我编写了一个服务器端应用程序,它使用BeginSend()
和管理许多客户端EndSend()
在过去的几个小时里,我一直在努力确保不会BeginSend()
为同一个客户拨打后续电话。
似乎以下代码片段没有达到我的目标,并且SendAsyncData
在第一次完成之前不会阻止第二次调用。
我的错误是什么?
struct SendBuffer
{
public const int BUFFER_SIZE = 1024 * 128;
public byte[] BUFFER;
public int sent;
public SendBuffer(byte[] data)
{
BUFFER = new byte[data.Length];
Buffer.BlockCopy(data, 0, BUFFER, 0, data.Length);
sent = 0;
}
public void Dispose()
{
BUFFER = null;
sent = 0;
}
}
private void SendAsyncDataWithHeader(byte[] data
{
int toSend;
byte[] dataWithHeader = Combine(BitConverter.GetBytes(data.Length), data);
SendAutoResetEvent.WaitOne();
sendBuffer = new SendBuffer(dataWithHeader);
if (sendBuffer.BUFFER.Length - sendBuffer.sent > SendBuffer.BUFFER_SIZE)
toSend = SendBuffer.BUFFER_SIZE;
else
toSend = sendBuffer.BUFFER.Length - sendBuffer.sent;
try
{
socket.BeginSend(sendBuffer.BUFFER, 0, toSend, SocketFlags.None, sendCallback, null);
}
catch (SocketException se)
{
switch (se.SocketErrorCode)
{
case SocketError.ConnectionAborted:
case SocketError.ConnectionReset:
if (Disconnected != null)
{
Disconnected(this);
}
break;
}
}
catch (ObjectDisposedException)
{
}
catch (NullReferenceException ex)
{
}
catch (Exception ex)
{
Server.logger.Error(ex);
Disconnected(this);
}
}
void sendCallback(IAsyncResult ar)
{
int bytesSent;
try
{
bytesSent = socket.EndSend(ar);
if (bytesSent == 0)
{
if (Disconnected != null)
{
Disconnected(this);
return;
}
}
sendBuffer.sent += bytesSent;
if (sendBuffer.sent == sendBuffer.BUFFER.Length)
{
sendBuffer.Dispose();
SendAutoResetEvent.Set();
Server.logger.Info("set {0}", userName);
}
else
{
int toSend;
if (sendBuffer.BUFFER.Length - sendBuffer.sent > SendBuffer.BUFFER_SIZE)
toSend = SendBuffer.BUFFER_SIZE;
else
toSend = sendBuffer.BUFFER.Length - sendBuffer.sent;
socket.BeginSend(sendBuffer.BUFFER, sendBuffer.sent, toSend, SocketFlags.None, sendCallback, null);
}
}
catch (SocketException se)
{
switch (se.SocketErrorCode)
{
case SocketError.ConnectionAborted:
case SocketError.ConnectionReset:
if (Disconnected != null)
{
Disconnected(this);
return;
}
break;
}
}
catch (ObjectDisposedException ex)
{
}
catch (Exception ex)
{
Server.logger.Error(ex);
Disconnected(this);
}
}