File: Mat_VarReadNext.3

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.\" Copyright (c) 2011 Christopher C. Hulbert
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY CHRISTOPHER C. HULBERT ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL CHRISTOPHER C. HULBERT OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd April 21, 2011
.Dt MAT_VARREADNEXT 3
.Os
.Sh NAME
.Nm Mat_VarReadNext
.Nd Reads the information and data for the next variable in a MATLAB MAT file.
.Sh SYNOPSIS
.Fd #include <matio.h>
.Ft matvar_t *
.Fo Mat_VarReadNext
.Fa "mat_t *mat"
.Fc
.Sh DESCRIPTION
The
.Fn Mat_VarReadNext
function reads the information and data for the next variable stored in the
open MAT file.
.Sh 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.
.Sh EXAMPLES
This example program opens a MAT file named by the first argument to the
program, and uses
.Fn Mat_VarReadNext
to read each variable in the file. For each variable read, the
.Xr Mat_VarPrint 3
function is used to display the information and data of the variable.
.Bd -literal
#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 %s\n",argv[1]);
        return EXIT_FAILURE;
    }

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

    Mat_Close(matfp);
    return EXIT_SUCCESS;
}
.Ed
.Sh SEE ALSO
.Xr Mat_VarRead 3 ,
.Xr Mat_VarReadNextInfo 3 ,