Can merge dxf with ezdxf

[Kordexa Stroken]

Hello Everybody,

I want to merge 2 dxf files.Is there any way make with ezdxf 

best regards

[Manfred Moitzi]

Hi!

Yes, but it is complicated ;)

ezdxf can not import DXF R12 into later DXF versions and vice versa. Works best if both

drawings have the same DXF version or the target has a later version than the source 

drawing. ezdxf imports tables, blocks and the entities section.

source_dwg = ezdxf.readfile('source.dxf')
target_dwg = ezdxf.readfile('target.dxf')
importer = ezdxf.Importer(source_dwg, target_dwg)
importer.import_all()
# for drawings without block references:
# importer.import_tables()
# importer.import_modelspace_entities()
target_dwg.saveas('merged.dxf')

# check drawing, but works just in the upcoming version v0.8.5
if ezdxf.version < (0, 8, 5):
    exit()
auditor = target_dwg.auditor()
errors = auditor.run()
if len(errors) == 0:
    print('Import OK.')
else:
    print('Import maybe failed.')

Because of the complex internal references in DXF files, importing is not a good idea and will not work often. ezdxf is not a CAD application!

BTW: The importer is an old module and not often used by myself, so strange things may be happen.

Best regards,

Manfred

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[Kordexa Stroken]

Hi,

Thanks for your reply.This is option enough for me.I will test it 

Best Regards

23 Ocak 2018 Salı 06:58:13 UTC+2 tarihinde Manfred Moitzi yazdı:

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[Yuxiang Song]

Hi, 

It doesn't work for me.

Here is my code: 

source_dwg = ezdxf.readfile("source.dxf")

target_dwg = ezdxf.new(source_dwg.dxfversion)

importer = ezdxf.Importer(source_dwg, target_dwg)
importer.import_all()

target_dwg.saveas('test.dxf')

But I got errors:

Traceback (most recent call last):

  File "E:/reseaux/example.py", line 56, in <module>

    importer.import_all()

  File "C:\Users\y.song\AppData\Local\Programs\Python\Python36\lib\site-packages\ezdxf\tools\importer.py", line 39, in import_all

    self.import_modelspace_entities()

  File "C:\Users\y.song\AppData\Local\Programs\Python\Python36\lib\site-packages\ezdxf\tools\importer.py", line 52, in import_modelspace_entities

    target_modelspace.add_entity(new_entity)  # add entity to modelspace

  File "C:\Users\y.song\AppData\Local\Programs\Python\Python36\lib\site-packages\ezdxf\legacy\layouts.py", line 124, in add_entity

    for linked_entity in entity.linked_entities():

  File "C:\Users\y.song\AppData\Local\Programs\Python\Python36\lib\site-packages\ezdxf\dxfentity.py", line 136, in linked_entities

    entity = wrap(link)

  File "C:\Users\y.song\AppData\Local\Programs\Python\Python36\lib\site-packages\ezdxf\legacy\factory.py", line 102, in wrap_handle

    raise DXFKeyError('invalid handle #{}'.format(handle))

ezdxf.lldxf.const.DXFKeyError: 'invalid handle #28A23'

ezdxf cannot create new handle for blocks.

Do you knows where is the problem? 

Thanks,

Best regards

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[Manfred Moitzi]

Same answere as on GitHub:

1. It is not possible to fix anything without the used data!
2. WHY are you importing the data into a new drawing, just open the source drawing and save  it as a new file.
3. For the upcoming release 0.9.0: moved Importer() from ezdxf.tools to ezdxf.addons - internal structures of modern DXF files are too complex and too undocumented to support importing data in a reliable way - using Importer() may corrupt your DXF files or just don't work!
   

Don't relay on this feature, it may be removed in the future.