using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;

namespace Dachie
{
class Program
    {
static void Main(string[] args)
        {            
        }
    }
public class MessageUtility
    {

//缺省端口号
        private const int DEFAULT_PORT = 49967;

private MessageUtility()
        {
//
// TODO: 在此处添加构造函数逻辑
//
        }

//发送消息方法
        public static void SendMessage(string msg)
        {
byte[] data = new byte[1024];
//本机主机信息
            IPHostEntry host = Dns.GetHostByName(Dns.GetHostName());

//端口号参数以后重构时可以做成一个方法从配置文件中读取端口号
            IPEndPoint ipep = new IPEndPoint(host.AddressList[0], DEFAULT_PORT);

//创建一个udp套接字
            Socket server = new Socket(AddressFamily.InterNetwork,
                SocketType.Dgram, ProtocolType.Udp);

if (msg.Length != 0)
            {
                data = Encoding.Unicode.GetBytes(msg);
try
                {
                    server.SendTo(data, data.Length, SocketFlags.None, ipep);
                }
catch (SocketException) { }
finally
                {
                    server.Close();
                }

            }

        }

//接受消息方法
        public static string ReceiveMessage()
        {
int recv;
byte[] data = new byte[1024];

//创建一个随机终结点对象
            IPEndPoint ipep = new IPEndPoint(IPAddress.Any, DEFAULT_PORT);

//创建一个Udp套接字
            Socket newsock = new Socket(
                AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

//将随机终结点与Udp套接字绑定，以等待流入的数据包
            newsock.Bind(ipep);

//创建一个接受任意发送者的终结点
            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
            EndPoint tmpRemote = (EndPoint)(sender);

try
            {
                recv = newsock.ReceiveFrom(data, ref tmpRemote);
return Encoding.Unicode.GetString(data, 0, data.Length);
            }
catch (SocketException)
            {
return null;
            }
finally
            {
                newsock.Close();//关闭套接字释放资源
            }

        }

    }
}