protected override void WndProc()

in ScpPair/ScpForm.cs [78:133]
45 lines of code
10 McCabe index (conditional complexity)

        protected override void WndProc(ref Message m)
        {
            try
            {
                if (m.Msg == ScpDevice.WM_DEVICECHANGE)
                {
                    string Path;
                    ScpDevice.DEV_BROADCAST_HDR hdr;
                    var Type = m.WParam.ToInt32();

                    hdr =
                        (ScpDevice.DEV_BROADCAST_HDR)
                            Marshal.PtrToStructure(m.LParam, typeof (ScpDevice.DEV_BROADCAST_HDR));

                    if (hdr.dbch_devicetype == ScpDevice.DBT_DEVTYP_DEVICEINTERFACE)
                    {
                        ScpDevice.DEV_BROADCAST_DEVICEINTERFACE_M deviceInterface;

                        deviceInterface =
                            (ScpDevice.DEV_BROADCAST_DEVICEINTERFACE_M)
                                Marshal.PtrToStructure(m.LParam, typeof (ScpDevice.DEV_BROADCAST_DEVICEINTERFACE_M));

                        Path = new string(deviceInterface.dbcc_name);
                        Path = Path.Substring(0, Path.IndexOf('\0')).ToUpper();

                        switch (Type)
                        {
                            case ScpDevice.DBT_DEVICEARRIVAL:

                                if (usbDevice.State != DsState.Connected)
                                {
                                    usbDevice.Close();
                                    usbDevice = new UsbDs3();

                                    if (usbDevice.Open(Path)) usbDevice.Start();
                                }
                                break;

                            case ScpDevice.DBT_DEVICEREMOVECOMPLETE:

                                if (Path == usbDevice.Path && usbDevice.State == DsState.Connected)
                                {
                                    usbDevice.Close();
                                }

                                break;
                        }
                    }
                }
            }
            catch
            {
            }

            base.WndProc(ref m);
        }