Convert C++ Engine Application to MATLAB Compiler SDK Application

You can deploy an engine application by modifying your code to use the MATLAB^® Compiler SDK™ API. For information about this API, see Deploy to C++ Applications Using MATLAB Data API (C++11) (MATLAB Compiler SDK). Make these modifications to use the equivalent Compiler SDK C++ values:

• Header file

  MatlabCppSharedLib.hpp

• Namespace

  matlab::cpplib

• Class name

  matlab::cpplib::MATLABApplication

• Compiler SDK requires the path of CTF (library archive file) to be set. For example:

  const std::u16string U16STR_CTF_NAME = u"libtriangle.ctf";
  auto lib = mc::initMatlabLibrary(app, U16STR_CTF_NAME);

Applications to Call Sierpinski Function

This example is an engine application that calls a MATLAB function sierpinski which calculates the points in Sierpinski's triangle. The example shows how to modify the engine code to run with MATLAB Compiler SDK.

If you have Compiler SDK, then you can use the graphical Sierpinski function sierpinski.m in the matlabroot/extern/examples/compilersdk/c_cpp/triangle folder.

Copy this code into the file triangleEngine.cpp.

 Engine Application triangleEngine.cpp

/*==============================================================
 *
 * triangleEngine.cpp
 * 
 * MATLAB Engine API for C++ application
 *============================================================*/

#include "MatlabEngine.hpp"
#include <iostream>

namespace mc = matlab::engine;
namespace md = matlab::data;

const int DEFAULT_NUMBER_OF_POINTS = 1000;
std::u16string convertAsciiToUtf16(const std::string & asciiStr);

int mainFunc(std::shared_ptr<mc::MATLABEngine> app,
    const int argc, const char * argv[]) {
    try {
        size_t numPoints(DEFAULT_NUMBER_OF_POINTS);
        if(argc > 1) {
            numPoints = std::stoi(argv[1]);
        }
 
        // Create arguments as input of the MATLAB function
        md::ArrayFactory factory;
        matlab::data::TypedArray<size_t> numPointsAsArray = factory.createScalar(numPoints);
        matlab::data::TypedArray<bool> doDrawAsArray = factory.createScalar(doDraw); // create a logical scalar
        std::vector<md::Array> inputs{numPointsAsArray, doDrawAsArray};

        // The Sierpinski function returns the X and Y coordinates of the points
        // in the triangle. If doDraw is true, it also draws the figure.
        app->feval(u"sierpinski", 2, inputs);

        // Wait until the user closes the figure.
        app->eval(u"figures = findobj(allchild(groot),'flat','type','figure','visible','on'); 
            waitfor(figures(1))");
                
    } catch(std::exception & exc) {
        std::cerr << exc.what() << std::endl;
        return -1;
    }
    return 0;
}

int main(const int argc, const char * argv[]) {
    int ret = 0;
    try {
        
        std::vector<std::u16string> options = {};
        std::unique_ptr<MATLABEngine> matlabApplication = mc::connectMATLAB();//startMATLAB();
        ret = mainFunc(std::move(matlabApplication), argc, argv);
    } catch(const std::exception & exc) {
        std::cerr << exc.what() << std::endl;
        return -1;
    }
    return ret;
}

Modify the code to use the equivalent Compiler SDK C++ values.

If you copy the following code into triangleSDK.cpp and compare the file with triangleEngine.cpp, then you can see other modifications relevant to calling the Sierpinski function.

 Corresponding Deployed Application triangleSDK.cpp

/*==============================================================
 *
 * triangleSDK.cpp
 * Use the generic interface for the C++ shared library
 * generated by MATLAB Compiler SDK.
 *============================================================*/

#include "MatlabCppSharedLib.hpp"
#include <iomanip>
#include <iostream>

namespace mc = matlab::cpplib;
namespace md = matlab::data;

const int DEFAULT_NUMBER_OF_POINTS = 1000;


int mainFunc(std::shared_ptr<mc::MATLABApplication> app,
    const int argc, const char * argv[]) {
    try {
        size_t numPoints(DEFAULT_NUMBER_OF_POINTS);
        if(argc > 1) {
            numPoints = std::stoi(argv[1]);
        }
        // Pass the path of the CTF (library archive file) to initMATLABL ibrary
        const std::u16string U16STR_CTF_NAME = u"libtriangle.ctf";
        auto lib = mc::initMATLABLibrary(app, U16STR_CTF_NAME);
        
        // Create arguments as input of the MATLAB functio
        md::ArrayFactory factory;
        matlab::data::TypedArray<size_t>. numPointsAsArray = factory.createScalar(numPoints);
        matlab::data::TypedArray<bool> doDrawAsArray = factory.createScalar(doDraw); // create a logical scalar
        std::vector<md::Array> inputs{numPointsAsArray, doDrawAsArray};

        // The Sierpinski function returns the X and Y coordinates of the points
        // in the triangle. If doDraw is true, it also draws the figure.
        lib->feval(u"sierpinski", 2, inputs);

        // Wait until the user closes the figure.
        lib->waitForFiguresToClose();

        
    } catch(std::exception & exc) {
        std::cerr << exc.what() << std::endl;
        return -1;
    }
    return 0;
}

int main(const int argc, const char * argv[]) {
    int ret = 0;
    try {
        matlab::cpplib::MATLABApplicationMode mode = mc::MATLABApplicationMode::IN_PROCESS;
        std::vector<std::u16string> options = {};
        std::shared_ptr<matlab::cpplib::MATLABApplication> matlabApplication = mc::initMATLABApplication(mode, options);

        ret = mc::runMain(mainFunc, std::move(matlabApplication), argc, argv);
    } catch(const std::exception & exc) {
        std::cerr << exc.what() << std::endl;
        return -1;
    }
    return ret;
}

Related Topics

• Deploy to C++ Applications Using MATLAB Data API (C++11) (MATLAB Compiler SDK)
• Requirements to Build C++ Engine Applications