MM_MOM_POSITIONCB

	Overview

	Group

	Quick Info

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

MM_MOM_POSITIONCB

wParam = (WPARAM) lpMidiHdr

lParam = reserved

Parameters
lpMidiHdr

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

lParam

Reserved; do not use.

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.