Accessing an mxarray when using codeGen to convert Matlab DLL to mex

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Ajay Kumar 2016-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/273721-accessing-an-mxarray-when-using-codegen-to-convert-matlab-dll-to-mex

编辑： Ajay Kumar 2016-3-18

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Hello!

I have a *.DLL that performs some data modification on a vector:

calllib( 'DLL64', 'CPP', pX, pY)

Where pX and pY are pointers to the input and output respectively.

In order to grab the data from pY, I had initially used:

    for n = 0:outLen-1
        pYn = pY + n;
        outVal(1+n, 1) = pYn.value;
    end

When I run this through the codeGen, I had an issue with pointer increment:

??? Integers can only be combined with integers of the same class, or scalar doubles.

Turns out that pX is a mxArray. I am certain that I am reading this incorrectly. But, gave it a shot anyway:

I added a coder.extrinsic

coder.extrinsic('mxGetData');

Then I attempted to collect the data as follows:

        if coder.target('MATLAB')
            for n=0:outLen-1
                pYn = pY + n;
                outVal(1+n, 1) = pYn.value;
            end
        else
            outVal = zeros(outLen-1, 1);
            outVal = mxGetData(pY);
        end