MATLAB: Can I pass a pointer to a C struct to a C/C++ library created with MATLAB compiler

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Can I pass a pointer to a C struct to a C/C++ library created with MATLAB Compiler SDK?

Best Answer

It is is not possible to pass a pointer to a native C structure directly to a compiled MATLAB function.

Data sent to your compiled MATLAB function has to be in a format MATLAB understands; MATLAB cannot use pointers to C structs.

If you are integrating your library into a C++ application you will need to create instances of 'mwArray' for each of your inputs to the compiled MATLAB function. The mwArrays are then passed by reference to your MATLAB shared library function. This requires copying fields from your C structures into MATLAB structures. For more information, refer to the following link:

https://www.mathworks.com/help/releases/R2017b/compiler_sdk/cxx/integrate-a-cc-shared-library-into-an-application.html

If you create are integrating your library into a C application you will need to create mxArrays and pass pointers to the mxArrays to the compiled MATLAB function. This requires copying fields from your C structures into MATLAB structures. For more information, refer to the following documentation:

https://www.mathworks.com/help/releases/R2017b/compiler_sdk/cxx/calling-a-shared-library.html

Related Solutions

MATLAB: MATLAB to C/C++

You can use MATLAB Compiler to deploy your application to a standalone executable. You can then give this to anyone and they can run it without MATLAB installed (though they will have to install the free MCR).

Alternatively, you can use MATLAB Coder to generate portable C-code from your MATLAB algorithm.

MATLAB: Does mxCreateNumericArray returning NULL in the C code which uses libraries compiled using MATLAB Compiler SDK

The reason why mxCreateNumericArray returns NULL is because MCR is not initialized in Windows application C code.

In order to make it work, call the 'mclInitializeApplication' routine. Make sure that the application was initialized properly by checking the return status.

This initialization has to be done before calling any MATLAB APIs or MATLAB Compiler SDK generated shared library functions.

if( !mclInitializeApplication(NULL,0) )
    {
        fprintf(stderr, "Could not initialize the application.\n");
        return -1;
    }

The following document explains step-by-step guide to integrate a C shared library into a Windows Application-

https://www.mathworks.com/help/compiler_sdk/cxx/integrate-a-c-shared-library-into-an-application.html

Best Answer

Related Solutions

MATLAB: MATLAB to C/C++

MATLAB: Does mxCreateNumericArray returning NULL in the C code which uses libraries compiled using MATLAB Compiler SDK

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