[GRASS5] Swig interface for Grass
ari.jolma at tkk.fi
Tue Aug 30 10:25:44 EDT 2005
[note: this discussion got initiated outside this list]
Markus Neteler wrote:
>One example as "seed" may be sufficient to get other people
>interested, something like a proof of concept. This may break
>the barrier to do more python and perl with GRASS.
Well, I managed to get a Grass error message from a Perl program :)
I made a simple Swig interface file into which I added the main() from
r.slope.aspect with a new name:
int r_slope_aspect (int argc, char **argv);
With this I get the wrapper code and the Grass Perl module. Then I made
a simple Makefile.PL for the Perl extension, which lists the shared
grass libs and object code files from the wrapper and the
r_slope_aspect. Makefile.PL is standard, after running it gives
Makefile, which is for making the necessary binaries for the Grass
module and installing the module etc. I put into the test code a
which gives me the Grass error "ERROR: LOCATION_NAME not set"
I have a Grass database and I get the same error running r.slope.aspect.
I had to comment out a lot of declarations from gisdefs.h because the
functions are non-existing and Perl does not tolerate that.
The tedious part would be to write typemaps for all structs in Grass
code. Converting all modules into functions is a more difficult job but
could probably be automated (with a suitable Perl program of course).
Prof. Ari Jolma
Kartografia ja Geoinformatiikka / Cartography and Geoinformatics
Teknillinen Korkeakoulu / Helsinki University of Technology
POBox 1200, 02015 TKK, Finland
Email: ari.jolma at tkk.fi URL: http://www.tkk.fi/~jolma
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