mainform.cs

请将OpenPet.ico 放在c盘文件下 当然你也可以放在程序目录

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Net.Sockets;
using System.Threading;

namespace p2pChat
{
	/// <summary>
	/// MainForm 的摘要说明。
	/// </summary>
	public class MainForm : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.TextBox txtIp;
		private System.Windows.Forms.TextBox txtRecord;
		private System.Windows.Forms.TextBox txtName;
		private System.Windows.Forms.Button btnSend;
		private System.Windows.Forms.TextBox txtContent;
		private TcpListener tcpLister = new TcpListener(5566);	
		System.Threading.ThreadStart listenPort;
		System.Threading.Thread lister;
		private System.Windows.Forms.Label label3;	
		System.Windows.Forms.NotifyIcon NotifyIcon1;
		//托盘里显示的图标，我用的是QQ里的宠物狗的图标
		private Icon img = new Icon(@"C:\OpenPet.ico");
		System.Windows.Forms.ContextMenu nMenu;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public MainForm()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//不显示最大化按钮
			this.MaximizeBox = false;	
			//最小化时不显示在任务栏
			this.ShowInTaskbar = false;

			listenPort += new ThreadStart(this.Listen);
			lister = new Thread(listenPort);
			this.Closing += new System.ComponentModel.CancelEventHandler(abortLister);
			Initializenotifyicon();
			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		#region 初始化托盘组件
		private void Initializenotifyicon()
		{
			NotifyIcon1 = new NotifyIcon();
			NotifyIcon1.Icon = img;
			NotifyIcon1.Text = "局域网聊天程序";
			NotifyIcon1.Visible = true;
			NotifyIcon1.DoubleClick += new EventHandler(this.showMainForm);

			MenuItem [] menuArray = new MenuItem[3];
			menuArray[0] = new MenuItem();
			menuArray[0].Text = "显示主窗口";
			menuArray[0].Click += new EventHandler(this.showMainForm);
			menuArray[0].DefaultItem = true;

			menuArray[1] = new MenuItem("-");

			menuArray[2] = new MenuItem();
			menuArray[2].Text = "退出";
			menuArray[2].Click += new EventHandler(this.exitSystem);

			nMenu = new ContextMenu(menuArray);
			NotifyIcon1.ContextMenu = nMenu;
		}	
	
		//显示主窗口
		private void showMainForm(object sender,System.EventArgs e)
		{
			this.WindowState = System.Windows.Forms.FormWindowState.Normal;			
		}

		//退出程序
		private void exitSystem(object sender,System.EventArgs e)
		{
			NotifyIcon1.Visible = false;
			this.Close();
		}
		#endregion

