mclcppclass.h error

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Martin Alejandro Gorosito
Martin Alejandro Gorosito on 23 May 2020
Answered: Sindhu Karri on 26 May 2020
I built a simple shared library from a MATLAB function following this tutorial .
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...

Answers (1)

Sindhu Karri
Sindhu Karri on 26 May 2020
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

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