I have a problem with reading qgs file by PyQGIS lib. I'm creating
python standalone stript which externally use PyQGIS from installed QGIS
desktop application. *The problem is that PyQGIS sometimes read qgs file
but WITHOUT READING LAYERS INSIDE*. I'm using Ubuntu 18.04 LTS, django,
python 3.6.9, QGIS 3.4.14-Madeira
PyQGIS helps me with reading and updating .qgs files. I'm always using
same start and ending code.
|fromqgis.core importQgsProject,QgsApplicationapp
=QgsApplication([],False)app.initQgis()app.exit()project
=QgsProject.instance()project.read("/path/to/file.qgs")(PyQGISoperations)project.write()app.exit()|
And... the problem is that this code works fine... but never know how
long, sometimes few days or few weeks but finally comes the moment when
this code stops working properly. It still reads .qgs file but without
layers inside, see groups but not layers. It should be impossible that
code works fine for long time but some day it stops.
PyQGIS unfortunately works that way. The only thing comes to my mind is
that the problem may be inside qgis desktop because PyQGIS is not common
library. I belongs and works only with qgis desktop. This program maybe
remember reading states or use multithreading with the way which i don't
understand.
Of course, the problem may be completely different but i really don't
have any more ideas how to change this code.
*Does anyone know how to fix it?*
Some logs from app which makes me wonder, maybe this will help.
|WARNING:QApplicationwas notcreated inthe main()thread.Loadinga file
that was saved withan older version of qgis (saved
in3.4.13-Madeira,loaded in3.4.14-Madeira).Problemsmay
occur.QObject::~QObject:Timerscannot be stopped fromanother thread
QObject::~QObject:Timerscannot be stopped fromanother thread
QObject::connect:Cannotqueue arguments of type 'QDomDocument'(Makesure
'QDomDocument'isregistered using qRegisterMetaType().)|
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