matlab转成C++

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发布于 2020-12-01 10:46:21

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发布于 2020-12-01 10:46:21

笔者在尝试将matlab转成C++时,出现error LNK2019: 无法解析的外部符号, 根据下面StackOverflow的回答解决了问题,截取分享.

source link: https://stackoverflow.com/questions/17120635/calling-matlab-from-c-errors-unresolved-external-symbol

Before you start, make sure you have a supported compiler installed. That would be Visual C++ and possibly Windows SDK if you are using VS Express edition on a 64-bit Windows. Next you need to configure MATLAB by running these steps at least once:

>> mex -setup
>> mbuild -setup

Now given the following simple function:

MyAdd.m

function c = MyAdd(a,b)
    c = a + b;
end

We want to build a C++ shared library using the MATLAB Compiler mcc:

>> mcc -N -W cpplib:libMyAdd -T link:lib MyAdd.m -v

This will produce a couple of files including a header file, a DLL, and an import library:

libMyAdd.h
libMyAdd.dll
libMyAdd.lib

Next we create a C++ program to test the above library:

MyAdd_test.cpp

#include "libMyAdd.h"

int main()
{
    // initialize MCR and lib
    if (!mclInitializeApplication(NULL,0))  {
        std::cerr << "could not initialize the application" << std::endl;
        return -1;
    }
    if(!libMyAddInitialize()) {
        std::cerr << "Could not initialize the library" << std::endl;
        return -1;
    }

    try {
        // create input
        double a[] = {1.0, 2.0, 3.0, 4.0};
        double b[] = {5.0, 6.0, 7.0, 8.0};
        mwArray in1(2, 2, mxDOUBLE_CLASS, mxREAL);
        mwArray in2(2, 2, mxDOUBLE_CLASS, mxREAL);
        in1.SetData(a, 4);
        in2.SetData(b, 4);

        // call function
        mwArray out;
        MyAdd(1, out, in1, in2);

        // show result
        std::cout << "in1 + in2 = " << std::endl;
        std::cout << out << std::endl;

        double c[4];
        out.GetData(c, 4);
        for(int i=0; i<4; i++) {
            std::cout << c[i] << " " << std::endl;
        }

    } catch (const mwException& e) {
        std::cerr << e.what() << std::endl;
        return -2;
    } catch (...) {
        std::cerr << "Unexpected error thrown" << std::endl;
        return -3;
    } 

    // cleanup
    libMyAddTerminate();   
    mclTerminateApplication();

    return 0;
}

We could compile this program right from inside MATLAB using:

>> mbuild MyAdd_test.cpp libMyAdd.lib -v
>> !MyAdd_test

We could also compile it ourselves using Visual Studio. We start by creating a native console application, then set the project settings as follows:

If you do this kind of thing often, you could create a property sheet once, which could then be reused in other VC++ projects. See this answer for an example.

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原始发表：2020-11-27 ，如有侵权请联系 cloudcommunity@tencent.com 删除

c++