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URGENT !! Files and Hexadecmial values

Posted on 2004-04-23
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Last Modified: 2010-03-04
I would like to read any standard ascii file (wether it be a compiled program, image, or text file) and convert it to the actual 'Hex' value.

IE: --
Text string: My name is Slim ;)
# would convert to
Hex value: 4D-79-20-6E-61-6D-65-20-69-73-20-53-6C-69-6D-20-3B-29
# and back to ascii again


Is there any easy way to do this? Maybe a module from cpan, or even better, a built in module ?  I'm experimenting with Perl/Tk I want to make my own version of 'Notepad' because the WindowsXP version is annoying ;)

-- Austin
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Question by:Teh_Craze
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5 Comments
 
LVL 12

Expert Comment

by:stefan73
ID: 10900153
Hi Teh_Craze,
convert a byte value to hex:
$hexbyte = sprintf "%02x", $byte;

...and back:

$number = hex("f7");

Cheers,
Stefan
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LVL 8

Expert Comment

by:davorg
ID: 10900223
Use "pack" and "unpack".

#!/usr/bin/perl
                                                                               
use strict;
use warnings;
                                                                               
my $txt = 'My name is Slim ;)';
                                                                               
my $hex = unpack 'H*', $txt;
                                                                               
print "$hex\n";
                                                                               
my $asc = pack 'H*', $hex;
                                                                               
print "$asc\n";


Dave...
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LVL 12

Expert Comment

by:stefan73
ID: 10900342
Dave,

How to include the dashes in the hex output?

Stefan
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LVL 8

Accepted Solution

by:
davorg earned 500 total points
ID: 10900380
#!/usr/bin/perl
                                                                               
use strict;
use warnings;
                                                                               
my $txt = 'My name is Slim ;)';
                                                                               
my $hex = unpack 'H*', $txt;
                                                                               
print join '-', $hex =~ /(..)/g;
print "\n";
                                                                               
my $asc = pack 'H*', $hex;
                                                                               
print "$asc\n";
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Author Comment

by:Teh_Craze
ID: 10906875
Brilliant 'davorg'. That was the exact thing I wanted. Thanks. ;)
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