public void MidiOutCallback(MIDI_WIN32_MSDN.HMIDIOUT hMidiOut, MIDI_WIN32_MSDN wMsg, UIntPtr dwInstance, UIntPtr dwParam1, UIntPtr dwParam2)
{
if (wMsg.ToString() == "MOM_OPEN")
{
MIDI_WIN32_MSDN.midiOutPrepareHeader(hMidiOut, IntPtr.Zero, 65536);
}
else if (wMsg.ToString() == "MOM_DONE")
{
// do buffering (void code)
}
else if (wMsg.ToString() == "MOM_CLOSE")
{
MIDI_WIN32_MSDN.midiOutUnprepareHeader(hMidiOut, IntPtr.Zero, 65536);
}
}
//Use one of the following techniques to pass instance data from an application to a callback function:
//Use the dwCallbackInstance parameter of the function that opens the device driver.
//Use the dwUser member of the MIDIHDR structure that identifies a data block being sent to a MIDI device driver.
public static void callback(MIDI_WIN32_MSDN.HMIDIIN hMidiIn, MIDI_WIN32_MSDN wMsg, UIntPtr dwInstance, UIntPtr dwParam1, UIntPtr dwParam2)
{
if (wMsg.ToString() == "MIM_OPEN")
{
}
else if (wMsg.ToString() == "MIM_DATA")
{
byte[] data = new byte[4];
int highword = unchecked ((short)(long)dwParam1);
int lowword = unchecked ((short)((long)dwParam1 >> 16));
// unchecked : 오버플로 검사 안함
data[0] = 0x90;
data[1] = (byte)(highword >> 8);
data[2] = (byte)(lowword & 0xff);
uint msg = BitConverter.ToUInt32(data, 0);
res = MIDI_WIN32_MSDN.midiOutShortMsg(ohandle, (int)msg);
UIntPtr timestamp = dwParam2;
//Console.WriteLine(String.Format("{0} :\n\tNote Index: {1}\n\tNote Velocity: {2}\n\tTimestamp: {3}", wMsg, data[1], data[2], timestamp));
}
return;
}