command_string = command_string + "#CMD_END##";

            UdpClient sender = new UdpClient();

            IPEndPoint endPoint = (new IPEndPoint(IPAddress.Parse(dest_ip_address), GlobalConsts.LOCAL_WAIT_PORT));

            try

            {

                byte[] bytes = Encoding.ASCII.GetBytes(command_string);

                sender.Send(bytes, bytes.Length, endPoint);

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex.ToString());

            }

            finally

            {

                sender.Close();

            }

        }

        private void rev_data()

        {

            rev_data_udp = new UdpClient(new IPEndPoint(IPAddress.Any, local_port));

            IPEndPoint remoteHost = null;

            while (rev_data_udp != null && Thread.CurrentThread.ThreadState.Equals(ThreadState.Running))

            {

                try

                {

                    byte[] buf = rev_data_udp.Receive(ref remoteHost);

                    //以下代码用于取出当前这个数据包对应的屏幕坐标数据

                    byte[] info = new byte[50];

                    Array.Copy(buf, 0, info, 0, 50);

                    string info_data_str = Encoding.UTF8.GetString(info);

                    int start_pos=info_data_str.IndexOf("#x_1:")+5;

                    int end_pos=info_data_str.IndexOf("y_1:");

                    int point_x = Convert.ToInt32(info_data_str.Substring(start_pos, end_pos - start_pos));

                    start_pos = end_pos + 4;

                    end_pos = info_data_str.IndexOf("x_2:");

                    int point_y = Convert.ToInt32(info_data_str.Substring(start_pos, end_pos - start_pos));

                    Point left_top_point = new Point(point_x, point_y);