c# winform 如何得知用户是否正在操作电脑

beambeam 2008-11-20 10:41:03

c# winform 如何得知用户是否正在操作电脑
就像QQ的那个离开状态，当用户离开电脑不操作时，QQ就会检测到用户已离开,这个功能用C#如何做
还有就是不要建议我用全局钩子，因为这样会比较耗资源

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开机了大家发生对话框 2009-10-18

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学习的。。。。

gomoku 2008-11-20

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namespace ActivityMonitor

{

    using System;

    using System.Runtime.InteropServices;



    class ActivityMonitor : System.ComponentModel.Component

    {

        public void Start() 

        {

            this.isIdle = false;

            timer.Elapsed -= Timer_Elapsed;

            timer.Elapsed += Timer_Elapsed;

            timer.Interval = this.resolution;

            timer.Start();

        }



        public void Stop() 

        {

            timer.Stop();

        }



        public bool IsIdle 

        {

            get { return this.isIdle; }

            private set

            {

                if (this.isIdle != value)

                {

                    this.isIdle = value;



                    if (isIdle && OnIdle != null)

                    {

                        OnIdle(this, EventArgs.Empty);

                    }

                    if (!isIdle && OnActive != null)

                    {

                        OnActive(this, EventArgs.Empty);

                    }

                }

            }

        }



        public int IdleTimeOut 

        { 

            get { return idleTimeOut; }

            set { idleTimeOut = Math.Max(50, value); }

        }



        public int Resolution 

        { 

            get { return resolution; } 

            set { resolution = Math.Max(50, value); } 

        }



        public event EventHandler OnIdle;

        public event EventHandler OnActive;



        private void Timer_Elapsed(object sender, EventArgs e)

        {

            LASTINPUTINFO lastInputInfo = new LASTINPUTINFO();

            lastInputInfo.size = 8;



            if (GetLastInputInfo(ref lastInputInfo))

            {

                lastActivity = Math.Max(lastActivity, lastInputInfo.lastTick);



                int diff = Environment.TickCount - lastActivity;

                this.IsIdle = diff > this.IdleTimeOut;

            }

        }



        private bool isIdle = false;

        private int idleTimeOut = 5000;

        private int resolution = 100;

        private int lastActivity = Environment.TickCount;

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



        [StructLayout(LayoutKind.Sequential)]

        private struct LASTINPUTINFO

        {

            public int size;

            public int lastTick;

        }

        [DllImport("User32")]

        private static extern bool GetLastInputInfo(ref LASTINPUTINFO lii);

    }











    class UnitTest

    {

        static void Main()

        {

            ActivityMonitor monitor = new ActivityMonitor();

            monitor.IdleTimeOut = 2000;                                     // 2 seconds

            monitor.OnIdle += delegate { Console.WriteLine("On idle"); };

            monitor.OnActive += delegate { Console.WriteLine("On active"); };



            monitor.Start();

            Console.ReadLine();

        }

    }

}