QGIS segfaults when using Qgsvectorlayer.select() inside geometryChanged handler

[qgib]

Author Name: Rafael Varela (@rpet)
Original Redmine Issue: 6547
Affected QGIS version: master
Redmine category:vectors

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I'm developing a python plugin in QGIS 1.9.0-master that makes QGIS
segfault when I call @Qgsvectorlayer.select()@ inside a @geometryChanged@
signal handler.

My code looks like this:

...

layer_A.geometryChanged.connect(self.onLineGeometryChange)

...

@pyqtSlot(int, QgsGeometry)
def onLineGeometryChange(self, featureId, geom ):
  ...
  layer_B.select( someRectangle, False )
  ...

QGIS only segfaults when using the node tool of @mDigitizeToolBar@. It does not crash when I use the move feature tool.

Looking at the source code in the git repository I found out that most of the @Qgsvectorlayer::select()@ functionality resides in the @select()@ functions of the data provider, so I decided to write the layers to disk and switch the layer data provider from "memory" to "ogr".

Unfortunately, the problem still persists.

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• FixSelect.tar.gz (Daniel Vaz)

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• priority_id was changed from Normal to High

[qgib]

Author Name: Daniel Vaz (Daniel Vaz)

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I create a test plugin that do nothing, except for connect the same signal and try to select something in the active layer. The plugin works fine.

I am used a shape layer and node tool (from mDigitizeToolBar) and move tool, too.

Nothing crash.

Are you sure about the existence of layer_B when some feature of layer_A was changed?

I look forward to hear you soon.

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• 5999 was configured as FixSelect.tar.gz

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• FixSelect.tar.gz (Daniel Vaz)

[qgib]

Author Name: Daniel Vaz (Daniel Vaz)

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Steps to use the plugin

1 - Open Qgis
2 - Insert a existent shape layer
3 - Select the layer
4 - Run the plugin
5 - Click in button "1" that connect signal (geometryChanged) to slot
6 - Go to edit mode
7 - Use node tool or move tool in selected layer

Works fine.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Vectors

[qgib]

Author Name: Rafael Varela (@rpet)

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Daniel Vaz wrote:

I create a test plugin that do nothing, except for connect the same signal and try to select something in the active layer. The plugin works fine.

I am used a shape layer and node tool (from mDigitizeToolBar) and move tool, too.

Nothing crash.

Are you sure about the existence of layer_B when some feature of layer_A was changed?

Well, I'm pretty sure that @layer_B@ existed when I did my tests, but I will check it again with the current "master". I still have to upgrade my installation to run your plugin.

Bear in mind that this report is 9 months old and things may have changed a lot from the code revision I used (probably, fb7c596 from OSGeo4W package 1.9.0-227)

Thank you for your interest in this issue.

[qgib]

Author Name: Daniel Vaz (Daniel Vaz)

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You are right.

A long time has passed since you post it. Probably the SIP was broken when you report the bug.

Thanks

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Matthias Kuhn (@m-kuhn)

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Closed due to lack of feedback.
Please reopen if required and add any data/info that may have been requested.

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• status_id was changed from Feedback to Closed