Bug report #19560

Qgis crashes when QgsExtentGroupBox.setOriginalExtent() is called

Added by Wondimagegn Beshah over 6 years ago. Updated about 6 years ago.

Status:Closed
Priority:High
Assignee:-
Category:GUI
Affected QGIS version:3.2.1 Regression?:Yes
Operating System:Windows 10 Easy fix?:No
Pull Request or Patch supplied:No Resolution:invalid
Crashes QGIS or corrupts data:Yes Copied to github as #:27387

Description

Below is the relevant code. I am using QgsProjectionSelectionWidget to get the CRS.

        canvas_extent = self.canvas.extent()

        transformer = QgsCoordinateTransform(
            self.canvas.mapSettings().destinationCrs(),
            self.input_projection_cbo.crs(),
            QgsProject.instance()
        )

        transformer.setDestinationCrs(
            self.input_projection_cbo.crs()
        )
        transformed_extent = transformer.transform(canvas_extent)

        self.extent_box.setOriginalExtent(
            transformed_extent,
            QgsCoordinateReferenceSystem(
                self.input_projection_cbo.crs().authid()
            )
        )

        self.extent_box.setOutputCrs(
            QgsCoordinateReferenceSystem(
                self.input_projection_cbo.crs().authid()
            )
        )
        self.extent_box.setOutputExtentFromOriginal()
        self.extent_box.setCurrentExtent(
            transformed_extent,
            QgsCoordinateReferenceSystem(
                self.input_projection_cbo.crs().authid()
            )

        )

Below is the entire report. 

h2. User Feedback

h2. Report Details

*Crash ID*: 8e827b9e58264385e7a945fbe0ac6df5b4daf9a5

*Stack Trace*
<pre>
QgsExtentGroupBox::setOriginalExtent :
PyInit__gui :
PyCFunction_FastCallDict :
PyObject_GenericGetAttr :
PyEval_EvalFrameDefault :
PyFunction_FastCallDict :
PyObject_CallFunctionObjArgs :
PyObject_Call :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
QMetaObject::activate :
QGroupBox::childEvent :
QGroupBox::mouseReleaseEvent :
QgsPresetSchemeColorRamp::clone :
QWidget::event :
QGroupBox::event :
QgsPresetSchemeColorRamp::clone :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QApplicationPrivate::sendMouseEvent :
QSizePolicy::QSizePolicy :
QSizePolicy::QSizePolicy :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
CallWindowProcW :
DispatchMessageW :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :
</pre>

*QGIS Info*
QGIS Version: 3.2.1-Bonn
QGIS code revision: commit:1edf372fb8
Compiled against Qt: 5.9.2
Running against Qt: 5.9.2
Compiled against GDAL: 2.2.4
Running against GDAL: 2.2.4

*System Info*
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.17134

History

#1 Updated by Wondimagegn Beshah over 6 years ago

The crash also happens on QGIS 3.3 master.

#2 Updated by Nyall Dawson about 6 years ago

  • Status changed from Open to Feedback

I can't reproduce. Can you share a complete self-contained code sample?

#3 Updated by Wondimagegn Beshah about 6 years ago

I found out that the problem is not on the above code. The crash is most likely related to me hiding the extent groupbox buttons using Qt methods. I had to delete them because hiding did not work as they still reappeared. The code below used to work on QGIS 2.18 but was not working on QGIS 3.2 and later. Anyways I decided not to hide it due to the crash.

        for button in self.extent_box.findChildren(QPushButton):
            button.setHidden(True)
            button.parent().setHidden(True)
            button.deleteLater()
            button.parent().deleteLater()

#4 Updated by Nyall Dawson about 6 years ago

  • Resolution set to invalid
  • Status changed from Feedback to Closed

Yes - that kind of scripting is always going to be very fragile, and while it may work in certain versions is not part of the stable API contract.

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