dlls/mmdevapi/devenum.c

   1 /*
   2  * Copyright 2009 Maarten Lankhorst
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdarg.h>
  22
  23 #define NONAMELESSUNION
  24 #define COBJMACROS
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "winnls.h"
  28 #include "winreg.h"
  29 #include "wine/debug.h"
  30 #include "wine/unicode.h"
  31
  32 #include "ole2.h"
  33 #include "mmdeviceapi.h"
  34 #include "dshow.h"
  35 #include "dsound.h"
  36 #include "audioclient.h"
  37 #include "endpointvolume.h"
  38 #include "audiopolicy.h"
  39
  40 #include "mmdevapi.h"
  41 #include "devpkey.h"
  42
  43 WINE_DEFAULT_DEBUG_CHANNEL(mmdevapi);
  44
  45 static const WCHAR software_mmdevapi[] =
  46     { 'S','o','f','t','w','a','r','e','\\',
  47       'M','i','c','r','o','s','o','f','t','\\',
  48       'W','i','n','d','o','w','s','\\',
  49       'C','u','r','r','e','n','t','V','e','r','s','i','o','n','\\',
  50       'M','M','D','e','v','i','c','e','s','\\',
  51       'A','u','d','i','o',0};
  52 static const WCHAR reg_render[] =
  53     { 'R','e','n','d','e','r',0 };
  54 static const WCHAR reg_capture[] =
  55     { 'C','a','p','t','u','r','e',0 };
  56 static const WCHAR reg_devicestate[] =
  57     { 'D','e','v','i','c','e','S','t','a','t','e',0 };
  58 static const WCHAR reg_properties[] =
  59     { 'P','r','o','p','e','r','t','i','e','s',0 };
  60
  61 static HKEY key_render;
  62 static HKEY key_capture;
  63
  64 typedef struct MMDevPropStoreImpl
  65 {
  66     IPropertyStore IPropertyStore_iface;
  67     LONG ref;
  68     MMDevice *parent;
  69     DWORD access;
  70 } MMDevPropStore;
  71
  72 typedef struct MMDevEnumImpl
  73 {
  74     IMMDeviceEnumerator IMMDeviceEnumerator_iface;
  75     LONG ref;
  76 } MMDevEnumImpl;
  77
  78 static MMDevEnumImpl *MMDevEnumerator;
  79 static MMDevice **MMDevice_head;
  80 static MMDevice *MMDevice_def_rec, *MMDevice_def_play;
  81 static DWORD MMDevice_count;
  82 static const IMMDeviceEnumeratorVtbl MMDevEnumVtbl;
  83 static const IMMDeviceCollectionVtbl MMDevColVtbl;
  84 static const IMMDeviceVtbl MMDeviceVtbl;
  85 static const IPropertyStoreVtbl MMDevPropVtbl;
  86 static const IMMEndpointVtbl MMEndpointVtbl;
  87
  88 typedef struct MMDevColImpl
  89 {
  90     IMMDeviceCollection IMMDeviceCollection_iface;
  91     LONG ref;
  92     EDataFlow flow;
  93     DWORD state;
  94 } MMDevColImpl;
  95
  96 typedef struct IPropertyBagImpl {
  97     IPropertyBag IPropertyBag_iface;
  98     GUID devguid;
  99 } IPropertyBagImpl;
 100
 101 static const IPropertyBagVtbl PB_Vtbl;
 102
 103 static HRESULT MMDevPropStore_Create(MMDevice *This, DWORD access, IPropertyStore **ppv);
 104
 105 static inline MMDevPropStore *impl_from_IPropertyStore(IPropertyStore *iface)
 106 {
 107     return CONTAINING_RECORD(iface, MMDevPropStore, IPropertyStore_iface);
 108 }
 109
 110 static inline MMDevEnumImpl *impl_from_IMMDeviceEnumerator(IMMDeviceEnumerator *iface)
 111 {
 112     return CONTAINING_RECORD(iface, MMDevEnumImpl, IMMDeviceEnumerator_iface);
 113 }
 114
 115 static inline MMDevColImpl *impl_from_IMMDeviceCollection(IMMDeviceCollection *iface)
 116 {
 117     return CONTAINING_RECORD(iface, MMDevColImpl, IMMDeviceCollection_iface);
 118 }
 119
 120 static inline IPropertyBagImpl *impl_from_IPropertyBag(IPropertyBag *iface)
 121 {
 122     return CONTAINING_RECORD(iface, IPropertyBagImpl, IPropertyBag_iface);
 123 }
 124
 125 static const WCHAR propkey_formatW[] = {
 126     '{','%','0','8','X','-','%','0','4','X','-',
 127     '%','0','4','X','-','%','0','2','X','%','0','2','X','-',
 128     '%','0','2','X','%','0','2','X','%','0','2','X','%','0','2','X',
 129     '%','0','2','X','%','0','2','X','}',',','%','d',0 };
 130
 131 static HRESULT MMDevPropStore_OpenPropKey(const GUID *guid, DWORD flow, HKEY *propkey)
 132 {
 133     WCHAR buffer[39];
 134     LONG ret;
 135     HKEY key;
 136     StringFromGUID2(guid, buffer, 39);
 137     if ((ret = RegOpenKeyExW(flow == eRender ? key_render : key_capture, buffer, 0, KEY_READ|KEY_WRITE, &key)) != ERROR_SUCCESS)
 138     {
 139         WARN("Opening key %s failed with %u\n", debugstr_w(buffer), ret);
 140         return E_FAIL;
 141     }
 142     ret = RegOpenKeyExW(key, reg_properties, 0, KEY_READ|KEY_WRITE, propkey);
 143     RegCloseKey(key);
 144     if (ret != ERROR_SUCCESS)
 145     {
 146         WARN("Opening key %s failed with %u\n", debugstr_w(reg_properties), ret);
 147         return E_FAIL;
 148     }
 149     return S_OK;
 150 }
 151
 152 HRESULT MMDevice_GetPropValue(const GUID *devguid, DWORD flow, REFPROPERTYKEY key, PROPVARIANT *pv)
 153 {
 154     WCHAR buffer[80];
 155     const GUID *id = &key->fmtid;
 156     DWORD type, size;
 157     HRESULT hr = S_OK;
 158     HKEY regkey;
 159     LONG ret;
 160
 161     hr = MMDevPropStore_OpenPropKey(devguid, flow, &regkey);
 162     if (FAILED(hr))
 163         return hr;
 164     wsprintfW( buffer, propkey_formatW, id->Data1, id->Data2, id->Data3,
 165                id->Data4[0], id->Data4[1], id->Data4[2], id->Data4[3],
 166                id->Data4[4], id->Data4[5], id->Data4[6], id->Data4[7], key->pid );
