(LPCATREGISTER iface)
 312 {
 313     return 1; /* non-heap based object */
 314 }
 315
 316 /**********************************************************************
 317  * COMCAT_ICatRegister_RegisterCategories
 318  */
 319 static HRESULT WINAPI COMCAT_ICatRegister_RegisterCategories(
 320     LPCATREGISTER iface,
 321     ULONG cCategories,
 322     CATEGORYINFO *rgci)
 323 {
 324     HKEY comcat_key;
 325     HRESULT res;
 326
 327     TRACE("\n");
 328
 329     if (cCategories && rgci == NULL)
 330         return E_POINTER;
 331
 332     /* Create (or open) the component categories key. */
 333     res = RegCreateKeyExW(HKEY_CLASSES_ROOT, comcat_keyname, 0, NULL, 0,
 334                           KEY_READ | KEY_WRITE, NULL, &comcat_key, NULL);
 335     if (res != ERROR_SUCCESS) return E_FAIL;
 336
 337     for (; cCategories; --cCategories, ++rgci) {
 338         static const WCHAR fmt[] = { '%', 'l', 'X', 0 };
 339         WCHAR keyname[39];
 340         WCHAR valname[9];
 341         HKEY cat_key;
 342
 343         /* Create (or open) the key for this category. */
 344         if (!StringFromGUID2(&rgci->catid, keyname, 39)) continue;
 345         res = RegCreateKeyExW(comcat_key, keyname, 0, NULL, 0,
 346                               KEY_READ | KEY_WRITE, NULL, &cat_key, NULL);
 347         if (res != ERROR_SUCCESS) continue;
 348
 349         /* Set the value for this locale's description. */
 350         wsprintfW(valname, fmt, rgci->lcid);
 351         RegSetValueExW(cat_key, valname, 0, REG_SZ,
 352                        (CONST BYTE*)(rgci->szDescription),
 353                        (lstrlenW(rgci->szDescription) + 1) * sizeof(WCHAR));
 354
 355         RegCloseKey(cat_key);
 356     }
 357
 358     RegCloseKey(comcat_key);
 359     return S_OK;
 360 }
 361
 362 /**********************************************************************
 363  * COMCAT_ICatRegister_UnRegisterCategories
 364  */
 365 static HRESULT WINAPI COMCAT_ICatRegister_UnRegisterCategories(
 366     LPCATREGISTER iface,
 367     ULONG cCategories,
 368     CATID *rgcatid)
 369 {
 370     HKEY comcat_key;
 371     HRESULT res;
 372
 373     TRACE("\n");
 374
 375     if (cCategories && rgcatid == NULL)
 376         return E_POINTER;
 377
 378     /* Open the component categories key. */
 379     res = RegOpenKeyExW(HKEY_CLASSES_ROOT, comcat_keyname, 0,
 380                         KEY_READ | KEY_WRITE, &comcat_key);
 381     if (res != ERROR_SUCCESS) return E_FAIL;
 382
 383     for (; cCategories; --cCategories, ++rgcatid) {
 384         WCHAR keyname[39];
 385
 386         /* Delete the key for this category. */
 387         if (!StringFromGUID2(rgcatid, keyname, 39)) continue;
 388         RegDeleteKeyW(comcat_key, keyname);
 389     }
 390
 391     RegCloseKey(comcat_key);
 392     return S_OK;
 393 }
 394
 395 /**********************************************************************
 396  * COMCAT_ICatRegister_RegisterClassImplCategories
 397  */
 398 static HRESULT WINAPI COMCAT_ICatRegister_RegisterClassImplCategories(
 399     LPCATREGISTER iface,
 400     REFCLSID rclsid,
 401     ULONG cCategories,
 402     CATID *rgcatid)
 403 {
 404     TRACE("\n");
 405
 406     return COMCAT_RegisterClassCategories(
 407         rclsid, impl_keyname, cCategories, rgcatid);
 408 }
 409
 410 /**********************************************************************
 411  * COMCAT_ICatRegister_UnRegisterClassImplCategories
 412  */
 413 static HRESULT WINAPI COMCAT_ICatRegister_UnRegisterClassImplCategories(
 414     LPCATREGISTER iface,
 415     REFCLSID rclsid,
 416     ULONG cCategories,
 417     CATID *rgcatid)
 418 {
 419     TRACE("\n");
 420
 421     return COMCAT_UnRegisterClassCategories(
 422         rclsid, impl_keyname, cCategories, rgcatid);
 423 }
 424
 425 /**********************************************************************
 426  * COMCAT_ICatRegister_RegisterClassReqCategories
 427  */
 428 static HRESULT WINAPI COMCAT_ICatRegister_RegisterClassReqCategories(
 429     LPCATREGISTER iface,
 430     REFCLSID rclsid,
 431     ULONG cCategories,
 432     CATID *rgcatid)
 433 {
 434     TRACE("\n");
 435
 436     return COMCAT_RegisterClassCategories(
 437         rclsid, req_keyname, cCategories, rgcatid);
 438 }
 439
 440 /**********************************************************************
 441  * COMCAT_ICatRegister_UnRegisterClassReqCategories
