Fernando Pacheco wrote:
> I'm trying to access a grass vector map with python (2.6). I'm using the svn
> version (revision 42 565) but keep getting "Segmentation fault" when trying
> to open the file with Vect_open_old (map, input, mpaset). The code I'm using
> can be found here: http://osgeo.pastebin.com/VLGunxyq
> Can you please tell me I'm doing wrong (the same code works well with python
> libraries generated with SWIG)?.
There are two problems, one in your code, one in the ctypes wrappers.
First, Vect_open_old needs a pointer to a a Map_info structure, not
the structure itself, so you need to use byref(), e.g.:
from ctypes import *
...
vector.Vect_open_old(byref(map), input, mapset)
Second, if LFS is enabled, any files which use the vector structures
are compiled with -D_FILE_OFFSET_BITS=64. This wasn't being passed to
the preprocessor when the ctypes wrappers were generated, resulting in
incorrect wrappers being generated for various structures, including
the Map_info structure. This should be fixed by r42566.
--
Glynn Clements <gl...@gclements.plus.com>
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