TestCreateStructArray.c

#include "mex.h"

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    mxArray* mx;
    int ndim = 2;
    int dims[] = {1, 1};
    const char *invalidFieldNames[] = { " ", "&;", "0lala", "n!" };
    int fieldCount = sizeof(invalidFieldNames)/sizeof(*invalidFieldNames);
    
    // Arguments check
    if (nrhs != 0) { mexErrMsgTxt("Must be called without input arguments."); return; }
    if (nlhs > 1) { mexErrMsgTxt("Must be called with at most 1 output argument."); return; }
    
    // Create a struct array with invalid field names
    // NB: I know this is stupid, this is just to show that field names are not tested.
    mx = mxCreateStructArray(ndim, dims, fieldCount, invalidFieldNames);
    if (mx != NULL)
    {
        mexPrintf("Oops was able to create field with invalid names and return this into matlab ...\n");
        if (nlhs > 0) { plhs[0] = mx; }
        else { mxDestroyArray(mx); }
    }
    else
    {
        mexErrMsgTxt("Cool, I'm not allowed to create struct with stupid field names.\n");
    }
}