Unable to convert a C++ 'QWebEngineFindTextResult' instance to a Python object

Florian Bruhin <[email protected]> Thu, 7 May 2020 16:25:47 +0200

Newsgroups	gmane.comp.python.pyqt-pykde
Message-ID	<[email protected]>

Hey,

I got a report from someone using:

- Qt 5.14.1 (both QT_VERSION_STR and qVersion())
- PyQt 5.14.1
- sip 4.19.21

- QtWebEngine 5.14.1
- PyQtWebEngine 5.14.0 (note the .0)

- Python 3.6.10
- Gentoo Linux

Where emitting the QWebEnginePage.findTextFinished signal (added in Qt 5.14)
results in:

  TypeError: unable to convert a C++ 'QWebEngineFindTextResult' instance to a
  Python object

In a similar vein, trying to import it via:

  python3 -c "from PyQt5.QtWebEngineCore import QWebEngineFindTextResult"

results in:

  ImportError: cannot import name 'QWebEngineFindTextResult'

Test script:

--------------------------------------------------

from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QUrl, QTimer, pyqtSlot

app = QApplication([])

view = QWebEngineView()
view.load(QUrl('https://qutebrowser.org'))
view.show()

# @pyqtSlot('QWebEngineFindTextResult')
def slot(result):
    print(result.numberOfMatches())
    app.quit()

view.page().findTextFinished.connect(slot)
QTimer.singleShot(5000, lambda: view.findText("qutebrowser"))

app.exec_()

--------------------------------------------------

The crash happens after 5s, after findText got called. The pyqtSlot decorator
doesn't change anything.

I can't reproduce, and also don't know about any other people who have the same
issue...

Any idea what's going on there? Is their sip version too old or something?
Was there a bug in QtWebEngine 5.14.0 which was fixed in .1? I don't understand
what's happening, because both the findTextFinished signal and the
QWebEngineFindTextResult class is guarded by "%If (QtWebEngine_5_14_0 -)", so
surely both should be available?

Florian

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