[Qgis-user] PyQGIS script segfaults with 2.12

[François-Xavier Thomas]

Interesting. The current way of initializing PyQGIS is indeed a bit 
cumbersome, it took me a while to get it working! It would be great for 
3.0 to simplify the API.

I have an additional question : do you need a QApplication or just 
QCoreApplication? I'm using classes from QgsComposer and PyQt4.QtGui but 
do not display a GUI as the scripts are entirely automatic. They seem to 
work find with QCoreApplication ; are there any potential issues with 
doing this?

On 10/28/2015 10:40 AM, DelazJ wrote:
> Hi,
> It's discussed in this bug report : http://hub.qgis.org/issues/13494
>
> 2015-10-28 10:21 GMT+01:00 Luigi Pirelli <luipir at gmail.com
> <mailto:luipir at gmail.com>>:
>
>     I suppose QtGui.QApplication(sys.argv) would be before the
>     initQgis().... new Auth system need a QApplication to work.
>
>     I can't remember where there were a Larry Shaffer post regarding
>     this... I can't find it now. Please ttest and give confirmation in the
>     list.
>
>     regards
>     Luigi Pirelli
>
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>
>     On 28 October 2015 at 10:01, Alessandro Pasotti <apasotti at gmail.com
>     <mailto:apasotti at gmail.com>> wrote:
>      > 2015-10-28 9:57 GMT+01:00 François-Xavier Thomas
>      > <francois-xavier.thomas at airinov.fr
>     <mailto:francois-xavier.thomas at airinov.fr>>:
>      >>
>      >> Hello all,
>      >>
>      >> I've just upgraded to QGIS 2.12, in order to test some of my
>     scripts with
>      >> the new version, and they just happen to segfault immediately
>     when I call
>      >> QgsApplication.initQgis() in 2.12.
>      >>
>      >> I've checked the latest docs[1], and the 3 lines mentioned at the
>      >> beginning are enough to crash the Python interpreter:
>      >>
>      >>   from qgis.core import *
>      >>   QgsApplication.setPrefixPath("/usr", True)
>      >>   QgsApplication.initQgis()
>      >>
>      >
>      > Try to add QtGui.QApplication(sys.argv) such as:
>      >
>      > #Initialize QGIS
>      > core.QgsApplication.setPrefixPath("/usr", True)
>      > core.QgsApplication.initQgis()
>      > # On 2.10 crashes without!
>      > QtGui.QApplication(sys.argv)
>      >
>      >
>      > I thought it was fixed in 2.12 (and master).
>      >
>      >
>      > --
>      > Alessandro Pasotti
>      > w3: www.itopen.it <http://www.itopen.it>
>      >
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-- 
François-Xavier Thomas -- Ingénieur traitement des images

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