Using C API in Lycia

The C API in Lycia allows a developer to call C functions in their 4GL code. C code cannot be embedded in Lycia 4GL, to use it you must put it into a dynamic C library and then link this library to your program. Calling C functions from Lycia programs differs a bit from calling them using earlier compiler versions.

 

To be able to use a C function, these requirements must be met:

• The C source should contain a global variable usrcfuncs, declared using the cfunc_t struct defined in fgifunc.h. This is used to declare which C functions should be callable from the 4GL.
• All C source must be compiled into a dynamic library and linked against lib4glc in the Lycia distribution.
• The ready C library should be linked to the 4GL program which uses the C functions.