how to get IDirectNotify

[laia]

i am working with a directsound program. i need IDirectNotify to place some notification when playing sound. but i found that i can't get it through the function-QueryInterface. it always fails. please help me. thanks laia.

[Alexander M]

HRESULT SetStopNotification(HANDLE hMyEvent,
LPDIRECTSOUNDBUFFER8 lpDsbSecondary)
{
LPDIRECTSOUNDNOTIFY8 lpDsNotify;
DSBPOSITIONNOTIFY PositionNotify;
HRESULT hr;

if (SUCCEEDED(
hr = lpDsbSecondary->QueryInterface(IID_IDirectSoundNotify8,
(LPVOID*)&lpDsNotify)))
{
PositionNotify.dwOffset = DSBPN_OFFSETSTOP;
PositionNotify.hEventNotify = hMyEvent;
hr = lpDsNotify->SetNotificationPositions(1, &PositionNotify);
lpDsNotify->Release();
}
return hr;
}

Don't try it, just do it! ;-)

[laia]

I just use these codes to get it, but the QueryInterface always failed. Then I try to get the interface to the CaptureBuffer, it is ok. Why these happened? laia