Can't read dxf

[jap2024]

I am trying to read a dxf file (which I could read smoothly years ago), but now I get this error:
AttributeError: 'LWPolyline' object has no attribute 'add'

I think the 'add' refers to the hex handle ADD, and only ocurrence in the file looks normal code 5:

LWPOLYLINE
  5
ADD
100
AcDbEntity
  8
ASSEMBLY_OUTLINES_TOP
100
AcDbPolyline
 90
        2
 70
         0
 43
0.0
 10
99.814699
 20
89.796084
 10
99.566459
 20
90.254952
  0
LWPOLYLINE
  5
ADE
100
AcDbEntity
  8
ASSEMBLY_OUTLINES_TOP
100
AcDbPolyline
 90
        2
 70
         0
 43
0.0
 10
99.814699
 20
89.796084
 10
99.809542
 20
89.790928
  0

Rest of ocurrences are 1ADD, 2ADD, etc. Again hex handles. Anyway other files with this same 'ADD' handle can be read properly.

$ACADVER
  1
AC1014

# packages in environment at C:\ProgramData\anaconda3:
#
# Name                    Version                   Build  Channel
ezdxf                     0.14.2                     py_0    conda-forge

Could you please help to overcome this issue?

Thanks in advance and best regards.

[mozman]

Hi!

First: ezdxf v0.14.2 is very old (released 2020-10-18) the current version is v1.1.4.

Second: No, the error message says something completely different, your script is accessing an attribute that doesn't exist.

• I need to see your script.
• The code should be executable.
• I need the DXF file to reproduce the problem.
• Upload DXF files in a zip-archive.

[jap2024]

Hi mozman,
Thanks for your response.
This is the code I used to read the dxf file (https://ezdxf.readthedocs.io/en/stable/tutorials/getting_data.html). I tried also with the recover approach (https://ezdxf.readthedocs.io/en/stable/drawing/recover.html#module-ezdxf.recover).

import sys
import ezdxf
from ezdxf import recover

#MAIN--------------------------------
# try:
#     dwg = ezdxf.readfile("test.dxf")
# except IOError:
#     print(f"Not a DXF file or a generic I/O error.")
#     sys.exit(1)
# except ezdxf.DXFStructureError:
#     print(f"Invalid or corrupted DXF file.")
#     sys.exit(2)

#-------------------------------------+  
try:
    doc, auditor = recover.readfile("test.dxf")
except IOError:
    print(f'Not a DXF file or a generic I/O error.')
    sys.exit(1)
except ezdxf.DXFStructureError:
    print(f'Invalid or corrupted DXF file.')
    sys.exit(2)

# DXF file can still have unrecoverable errors, but this is maybe just
# a problem when saving the recovered DXF file.
if auditor.has_errors:
    auditor.print_error_report()

    
#-------------------------------------+   
print ("DXF version : {}".format(dwg.dxfversion))

msp = dwg.modelspace()
print ("DXF number of entities : {}".format(len(msp)))

And this is the output I get:

File C:\ProgramData\anaconda3\Lib\site-packages\spyder_kernels\py3compat.py:356 in compat_exec
  exec(code, globals, locals)

File c:\python_projects\read_test_dxf.py:27
  doc, auditor = recover.readfile("test.dxf")

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\recover.py:54 in readfile
  doc, auditor = read(fp, errors=errors)

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\recover.py:82 in read
  doc._load_section_dict(recover_tool.section_dict)

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\document.py:361 in _load_section_dict
  self._finalize_setup()

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\document.py:138 in _finalize_setup
  self.mline_styles = MLineStyleCollection(self)

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\entities\mline.py:273 in __init__
  self.create_required_entries()

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\entities\mline.py:277 in create_required_entries
  entity: MLineStyle = self.new('Standard')

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\entities\objectcollection.py:71 in new
  return self._new(name, dxfattribs={'name': name})

File C:\ProgramData\anaconda3\Lib\site-packages\ezdxf\entities\objectcollection.py:78 in _new
  self.object_dict.add(name, obj)

AttributeError: 'LWPolyline' object has no attribute 'add'

About the ezdxf version, v0.14.2 is what I get by default. I probably used even older versions back in 2018 when I used the file very often and with no errors. I have tried to force latest ezdxf in my Anaconda install (ezdxf=v1.1.0), but conflicts were found. After 2 days solving conflicts the package was not installed. I have a 6K+ lines partial log if you are interested.

About the dxf file, sorry I can't share. I will let you know if I can find a way to trim or scramble it while still reproducing the error.

Best regards.

[mozman]

This appears to be a DXF structure error, but I can only tell for sure when I get the DXF file. I added a check in Dictionary.get_required_dict() to accept only DICTIONARY entities, which in your case is a LWPOLYLINE entity. That check raises a DXFStructure exception as it is an unrecoverable error. What application originally created the DXF file?