Importing XML to DOM tree in Qt

Question

I'm using Qt 4.7 on Mac OS X, and I have a QString containing a path to an XML file. I would like to import that file into a DOM tree and store the data as a member variable to a class. What is the best way to do this?

I've been looking at the QtXml documentation, but I can't find a clear way to convert from the QXml* classes to the QDom* classes.

Answer 1

I don't think you need to bother with the QXml* classes to traverse the DOM.

The QDomDocument class has a setContent() method that can take an open QFile.

There's a code sample in the "Details" section of the QDomDocument documentation.

QDomDocument doc("mydocument");
QFile file("mydocument.xml");
if (!file.open(QIODevice::ReadOnly))
    return;
if (!doc.setContent(&file)) {
    file.close();
    return;
}
file.close();

// print out the element names of all elements that are direct children
// of the outermost element.
QDomElement docElem = doc.documentElement();

QDomNode n = docElem.firstChild();
while(!n.isNull()) {
    QDomElement e = n.toElement(); // try to convert the node to an element.
    if(!e.isNull()) {
        cout << qPrintable(e.tagName()) << endl; // the node really is an element.
    }
    n = n.nextSibling();
}