 167     ret = RegGetValueW(regkey, NULL, buffer, RRF_RT_ANY, &type, NULL, &size);
 168     if (ret != ERROR_SUCCESS)
 169     {
 170         WARN("Reading %s returned %d\n", debugstr_w(buffer), ret);
 171         RegCloseKey(regkey);
 172         PropVariantClear(pv);
 173         return S_OK;
 174     }
 175
 176     switch (type)
 177     {
 178         case REG_SZ:
 179         {
 180             pv->vt = VT_LPWSTR;
 181             pv->u.pwszVal = CoTaskMemAlloc(size);
 182             if (!pv->u.pwszVal)
 183                 hr = E_OUTOFMEMORY;
 184             else
 185                 RegGetValueW(regkey, NULL, buffer, RRF_RT_REG_SZ, NULL, (BYTE*)pv->u.pwszVal, &size);
 186             break;
 187         }
 188         case REG_DWORD:
 189         {
 190             pv->vt = VT_UI4;
 191             RegGetValueW(regkey, NULL, buffer, RRF_RT_REG_DWORD, NULL, (BYTE*)&pv->u.ulVal, &size);
 192             break;
 193         }
 194         case REG_BINARY:
 195         {
 196             pv->vt = VT_BLOB;
 197             pv->u.blob.cbSize = size;
 198             pv->u.blob.pBlobData = CoTaskMemAlloc(size);
 199             if (!pv->u.blob.pBlobData)
 200                 hr = E_OUTOFMEMORY;
 201             else
 202                 RegGetValueW(regkey, NULL, buffer, RRF_RT_REG_BINARY, NULL, (BYTE*)pv->u.blob.pBlobData, &size);
 203             break;
 204         }
 205         default:
 206             ERR("Unknown/unhandled type: %u\n", type);
 207             PropVariantClear(pv);
 208             break;
 209     }
 210     RegCloseKey(regkey);
 211     return hr;
 212 }
 213
 214 static HRESULT MMDevice_SetPropValue(const GUID *devguid, DWORD flow, REFPROPERTYKEY key, REFPROPVARIANT pv)
 215 {
 216     WCHAR buffer[80];
 217     const GUID *id = &key->fmtid;
 218     HRESULT hr;
 219     HKEY regkey;
 220     LONG ret;
 221
 222     hr = MMDevPropStore_OpenPropKey(devguid, flow, &regkey);
 223     if (FAILED(hr))
 224         return hr;
 225     wsprintfW( buffer, propkey_formatW, id->Data1, id->Data2, id->Data3,
 226                id->Data4[0], id->Data4[1], id->Data4[2], id->Data4[3],
 227                id->Data4[4], id->Data4[5], id->Data4[6], id->Data4[7], key->pid );
 228     switch (pv->vt)
 229     {
 230         case VT_UI4:
 231         {
 232             ret = RegSetValueExW(regkey, buffer, 0, REG_DWORD, (const BYTE*)&pv->u.ulVal, sizeof(DWORD));
 233             break;
 234         }
 235         case VT_BLOB:
 236         {
 237             ret = RegSetValueExW(regkey, buffer, 0, REG_BINARY, pv->u.blob.pBlobData, pv->u.blob.cbSize);
 238             TRACE("Blob %p %u\n", pv->u.blob.pBlobData, pv->u.blob.cbSize);
 239
 240             break;
 241         }
 242         case VT_LPWSTR:
 243         {
 244             ret = RegSetValueExW(regkey, buffer, 0, REG_SZ, (const BYTE*)pv->u.pwszVal, sizeof(WCHAR)*(1+lstrlenW(pv->u.pwszVal)));
 245             break;
 246         }
 247         default:
 248             ret = 0;
 249             FIXME("Unhandled type %u\n", pv->vt);
 250             hr = E_INVALIDARG;
 251             break;
 252     }
 253     RegCloseKey(regkey);
 254     TRACE("Writing %s returned %u\n", debugstr_w(buffer), ret);
 255     return hr;
 256 }
 257
 258 /* Creates or updates the state of a device
 259  * If GUID is null, a random guid will be assigned
 260  * and the device will be created
 261  */
 262 static MMDevice *MMDevice_Create(WCHAR *name, void *devkey, GUID *id, EDataFlow flow, DWORD state, BOOL setdefault)
 263 {
 264     HKEY key, root;
 265     MMDevice *cur;
 266     WCHAR guidstr[39];
 267     DWORD i;
 268
 269     for (i = 0; i < MMDevice_count; ++i)
 270     {
 271         cur = MMDevice_head[i];
 272         if (cur->flow == flow && !lstrcmpW(cur->drv_id, name))
 273         {
 274             LONG ret;
 275             /* Same device, update state */
 276             cur->state = state;
 277             cur->key = devkey;
 278             StringFromGUID2(&cur->devguid, guidstr, sizeof(guidstr)/sizeof(*guidstr));
 279             ret = RegOpenKeyExW(flow == eRender ? key_render : key_capture, guidstr, 0, KEY_WRITE, &key);
 280             if (ret == ERROR_SUCCESS)
 281             {
 282                 RegSetValueExW(key, reg_devicestate, 0, REG_DWORD, (const BYTE*)&state, sizeof(DWORD));
 283                 RegCloseKey(key);
 284             }
 285             goto done;
 286         }
 287     }
 288
 289     /* No device found, allocate new one */
 290     cur = HeapAlloc(GetProcessHeap(), 0, sizeof(*cur));
 291     if (!cur){
 292         HeapFree(GetProcessHeap(), 0, devkey);
 293         return NULL;
 294     }
 295     cur->drv_id = HeapAlloc(GetProcessHeap(), 0, (lstrlenW(name)+1)*sizeof(WCHAR));
 296     if (!cur->drv_id)
 297     {
 298         HeapFree(GetProcessHeap(), 0, cur);
 299         HeapFree(GetProcessHeap(), 0, devkey);
 300         return NULL;
 301     }
 302     lstrcpyW(cur->drv_id, name);
 303     cur->key = devkey;
 304     cur->IMMDevice_iface.lpVtbl = &MMDeviceVtbl;
 305     cur->IMMEndpoint_iface.lpVtbl = &MMEndpointVtbl;
