C# 发送和接收UDP数据包
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Sending and Receiving UDP packets
提问by PGR
The following code sends a packet on port 15000:
以下代码在端口 15000 上发送数据包：
int port = 15000;
UdpClient udp = new UdpClient();
//udp.EnableBroadcast = true; //This was suggested in a now deleted answer
IPEndPoint groupEP = new IPEndPoint(IPAddress.Broadcast, port);
string str4 = "I want to receive this!";
byte[] sendBytes4 = Encoding.ASCII.GetBytes(str4);
udp.Send(sendBytes4, sendBytes4.Length, groupEP);
udp.Close();
However, it's kind of useless if I can't then receive it on another computer. All I need is to send a command to another computer on the LAN, and for it to receive it and do something.
但是，如果我不能在另一台计算机上接收它，那它是没有用的。我所需要的只是向 LAN 上的另一台计算机发送命令，然后让它接收命令并执行某些操作。
Without using a Pcap library, is there any way I can accomplish this? The computer my program is communicating with is Windows XP 32-bit, and the sending computer is Windows 7 64-bit, if it makes a difference. I've looked into various net sendcommands, but I can't figure them out.
不使用 Pcap 库，有什么办法可以做到这一点吗？我的程序与之通信的计算机是 Windows XP 32 位，发送计算机是 Windows 7 64 位（如果有区别的话）。我查看了各种net send命令，但我无法弄清楚。
I also have access to the computer (the XP one)'s local IP, by being able to physically type 'ipconfig' on it.
我还可以访问计算机（XP 计算机）的本地 IP，通过在其上实际键入“ipconfig”。
EDIT:Here's the Receive function I'm using, copied from somewhere:
编辑：这是我正在使用的接收函数，从某处复制：
public void ReceiveBroadcast(int port)
{
Debug.WriteLine("Trying to receive...");
UdpClient client = null;
try
{
client = new UdpClient(port);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
IPEndPoint server = new IPEndPoint(IPAddress.Broadcast, port);
byte[] packet = client.Receive(ref server);
Debug.WriteLine(Encoding.ASCII.GetString(packet));
}
I'm calling ReceiveBroadcast(15000)but there's no output at all.
我正在打电话，ReceiveBroadcast(15000)但根本没有输出。
采纳答案by Turbot
Here is the simpleversion of Server and Client to send/receive UDP packets
这是simple发送/接收UDP数据包的服务器和客户端的版本
Server
服务器
IPEndPoint ServerEndPoint= new IPEndPoint(IPAddress.Any,9050);
Socket WinSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
WinSocket.Bind(ServerEndPoint);
Console.Write("Waiting for client");
IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0)
EndPoint Remote = (EndPoint)(sender);
int recv = WinSocket.ReceiveFrom(data, ref Remote);
Console.WriteLine("Message received from {0}:", Remote.ToString());
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
Client
客户
IPEndPoint RemoteEndPoint= new IPEndPoint(
IPAddress.Parse("ServerHostName"), 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, RemoteEndPoint);
回答by real_yggdrasil
There is actually a very good UDP example of a server and listener on MSDN: Simple UDP example
MSDN上实际上有一个非常好的UDP示例服务器和侦听器：Simple UDP example
