[GRASS5] howto: direct access to raster cells - skeletons in cvs?

Glynn Clements glynn.clements at virgin.net
Wed Sep 29 22:33:56 EDT 2004

Stefan Paulick wrote:

> I want to perform the following task:
> 	1) read a single cell in a raster map
> 	2) modify its value
> 	3) write it back and display the map 
> When having a look at r.example using KDevelop, I received 	
> 	module = G_define_module();
> 	->  warning: assignment makes pointer from integer without a cast
> and
> 	module->description ="GRASS raster programming example.";
> 	->  error: dereferencing pointer to incomplete type

Those messages suggest that your GRASS headers are from an extremely
old version of GRASS 5. "struct GModule" and G_define_module were
added on 2000/11/21. GRASS 4.x didn't support FP, so you would have a
lot more errors if you were trying to use 4.x headers.

r.example compiles fine with a current version of GRASS.

Glynn Clements <glynn.clements at virgin.net>

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