[Qgis-developer] Using Processing in standalone PYQGIS scripts

[Victor Olaya]

looks like the docs are outdated and the way to call the algorithm is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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