基于UDP，P2P的网络通信

基于UDP，P2P的通信示例，通过UDP打洞技术实现，可获取到局域网内机器的对外IP和路由映射IP和端口号，实现类似QQ的两个局域网内机器的通信

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using P2P.WellKnown;


namespace P2P.P2PClient
{
    /// 

    /// AppClass 的摘要说明。
    /// 

    public class AppClass
    {
        public static void Main（）
        {
            //System.Net.WebClient wc = new System.Net.WebClient（）;
            //string ipAdress = wc.DownloadString（“http://www.zu14.cn/ip/“）;
            IPHostEntry ihe = Dns.GetHostByName（Dns.GetHostName（））;
            IPAddress myIp = ihe.AddressList[0];
            Client client = new Client（myIp.ToString（））;
            Console.WriteLine（“输入用户名：“）;
            string myname = Console.ReadLine（）;
            Console.WriteLine（“输入密码：“）;
            string mypassword = Console.ReadLine（）;
            client.ConnectToServer（myname mypassword）;
            client.Start（）;
            Console.WriteLine（“test arguments“）;
            while （true）
            {
                string str = Console.ReadLine（）;
                client.PaserCommand（str）;
            }
        }
    }
    /// 

    /// Client 的摘要说明。
    /// 

    public class Client : IDisposable
    {
        #region 定义各变量
        
        private const int MAXRETRY = 10;
        private UdpClient client;
        private IPEndPoint hostPoint;
        private IPEndPoint remotePoint;
        private UserCollection userList;
        private string myName;
        private bool ReceivedACK;
        private Thread listenThread;

        #endregion

        public Client（string serverIP）
        {
            ReceivedACK = false;
            remotePoint = new IPEndPoint（IPAddress.Any 0）;
            hostPoint = new IPEndPoint（IPAddress.Parse（serverIP） P2PConsts.SRV_PORT）;
            client = new UdpClient（）;
            userList = new UserCollection（）;
            listenThread = new Thread（new ThreadStart（Run））;
        }

        public void Start（）
        {
            if （this.listenThread.ThreadState == ThreadState.Unstarted）
            {
                this.listenThread.Start（）;
                Console.WriteLine（“输入以下命令操作符:\n“）;
                Console.WriteLine（“格式为:\“send\“\“autosend\“\“exit\“\“getu\““）;
                Console.WriteLine（“Example : send Username Message“）;
                Console.WriteLine（“          autosend“）;
                Console.WriteLine（“          exit“）;
                Console.WriteLine（“          getu“）;
            }
        }

        public void ConnectToServer（string userName string password）
        {
            myName = userName;
            // 发送登录消息到服务器
            P2P.WellKnown.C2S.LoginMessage lginMsg = new P2P.WellKnown.C2S.LoginMessage（userName password）;
            byte[] buffer = FormatterHelper.Serialize（lginMsg）;
            client.Send（buffer buffer.Length hostPoint）;
            // 接受服

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件       9728  2011-03-14 09:37  P2P.WellKnown\P2P.P2PClient\bin\Debug\P2P.P2PClient.exe

     文件      17920  2011-03-14 09:37  P2P.WellKnown\P2P.P2PClient\bin\Debug\P2P.P2PClient.pdb

     文件      11600  2011-03-14 09:38  P2P.WellKnown\P2P.P2PClient\bin\Debug\P2P.P2PClient.vshost.exe

     文件        490  2010-03-17 22:39  P2P.WellKnown\P2P.P2PClient\bin\Debug\P2P.P2PClient.vshost.exe.manifest

     文件       7168  2011-03-14 09:22  P2P.WellKnown\P2P.P2PClient\bin\Debug\P2P.WellKnown.dll

     文件      24064  2011-03-14 09:22  P2P.WellKnown\P2P.P2PClient\bin\Debug\P2P.WellKnown.pdb

     文件       5874  2011-03-14 09:37  P2P.WellKnown\P2P.P2PClient\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件        543  2011-03-14 09:38  P2P.WellKnown\P2P.P2PClient\obj\x86\Debug\P2P.P2PClient.csproj.FileListAbsolute.txt

     文件       9728  2011-03-14 09:37  P2P.WellKnown\P2P.P2PClient\obj\x86\Debug\P2P.P2PClient.exe

     文件      17920  2011-03-14 09:37  P2P.WellKnown\P2P.P2PClient\obj\x86\Debug\P2P.P2PClient.pdb

     文件       2579  2011-03-13 13:28  P2P.WellKnown\P2P.P2PClient\P2P.P2PClient.csproj

     文件      11430  2011-03-14 09:37  P2P.WellKnown\P2P.P2PClient\Program.cs

     文件       1358  2011-03-13 13:27  P2P.WellKnown\P2P.P2PClient\Properties\AssemblyInfo.cs

     文件       8192  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\bin\Debug\P2P.P2PServer.exe

     文件      15872  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\bin\Debug\P2P.P2PServer.pdb

     文件      11600  2011-03-14 09:23  P2P.WellKnown\P2P.P2PServer\bin\Debug\P2P.P2PServer.vshost.exe

     文件        490  2010-03-17 22:39  P2P.WellKnown\P2P.P2PServer\bin\Debug\P2P.P2PServer.vshost.exe.manifest

     文件       7168  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\bin\Debug\P2P.WellKnown.dll

     文件      24064  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\bin\Debug\P2P.WellKnown.pdb

     文件       5874  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件        543  2011-03-14 09:23  P2P.WellKnown\P2P.P2PServer\obj\x86\Debug\P2P.P2PServer.csproj.FileListAbsolute.txt

     文件       8192  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\obj\x86\Debug\P2P.P2PServer.exe

     文件      15872  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\obj\x86\Debug\P2P.P2PServer.pdb

     文件       9107  2011-03-14 09:22  P2P.WellKnown\P2P.P2PServer\obj\x86\Debug\ResolveAssemblyReference.cache

     文件       2579  2011-03-13 13:27  P2P.WellKnown\P2P.P2PServer\P2P.P2PServer.csproj

     文件       6952  2011-03-14 09:16  P2P.WellKnown\P2P.P2PServer\Program.cs

     文件       1358  2011-03-13 13:24  P2P.WellKnown\P2P.P2PServer\Properties\AssemblyInfo.cs

     文件       7168  2011-03-14 09:22  P2P.WellKnown\P2P.WellKnown\bin\Debug\P2P.WellKnown.dll

     文件      24064  2011-03-14 09:22  P2P.WellKnown\P2P.WellKnown\bin\Debug\P2P.WellKnown.pdb

     文件       7744  2011-03-14 09:19  P2P.WellKnown\P2P.WellKnown\Class1.cs

............此处省略35个文件信息