服务器端程序

1、服务器端程序 public partial class teacher : Form / 定义对象变量 /定义服务器线程对象 private Thread serverThread; private Thread recvThread; privateTcpListenertch_TcpListener; privateNetworkStreamnetworkstream; privateStreamReaderstreamreader; privateStreamWriterstreamwriter; private Socket socketforclient; private void

2、Listen)/教师机监听方法定义 try Int32 port = Int32.Parse(text_port.Text); /将文本框输入的端口号转换后赋予变量 port IPAddressipaddress = (IPAddress)Dns.GetHostAddresses(Dns.GetHostName().GetValue(0); /获取主机 IP 地址 TcpListenertch_TcpListener = new TcpListener(ipaddress, port); /实例化监听对象 tch_Tc pListener.Start(10);/开始侦听，并发接收数为 10 l

3、istBoxl.ltems.AddC 服务已启动！); button_up.Enabled = false; button_stop.Enabled = true; button_send.Enabled = true; socketforclient = tch_Tc pListener.Acce ptSocket()返/ 回可以用以处理链接的 Socket 实例 if(socketforclient.Connected)/ 如果连接成功 listBox1.Items.Add(教师机成功连接上学生机！); networkstream = new NetworkStream(socketfor

4、client); /实例化流对象 streamreader = new StreamReader(networkstream); streamwriter = new StreamWriter(networkstream); /接收进程开始接收数据 recvThread = new Thread(new ThreadStart(RecvData); /启动接收进程 recvThread.Start(); catch (Exception exc) MessageBox.Show(exc.Message教师机提示！); private void RecvData() /接收信息方法 string

5、 msg = streamreader.ReadLine(); 从/ 当前流中读取一行字符并将数据作为字符串返回 while (!msg.Equals(exit) / 如果接收到的学生机信息不是 exit ，就不断接收信息 listBoxl.ltems.AddC 学生提问：+ msg ); msg = streamreader.ReadLine(); button_up.Enabled = true; button_stop.Enabled = false; button_send.Enabled = false; listBoxl.ltems.AddC 学生机已经关闭！); listBox1

6、.ltems.Add(教师机关闭！); ReleaseResource();/调用释放资源方法 private void Send_data() /发送数据方法 if (text_tech.Text != ) listBox1.Items.Add(老师说：+ text_tech.Text); streamwriter.WriteLine(text_tech.Text); /向当前的数据流写入一行字符串，发送数据。 streamwriter.Flush();/ 刷新当前数据流中的数据 text_tech.Text = ; else MessageBox.Show（发送信息不能为空,教师机提示）;

7、 private void ReleaseResource() / 释放资源方法，关闭所有对象，关闭连接 networkstream.Close(); streamwriter.Close(); streamreader.Close(); socketforclientShutdown(SocketShutdown.Both/SocketShutdown枚举类型： /SocketShutdown.Send禁止 Socket发送数据； /SocketShutdown.Receiv禁止 Socket接收数据； /SocketShutdown.Both禁止 Socket接收和发送数据; socket

8、forclient.Close(); /教师机的构造函数，系统自动产生的 public teacher() lnitializeComponent(); System.Windows.Forms.Control.CheckForlllegalCrossThreadCalls = false; /发送按钮不可用 private void Form1_Load(object sender, EventArgs e) button_send.Enabled = false; button_stop.Enabled = false; private void button_up_Click(objec

9、t sender, EventArgs e) serverThread = new Thread(new ThreadStart(Listen); /建立一个线程，调用监听方法 serverThread.StartO;II new ThreadStart(Listen)：为 Listen 建立一个委托 private void button_stop_Click(object sender, EventArgs e) if (button_stop.Enabled = true) 但不允许发送信息 II 停止服务后，允许启动服务， /要退出时，发送 exit 信息给学生机 /刷新发送缓冲区 b

10、utton_up.Enabled = true; button_stop.Enabled = false; button_send.Enabled = false; string Exit_msg = exit; streamwriter.WriteLine(Exit_msg); streamwriter.Flush(); listBox1.Items.Add(教 师机关闭！); /停止接收线程 /释放资源，关闭所使用的对象 recvThread.Abort(); ReleaseResource(); else button_up.Enabled = true; button_stop.Ena

11、bled = false; button_send.Enabled = false; listBox1.ltems.Add(教师机关闭！); tch_Tc pListener.Sto pO/终止与客户机的连接 serverThread.Abort(); private void button_send_Click(object sender, EventArgs e) Thread Send_Thread = new Thread(new ThreadStart(Send_data); Send_Thread.Start(); new ThreadStart(Send_data):为 Send_data函数建立一个委