我从一个简单的 UDPClient 程序开始使用套接字编程来发送一些数据。大代码片段如下：
using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
class ShowIP
{
public static void Main(string[] args)
{
string name = Dns.GetHostName();
//name = "GSL1460";
name = "GSL1296";
try
{
IPAddress[] addrs = Dns.GetHostEntry(name).AddressList;
foreach (IPAddress addr in addrs)
Console.WriteLine("{0}/{1}", name, addr);
Console.WriteLine("Started listening");
Thread listenerThread = new Thread(new ThreadStart(StartListeningUDP));
listenerThread.Start();
Console.WriteLine("Started sending");
for (int counter = 0; counter <= 3; counter++)
{
Thread.Sleep(1000);
Console.WriteLine("Sending {0} time", counter.ToString());
StartSendingUDP(addrs[0]);
}
Console.ReadLine();
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
private static void StartListeningUDP()
{
UdpClient udpListener = null;
IPEndPoint nwPoint = new IPEndPoint(IPAddress.Any, 12345);
while (true)
{
try
{
udpListener = new UdpClient(12345);
Console.WriteLine("Waiting to receive");
Byte[] receivedBytes = udpListener.Receive(ref nwPoint);
string receivedData = Encoding.ASCII.GetString(receivedBytes);
Console.WriteLine("Data received : " + receivedData);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
finally
{
udpListener.Close();
}
}
}
private static void StartSendingUDP(IPAddress clientAddress)
{
UdpClient udpSender = new UdpClient();
try
{
Byte[] sendBytes = Encoding.ASCII.GetBytes("Say HI to Papa...");
Console.WriteLine("Data Sent : Say HI to Papa...");
udpSender.Send(sendBytes, sendBytes.Length, new IPEndPoint(clientAddress, 12345));
}
finally
{
udpSender.Close();
}
}
}
该示例在本地计算机上运行良好，但无法将数据发送到 Intranet 上的另一台计算机。
在测试期间
- 我正在取消注释适当的代码以将数据发送到他的机器
- 我正在他的机器上运行接收器位
- 已检查他的机器上是否打开了所需的端口
我错过了什么吗？请建议。