.cpp

void Dialog::sendTextToServer(QString text){

    QByteArray block;
    QDataStream out(&block,QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_5_3);
    qDebug() << "texto: " + text;
    out << (quint32)0 << text;

    out.device()->seek(0);
    out << (quint32)(block.size() - sizeof(quint32));

    qint64 x = 0;
    while(x < block.size()){
        qint64 y = tcpSocket->write(block);
        x+=y;
        qDebug() << x;
    }
    qDebug() << "-----";

}