Re: help abut function keys

Re: help abut function keys

[Jerry van Dijk]

jtapasai@my-dejanews.com wrote:
: I am learning ADA with GNAT 3.10 under Linux and my problem is :

: I usually used a function that returns an integer wich is the ASCII code
: of the pressed key. When the code is returned , I use a case when ...
: However, the F-keys have an special code.
: For example, F1 is ^]]A wich is 91 27 27 65 or something similar .

The 'special' key's on a PC's keyboard have no ansi code. Also, since
you are using linux, there is not even a garantee that the keyboard
used is in fact a PC keyboard. I'm writing this on a VT220 clone.

Assuming you can be sure your program will only run on a PC console
you can either use nested case statements to filter out the proper
keys, or write your own keyboard input function using your own
keyboard code type.

Jerry.
-- 
-- Jerry van Dijk  | email: jdijk@acm.org
-- Leiden, Holland | member Team-Ada
-- Ada & Win32: http://stad.dsl.nl/~jvandyk

help abut function keys

[jtapasai]

I am learning ADA with GNAT 3.10 under Linux and my problem is :
I have a menu with different options. Each option is executed when
a key is pressed. My problem us that those keys are necessarily
"special keys", such as function keys ( F1-F12);

I usually used a function that returns an integer wich is the ASCII code
of the pressed key. When the code is returned , I use a case when ...
However, the F-keys have an special code.
For example, F1 is ^]]A wich is 91 27 27 65 or something similar .
How can I solve it ?
Thanks in advance .


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Re: help abut function keys

[Do-While Jones]

In article <6qbvh5$2un$1@nnrp1.dejanews.com>,
 <jtapasai@my-dejanews.com> wrote:
>I am learning ADA with GNAT 3.10 under Linux and my problem is :
>I have a menu with different options. Each option is executed when
>a key is pressed. My problem us that those keys are necessarily
>"special keys", such as function keys ( F1-F12);
>
>I usually used a function that returns an integer wich is the ASCII code
>of the pressed key. When the code is returned , I use a case when ...
>However, the F-keys have an special code.
>For example, F1 is ^]]A wich is 91 27 27 65 or something similar .
>How can I solve it ?
>Thanks in advance .
>

I did something like this 10 years ago for my VIRTUAL_TERMINAL package.
The body for the Meridian compiler on an IBM PC/AT is in 

ftp://www.ridgenet.net/pub/users/d/do_while/ada_in_action/disk2/
meridian/vtbmibm.ada

The "get" procedure will show you the general approach.

VIRTUAL_TERMINAL is one of the many examples from my book, Ada in Action.
You can find it at

http://www.cs.kuleuven.ac.be/~dirk/ada-belgium/aia/contents.html

I hope this helps you.

Do-While Jones

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