/// <summary>
/// Unprepares/prepares and adds a MIDIHDR header back to the buffer to
/// record another system exclusive message.
/// </summary>
private void ManageSysExHeaders()
{
lock(lockObject)
{
while(IsRecording())
{
Monitor.Wait(lockObject);
while(sysExHeaderQueue.Count > 0 && IsRecording())
{
IntPtr header = (IntPtr)sysExHeaderQueue.Dequeue();
// Unprepare header.
int result = midiInUnprepareHeader(handle, header,
Marshal.SizeOf(typeof(MidiHeader)));
if(result == MMSYSERR_NOERROR)
{
// Prepare header to be used again.
result = midiInPrepareHeader(handle, header,
Marshal.SizeOf(typeof(MidiHeader)));
}
if(result == MMSYSERR_NOERROR)
{
// Add header back to buffer.
result = midiInAddBuffer(handle, header,
Marshal.SizeOf(typeof(MidiHeader)));
}
if(result != MMSYSERR_NOERROR)
{
// Raise event letting clients know an error has occurred.
if(SysExHeaderErrorOccurred != null)
{
InputDeviceException ex = new InputDeviceException(result);
SysExHeaderErrorOccurred(this,
new SysExHeaderErrorEventArgs(ex.Message));
}
}
}
}
}
}