mex, error C3861: "mxGetDoubles": Cannot find the identifier, "mxGetUint8s": Cannot find the identifier ？

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cui,xingxing 2020-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/601660-mex-error-c3861-mxgetdoubles-cannot-find-the-identifier-mxgetuint8s-cannot-find-the-identif

编辑： James Tursa 2020-9-29

When I write the .cpp file and want to generate the .mexw64 library file, I use the mex function to compile, and an error C3861: "mxGetDoubles": identifier not found, "mxGetUint8s": identifier not found, but I can use the "mxGetPr" function to compile .cpp files for normal mex. I am using MATLAB2020b version. According to the help document, the official recommendation is to use mxGetDoubles or mxGetUint8s function instead of mxGetPr function. When I use the mxGetUint8s function to get the output *plhs[] data pointer, the compiler reported the above error, and I found the definition of mxGetUint8s in "matrix.h", and it has been included correctly. Why can't I find the identifier?

#include "mex.h"
#include "matrix.h"
#include "opencv2/opencv.hpp"
...Omit code
mxUint8 *temp,*temp2
temp = (mxUint8*)mxGetUint8s(plhs[0]); // error C3861: "mxGetUint8s": Cannot find the identifier. or "mxGetDoubles" ,use "mxGetPr" instead is OK!
temp2 = (mxUint8*)mxGetUint8s(plhs[1]);
...Omit code
    