Question

I have a file in Unicode format on a windows machine. Is there any way to convert it to ASCII format on a windows machine using perl script

It’s UTF-16 BOM.

Answer 1

If you want to convert unicode to ascii, you must be aware that some characters can’t be converted, because they just don’t exist in ascii.
If you can live with that, you can try this:

#!/usr/bin/env perl
use strict;
use warnings;
use autodie;

use open IN => ':encoding(UTF-16)';
use open OUT => ':encoding(ascii)';

my $buffer;

open(my $ifh, '<', 'utf16bom.txt');
read($ifh, $buffer, -s $ifh);
close($ifh);

open(my $ofh, '>', 'ascii.txt');
print($ofh $buffer);
close($ofh);

If you do not have autodie, just remove that line – you should then change your open/close statements with a

open(...) or die "error: $!\n";

If you have characters that can’t be converted, you will get warnings on the console and your output file will have e.g. text like

\x{00e4}\x{00f6}\x{00fc}\x{00df}

in it.
BTW: If you don’t have a mom but know it is Big Endian (Little Endian), you can change the encoding line to

use open IN => ':encoding(UTF-16BE)';

or

use open IN => ':encoding(UTF-16LE)';

Hope it works under Windows as well. I can’t give it a try right now.