The MM_MOM_POSITIONCB message is sent to a window when an MEVT_F_CALLBACK
event is reached in the MIDI output stream.
wParam = (WPARAM) lpMidiHdr
lParam = reserved
Address of a MIDIHDR
structure that identifies the event that caused the callback. The dwOffset
member gives the offset of the event.
Reserved; do not use.
This message does not return a value.
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
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.
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