/// <summary>
/// 此方法在异步发送操作完成时调用。
/// 该方法在套接字上发出另一个receive，以读取从客户端发送的任何附加数据
/// </summary>
/// <param name="e"></param>
private void ProcessSend(SocketAsyncEventArgs e)
{
if (e.SocketError == SocketError.Success)
{
// 已将数据回显到客户端
AsyncUserToken token = (AsyncUserToken)e.UserToken;
// 读取从客户端发送的下一个数据块
bool willRaiseEvent = token.Socket.ReceiveAsync(e);
if (!willRaiseEvent)
{
ProcessReceive(e);
}
}
else
{
CloseClientSocket(e);
}
}
/// <summary>
///
/// </summary>
/// <param name="e"></param>
private void CloseClientSocket(SocketAsyncEventArgs e)
{
AsyncUserToken token = e.UserToken as AsyncUserToken;
// 关闭与客户端关联的套接字
try
{
token.Socket.Shutdown(SocketShutdown.Send);
}
//如果客户端进程已关闭，则引发
catch (Exception)
{
}
token.Socket.Close();
// 递减计数器以跟踪连接到服务器的客户端总数
Interlocked.Decrement(ref m_numConnectedSockets);
// 释放SocketAsyncEventArg，以便其他客户端可以重用它们
m_readWritePool.Push(e);
m_maxNumberAcceptedClients.Release();
Console.WriteLine("A client has been disconnected from the server. There are {0} clients connected to the server", m_numConnectedSockets);
}
/// <summary>
/// 此方法在异步接收操作完成时调用
/// 如果远程主机关闭了连接，则套接字将关闭。
/// 如果接收到数据，则将数据回显到客户端。
/// </summary>
/// <param name="e"></param>
private void ProcessReceive(SocketAsyncEventArgs e)
{
// 检查远程主机是否关闭了连接
AsyncUserToken token = (AsyncUserToken)e.UserToken;
if (e.BytesTransferred > 0 && e.SocketError == SocketError.Success)
{
//增加服务器接收的总字节数
Interlocked.Add(ref m_totalBytesRead, e.BytesTransferred);
Console.WriteLine("The server has read a total of {0} bytes", m_totalBytesRead);
//将接收到的数据回显到客户端
e.SetBuffer(e.Offset, e.BytesTransferred);
bool willRaiseEvent = token.Socket.SendAsync(e);
if (!willRaiseEvent)
{
ProcessSend(e);
}
}
else
{
CloseClientSocket(e);
}
}
