mexPrintf to standard error

Is it possible to direct the output of mexPrintf to standard error? I'd like something like in Matlab where you can do fprintf(2,...) to print out error code.

[James Tursa]

Do you mean dynamically redirect all mexPrintf output at runtime? I.e., used to go to screen but now goes to standard error?

[Jim Hokanson]

I am looking for a command that works like fprintf(2,...) (Matlab) but for mex. Something that prints to the Matlab command window, but in red, rather than in black.

Answer 1

[James Tursa]

Brute force? I can't think of another way to get at the MATLAB standard error printing. E.g.,

/* Includes ----------------------------------------------------------- */

#include "mex.h"
#include <stdio.h>

/* Global variables --------------------------------------------------- */

      char s[2000];
      mxArray *rhs[2];

/* Functions ---------------------------------------------------------- */

void mexPrintf2(char *s)
{
    rhs[1] = mxCreateString(s);
    mexCallMATLAB(0,NULL,2,rhs,"fprintf");
    mxDestroyArray(rhs[1]);
}

/* Gateway ------------------------------------------------------------ */

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    rhs[0] = mxCreateDoubleScalar(2.0);
    sprintf(s,"This is a test\nThis is only a test\nIn an actual emergency ...\n");
    mexPrintf2(s);
    sprintf(s,"The number %d + %d = %d\n",1,2,1+2);
    mexPrintf2(s);
    mxDestroyArray(rhs[0]);
}

[Jim Hokanson]

:) Ha, why not.