 442  */
 443 static HRESULT WINAPI COMCAT_ICatRegister_UnRegisterClassReqCategories(
 444     LPCATREGISTER iface,
 445     REFCLSID rclsid,
 446     ULONG cCategories,
 447     CATID *rgcatid)
 448 {
 449     TRACE("\n");
 450
 451     return COMCAT_UnRegisterClassCategories(
 452         rclsid, req_keyname, cCategories, rgcatid);
 453 }
 454
 455 /**********************************************************************
 456  * COMCAT_ICatInformation_QueryInterface
 457  */
 458 static HRESULT WINAPI COMCAT_ICatInformation_QueryInterface(
 459     LPCATINFORMATION iface,
 460     REFIID riid,
 461     LPVOID *ppvObj)
 462 {
 463     ComCatMgrImpl *This = impl_from_ICatInformation( iface );
 464     return IUnknown_QueryInterface((LPUNKNOWN)This, riid, ppvObj);
 465 }
 466
 467 /**********************************************************************
 468  * COMCAT_ICatInformation_AddRef
 469  */
 470 static ULONG WINAPI COMCAT_ICatInformation_AddRef(LPCATINFORMATION iface)
 471 {
 472     ComCatMgrImpl *This = impl_from_ICatInformation( iface );
 473     return IUnknown_AddRef((LPUNKNOWN)This);
 474 }
 475
 476 /**********************************************************************
 477  * COMCAT_ICatInformation_Release
 478  */
 479 static ULONG WINAPI COMCAT_ICatInformation_Release(LPCATINFORMATION iface)
 480 {
 481     ComCatMgrImpl *This = impl_from_ICatInformation( iface );
 482     return IUnknown_Release((LPUNKNOWN)This);
 483 }
 484
 485 /**********************************************************************
 486  * COMCAT_ICatInformation_EnumCategories
 487  */
 488 static HRESULT WINAPI COMCAT_ICatInformation_EnumCategories(
 489     LPCATINFORMATION iface,
 490     LCID lcid,
 491     LPENUMCATEGORYINFO *ppenumCatInfo)
 492 {
 493     TRACE("\n");
 494
 495     if (ppenumCatInfo == NULL) return E_POINTER;
 496
 497     *ppenumCatInfo = COMCAT_IEnumCATEGORYINFO_Construct(lcid);
 498     if (*ppenumCatInfo == NULL) return E_OUTOFMEMORY;
 499     IEnumCATEGORYINFO_AddRef(*ppenumCatInfo);
 500     return S_OK;
 501 }
 502
 503 /**********************************************************************
 504  * COMCAT_ICatInformation_GetCategoryDesc
 505  */
 506 static HRESULT WINAPI COMCAT_ICatInformation_GetCategoryDesc(
 507     LPCATINFORMATION iface,
 508     REFCATID rcatid,
 509     LCID lcid,
 510     PWCHAR *ppszDesc)
 511 {
 512     WCHAR keyname[60] = { 'C', 'o', 'm', 'p', 'o', 'n', 'e', 'n',
 513                           't', ' ', 'C', 'a', 't', 'e', 'g', 'o',
 514                           'r', 'i', 'e', 's', '\\', 0 };
 515     HKEY key;
 516     HRESULT res;
 517
 518     TRACE("\n\tCATID:\t%s\n\tLCID:\t%X\n",debugstr_guid(rcatid), lcid);
 519
 520     if (rcatid == NULL || ppszDesc == NULL) return E_INVALIDARG;
 521
 522     /* Open the key for this category. */
 523     if (!StringFromGUID2(rcatid, keyname + 21, 39)) return E_FAIL;
 524     res = RegOpenKeyExW(HKEY_CLASSES_ROOT, keyname, 0, KEY_READ, &key);
 525     if (res != ERROR_SUCCESS) return CAT_E_CATIDNOEXIST;
 526
 527     /* Allocate a sensible amount of memory for the description. */
 528     *ppszDesc = CoTaskMemAlloc(128 * sizeof(WCHAR));
 529     if (*ppszDesc == NULL) {
 530         RegCloseKey(key);
 531         return E_OUTOFMEMORY;
 532     }
 533
 534     /* Get the description, and make sure it's null terminated. */
 535     res = COMCAT_GetCategoryDesc(key, lcid, *ppszDesc, 128);
 536     RegCloseKey(key);
 537     if (FAILED(res)) {
 538         CoTaskMemFree(*ppszDesc);
 539         return res;
 540     }
 541
 542     return S_OK;
 543 }
 544
 545 /**********************************************************************
 546  * COMCAT_ICatInformation_EnumClassesOfCategories
 547  */
 548 static HRESULT WINAPI COMCAT_ICatInformation_EnumClassesOfCategories(
 549     LPCATINFORMATION iface,
 550     ULONG cImplemented,
 551     CATID *rgcatidImpl,
 552     ULONG cRequired,
 553     CATID *rgcatidReq,
 554     LPENUMCLSID *ppenumCLSID)
 555 {
 556     struct class_categories *categories;
 557
 558     TRACE("\n");
 559
 560         if (cImplemented == (ULONG)-1)
 561                 cImplemented = 0;
 562         if (cRequired == (ULONG)-1)
 563                 cRequired = 0;
 564
 565     if (ppenumCLSID == NULL ||
 566         (cImplemented && rgcatidImpl == NULL) ||
 567         (cRequired && rgcatidReq == NULL)) return E_POINTER;
 568
