NAME

     Mat_VarReadNextInfo — Reads the information for the next variable in a MATLAB MAT file.

SYNOPSIS

     #include <matio.h>

     matvar_t *
     Mat_VarReadNextInfo(mat_t *matfp);

DESCRIPTION

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

RETURN VALUES

     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.

EXAMPLES

     This example program opens a MAT file named by the first argument to the program, and uses
     Mat_VarReadNextInfo() to read the information about each variable in the file.  For each
     variable read, the name, size, and class are printed in a format similar to the MATLAB whos
     command.

     #include <stdlib.h>
     #include <stdio.h>
     #include "matio.h"

     static char *mxclass[17] = {"cell", "struct", "object", "char", "sparse",
                                 "double", "single", "int8", "uint8", "int16",
                                 "uint16", "int32", "uint32", "int64", "uint64",
                                 "function", "opaque"
                                };

     int
     main(int argc, char **argv)
     {
         mat_t    *matfp;
         matvar_t *matvar;
         char size[32] = {' ',};

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

         printf("%-20s       %-10s     %-10s     %-18s0, "Name", "Size",
                "Bytes", "Class");
         while ( NULL != (matvar = Mat_VarReadNextInfo(matfp)) ) {
             printf("%-20s", matvar->name);
             if ( matvar->rank > 0 ) {
                 int cnt = 0;
                 int i;
                 printf("%8d", matvar->dims[0]);
                 for ( i = 1; i < matvar->rank; i++ ) {
                     if ( ceil(log10(matvar->dims[i])) + 1 < 32 )
                         cnt += sprintf(size + cnt, "x%d", matvar->dims[i]);
                 }
                 printf("%-10s", size);
             } else {
                 printf("                    ");
             }
             printf("  %-18s0, mxclass[matvar->class_type - 1]);

             Mat_VarFree(matvar);
         }

         Mat_Close(matfp);
         return EXIT_SUCCESS;
     }

SEE ALSO

     Mat_VarRead(3), Mat_VarReadInfo(3), Mat_VarReadNext(3)