c# - 套接字编程中提供了无效参数

Question

我想在 C# 中创建一个 UDP 客户端和服务器，当我运行它们时，在第一次发送和接收消息之后，这个错误就会实现。我的代码是:

byte[] barray = new byte[1024];
EndPoint ipre = new IPEndPoint(IPAddress.Any, 4040);
socketClint.Bind((IPEndPoint)ipre);
int rc = socketClint.ReceiveFrom(barray, ref ipre);

if (rc > 0)
{
    listBox1.Items.Add("Server: "+ BitConverter.ToInt32(barray,0));
}

这个错误大约是socketClint.Bind((IPEndPoint)ipre);线。

错误是:

System.Net.Sockets.SocketException was unhandled
HResult=-2147467259
Message=An invalid argument was supplied
Source=System
ErrorCode=10022
NativeErrorCode=10022
StackTrace:
   at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
   at System.Net.Sockets.Socket.Bind(EndPoint localEP)
   at client1.Form1.getmsg() in c:\Users\Inspiron 1545\Desktop\UDP\client1\client1\Form1.cs:line 38
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

内部异常:

Answer 1

Winsock 错误 10022 是 WSAEINVAL :

WSAEINVAL
10022

Invalid argument.
Some invalid argument was supplied (for example, specifying an invalid level to the setsockopt function). In some instances, it also refers to the current state of the socket — for instance, calling accept on a socket that is not listening.

在 Winsock bind() 的上下文中函数(Socket.Bind() 在内部使用)，这意味着:

WSAEINVAL

An invalid argument was supplied.

This error is returned if the socket s is already bound to an address.

一旦套接字绑定(bind)到本地地址，就不能将其重新绑定(bind)到新的本地地址。你应该只绑定(bind)一次。

因此，在您的情况下，请调用 Bind()创建后socketClint只要。不要在每次调用 socketClint.ReceiveFrom() 之前调用它.