 306     cur->ref = 0;
 307     InitializeCriticalSection(&cur->crst);
 308     cur->crst.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": MMDevice.crst");
 309     cur->flow = flow;
 310     cur->state = state;
 311     if (!id)
 312     {
 313         id = &cur->devguid;
 314         CoCreateGuid(id);
 315     }
 316     cur->devguid = *id;
 317     StringFromGUID2(id, guidstr, sizeof(guidstr)/sizeof(*guidstr));
 318     if (flow == eRender)
 319         root = key_render;
 320     else
 321         root = key_capture;
 322     if (!RegCreateKeyExW(root, guidstr, 0, NULL, 0, KEY_WRITE|KEY_READ, NULL, &key, NULL))
 323     {
 324         HKEY keyprop;
 325         RegSetValueExW(key, reg_devicestate, 0, REG_DWORD, (const BYTE*)&state, sizeof(DWORD));
 326         if (!RegCreateKeyExW(key, reg_properties, 0, NULL, 0, KEY_WRITE|KEY_READ, NULL, &keyprop, NULL))
 327         {
 328             PROPVARIANT pv;
 329             pv.vt = VT_LPWSTR;
 330             pv.u.pwszVal = name;
 331             MMDevice_SetPropValue(id, flow, (const PROPERTYKEY*)&DEVPKEY_Device_FriendlyName, &pv);
 332             MMDevice_SetPropValue(id, flow, (const PROPERTYKEY*)&DEVPKEY_Device_DeviceDesc, &pv);
 333             RegCloseKey(keyprop);
 334         }
 335         RegCloseKey(key);
 336     }
 337     if (!MMDevice_head)
 338         MMDevice_head = HeapAlloc(GetProcessHeap(), 0, sizeof(*MMDevice_head));
 339     else
 340         MMDevice_head = HeapReAlloc(GetProcessHeap(), 0, MMDevice_head, sizeof(*MMDevice_head)*(1+MMDevice_count));
 341     MMDevice_head[MMDevice_count++] = cur;
 342
 343 done:
 344     if (setdefault)
 345     {
 346         if (flow == eRender)
 347             MMDevice_def_play = cur;
 348         else
 349             MMDevice_def_rec = cur;
 350     }
 351     return cur;
 352 }
 353
 354 static HRESULT load_devices_from_reg(void)
 355 {
 356     DWORD i = 0;
 357     HKEY root, cur;
 358     LONG ret;
 359     DWORD curflow;
 360
 361     ret = RegCreateKeyExW(HKEY_LOCAL_MACHINE, software_mmdevapi, 0, NULL, 0, KEY_WRITE|KEY_READ, NULL, &root, NULL);
 362     if (ret == ERROR_SUCCESS)
 363         ret = RegCreateKeyExW(root, reg_capture, 0, NULL, 0, KEY_READ|KEY_WRITE, NULL, &key_capture, NULL);
 364     if (ret == ERROR_SUCCESS)
 365         ret = RegCreateKeyExW(root, reg_render, 0, NULL, 0, KEY_READ|KEY_WRITE, NULL, &key_render, NULL);
 366     RegCloseKey(root);
 367     cur = key_capture;
 368     curflow = eCapture;
 369     if (ret != ERROR_SUCCESS)
 370     {
 371         RegCloseKey(key_capture);
 372         key_render = key_capture = NULL;
 373         WARN("Couldn't create key: %u\n", ret);
 374         return E_FAIL;
 375     }
 376
 377     do {
 378         WCHAR guidvalue[39];
 379         GUID guid;
 380         DWORD len;
 381         PROPVARIANT pv = { VT_EMPTY };
 382
 383         len = sizeof(guidvalue)/sizeof(guidvalue[0]);
 384         ret = RegEnumKeyExW(cur, i++, guidvalue, &len, NULL, NULL, NULL, NULL);
 385         if (ret == ERROR_NO_MORE_ITEMS)
 386         {
 387             if (cur == key_capture)
 388             {
 389                 cur = key_render;
 390                 curflow = eRender;
 391                 i = 0;
 392                 continue;
 393             }
 394             break;
 395         }
 396         if (ret != ERROR_SUCCESS)
 397             continue;
 398         if (SUCCEEDED(CLSIDFromString(guidvalue, &guid))
 399             && SUCCEEDED(MMDevice_GetPropValue(&guid, curflow, (const PROPERTYKEY*)&DEVPKEY_Device_FriendlyName, &pv))
 400             && pv.vt == VT_LPWSTR)
 401         {
 402             MMDevice_Create(pv.u.pwszVal, NULL, &guid, curflow,
 403                     DEVICE_STATE_NOTPRESENT, FALSE);
 404             CoTaskMemFree(pv.u.pwszVal);
 405         }
 406     } while (1);
 407
 408     return S_OK;
 409 }
 410
 411 static HRESULT set_format(MMDevice *dev)
 412 {
 413     HRESULT hr;
 414     IAudioClient *client;
 415     WAVEFORMATEX *fmt;
 416     PROPVARIANT pv = { VT_EMPTY };
 417
 418     hr = drvs.pGetAudioEndpoint(dev->key, &dev->IMMDevice_iface, dev->flow, &client);
 419     if(FAILED(hr))
 420         return hr;
 421
 422     hr = IAudioClient_GetMixFormat(client, &fmt);
 423     if(FAILED(hr)){
 424         IAudioClient_Release(client);
 425         return hr;
 426     }
 427
 428     IAudioClient_Release(client);
 429
 430     pv.vt = VT_BLOB;
 431     pv.u.blob.cbSize = sizeof(WAVEFORMATEX) + fmt->cbSize;
 432     pv.u.blob.pBlobData = (BYTE*)fmt;
 433     MMDevice_SetPropValue(&dev->devguid, dev->flow,
 434             &PKEY_AudioEngine_DeviceFormat, &pv);
 435     MMDevice_SetPropValue(&dev->devguid, dev->flow,
 436             &PKEY_AudioEngine_OEMFormat, &pv);
 437
 438     return S_OK;
 439 }
 440
 441 static HRESULT load_driver_devices(EDataFlow flow)
 442 {
 443     WCHAR **ids;
 444     void **keys;
 445     UINT num, def, i;
 446     HRESULT hr;
 447
 448     if(!drvs.pGetEndpointIDs)
 449         return S_OK;
 450
 451     hr = drvs.pGetEndpointIDs(flow, &ids, &keys, &num, &def);
 452     if(FAILED(hr))
