[winGRASS] Running batch queries in grass on windows from inside another application

[Buchan Milne]

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My current project involves integrating some GIS functionality into a
simulation that can only run on Windows, preferably using grass. It also
involves pulling the coordinates to be queried from another system.

At present, I have the coordinate queries and grass queries working
under linux, however, I can't seem to get this to work on Windows with
grass/cygwin, and it seems to be related to environment variables.

I am developing my "glue code" with wxWindows, so I have code that is
almost identical under Windows and Linux. Under linux, I can just build
up a grass query (utilizing batch-grass to pass arguments that I want to
become the environment variables), and execute it, and can get the
results back in the form I want, and do the calculations necessary to
get the data in the form the simulation needs.

However, if I run the same program under Windows/cygwin, using a
shell->batch ported version of batch-grass, variables set in the command
prompt are not propagated to the grass programs (such as r.what).
Exporting varaibles in a cygwin bash shell also does not seem to affect
the grass query run from inside my application (which is started from
inside a cygwin shell). Launching a shell (ie sh -c 'batchgrass db
location query') also does not seem to work.

So, does anyone know how I can achieve this on Windows? I am kind of
missing a grass SDK ...

Regards,
Buchan

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Buchan Milne                Mechanical Engineer, Network Manager
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