[QGIS-Developer] PyQGIS problem with QWebEngineView / QtDesigner Crash with QWebEngineView

[Nyall Dawson]

On Sat, 6 Feb 2021 at 18:28, Roberto Benet <rbenet71 at gmail.com> wrote:
>
> I have QGIS 3.16.3-Hannover installed with Qt 5.11.2 and 64-bit Windows 10. In two more computers I also have it installed in similar conditions.
>
>
>
> I am using the PyQGIS to stand-alone applications from QGIS and I think there is something that is not working well within PyQGIS because I cannot use the QWebEngineView and the QWebKit yes.

It's not a real answer to your question, but honestly I'd just stick
with QWebkit if it's working. QGIS itself makes heavy use of these
classes simply because QWebEngine is a very locked down API which
doesn't give us any of the features we need. If you stick with
QWebkit, things will work as expected because QGIS itself depends on
it!

Blame Qt upstream for their poor decision making here -- they really
dropped the ball with this whole QWebkit/webengine fiasco.

Nyall

>
>
>
> The symptoms I have are:
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>
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> 1.- If in the QtDesigner that is installed with QGIS, I add the QWebEngineView widget in the design, the program directly crash and stops running.
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>
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> 2.- If in a stand-alone application I start a QWebEngineView it gives me an error:
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>
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> Code:
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>     from qgis.PyQt.QtWidgets import QWidget, QApplication, QMainWindow, QFileDialog
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>     from PyQt5.QtWebEngineWidgets import QWebEngineView
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>
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>     import sys
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>
>
>     class temp (QWebEngineView):
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>         def __init __ (self):
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>             super () .__ init __ ()
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>
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>     if __name__ == '__main__':
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>         # We create the instance of the created class and show the window on the screen
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>         app = QApplication (sys.argv)
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>         win = temp ()
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>         win.show ()
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>         sys.exit (app.exec_ ())
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>
>
> and the error it gives is:
>
> ```
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> Qt WebEngine ICU data not found at C: /OSGeo4W64/apps/Qt5/resources.Trying parent directory ...
>
> Qt WebEngine ICU data not found at C: / OSGeo4W64 / apps / Qt5. Trying application directory ...
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> Qt WebEngine ICU data not found at C: / OSGeo4W64 / apps / Python37. Trying fallback directory ... The application MAY NOT work. Installed
>
> Qt WebEngine locales directory not found at location C: / OSGeo4W64 / apps / Qt5 / translationss \ qtwebengine_locales. Trying application directory ...
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> Qt WebEngine locales directory not found at location C: / OSGeo4W64 / apps / Python37 \ qtwebengine_locales. Trying fallback directory ... Translations MAY NOT not be correct.
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> [0205 / 214808.373: ERROR: icu_util.cc (179)] Invalid file descriptor to
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> ICU data received. [0205 / 214808.491: FATAL: icu_util.cc (311)] Check failed: result. Backtrace:
>
> ``
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> I have looked at this link:
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>
>
> https://issues.qgis.org/issues/18155
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> 3 years ago it seems that this error could not be solved ...
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>
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> Then with this other:
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> https://forum.qt.io/topic/70457/qt-5-7-qtwebenginewidgets-not-working-on-linux/3
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>
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> It seems that the following folders are missing, among others, that I do not have in my installation: resources, qtwebengine_locales, ...
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>
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> I have uninstalled the qwebengine with the OsGeo4W setup. And then I have reinstalled it.
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>
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> I have seen that QGis uses version 5.10.1, I have tried to install it through pip install, but it tells me that there is only the version from 5.12.
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>
>
> I think it must be that the QWebEngineView is not installed correctly with QGIS. Because if that works if I use it with the installation of python38 or python39.
>
>
> Libre de virus. www.avg.com
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