根据类名和窗口名操作窗体

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/// <summary>         /// 根据类名和窗口名获取句柄         /// </summary>         /// <param name="lpClassName"></param>         /// <param name="lpWindowName"></param>         /// <returns></returns>         [DllImport("user32.dll")]         public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);         /// <summary>         /// 给窗口发送消息         /// </summary>         /// <param name="hwnd"></param>         /// <param name="wMsg"></param>         /// <param name="wParam"></param>         /// <param name="lParam"></param>         /// <returns></returns>           [DllImport("user32.dll", EntryPoint = "SendMessage")]         private static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);         private void button1_Click(object sender, EventArgs e)         {             IntPtr str = FindWindow("#32770", "CmIDCard");             SendMessage(str, 0x10, 0, 0);//关闭窗体         }