directsound can not be initized

[mwolf122]

Hello, i am writing a 3d program using DirectX. Now i want to play a piece of sound with DirectSound, but the initilization was not accomplished. the code i have written below, .... CoInitialize(NULL); if (FAILED( hResult = CoCreateInstance( CLSID_DirectMusicLoader , NULL, CLSCTX_INPROC, IID_IDirectMusicLoader8, (void**) &pLoader))) { return SOUNDERROR_MUSICLOADER; } if (FAILED( hResult = CoCreateInstance( CLSID_DirectMusicPerformance, NULL, CLSCTX_INPROC, IID_IDirectMusicLoader8, (void**) &pPerformance))) { return SOUNDERROR_MUSICPERFORMANCE; } .... the initial of DirectMusicLoader succeed, but wenn DirectMusicPerformance is initilized, it returned failure. Does anyone knows how can i solve the problem? thx anyway. mwolf122