Basic C modules

Basic C modules are the simplest way to interface the framework with C code. Note that contrary to C modules with interfacing configuration, using C modules this way is more invasive for the C library.

Declaration

These modules are declared by the top-level cModule element. For example:

      <cModule name="FlightManagementSystem">

C implementation

The cImplementation element declares the C dll which implements the module. For example:

      <cModule name="FlightManagementSystem">
         <cImplementation path="myCLib" />
      </cModule>

The path attribute refer to the name of the dll (without the ".dll" extension) which implements the module. The path of this file is by default relative to the application.xml file which declares the module.

C module implementation constraints

C modules can only process the following data types:

framework type	C size	Native C type
int	32-bit integer	int
long	64-bit integer	long long
short	16-bit integer	short
byte	8-bit integer	char
char	16/32-bit character	wchar_t
boolean	boolean value	int
float	32-bit FP	float
double	64-bit FP	double
String	C string	char*

C implementation

The element referred by the path attribute is a dll, which is by default relative to the application.xml file which declares the module.

This module has no C dependencies to the framework, but some functions with specific signatures need to be declared in order for the module to work correctly.

Setting a Visual Studio project for the C module dll