c# 套接字编程的一个很奇怪的问题
在网上看了一个简单的例子，编译运行一切正常，但我在服务器端使用
/*************************/
Socket temp = s.Accept();//为新建连接创建新的Socket。
Console.WriteLine( "remoteEndpoin {0} ",temp.RemoteEndPoint.ToString());
/*************************/
输出客户端的ip地址和端口号时，ip地址是对的 127.0.0.1
但端口号却是个随机值 ，这是什么原因？
代码如下
/******************************************************************/
服务器端：
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
namespace socket
{
class serverApp
{
static void Main(string[] args)
{
try
{
int port = 2000;
string host = "127.0.0.1 ";
IPAddress ip = IPAddress.Parse(host);
IPEndPoint ipe = new IPEndPoint(ip, port);
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket类
s.Bind(ipe);//绑定2000端口
s.Listen(0);//开始监听
Console.WriteLine( "Wait for connect ");
Socket temp = s.Accept();//为新建连接创建新的Socket。
Console.WriteLine( "remoteEndpoin {0} ",temp.RemoteEndPoint.ToString());
Console.WriteLine( "Get a connect ");
string recvStr = " ";
byte[] recvBytes = new byte[1024];
int bytes;
bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//从客户端接受信息
recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
Console.WriteLine( "Server Get Message:{0} ", recvStr);//把客户端传来的信息显示出来
string sendStr = "Ok!Client Send Message Sucessful! ";
byte[] bs = Encoding.ASCII.GetBytes(sendStr);
temp.Send(bs, bs.Length, 0);//返回客户端成功信息
temp.Close();
s.Close();
}
catch (ArgumentNullException e)
{
Console.WriteLine( "ArgumentNullException: {0} ", e);
}
catch (SocketException e)
{
Console.WriteLine( "SocketException: {0} ", e);
}
Console.WriteLine( "Press Enter to Exit ");
Console.ReadLine();
}
}
}
/******************************************************************/
客户端
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;
namespace client
{
class clientApp
{
static void Main(string[] args)
{
try
{
int port = 2000;
string host = "127.0.0.1 ";
IPAddress ip = IPAddress.Parse(host);
IPEndPoint ipe = new IPEndPoint(ip, port);//把ip和端口转化为IPEndPoint实例
Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个Socket
Console.WriteLine( "Conneting... ");
c.Connect(ipe);//连接到服务器
string sendStr = "hello!This is a socket test ";
byte[] bs = Encoding.ASCII.GetBytes(sendStr);
Console.WriteLine( "Send Message ");
c.Send(bs, bs.Length, 0);//发送测试信息
string recvStr = " ";
byte[] recvBytes = new byte[1024];
int bytes;
bytes = c.Receive(recvBytes, recvBytes.Length, 0);//从服务器端接受返回信息
recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
Console.WriteLine( "Client Get Message:{0} ", recvStr);//显示服务器返回信息
c.Close();
}
catch (ArgumentNullException e)
{
Console.WriteLine( "ArgumentNullException: {0} ", e);
}
catch (SocketException e)
{
Console.WriteLine( "SocketException: {0} ", e);
}
Console.WriteLine( "Press Enter to Exit ");
Console.ReadLine();
}
}
}
[解决办法]
客户端的端口号本来就是随机的！
