[Qgis-user] QGIS 3 Standalone Python Script

[DT]

Thanks William!  All is working now.

Chris - here's what is working for me:
https://gist.github.com/dmofot/94345126db10660053ccfb0d76a1e32a

and I'm just passing the layers (full path) into the script.  For example,
/Users/<user>/Documents/<shp_filename.shp>

DT

On Mon, Aug 6, 2018 at 11:03 AM, Chris B <snowstorms at mac.com> wrote:

> Thanks so much for helping out with this.
>
> The script now no longer fails looking for Qt, great!
>
> But I'm still getting a very basic error -- loading a layer from the file
> system doesn't work.  Here's the script:
>
> import sys
>
> sys.path.insert(0,'/Applications/QGIS3.app/Contents/Frameworks/')
> sys.path.insert(0,'/Applications/QGIS3.app/Contents/Resources/python/')
> sys.path.insert(0,'/Applications/QGIS3.app/Contents/Resources/python/
> plugins')
>
> from qgis.core import (
>      QgsApplication,
>      QgsProcessingFeedback,
>      QgsVectorLayer
> )
> from qgis.analysis import QgsNativeAlgorithms
>
> # Start the QGIS App
>
> qgs = QgsApplication([], False)
> qgs.initQgis()
>
> # Start Processing plugin
>
> import processing
> from processing.core.Processing import Processing
> Processing.initialize()
> QgsApplication.processingRegistry().addProvider(QgsNativeAlgorithms())
>
> # Load Layer
>
> layer = QgsVectorLayer('21185.shp', 'my layer', 'ogr')
>
> if not layer.isValid():
>   print("Layer failed to load!")
>
> # Set parameters
>
> params = {
>     'INPUT': layer,
>     'OUTPUT': 'memory:'
> }
> feedback = QgsProcessingFeedback()
>
> # Run processing algorithm
>
> res = processing.run("native:extractvertices", params, feedback=feedback)
> res['OUTPUT'] # Access your output layer
>
> When I test for layer validity, it says the layer fails to load and then
> segfaults (which makes sense since the object is null).
>
> I tried referring to the file locally (eg. 'file.shp') and from the root of
> the drive ('/Users/[user]/path/to/script/file.shp') and neither worked.
>
> Am I missing something for QgsVectorLayer to work?  Seems like an odd
> error.
>
> Thanks again,
> C.
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html
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