 569     categories = COMCAT_PrepareClassCategories(cImplemented, rgcatidImpl,
 570                                                cRequired, rgcatidReq);
 571     if (categories == NULL) return E_OUTOFMEMORY;
 572     *ppenumCLSID = COMCAT_CLSID_IEnumGUID_Construct(categories);
 573     if (*ppenumCLSID == NULL) {
 574         HeapFree(GetProcessHeap(), 0, categories);
 575         return E_OUTOFMEMORY;
 576     }
 577     IEnumGUID_AddRef(*ppenumCLSID);
 578     return S_OK;
 579 }
 580
 581 /**********************************************************************
 582  * COMCAT_ICatInformation_IsClassOfCategories
 583  */
 584 static HRESULT WINAPI COMCAT_ICatInformation_IsClassOfCategories(
 585     LPCATINFORMATION iface,
 586     REFCLSID rclsid,
 587     ULONG cImplemented,
 588     CATID *rgcatidImpl,
 589     ULONG cRequired,
 590     CATID *rgcatidReq)
 591 {
 592     WCHAR keyname[45] = { 'C', 'L', 'S', 'I', 'D', '\\', 0 };
 593     HRESULT res;
 594     struct class_categories *categories;
 595     HKEY key;
 596
 597     if (WINE_TRACE_ON(ole)) {
 598         ULONG count;
 599         TRACE("\n\tCLSID:\t%s\n\tImplemented %u\n",debugstr_guid(rclsid),cImplemented);
 600         for (count = 0; count < cImplemented; ++count)
 601             TRACE("\t\t%s\n",debugstr_guid(&rgcatidImpl[count]));
 602         TRACE("\tRequired %u\n",cRequired);
 603         for (count = 0; count < cRequired; ++count)
 604             TRACE("\t\t%s\n",debugstr_guid(&rgcatidReq[count]));
 605     }
 606
 607     if ((cImplemented && rgcatidImpl == NULL) ||
 608         (cRequired && rgcatidReq == NULL)) return E_POINTER;
 609
 610     res = StringFromGUID2(rclsid, keyname + 6, 39);
 611     if (FAILED(res)) return res;
 612
 613     categories = COMCAT_PrepareClassCategories(cImplemented, rgcatidImpl,
 614                                                cRequired, rgcatidReq);
 615     if (categories == NULL) return E_OUTOFMEMORY;
 616
 617     res = RegOpenKeyExW(HKEY_CLASSES_ROOT, keyname, 0, KEY_READ, &key);
 618     if (res == ERROR_SUCCESS) {
 619         res = COMCAT_IsClassOfCategories(key, categories);
 620         RegCloseKey(key);
 621     } else res = S_FALSE;
 622
 623     HeapFree(GetProcessHeap(), 0, categories);
 624
 625     return res;
 626 }
 627
 628 /**********************************************************************
 629  * COMCAT_ICatInformation_EnumImplCategoriesOfClass
 630  */
 631 static HRESULT WINAPI COMCAT_ICatInformation_EnumImplCategoriesOfClass(
 632     LPCATINFORMATION iface,
 633     REFCLSID rclsid,
 634     LPENUMCATID *ppenumCATID)
 635 {
 636     static const WCHAR postfix[24] = { '\\', 'I', 'm', 'p', 'l', 'e', 'm', 'e',
 637                           'n', 't', 'e', 'd', ' ', 'C', 'a', 't',
 638                           'e', 'g', 'o', 'r', 'i', 'e', 's', 0 };
 639
 640     TRACE("\n\tCLSID:\t%s\n",debugstr_guid(rclsid));
 641
 642     if (rclsid == NULL || ppenumCATID == NULL)
 643         return E_POINTER;
 644
 645     *ppenumCATID = COMCAT_CATID_IEnumGUID_Construct(rclsid, postfix);
 646     if (*ppenumCATID == NULL) return E_OUTOFMEMORY;
 647     return S_OK;
 648 }
 649
 650 /**********************************************************************
 651  * COMCAT_ICatInformation_EnumReqCategoriesOfClass
 652  */
 653 static HRESULT WINAPI COMCAT_ICatInformation_EnumReqCategoriesOfClass(
 654     LPCATINFORMATION iface,
 655     REFCLSID rclsid,
 656     LPENUMCATID *ppenumCATID)
 657 {
 658     static const WCHAR postfix[21] = { '\\', 'R', 'e', 'q', 'u', 'i', 'r', 'e',
 659                           'd', ' ', 'C', 'a', 't', 'e', 'g', 'o',
 660                           'r', 'i', 'e', 's', 0 };
 661
 662     TRACE("\n\tCLSID:\t%s\n",debugstr_guid(rclsid));
 663
 664     if (rclsid == NULL || ppenumCATID == NULL)
 665         return E_POINTER;
 666
 667     *ppenumCATID = COMCAT_CATID_IEnumGUID_Construct(rclsid, postfix);
 668     if (*ppenumCATID == NULL) return E_OUTOFMEMORY;
 669     return S_OK;
 670 }
 671
 672 /**********************************************************************
 673  * COMCAT_ICatRegister_Vtbl
 674  */
 675 static const ICatRegisterVtbl COMCAT_ICatRegister_Vtbl =
 676 {
 677     COMCAT_ICatRegister_QueryInterface,
 678     COMCAT_ICatRegister_AddRef,
 679     COMCAT_ICatRegister_Release,
 680     COMCAT_ICatRegister_RegisterCategories,
 681     COMCAT_ICatRegister_UnRegisterCategories,
