C#（WPF）接收系统消息获取系统状态

代码如下：

    public partial class MainWindow
    {
        public MainWindow()
        {
            InitializeComponent();
        }

		protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);
            HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
            source.AddHook(WndProc);
        }

        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            switch (msg)
            {
                //锁屏事件 或许可以通过switch desktop来获取ctrl+alt+delete等状态
                case 0x2B1: // 
                    if (wParam != null)
                    {
                        switch (wParam.ToInt32())
                        {
                            case 0x7 :   //  锁屏
                                //RegistryStorage.ScreenLock = true;
                                break;
                            case 0x8:   //   解锁
                                //callMethod();
                                break;
                        }
                    }
                 break;   
              }
              return Intptr.zero;
        }
   }

此方式有一个缺陷：只能在系统状态发生改变时，才能获取到系统当前状态
解决方案如下：
https://blog.youkuaiyun.com/weixin_45526252/article/details/123182910