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);

                    start_pos = end_pos + 4;

                    end_pos = info_data_str.IndexOf("y_2:");

                    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("#####");

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

                    Point right_bottom_point = new Point(point_x, point_y);

                    byte[] image_bytes = new byte[buf.Length-50];

                    Array.Copy(buf, 50, image_bytes, 0, image_bytes.Length);

                    Image data = Screen.BytesToImg(image_bytes);

                    if (null != display_rev_data_func)

                    {

                        display_rev_data_func(left_top_point,right_bottom_point,data);

                    }

                }