QSettings with xml format

static bool readXmlFile(QIODevice &device, QSettings::SettingsMap &map)
{
    qDebug()<< "read";
    QXmlStreamReader reader(&device);
    QString key;
    while(!reader.atEnd())
    {
        if( reader.isStartElement() && reader.tokenString() != "Settings")
        {
            if( reader.text().isNull() )
            {
                // key = Settings
                if(key.isEmpty())
                    key = reader.tokenString();
                // key = Settings/Intervall
                else key += "/" + reader.tokenString();
            }
            else map.insert(key, reader.text().data());
        }
    }

    return true;
}

static bool writeXmlFile(QIODevice &device, const QSettings::SettingsMap &map)
{
    qDebug()<< "write";
    QXmlStreamWriter writer(&device);
    writer.writeStartDocument("1.0");
    writer.writeStartElement("Settings");
    foreach(QString key, map.keys())
    {
        foreach(QString elementKey, key.split("/"))
        {
            writer.writeStartElement(elementKey);
        }
        writer.writeCDATA(map.value(key).toString());
        writer.writeEndElement();
    }
    writer.writeEndElement();
    writer.writeEndDocument();

    return true;
}



int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //a.setApplicationName("SPC");
    //a.setOrganizationName("EUP");

    const QSettings::Format XmlFormat = QSettings::registerFormat("xml", readXmlFile, writeXmlFile);
    QSettings::setPath(XmlFormat, QSettings::UserScope, a.applicationFilePath());
    QSettings::setDefaultFormat(XmlFormat);

    QSettings setting(XmlFormat, QSettings::UserScope, "EUP");
    setting.setValue("xmlFormat", 2);