public static MIDIError MIDI_InOpen(ref IntPtr handle, int deviceID, MIDIINPROC proc, IntPtr user, MIDIFlags flags)
{
if (proc == null)
{
flags = MIDIFlags.MIDI_CALLBACK_NULL;
}
else
{
flags |= MIDIFlags.MIDI_CALLBACK_FUNCTION;
}
return(Midi.midiInOpen(ref handle, new IntPtr(deviceID), proc, user, flags));
}