[Gvsig_english] gvSIG1.1.2/1.9 -problems reading annotations exported to dxf

[Benjamin Ducke]

This may not be the advise you are looking for, but
I feel that it's the only good advise on CAD and maps,
so here we go:

DXF is an *intentional* mess. It does not provide any
standard extensions but instead allows for non-standard
hacks all over the place, encouraging the production
of incompatible "extensions". It is a format designed for
technical drawings, not cartography, so it is not suitable 
for things like map labels.

Forget DXF. It sucks. Forget CAD for mapping, too.
It's made for designing engine parts, not for making maps.
Use a good GIS, like gvSIG to produce all your maps
and live happily ever after...

Ben


----- Original Message -----
From: "Enrico Gallo" <enrico.gallo-1979 at poste.it>
To: "gvsig internacional" <gvsig_internacional at listserv.gva.es>
Sent: Monday, April 19, 2010 12:16:22 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Gvsig_english] gvSIG1.1.2/1.9 -problems reading annotations exported to dxf

Dear list, dear Johanes


 ________________________________________
> De: gvsig_internacional-bounces at listserv.gva.es [mailto:gvsig_internacional-bounces at listserv.gva.es] En nombre de Johannes Valenta
> Enviado el: lunes, 18 de enero de 2010 16:48
> Para: Users and Developers mailing list
> Asunto: [Gvsig_english] gvSIG1.1.2/1.9 -problems reading annotationsexported to dxf
>
> Hi list,
> ?
> today I encountered problems reading a dxf file with Autocad.
> What did I do?
> I generated an annotation file from a shapefile which I then exported to dxf.
> gvSIG (both 1.1.2 and 1.9) properly displayed the exported dxf as points with text.
> As?I tried to load this dxf into Autocad 2002 as well as into Autocad 2009 the file could not be opened due to an invalid database reference in line xxx.
> (the german error text is "Ung?ltige Datenbankreferenz?0 auf Zeile 990. Ung?ltige oder unvollst?ndige DXF-Eingabe -- Zeichnung abgebrochen.")
> ?
> Does anybody have a clue
> a) what this error means and
> b) how I can solve this problem?
> ?
> Any hint or suggestion is appreciated
> ?
> Best,
> ?
> Johannes


today I had the same problem...

Invalid database handle      0 on line 990.
Invalid or incomplete DXF input -- drawing discarded.

After a few hours of useless struggles with DXF references
http://images.autodesk.com/adsk/files/dxf_format.pdf

I solved just editing dxf with a text editor and deleting ALL dxf
sections, except for "ENTITIES" one

so now, my DXF starts with

0
SECTION
 2
ENTITIES
 0
TEXT
 1
53.0

and ends with:

...
TEXT
 1
54.0
 5
    0
 8
default
 62
    0
 10
1390303.149644
 20
4992177.567597
 30
0.000000
 40
10.000000
 50
0.000000
 0
ENDSEC
 0
EOF


I know it's a brutal hack but it works fine for me...
Any better hint from developers?

Enrico Gallo, Turin
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