mclcppclass.h error

I built a simple shared library from a MATLAB function following this tutorial .

https://blogs.mathworks.com/loren/2011/02/03/creating-c-shared-libraries-and-dlls/

My function in MATLAB is:

function y = counting_characters(x)
    y = strlength(x);
end

After many attempts to make VS code to run it, fighting for it to detect the libraries, I went back to my old Dev C++, set the paths there, and it detected them. Yet, when I compile my program, the mclcppclass.h file (automatically generated) opens and gives these errors:

C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	In constructor 'mwArray::mwArray(const mxChar*, MWObjectType)':
115	14	C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	[Error] 'status' does not name a type
116	13	C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	[Error] 'status' was not declared in this scope
C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	In member function 'void mwArray::SetStringData(const std::vector<std::basic_string<short unsigned int> >&)':
410	14	C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	[Error] 'size' does not name a type
411	13	C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	[Error] 'size' was not declared in this scope
413	43	C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	[Error] 'size' was not declared in this scope
C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	In member function 'std::vector<std::basic_string<short unsigned int> > mwArray::GetStringData() const':
1236	81	C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	[Error] 'nullptr' was not declared in this scope
C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	In member function 'const mxChar* mwArray::GetStringElement(mwSize) const':
1247	29	C:\Program Files\MATLAB\MATLAB Runtime\v98\extern\include\mclcppclass.h	[Error] 'nullptr' was not declared in this scope

Below, I provide my C++ code (it is very basic)

#include <iostream>
#include "libcountingcharacters.h"

int ac;
const char av[]= "Hello World";

int main()
{

// Initialize the MATLAB Compiler Runtime global state
if (!mclInitializeApplication(NULL,0))
{
	std::cerr << "Could not initialize the application properly."
				<< std::endl;
	return -1;
}


// Initialize the Counting characters library
if( !libcountingcharactersInitialize() )
{
	std::cerr << "Could not initialize the library properly."
				<< std::endl;
	return -1;
}

    // Must declare all MATLAB data types after initializing the
    // application and the library, or their constructors will fail.x
    mwArray text(av[2]);
    mwArray result;
	counting_characters(1,result,text);
	    std::cout << result << std::endl;
    // Shut down the library and the application global state.
    libcountingcharactersTerminate();
    mclTerminateApplication();
}

What am I missing here? I dont have a programming background so please try to use simple explanations...

Answer 1

[Sindhu Karri]

Hii,

You can try modifying these line in your code as:

const char *av= "Hello World";

instead of

const char av[]= "Hello World";

also

mwArray text(av);

instead of

mwArray text(av[2]);

Note: Have successfully compiled in Microsoft Visual C++ 2017

Below attached link might be useful when using mwArray

https://www.mathworks.com/help/compiler_sdk/cxx/mwarray.html