// Close the port
public string Close()
{
EMMError result = NativeMethods.midiOutClose(handle);
handle = IntPtr.Zero;
return(WindowsUtil.StrError(result));
}
// Start the port and setup buffers to receives Sysex
public string Start()
{
// Allocate buffer array
if (buffers == null)
{
const int numBuffers = 4;
const int bufferSize = 4096; // ZZZ Param?
buffers = new MidiBuffer[numBuffers];
// Allocate and prepare the buffers
for (int b = 0; b < buffers.Length; b++)
{
// Create buffer
buffers[b] = new MidiBuffer(bufferSize, (IntPtr)b);
// Prepare the buffer and give it to windows
EMMError st = buffers[b].AddMidiInBuffer(handle);
if (st != EMMError.NOERROR)
{
return(WindowsUtil.StrError(st));
}
}
}
// Finally, start the port
return(WindowsUtil.StrError(NativeMethods.midiInStart(handle)));
}
public static string StrError(EMMError error)
{
if (error == EMMError.NOERROR)
{
return(null);
}
else
{
return(error.ToString());
}
}
// Close the port
public string Close()
{
Stop();
Reset();
EMMError result = NativeMethods.midiInClose(handle);
handle = IntPtr.Zero;
MidiInputReceived = null;
return(WindowsUtil.StrError(result));
}
// Reset the port and free the sysex buffers
public string Reset()
{
EMMError st = NativeMethods.midiInReset(handle);
if (st == EMMError.NOERROR && buffers != null)
{
// The buffers have now been released by the callback. Just free the array.
buffers = null;
}
return(WindowsUtil.StrError(st));
}
// Open the input port. Midi events cause the MidiInputReceived event to be raised
public string Open()
{
// Open the port
EMMError st = NativeMethods.midiInOpen(
out handle,
id,
midiInProc,
IntPtr.Zero,
NativeMethods.CALLBACK_FUNCTION);
return(WindowsUtil.StrError(st));
}
// Remove this buffer from a midi in port
public EMMError RemoveMidiInBuffer(IntPtr handle)
{
EMMError st = EMMError.DELETEERROR;
if (preparedForMidiIn)
{
st = NativeMethods.midiInUnprepareHeader(handle, header, (uint)Marshal.SizeOf(typeof(NativeMethods.MIDIHDR)));
if (st == EMMError.NOERROR)
{
preparedForMidiIn = false;
}
}
return(st);
}
public EMMError UnprepareForMidiOut(IntPtr handle)
{
EMMError st = EMMError.DELETEERROR;
// Un-prepare the buffer
if (preparedForMidiOut)
{
st = NativeMethods.midiOutUnprepareHeader(handle, header, (uint)Marshal.SizeOf(typeof(NativeMethods.MIDIHDR)));
if (st == EMMError.NOERROR)
{
preparedForMidiOut = false;
}
}
return(st);
}
// Add this buffer to a midi in port
public EMMError AddMidiInBuffer(IntPtr handle)
{
// Prepare the buffer
EMMError st = NativeMethods.midiInPrepareHeader(handle, header, headerSize);
if (st != EMMError.NOERROR)
{
return(st);
}
preparedForMidiIn = true;
// Give it to windows
st = NativeMethods.midiInAddBuffer(handle, header, headerSize);
if (st != EMMError.NOERROR)
{
return(st);
}
return(EMMError.NOERROR);
}