 453         return hr;
 454
 455     for(i = 0; i < num; ++i){
 456         MMDevice *dev;
 457         dev = MMDevice_Create(ids[i], keys[i], NULL, flow, DEVICE_STATE_ACTIVE,
 458                 def == i);
 459         set_format(dev);
 460         HeapFree(GetProcessHeap(), 0, ids[i]);
 461     }
 462
 463     HeapFree(GetProcessHeap(), 0, keys);
 464     HeapFree(GetProcessHeap(), 0, ids);
 465
 466     return S_OK;
 467 }
 468
 469 static void MMDevice_Destroy(MMDevice *This)
 470 {
 471     DWORD i;
 472     TRACE("Freeing %s\n", debugstr_w(This->drv_id));
 473     /* Since this function is called at destruction time, reordering of the list is unimportant */
 474     for (i = 0; i < MMDevice_count; ++i)
 475     {
 476         if (MMDevice_head[i] == This)
 477         {
 478             MMDevice_head[i] = MMDevice_head[--MMDevice_count];
 479             break;
 480         }
 481     }
 482     This->crst.DebugInfo->Spare[0] = 0;
 483     DeleteCriticalSection(&This->crst);
 484     HeapFree(GetProcessHeap(), 0, This->drv_id);
 485     HeapFree(GetProcessHeap(), 0, This->key);
 486     HeapFree(GetProcessHeap(), 0, This);
 487 }
 488
 489 static inline MMDevice *impl_from_IMMDevice(IMMDevice *iface)
 490 {
 491     return CONTAINING_RECORD(iface, MMDevice, IMMDevice_iface);
 492 }
 493
 494 static HRESULT WINAPI MMDevice_QueryInterface(IMMDevice *iface, REFIID riid, void **ppv)
 495 {
 496     MMDevice *This = impl_from_IMMDevice(iface);
 497     TRACE("(%p)->(%s,%p)\n", iface, debugstr_guid(riid), ppv);
 498
 499     if (!ppv)
 500         return E_POINTER;
 501     *ppv = NULL;
 502     if (IsEqualIID(riid, &IID_IUnknown)
 503         || IsEqualIID(riid, &IID_IMMDevice))
 504         *ppv = This;
 505     else if (IsEqualIID(riid, &IID_IMMEndpoint))
 506         *ppv = &This->IMMEndpoint_iface;
 507     if (*ppv)
 508     {
 509         IUnknown_AddRef((IUnknown*)*ppv);
 510         return S_OK;
 511     }
 512     WARN("Unknown interface %s\n", debugstr_guid(riid));
 513     return E_NOINTERFACE;
 514 }
 515
 516 static ULONG WINAPI MMDevice_AddRef(IMMDevice *iface)
 517 {
 518     MMDevice *This = impl_from_IMMDevice(iface);
 519     LONG ref;
 520
 521     ref = InterlockedIncrement(&This->ref);
 522     TRACE("Refcount now %i\n", ref);
 523     return ref;
 524 }
 525
 526 static ULONG WINAPI MMDevice_Release(IMMDevice *iface)
 527 {
 528     MMDevice *This = impl_from_IMMDevice(iface);
 529     LONG ref;
 530
 531     ref = InterlockedDecrement(&This->ref);
 532     TRACE("Refcount now %i\n", ref);
 533     return ref;
 534 }
 535
 536 static HRESULT WINAPI MMDevice_Activate(IMMDevice *iface, REFIID riid, DWORD clsctx, PROPVARIANT *params, void **ppv)
 537 {
 538     HRESULT hr = E_NOINTERFACE;
 539     MMDevice *This = impl_from_IMMDevice(iface);
 540
 541     TRACE("(%p)->(%p,%x,%p,%p)\n", iface, riid, clsctx, params, ppv);
 542
 543     if (!ppv)
 544         return E_POINTER;
 545
 546     if (IsEqualIID(riid, &IID_IAudioClient)){
 547         hr = drvs.pGetAudioEndpoint(This->key, iface, This->flow, (IAudioClient**)ppv);
 548     }else if (IsEqualIID(riid, &IID_IAudioEndpointVolume))
 549         hr = AudioEndpointVolume_Create(This, (IAudioEndpointVolume**)ppv);
 550     else if (IsEqualIID(riid, &IID_IAudioSessionManager)
 551              || IsEqualIID(riid, &IID_IAudioSessionManager2))
 552     {
 553         hr = drvs.pGetAudioSessionManager(iface, (IAudioSessionManager2**)ppv);
 554     }
 555     else if (IsEqualIID(riid, &IID_IBaseFilter))
 556     {
 557         if (This->flow == eRender)
 558             hr = CoCreateInstance(&CLSID_DSoundRender, NULL, clsctx, riid, ppv);
 559         else
 560             ERR("Not supported for recording?\n");
 561         if (SUCCEEDED(hr))
 562         {
 563             IPersistPropertyBag *ppb;
 564             hr = IUnknown_QueryInterface((IUnknown*)*ppv, &IID_IPersistPropertyBag, (void*)&ppb);
 565             if (SUCCEEDED(hr))
 566             {
 567                 /* ::Load cannot assume the interface stays alive after the function returns,
 568                  * so just create the interface on the stack, saves a lot of complicated code */
 569                 IPropertyBagImpl bag = { { &PB_Vtbl }, This->devguid };
 570                 hr = IPersistPropertyBag_Load(ppb, &bag.IPropertyBag_iface, NULL);
 571                 IPersistPropertyBag_Release(ppb);
 572                 if (FAILED(hr))
 573                     IBaseFilter_Release((IBaseFilter*)*ppv);
 574             }
 575             else
 576             {
 577                 FIXME("Wine doesn't support IPersistPropertyBag on DSoundRender yet, ignoring..\n");
 578                 hr = S_OK;
 579             }
 580         }
 581     }
 582     else if (IsEqualIID(riid, &IID_IDeviceTopology))
 583     {
 584         FIXME("IID_IDeviceTopology unsupported\n");
 585     }
 586     else if (IsEqualIID(riid, &IID_IDirectSound)
 587              || IsEqualIID(riid, &IID_IDirectSound8))
 588     {
 589         if (This->flow == eRender)
 590             hr = CoCreateInstance(&CLSID_DirectSound8, NULL, clsctx, riid, ppv);
