Using Coder's generated C files in Visual Studio ?

[EDIT: 20110608 10:34 CDT - reformat - WDR]

Hello Folks,

I have successfully changed my .m files to .c files using Matlab Coder. May you guide me on how to use these files in Visual Studio ?

my function name is faceImage.c

In my Visual Studio .cpp file, I included:

#include "faceImage.h"
#include "faceImage_initialize.h"
#include "faceImage_terminate.h"

But when i compile the file i get:

error LNK2019: unresolved external symbol "void __cdecl faceImage_initialize(void)" (?faceImage_initialize@@YAXXZ) referenced in function _wmain

Can you please give me an example or any reference that may aid me to solve such problem.

Loads of thanks

Answer 1

[John Elliott]

Assuming you're just generating the C++ code (and not creating a library), don't forget to add faceImage_initialize.cpp and faceImage_terminate.cpp to you VS project. Adding something to the linker's path won't do the job.

If you're creating a library using MATLAB Coder, then you need to add the library to the linker's input files in your VS project.

Answer 2

[Kaustubha Govind]

Have you included faceImage.c in your Visual Studio project?

Note that if you are calling C functions from C++ files, you need to include the extern "C" directive: How do I call a C function from C++?

You might need to add this to the generated header files for all functions that you intend to call from a .cpp file.

[Chirag Gupta]

As Kaustubha pointed it out, just add "C" in all the header files:

Instead of extern void face_initiallize(...), just make it

extern "C" void face_initialize(...)

[Louis]

Thank you very much for your answers. Instead of going through the hassle of adding the C extern, i regenerated C++ files using Coder. So now i have faceImage.cpp.

So now i should be able to call it easily. I added the path(\codegen\lib\faceImage) to the Visual Studio's project. Specifically: C/C++->general-> Additional Include Directories, and to Linkers->general->Additional Library Directories.

Sadly, i still get the same LNK2019 error. Do you think i am having a problem in adding the headers or the library ?

Really appreciate your feedback. Thank you.