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.
See Also