UPD打洞示例源码(含服务端代码)

【实例简介】

UDP打洞过程
       假设A想连接B.首先A发送打洞消息给Server,让Server告诉B有人想与你建立通话通道,Server将A的IP信息转发给B
       B收到命令后向A发一个UDP包,此时B的NAT会建立一个与A通讯的Session. 然后A再次向B发送UDP包B就能收到了

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using vjsdn.net.library;

namespace P2PServer
{
    public partial class frmServer : Form
    {
        private Server _server;

        public frmServer()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            _server = new Server();
            _server.OnWriteLog  = new WriteLogHandle(server_OnWriteLog);
            _server.OnUserChanged  = new UserChangedHandle(OnUserChanged);
            try
            {
                _server.Start();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        //刷新用户列表
        private void OnUserChanged(UserCollection users)
        {
            listBox2.DisplayMember = "FullName";
            listBox2.DataSource = null;
            listBox2.DataSource = users;
        }

        //显示跟踪消息
        public void server_OnWriteLog(string msg)
        {
            listBox1.Items.Add(msg);
            listBox1.SelectedIndex = listBox1.Items.Count - 1;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void frmServer_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (_server != null)
                _server.Stop();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            //发送消息给所有在线用户
            P2P_TalkMessage msg = new P2P_TalkMessage(textBox1.Text);
            foreach (object o in listBox2.Items)
            {
                User user = o as User;
                _server.SendMessage(msg, user.NetPoint);
            }
        }

        private void button6_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();
        }
    }
}