MM_MOM_POSITIONCB
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.
See Also