private void UnprepareHeader(bool input, IntPtr handle, IntPtr headerPtr)
{
if (headerPtr == IntPtr.Zero)
{
return;
}
MIDIHDR midihdr = null;
try
{
midihdr = (MIDIHDR)Marshal.PtrToStructure(headerPtr, typeof(MIDIHDR));
}
catch
{
}
if (midihdr != null)
{
try
{
if (input)
{
Midi.MIDI_InUnprepareHeader(handle, headerPtr);
}
else
{
Midi.MIDI_OutUnprepareHeader(handle, headerPtr);
}
}
catch
{
}
try
{
if (midihdr.data != IntPtr.Zero)
{
Marshal.FreeHGlobal(midihdr.data);
}
}
catch
{
}
try
{
Marshal.FreeHGlobal(headerPtr);
}
catch
{
}
}
}