WPF Message

以下是在WPF中接收系统消息的方法，类似于c#里的WndProc函数

        private HwndSource m_source;
        public const int WM_DEVICECHANGE = 0x0219;

         private void OnLoaded(Object sender,EventArgs e)
        {
            IntPtr hwnd = new WindowInteropHelper(this).Handle;
            if (hwnd != null && hwnd != IntPtr.Zero)
            {
                m_source = HwndSource.FromHwnd(hwnd);
                m_source.AddHook(new HwndSourceHook(MessageHookHandler));
            }
        }

        public IntPtr MessageHookHandler(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == WM_DEVICECHANGE)
            {
              //do what you want

                handled = true;
            }
            return IntPtr.Zero;
        }