Re: Non blocking keyboard
Good work! thanks for your sharing. ;)
On Fri, Oct 14, 2011 at 7:37 AM, Barry Brevik wrote:
> Last week I had posted a query about getting keyboard input in a non
> blocking way.
>
> I received several replies, so I thought I would post back the code I
> developed which seems to work.
>
> This is not the code I will end up using; it is more like a proof of
> concept program.
>
> use strict;
> use warnings;
> use Win32::Console;
>
> my $signame = '';
> my $havebrk = 0;
>
> $SIG{INT} = sub {$signame = $_[0]; $havebrk = 1;};# CTRL-C.
> $SIG{BREAK} = sub {$signame = $_[0]; $havebrk = 1;};# CTRL-BREAK,
> CTRL-ScrollLock.
>
> my $STDIN = new Win32::Console(STD_INPUT_HANDLE);
> $STDIN -> Mode(ENABLE_PROCESSED_INPUT);
>
> while (1)
> {
> if ($STDIN->GetEvents())
> {
># We do this inner loop here to make shure that we read
># all of the characters in the key buffer.
>while ($STDIN->GetEvents())
>{
># Read console event.
>my @input = $STDIN->Input();
>
> # input[0] is the event type- 1 for keyboard, 2 for mouse. So what
> is 0 for?
>if (defined $input[0] and $input[0] == 1)
> {
>my ($eventType, $keyState, $keyCount, $keyCode, $scanCode,
> $keyValue, $keyFlags) = @input;
>
>if ($havebrk) {die "User termination on signal $signame.\n\n";}
>
># KeyState of 1 means key down.
>if ($keyState == 1)
>{
> if ($keyValue == 0x00)
> {
># Most control keys fall in here.
>if ($keyCode == 16) {print "\nSHIFT key pressed.\n";}
>if ($keyCode == 17) {print "\nCTRL key pressed.\n";}
>if ($keyCode == 18) {print "\nALT key pressed.\n";}
>if ($keyCode == 19) {print "\nBREAK key pressed.\n";}
>if ($keyCode == 20) {print "\nCAPS LOCK key pressed.\n";}
>if ($keyCode == 33) {print "\nPG UP key pressed.\n";}
>if ($keyCode == 34) {print "\nPG DN key pressed.\n";}
>if ($keyCode == 35) {print "\nEND key pressed.\n";}
>if ($keyCode == 36) {print "\nHOME key pressed.\n";}
>if ($keyCode == 37) {print "\nLEFT ARROW key pressed.\n";}
>if ($keyCode == 38) {print "\nUP ARROW key pressed.\n";}
>if ($keyCode == 39) {print "\nRIGHT ARROW key pressed.\n";}
>if ($keyCode == 40) {print "\nDOWN ARROW key pressed.\n";}
>if ($keyCode == 45) {print "\nINS key pressed.\n";}
>if ($keyCode == 46) {print "\nDEL key pressed.\n";}
>if ($keyCode == 91) {print "\nLEFT WINDOWS key
> pressed.\n";}
>if ($keyCode == 92) {print "\nRIGHT WINDOWS key
> pressed.\n";}
>if ($keyCode == 93) {print "\nCONTEXT key pressed.\n";}
>if ($keyCode == 112) {print "\nF1 pressed.\n";}
>if ($keyCode == 113) {print "\nF2 pressed.\n";}
>if ($keyCode == 114) {print "\nF3 pressed.\n";}
>if ($keyCode == 115) {print "\nF4 pressed.\n";}
>if ($keyCode == 116) {print "\nF5 pressed.\n";}
>if ($keyCode == 117) {print "\nF6 pressed.\n";}
>if ($keyCode == 118) {print "\nF7 pressed.\n";}
>if ($keyCode == 119) {print "\nF8 pressed.\n";}
>if ($keyCode == 120) {print "\nF9 pressed.\n";}
>if ($keyCode == 121) {print "\nF10 pressed.\n";}
>if ($keyCode == 122) {print "\nF11 pressed.\n";}
>if ($keyCode == 123) {print "\nF12 pressed.\n";}
>if ($keyCode == 144) {print "\nNUM LOCK pressed.\n";}
>if ($keyCode == 145) {print "\nSCROLL LOCK pressed.\n";}
> }
>
> elsif ($keyValue >= 0x7f)
> {
># High line draw chars etc fall in here, however
># I was never able to get it to trigger.
>print "High char pressed.\n";
> }
>
> else
> {
># *Almost* Everything else is a printable ASCII character.
>if($keyValue == 8) {print "BACKSPACE key pressed.\n";}
>elsif ($keyValue == 9) {print "TAB key pressed.\n";}
>elsif ($keyValue == 13) {print "ENTER key pressed.\n";}
>elsif ($keyValue == 27) {print "ESC key pressed.\n";}
>else
>{
> # When here, presumably a printable character has been
> pressed.
> my $keyChr = chr($keyValue);
> print "\nChar pressed: $keyChr\n";
>}
> }
>}
>
># KeyState of 0 means that a key was released.
>elsif ($keyState == 0)
>{
> if ($keyValue == 0x00)
> {
>if ($keyCode == 16) {print "SHIFT key released.\n\n";}
>if ($keyCode == 17) {print "CTRL key released.\n\n";}
>if ($keyCode == 18) {print "ALT key released.\n\n";}
>if ($keyCode == 19) {print "BREAK key released.\n\n";}
>if ($keyCode == 20) {print "CAPS LOCK key released.\n\n";}
>
RE: Non-blocking keyboard?
