请教Direct Music的问题 [复制链接]

请教Direct Music的问题 bool Init(HWND hWnd) { char pathStr[MAX_PATH]; // path for audio file WCHAR wcharStr[MAX_PATH]; // create the loader object if (FAILED(CoCreateInstance(CLSID_DirectMusicLoader, NULL, CLSCTX_INPROC,    IID_IDirectMusicLoader8, (void**)&dmusicLoader))) { MessageBox(hwnd, "Unable to create the IDirectMusicLoader8 object!\nPress OK to exit", "ERROR!", MB_OK); return false; } // create the performance object if (FAILED(CoCreateInstance(CLSID_DirectMusicPerformance, NULL, CLSCTX_INPROC,    IID_IDirectMusicPerformance8, (void**)&dmusicPerformance))) { MessageBox(hwnd, "Unable to create the IDirectMusicPerformance8 object!\nPress OK to exit", "ERROR!", MB_OK); return false; } // initialize the performance with the standard audio path dmusicPerformance->InitAudio(NULL, NULL, hwnd, DMUS_APATH_SHARED_STEREOPLUSREVERB, 64,     DMUS_AUDIOF_ALL, NULL);      // create a standard 3D audiopath      if (FAILED(dmusicPerformance->CreateStandardAudioPath(DMUS_APATH_DYNAMIC_3D,                                                            64, TRUE, &dmusic3DAudioPath)))      {           MessageBox(hwnd, "Unable to create standard 3D audiopath! Press OK to exit",                      "ERROR!", MB_OK);           return false;      }      // retrieve the listener from the audiopath      if (FAILED(dmusic3DAudioPath->GetObjectInPath(0, DMUS_PATH_PRIMARY_BUFFER, 0, GUID_NULL, 0,                                                   IID_IDirectSound3DListener8,                                                   (void**)&ds3DListener)))      {           MessageBox(hwnd, "Unable to retrieve the listener! Press OK to exit",                      "ERROR!", MB_OK);           return false;      }      // get the listener parameters      dsListenerParams.dwSize = sizeof(DS3DLISTENER);      ds3DListener->GetAllParameters(&dsListenerParams);      // set position of listener      dsListenerParams.vPosition.x = 0.0f;      dsListenerParams.vPosition.y = 0.0f;      dsListenerParams.vPosition.z = 0.0f;      ds3DListener->SetAllParameters(&dsListenerParams, DS3D_IMMEDIATE); // retrieve the current directory GetCurrentDirectory(MAX_PATH, pathStr); // convert to unicode string MultiByteToWideChar(CP_ACP, 0, pathStr, -1, wcharStr, MAX_PATH); // set the search directory dmusicLoader->SetSearchDirectory(GUID_DirectMusicAllTypes, wcharStr, FALSE); return true; } 请教一下，为什么我用下面这个函数初始化DirectX会出现错误： // create the loader object if (FAILED(CoCreateInstance(CLSID_DirectMusicLoader, NULL, CLSCTX_INPROC,    IID_IDirectMusicLoader8, (void**)&dmusicLoader))) { MessageBox(hwnd, "Unable to create the IDirectMusicLoader8 object!\nPress OK to exit", "ERROR!", MB_OK); return false; }