在软件开发中为了安全性,特别是那些需要用到用户名和密码登录服务端的程序,常常考虑长期无人操作,程序自动跳转到用户登录界面。
判断程序是否长时间无人操作,有两个依据,第一个是鼠标长时间不动,第二个是鼠标焦点长时间不在此程序中(即用户长时间在操作其他的程序)。
一、鼠标长时间不动
在其他博客中看到过针对鼠标长时间不动这种情况的解决方案【1】,参考此博客,将相应的代码加入到App.xaml.cs(代码如下),本文实现的是鼠标长时间不动(本例中设置10s不动)则重启该程序(因为对于需要账号密码登录的程序,鼠标长时间不动这样就能退出登录,并重新启动到登录界面,从而保证了安全性)。
/// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { private DispatcherTimer mousePositionTimer; //长时间不操作该程序退回到登录界面的计时器 private Point mousePosition; //鼠标的位置 protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); //启动程序 mousePosition = GetMousePoint(); //获取鼠标坐标 mousePositionTimer = new DispatcherTimer(); mousePositionTimer.Tick += new EventHandler(MousePositionTimedEvent); mousePositionTimer.Interval = new TimeSpan(0, 0, 10); //每隔10秒检测一次鼠标位置是否变动 mousePositionTimer.Start(); } private void MousePositionTimedEvent(object sender, EventArgs e) { if (!HaveUsedTo()) { mousePositionTimer.Stop(); //重新启动此程序 System.Windows.Forms.Application.Restart(); Application.Current.Shutdown(); } } //判断鼠标是否移动 private bool HaveUsedTo() { Point point = GetMousePoint(); if (point == mousePosition) { return false; } mousePosition = point; return true; } [StructLayout(LayoutKind.Sequential)] private struct MPoint { public int X; public int Y; public MPoint(int x, int y) { this.X = x; this.Y = y; } } [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern bool GetCursorPos(out MPoint mpt); /// 获取当前屏幕鼠标位置 public Point GetMousePoint() { MPoint mpt = new MPoint(); GetCursorPos(out mpt); Point p = new Point(mpt.X, mpt.Y); return p; } }
但是这个解决方案有个问题,如图1所示,假设计时器的间隔时间为10s,鼠标坐标的起始点为(0,0),如果鼠标10s内不动,则到10s时计时器会执行重启程序操作。但是,当时间在1s时,我们移动了鼠标(假设移动到(0,1)),然后再次鼠标长时间不动,则当时间到10s时鼠标相比0s时刻,鼠标的坐标是变动了的,从而不会执行计时器事件,程序继续10s计时,如果接下来10s鼠标也不移动,则到达20s时计时器事件才会响应重启程序的操作。这样程序实际上是经历了19s才进行程序重启,没达到10s鼠标不动则程序重启的要求。
改良后的解决方案:
经过改良,同样为了达到10s鼠标不动则程序重启的要求,我们设计了计时器的间隔时间为1s,并添加鼠标没移动的计数器,计数器达到10才执行程序重启。实现是这样的:每隔1s检测鼠标是否移动,如果不移动则计数器加1,如果中途鼠标移动,则计数器清零,要达到计数器计数为10,则要10次鼠标检测中鼠标都不移动,这样从鼠标停止移动,到计数器达到10,刚好是10s,能够达到10s鼠标不动则程序重启的要求。具体实现代码如下(注意此代码是添加在App.xaml.cs中的):
/// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { private DispatcherTimer mousePositionTimer; //长时间不操作该程序退回到登录界面的计时器 private Point mousePosition; //鼠标的位置 private int checkCount = 0; //检测鼠标位置的次数 protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); //启动程序 mousePosition = GetMousePoint(); //获取鼠标坐标 mousePositionTimer = new DispatcherTimer(); mousePositionTimer.Tick += new EventHandler(MousePositionTimedEvent); mousePositionTimer.Interval = new TimeSpan(0, 0, 1); //每隔10秒检测一次鼠标位置是否变动 mousePositionTimer.Start(); } private void MousePositionTimedEvent(object sender, EventArgs e) { if (!HaveUsedTo()) { checkCount++; //检测到鼠标没移动,checkCount + 1 if (checkCount == 10) { checkCount = 0; mousePositionTimer.Stop(); //重新启动此程序 System.Windows.Forms.Application.Restart(); Application.Current.Shutdown(); } } else { checkCount = 0; //检测到鼠标移动,重新计数 } } //判断鼠标是否移动 private bool HaveUsedTo() { Point point = GetMousePoint(); if (point == mousePosition) { return false; } mousePosition = point; return true; } [StructLayout(LayoutKind.Sequential)] private struct MPoint { public int X; public int Y; public MPoint(int x, int y) { this.X = x; this.Y = y; } } [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern bool GetCursorPos(out MPoint mpt); /// 获取当前屏幕鼠标位置 public Point GetMousePoint() { MPoint mpt = new MPoint(); GetCursorPos(out mpt); Point p = new Point(mpt.X, mpt.Y); return p; } }
