Glynn Clements wrote:
Duffy, Garret wrote:
I'm having major problems with some C code I'm writing within the GRASS
environment. Basically, my code opens 6 rasters, 3 of which exist
already the other 3 are new. When I look at the code with ddd
everything seems fine, i.e. the arrays for the new rasters are created
as required but when it comes to closing the rasters, the
previously-existing rasters close fine but I get 'hangup' error when I
try to close the first newly-created raster, the code crashes and I lose
the new rasters.
"Hangup" normally refers to closing the terminal. It's possible that
one of the variables which holds a descriptor has the wrong value, and
closing it closes the terminal.
Following is the mechanisms I use to open and close the files. I would
like some expert advice on whether anything looks strange just so I can
debug elsewhere in the code.
I'm not that familiar with GRASS module programming, but as you wrote
"... I can debug somewhere else in the code" I assume you perform some
read / write operations in between.
- a stepwise approach would be useful, so just open and close the
rasters; if the error still applies I can't help
- just read from the existing rasters
- write to the new rasters: a typical mistake would be to write outside
of the bounds of the arrays; at least in other GIS this may work some
time but will cause a crash on exit. Another problem might be an
unintentional calculation on NoData cells.
maybe this helps,
Volker
Apart from the issues noted above (which wouldn't cause the problems
you describe), I don't see anything wrong with your code.
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