 591         if (SUCCEEDED(hr))
 592         {
 593             hr = IDirectSound_Initialize((IDirectSound*)*ppv, &This->devguid);
 594             if (FAILED(hr))
 595                 IDirectSound_Release((IDirectSound*)*ppv);
 596         }
 597     }
 598     else if (IsEqualIID(riid, &IID_IDirectSoundCapture)
 599              || IsEqualIID(riid, &IID_IDirectSoundCapture8))
 600     {
 601         if (This->flow == eCapture)
 602             hr = CoCreateInstance(&CLSID_DirectSoundCapture8, NULL, clsctx, riid, ppv);
 603         if (SUCCEEDED(hr))
 604         {
 605             hr = IDirectSoundCapture_Initialize((IDirectSoundCapture*)*ppv, &This->devguid);
 606             if (FAILED(hr))
 607                 IDirectSoundCapture_Release((IDirectSoundCapture*)*ppv);
 608         }
 609     }
 610     else
 611         ERR("Invalid/unknown iid %s\n", debugstr_guid(riid));
 612
 613     if (FAILED(hr))
 614         *ppv = NULL;
 615
 616     TRACE("Returning %08x\n", hr);
 617     return hr;
 618 }
 619
 620 static HRESULT WINAPI MMDevice_OpenPropertyStore(IMMDevice *iface, DWORD access, IPropertyStore **ppv)
 621 {
 622     MMDevice *This = impl_from_IMMDevice(iface);
 623     TRACE("(%p)->(%x,%p)\n", This, access, ppv);
 624
 625     if (!ppv)
 626         return E_POINTER;
 627     return MMDevPropStore_Create(This, access, ppv);
 628 }
 629
 630 static HRESULT WINAPI MMDevice_GetId(IMMDevice *iface, WCHAR **itemid)
 631 {
 632     MMDevice *This = impl_from_IMMDevice(iface);
 633     WCHAR *str;
 634     GUID *id = &This->devguid;
 635     static const WCHAR formatW[] = { '{','0','.','0','.','0','.','0','0','0','0','0','0','0','0','}','.',
 636                                      '{','%','0','8','X','-','%','0','4','X','-',
 637                                      '%','0','4','X','-','%','0','2','X','%','0','2','X','-',
 638                                      '%','0','2','X','%','0','2','X','%','0','2','X','%','0','2','X',
 639                                      '%','0','2','X','%','0','2','X','}',0 };
 640
 641     TRACE("(%p)->(%p)\n", This, itemid);
 642     if (!itemid)
 643         return E_POINTER;
 644     *itemid = str = CoTaskMemAlloc(56 * sizeof(WCHAR));
 645     if (!str)
 646         return E_OUTOFMEMORY;
 647     wsprintfW( str, formatW, id->Data1, id->Data2, id->Data3,
 648                id->Data4[0], id->Data4[1], id->Data4[2], id->Data4[3],
 649                id->Data4[4], id->Data4[5], id->Data4[6], id->Data4[7] );
 650     return S_OK;
 651 }
 652
 653 static HRESULT WINAPI MMDevice_GetState(IMMDevice *iface, DWORD *state)
 654 {
 655     MMDevice *This = impl_from_IMMDevice(iface);
 656     TRACE("(%p)->(%p)\n", iface, state);
 657
 658     if (!state)
 659         return E_POINTER;
 660     *state = This->state;
 661     return S_OK;
 662 }
 663
 664 static const IMMDeviceVtbl MMDeviceVtbl =
 665 {
 666     MMDevice_QueryInterface,
 667     MMDevice_AddRef,
 668     MMDevice_Release,
 669     MMDevice_Activate,
 670     MMDevice_OpenPropertyStore,
 671     MMDevice_GetId,
 672     MMDevice_GetState
 673 };
 674
 675 static inline MMDevice *impl_from_IMMEndpoint(IMMEndpoint *iface)
 676 {
 677     return CONTAINING_RECORD(iface, MMDevice, IMMEndpoint_iface);
 678 }
 679
 680 static HRESULT WINAPI MMEndpoint_QueryInterface(IMMEndpoint *iface, REFIID riid, void **ppv)
 681 {
 682     MMDevice *This = impl_from_IMMEndpoint(iface);
 683     return IMMDevice_QueryInterface(&This->IMMDevice_iface, riid, ppv);
 684 }
 685
 686 static ULONG WINAPI MMEndpoint_AddRef(IMMEndpoint *iface)
 687 {
 688     MMDevice *This = impl_from_IMMEndpoint(iface);
 689     return IMMDevice_AddRef(&This->IMMDevice_iface);
 690 }
 691
 692 static ULONG WINAPI MMEndpoint_Release(IMMEndpoint *iface)
 693 {
 694     MMDevice *This = impl_from_IMMEndpoint(iface);
 695     return IMMDevice_Release(&This->IMMDevice_iface);
 696 }
 697
 698 static HRESULT WINAPI MMEndpoint_GetDataFlow(IMMEndpoint *iface, EDataFlow *flow)
 699 {
 700     MMDevice *This = impl_from_IMMEndpoint(iface);
 701     if (!flow)
 702         return E_POINTER;
 703     *flow = This->flow;
 704     return S_OK;
 705 }
 706
 707 static const IMMEndpointVtbl MMEndpointVtbl =
 708 {
 709     MMEndpoint_QueryInterface,
 710     MMEndpoint_AddRef,
 711     MMEndpoint_Release,
 712     MMEndpoint_GetDataFlow
 713 };
 714
 715 static HRESULT MMDevCol_Create(IMMDeviceCollection **ppv, EDataFlow flow, DWORD state)
 716 {
 717     MMDevColImpl *This;
 718
 719     This = HeapAlloc(GetProcessHeap(), 0, sizeof(*This));
 720     *ppv = NULL;
 721     if (!This)
 722         return E_OUTOFMEMORY;
 723     This->IMMDeviceCollection_iface.lpVtbl = &MMDevColVtbl;
 724     This->ref = 1;
 725     This->flow = flow;
 726     This->state = state;
 727     *ppv = &This->IMMDeviceCollection_iface;
 728     return S_OK;
 729 }
 730
 731 static void MMDevCol_Destroy(MMDevColImpl *This)
 732 {
 733     HeapFree(GetProcessHeap(), 0, This);
 734 }
 735
 736 static HRESULT WINAPI MMDevCol_QueryInterface(IMMDeviceCollection *iface, REFIID riid, void **ppv)
 737 {
