MidiInProc callback function

The MidiInProc function is the callback function for handling incoming MIDI messages. MidiInProc is a placeholder for the application-supplied function name. The address of this function can be specified in the callback-address parameter of the midiInOpen function.

Syntax

void CALLBACK MidiInProc(
   HMIDIIN   hMidiIn,
   UINT      wMsg,
   DWORD_PTR dwInstance,
   DWORD_PTR dwParam1,
   DWORD_PTR dwParam2
);

Parameters

• hMidiIn
  Handle to the MIDI input device.

• wMsg
  MIDI input message.

• dwInstance
  Instance data supplied with the midiInOpen function.

• dwParam1
  Message parameter.

• dwParam2
  Message parameter.

Return value

This function does not return a value.

Remarks

The meaning of the dwParam1 and dwParam2 parameters is specific to the message type. For more information, see the topics for messages, such as MIM_DATA.

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