OpenEuphoria

Re: Eu2.1: get_key(): how know when RELEASED

• Posted by "Hawke'" <mikedeland at NETZERO.NET> Aug 26, 2000
• 443 views

from keyread.e in the archive:
-- Here's an extremely useful library routine for reading the keyboard.
-- It is used just like get_key(), except that it's called get_keys(),
-- it returns a sequence instead of an atom, and the values returned are
-- scan codes, instead of ASCII codes.
-- The advantage is that the routine will recognize multiple keypresses
-- at the same time, and return them in one sequence.
-- Also, there is no repeat delay, instead the code is returned constantly
-- until the key is released.
-- Finally, the routine is also some 10-20 times faster than get_key()
-- Regards,
--                 Michael Bolin
--                 June 1997
hope this helps, Hawke'
----- Original Message -----
From: irv <irv at ELLIJAY.COM>
To: <EUPHORIA at LISTSERV.MUOHIO.EDU>
Sent: Saturday, August 26, 2000 2:26 PM
Subject: Re: Eu2.1: get_key(): how know when RELEASED


> On Sat, 26 Aug 2000, Dan wrote:
> > Anyone know how I can tell when a key is RELEASED?  As far as I can
tell,
> > get_key returns a bunch of -1's even when a key IS pressed, and tosses
in
> > the actual key pressed every once and a while;  it does that fast enough
&
> > often enough to allow "if get_key() != -1" to pick up the sporadic
instance
> > of not -1 when it occurs, but makes an  "else =-1" not able to signify
no
> > key pressed, because of all the -1's spit out along even when an actual
key
> > is pressed.
> >
> > Am I misunderstanding something here?
>
> Only in that the key _isn't_ pressed, even if you're sitting on it, if you
have
> keyboard repeat turned on. The repeat function "releases" and "presses"
the key
> a few times a second as long as you hold the key down.
>
> That's why you get the key val, followed by -1's, then the key, etc.
>
> I think (someone will correct me if I'm wrong) you'll have to go to a
lower
> level (dos interrupts) to get a key-release code. Will that work without
> turning off the auto-repeat ?
>
> Irv
>


____________NetZero Free Internet Access and Email_________
Download Now     http://www.netzero.net/download/index.html
Request a CDROM  1-800-333-3633
___________________________________________________________