 738     MMDevColImpl *This = impl_from_IMMDeviceCollection(iface);
 739
 740     if (!ppv)
 741         return E_POINTER;
 742     if (IsEqualIID(riid, &IID_IUnknown)
 743         || IsEqualIID(riid, &IID_IMMDeviceCollection))
 744         *ppv = This;
 745     else
 746         *ppv = NULL;
 747     if (!*ppv)
 748         return E_NOINTERFACE;
 749     IUnknown_AddRef((IUnknown*)*ppv);
 750     return S_OK;
 751 }
 752
 753 static ULONG WINAPI MMDevCol_AddRef(IMMDeviceCollection *iface)
 754 {
 755     MMDevColImpl *This = impl_from_IMMDeviceCollection(iface);
 756     LONG ref = InterlockedIncrement(&This->ref);
 757     TRACE("Refcount now %i\n", ref);
 758     return ref;
 759 }
 760
 761 static ULONG WINAPI MMDevCol_Release(IMMDeviceCollection *iface)
 762 {
 763     MMDevColImpl *This = impl_from_IMMDeviceCollection(iface);
 764     LONG ref = InterlockedDecrement(&This->ref);
 765     TRACE("Refcount now %i\n", ref);
 766     if (!ref)
 767         MMDevCol_Destroy(This);
 768     return ref;
 769 }
 770
 771 static HRESULT WINAPI MMDevCol_GetCount(IMMDeviceCollection *iface, UINT *numdevs)
 772 {
 773     MMDevColImpl *This = impl_from_IMMDeviceCollection(iface);
 774     DWORD i;
 775
 776     TRACE("(%p)->(%p)\n", This, numdevs);
 777     if (!numdevs)
 778         return E_POINTER;
 779
 780     *numdevs = 0;
 781     for (i = 0; i < MMDevice_count; ++i)
 782     {
 783         MMDevice *cur = MMDevice_head[i];
 784         if ((cur->flow == This->flow || This->flow == eAll)
 785             && (cur->state & This->state))
 786             ++(*numdevs);
 787     }
 788     return S_OK;
 789 }
 790
 791 static HRESULT WINAPI MMDevCol_Item(IMMDeviceCollection *iface, UINT n, IMMDevice **dev)
 792 {
 793     MMDevColImpl *This = impl_from_IMMDeviceCollection(iface);
 794     DWORD i = 0, j = 0;
 795
 796     TRACE("(%p)->(%u, %p)\n", This, n, dev);
 797     if (!dev)
 798         return E_POINTER;
 799
 800     for (j = 0; j < MMDevice_count; ++j)
 801     {
 802         MMDevice *cur = MMDevice_head[j];
 803         if ((cur->flow == This->flow || This->flow == eAll)
 804             && (cur->state & This->state)
 805             && i++ == n)
 806         {
 807             *dev = &cur->IMMDevice_iface;
 808             IMMDevice_AddRef(*dev);
 809             return S_OK;
 810         }
 811     }
 812     WARN("Could not obtain item %u\n", n);
 813     *dev = NULL;
 814     return E_INVALIDARG;
 815 }
 816
 817 static const IMMDeviceCollectionVtbl MMDevColVtbl =
 818 {
 819     MMDevCol_QueryInterface,
 820     MMDevCol_AddRef,
 821     MMDevCol_Release,
 822     MMDevCol_GetCount,
 823     MMDevCol_Item
 824 };
 825
 826 HRESULT MMDevEnum_Create(REFIID riid, void **ppv)
 827 {
 828     MMDevEnumImpl *This = MMDevEnumerator;
 829
 830     if (!This)
 831     {
 832         This = HeapAlloc(GetProcessHeap(), 0, sizeof(*This));
 833         *ppv = NULL;
 834         if (!This)
 835             return E_OUTOFMEMORY;
 836         This->ref = 1;
 837         This->IMMDeviceEnumerator_iface.lpVtbl = &MMDevEnumVtbl;
 838         MMDevEnumerator = This;
 839
 840         load_devices_from_reg();
 841         load_driver_devices(eRender);
 842         load_driver_devices(eCapture);
 843     }
 844     return IUnknown_QueryInterface((IUnknown*)This, riid, ppv);
 845 }
 846
 847 void MMDevEnum_Free(void)
 848 {
 849     while (MMDevice_count)
 850         MMDevice_Destroy(MMDevice_head[0]);
 851     RegCloseKey(key_render);
 852     RegCloseKey(key_capture);
 853     key_render = key_capture = NULL;
 854     HeapFree(GetProcessHeap(), 0, MMDevEnumerator);
 855     MMDevEnumerator = NULL;
 856 }
 857
 858 static HRESULT WINAPI MMDevEnum_QueryInterface(IMMDeviceEnumerator *iface, REFIID riid, void **ppv)
 859 {
 860     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 861
 862     if (!ppv)
 863         return E_POINTER;
 864     if (IsEqualIID(riid, &IID_IUnknown)
 865         || IsEqualIID(riid, &IID_IMMDeviceEnumerator))
 866         *ppv = This;
 867     else
 868         *ppv = NULL;
 869     if (!*ppv)
 870         return E_NOINTERFACE;
 871     IUnknown_AddRef((IUnknown*)*ppv);
 872     return S_OK;
 873 }
 874
 875 static ULONG WINAPI MMDevEnum_AddRef(IMMDeviceEnumerator *iface)
 876 {
 877     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 878     LONG ref = InterlockedIncrement(&This->ref);
 879     TRACE("Refcount now %i\n", ref);
 880     return ref;
 881 }
 882
 883 static ULONG WINAPI MMDevEnum_Release(IMMDeviceEnumerator *iface)
 884 {
 885     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 886     LONG ref = InterlockedDecrement(&This->ref);
 887     if (!ref)
 888         MMDevEnum_Free();
 889     TRACE("Refcount now %i\n", ref);
 890     return ref;
 891 }
 892
 893 static HRESULT WINAPI MMDevEnum_EnumAudioEndpoints(IMMDeviceEnumerator *iface, EDataFlow flow, DWORD mask, IMMDeviceCollection **devices)
 894 {
 895     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 896     TRACE("(%p)->(%u,%u,%p)\n", This, flow, mask, devices);
 897     if (!devices)
 898         return E_POINTER;
 899     *devices = NULL;
 900     if (flow >= EDataFlow_enum_count)
