MATLAB: How to copy data to a new string variable in a C-MEX file

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I have created a string variable in my C-MEX file using mxCreateString. I would like to copy the content to a new string variable.

Best Answer

Use the mxArray* returned by the mxCreateString function to copy data to a new mxArray* as follows:
 #include "mex.h"
 void mexFunction( int nlhs, mxArray *plhs[],
                   int nrhs, const mxArray *prhs[] )
 {
 mxArray *origString, *userString;
 int arrayLen;
 /* Initialize */
 origString = mxCreateString("This is the primitive string");
 /* Copy values to new string */
 userString = origString;
 /* Determine array length */
 arrayLen = mxGetNumberOfElements(origString);
 printf("The array length is: %d \n", arrayLen);
 /* Remaining code is just for testing */
 plhs[0] = userString;
 return;
 }
To test the above mexFunction after building to a MEX file, for example mexFunction.mexw32, invoke:
y = mexFunction
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