MOM_POSITIONCB

	Overview

	Group

	Quick Info

The MOM_POSITION message is sent to a window when a MEVT_F_CALLBACK event is reached in the MIDI output stream.

MOM_POSITIONCB

dwParam1 = (DWORD) hOutput

dwParam2 = (DWORD) lpMidiHdr

Parameters
hOutput

Handle of the MIDI output device.

lpMidiHdr

Address of a MIDIHDR structure that identifies the event that caused the callback function. The dwOffset member gives the offset of the event.

Return Values
This message does not return a value.

Remarks
Playback of the stream buffer continues even while the callback function is executing. Any events after the MEVT_F_CALLBACK event in the buffer will be scheduled and sent on time regardless of how much time is spent in the callback function.

If position callbacks are being generated more quickly than your application can process them, the dwOffset member of the MIDIHDR structure might refer to an event your application has not yet processed.