 901         return E_INVALIDARG;
 902     if (mask & ~DEVICE_STATEMASK_ALL)
 903         return E_INVALIDARG;
 904     return MMDevCol_Create(devices, flow, mask);
 905 }
 906
 907 static HRESULT WINAPI MMDevEnum_GetDefaultAudioEndpoint(IMMDeviceEnumerator *iface, EDataFlow flow, ERole role, IMMDevice **device)
 908 {
 909     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 910     TRACE("(%p)->(%u,%u,%p)\n", This, flow, role, device);
 911
 912     if (!device)
 913         return E_POINTER;
 914     *device = NULL;
 915
 916     if (flow == eRender)
 917         *device = &MMDevice_def_play->IMMDevice_iface;
 918     else if (flow == eCapture)
 919         *device = &MMDevice_def_rec->IMMDevice_iface;
 920     else
 921     {
 922         WARN("Unknown flow %u\n", flow);
 923         return E_INVALIDARG;
 924     }
 925
 926     if (!*device)
 927         return E_NOTFOUND;
 928     IMMDevice_AddRef(*device);
 929     return S_OK;
 930 }
 931
 932 static HRESULT WINAPI MMDevEnum_GetDevice(IMMDeviceEnumerator *iface, const WCHAR *name, IMMDevice **device)
 933 {
 934     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 935     DWORD i=0;
 936     IMMDevice *dev = NULL;
 937
 938     if(!name || !device)
 939         return E_POINTER;
 940
 941     TRACE("(%p)->(%s,%p)\n", This, debugstr_w(name), device);
 942     for (i = 0; i < MMDevice_count; ++i)
 943     {
 944         WCHAR *str;
 945         dev = &MMDevice_head[i]->IMMDevice_iface;
 946         IMMDevice_GetId(dev, &str);
 947
 948         if (str && !lstrcmpW(str, name))
 949         {
 950             CoTaskMemFree(str);
 951             IUnknown_AddRef(dev);
 952             *device = dev;
 953             return S_OK;
 954         }
 955         CoTaskMemFree(str);
 956     }
 957     TRACE("Could not find device %s\n", debugstr_w(name));
 958     return E_INVALIDARG;
 959 }
 960
 961 static HRESULT WINAPI MMDevEnum_RegisterEndpointNotificationCallback(IMMDeviceEnumerator *iface, IMMNotificationClient *client)
 962 {
 963     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 964     TRACE("(%p)->(%p)\n", This, client);
 965     FIXME("stub\n");
 966     return S_OK;
 967 }
 968
 969 static HRESULT WINAPI MMDevEnum_UnregisterEndpointNotificationCallback(IMMDeviceEnumerator *iface, IMMNotificationClient *client)
 970 {
 971     MMDevEnumImpl *This = impl_from_IMMDeviceEnumerator(iface);
 972     TRACE("(%p)->(%p)\n", This, client);
 973     FIXME("stub\n");
 974     return S_OK;
 975 }
 976
 977 static const IMMDeviceEnumeratorVtbl MMDevEnumVtbl =
 978 {
 979     MMDevEnum_QueryInterface,
 980     MMDevEnum_AddRef,
 981     MMDevEnum_Release,
 982     MMDevEnum_EnumAudioEndpoints,
 983     MMDevEnum_GetDefaultAudioEndpoint,
 984     MMDevEnum_GetDevice,
 985     MMDevEnum_RegisterEndpointNotificationCallback,
 986     MMDevEnum_UnregisterEndpointNotificationCallback
 987 };
 988
 989 static HRESULT MMDevPropStore_Create(MMDevice *parent, DWORD access, IPropertyStore **ppv)
 990 {
 991     MMDevPropStore *This;
 992     if (access != STGM_READ
 993         && access != STGM_WRITE
 994         && access != STGM_READWRITE)
 995     {
 996         WARN("Invalid access %08x\n", access);
 997         return E_INVALIDARG;
 998     }
 999     This = HeapAlloc(GetProcessHeap(), 0, sizeof(*This));
1000     *ppv = &This->IPropertyStore_iface;
1001     if (!This)
1002         return E_OUTOFMEMORY;
1003     This->IPropertyStore_iface.lpVtbl = &MMDevPropVtbl;
1004     This->ref = 1;
1005     This->parent = parent;
1006     This->access = access;
1007     return S_OK;
1008 }
1009
1010 static void MMDevPropStore_Destroy(MMDevPropStore *This)
1011 {
1012     HeapFree(GetProcessHeap(), 0, This);
1013 }
1014
1015 static HRESULT WINAPI MMDevPropStore_QueryInterface(IPropertyStore *iface, REFIID riid, void **ppv)
1016 {
1017     MMDevPropStore *This = impl_from_IPropertyStore(iface);
1018
1019     if (!ppv)
1020         return E_POINTER;
1021     if (IsEqualIID(riid, &IID_IUnknown)
1022         || IsEqualIID(riid, &IID_IPropertyStore))
1023         *ppv = This;
1024     else
1025         *ppv = NULL;
1026     if (!*ppv)
1027         return E_NOINTERFACE;
1028     IUnknown_AddRef((IUnknown*)*ppv);
1029     return S_OK;
1030 }
1031
1032 static ULONG WINAPI MMDevPropStore_AddRef(IPropertyStore *iface)
1033 {
1034     MMDevPropStore *This = impl_from_IPropertyStore(iface);
1035     LONG ref = InterlockedIncrement(&This->ref);
1036     TRACE("Refcount now %i\n", ref);
1037     return ref;
1038 }
1039
1040 static ULONG WINAPI MMDevPropStore_Release(IPropertyStore *iface)
1041 {
1042     MMDevPropStore *This = impl_from_IPropertyStore(iface);
1043     LONG ref = InterlockedDecrement(&This->ref);
1044     TRACE("Refcount now %i\n", ref);
1045     if (!ref)
1046         MMDevPropStore_Destroy(This);
1047     return ref;
1048 }
1049
1050 static HRESULT WINAPI MMDevPropStore_GetCount(IPropertyStore *iface, DWORD *nprops)
1051 {
1052     MMDevPropStore *This = impl_from_IPropertyStore(iface);
1053     WCHAR buffer[50];
1054     DWORD i = 0;
1055     HKEY propkey;
1056     HRESULT hr;
