QXmlQuery::setQuery() cannot query when I pass source code to its parameter

Question

Qt's QXmlQuery::setQuery has a polymorphism, just like:

void QXmlQuery::setQuery(const QString &sourceCode, const QUrl &documentURI = QUrl())

However, when I pass a HTML source code to the parameter sourceCode, and try to evaluate, I can only get an error:

Error XPST0003 in file:///, at line 1, column 2: syntax error, unexpected unknown keyword, expecting QName or NCName

Here is an example:

QString srcHTML = "<html>......</html>";    // An HTML forked from any website

QXmlQuery query;
query.setQuery(srcHTML, QUrl("/html/body/"));

QString r;
query.evaluateTo(&r);

qDebug() << r;

Then an error message shows:

Error XPST0003 in file:///html/body/, at line 1, column 2: syntax error, unexpected unknown keyword, expecting QName or NCName ""

That's strange, even though I've feeded QXmlQuery::setQuery() a valid HTML source!

Maybe, it is about the second parameter, see doc.qt.io/qt-5/qxmlquery.html#details . Check if QUrl is valid. — sirop
– sirop, Commented Apr 7, 2019 at 9:44
@sirop The example in my code comes from this: stackoverflow.com/a/18677398/10865463 — Akura Ryu
– Akura Ryu, Commented Apr 7, 2019 at 10:34
Then could you explain:query.setQuery("doc('index.html')/html/body/p[1]");? — sirop
– sirop, Commented Apr 7, 2019 at 10:59

Martin Honnen · Accepted Answer · 2019-04-07 10:35:10Z

1

Use query.setFocus(srcHTML); query.setQuery("/html/body");. Note that the input string to setFocus needs to be well-formed XML which HTML often not is.

answered Apr 7, 2019 at 10:35

Martin Honnen

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1 Comment

Akura Ryu Over a year ago

So does it. Maybe I have to find another way to parse HTML.

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