下面是一个源程序。
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class SimpleUdpClient
{
public static void Main()
{
byte[] data = new byte[1024];
string input, stringData;
IPEndPoint ipep = new IPEndPoint(
IPAddress.Parse("127.0.0.1"), 9050);
Socket server = new Socket(AddressFamily.InterNetwork,
SocketType.Dgram, ProtocolType.Udp);
string welcome = "Hello, are you there?";
data = Encoding.ASCII.GetBytes(welcome);
server.SendTo(data, data.Length, SocketFlags.None, ipep);
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
EndPoint Remote = (EndPoint)sender;
data = new byte[1024];
//uint IOC_IN = 0x80000000;
//uint IOC_VENDOR = 0x18000000;
//uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;
//server.IOControl((int)SIO_UDP_CONNRESET, new byte[] { Convert.ToByte(false) }, null);
try
{
int recv = server.ReceiveFrom(data, ref Remote);
Console.WriteLine("Message received from {0}:", Remote.ToString());
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
while (true)
{
input = Console.ReadLine();
if (input == "exit")
break;
server.SendTo(Encoding.ASCII.GetBytes(input), Remote);
data = new byte[1024];
recv = server.ReceiveFrom(data, ref Remote);
stringData = Encoding.ASCII.GetString(data, 0, recv);
Console.WriteLine(stringData);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
Console.ReadLine();
}
Console.WriteLine("Stopping client");
server.Close();
}
}
出错行在
int recv = server.ReceiveFrom(data, ref Remote);
上面一段我自己加了个try_catch
查帖子说是可能是接收端是不是已经关闭了,或者接收端并没有打开某个端口来接收发送端发来的数据
想请教一下，究竟该如何处理这样的问题
