[Qgis-developer] Using Processing in standalone PYQGIS scripts

[Etienne Trimaille]

> AttributeError: class Processing has no attribute 'Initialize'

Did you try : 'initialize' ?
According to
https://github.com/qgis/QGIS/blob/master/python/plugins/processing/core/Processing.py#L146

2016-09-30 20:51 GMT+07:00 Eric Goddard <egoddard1010 at gmail.com>:

> Thanks Victor, I had tried that within the QGIS Python console and got
> the same error about the number of arguments. When I drop the OUTPUT
> parameter it runs, so now my call looks like this:
>
> processing.runalg('qgis:selectbylocation', "photos", "boundaries",
> u'intersect', 0.0, 0)
>
> If I run just this line in the interpreter, it outputs:  {'OUTPUT':
> u'/home/eric/Development/csi_data_collection/scripts/photos.gpkg'}
>
> However, it doesn't select any of the points within the selected
> polygon boundary. If I run the tool from the Processing Toolbox, it
> does select the points within the boundary. When running that tool
> from python should it use selected features in the intersection layer?
> I tried it with no boundaries selected and it still didn't select
> anything.
>
> Thanks again for the response. Making progress, but it would still be
> good to get clarification on how/if Processing can be used from
> standalone scripts. in the call to to runalg I did have to change the
> layer inputs from the variables containing references to the
> QgsVectorLayer objects to the layer name that I passed to those vector
> layers on creation. Processing also couldn't find the layers until I
> added them to the QgsMapLayerRegistry instance, which I think means
> when I instantiate the QgsApplication in the standalone script I need
> to pass True instead of False for it to use the GUI?
>
>
>
> On Thu, Sep 29, 2016 at 4:25 PM, Victor Olaya <volayaf at gmail.com> wrote:
> > looks like the docs are outdated and the way to call the algorithm is
> > now different
> >
> > ALGORITHM: Select by location
> >     INPUT <ParameterVector>
> >     INTERSECT <ParameterVector>
> >     PREDICATE <ParameterGeometryPredicate>
> >     PRECISION <ParameterNumber>
> >     METHOD <ParameterSelection>
> >     OUTPUT <OutputVector>
> >
> > The PRECISION parameter is not documented in the help file.
> >
> > Hope this helps
> >
> > 2016-09-29 22:39 GMT+02:00 Eric Goddard <egoddard1010 at gmail.com>:
> >> Hello everyone,
> >>
> >> I'm using QGIS 2.16.3 on Ubuntu 14.04 (from the qgis.org/ubuntugis
> >> repo with ubuntugis-unstable ppa). I have a geopackage layer (I
> >> originally started out with a spatialitelayer, but I kept getting
> >>
> >> ASSERT: "i.value() == handle" in file
> >> /tmp/buildd/qgis-2.16.3+20trusty/src/providers/spatialite/
> qgsspatialiteconnection.cpp,
> >> line 780
> >> Aborted (core dumped)
> >>
> >> when calling getFeatures() on the layer) with two columns that I want
> >> to populate. One contains the month and year a photo was taken,
> >> extracted from EXIF metadata. The other is for the name of the polygon
> >> that contains the point feature. Extracting the date from the metadata
> >> works fine, but I'm having some serious difficulties with running the
> >> 'qgis:selectbylocation' processing algorithm in a standalone script.
> >> Stack Overflow has several posts on using Processing in standalone
> >> scripts, the most recent of which [1] I tried. It crashes on line 15
> >> in my script [2](Processing.initialize()) with the following error
> >> message:
> >>
> >> The current error message I'm getting is:
> >> Error in sys.excepthook:
> >> Traceback (most recent call last):
> >>   File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 196, in
> >> qgis_excepthook
> >>     showException(type, value, tb, None, messagebar=True)
> >>   File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 107, in
> >> showException
> >>     open_stack_dialog(type, value, tb, msg)
> >>   File "/usr/lib/python2.7/dist-packages/qgis/utils.py", line 142, in
> >> open_stack_dialog
> >>     iface.messageBar().popWidget()
> >> AttributeError: 'NoneType' object has no attribute 'messageBar'
> >>
> >> Original exception was:
> >> Traceback (most recent call last):
> >>   File "extract_image_dates.py", line 14, in <module>
> >>     Processing.Initialize()
> >> AttributeError: class Processing has no attribute 'Initialize'
> >>
> >>
> >> Since I was unable to get it running in the standalone script, I
> >> loaded the script I wrote in the QGIS Python console. It ran, but it
> >> said that the number of arguments to 'qgis:selectbylocation' was
> >> wrong, but my call to the algorithim on line 55 matches the docs [3].
> >>
> >> Any pointers on how to get this working would be greatly appreciated,
> >> and I'd be happy to make a PR on the QGIS Documentation to add a
> >> section about it once it works.
> >>
> >>
> >> Thanks!
> >> Eric
> >>
> >> [1] http://gis.stackexchange.com/questions/129915/cannot-run-
> standalone-qgis-script
> >> [2] https://gist.github.com/egoddard/c188c62115f2fe8df24f32b3119e51b3
> >> [3] http://docs.qgis.org/2.14/en/docs/user_manual/processing_
> algs/qgis/vector_selection_tools.html#select-by-location
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