WPF重写窗口过程函数

        protected override void OnSourceInitialized(EventArgs e)        {            win_SourceInitialized(this, e);            base.OnSourceInitialized(e);        }        void win_SourceInitialized(object sender, EventArgs e)        {            //方法1            HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);            if (source != null) source.AddHook(WndProc);            //方法2            //HwndSource source = PresentationSource.FromVisual(this) as HwndSource;            //if (source != null) source.AddHook(WndProc);          }        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)        {            // Handle messages...              if (msg == 0x219)//WM_DEVICECHANGE            {                GetCameraLoactionInfo();                InitCameraInfo();            }            return IntPtr.Zero;        }