 682     COMCAT_ICatRegister_RegisterClassImplCategories,
 683     COMCAT_ICatRegister_UnRegisterClassImplCategories,
 684     COMCAT_ICatRegister_RegisterClassReqCategories,
 685     COMCAT_ICatRegister_UnRegisterClassReqCategories
 686 };
 687
 688
 689 /**********************************************************************
 690  * COMCAT_ICatInformation_Vtbl
 691  */
 692 static const ICatInformationVtbl COMCAT_ICatInformation_Vtbl =
 693 {
 694     COMCAT_ICatInformation_QueryInterface,
 695     COMCAT_ICatInformation_AddRef,
 696     COMCAT_ICatInformation_Release,
 697     COMCAT_ICatInformation_EnumCategories,
 698     COMCAT_ICatInformation_GetCategoryDesc,
 699     COMCAT_ICatInformation_EnumClassesOfCategories,
 700     COMCAT_ICatInformation_IsClassOfCategories,
 701     COMCAT_ICatInformation_EnumImplCategoriesOfClass,
 702     COMCAT_ICatInformation_EnumReqCategoriesOfClass
 703 };
 704
 705 /**********************************************************************
 706  * static ComCatMgr instance
 707  */
 708 static ComCatMgrImpl COMCAT_ComCatMgr =
 709 {
 710     &COMCAT_ICatRegister_Vtbl,
 711     &COMCAT_ICatInformation_Vtbl
 712 };
 713
 714 /**********************************************************************
 715  * COMCAT_IClassFactory_QueryInterface (also IUnknown)
 716  */
 717 static HRESULT WINAPI COMCAT_IClassFactory_QueryInterface(
 718     LPCLASSFACTORY iface,
 719     REFIID riid,
 720     LPVOID *ppvObj)
 721 {
 722     TRACE("\n\tIID:\t%s\n",debugstr_guid(riid));
 723
 724     if (ppvObj == NULL) return E_POINTER;
 725
 726     if (IsEqualGUID(riid, &IID_IUnknown) ||
 727         IsEqualGUID(riid, &IID_IClassFactory))
 728     {
 729         *ppvObj = (LPVOID)iface;
 730         IUnknown_AddRef(iface);
 731         return S_OK;
 732     }
 733
 734     return E_NOINTERFACE;
 735 }
 736
 737 /**********************************************************************
 738  * COMCAT_IClassFactory_AddRef (also IUnknown)
 739  */
 740 static ULONG WINAPI COMCAT_IClassFactory_AddRef(LPCLASSFACTORY iface)
 741 {
 742     return 2; /* non-heap based object */
 743 }
 744
 745 /**********************************************************************
 746  * COMCAT_IClassFactory_Release (also IUnknown)
 747  */
 748 static ULONG WINAPI COMCAT_IClassFactory_Release(LPCLASSFACTORY iface)
 749 {
 750     return 1; /* non-heap based object */
 751 }
 752
 753 /**********************************************************************
 754  * COMCAT_IClassFactory_CreateInstance
 755  */
 756 static HRESULT WINAPI COMCAT_IClassFactory_CreateInstance(
 757     LPCLASSFACTORY iface,
 758     LPUNKNOWN pUnkOuter,
 759     REFIID riid,
 760     LPVOID *ppvObj)
 761 {
 762     HRESULT res;
 763     TRACE("\n\tIID:\t%s\n",debugstr_guid(riid));
 764
 765     if (ppvObj == NULL) return E_POINTER;
 766
 767     /* Don't support aggregation (Windows doesn't) */
 768     if (pUnkOuter != NULL) return CLASS_E_NOAGGREGATION;
 769
 770     res = IUnknown_QueryInterface((LPUNKNOWN)&COMCAT_ComCatMgr, riid, ppvObj);
 771     if (SUCCEEDED(res)) {
 772         return res;
 773     }
 774
 775     return CLASS_E_CLASSNOTAVAILABLE;
 776 }
 777
 778 /**********************************************************************
 779  * COMCAT_IClassFactory_LockServer
 780  */
 781 static HRESULT WINAPI COMCAT_IClassFactory_LockServer(
 782     LPCLASSFACTORY iface,
 783     BOOL fLock)
 784 {
 785     FIXME("(%d), stub!\n",fLock);
 786     return S_OK;
 787 }
 788
 789 /**********************************************************************
 790  * static ClassFactory instance
 791  */
 792 static const IClassFactoryVtbl ComCatCFVtbl =
 793 {
 794     COMCAT_IClassFactory_QueryInterface,
 795     COMCAT_IClassFactory_AddRef,
 796     COMCAT_IClassFactory_Release,
 797     COMCAT_IClassFactory_CreateInstance,
 798     COMCAT_IClassFactory_LockServer
 799 };
 800
 801 static const IClassFactoryVtbl *ComCatCF = &ComCatCFVtbl;
 802
 803 HRESULT ComCatCF_Create(REFIID riid, LPVOID *ppv)
 804 {
 805     return IClassFactory_QueryInterface((IClassFactory *)&ComCatCF, riid, ppv);
 806 }
 807
 808 /**********************************************************************
 809  * IEnumCATEGORYINFO implementation
 810  *
 811  * This implementation is not thread-safe.  The manager itself is, but
 812  * I can't imagine a valid use of an enumerator in several threads.
