MOM_POSITIONCB

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.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mmsystem.h.

See Also

Musical Instrument Digital Interface (MIDI) Overview, MIDI Messages, MIDIHDR