/// <summary>
/// 当Socket上的发送或接收请求被完成时，调用此函数
/// </summary>
/// <param name="sender">激发事件的对象</param>
/// <param name="e">与发送或接收完成操作相关联的SocketAsyncEventArg对象</param>
private void OnIOCompleted(object sender, SocketAsyncEventArgs e)
{
// Determine which type of operation just completed and call the associated handler.
AsyncUserToken userToken = e.UserToken as AsyncUserToken;
lock (userToken)
{
switch (e.LastOperation)
{
case SocketAsyncOperation.Accept:
ProcessAccept(e);
break;
case SocketAsyncOperation.Receive:
ProcessReceive(e);
break;
//case SocketAsyncOperation.Send:
// ProcessSend(e);
// break;
}
}
}
/// <summary>
///接收完成时处理函数
/// </summary>
/// <param name="e">与接收完成操作相关联的SocketAsyncEventArg对象</param>
private void ProcessReceive(SocketAsyncEventArgs e)
{
AsyncUserToken userToken = e.UserToken as AsyncUserToken;
if (userToken.ReceiveEventArgs.BytesTransferred > 0 && userToken.ReceiveEventArgs.SocketError == SocketError.Success)
{
Socket sock = userToken.ConnectSocket;
//判断所有需接收的数据是否已经完成
if (sock.Available == 0)
{
//把收到的数据写入到缓存区里面
userToken.ReceiveBuffer.WriteBuffer(e.Buffer, e.Offset, e.BytesTransferred);
//TODO 处理数据
string info = Encoding.UTF8.GetString(e.Buffer, e.Offset, e.BytesTransferred);
//Log4Debug(String.Format("收到 {0} 数据为 {1}", sock.RemoteEndPoint.ToString(), info));
Send(userToken.SendEventArgs, e.Buffer, e.BytesTransferred);
}
//TODO:Cannot access a disposed object.Object name: 'System.Net.Sockets.Socket'.
try
{
if (!sock.ReceiveAsync(userToken.ReceiveEventArgs))//为接收下一段数据，投递接收请求，这个函数有可能同步完成，这时返回false，并且不会引发SocketAsyncEventArgs.Completed事件
{
//同步接收时处理接收完成事件
ProcessReceive(userToken.ReceiveEventArgs);
}
}
catch (ObjectDisposedException oex)
{
Console.WriteLine("Client was closed:" + oex.Message);
CloseClientSocket(userToken);
}
}
else
{
CloseClientSocket(userToken);
}
}
