Sorry here's some example code 
#! c:/perl/bin/perl;

use strict;
use warnings;

#=======================
# Define VARS
# ======================
my $RECORD_SIZE = 40;
my $ID               = 0;
my $size             = 20;              # Num of Bytes to read from fi
+le
my $offset           = 0;               # Offset to file reading.
my $MASK             = 'H4C3H4b12H4';
my $file             = "FileName";

open( FILE, $file  ) || die print "Can not open file";    # open file
binmode FILE;    # Turn on Binary mode

# Read Header for the record.
while ( sysread( FILE, $data, $size) ){                #Filehandle,str
+ing,length,offset
 
    my ($flag,$format,$blocks,$source,$no,$time,$type) = unpack $MASK,
+ $data;
    print "Header: $flag\n";
    print "Header Data:",unpack $MASK, $data;
    print "\n";
  
# Check integity of the header.
   if ( $flag != 1234 ) {
      die print "Ill formed header. File may be corrupt.";
    
# Read the remainder of the record.  
    $size = ( ( $RECORD_SIZE * $blocks ) - 20 );
    sysread( FILE, $data, $size );    #Filehandle,string,length,offset

# Debugging stuff to match Hex editor to file to determine what is goi
+ng on. 
    my $long = length($data);
    print "Size of Data portion of record: $long \n";
    my $temp = "H" . $long;
    #print $temp;
    my $alldata = unpack $temp, $data;
    print "Data: $alldata\n";

}
close FILE;

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In reply to Re: Reading Binary file confusion by Anonymous Monk
in thread Reading Binary file confusion by Anonymous Monk

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