Is this the sort of thing you're after? 
use Term::ReadKey;

print "Press SPACE to exit\n";

ReadMode 4;

while ( 1 ) {
    my $c = ReadKey(-1);
    next unless $c;
    last if $c eq ' ';
    printf "%02x ", ord $c;
}

END {
    ReadMode 1;
}

[download]

I think Term::ReadKey works on windows.

Unless I state otherwise, all my code runs with strict and warnings

In reply to Re: How to intercept ctrl-S/ctrl-Q characters from STDIN by FunkyMonk
in thread How to intercept ctrl-S/ctrl-Q characters from STDIN by JohnBurley

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