I want to thank those who responded; it was all good advice. It turns out that what I was looking for was GetEvents. I really need to pay more attention to the module docs. > > I think you wanted to call PeekInput() instead of Input() here. > > But GetEvents() may be even better if you only want to see if > there are waiting keyboard events at all. > > Cheers, > -Jan ___ Perl-Win32-Users mailing list Perl-Win32-Users@listserv.ActiveState.com To unsubscribe: http://listserv.ActiveState.com/mailman/mysubs
RE: Non-blocking keyboard?
On Fri, 07 Oct 2011, Barry Brevik wrote:
> I'm writing a program where a process runs in a loop. I want to
> process keyboard input without disturbing the main process in the
> loop. I'm trying to use the Win32::Console module for this task (see
> code below), but the module blocks on the Input statement.
>
> Is there some way to make this non-blocking, or maybe even use a
> different technique entirely that does not block? I tried whipping an
> IOCTL statement on it, but I either did it wrong, or it does not work.
>
> use strict;
> use warnings;
> use Win32::Console;
>
> my $STDIN = new Win32::Console(STD_INPUT_HANDLE);
> $STDIN->Mode(ENABLE_PROCESSED_INPUT);
>
> # Un-buffer STDOUT.
> select((select(STDOUT), $| = 1)[0]);
>
> while (1)
> {
> my @input = $STDIN->Input();
I think you wanted to call PeekInput() instead of Input() here.
But GetEvents() may be even better if you only want to see if there
are waiting keyboard events at all.
> if (defined $input[0] and $input[0] == 1)
> {
> if ($input[1])
> {
> last if $input[5] == 27; # ESC key.
> if ($input[5] == 8) {print "\x08", ' ', "\x08"; next;} #
> Backspace key.
> print chr($input[5]);
> }
> }
> }
Cheers,
-Jan
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RE: Non-blocking keyboard?
Hi,
I also thought of Term::ReadKey and gave it a shot, but it reports that
non-blocking mode does not work under windows.
Also looked at the 'select' statement, but that appears to only work for
sockets under windows.
Ken
> From: perl-win32-users-boun...@listserv.activestate.com [mailto:perl-
> win32-users-boun...@listserv.activestate.com] On Behalf Of JONES,
> ROBERT E CTR USAF AETC TTMS/TTMS
> Sent: Friday, October 07, 2011 1:06 PM
> To: Barry Brevik; perl-win32-users@listserv.activestate.com
> Subject: RE: Non-blocking keyboard?
>
>
> You might want to look into the Term::Readkey module.
>
>
> Robert Jones, BSP, BSCS
> Keesler AFB
>
> -Original Message-
> From: perl-win32-users-boun...@listserv.activestate.com [mailto:perl-
> win32-users-boun...@listserv.activestate.com] On Behalf Of Barry Brevik
> Sent: Friday, October 07, 2011 11:46 AM
> To: perl-win32-users@listserv.activestate.com
> Subject: Non-blocking keyboard?
>
> I'm writing a program where a process runs in a loop. I want to process
> keyboard input without disturbing the main process in the loop. I'm
> trying to use the Win32::Console module for this task (see code below),
> but the module blocks on the Input statement.
>
> Is there some way to make this non-blocking, or maybe even use a
> different technique entirely that does not block? I tried whipping an
> IOCTL statement on it, but I either did it wrong, or it does not work.
>
> use strict;
> use warnings;
> use Win32::Console;
>
> my $STDIN = new Win32::Console(STD_INPUT_HANDLE);
> $STDIN->Mode(ENABLE_PROCESSED_INPUT);
>
> # Un-buffer STDOUT.
> select((select(STDOUT), $| = 1)[0]);
>
> while (1)
> {
> my @input = $STDIN->Input();
> if (defined $input[0] and $input[0] == 1)
> {
> if ($input[1])
> {
> last if $input[5] == 27; # ESC key.
> if ($input[5] == 8) {print "\x08", ' ', "\x08"; next;} #
> Backspace key.
> print chr($input[5]);
> }
> }
> }
>
> As an aside, I think we need to get more traffic on this list somehow.
>
> Barry Brevik
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RE: Non-blocking keyboard?
You might want to look into the Term::Readkey module.
Robert Jones, BSP, BSCS
Keesler AFB
-Original Message-
From: perl-win32-users-boun...@listserv.activestate.com
[mailto:perl-win32-users-boun...@listserv.activestate.com] On Behalf Of Barry
Brevik
Sent: Friday, October 07, 2011 11:46 AM
To: perl-win32-users@listserv.activestate.com
Subject: Non-blocking keyboard?
I'm writing a program where a process runs in a loop. I want to process
keyboard input without disturbing the main process in the loop. I'm
trying to use the Win32::Console module for this task (see code below),
but the module blocks on the Input statement.
Is there some way to make this non-blocking, or maybe even use a
different technique entirely that does not block? I tried whipping an
IOCTL statement on it, but I either did it wrong, or it does not work.
use strict;
use warnings;
use Win32::Console;
my $STDIN = new Win32::Console(STD_INPUT_HANDLE);
$STDIN->Mode(ENABLE_PROCESSED_INPUT);
# Un-buffer STDOUT.
select((select(STDOUT), $| = 1)[0]);
while (1)
{
my @input = $STDIN->Input();
if (defined $input[0] and $input[0] == 1)
{
if ($input[1])
{
last if $input[5] == 27; # ESC key.
if ($input[5] == 8) {print "\x08", ' ', "\x08"; next;} #
Backspace key.
print chr($input[5]);
}
}
}
As an aside, I think we need to get more traffic on this list somehow.
Barry Brevik
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