using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace VistaRenderer

{

    public partial class FrmTestTimeout : Form

    {

        public FrmTestTimeout()

        {

            InitializeComponent();// this.timer1 = new System.Windows.Forms.Timer(this.components);

        }

        private void FrmTestTimeout_Load(object sender, EventArgs e)

        {

            timer1.Enabled = true;

            timer1.Interval = 2 * 1000;// 计时器触发间隔 2秒

            this.timer1.Tick += new EventHandler(timer1_Tick);

        }

        /// <summary>

        /// 计时器触发

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        void timer1_Tick(object sender, EventArgs e)

        {

            // 距离上一次系统输入时间大于5秒

            if (GetLastInputTime() >=  5 * 1000)

            {

                MessageBox.Show("time out");//这里可以写超时处理，比如弹出一个锁定窗口

            }

        }

        [StructLayout(LayoutKind.Sequential)]

        struct LASTINPUTINFO

        {

            [MarshalAs(UnmanagedType.U4)]

            public int cbSize;

            [MarshalAs(UnmanagedType.U4)]

            public uint dwTime;

        }

        [DllImport("user32.dll")]

        static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

        /// <summary>

        /// 获得距离上一次操作时间间隔

        /// </summary>

        /// <returns></returns>

        static long GetLastInputTime()

        {

            LASTINPUTINFO vLastInputInfo = new LASTINPUTINFO();

            vLastInputInfo.cbSize = Marshal.SizeOf(vLastInputInfo);

            if (!GetLastInputInfo(ref vLastInputInfo)) return 0;

            return Environment.TickCount - (long)vLastInputInfo.dwTime;

        }

    }

}