Import DXF file from PyQGIS is not the same result if import from "Import Layers from DXF/DWG" menu

[oddworldng]

Describe the bug I'm developing a simple plugin to load multiple DXF files to the TOC (PyQGIS), the problem is that it isn't the same result if I load this file from QGIS menu.

How to Reproduce

In QGIS menu:

• Go to Project > Import/Export > Import Layers from DXF/DWG...

In PyQGIS:

dfx_file = r"file.dxf"
vlayer = QgsVectorLayer(dfx_file, 'layer_test', 'ogr')
subLayers = vlayer.dataProvider().subLayers()

#For each sublayer, diferent type of geometry, load a layer to map.
for subLayer in subLayers:
    #Extract the geometry type
    geom_type = subLayer.split('!!::!!')[3]
    #Set the path
    uri = "%s|layername=entities|geometrytype=%s" % (dfx_file, geom_type,)
    #Name for sub layer
    dfx_file_name = os.path.splitext(os.path.basename(dfx_file))[0]
    layer_name = "%s - %s" % (dfx_file_name,geom_type,)
    #Create layer
    sub_vlayer = QgsVectorLayer(uri, layer_name, 'ogr')
    #Add layer to map
    QgsProject.instance().addMapLayer(sub_vlayer)

QGIS and OS versions

I'm using Windows 10 and QGIS 3.10 'A Coruña'.

Additional context

For example, QGIS attribute table is not the same in both cases.

This is a dxf example file: E1822P_Modelo_Alumbrado_propuesto.dxf

[andreasneumann]

This is probably not a bug. There are simply two ways of opening/importing DXF in QGIS:

• through loading a vector layer (through ogr- there you often don't get correct styles and labels)
• by importing the DXF/DWG through the library libdxfrw into a geopackage (the method when you do Project > Import/Export > Import Layers from DXF/DWG)

The latter imports the DXF/DWG into a geopackage, and expands block geometries, styles, label settings, etc. and creates symbology rules in QGIS.

The code you list above is doing the first option.

I am not sure how the second method can be replicated using Python code. You would have to ask @jef-n for support. You can open a support request with his company Norbit (https://www.norbit.de/)

[andreasneumann]

Not sure if the second method has Python API exposed. @jef-n would know more about it.

[oddworldng]

Would be great to have access to this functionality from PyQGIS

[andreasneumann]

I think this should be changed to a feature request. I just checked the Python API. There is some DXF stuff in the API, but all is export related.

[oddworldng]

Hi, any news on this issue?

[alansaviolobo]

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