compile .C file Include library using mex - error LNK2019: unresolved external symbol - for NPTrackingTools

Hello I'm trying to build simple C function with external commands provide by library NPTrackingTools API

 #include <stdio.h>

 #include "mex.h"

 #include "NPTrackingTools.h"

 void mexFunction(int nlhs, mxArray *plhs[],
                 int nrhs, const mxArray *prhs[])
{
    int ret1,ret2,ret3;

    ret1=TT_Initialize();
    ret2=TT_FinalCleanup();
    ret3=TT_Shutdown();

    printf("Hello, World! \n");

    return 0;
}

I tried the following compiler code

mex -v '-Id:\or hirshfeld\onedrive\work control lab aero summer 2014 technio\C_code' '-LD:\or hirshfeld\onedrive\work control lab aero summer 2014 technion\C_code' '-lNPTrackingToolsx64.lib' test_C_compile_with_include_trackingtools.c

I have all files in the same directory "d:\or hirshfeld\onedrive\work control lab aero summer 2014 technio\C_code"

but the compiler return an error that he can't understand my commands

 Error using mex
   Creating library test_C_compile_with_include_trackingtools.lib and object test_C_compile_with_include_trackingtools.exp
test_C_compile_with_include_trackingtools.obj : error LNK2019: unresolved external symbol __imp_TT_Initialize referenced in
function mexFunction
test_C_compile_with_include_trackingtools.obj : error LNK2019: unresolved external symbol __imp_TT_Shutdown referenced in function
mexFunction
test_C_compile_with_include_trackingtools.obj : error LNK2019: unresolved external symbol __imp_TT_FinalCleanup referenced in
function mexFunction
test_C_compile_with_include_trackingtools.mexw64 : fatal error LNK1120: 3 unresolved externals

I tried different variation but still have the same problem, can you help me?

Thanks

Or Hirshfeld

אור הירשפלד

Answer 1

[Or Hirshfeld]

Solution by chappjc (<http://stackoverflow.com/users/2778484/chappjc>) from Stack Overflow Forum

http://stackoverflow.com/questions/29880512/compile-c-file-include-library-using-mex-error-lnk2019-unresolved-external-s/29881292#29881292

"The library (.lib) you are trying to link to seems to be a C++ library, although these functions have C entry points (check with Dependency Walker). I got it to compile by renaming your mexFunction source from .c to .cpp, putting the header and source in the same folder, and compiling like:

 mex -v  -L. -lNPTrackingToolsx64 test_C_compile_with_include_trackingtools.cpp

although you can simply list object files on the command line like this:

 mex -v test_C_compile_with_include_trackingtools.cpp NPTrackingToolsx64.lib

Just list the source file first or the output .mexw64 file will have the name of the library!"

All i needed is rename it .CPP so it compiled in C++. I didn't do anything extra to link it to Intel's OpenMP runtime library, I guess Matlab already link it by defualt.