Question

我遇到一个自定义事件的问题，该事件会启动屏幕保护程序开启/关闭事件，当程序启动并且我的屏幕保护程序打开时，我的程序没有触发事件的屏幕保护程序！

我的代码如下，任何和所有帮助将不胜感激=]

class ScreensaverStatusWatcher
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SystemParametersInfo(int uAction, int uParam, ref int ipvParam, int fuWinini);

        private const int screenSaverRunningStartup = -1;

        const int SPI_GETSCREENSAVERRUNNING = 114;

        private static readonly Logger Logger = LogManager.GetCurrentClassLogger();

        private bool ScreensaverStatus = false;

        private readonly System.Timers.Timer timer = new System.Timers.Timer();

        public int Interval { get; set; }

        public event EventHandler<EventArgs> ScreensaverOn;

        public event EventHandler<EventArgs> ScreensaverOff;

        public ScreensaverStatusWatcher()
        {
            timer.Interval = 1000 * 5;
            this.Initialize();
        }

        public ScreensaverStatusWatcher(int interval)
        {
            timer.Interval = interval;
            this.Initialize();
        }

        private void Initialize()
        {
            timer.Elapsed += timer_Elapsed;
        }

        public void Start()
        {
            timer.Start();
        }

        public void Stop()
        {
            timer.Stop();
        }

        public bool IsScreenSaverRunning()
        {
            int screenSaverRunning = -1;
            int ok = SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, ref screenSaverRunning, 0);

            //return - on fail
            if (ok == 0)
            {
                return false;
            }

            return (screenSaverRunning != 0);
        }

        void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            if (!this.ScreensaverStatus && this.IsScreenSaverRunning())
            {
                this.ScreensaverStatus = true;
                this.OnScreensaverOn(new EventArgs());
            }
            else if(this.ScreensaverStatus && !this.IsScreenSaverRunning())
            {
                this.ScreensaverStatus = false;
                this.OnScreensaverOff(new EventArgs());
            }
        }

        private void OnScreensaverOn(EventArgs e)
        {
            if (this.ScreensaverOn != null)
            {
                this.ScreensaverOn(this, e);
            }            
        }

        private void OnScreensaverOff(EventArgs e)
        {
            if (this.ScreensaverOff != null)
            {
                this.ScreensaverOff(this, e);
            }
        }
    }
}

更新这是使用此类的代码

private ScreensaverStatusWatcher watcher = new ScreensaverStatusWatcher();

void watcher_ScreensaverOn(object sender, EventArgs e)
        {
            var data = LogDataFactory.CollectData();
            data.EventType = UserStateEvents.ScreensaverOn;

            PublishLogData(data);


        }

        void watcher_ScreensaverOff(object sender, EventArgs e)
        {
            var data = LogDataFactory.CollectData();
            data.EventType = UserStateEvents.ScreensaverOff;

            PublishLogData(data);

Answer 1

除非您没有向我们展示某些代码，否则您不会在任何地方调用Start方法来设置计时器运行。因此，Elapsed事件永远不会触发，因此您永远不会读取屏幕保护程序的状态。

为什么我的屏幕保护程序开/关事件没有被解雇？

1 个答案: