简单的点对点聊天软件

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<AddMessageEventArge> 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<AddMessageEventArge>(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); } } }}