passing unicode string from C mex function to Matlab

Question

Christian 2013-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/71173-passing-unicode-string-from-c-mex-function-to-matlab

Hello, I need to send a unicode string from my C mex function to Matlab. At the moment, I try to use mxCreateString to create the variable to return, but unfortunately, I do not get the correct string in Matlab. The string in my C mex function is UTF8 encoded. As far as I can see, the mxCreateString takes a char* only. Does this mean, that mxCreateString can not handle unicode strings? Is there any other way to return unicode strings to Matlab?

Am I correct that Matlab itself uses UTF16 to store strings?

Thank you in advance,

Christian

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Answer 1

Friedrich 2013-4-9

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编辑：Friedrich 2013-4-9

在 MATLAB Online 中打开

Hi,

at least the doc states that the mxChar type is 2 byte:

http://www.mathworks.com/help/matlab/apiref/mxchar.html

What happens when you use mxCreateCharArray together with a mxGetData and a memcopy? Or you use a loop to write the data in and cast accordingly?

mxArry *tmp = mxCreateCharArray(...)
mxChar *charData = (mxChar *)mxGetData(tmp);
        for(j=0; j < nelem_tmp; j++) {
                  charData[j] = (mxChar)Your_string[j]
}