passing unicode string from C mex function to Matlab

2013 4 9
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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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Friedrich
Friedrich 2013-4-9
编辑：Friedrich 2013-4-9

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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]
}

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Christian
Christian 2013-4-9
Friedrich, this works. I am able to pass my unicode characters to Matlab now. Thank you very much.
Jan
Jan 2013-4-9
@Christian: Did you try this with non-ASCII values? The conversion from UTF-8 should actually fail tremendously with this method.

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