[GRASS-dev] python ctypes vect_open_old

[Maris Nartiss]

Hello,
remember - You are writing an C application in Python. You still have
to worry about pointers and memory allocation, still in a bit more
relaxed way.

Try to read my (unfinished) code at [1]. Provided example opens vector
map for reading, goes over all vector multilines (lines with identical
CAT) and seeks for multiline start/end. If one is found, it rearranges
all multilines to be in incremental order from start to end. Works
only if multilines are simple (i.e. stright streets without double
lines, self-crossings etc.). It's not a good example of Python code,
but it works.

Hope this helps,
Maris.

1. http://www.gisnet.lv/trac/gisnet/browser/gisnettools/v.reorder_line_segments.py

PS. If this tool fails with FATAL EGGOGG, remove corssection check
around line 279, still then it might go in to infinite loop, if
multiline has a loop in middle.


2010/9/7, neuba <danhofr at gmail.com>:
>
> Hi every body,
> I am tring to understand ctypes with grass and I got the following message
> when i use thing program line:
> vect.Vect_open_old(input,mpaset)
> illegal filename: character ?? not allowed
> dbiv@??
> how can resolve this problem.
> Bye
> --
> View this message in context:
> http://osgeo-org.1803224.n2.nabble.com/python-ctypes-vect-open-old-tp5507145p5507145.html
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