MidiOutProc

  • Article

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.

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 Values

This function does not return a value.

Remarks

Applications should not call any system-defined functions from inside a callback function, except for EnterCriticalSection, LeaveCriticalSection, midiOutLongMsg, midiOutShortMsg, OutputDebugString, PostMessage, PostThreadMessage, SetEvent, timeGetSystemTime, timeGetTime, timeKillEvent, and timeSetEvent. Calling other wave functions will cause deadlock.

Requirements

**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Mmsystem.h; include Windows.h.

See Also

Musical Instrument Digital Interface (MIDI), MIDI Functions, EnterCriticalSection, LeaveCriticalSection, midiOutLongMsg, midiOutOpen, midiOutShortMsg, OutputDebugString, PostMessage, PostThreadMessage, SetEvent, timeGetSystemTime, timeGetTime, timeKillEvent, timeSetEvent,