简单的点对点聊天软件

http://blog.csdn.net/highplayer/article/details/5992311

在两台电脑上同时运行本程序，可以实现点对点的聊天。

输入对方IP，连接即可聊天。

源代码：

类ClassListener，监听通信信息。

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Net;
 using System.Threading;
 using System.Net.Sockets;
 using System.Windows.Forms;
 namespace PToP
 {
     public class AddMessageEventArge : EventArgs
     {
         public string mess; //定义一个全局变量
     }
     class ClassListener
     {
         private Thread th;
         private TcpListener tcp1;
         public bool listenerRun = true;
         public event EventHandler OnAddMessage;
         //启动线程开始监听
         public void StartListen()
         {
             th = new Thread(new ThreadStart(Listen));
             th.Start();
         }
         //停止监听
         public void stop()
         {
             tcp1.Stop();
             th.Abort();
         }
         public void Listen()
         {
             try
             {
                 IPAddress addr = new IPAddress(Dns.GetHostByName(Dns.GetHostName()).AddressList[0].Address);
                 IPEndPoint iplocalendpoint = new IPEndPoint(addr, 5656);
                 tcp1 = new TcpListener(iplocalendpoint);
                 tcp1.Start();
                 while (listenerRun)
                 {
                     Socket s = tcp1.AcceptSocket();
                     string remote = s.RemoteEndPoint.ToString();
                     Byte[] stream = new Byte[512];
                     int i = s.Receive(stream);
                     string msg = "<" + remote + ">" + System.Text.Encoding.UTF8.GetString(stream);

                     AddMessageEventArge arg = new AddMessageEventArge();
                     arg.mess = msg;
                     OnAddMessage(this, arg);
                 }
             }
             catch(Exception ex)
             {
                 MessageBox.Show(ex.ToString());
             }
         }
     }
 }

类ClassSender,实现发送聊天信息

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Net.Sockets;
 using System.Net;
 using System.Threading;
 using System.Windows.Forms;
 namespace PToP
 {
     class ClassSender
     {
         private string obj;
         public ClassSender(string str)
         {
             obj=str;
         }
         public void Send(string str)
         {
             try
             {
                 TcpClient tcpc = new TcpClient(obj, 5656);
                 NetworkStream tcpstream = tcpc.GetStream();
                 Byte[] data = System.Text.Encoding.ASCII.GetBytes(str);
                 tcpstream.Write(data, 0, data.Length);
                 tcpstream.Close();
                 tcpc.Close();
             }
             catch(Exception)
             {
                 MessageBox.Show("连接被目标主机拒绝!");
             }
         }
     }
 }

窗体代码中，添加连接目标计算机和发送聊天信息的程序

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 using System.Net;
 using System.Net.Sockets;
 using System.Net.Security;
 namespace PToP
 {
     public partial class Form1 : Form
     {
         //定义委托
         public delegate void InvokeDelegate();

         public bool appRun = true;
         private ClassListener Lie;
         private ClassSender sen;

         string Strs = "";

         public Form1()
         {
             InitializeComponent();
         }


         private void button3_Click(object sender, EventArgs e)
         {
             Application.Exit();
         }

         private void Form1_Load(object sender, EventArgs e)
         {

         }

         //接收事件
         void Lie_OnAddMessage(object sender, AddMessageEventArge e)
         {
             Strs = e.mess.ToString();
             Invoke_Click(null, null);
         }

         //委托

         private void Invoke_Click(object sender, EventArgs e)
         {
             textBox1.BeginInvoke(new InvokeDelegate(InvokeMethod));
         }
         public void InvokeMethod()
         {
             if (textBox1.Text == "")
             {
                 textBox1.Text = Strs;
             }
             else
             {
                 textBox1.Text = textBox1.Text + "/r/n" + Strs;
             }
         }
         //连接目标计算机
         private void button1_Click(object sender, EventArgs e)
         {
             try
             {
                 //连接
                 Lie.listenerRun = false;
                 Lie.stop();
             }
             catch (NullReferenceException) { ;}
             finally
             {
                 Lie = new ClassListener();
                 Lie.OnAddMessage +=new EventHandler(Lie_OnAddMessage);
                 Lie.StartListen();
             }
         }
         //发送聊天记录信息
         private void button2_Click(object sender, EventArgs e)
         {
             if (textBox3.Text == "")
             {
                 MessageBox.Show("请输入目标主机的IP地址");
             }
             else if (textBox2.Text == "")
             {
                 MessageBox.Show("不能发送空信息!");
             }
             else
             {
                 IPAddress ipaddress = new System.Net.IPAddress(Dns.GetHostByName(Dns.GetHostName()).AddressList[0].Address);

                 if (textBox1.Text == "")
                 {
                     textBox1.Text = "<" + ipaddress.ToString() + "> " + textBox2.Text;
                 }
                 else
                 {
                     textBox1.Text =textBox1.Text +"/r/n"+ "<" + ipaddress.ToString() + "> " + textBox2.Text;
                 }
                 sen = new ClassSender(textBox3.Text);
                 sen.Send(textBox2.Text);
             }
         }

     }
 }