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List: qgis-developer
Subject: Re: [Qgis-developer] Using Processing in standalone PYQGIS scripts
From: Eric Goddard <egoddard1010 () gmail ! com>
Date: 2016-09-30 14:30:17
Message-ID: CAMM2+YrLr-iaOM_XY6mo3N1rf2Pa69pGn=pBQwRXkNCRvyfxew () mail ! gmail ! com
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Thank you Victor and Etienne, the capital Initialize() got me :( It's
always the little things - sorry about that! Now the processing script
runs successfully as a standalone script but still has the issue of
not selecting anything in the input layer. I was able to use the
QgsVectorLayer variables as inputs to the tool, but it still didn't
select the features.
Thanks,
Eric
On Fri, Sep 30, 2016 at 9:24 AM, Victor Olaya <volayaf@gmail.com> wrote:
> Not sure why it is not selecting your features. I will try to
> reproduce it and will let you know
>
> About the layers and how they are found, here is some info: Input
> layers for Processing are data sources (if a layer is file based, that
> means the filepath to it). If you enter something that is not that,
> Processing tries to figure out what you mean, basically checking if
> any of your layers has the name you entered, and then using it's
> layer.source() value. But for that, the layer must be loaded. To avoid
> that, you can directly enter the path to your layer, instead of a
> layer name
>
> I will let you know once i can reproduce your issue and find out what
> is happening
>
> Cheers
>
> 2016-09-30 16:07 GMT+02:00 Etienne Trimaille <etienne.trimaille@gmail.com>:
> > > 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@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@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@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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