[Qgis-developer] crash when accessing geometry from Python console

[Bernhard Ströbl]

Hi Matthias,

thank you, this works:
feat = iface.activeLayer().selectedFeatures()[0]
g = QgsGeometry(feat.geometry())

Bernhard

Am 25.06.2015 um 10:36 schrieb Matthias Kuhn:
> Hi,
>
> The savest option is to use
>
> QgsGeometry( feat.geometry() )
>
> This does currently work and will continue to work in the future once
> issue #777 is resolved,
>
> Cheers,
> Matthias
>
> On 06/25/2015 09:10 AM, Bernhard Ströbl wrote:
>> Hi Martin,
>>
>> I was not aware of this bug, thanks for pointing me towards it. As
>> posted previously I found a workaround but if I use
>> geometryAndOwnership() as proposed in #777 do I have to do anything like
>> g = None to destroy the geometry or will Python take care of that as
>> soon as my script has been finished?
>>
>> thank you for your help
>>
>> Bernhard
>>
>> Am 25.06.2015 um 09:00 schrieb Martin Dobias:
>>> Hi Bernhard
>>>
>>> that's a long standing unresolved issue with python bindings:
>>> http://hub.qgis.org/issues/777
>>>
>>> Regards
>>> Martin
>>>
>>>
>>>
>>> On Thu, Jun 25, 2015 at 2:43 PM, Bernhard Ströbl
>>> <bernhard.stroebl at jena.de> wrote:
>>>> Hi everybody,
>>>>
>>>> I try to do the following from the Python console:
>>>> g=iface.activeLayer().selectedFeatures()[0].geometry()
>>>> returns a QgsGeometry objekt but as soon as I want to do anything
>>>> with it
>>>> QGIS crashes (layer is a memory line layer but a PostGIS linestring
>>>> layer
>>>> behaves the same). Any request like
>>>> g.type()
>>>> g.length()
>>>> g.anything crashes QGIS
>>>> g.asPolyline() crash if the line has three vertices, with only two
>>>> vertices
>>>> it returns an empty array.
>>>>
>>>> My goal is not the Python console but a plugin; the plugin crashes,
>>>> too :-(
>>>>
>>>> tested with 2.8 on Win7 (64bit) and 2.8 & 2.9 on Ubuntu (64 bit) so it
>>>> should not be connected to the geometry overhaul I reckon.
>>>>
>>>> any help appreciated
>>>>
>>>> Bernhard
>>>>
>>>>
>>
>>
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>
>
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