[英]Async Sockets in C#
我正在尝试基于异步套接字编写简单的客户端服务器应用程序。 一切正常,直到我尝试连接多个客户端。 它们连接良好,但是只有“最新的”可以将数据发送到服务器,其他的则抛出异常:
“未返回IAsyncResult对象”
这是我的AcceptCallback代码:
private void AcceptCallback(IAsyncResult AR)
{
try
{
_clientSocket = _serverSocket.EndAccept(AR);
_buffer = new byte[_clientSocket.ReceiveBufferSize];
_clientSocket.BeginReceive(_buffer, 0, _buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);
_serverSocket.BeginAccept(new AsyncCallback(AcceptCallback), null);
Console.WriteLine("Client connected!");
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
任何想法有什么问题吗? 我正在学习,因此可能有些愚蠢而明显,但我看不到。
通过分配_clientSocket = _serverSocket.EndAccept(AR);
您松开了之前的_clientSocket
;
我将按照以下方式更改您的代码(要点是在ObjectState参数中传递套接字,缓冲区等必需的信息)。
请参阅BeginXXX方法的ObjectState参数。
var tcpListener = new TcpListener(IPAddress.Any, 8088);
tcpListener.Start();
tcpListener.BeginAcceptSocket(AsyncAccept, tcpListener);
.......
void AsyncAccept(IAsyncResult ar)
{
var tcpListener = (TcpListener)ar.AsyncState;
var socket = tcpListener.EndAcceptSocket(ar);
if (ar.IsCompleted)
{
Console.WriteLine(socket.RemoteEndPoint + " connected...");
var buf = new byte[0x10000];
socket.BeginReceive(buf, 0, buf.Length, SocketFlags.None, AsyncRead, new Tuple<Socket, byte[]>(socket, buf));
tcpListener.BeginAcceptSocket(AsyncAccept, tcpListener);
}
}
void AsyncRead(IAsyncResult ar)
{
var tuple = (Tuple<Socket, byte[]>)ar.AsyncState;
var socket = tuple.Item1;
var buf = tuple.Item2;
if (ar.IsCompleted)
{
var len = socket.EndReceive(ar);
var str = Encoding.UTF8.GetString(buf, 0, len);
Console.WriteLine(socket.RemoteEndPoint + ":" + str);
socket.BeginReceive(buf, 0, buf.Length, SocketFlags.None, AsyncRead, new Tuple<Socket, byte[]>(socket, buf));
}
}
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