QDomDocument::setContent() returns true despite XML being invalid

[Jits]

Good day!

Attempting to parse XML to DOM from string input using QDomDocument::setContent(). However, setContent() returns true regardless of the input and it's driving me nuts.

Text is entered into QTextEdit GUI and then (theoretically) converted to XML in the following function:

void Class::getXML()
{
    domDoc->clear();
    //Converts text edit content to HTML and parses to DOM doc
    if(!domDoc->setContent(textEdit->toHtml()))    {
        QMessageBox::information(this,"Error","XML invalid");
    } else  {
        QMessageBox::information(this,"Success",domDoc->toString(4));   //xxxTESTINGxxx
    }
}

void Class::getXML()
{
    domDoc->clear();
    //Converts text edit content to HTML and parses to DOM doc
    if(!domDoc->setContent(textEdit->toHtml()))    {
        QMessageBox::information(this,"Error","XML invalid");
    } else  {
        QMessageBox::information(this,"Success",domDoc->toString(4));   //xxxTESTINGxxx
    }
}

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I understand setContent() is supposed to validate the input? Any ideas?

Thanks!

[Lykurg]

I am not sure, if only a CDATA like in you case is valid XML... Nevertheless I guess you expect a certain XML string, so have a look at XML Schema Validation Example in the docs, which allows you a more specific test.

[hobbyist]

Afaik, QTextEdit::toHtml() always returns valid html (see qDebug() << textEdit->toHtml() for the actual content).

Perhaps domDoc->setContent(textEdit->toPlainText()) is what you are looking for?

[Jits]

I am not sure, if only a CDATA like in you case is valid XML... Nevertheless I guess you expect a certain XML string, so have a look at XML Schema Validation Example in the docs, which allows you a more specific test.

Thanks for the reply! My XML knowledge is rudimentary at best, but I believe there are many different schemas we'll be using (this little app is for in-house testing) so I'm starting to wonder if I should just forget about the validation and hope that the users will check their XML syntax as I'm really struggling to make this work.

What I don't understand is that the parsing to DOM doesn't return any errors...ever.Shouldn't there be complaints if there are, e.g. missing brackets?

[Jits]

Afaik, QTextEdit::toHtml() always returns valid html (see qDebug() << textEdit->toHtml() for the actual content).

Perhaps domDoc->setContent(textEdit->toPlainText()) is what you are looking for?

Doesn't seem to do any validation either...brackets or no brackets, it's happy!

[hobbyist]

Perhaps you could give an example of your input?

As an example, I get

"tag mismatch" at line: 4 col: 10

"tag mismatch" at line: 4 col: 10

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when I run this:

#include <QtGui>
#include <QtXml>
 
int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
 
  QTextEdit textEdit;
  QDomDocument domDoc;
  QString error;
  int line, col;
 
  textEdit.append("<stuff>");
  textEdit.append("  <testing>");
  textEdit.append("    blaa... ");
  textEdit.append("  </tstng>");
  textEdit.append("</stuff>");
 
  textEdit.show();
 
  if(!domDoc.setContent(textEdit.toPlainText(), &error, &line, &col))
    qDebug() << error << "at line: " << line << "col: " << col;
 
  return app.exec();
}

#include <QtGui>
#include <QtXml>

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);

  QTextEdit textEdit;
  QDomDocument domDoc;
  QString error;
  int line, col;

  textEdit.append("<stuff>");
  textEdit.append("  <testing>");
  textEdit.append("    blaa... ");
  textEdit.append("  </tstng>");
  textEdit.append("</stuff>");

  textEdit.show();

  if(!domDoc.setContent(textEdit.toPlainText(), &error, &line, &col))
    qDebug() << error << "at line: " << line << "col: " << col;

  return app.exec();
}

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[edit] Sorry, misunderstood the question, which was about schemas, not parsing.

[Jits]

[edit] Sorry, misunderstood the question, which was about schemas, not parsing.

You won't believe me...but your code helped me figure this out. Seeing that yours produced the correct results, I finally determined that my TEST function was wrong! All this time wasted because I never considered that angle! Feels like such an idiot...

Thank you both for the input!