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CSocket在发送时未阻塞

sockets mfc c++

Mehran ShankarSangoli · 技术社区 · 15 年前

调用此函数为新线程中的每个客户机提供服务。在consume函数中,这些归档文件被读取和写入,但函数在客户端完成读取所有响应之前返回,因此套接字超出范围并关闭,从而在客户端中创建异常。我假设CArchive上的任何写操作都应该阻塞,直到客户端读取为止。我在这里做了一个错误的假设吗?

谢谢

UINT CNetServer::serveClient(LPVOID p)
{
    serveClientParams* params = reinterpret_cast<serveClientParams*>(p);
    try
        {
            AfxSocketInit();
            CSocket clientSocket;
            clientSocket.Attach(params->ClientSocket);
            CSocketFile file(&clientSocket);
            CArchive arIn (&file, CArchive::load);
            CArchive arOut(&file, CArchive::store);
        params->ServerInstance->Consumer.Consume(arIn, arOut);

            arOut.Flush(); 
            file.Flush();
                    //SleepEx(1000,true); works fine is I wait till the data is sent.
        }
        catch(int ex)
        {
            CMisc::LogWriteWarning(ex, GetLastError(), "Listen Loop Communication");
        }
        catch(CException* ex)
        {
            char buffer[1024];
            ex->GetErrorMessage(buffer, sizeof(buffer));
            CMisc::LogWriteError(buffer, SOCKET_COMUNICATION_FAILED); 
        }
        catch(...)
        {
            CMisc::LogWriteWarning(0, GetLastError(), "abnormal communication termination.");
        }
        delete params;
        return 0;
}

2 回复 | 直到 15 年前

Mehran ShankarSangoli 15 年前

我找到了解决方案,为了在不丢失任何未交换数据的情况下关闭连接,您基本上应该使用SO_LINGER选项,这是一个非常长的故事,您可以在中看到详细信息 this article

最后,这里是新代码

   UINT CNetServer::serveClient(LPVOID p)
{
    serveClientParams* params = reinterpret_cast<serveClientParams*>(p);
    try
        {
            AfxSocketInit();
            CSocket clientSocket;
            clientSocket.Attach(params->ClientSocket);

            struct linger linger;
            linger.l_linger = 9;
            linger.l_onoff = 128;
            int fls = 0;

            int i = clientSocket.SetSockOpt(SO_LINGER, &linger, sizeof(linger));
            i = clientSocket.SetSockOpt(SO_DONTLINGER, &fls, sizeof(fls));

            CSocketFile file(&clientSocket);
            CArchive arIn (&file, CArchive::load);
            CArchive arOut(&file, CArchive::store);
            params->ServerInstance->Consumer.Consume(arIn, arOut);

            arOut.Flush(); 
            //BOOL b = clientSocket.ShutDown(SD_BOTH);
        }
        catch(int ex)
        {
            CMisc::LogWriteWarning(ex, GetLastError(), "Listen Loop Communication");
        }
        catch(CException* ex)
        {
            char buffer[1024];
            ex->GetErrorMessage(buffer, sizeof(buffer));
            CMisc::LogWriteError(buffer, SOCKET_COMUNICATION_FAILED); 
        }
        catch(...)
        {
            CMisc::LogWriteWarning(0, GetLastError(), "abnormal communication termination.");
        }
        delete params;
        return 0;
}

Vadakkumpadath 15 年前

不允许 clientSocket

1. UINT CNetServer::serveClient(LPVOID p)
   {
       :
       CSocket* clientSocket = new CSocket;
       :
   }

2. CSocket clientSocket; // Global scope

   UINT CNetServer::serveClient(LPVOID p)
   {
       :
   }