The DSBPOSITIONNOTIFY structure is used by the IDirectSoundNotify::SetNotificationPositions method.
typedef struct {
DWORD dwOffset;
HANDLE hEventNotify;
} DSBPOSITIONNOTIFY, *LPDSBPOSITIONNOTIFY;
typedef const DSBPOSITIONNOTIFY *LPCDSBPOSITIONNOTIFY;
The DSBPN_OFFSETSTOP value in the dwOffset member causes the event to be signaled when playback or capture stops, either because the end of the buffer has been reached (and playback or capture is not looping) or because the application called the IDirectSoundBuffer::Stop or IDirectSoundCaptureBuffer::Stop method.