Help with creating a MEX file in MATLAB from multiple C++ Source codes

I am trying to create a MEX file in MATLAB with multiples C++ source codes in .cpp and .h extensions. The C++ source codes builds fine with no errors in Microsoft Visual C++ 2010 professional and i have created a static library of .lib file All source code files and static library of functions are located in my MATLAB current folder path In MATLAB i have selected my default compiler as MS Visual C++ Professional 2010 and i am using the following syntax in MATLAB mex -v [list of C++ source code files i.e. .cpp and .h files] -l[static library name] -L.

I get a link error in MATLAB as; LINK : error LNK2001: unresolved external symbol mexFunction C:\Users\abo09001\AppData\Local\Temp\mex_Ko9pXP\templib.x : fatal error LNK1120: 1 unresolved externals

I do not know how to program in C++ but i am relatively ok in MATLAB. Any help with the error will be appreciated.

[Abigail Osei-Asamoah]

I am using MATLAB 2012a

[Nathan Crosty]

Are your functions and or symbols that you are referencing externs?

[Abigail Osei-Asamoah]

I don't believe they reference externs

Answer 1

[Kaustubha Govind]

All MEX-functions need to have an entry-point named mexFunction with a specific prototype. I would recommend that you read the section Creating a Source MEX-File to help you get started.

Answer 2

[Abigail Osei-Asamoah]

I already tried to include the gateway function to the .cpp files and the #Include "mex.h" but i get errors when i try try to create the MEX file in MATLAB with the mex command after adding the gateway function and the #include "mex.h"

[James Tursa]

What errors specifically?

[Jan]

Then please post the error message to give us a chance to help you.

[Abigail Osei-Asamoah]

After adding #include "mex.h" and void mexFunction( int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]) {

/*sourcecode here */ }

to my main.cpp code and trying to create mex with my .cpp files and headers i get the following error in matlab :

main.cpp main.cpp(22) : error C2601: 'main' : local function definitions are illegal main.cpp(16): this line contains a '{' which has not yet been matched

I checked line 16 in the C++ code and the '{' is matched by '}' after the source code so i don't know what is wrong. How do i fix this error? Any help is appreciated. Thanks

[Abigail Osei-Asamoah]

Thank you all for the help but i have been able to create the MEX files. I was getting an error because i was placing another function in my source .cpp codes within the mex function used to create the gateway routine in my .cpp files. Once i separated the mex function from that function i.e. i didn't define a function within a function,MATLAB has successfully created my MEX file. Thanks.