 813  */
 814 typedef struct
 815 {
 816     const IEnumCATEGORYINFOVtbl *lpVtbl;
 817     LONG  ref;
 818     LCID  lcid;
 819     HKEY  key;
 820     DWORD next_index;
 821 } IEnumCATEGORYINFOImpl;
 822
 823 static ULONG WINAPI COMCAT_IEnumCATEGORYINFO_AddRef(LPENUMCATEGORYINFO iface)
 824 {
 825     IEnumCATEGORYINFOImpl *This = (IEnumCATEGORYINFOImpl *)iface;
 826
 827     TRACE("\n");
 828
 829     return InterlockedIncrement(&This->ref);
 830 }
 831
 832 static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_QueryInterface(
 833     LPENUMCATEGORYINFO iface,
 834     REFIID riid,
 835     LPVOID *ppvObj)
 836 {
 837     TRACE("\n\tIID:\t%s\n",debugstr_guid(riid));
 838
 839     if (ppvObj == NULL) return E_POINTER;
 840
 841     if (IsEqualGUID(riid, &IID_IUnknown) ||
 842         IsEqualGUID(riid, &IID_IEnumCATEGORYINFO))
 843     {
 844         *ppvObj = (LPVOID)iface;
 845         COMCAT_IEnumCATEGORYINFO_AddRef(iface);
 846         return S_OK;
 847     }
 848
 849     return E_NOINTERFACE;
 850 }
 851
 852 static ULONG WINAPI COMCAT_IEnumCATEGORYINFO_Release(LPENUMCATEGORYINFO iface)
 853 {
 854     IEnumCATEGORYINFOImpl *This = (IEnumCATEGORYINFOImpl *)iface;
 855     ULONG ref;
 856
 857     TRACE("\n");
 858
 859     ref = InterlockedDecrement(&This->ref);
 860     if (ref == 0) {
 861         if (This->key) RegCloseKey(This->key);
 862         HeapFree(GetProcessHeap(), 0, This);
 863         return 0;
 864     }
 865     return ref;
 866 }
 867
 868 static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Next(
 869     LPENUMCATEGORYINFO iface,
 870     ULONG celt,
 871     CATEGORYINFO *rgelt,
 872     ULONG *pceltFetched)
 873 {
 874     IEnumCATEGORYINFOImpl *This = (IEnumCATEGORYINFOImpl *)iface;
 875     ULONG fetched = 0;
 876
 877     TRACE("\n");
 878
 879     if (rgelt == NULL) return E_POINTER;
 880
 881     if (This->key) while (fetched < celt) {
 882         LSTATUS res;
 883         HRESULT hr;
 884         WCHAR catid[39];
 885         DWORD cName = 39;
 886         HKEY subkey;
 887
 888         res = RegEnumKeyExW(This->key, This->next_index, catid, &cName,
 889                             NULL, NULL, NULL, NULL);
 890         if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
 891         ++(This->next_index);
 892
 893         hr = CLSIDFromString(catid, &rgelt->catid);
 894         if (FAILED(hr)) continue;
 895
 896         res = RegOpenKeyExW(This->key, catid, 0, KEY_READ, &subkey);
 897         if (res != ERROR_SUCCESS) continue;
 898
 899         hr = COMCAT_GetCategoryDesc(subkey, This->lcid,
 900                                     rgelt->szDescription, 128);
 901         RegCloseKey(subkey);
 902         if (FAILED(hr)) continue;
 903
 904         rgelt->lcid = This->lcid;
 905         ++fetched;
 906         ++rgelt;
 907     }
 908
 909     if (pceltFetched) *pceltFetched = fetched;
 910     return fetched == celt ? S_OK : S_FALSE;
 911 }
 912
 913 static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Skip(
 914     LPENUMCATEGORYINFO iface,
 915     ULONG celt)
 916 {
 917     IEnumCATEGORYINFOImpl *This = (IEnumCATEGORYINFOImpl *)iface;
 918
 919     TRACE("\n");
 920
 921     This->next_index += celt;
 922     /* This should return S_FALSE when there aren't celt elems to skip. */
 923     return S_OK;
 924 }
 925
 926 static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Reset(LPENUMCATEGORYINFO iface)
 927 {
 928     IEnumCATEGORYINFOImpl *This = (IEnumCATEGORYINFOImpl *)iface;
 929
 930     TRACE("\n");
 931
 932     This->next_index = 0;
 933     return S_OK;
 934 }
 935
 936 static HRESULT WINAPI COMCAT_IEnumCATEGORYINFO_Clone(
 937     LPENUMCATEGORYINFO iface,
 938     IEnumCATEGORYINFO **ppenum)
 939 {
 940     IEnumCATEGORYINFOImpl *This = (IEnumCATEGORYINFOImpl *)iface;
 941     static const WCHAR keyname[] = { 'C', 'o', 'm', 'p', 'o', 'n', 'e', 'n',
 942                                      't', ' ', 'C', 'a', 't', 'e', 'g', 'o',
 943                                      'r', 'i', 'e', 's', 0 };
