Julien,
> I was looking to create an empty GPKG layer and try the solution Even
> provide, but it creates an invalid file.
>
> fields=QgsFields()
> fields.append(QgsField("note", QVariant.Double))
> QgsVectorFileWriter.create("/tmp/test.gpkg", fields,
> QgsWkbTypes.MultiLineString, QgsProject.instance().crs(),
> QgsCoordinateTransformContext(), QgsVectorFileWriter.SaveVectorOptions())
>
> I try also:
> lyr = "mylayer"
> QgsVectorFileWriter.create("/tmp/again.gpkg", fields,
> QgsWkbTypes.MultiLineString, QgsProject.instance().crs(),
> QgsCoordinateTransformContext(), QgsVectorFileWriter.SaveVectorOptions(),
> QgsFeatureSink.SinkFlags(), None, lyr)
>
> It looks like there is no layer in the produced GPKG. Is it an issue, or am
> I misunderstanding the use of QgsVectorFileWriter?
The issue is likely QgsVectorFileWriter.SaveVectorOptions() with no driverName
set. There's
no extension based guessing. Probably that the SaveVectorOptions inner class
could have a
"GPKG" default value for driverName, as it is the default driver name in other
methods of
qgsvectorfilewriter.h
There are some usage examples of QgsVectorFileWriter in
https://github.com/qgis/QGIS/blob/master/tests/src/python/test_qgsvectorfilewriter.py
(not of create() though)
Even
--
Spatialys - Geospatial professional services
http://www.spatialys.com
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