1.有一个注册程序,每隔4个小时就会失效,需要每隔4个小时,重启注册程序,然后还要自动单击上面的“启动验证”按钮；

     2.当程序产生一个错误日志文件时，重启注册程序,然后还要自动单击上面的“启动验证”按钮。

     思路:

     1.先找到注册程序的主窗口句柄;

     2.根据主窗口句柄找到"启动验证"按钮;

     3.向按钮发生单击消息.

    代码如下:

    string _exePath = string.Empty;

    //主窗口句柄

    IntPtr _mainIntPtr=IntPtr.Zero;

   //按钮句柄

    IntPtr _buttonIntPtr=IntPtr.Zero;

   //此处用于取得计算器窗口的句柄

   [DllImport("user32.dll", EntryPoint = "FindWindow")]

   public static extern int FindWindow(string lpClassName, string lpWindowName);

   [DllImport("user32.dll", EntryPoint = "FindWindowEx", SetLastError = true)]

   private static extern IntPtr FindWindowEx(IntPtr hwndParent, uint hwndChildAfter, string lpszClass, string lpszWindow);

   //此处用于向窗口发送消息

   [DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true, CharSet = CharSet.Auto)]

   public static extern int SendMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);

   [DllImport("user32.dll", EntryPoint = "SetForegroundWindow", SetLastError = true)]

   private static extern void SetForegroundWindow(IntPtr hwnd);

    [DllImport("user32.dll")]

    static extern IntPtr SetActiveWindow(IntPtr hWnd);

    private void button1_Click(object sender, EventArgs e)

     {

            button1.Enabled = false;

            //每10秒钟轮询一次

            System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();

            timer.Interval = 10000;

            timer.Tick += new EventHandler(timer_Tick);

            timer.Start();

     }

     //错误日志路径

     string _errPath=string.Empty;

    //注册程序路径

     string _exePath=string.Empty;

     const uint BM_CLICK = 0xF5; //鼠标点击的消息

     DateTime _startDateTime=DateTime.Now;

     DateTime _currDateTime;

     private void timer_Tick(object sender, EventArgs e)

      {            

            _errPath=this.textBox1.Text.Trim();

            _exePath = this.textBox2.Text.Trim();            

            if (File.Exists(errPath))

            {

                //表示GD已失效

                RestartProgram();

                //第四步：删除err.log

                File.Delete(errPath);

            }

            else

            {

                      TimeSpan ts=new TimeSpan();

                      _currDateTime=DateTime.Now;

                     ts=_currDateTime-_startDateTime;

                     if(ts.Hours >=4)

                     {

                            RestartProgram();

                      }

             }

         }

        private void RestartProgram()

       {

              //第一步：杀掉进程

                KillProc("KeyVerify"); 

                //第二步：重启进程

                System.Diagnostics.Process.Start(_exePath);

                System.Threading.Thread.Sleep(1000);   //暂停1000秒

                //第三步：触发按钮

                //发送触发“启动验证”按钮的消息

                int hwndKeyVerify = FindWindow(null, "验证");

                IntPtr hwndPtr = new IntPtr(hwndKeyVerify);

                IntPtr hwndButton = FindWindowEx(hwndPtr, (uint)0, "Button", "启动验证"); //获取目标程序的按钮启动验证的句柄

                SetActiveWindow(hwndButton);

                SetForegroundWindow(hwndButton);    //将目标程序设为当前活动窗口

                SendMessage(hwndButton, BM_CLICK, 0, 0);//模拟点击启动验证按钮

        }

        private void KillProc(string procName)

        {            

            try

            {

                foreach (Process proc in Process.GetProcessesByName(procName))

                {

                    if (!proc.CloseMainWindow())

                    {

                        proc.Kill();

                    }

                }

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex.Message);

            }

        }