 944     IEnumCATEGORYINFOImpl *new_this;
 945
 946     TRACE("\n");
 947
 948     if (ppenum == NULL) return E_POINTER;
 949
 950     new_this = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IEnumCATEGORYINFOImpl));
 951     if (new_this == NULL) return E_OUTOFMEMORY;
 952
 953     new_this->lpVtbl = This->lpVtbl;
 954     new_this->ref = 1;
 955     new_this->lcid = This->lcid;
 956     /* FIXME: could we more efficiently use DuplicateHandle? */
 957     RegOpenKeyExW(HKEY_CLASSES_ROOT, keyname, 0, KEY_READ, &new_this->key);
 958     new_this->next_index = This->next_index;
 959
 960     *ppenum = (LPENUMCATEGORYINFO)new_this;
 961     return S_OK;
 962 }
 963
 964 static const IEnumCATEGORYINFOVtbl COMCAT_IEnumCATEGORYINFO_Vtbl =
 965 {
 966     COMCAT_IEnumCATEGORYINFO_QueryInterface,
 967     COMCAT_IEnumCATEGORYINFO_AddRef,
 968     COMCAT_IEnumCATEGORYINFO_Release,
 969     COMCAT_IEnumCATEGORYINFO_Next,
 970     COMCAT_IEnumCATEGORYINFO_Skip,
 971     COMCAT_IEnumCATEGORYINFO_Reset,
 972     COMCAT_IEnumCATEGORYINFO_Clone
 973 };
 974
 975 static LPENUMCATEGORYINFO COMCAT_IEnumCATEGORYINFO_Construct(LCID lcid)
 976 {
 977     IEnumCATEGORYINFOImpl *This;
 978
 979     This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IEnumCATEGORYINFOImpl));
 980     if (This) {
 981         static const WCHAR keyname[] = { 'C', 'o', 'm', 'p', 'o', 'n', 'e', 'n',
 982                                          't', ' ', 'C', 'a', 't', 'e', 'g', 'o',
 983                                          'r', 'i', 'e', 's', 0 };
 984
 985         This->lpVtbl = &COMCAT_IEnumCATEGORYINFO_Vtbl;
 986         This->lcid = lcid;
 987         RegOpenKeyExW(HKEY_CLASSES_ROOT, keyname, 0, KEY_READ, &This->key);
 988     }
 989     return (LPENUMCATEGORYINFO)This;
 990 }
 991
 992 /**********************************************************************
 993  * ClassesOfCategories IEnumCLSID (IEnumGUID) implementation
 994  *
 995  * This implementation is not thread-safe.  The manager itself is, but
 996  * I can't imagine a valid use of an enumerator in several threads.
 997  */
 998 typedef struct
 999 {
1000     const IEnumGUIDVtbl *lpVtbl;
1001     LONG  ref;
1002     struct class_categories *categories;
1003     HKEY  key;
1004     DWORD next_index;
1005 } CLSID_IEnumGUIDImpl;
1006
1007 static ULONG WINAPI COMCAT_CLSID_IEnumGUID_AddRef(LPENUMGUID iface)
1008 {
1009     CLSID_IEnumGUIDImpl *This = (CLSID_IEnumGUIDImpl *)iface;
1010     TRACE("\n");
1011
1012     return InterlockedIncrement(&This->ref);
1013 }
1014
1015 static HRESULT WINAPI COMCAT_CLSID_IEnumGUID_QueryInterface(
1016     LPENUMGUID iface,
1017     REFIID riid,
1018     LPVOID *ppvObj)
1019 {
1020     TRACE("\n\tIID:\t%s\n",debugstr_guid(riid));
1021
1022     if (ppvObj == NULL) return E_POINTER;
1023
1024     if (IsEqualGUID(riid, &IID_IUnknown) ||
1025         IsEqualGUID(riid, &IID_IEnumGUID))
1026     {
1027         *ppvObj = (LPVOID)iface;
1028         COMCAT_CLSID_IEnumGUID_AddRef(iface);
1029         return S_OK;
1030     }
1031
1032     return E_NOINTERFACE;
1033 }
1034
1035 static ULONG WINAPI COMCAT_CLSID_IEnumGUID_Release(LPENUMGUID iface)
1036 {
1037     CLSID_IEnumGUIDImpl *This = (CLSID_IEnumGUIDImpl *)iface;
1038     ULONG ref;
1039
1040     TRACE("\n");
1041
1042     ref = InterlockedDecrement(&This->ref);
1043     if (ref == 0) {
1044         if (This->key) RegCloseKey(This->key);
1045         HeapFree(GetProcessHeap(), 0, (LPVOID)This->categories);
1046         HeapFree(GetProcessHeap(), 0, This);
1047         return 0;
1048     }
1049     return ref;
1050 }
1051
1052 static HRESULT WINAPI COMCAT_CLSID_IEnumGUID_Next(
1053     LPENUMGUID iface,
1054     ULONG celt,
1055     GUID *rgelt,
1056     ULONG *pceltFetched)
1057 {
1058     CLSID_IEnumGUIDImpl *This = (CLSID_IEnumGUIDImpl *)iface;
1059     ULONG fetched = 0;
1060
1061     TRACE("\n");
1062
1063     if (rgelt == NULL) return E_POINTER;
1064
1065     if (This->key) while (fetched < celt) {
