发送和接收 UDP 数据包 [英] Sending and Receiving UDP packets

问题描述

以下代码在 15000 端口发送数据包:

The following code sends a packet on port 15000:

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();

但是，如果我不能在另一台计算机上接收它，那就没用了.我所需要的只是向 LAN 上的另一台计算机发送命令，并让它接收它并执行一些操作.

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.

如果不使用 Pcap 库，我有什么办法可以做到这一点?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，但无法弄清楚.

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 send commands, but I can't figure them out.

我还可以访问计算机(XP 计算机)的本地 IP，通过在其上物理键入ipconfig".

I also have access to the computer (the XP one)'s local IP, by being able to physically type 'ipconfig' on it.

这是我正在使用的接收功能，从某处复制:

Here's the Receive function I'm using, copied from somewhere:

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));
}

我正在调用 ReceiveBroadcast(15000) 但根本没有输出.

I'm calling ReceiveBroadcast(15000) but there's no output at all.

推荐答案

这里是simple版本的Server和Client发送/接收UDP数据包

Here is the simple version of Server and Client to send/receive UDP packets

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));

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);

这篇关于发送和接收 UDP 数据包的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！