Thanks Alessandro and Even for your replies,
I try your suggestions but I still get the error. I opened an issue
https://github.com/qgis/QGIS/issues/37386
Kind regards,
Julien
> On Wed, Jun 24, 2020 at 2:57 PM Julien Cabieces
> <julien.cabie...@oslandia.com> wrote:
>>
>>
>> Hi alls,
>>
>> 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?
>
> Hi Julien,
>
> I believe you need to add at least one feature to trigger the layer
> creation (through QgsVectorFileWriter/GDAL).
>
> You may try QgsAbstractDatabaseProviderConnection::createVectorTable
> or QgsProviderRegistry::createEmptyLayer (they both use the same
> provider's code)..
>
> Hope it helps.
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