[Qt-interest] Extracting child node values with QXmlItem as a QXmlQuery focus

[Jan Królikowski]

Hi,

I've been trying to fetch node text values from this XML file:

<!DOCTYPE structure>
<data>
 <x>
  <id>1</id>
  <nam>tytuł</nam>
  <tab>21</tab>
  <ind>5</ind>
  <pre>TY</pre>
  <khw>C.TY</khw>
 </x>
 <x>
  <id>2</id>
  <nam>autor</nam>
  <tab>21</tab>
  <ind>5</ind>
  <pre>FO</pre>
  <khw>C.FO</khw>
 </x>
 <x>
  <id>3</id>
  <nam>hasło korporatywne</nam>
  <tab>21</tab>
  <ind>5</ind>
  <pre>FN</pre>
  <khw>C.FN</khw>
 </x>
</data>

What I want to do is to fetch every <x> node and it's children and convert
it to QMap. I have no trouble with fetching single <x> element, but when it
comes to fetch children items by setting result of QXmlQuery as a focus, the
QString that i evaluate the child node query is empty. I use this piece of
code:

    QXmlResultItems results;
    QFile structure("./structure.xml"); // xml file, as described earlier
    structure.open(QFile::ReadOnly);

    QXmlQuery query;
    query.setFocus(&structure);
    query.setQuery("data/x");
    query.evaluateTo(&results);

    QXmlItem next = results.next();
    while(!next.isNull()) {
        qDebug() << next.toNodeModelIndex().stringValue(); // everything's
fine. It prints contents of <x>'s child nodes
        QXmlQuery childQuery;
        QString r;
        childQuery.setFocus(next);
        childQuery.setQuery("./nam/text()"); // already tested:
"/nam/text()", "/nam/string()", "x/nam/string()", "data/x/nam/string()"
etc... still no luck.
        childQuery.evaluateTo(&r);
        qDebug() << r; // prints \n but it should print content of <nam>
node.

        next = results.next();
    }

Software I use: Qt 4.7.2 SDK directly from Qt website, QtCreator 2.3.1 on
Windows and Linux (without any difference in this particular case, results
are the same). I want to be sure that's the problem of my lack of knowledge,
rather than software bug, please help

Jan Królikowski
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