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
*mat);
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[16] = {"cell", "struct", "object","char","sparse",
"double","single","int8", "uint8","int16","uint16",
"int32","uint32","int64","uint64","function"
};
int
main(int argc,char **argv)
{
mat_t *matfp;
matvar_t *matvar;
size_t nbytes;
int i;
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;
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_VarReadNextInfo(3),