1057
1058     TRACE("(%p)->(%p)\n", iface, nprops);
1059     if (!nprops)
1060         return E_POINTER;
1061     hr = MMDevPropStore_OpenPropKey(&This->parent->devguid, This->parent->flow, &propkey);
1062     if (FAILED(hr))
1063         return hr;
1064     *nprops = 0;
1065     do {
1066         DWORD len = sizeof(buffer)/sizeof(*buffer);
1067         if (RegEnumKeyExW(propkey, i, buffer, &len, NULL, NULL, NULL, NULL) != ERROR_SUCCESS)
1068             break;
1069         i++;
1070     } while (0);
1071     RegCloseKey(propkey);
1072     TRACE("Returning %i\n", i);
1073     *nprops = i;
1074     return S_OK;
1075 }
1076
1077 static HRESULT WINAPI MMDevPropStore_GetAt(IPropertyStore *iface, DWORD prop, PROPERTYKEY *key)
1078 {
1079     MMDevPropStore *This = impl_from_IPropertyStore(iface);
1080     WCHAR buffer[50];
1081     DWORD len = sizeof(buffer)/sizeof(*buffer);
1082     HRESULT hr;
1083     HKEY propkey;
1084
1085     TRACE("(%p)->(%u,%p)\n", iface, prop, key);
1086     if (!key)
1087         return E_POINTER;
1088
1089     hr = MMDevPropStore_OpenPropKey(&This->parent->devguid, This->parent->flow, &propkey);
1090     if (FAILED(hr))
1091         return hr;
1092
1093     if (RegEnumKeyExW(propkey, prop, buffer, &len, NULL, NULL, NULL, NULL) != ERROR_SUCCESS
1094         || len <= 40)
1095     {
1096         WARN("GetAt %u failed\n", prop);
1097         return E_INVALIDARG;
1098     }
1099     RegCloseKey(propkey);
1100     buffer[39] = 0;
1101     CLSIDFromString(buffer, &key->fmtid);
1102     key->pid = atoiW(&buffer[40]);
1103     return S_OK;
1104 }
1105
1106 static HRESULT WINAPI MMDevPropStore_GetValue(IPropertyStore *iface, REFPROPERTYKEY key, PROPVARIANT *pv)
1107 {
1108     MMDevPropStore *This = impl_from_IPropertyStore(iface);
1109     TRACE("(%p)->(\"%s,%u\", %p\n", This, debugstr_guid(&key->fmtid), key ? key->pid : 0, pv);
1110
1111     if (!key || !pv)
1112         return E_POINTER;
1113     if (This->access != STGM_READ
1114         && This->access != STGM_READWRITE)
1115         return STG_E_ACCESSDENIED;
1116
1117     /* Special case */
1118     if (IsEqualPropertyKey(*key, PKEY_AudioEndpoint_GUID))
1119     {
1120         pv->vt = VT_LPWSTR;
1121         pv->u.pwszVal = CoTaskMemAlloc(39 * sizeof(WCHAR));
1122         if (!pv->u.pwszVal)
1123             return E_OUTOFMEMORY;
1124         StringFromGUID2(&This->parent->devguid, pv->u.pwszVal, 39);
1125         return S_OK;
1126     }
1127
1128     return MMDevice_GetPropValue(&This->parent->devguid, This->parent->flow, key, pv);
1129 }
1130
1131 static HRESULT WINAPI MMDevPropStore_SetValue(IPropertyStore *iface, REFPROPERTYKEY key, REFPROPVARIANT pv)
1132 {
1133     MMDevPropStore *This = impl_from_IPropertyStore(iface);
1134
1135     if (!key || !pv)
1136         return E_POINTER;
1137
1138     if (This->access != STGM_WRITE
1139         && This->access != STGM_READWRITE)
1140         return STG_E_ACCESSDENIED;
1141     return MMDevice_SetPropValue(&This->parent->devguid, This->parent->flow, key, pv);
1142 }
1143
1144 static HRESULT WINAPI MMDevPropStore_Commit(IPropertyStore *iface)
1145 {
1146     FIXME("stub\n");
1147     return E_NOTIMPL;
1148 }
1149
1150 static const IPropertyStoreVtbl MMDevPropVtbl =
1151 {
1152     MMDevPropStore_QueryInterface,
1153     MMDevPropStore_AddRef,
1154     MMDevPropStore_Release,
1155     MMDevPropStore_GetCount,
1156     MMDevPropStore_GetAt,
1157     MMDevPropStore_GetValue,
1158     MMDevPropStore_SetValue,
1159     MMDevPropStore_Commit
1160 };
1161
1162
1163 /* Property bag for IBaseFilter activation */
1164 static HRESULT WINAPI PB_QueryInterface(IPropertyBag *iface, REFIID riid, void **ppv)
1165 {
1166     ERR("Should not be called\n");
1167     *ppv = NULL;
1168     return E_NOINTERFACE;
1169 }
1170
1171 static ULONG WINAPI PB_AddRef(IPropertyBag *iface)
1172 {
1173     ERR("Should not be called\n");
1174     return 2;
1175 }
1176
1177 static ULONG WINAPI PB_Release(IPropertyBag *iface)
1178 {
1179     ERR("Should not be called\n");
1180     return 1;
1181 }
1182
1183 static HRESULT WINAPI PB_Read(IPropertyBag *iface, LPCOLESTR name, VARIANT *var, IErrorLog *log)
1184 {
1185     static const WCHAR dsguid[] = { 'D','S','G','u','i','d', 0 };
1186     IPropertyBagImpl *This = impl_from_IPropertyBag(iface);
1187     TRACE("Trying to read %s, type %u\n", debugstr_w(name), var->n1.n2.vt);
1188     if (!lstrcmpW(name, dsguid))
1189     {
1190         WCHAR guidstr[39];
1191         StringFromGUID2(&This->devguid, guidstr,sizeof(guidstr)/sizeof(*guidstr));
1192         var->n1.n2.vt = VT_BSTR;
1193         var->n1.n2.n3.bstrVal = SysAllocString(guidstr);
1194         return S_OK;
1195     }
1196     ERR("Unknown property '%s' queried\n", debugstr_w(name));
1197     return E_FAIL;
1198 }
1199
1200 static HRESULT WINAPI PB_Write(IPropertyBag *iface, LPCOLESTR name, VARIANT *var)
1201 {
1202     ERR("Should not be called\n");
1203     return E_FAIL;
1204 }
1205
1206 static const IPropertyBagVtbl PB_Vtbl =
1207 {
1208     PB_QueryInterface,
1209     PB_AddRef,
1210     PB_Release,
1211     PB_Read,
1212     PB_Write
1213 };