Esempio n. 1
0
        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);
        }