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QXmlStreamReader, readElementText method

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  • A Offline
    A Offline
    Aymeric_Qt
    wrote on last edited by
    #1

    Hello everyone,
    This question might be more related to pure C++ than to Qt.

    While using QXmlStreamReader I've ran into a strange behavior.
    Here is the code I had:

    QXmlStreamReader reader;
    reader.addData(data);
    
    while(reader.readNextStartElement())
        {
            if (reader.name() == "api_url")
            {
                qDebug() << reader.readElementText();
                //m_apiUrl is a QString private member variable
                m_apiUrl = reader.readElementText();
                qDebug() << "m_apiUrl: " << m_apiUrl;
            }
        }
    

    In this case the m_apiUrl variable value was set to an empty string.
    But as soon as I've deleted the first qDebug statement m_apiUrl was set with a correct value.

    So I would like to know what happened and why.

    Thank you for reading.

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    0
    • Christian EhrlicherC Offline
      Christian EhrlicherC Offline
      Christian Ehrlicher
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @Aymeric_Qt said in QXmlStreamReader, readElementText method:

      So I would like to know what happened and why.

      See the documentation - you read the element, so it's already read and the next call to readElementText() will not return anything.

      Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
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      3
      • A Offline
        A Offline
        Aymeric_Qt
        wrote on last edited by
        #3

        @Christian-Ehrlicher I missed that when I've read the documentation. Thank you!

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