Hi Mélanie,
Thanks for the script, I was able to reproduce the segmentation fault
with a dummy gpkg I made.
After some investigations, it seems that the symbol named "style_layer"
used in
1. the addSymbol() method for the first layer
2. & 3. the QgsRendererCategory() constructor for the second and
third layer
is None (nullptr -> hence the segfault).
If I add the following
if style_layer is None:
style_layer =
QgsSymbol.defaultSymbol(Layer_Pressure_Center.geometryType())
just before using style_layer as a safe check (for each layer of course)
everything works fine.
Maybe it's simply because I don't have these symbols pre-configured, but
it's worth the check on your side.
Also, I encapsulated the code like this, which prevents another segfault
to occur due to local/global scope stuff I think:
---
all imports
def main():
the main code
if__name__ == '__main__':
set prefix path
create qgs application
append plugins path to sys.path and import processing stuff
main()
qgs.exitQgis()
---
Regards,
Jacky
Le 28/10/2022 à 17:10, Mélanie Dol via QGIS-Developer a écrit :
Hi Jacky,
Yes of course. Please find attached my script.
Regards,
Mélanie
On 10/28/22 4:55 PM, Jacky Volpes via QGIS-Developer wrote:
Hi Mélanie,
Have you initialized your standalone script as shown in
https://docs.qgis.org/3.22/en/docs/pyqgis_developer_cookbook/intro.html#using-pyqgis-in-standalone-scripts
?
Best regards,
Jacky
Le 28/10/2022 à 16:40, Mélanie Dol via QGIS-Developer a écrit :
Hi Andrea,
Thank you. I've updated with QGIS 3.26 Buenos Aires. The warning
message have disappeared. Unfortunately, the script still generates
a segmentation fault.
Best regards,
Mélanie Dol
On 10/28/22 11:47 AM, Andrea Giudiceandrea via QGIS-Developer wrote:
Il 27/10/2022 16:34, Mélanie Dol via QGIS-Developer ha scritto:
/usr/share/qgis/python/plugins/processing/algs/grass7/Grass7Utils.py:191:
SyntaxWarning: "is" with a literal. Did you mean "=="?
if path is '':
Hi Mélanie,
while I don't know why that script generates a segmentation fault,
It seems you are using QGIS 3.10 which is a three years old
version. The QGIS repository for Ubuntu 20.04 currently offers the
latest available QGIS LTR 3.22.12.
Best regards.
Andrea Giudiceandrea
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Jacky Volpes
Ingénieur SIG - Oslandia
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Ingénieur SIG - Oslandia
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