Can I use MEX API in a C++ non-MEX dll with the loadlibrary command?

I would like to build a dll with mxArray API and then load this into MATLAB with the loadlibrary command.

Answer 1

[MathWorks Support Team]

You can use MEX API in your dll and then access this dll with the MATLAB loadlibrary command. Here is a C++ example:

/*MatlabGateway.cpp*/

#include "mclmcr.h"

#include "MatlabGateway.h"

extern "C"

{

void testbugfunc(int nlhs, mxArray *plhs[], int nrhs,

                   const mxArray *prhs[])

{

// just assign a scalar return value to 9999 so we know it

// is different to the Matlab

plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);

double data[1] = {9999};

      memcpy(mxGetPr(plhs[0]), data, sizeof(double)); 

}

}

The header file:

/*MatlabGateway.h*/

#ifndef __MATLABINTERFACE_H

#define __MATLABINTERFACE_H

#include "mclmcr.h"

extern "C" void testbugfunc(int nlhs, mxArray *plhs[], int nrhs,

                   const mxArray *prhs[]);

#endif

Create a MatlabGateway.exports file with the following line in it:

testbugfunc

Build the DLL in MATLAB:

mbuild MatlabGateway.cpp MatlabGateway.exports

Load the resulting DLL-file using the Generic DLL interface:

loadlibrary('MatlabGateway.dll','MatlabGateway.h')

You can verify that you can use this method with:

methodsview MatlabGateway