二、鼠标焦点长时间不在此程序中
要用到Activated和Deactivated事件【2】:当Application中的一个top level窗体获得焦点时触发Activated事件,也就是应用程序被激活时。当用户从本应用程序切换到其他应用程序时触发Deactivated事件。具体代码如下:
App.xaml中加入Activated和Deactivated事件;
App.xaml.cs中:
/// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { private DispatcherTimer deactivatedTimer; //当焦点不在此程序上时计时器 protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); //启动程序 deactivatedTimer = new DispatcherTimer(); deactivatedTimer.Tick += new EventHandler(deactivatedTimer_Tick); deactivatedTimer.Interval = new TimeSpan(0, 0, 10); //如果焦点不在此程序中时,过10s程序自动重启 } private void deactivatedTimer_Tick(object sender, EventArgs e) { deactivatedTimer.Stop(); //重新启动此程序 System.Windows.Forms.Application.Restart(); Application.Current.Shutdown(); } private void Application_Activated(object sender, EventArgs e) { deactivatedTimer.Stop(); } private void Application_Deactivated(object sender, EventArgs e) { deactivatedTimer.Start(); } }
三、综合两种情况
本文开始时已经提出,判断程序是否长时间无人操作有两个依据,即鼠标长时间不动和鼠标焦点长时间不在此程序中,于是本文综合了两种情况,做到了真实实现程序长时间无人操作的响应。具体代码如下:
App.xaml 中加入 Activated和 Deactivated事件;
App.xaml.cs中:
/// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { private DispatcherTimer mousePositionTimer; //长时间不操作该程序退回到登录界面的计时器 private Point mousePosition; //鼠标的位置 private int checkCount = 0; //检测鼠标位置的次数 private DispatcherTimer deactivatedTimer; //当焦点不在此程序上时计时器 protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); //启动程序 mousePosition = GetMousePoint(); //获取鼠标坐标 mousePositionTimer = new DispatcherTimer(); mousePositionTimer.Tick += new EventHandler(MousePositionTimedEvent); mousePositionTimer.Interval = new TimeSpan(0, 0, 1); //每隔10秒检测一次鼠标位置是否变动 mousePositionTimer.Start(); deactivatedTimer = new DispatcherTimer(); deactivatedTimer.Tick += new EventHandler(deactivatedTimer_Tick); deactivatedTimer.Interval = new TimeSpan(0, 0, 10); //如果焦点不在此程序中时,过10s程序自动重启 } private void MousePositionTimedEvent(object sender, EventArgs e) { if (!HaveUsedTo()) { checkCount++; //检测到鼠标没移动,checkCount + 1 if (checkCount == 10) { checkCount = 0; mousePositionTimer.Stop(); //重新启动此程序 System.Windows.Forms.Application.Restart(); Application.Current.Shutdown(); } } else { checkCount = 0; //检测到鼠标移动,重新计数 } } private void deactivatedTimer_Tick(object sender, EventArgs e) { deactivatedTimer.Stop(); //重新启动此程序 System.Windows.Forms.Application.Restart(); Application.Current.Shutdown(); } //鼠标焦点回到此程序 private void Application_Activated(object sender, EventArgs e) { mousePositionTimer.Start(); deactivatedTimer.Stop(); } //鼠标焦点离开此程序 private void Application_Deactivated(object sender, EventArgs e) { mousePositionTimer.Stop(); deactivatedTimer.Start(); } //判断鼠标是否移动 private bool HaveUsedTo() { Point point = GetMousePoint(); if (point == mousePosition) { return false; } mousePosition = point; return true; } [StructLayout(LayoutKind.Sequential)] private struct MPoint { public int X; public int Y; public MPoint(int x, int y) { this.X = x; this.Y = y; } } [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern bool GetCursorPos(out MPoint mpt); /// 获取当前屏幕鼠标位置 public Point GetMousePoint() { MPoint mpt = new MPoint(); GetCursorPos(out mpt); Point p = new Point(mpt.X, mpt.Y); return p; } }
参考:
【1】 http://blog.csdn.net/yysyangyangyangshan/article/details/8621395
【2】 http://www.cnblogs.com/luluping/archive/2011/05/13/2045875.html
代码下载地址:http://download.csdn.net/detail/xiaoxiong345064855/6658825