MATLAB Application Program Interface Reference

True if a string mxArray

#include "matrix.h"
bool mxIsChar(const mxArray *array_ptr);

Arguments

array_ptr

Pointer to an mxArray.

Returns

true if array_ptr points to an array having the class mxCHAR_CLASS; otherwise, returns false.

Description

Use mxIsChar to determine if array_ptr points to string mxArray.

Calling mxIsChar is equivalent to calling

mxGetClassID(array_ptr) == mxCHAR_CLASS

Example

Consider a MEX-file that expects its first input argument to be a string mxArray. If it is not a string mxArray, the MEX-file issues an error message.

void
mexFunction(int nlhs,mxArray *plhs[],int nrhs,const mxArray 
*prhs[])
{
 if (mxIsChar(prhs[0])) {
   /* ... Yes, it is a string mxArray. */  
 }
 else /* No, this is not a string array. */ 
   mexErrMsgTxt("You must specify a string array");
}

For an additional example, see mxIsChar.c in the mx subdirectory of the examples directory.