Tsukikage.WinMM.MidiIO.MidiBuffer.FromMidiHeader C# (CSharp) Method

        public static MidiBuffer FromMidiHeader(Win32.MidiHeader header)
        {
            return (MidiBuffer)GCHandle.FromIntPtr(header.dwUser).Target;
        }

        /// <summary>
        /// Open MidiIn.
        /// MidiInを開きます。
        /// </summary>
        /// <param name="deviceId">index of GetDeviceNames(). GetDeviceNames()のindex</param>
        public MidiIn(int deviceId)
        {
            messageProc = new MessageThread(false, ThreadPriority.Normal, "MidiInProcThread");
            messageProc.MessageHandlers[Win32.MM_MIM_LONGDATA] = delegate(Message m)
            {
                Win32.MidiHeader header = Win32.MidiHeader.FromIntPtr(m.LParam);
                MidiBuffer       buf    = MidiBuffer.FromMidiHeader(header);
                int bytesRecorded       = (int)header.dwBytesRecorded;
                if (OnLongMsg != null && bytesRecorded != 0)
                {
                    byte[] data = buf.Data;
                    if (bytesRecorded != buf.Data.Length)
                    {
                        data = new byte[bytesRecorded];
                        Array.Copy(buf.Data, data, bytesRecorded);
                    }
                    System.Diagnostics.Trace.WriteLine("Recieved message from DEVICE: " + BitConverter.ToString(data));

                    try
                    {
                        OnLongMsg(data);
                    }
                    catch { }
                }

                if (recording)
                {
                    Win32.midiInAddBuffer(deviceHandle, m.LParam, Win32.MidiHeader.SizeOfMidiHeader);
                }
                else
                {
                    Win32.midiInUnprepareHeader(deviceHandle, m.LParam, Win32.MidiHeader.SizeOfMidiHeader);
                    buf.Dispose();
                    Interlocked.Decrement(ref enqueuedBufferCount);
                }
            };

            messageProc.MessageHandlers[Win32.MM_MIM_DATA] = delegate(Message m)
            {
                if (OnShortMsg != null)
                {
                    OnShortMsg((uint)m.LParam);
                }
            };

            int mmret = Win32.midiInOpen(out deviceHandle, (uint)deviceId, new IntPtr(messageProc.Win32ThreadID), IntPtr.Zero, Win32.CALLBACK_THREAD);

            if (mmret != Win32.MMSYSERR_NOERROR)
            {
                messageProc.Dispose();
                throw new IOException("デバイスが開けませんでした。(" + mmret + ")");
            }
        }