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Man Pages
MAT_VARREADNEXT(3) FreeBSD Library Functions Manual MAT_VARREADNEXT(3)

Mat_VarReadNext
Reads the information and data for the next variable in a MATLAB MAT file.

#include <matio.h>

matvar_t *
Mat_VarReadNext(mat_t *matfp);

The Mat_VarReadNext() function reads the information and data for the next variable stored in the open MAT file.

If there is another variable in the MAT file and is read successfully, a pointer to the MATLAB variable structure is returned. If there are no more variables, or there was an error reading the variable, NULL is returned.

This example program opens a MAT file named by the first argument to the program, and uses Mat_VarReadNext() to read each variable in the file. For each variable read, the Mat_VarPrint(3) function is used to display the information and data of the variable.
#include <stdlib.h>
#include <stdio.h>
#include "matio.h"

int
main(int argc, char **argv)
{
    mat_t    *matfp;
    matvar_t *matvar;

    matfp = Mat_Open(argv[1], MAT_ACC_RDONLY);
    if ( NULL == matfp ) {
        fprintf(stderr, "Error opening MAT file %s0, argv[1]);
        return EXIT_FAILURE;
    }

    while ( NULL != (matvar = Mat_VarReadNext(matfp)) ) {
        Mat_VarPrint(matvar, 1);
        Mat_VarFree(matvar);
    }

    Mat_Close(matfp);
    return EXIT_SUCCESS;
}

Mat_VarRead(3), Mat_VarReadNextInfo(3), Mat_VarPrint(3)
September 12, 2019 FreeBSD 13.1-RELEASE

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