Help with exporting layer lineweight in dxf

[Bica.Bogdan]

Hello,

Recently we tried adding layer lineweight to our DXF 2000 export. The original programmer is no longer working with us, and this is my  first time working with DXF so stupid questions may be asked.

We are exporting layers and everything seems to be working fine when we import it into Autocad 2015, except the layer lineweight, which always gets set on Default, instead of a value.

I'll post what we get when we export 

TABLE
  2
LAYER
  5
A61483
100
AcDbSymbolTable
 70
2
  0
LAYER
  5
A61441
100
AcDbSymbolTableRecord
100
AcDbLayerTableRecord
  2
0
 70
0
 62
7
  6
CONTINUOUS
370
18
  0
LAYER
  5
A61475
100
AcDbSymbolTableRecord
100
AcDbLayerTableRecord
  2
Plankopf
 70
0
 62
7
  6
CONTINUOUS
370
18
  0
ENDTAB

 I've tried exporting the same thing from autocad, and compare the results. I've copy-pasted parts of the DXF file, mainly up the chain of dependencies codes 330 and 390, but it still would not work. If i went far enough, it wouldn't even load anymore.

Any ideas?

Thanks a lot

[Bica.Bogdan]

Separate comment again, no idea how to edit via mobile. My guess it's something in the headers. But lineweight shouldnt be associated to anything.

[Gary_J_Orr · Accepted solution]

well, I'll post this last and be done then (it's 9:30 am here BTW):
The DXF version that you are creating is for the R14 release DXF (in which plotting was wholly defined via color to pen weight) and the value seems to get ignored on import.
Changing the DXF header to a 2000 format (15) means that you do not have enough information for ACAD to evaluate and create the layer as there were a lot of other changes (as well as the addition of the lineweight group code) such as plotstyle and noplot that require codes that your application is not producing in the dxf file....

there is also the matter of no acad classes section in which there seems to be a number of classes that may have an impact such as dictionaries and layer index classes... would the layer Index class make a difference? I don't know...

Short of it is... you are not going to be able to do it without a deeper rebuild specifically targeting a newer DXF version (r15 or better for this particular case instead of the r14 version).

I'm out,
Gary

[Bica.Bogdan]

Thanks a lot Gary. The first warning sign was when i exported our loaded file again from autocad and it had 20k lines to our 2k.
So it's the worst case scenario. I'll get it up with my managers and see what they decide. If we update to a newer version, you'll probably se a lot more of me here. Is this the correct forum for Dxf questions? Most of the search results led to here to here?
And thanks again everyone for your help!