using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace UDPServer
{
    public partial class Frm_Server : Form
    {
        UdpClient client;
        IPEndPoint endpoint;
        Dictionary<string, IPEndPoint> userinfo = new Dictionary<string, IPEndPoint>();
        public Frm_Server()
        {
            InitializeComponent();
        }

        private void Frm_Server_Load(object sender, EventArgs e)
        {
            client = new UdpClient(new IPEndPoint(IPAddress.Any, 25433));
            endpoint = new IPEndPoint(IPAddress.Any, 0);
            //启动客户端监听
            Thread t = new Thread(new ThreadStart(ClientThread));
            t.Start();

        }


        private void button_Click(object sender, EventArgs e)
        {

            foreach (var item in userinfo)
            {
                byte[] buf = Encoding.Default.GetBytes("用户: " + item.Key + " 消息: " + msg.Text);
                client.Send(buf, buf.Length, item.Value);
            }
        }

        private void ClientThread()
        {
            try
            {
                Console.WriteLine("服务器开始监听...");
                while (true)
                {
                    byte[] buf = client.Receive(ref endpoint);
                    string msg = Encoding.Default.GetString(buf);
                    string[] info = msg.Split(' ');
                    if (info.Length == 3)
                    {
                        string user = info[0];
                        string ip = info[1];
                        int port = int.Parse(info[2]);
                        IPEndPoint addr = new IPEndPoint(IPAddress.Parse(ip), port);
                        if (userinfo.ContainsKey(user))
                            userinfo.Remove(user);
                        userinfo.Add(user, addr);
                        Console.WriteLine("用户: " + user + " 登录服务器 IP: " + ip + " 端口: " + port);
                    }
                }
            }
            catch (Exception)
            {
                client.Close();
            }

        }
    }
}