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );					
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.txtIp = new System.Windows.Forms.TextBox();
			this.txtRecord = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.txtName = new System.Windows.Forms.TextBox();
			this.btnSend = new System.Windows.Forms.Button();
			this.txtContent = new System.Windows.Forms.TextBox();
			this.label3 = new System.Windows.Forms.Label();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(16, 232);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(72, 23);
			this.label1.TabIndex = 0;
			this.label1.Text = "目标地址：";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// txtIp
			// 
			this.txtIp.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
			this.txtIp.Location = new System.Drawing.Point(80, 232);
			this.txtIp.Name = "txtIp";
			this.txtIp.Size = new System.Drawing.Size(200, 21);
			this.txtIp.TabIndex = 1;
			this.txtIp.Text = "";
			// 
			// txtRecord
			// 
			this.txtRecord.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Left | System.Windows.Forms.AnchorStyles.Right)));
			this.txtRecord.Location = new System.Drawing.Point(16, 32);
			this.txtRecord.Multiline = true;
			this.txtRecord.Name = "txtRecord";
			this.txtRecord.ReadOnly = true;
			this.txtRecord.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
			this.txtRecord.Size = new System.Drawing.Size(264, 176);
			this.txtRecord.TabIndex = 4;
			this.txtRecord.Text = "";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(24, 256);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(48, 23);
			this.label2.TabIndex = 5;
			this.label2.Text = "呢 称：";
			this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
			// 
			// txtName
			// 
			this.txtName.Location = new System.Drawing.Point(80, 256);
			this.txtName.Name = "txtName";
			this.txtName.Size = new System.Drawing.Size(88, 21);
			this.txtName.TabIndex = 6;
			this.txtName.Text = "";
			// 
			// btnSend
			// 
			this.btnSend.Location = new System.Drawing.Point(200, 256);
			this.btnSend.Name = "btnSend";
			this.btnSend.Size = new System.Drawing.Size(64, 23);
			this.btnSend.TabIndex = 0;
			this.btnSend.Text = "发 送";
			this.btnSend.Click += new System.EventHandler(this.btnSend_Click);
			// 
			// txtContent
			// 
			this.txtContent.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left) 
				| System.Windows.Forms.AnchorStyles.Right)));
			this.txtContent.Location = new System.Drawing.Point(16, 288);
			this.txtContent.Multiline = true;
			this.txtContent.Name = "txtContent";
			this.txtContent.Size = new System.Drawing.Size(264, 152);
			this.txtContent.TabIndex = 8;
			this.txtContent.Text = "";
			// 
			// label3
			// 
			this.label3.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Left) 
				| System.Windows.Forms.AnchorStyles.Right)));
			this.label3.Location = new System.Drawing.Point(16, 8);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(100, 16);
			this.label3.TabIndex = 9;
			this.label3.Text = "聊天记录：";
			this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// MainForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(292, 453);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.txtContent);
			this.Controls.Add(this.btnSend);
			this.Controls.Add(this.txtName);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.txtRecord);
			this.Controls.Add(this.txtIp);
			this.Controls.Add(this.label1);
			this.Name = "MainForm";			
			this.Text = "局域网聊天程序";
			this.Load += new System.EventHandler(this.MainForm_Load);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new MainForm());
		}		

		//开始监听
		private void Listen()
		{
			try
			{
				tcpLister.Start();				
				while(true)
				{
					Socket s = tcpLister.AcceptSocket();
					Byte[] stream = new Byte[80];
					int i = s.Receive(stream);
					string message = System.Text.Encoding.UTF8.GetString(stream);
					this.txtRecord.AppendText(message);					
				}				
			}
			catch(System.Security.SecurityException)
			{
				MessageBox.Show("防火墙安全错误！","错误",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
			}
			catch(System.Exception)
			{
				//this.txtRecord.AppendText("已停止监听！");
			}
		}
		
		private void abortLister(object sender,System.ComponentModel.CancelEventArgs e)
		{
			this.tcpLister.Stop();
		}

		//发送
		private void btnSend_Click(object sender, System.EventArgs e)
		{
			if(this.txtContent.Text=="")
			{
				MessageBox.Show("不能发送空信息！","提示",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
			}
			else
			{
				this.Send();
			}
		}

		//发送消息
		private void Send()
		{
			try
			{
				string msg = this.txtName.Text+"  ("+System.DateTime.Now.ToString()+")\r\n"+this.txtContent.Text+"\r\n";
				TcpClient client = new TcpClient(this.txtIp.Text,5566);
				NetworkStream sendStream = client.GetStream();
				StreamWriter writer = new StreamWriter(sendStream);
				writer.Write(msg);
				writer.Flush();
				sendStream.Close();
				client.Close();
				this.txtRecord.AppendText(msg);
				this.txtContent.Clear();
			}
			catch(System.Exception)
			{
				this.txtRecord.AppendText("目标计算机拒绝连接请求！\r\n");
			}
		}

		private void MainForm_Load(object sender, System.EventArgs e)
		{
			this.txtRecord.AppendText("正在监听...\r\n");				
			lister.Name = "监听本地端口";
			lister.Start();
		}
	}
}