.NET 中的 UDP 发送/接收
我是 UDP 新手。使用测试环境，我能够发送/接收单个 UDP 消息。但是，我正在尝试弄清楚如何接收多个 UDP 消息。我希望 MyListener 服务能够全天接收 UDP 数据包，无论何时我发送它们。我很感激任何帮助。
PS - 正如下面的答案中所述，如果我在 DoSomethingWithThisText 周围放置一段时间（true），那么这将在调试时起作用。但是，当尝试将 MyListener 作为服务运行时，它将不起作用，因为 Start 永远不会超过 while(true) 循环。
我的侦听器服务如下所示...
public class MyListener
{
private udpClient udpListener;
private int udpPort = 51551;
public void Start()
{
udpListener = new UdpClient(udpPort);
IPEndPoint listenerEndPoint = new IPEndPoint(IPAddress.Any, udpPort);
Byte[] message = udpListener.Receive(ref listenerEndPoint);
Console.WriteLine(Encoding.UTF8.GetString(message));
DoSomethingWithThisText(Encoding.UTF8.GetString(message));
}
}
我的发件人如下所示：
static void Main(string[] args)
{
IPAddress ipAddress = new IPAddress(new byte[] { 127, 0, 0, 1 });
int port = 51551;
//define some variables.
Console.Read();
UdpClient client = new UdpClient();
client.Connect(new System.Net.IPEndPoint(ipAddress, port));
Byte[] message = Encoding.UTF8.GetBytes(string.Format("var1={0}&var2={1}&var3={2}", new string[] { v1, v2, v3 }));
client.Send(message, message.Length);
client.Close();
Console.WriteLine(string.Format("Sent message");
Console.Read();
}
I'm new to UDP. Using a test environment, I am able to send/receive a single UDP message. However, I’m trying to figure out how to receive multiple UDP messages. I'd like MyListener service to receive UDP packets all day long, whenever I send them. I appreciate any help.
PS - As noted below in an answer, if I put a while(true) around my DoSomethingWithThisText, that will work while debugging. However, it won't work when trying to run MyListener as a service, because Start will never get past the while(true) loop.
My listener service looks like this...
public class MyListener
{
private udpClient udpListener;
private int udpPort = 51551;
public void Start()
{
udpListener = new UdpClient(udpPort);
IPEndPoint listenerEndPoint = new IPEndPoint(IPAddress.Any, udpPort);
Byte[] message = udpListener.Receive(ref listenerEndPoint);
Console.WriteLine(Encoding.UTF8.GetString(message));
DoSomethingWithThisText(Encoding.UTF8.GetString(message));
}
}
My sender looks like this:
static void Main(string[] args)
{
IPAddress ipAddress = new IPAddress(new byte[] { 127, 0, 0, 1 });
int port = 51551;
//define some variables.
Console.Read();
UdpClient client = new UdpClient();
client.Connect(new System.Net.IPEndPoint(ipAddress, port));
Byte[] message = Encoding.UTF8.GetBytes(string.Format("var1={0}&var2={1}&var3={2}", new string[] { v1, v2, v3 }));
client.Send(message, message.Length);
client.Close();
Console.WriteLine(string.Format("Sent message");
Console.Read();
}
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您应该在一段时间内或其他循环中调用接收。
You should call the receive from within a while or some other loop.
我最终使用了微软的异步方法，在这里找到 - BeginReceive 和 结束接收 。
正如 Microsoft 建议的那样，我在 Start 方法中调用 BeginReceive，如下所示：
但是，为了让侦听器继续接收消息，我在 ReceiveCallback 函数中递归地调用 BeginReceive AGAIN。当然，这是潜在的内存泄漏，但我在回归测试中尚未遇到问题。
I ended up using Microsoft's asynchronous methods, found here - BeginReceive and EndReceive .
Like Microsoft suggests, I call BeginReceive within my Start method like this:
However, to get the listener to continue receiving messages, I call BeginReceive AGAIN within the ReceiveCallback function, recursively. This, of course, is a potential memory leak, but I've yet to encounter problems in my regression testing.