private bool PrepareHeader(bool input, IntPtr handle, IntPtr headerPtr)
{
MIDIError midierror = MIDIError.MIDI_OK;
if (headerPtr != IntPtr.Zero)
{
if (input)
{
midierror = Midi.MIDI_InPrepareHeader(handle, headerPtr);
}
else
{
midierror = Midi.MIDI_OutPrepareHeader(handle, headerPtr);
}
}
if (midierror != MIDIError.MIDI_OK)
{
MIDIHDR midihdr = null;
try
{
midihdr = (MIDIHDR)Marshal.PtrToStructure(headerPtr, typeof(MIDIHDR));
}
catch
{
}
if (midihdr != null)
{
try
{
if (midihdr.data != IntPtr.Zero)
{
Marshal.FreeHGlobal(midihdr.data);
}
}
catch
{
}
midihdr.data = IntPtr.Zero;
try
{
if (headerPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(headerPtr);
}
}
catch
{
}
}
}
return(midierror == MIDIError.MIDI_OK);
}