1066         LSTATUS res;
1067         HRESULT hr;
1068         WCHAR clsid[39];
1069         DWORD cName = 39;
1070         HKEY subkey;
1071
1072         res = RegEnumKeyExW(This->key, This->next_index, clsid, &cName,
1073                             NULL, NULL, NULL, NULL);
1074         if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
1075         ++(This->next_index);
1076
1077         hr = CLSIDFromString(clsid, rgelt);
1078         if (FAILED(hr)) continue;
1079
1080         res = RegOpenKeyExW(This->key, clsid, 0, KEY_READ, &subkey);
1081         if (res != ERROR_SUCCESS) continue;
1082
1083         hr = COMCAT_IsClassOfCategories(subkey, This->categories);
1084         RegCloseKey(subkey);
1085         if (hr != S_OK) continue;
1086
1087         ++fetched;
1088         ++rgelt;
1089     }
1090
1091     if (pceltFetched) *pceltFetched = fetched;
1092     return fetched == celt ? S_OK : S_FALSE;
1093 }
1094
1095 static HRESULT WINAPI COMCAT_CLSID_IEnumGUID_Skip(
1096     LPENUMGUID iface,
1097     ULONG celt)
1098 {
1099     CLSID_IEnumGUIDImpl *This = (CLSID_IEnumGUIDImpl *)iface;
1100
1101     TRACE("\n");
1102
1103     This->next_index += celt;
1104     FIXME("Never returns S_FALSE\n");
1105     return S_OK;
1106 }
1107
1108 static HRESULT WINAPI COMCAT_CLSID_IEnumGUID_Reset(LPENUMGUID iface)
1109 {
1110     CLSID_IEnumGUIDImpl *This = (CLSID_IEnumGUIDImpl *)iface;
1111
1112     TRACE("\n");
1113
1114     This->next_index = 0;
1115     return S_OK;
1116 }
1117
1118 static HRESULT WINAPI COMCAT_CLSID_IEnumGUID_Clone(
1119     LPENUMGUID iface,
1120     IEnumGUID **ppenum)
1121 {
1122     CLSID_IEnumGUIDImpl *This = (CLSID_IEnumGUIDImpl *)iface;
1123     static const WCHAR keyname[] = { 'C', 'L', 'S', 'I', 'D', 0 };
1124     CLSID_IEnumGUIDImpl *new_this;
1125     DWORD size;
1126
1127     TRACE("\n");
1128
1129     if (ppenum == NULL) return E_POINTER;
1130
1131     new_this = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CLSID_IEnumGUIDImpl));
1132     if (new_this == NULL) return E_OUTOFMEMORY;
1133
1134     new_this->lpVtbl = This->lpVtbl;
1135     new_this->ref = 1;
1136     size = HeapSize(GetProcessHeap(), 0, (LPVOID)This->categories);
1137     new_this->categories =
1138         HeapAlloc(GetProcessHeap(), 0, size);
1139     if (new_this->categories == NULL) {
1140         HeapFree(GetProcessHeap(), 0, new_this);
1141         return E_OUTOFMEMORY;
1142     }
1143     memcpy((LPVOID)new_this->categories, This->categories, size);
1144     /* FIXME: could we more efficiently use DuplicateHandle? */
1145     RegOpenKeyExW(HKEY_CLASSES_ROOT, keyname, 0, KEY_READ, &new_this->key);
1146     new_this->next_index = This->next_index;
1147
1148     *ppenum = (LPENUMGUID)new_this;
1149     return S_OK;
1150 }
1151
1152 static const IEnumGUIDVtbl COMCAT_CLSID_IEnumGUID_Vtbl =
1153 {
1154     COMCAT_CLSID_IEnumGUID_QueryInterface,
1155     COMCAT_CLSID_IEnumGUID_AddRef,
1156     COMCAT_CLSID_IEnumGUID_Release,
1157     COMCAT_CLSID_IEnumGUID_Next,
1158     COMCAT_CLSID_IEnumGUID_Skip,
1159     COMCAT_CLSID_IEnumGUID_Reset,
1160     COMCAT_CLSID_IEnumGUID_Clone
1161 };
1162
1163 static LPENUMGUID COMCAT_CLSID_IEnumGUID_Construct(struct class_categories *categories)
1164 {
1165     CLSID_IEnumGUIDImpl *This;
1166
1167     This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CLSID_IEnumGUIDImpl));
1168     if (This) {
1169         static const WCHAR keyname[] = { 'C', 'L', 'S', 'I', 'D', 0 };
1170
1171         This->lpVtbl = &COMCAT_CLSID_IEnumGUID_Vtbl;
1172         This->categories = categories;
1173         RegOpenKeyExW(HKEY_CLASSES_ROOT, keyname, 0, KEY_READ, &This->key);
1174     }
1175     return (LPENUMGUID)This;
1176 }
1177
1178 /**********************************************************************
1179  * CategoriesOfClass IEnumCATID (IEnumGUID) implementation
1180  *
1181  * This implementation is not thread-safe.  The manager itself is, but
1182  * I can't imagine a valid use of an enumerator in several threads.
