topic Re: writing dxf files in VBA Forum

writing dxf files

Anonymous — Tue, 03 Sep 2002 22:52:47 GMT

hello everyone
I am trying to insert a new entity (a LWPOLYLINE) inside an empty (is not
essential) dxf file using an text editor. One of the group codes describing
the polylines entities regards the HANDLE (code "5")(see at
http://www.autodesk.com/techpubs/autocad/acad2000/dxf/lwpolyline_dxf_06.htm
and
http://www.autodesk.com/techpubs/autocad/acad2000/dxf/common_group_codes_for
_entities_dxf_06.htm#XREF_22164_DXF_06)
. I do not know how to define the handle for the entity I want to insert.
Any suggestion is welcome.
Thanx
Bepcan

Re: writing dxf files

Anonymous — Wed, 04 Sep 2002 04:06:04 GMT

Open a blank drawing, draw a lwpolyline on it. Execute DXFOUT and look at the code that is generated by AutoCAD. Make it the same as theirs. The DXF file is nothing more than an ASCII text file.

Joe
--

Re:

Anonymous — Wed, 04 Sep 2002 14:40:47 GMT

As far as I know, you don't write the handle when
creating an object in a dxf file. Just ignore this group code when you are
creating the polyline.

Rob

style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

"joesu" <
href="mailto:joesu@worldnet.att.net">joesu@worldnet.att.net> wrote in
message
href="news:f10aad7.0@WebX.maYIadrTaRb">news:f10aad7.0@WebX.maYIadrTaRb...
Open
a blank drawing, draw a lwpolyline on it. Execute DXFOUT and look at the code
that is generated by AutoCAD. Make it the same as theirs. The DXF file is
nothing more than an ASCII text file.

Joe
--

Re:

Anonymous — Thu, 05 Sep 2002 04:00:53 GMT

Well, AutoCAD is writing it to the DXF file. This is an excerpt from a file created using DXFOUT in AutoCAD. 2B is the handle of the LWPolyline.

Joe
--
ENTITIES
0
LWPOLYLINE
5
2B

Re: writing dxf files

Anonymous — Thu, 05 Sep 2002 07:45:39 GMT

> I am trying to insert a new entity (a LWPOLYLINE) inside an empty (is not
> essential) dxf file using an text editor. One of the group codes describing
> the polylines entities regards the HANDLE (code "5")(see at
> http://www.autodesk.com/techpubs/autocad/acad2000/dxf/lwpolyline_dxf_06.htm
> and
> http://www.autodesk.com/techpubs/autocad/acad2000/dxf/common_group_codes_for
> _entities_dxf_06.htm#XREF_22164_DXF_06)
> . I do not know how to define the handle for the entity I want to insert.
> Any suggestion is welcome.

Write the files using an only style polyline. You don't need the handles
and all the other junk that Autodesk now requires in DXF files now for
some of the newer entity types. The following is all you would need for
a polyline.

This works because AutoCAD will support older file format versions of
DXF which didn't have nearly as much info. Once you start using newer
entities or items in the DXF file, AutoCAD then needs a lot more junk to
go with it to support them. Handles are just one of those things that's
needed in a newer DXF file version that isn't in the older ones.

--

Darren Young

Minnesota CADWorks, Inc.
PO Box 1172
Monticello, Minnesota 55362-1172

---snip---snip---snip--- Start DXF File
0
SECTION
2
ENTITIES
0
POLYLINE
8
0
66
1
10
0.0
20
0.0
30
0.0
0
VERTEX
8
0
10
2.725886
20
5.285
30
0.0
0
VERTEX
8
0
10
4.566485
20
5.285
30
0.0
0
SEQEND
8
0
0
ENDSEC
0
EOF
---snip---snip---snip--- End DXF File

Re:

Anonymous — Thu, 05 Sep 2002 08:29:14 GMT

If you delete the lines with the "5" and the "2B"
from the DXF file and then do a dxfin in AutoCAD, you will see that the polyline
will be created. If you list it, AutoCAD has automatically given it a
handle and it is not needed in the DXF file. Unless you need to identify
that exact polyline at a later time, you will not need the handle.

style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

"joesu" <
href="mailto:joesu@worldnet.att.net">joesu@worldnet.att.net> wrote in
message
href="news:f10aad7.2@WebX.maYIadrTaRb">news:f10aad7.2@WebX.maYIadrTaRb...
Well,
AutoCAD is writing it to the DXF file. This is an excerpt from a file created
using DXFOUT in AutoCAD. 2B is the handle of the LWPolyline.

Joe
--
ENTITIES
0
LWPOLYLINE
5

2B

Re:

Anonymous — Thu, 05 Sep 2002 08:40:30 GMT

Sorry:

I was using a AcadPolyline not
AcadLWPolyline

style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

"RWEBB" <rwebb@smednet.com>
wrote in message
href="news:A09077D689ADAE685465AA17BEF7CA4A@in.WebX.maYIadrTaRb">news:A09077D689ADAE685465AA17BEF7CA4A@in.WebX.maYIadrTaRb...

If you delete the lines with the "5" and the "2B"
from the DXF file and then do a dxfin in AutoCAD, you will see that the
polyline will be created. If you list it, AutoCAD has automatically
given it a handle and it is not needed in the DXF file. Unless you need
to identify that exact polyline at a later time, you will not need the
handle.

style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

"joesu" <
href="mailto:joesu@worldnet.att.net">joesu@worldnet.att.net> wrote in
message
href="news:f10aad7.2@WebX.maYIadrTaRb">news:f10aad7.2@WebX.maYIadrTaRb...
Well,
AutoCAD is writing it to the DXF file. This is an excerpt from a file
created using DXFOUT in AutoCAD. 2B is the handle of the LWPolyline.

Joe
--
ENTITIES
0
LWPOLYLINE

5
2B