相关疑难解决方法(0)

嗨,我一直在寻找,但我找不到答案.我怎么知道屏幕何时关闭或打开.不是SystemEvents.PowerModeChanged.我不知道如何检索显示/屏幕事件

 private const int WM_POWERBROADCAST     = 0x0218;
        private const int WM_SYSCOMMAND         = 0x0112;
        private const int SC_SCREENSAVE         = 0xF140;
        private const int SC_CLOSE              = 0xF060; // dont know
        private const int SC_MONITORPOWER       = 0xF170;
        private const int SC_MAXIMIZE           = 0xF030; // dont know
        private const int MONITORON = -1;
        private const int MONITOROFF = 2;
        private const int MONITORSTANBY = 1; 
[DllImport("user32.dll")]
        //static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
        private static extern int SendMessage(IntPtr hWnd, int …