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From: Vinicius Jose Latorre <viniciusjl@ig.com.br>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: "GNU Emacs \(devel\)" <emacs-devel@gnu.org>
Subject: Re: How to know if a key is pressed without getting it?
Date: Sun, 26 Sep 2010 20:21:46 -0300	[thread overview]
Message-ID: <4C9FD58A.4070205@ig.com.br> (raw)
In-Reply-To: <m28w2ogm1y.fsf@igel.home>


>> Does anyone know how to know if a key is pressed without getting it in
>> Emacs (like kbhit like function)?
>>      
> input-pending-p is a built-in function in `C source code'.
>
> (input-pending-p)
>
> Return t if command input is currently available with no wait.
> Actually, the value is nil only if we can be sure that no input is available;
> if there is a doubt, the value is t.
>    

Well, Óscar Fuentes also sent me an email about input-pending-p.

I defined the following function using input-pending-p:

(defun test-input ()
   (read-char "char: ")
   (while (input-pending-p)
     (insert (format "{%S}" unread-command-events)))
   (message "{%S} END" last-input-char))

Execute the function above via: M-: (test-input) RET

Then hold space key.

The only message returned is "{32} END" followed by all spaces that I 
pressed (except the first one).

So, input-pending-p does not work as kbhit function.

I'm thinking that this function is not implemented in Emacs.



  reply	other threads:[~2010-09-26 23:21 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-26 15:02 How to know if a key is pressed without getting it? Vinicius Jose Latorre
2010-09-26 15:53 ` Óscar Fuentes
2010-09-26 22:15 ` Stefan Monnier
2010-09-26 22:41   ` Vinicius Jose Latorre
2010-09-26 23:11     ` Stefan Monnier
2010-09-26 23:25       ` Lennart Borgman
2010-09-27  1:08       ` Vinicius Jose Latorre
2010-09-27 20:30         ` Stefan Monnier
2010-09-27  1:20     ` Ted Zlatanov
2010-09-26 22:46 ` Andreas Schwab
2010-09-26 23:21   ` Vinicius Jose Latorre [this message]
2010-09-26 23:36     ` Stefan Monnier
2010-09-27  0:29       ` Vinicius Jose Latorre

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