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Groups > comp.sys.acorn.programmer > #1729

Re: Defining action of CTRL key...

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From Martin Wuerthner <spamtrap@mw-software.com>
Newsgroups comp.sys.acorn.programmer
Subject Re: Defining action of CTRL key...
Date Tue, 22 May 2012 18:09:48 +0200
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In message <4802cf78-e210-4afa-acf0-a751668b03bb@hq4g2000vbb.googlegro 
ups.com>
          Gazza <usenet@garethlock.com> wrote:

> As most of you know, I've been porting UMoria over to BBC BASIC bit by
> bit for the last couple of years. I'm now at the point of sorting out
> the keyboard input code. The game uses the ESCape key and various CTRL
> combinations to perform actions. I've got the ESCape key to behave
> using OS_Byte &E5 (229). Is there any way of neutering the CTRL key in
> a similar fashion so that it sets a bit, rather than performing any
> other action defined by the VDU drivers?

In contrast to Esc, the Ctrl key does not have any associated action, 
so there is no need to suppress it. You can enquire about the state of 
the Ctrl key at any time using OS_Byte 121. Whatever code you use to 
accept keyboard input might do specific things when it sees Ctrl 
keypresses, so in order to answer your question you need to tell us 
how you accept and interpret keyboard input in your program. 
OS_ReadLine, for instance, interprets certain Ctrl keypresses.

-- 
Martin
---------------------------------------------------------------------
Martin Wuerthner         MW Software      http://www.mw-software.com/
        RISC OS Software for Design, Printing and Publishing
---------------------------------------------------------------------

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Thread

Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-22 08:42 -0700
  Re: Defining action of CTRL key... Martin Wuerthner <spamtrap@mw-software.com> - 2012-05-22 18:09 +0200
    Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-22 11:33 -0700
      Re: Defining action of CTRL key... Martin Wuerthner <spamtrap@mw-software.com> - 2012-05-22 22:45 +0200
        Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-22 16:03 -0700
          Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-22 23:42 -0700
            Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-23 16:20 -0700
              Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-24 13:59 -0700
                Re: Defining action of CTRL key... Matthew Phillips <spam2011m@yahoo.co.uk> - 2012-05-24 22:51 +0100
                Re: Defining action of CTRL key... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-26 16:16 +0200
              Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-25 07:04 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-25 07:48 -0700
                Re: Defining action of CTRL key... Steve Drain <steve@kappa.me.uk> - 2012-05-25 16:30 +0100
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-27 05:43 -0700
                Re: Defining action of CTRL key... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-26 16:08 +0200
                Re: Defining action of CTRL key... Harriet Bazley <bazley@feathermail.co.uk> - 2012-06-08 08:55 +0100
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-08 01:16 -0700
            Re: Defining action of CTRL key... Martin Wuerthner <spamtrap@mw-software.com> - 2012-05-24 11:07 +0200
              Re: Defining action of CTRL key... Rick Murray <heyrickmail-usenet@yahoo.co.uk> - 2012-05-26 16:18 +0200
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-27 02:25 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-27 10:00 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-27 10:55 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-29 10:30 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-29 14:14 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-29 16:32 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-29 17:34 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-30 04:06 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-05-30 04:35 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-30 05:40 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-30 10:26 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-05-31 06:56 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-01 05:02 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-01 07:01 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-01 07:54 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-06-02 18:18 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-03 01:02 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-06-06 17:29 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-07 16:37 -0700
                Re: Defining action of CTRL key... Steve Drain <steve@kappa.me.uk> - 2012-06-08 12:00 +0100
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-08 09:00 -0700
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-11 16:14 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-06-17 17:12 -0700
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-06-18 13:24 -0700
                Re: Defining action of CTRL key... Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-06-16 20:18 +0100
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-17 16:08 -0700
                Re: Defining action of CTRL key... Jeremy Nicoll - news posts <jn.nntp.scrap007@wingsandbeaks.org.uk> - 2012-06-18 04:45 +0100
                Re: Defining action of CTRL key... Gazza <usenet@garethlock.com> - 2012-06-18 14:49 -0700
                Re: Defining action of CTRL key... druck <news@druck.org.uk> - 2012-06-18 18:41 +0100
                Re: Defining action of CTRL key... jgharston <jgh@arcade.demon.co.uk> - 2012-06-18 13:26 -0700

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