[Qgis-user] use Binary (Blob) in writeAsVectorFormat

[Hugh Kelley]

to follow up as I continue to work on this,

I mistakenly understood the attribute type "binary" as a Boolean, but I
think it's in fact an arbitrary value stored as binary. That is to say, not
necessarily True/False or 0/1 but a series of 0/1's storing a value.

If I can save it to the shapefile that would be great but I'm going to work
on filtering those attributes out of what's saved as that's an acceptable
solution too I think.

On Fri, Feb 3, 2023 at 2:24 PM Hugh Kelley <hghklly at gmail.com> wrote:

> Hi,
>
> I'm attempting to use pyqgis to export a few things to shapefile.
>
> the code below is working well except that a few of the attributes are
> incompatible with shapefiles (amazing) lack of a binary datatype.
>
> ```py
> pathToFile = "C:/Users/hkelley/Downloads/test_exports/
>
> layers = QgsProject.instance().mapLayers()
>
> for layer_id, layer in layers.items():
>     print(layer.name())
>     QgsVectorFileWriter.writeAsVectorFormat( layer,  pathToFile+
> layer.name() + ".shp", "utf-8", layer.crs(), driverName="ESRI Shapefile" )
> ```
>
> I see in the manual export options that I can check a box telling the
> export process to use "Use Binary (BLOB)". Image linked below for clarity
> [0]
>
> I haven't yet figured out how to pass that option to writeAsVectorFormat.
>
> any suggestions?
>
> Iv'e had a pretty thorough look through the docs for writeAsVctorFormat,
> is the solution related to
> QgsVectorFileWriter.BoolOption(QgsVectorFileWriter.BoolOption)?
>
>
>
> [0] https://imgur.com/a/9zSMHKq
>
> --
> Hugh Kelley
>
>

-- 
Hugh Kelley
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20230203/306acdd5/attachment.htm>