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.Threading;

namespace UdpServer
{
    public partial class Server : Form
    {
        public Server()
        {
            Control.CheckForIllegalCrossThreadCalls = false;
            InitializeComponent();
        }
        Socket connectionSocket = null;
        private void btnStart_Click(object sender, EventArgs e)
        {
            connectionSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            IPEndPoint iPEndPoint = new IPEndPoint(IPAddress.Parse(txtIp.Text.Trim()), Convert.ToInt32(txtPort.Text.Trim()));
            connectionSocket.Bind(iPEndPoint);
            Thread acceptThread = new Thread(Accept);
            acceptThread.IsBackground = true;
            acceptThread.Start();
        }
        void Accept()
        {
            while (true)
            {
                byte[] by = new byte[1024];
                IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
                EndPoint iPEndPoint = (EndPoint)sender;
                int rev = connectionSocket.ReceiveFrom(by, ref iPEndPoint);
                txtReceiveMsg.AppendText(DateTime.Now + " " + iPEndPoint.ToString() + " 说:" + System.Text.Encoding.Default.GetString(by, 0, rev) + "\r\n");

            }

        }
        Socket sendSocket = null;
        private void btnSend_Click(object sender, EventArgs e)
        {
            sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            IPEndPoint iPEndPoint = new IPEndPoint(IPAddress.Parse(txtIp.Text.Trim()), 10002);
            EndPoint endPoint = (EndPoint)iPEndPoint;
            sendSocket.SendTo(System.Text.Encoding.Default.GetBytes(txtSendMsg.Text.Trim()), iPEndPoint);
        }

    }
}