MidiOutProc callback function

The MidiOutProc function is the callback function for handling outgoing MIDI messages. MidiOutProc is a placeholder for the application-supplied function name. The address of the function can be specified in the callback-address parameter of the midiOutOpen function.

Syntax

void CALLBACK MidiOutProc(
   HMIDIOUT  hmo,
   UINT      wMsg,
   DWORD_PTR dwInstance,
   DWORD_PTR dwParam1,
   DWORD_PTR dwParam2
);

Parameters

• hmo
  Handle to the MIDI device associated with the callback function.

• wMsg
  MIDI output message.

• dwInstance
  Instance data supplied by using the midiOutOpen function.

• dwParam1
  Message parameter.

• dwParam2
  Message parameter.

Return value

This function does not return a value.

Remarks

Applications should not call any multimedia functions from inside the callback function, as doing so can cause a deadlock. Other system functions can safely be called from the callback.

Requirements

See also

MIDI Functions