QDom & xhtml

**Potch** · 19th February 2010, 00:21

Hi,

This is my first experience with both DOM and xml. My aim is to use QDom to parse xhtml data.
I do not understand why the QDomNodeList contains 0 elements (according to gdb).

Qt Code:

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<html>
  <body>
    <p>
      <report id="1">dd:</report>
    </p>
    <p>
      <report id="2">MM:</report>
    </p>
    <p>
      <report id="3">yyyy:</report>
     </p>
  </body>
</html>

<html>
  <body>
    <p>
      <report id="1">dd:</report>
    </p>
    <p>
      <report id="2">MM:</report>
    </p>
    <p>
      <report id="3">yyyy:</report>
     </p>
  </body>
</html>

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Qt Code:

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QDomDocument doc;
    QFile file("template.xhtml");
    if (!file.open(QIODevice::ReadOnly))
        return;
    if (!doc.setContent(&file)) {
        file.close();
        return;
    }
    file.close();
 
    QDomNodeList nodeList = doc.elementsByTagName("report");

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

    QDomNodeList nodeList = doc.elementsByTagName("report");

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How can I populate such list ?
any clue ?

thanks in advance

**prof.ebral** · 19th February 2010, 00:55

I've worked with a Dom XML structure in my software and it looks to be the same. I am using Python so my answer might be incorrect, but I think you need to find the root of the document. I'll show you a snippet of code.

Qt Code:

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tree = xml.parseXml(txt)._get_documentElement()
ini.close()
node_list = tree.getElementsByTagName("MetaServerBaseURL")

tree = xml.parseXml(txt)._get_documentElement()
ini.close()
node_list = tree.getElementsByTagName("MetaServerBaseURL")

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Like I said, it's python, not pure Qt, but it definitely looks similar.

I should mention I don't like the DOM. Python has Element Tree and that is a much cleaner and more efficient way of finding data in XML files. I am a Qt Newbie, so I don't know if they have something like that in the language. If they do I would recommend moving away from the DOM.

**Lykurg** · 19th February 2010, 08:51

Originally Posted by Potch

I do not understand why the QDomNodeList contains 0 elements (according to gdb).

Then you a) don't understand how to use gdb correctly or b) you open the wrong file.

Qt Code:

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QString str = "<html><body><p><report id=\"1\">dd:</report></p>"
                 "<p><report id=\"2\">MM:</report></p>"
                 "<p><report id=\"3\">yyyy:</report></p></body></html>";
    QDomDocument doc;
    doc.setContent(str);
    QDomNodeList nodeList = doc.elementsByTagName("report");
    qWarning() << nodeList.count(); // returns 3

QString str = "<html><body><p><report id=\"1\">dd:</report></p>"
                 "<p><report id=\"2\">MM:</report></p>"
                 "<p><report id=\"3\">yyyy:</report></p></body></html>";
    QDomDocument doc;
    doc.setContent(str);
    QDomNodeList nodeList = doc.elementsByTagName("report");
    qWarning() << nodeList.count(); // returns 3

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**Potch** · 19th February 2010, 23:41

Ok for a)
: /

THanks !

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