GRASS and C++ - Revision history

Neteler: +GRASS Programmer's Manual

2012-11-27T21:06:47Z

+GRASS Programmer's Manual

← Older revision		Revision as of 21:06, 27 November 2012
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	* [[GRASS and Python]]		* [[GRASS and Python]]
			* [http://grass.osgeo.org/programming7/ GRASS 7 Programmer's Manual]

	[[Category:Development]]		[[Category:Development]]
	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
	[[Category:C++]]		[[Category:C++]]

Neteler: fix from Glynn (ML)

2012-05-08T22:44:13Z

fix from Glynn (ML)

← Older revision		Revision as of 22:44, 8 May 2012
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	<source lang="c">		<source lang="c">
	extern "C"		#ifdef __cplusplus
	{		extern "C" {
	#~~include <grass/gis~~.h>		#endif

			...

			#ifdef __cplusplus
	}		}
			#endif
	</source>		</source>

	The C++ compiler will understand that the functions defined in gis.h are coded in C. If it is not specified the linking step will throw an error stating that the symbols for the C functions were not found in the shared library.		The C++ compiler will understand that the functions defined in gis.h are coded in C. If it is not specified the linking step will throw an error stating that the symbols for the C functions were not found in the shared library. Without the 'extern "C" ...' qualification, C++ assumes that functions have C++ linkage, meaning that the parameter types are embedded in the symbol name (C++ allows function overloading, where multiple functions can have the same name provided that they have different parameter types).

	== See also ==		== See also ==

⚠️Xrubio: /* Notes */

2012-05-07T09:05:49Z

Notes

← Older revision		Revision as of 09:05, 7 May 2012
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	== Notes ==		== Notes ==

	~~When developing~~ C++ code to ~~call a C function you need~~ to ~~specified for~~ the compiler ~~that~~ the ~~gis.h include is~~ C ~~code with~~:		C++ code that use C shared libraries needs to specify this fact to the compiler. This can be defined with the ''extern "C"'' keyword, in this way:

	<source lang="c">		<source lang="c">
Line 28:		Line 28:
	}		}
	</source>		</source>

			The C++ compiler will understand that the functions defined in gis.h are coded in C. If it is not specified the linking step will throw an error stating that the symbols for the C functions were not found in the shared library.

	== See also ==		== See also ==

⚠️Landa at 20:54, 5 May 2012

2012-05-05T20:54:26Z

← Older revision		Revision as of 20:54, 5 May 2012
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	}		}
	</source>		</source>

			== See also ==

			* [[GRASS and Python]]

	[[Category:Development]]		[[Category:Development]]
	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
	[[Category:C++]]		[[Category:C++]]

⚠️Landa: /* Calling GRASS library functionality in C++ */

2012-05-05T20:53:25Z

Calling GRASS library functionality in C++

← Older revision		Revision as of 20:53, 5 May 2012
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	I/O:		I/O:
	* ~~http://trac.osgeo.org/grass/browser/grass/trunk/~~lib/iostream/		* {{src\|lib/iostream/}}

	Raster data processing		Raster data processing
	* ~~http://trac.osgeo.org/grass/browser/grass/trunk/~~raster/r.terraflow/		* {{src\|raster/r.terraflow/}}

	Image processing		Image processing
	* ~~http://trac.osgeo.org/grass/browser/grass/trunk/~~imagery/i.atcorr/		* {{src\|imagery/i.atcorr/}}

	Visualization:		Visualization:
	* ~~http://trac.osgeo.org/grass/browser/grass/trunk/~~visualization/xganim/		* {{src\|visualization/xganim/}}
	* ~~http://trac.osgeo.org/grass/browser/grass/trunk/~~visualization/wximgview/		* {{src\|visualization/wximgview/}}

	== Notes ==		== Notes ==

⚠️Landa: /* Calling GRASS library functionality in C++ */

2012-05-05T20:52:19Z

Calling GRASS library functionality in C++

← Older revision		Revision as of 20:52, 5 May 2012
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	For working examples, see:		For working examples, see:

	~~Digitizer:~~
	* http://trac.osgeo.org/grass/browser/grass/trunk/gui/wxpython/vdigit/

	I/O:		I/O:

Neteler: +notes

2012-05-05T19:53:10Z

+notes

← Older revision		Revision as of 19:53, 5 May 2012
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	* http://trac.osgeo.org/grass/browser/grass/trunk/visualization/wximgview/		* http://trac.osgeo.org/grass/browser/grass/trunk/visualization/wximgview/

			== Notes ==

			When developing C++ code to call a C function you need to specified for the compiler that the gis.h include is C code with:

			<source lang="c">
			extern "C"
			{
			#include <grass/gis.h>
			}
			</source>

	[[Category:Development]]		[[Category:Development]]
	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
	[[Category:C++]]		[[Category:C++]]

Neteler: more examples

2010-04-19T19:07:21Z

more examples

← Older revision		Revision as of 19:07, 19 April 2010
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	== Calling GRASS library functionality in C++ ==		== Calling GRASS library functionality in C++ ==

	~~See~~:		For working examples, see:

			Digitizer:
	* http://trac.osgeo.org/grass/browser/grass/trunk/gui/wxpython/vdigit/		* http://trac.osgeo.org/grass/browser/grass/trunk/gui/wxpython/vdigit/

			I/O:
			* http://trac.osgeo.org/grass/browser/grass/trunk/lib/iostream/

			Raster data processing
			* http://trac.osgeo.org/grass/browser/grass/trunk/raster/r.terraflow/

			Image processing
			* http://trac.osgeo.org/grass/browser/grass/trunk/imagery/i.atcorr/

			Visualization:
			* http://trac.osgeo.org/grass/browser/grass/trunk/visualization/xganim/
			* http://trac.osgeo.org/grass/browser/grass/trunk/visualization/wximgview/


	[[Category:Development]]		[[Category:Development]]
	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
	[[Category:C++]]		[[Category:C++]]

Neteler: better use the code browser in trac

2010-04-14T15:19:19Z

better use the code browser in trac

← Older revision		Revision as of 15:19, 14 April 2010
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	See:		See:
	* ~~https~~://~~svn~~.osgeo.org/grass/grass/trunk/gui/wxpython/vdigit/		* http://trac.osgeo.org/grass/browser/grass/trunk/gui/wxpython/vdigit/

	[[Category:Development]]		[[Category:Development]]
	[[Category:Linking to other languages]]		[[Category:Linking to other languages]]
	[[Category:C++]]		[[Category:C++]]

Neteler: new

2010-04-13T14:32:18Z

new

New page

''(page to be expanded)''

== Calling GRASS library functionality in C++ ==

See:
* https://svn.osgeo.org/grass/grass/trunk/gui/wxpython/vdigit/

[[Category:Development]]
[[Category:Linking to other languages]]
[[Category:C++]]