QTcpSocket在每

Question

我已简单服务器的连接线。当你呼叫功能receiveString，它将失败。但是当你执行相同的码在运行(),它成功。需要的是什么功能receiveString工作？

我都试过

bool TestServerThread::receiveString(QTcpSocket& sock, QString& str)
bool TestServerThread::receiveString(QTcpSocket* sock, QString& str)

实际代码:

TestServerThread::TestServerThread(int socketDescriptor, QObject *parent) : QThread(parent), socketDescriptor(socketDescriptor)
{
}


bool TestServerThread::receiveString(QTcpSocket& sock, QString& str)
{
    if(sock.isValid())
    {
        if(!sock.waitForReadyRead(30))
        {
            qWarning() << "fail"; // fails here
            return false;
        }
        QByteArray buf = sock.readAll();
        str = buf;
    }
}

void TestServerThread::run()
{
    QTcpSocket sock;
    if (!sock.setSocketDescriptor(socketDescriptor)) {
        emit error(sock.error());
        return;
    }

    bool ok = true;
    while(ok)
    {
        QString str;
        //if(ok) ok = receiveString(sock, str);

        if(!sock.waitForReadyRead(30))
        {
            qWarning() << "false";
        }
        QByteArray buf = sock.readAll(); // same routine succeeds
        str = buf;
        qWarning() << str;

        qWarning() << "Received: " << str;
        if(ok) ok = sendString(sock, "kaka");
    }
    sock.disconnectFromHost();
    sock.waitForDisconnected();
}

Answer 1

无论你的代码毁进程堆栈，或你的超时值是不够的。

Answer 2

回报是什么价值或 QTcpSocket::errorString()?

//...
if(!sock.waitForReadyRead(30))
{
    qWarning() << "fails " << sock.errorString(); // fails here
    emit error(sock.error());
    return false;
}
//...

请注意，在运行，你总是读取的数据上插座，甚至如果 QTcpSocket::waitForReadyRead 退回错误的。
你确定你没有得到同样的错误 run 如同在 receiveString, 但阅读成功，是因为你忽略了这个错误？

是 run 仍然成功如果你用这个代码:

bool ok = true;
while(ok)
{
    QString str;
    //if(ok) ok = receiveString(sock, str);

    if(sock.waitForReadyRead(30))
    {
        QByteArray buf = sock.readAll(); // same routine succeeds
        str = buf;
        qWarning() << str;
        qWarning() << "Received: " << str;
        if(ok) 
        {
            ok = sendString(sock, "kaka");
        }
    }
    else
    {
         qWarning() << "fails " << sock.errorString();
         ok = false;
    }
}