I think the example in the synopsis of Term::Readkey is what you are looking for. | [reply] |
Just for sake of TMTOWTDI, you can also have a look at the -1 / -one_char option of IO::Prompt. But it's probably only Term::ReadKey ;)
Flavio
perl -ple'$_=reverse' <<<ti.xittelop@oivalf
Don't fool yourself.
| [reply]
[d/l] |
If you're on a Linux system and want to "roll your own", you might consider creating a subroutine to enter "raw" terminal mode, as in the following example. The subroutine one_key creates a closure which, each time it's called, gets the next character, but without blocking. When you're done, you can call the closure a final time with a zero argument to reset "cooked" mode (normal terminal).
#!/usr/bin/perl -w
#
# Example of getting a single, non-blocking character in Linux.
#
# 060306 liverpole
#
# Strict
use strict;
use warnings;
# Create a subroutine (closure) for capturing a key
sub one_key {
chomp(my $stty = `stty -g`); # Save 'cooked' mode t
+ty
`stty -icrnl -icanon -echo min 0 time 0`; # Begin raw mode
sub { # Create a closure
if (!$_[0]) { # If argument is zero
+...
system("stty $stty"); # restore 'cooked' m
+ode
} else { # Otherwise get and re
+turn
`dd bs=1 count=1 <&0 2>/dev/null`; # a single keystroke
}
};
}
# Main program
my $p_one_key = one_key();
while (1) {
print ' ' x int(rand(20)), "*\n";
select(undef, undef, undef, 0.1);
last if $p_one_key->(1);
}
$p_one_key->(0);
@ARGV=split//,"/:L";
map{print substr crypt($_,ord pop),2,3}qw"PerlyouC READPIPE provides"
| [reply]
[d/l] |
If you have a while loop that is spinning and you don't want to prompt the user for any key to be pressed such as with <STDIN> but to silently break out when she hits ENTER key use the following 3 line function called "keystroke()" where $j variable will change from 0 to 1 when the ENTER key is pressed:
while (true) {
...
if (&keystroke == 1) {
last;
}
...
}
sub keystroke {
$i = '';
vec($i, fileno(STDIN), 1) = 1;
$j = select ($i, undef, undef, 0);
}
| [reply] |
If you have a while loop that is spinning and you don't want to prompt the user for any key to be pressed such as with <STDIN> and you don't want to use Term:ReadKey module but to silently break out when she hits ENTER key use the following 3 line function called "keystroke()" where $j variable will change from 0 to 1 when the ENTER key is pressed:
while (true) {
...
if (&keystroke == 1) {
last;
}
...
}
sub keystroke {
$i = '';
vec($i, fileno(STDIN), 1) = 1;
$j = select ($i, undef, undef, 0);
}
| [reply] |
The following works great in windows. Shows you
what the keyboard produced, exits when you hit ENTER. Note that some keys (like arrows) produce multi-character sequences.
#!/usr/bin/perl -w
use strict;
use Term::ReadKey;
my $key;
my $OrdKey;
ReadMode 'raw';
do {
$key = ReadKey(0);
$OrdKey = ord($key);
print "Key is $OrdKey\n";
} while ($OrdKey != 13);
ReadMode 'restore';
| [reply]
[d/l] |