Keyword in

[Nio74]

I can't understund how keyword work "in" can you explain it me?

void ServerStuff::readClient()
{
   // QTcpSocket *clientSocket = (QTcpSocket*)sender();
    QTcpSocket *clientSocket = static_cast<QTcpSocket*>(sender());

**//do you need to pass the contents in clientSocket  to QdataStream?**

    QDataStream in(clientSocket);
    //in.setVersion(QDataStream::Qt_5_10);
    for (;;)
    {
        if (!m_nNextBlockSize)
        {
            if (clientSocket->bytesAvailable() < sizeof(quint16)) { break; }
            in >> m_nNextBlockSize;
        }

        if (clientSocket->bytesAvailable() < m_nNextBlockSize) { break; }
        QString str;
        in >> str;

        emit gotNewMesssage(str);

        m_nNextBlockSize = 0;

        if (sendToClient(clientSocket, QString("Reply: received [%1]").arg(str)) == -1)
        {
            qDebug() << "Some error occured";
        }
    }
}

[Kent-Dorfman]

in isn't a keyword. it is an object of type QDataStream. In the context you are using it it is a stream object to read from a socket using the streams operators.

[Nio74]

@Kent-Dorfman said in Keyword in:

in isn't a keyword. it is an object of type QDataStream. In the context you are using it it is a stream object to read from a socket using the streams operators.

thanks, in this way is passed to the object "in" as an argument (clientSocket)?

[jsulm]

@Nio74 clientSocket is passed as parameter/argument to "in", so "in" will read from clientSocket

[Nio74]

tanks everyone,I think that I have understund