1183  */
1184 typedef struct
1185 {
1186     const IEnumGUIDVtbl *lpVtbl;
1187     LONG  ref;
1188     WCHAR keyname[68];
1189     HKEY  key;
1190     DWORD next_index;
1191 } CATID_IEnumGUIDImpl;
1192
1193 static ULONG WINAPI COMCAT_CATID_IEnumGUID_AddRef(LPENUMGUID iface)
1194 {
1195     CATID_IEnumGUIDImpl *This = (CATID_IEnumGUIDImpl *)iface;
1196     TRACE("\n");
1197
1198     return InterlockedIncrement(&This->ref);
1199 }
1200
1201 static HRESULT WINAPI COMCAT_CATID_IEnumGUID_QueryInterface(
1202     LPENUMGUID iface,
1203     REFIID riid,
1204     LPVOID *ppvObj)
1205 {
1206     TRACE("\n\tIID:\t%s\n",debugstr_guid(riid));
1207
1208     if (ppvObj == NULL) return E_POINTER;
1209
1210     if (IsEqualGUID(riid, &IID_IUnknown) ||
1211         IsEqualGUID(riid, &IID_IEnumGUID))
1212     {
1213         *ppvObj = (LPVOID)iface;
1214         COMCAT_CATID_IEnumGUID_AddRef(iface);
1215         return S_OK;
1216     }
1217
1218     return E_NOINTERFACE;
1219 }
1220
1221 static ULONG WINAPI COMCAT_CATID_IEnumGUID_Release(LPENUMGUID iface)
1222 {
1223     CATID_IEnumGUIDImpl *This = (CATID_IEnumGUIDImpl *)iface;
1224     ULONG ref;
1225
1226     TRACE("\n");
1227
1228     ref = InterlockedDecrement(&This->ref);
1229     if (ref == 0) {
1230         if (This->key) RegCloseKey(This->key);
1231         HeapFree(GetProcessHeap(), 0, This);
1232         return 0;
1233     }
1234     return ref;
1235 }
1236
1237 static HRESULT WINAPI COMCAT_CATID_IEnumGUID_Next(
1238     LPENUMGUID iface,
1239     ULONG celt,
1240     GUID *rgelt,
1241     ULONG *pceltFetched)
1242 {
1243     CATID_IEnumGUIDImpl *This = (CATID_IEnumGUIDImpl *)iface;
1244     ULONG fetched = 0;
1245
1246     TRACE("\n");
1247
1248     if (rgelt == NULL) return E_POINTER;
1249
1250     if (This->key) while (fetched < celt) {
1251         LSTATUS res;
1252         HRESULT hr;
1253         WCHAR catid[39];
1254         DWORD cName = 39;
1255
1256         res = RegEnumKeyExW(This->key, This->next_index, catid, &cName,
1257                             NULL, NULL, NULL, NULL);
1258         if (res != ERROR_SUCCESS && res != ERROR_MORE_DATA) break;
1259         ++(This->next_index);
1260
1261         hr = CLSIDFromString(catid, rgelt);
1262         if (FAILED(hr)) continue;
1263
1264         ++fetched;
1265         ++rgelt;
1266     }
1267
1268     if (pceltFetched) *pceltFetched = fetched;
1269     return fetched == celt ? S_OK : S_FALSE;
1270 }
1271
1272 static HRESULT WINAPI COMCAT_CATID_IEnumGUID_Skip(
1273     LPENUMGUID iface,
1274     ULONG celt)
1275 {
1276     CATID_IEnumGUIDImpl *This = (CATID_IEnumGUIDImpl *)iface;
1277
1278     TRACE("\n");
1279
1280     This->next_index += celt;
1281     FIXME("Never returns S_FALSE\n");
1282     return S_OK;
1283 }
1284
1285 static HRESULT WINAPI COMCAT_CATID_IEnumGUID_Reset(LPENUMGUID iface)
1286 {
1287     CATID_IEnumGUIDImpl *This = (CATID_IEnumGUIDImpl *)iface;
1288
1289     TRACE("\n");
1290
1291     This->next_index = 0;
1292     return S_OK;
1293 }
1294
1295 static HRESULT WINAPI COMCAT_CATID_IEnumGUID_Clone(
1296     LPENUMGUID iface,
1297     IEnumGUID **ppenum)
1298 {
1299     CATID_IEnumGUIDImpl *This = (CATID_IEnumGUIDImpl *)iface;
1300     CATID_IEnumGUIDImpl *new_this;
1301
1302     TRACE("\n");
1303
1304     if (ppenum == NULL) return E_POINTER;
1305
1306     new_this = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CATID_IEnumGUIDImpl));
1307     if (new_this == NULL) return E_OUTOFMEMORY;
1308
1309     new_this->lpVtbl = This->lpVtbl;
1310     new_this->ref = 1;
1311     lstrcpyW(new_this->keyname, This->keyname);
1312     /* FIXME: could we more efficiently use DuplicateHandle? */
1313     RegOpenKeyExW(HKEY_CLASSES_ROOT, new_this->keyname, 0, KEY_READ, &new_this->key);
1314     new_this->next_index = This->next_index;
1315
1316     *ppenum = (LPENUMGUID)new_this;
1317     return S_OK;
1318 }
1319
1320 static const IEnumGUIDVtbl COMCAT_CATID_IEnumGUID_Vtbl =
1321 {
1322     COMCAT_CATID_IEnumGUID_QueryInterface,
1323     COMCAT_CATID_IEnumGUID_AddRef,
1324     COMCAT_CATID_IEnumGUID_Release,
1325     COMCAT_CATID_IEnumGUID_Next,
1326     COMCAT_CATID_IEnumGUID_Skip,
1327     COMCAT_CATID_IEnumGUID_Reset,
1328     COMCAT_CATID_IEnumGUID_Clone
1329 };
1330
1331 static LPENUMGUID COMCAT_CATID_IEnumGUID_Construct(
1332     REFCLSID rclsid, LPCWSTR postfix)
1333 {
1334     CATID_IEnumGUIDImpl *This;
1335
1336     This = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(CATID_IEnumGUIDImpl));
1337     if (This) {
1338         WCHAR prefix[6] = { 'C', 'L', 'S', 'I', 'D', '\\' };
1339
1340         This->lpVtbl = &COMCAT_CATID_IEnumGUID_Vtbl;
1341         memcpy(This->keyname, prefix, sizeof(prefix));
1342         StringFromGUID2(rclsid, This->keyname + 6, 39);
1343         lstrcpyW(This->keyname + 44, postfix);
1344         RegOpenKeyExW(HKEY_CLASSES_ROOT, This->keyname, 0, KEY_READ, &This->key);
1345     }
1346     return (LPENUMGUID)This;
1347 }