Hello,

I have followed the steps in 'C_IN_32Bit_E.pdf' to make a obj file to link a lib made in CodeSys. It works very well when the '.c' file doesn´t use a function made in another '.c' file.

However when it happens, the lib from codesys needs more than one obj file to link all functions.

I would like to know if to build a lib in CodeSys with more than one obj file from visual c is possible.

If not, has anybory any alternative or clue to make it?

I´m looking forward to know any clue...

Thanks a lot,

Daniel

Hi Daniel

Have you managed to make a C external library work in CoDeSys?

I tried to compile a simple function that does nothing but return a single short.

I followed the steps in 'C_IN_32Bit_E.pdf' and everything went ok, I copied the .lib and .obj files to the same folder and the project built with no warnings.

But when I try to test it on a real PLC I get the message during download of the program: >Zitat:
Unresolved External POUs: LIB_FUN1

The PLC runs on a SH4 processor architecture, I think this could be a reason to the problem as I compiled the code on Visual C++ 2008 EE.

Here is my file lib_fun.h

/* Enum definitions */
/* The Prototypes */
short LIB_FUN1(void);

Here is my file lib_fun.c

\#include "C:\Libs\Test\lib_fun.h"
/* The implemenation templates */
short LIB_FUN1(void)
{
   return 42;
} 

Thanks for any help,

Danilo

Try by placing the .dll file.