C#下局域网屏幕监控系统的实现

1、C#下局域网屏幕监控系统的实现摘 要 介绍了用C#工具在局域网中对各工作站的屏幕活动实时监控的实现思路与设计过程，并可以通过控制中心与各工作站进行信息沟通并控制客户端，为局域网的管理提供了一种技术支持，具有很好的借鉴作用。关键词 C#;局域网;屏幕监控;信息沟通 1 引言对于局域网管理员来说，实时查看网络中各个工作站的屏幕活动情况是很正常的工作，同时也需要对不符合网络要求的操作进行信息沟通。对于现场比较远的网络系统而言，频繁地到现场去检查监督很浪费精力，一个具有屏幕监控和信息传递的软件将会大大减轻网管人员的工作负担。2 实现思路为能更好地实现软件功能的设计，从以下几方面入手来进行规划设计：(1

2、) 采用客户端和控制台方式来设计软件，客户机和控制台依据功能要求分别设计软件，并分开安装。(2) 控制台软件采用C#下的Socket通信建立与客户端的通信连接，应包括屏幕监控、屏幕锁定/解锁、强制关机、信息传递等功能。也可以用一个文本文件或数据表按特定格式保存局域网内各工作站的IP地址。(3) 在对图像的处理方面，设定多线程对通过Socket传送来的数据保存为临时位图文件后在控制台界面里进行显示。(4) 尽可能对客户端运行的程序进行隐含运行，便于管理员的控制。3 程序界面程序设计过程采用了C#常用的控件，用Socket的通信方式对通信协议进行约定定义，达到通信握手的目的。在主控台的画面显示窗体

3、里判定传送过来的图片的大小，并适时调整。其主控界面如图1所示。 图1 服务端监控4 关键代码4.1 控制端代码using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.Net.Sockets;using System.Threading;using System.Drawing;using Client;namespace RemoteControl public class RevThread public delegate v

4、oid displayRevData(Point left_top_point,Point right_bottom_point,Image data); public displayRevData display_rev_data_func; private const int local_port = 61002; private UdpClient rev_data_udp; private Thread rev_data_thread; public RevThread(displayRevData disp_function) this.display_rev_data_func =

5、 disp_function; ThreadStart ts = new ThreadStart(rev_data); rev_data_thread = new Thread(ts); rev_data_thread.Start(); public void send_monitor_to_client(string local_ip_address,string dest_ip_address) send_monitor_to_client(local_ip_address,dest_ip_address, false); public void send_monitor_to_clien

6、t(string local_ip_address,string dest_ip_address,bool send_all_screen) /IP地址及端口信息 string command_string = #IP: + local_ip_address + #IPEND#PORT: + local_port.ToString() + #PORTEND#; if (true = send_all_screen) command_string = command_string + #SENDALL#; /添加控制客户机的命令串,在客户端寻找ORDER：与CMD_END#之间的串 comman

7、d_string = command_string+ ORDER: + Program .order_string ; 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)

8、; 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.

9、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 byte50; 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_st

10、r.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, poi

11、nt_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); Po

12、int right_bottom_point = new Point(point_x, point_y); byte image_bytes = new bytebuf.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); catc

13、h (Exception e) Console.WriteLine(e.ToString(); private static string getLocalIPAddress() System.Net.IPAddress addr; / 获得本机局域网IP地址 addr = new System.Net.IPAddress(Dns.GetHostEntry(Dns.GetHostName().AddressList0.GetAddressBytes(); return addr.ToString(); public void stop() rev_data_thread.Abort(); re

14、v_data_udp.Close(); private void button1_Click(object sender, EventArgs e)/屏幕监控按钮 if (textBox1.Text.Length 5) MessageBox.Show(被监控的客户端IP地址不允许空, 确信正确, MessageBoxButtons.OK); return; Program.order_string = ;/命令串，代表发送指令内容，为空则不操作客户端 rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); privat

15、e void button3_Click(object sender, EventArgs e) if (textBox1.Text.Length 5) MessageBox.Show(被监控的客户端IP地址不允许空, 确信正确, MessageBoxButtons.OK); return; Program.order_string = LOCK; rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); private void button4_Click(object sender, EventArgs e) if

16、(textBox1.Text.Length 5) MessageBox.Show(被监控的客户端IP地址不允许空, 确信正确, MessageBoxButtons.OK); return; Program.order_string = UNLOCK; rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); private void button5_Click(object sender, EventArgs e) if (textBox1.Text.Length 5) MessageBox.Show(被监控的客户端IP

17、地址不允许空, 确信正确, MessageBoxButtons.OK); return; Program.order_string = CLOSEPC; rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); private void button6_Click(object sender, EventArgs e) if (textBox1.Text.Length 5) MessageBox.Show(被监控的客户端IP地址不允许空, 确信正确, MessageBoxButtons.OK ); return; Pro

18、gram.order_string = RESTART; rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); private void button7_Click(object sender, EventArgs e) if (textBox1.Text.Length 5) MessageBox.Show(被监控的客户端IP地址不允许空, 确信正确, MessageBoxButtons.OK); return; Program.order_string = NO LINK; rev_thread.send_monitor_to_client(comboBox1.Text, textBox1.Text); private void button8_Click(object sender, EventArgs e) if (textBox1.Text.Length 0) send_all_screen = true; IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse(ip_address), port); SendDataThread send_thread = new SendDataThre