Hugh and list; On Fri, Feb 3, 2023 at 11:41 AM Hugh Kelley via QGIS-User < qgis-user@lists.osgeo.org> wrote:
> 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 <hghk...@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)? >> >> Have you looked at this https://en.wikipedia.org/wiki/.dbf to understand how attributes are stored in .dbf files? In particular there you will see this comment: *All field data is ASCII. Depending on the field's type, the application imposes further restrictions: * Does this help? -- Chris Hermansen · clhermansen "at" gmail "dot" com C'est ma façon de parler.
_______________________________________________ QGIS-User mailing list QGIS-User@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user