keyboard polling in ADA

keyboard polling in ADA

[Matthew S Low]

I'm sorry, in my last posting for keyboard polling in Ada I forgot to
mention that I am attempting to do this using BSD UNIX. I was also asked
whether I was trying to "do something" while the program looped waiting for
a keystroke, and the answer is yes. I'm beginning to look into the areas of
interrupts and forking tasks in ADA. Any help or suggestions would be
greatly appreciated. 

Matt
(mlow@galaxy.calpoly.edu)

Re: keyboard polling in ADA

[David Wheeler]

Matthew S Low (mlow@galaxy.csc.calpoly.edu) wrote:

: I'm sorry, in my last posting for keyboard polling in Ada I forgot to
: mention that I am attempting to do this using BSD UNIX. I was also asked
: whether I was trying to "do something" while the program looped waiting for
: a keystroke, and the answer is yes. I'm beginning to look into the areas of
: interrupts and forking tasks in ADA. Any help or suggestions would be
: greatly appreciated. 

There are at least 3 ways I can think of:

1. Use a pragma Convention(...) and call the operating system, presuming
   that the OS provides a way to poll the keyboard.
   This is usually easy.
2. Use Ada 95, which has a way to poll the keyboard in Text_IO.
3. Use Ada tasks to implement this.
   For an example, see the "PDI" example at:
        http://lglwww.epfl.ch/Ada/Examples/PDI/


This sort of stuff depends on the Ada implementation & OS interface.
   


--- David A. Wheeler
Net address: wheeler@ida.org

Re: keyboard polling in ADA

[Robert Dewar]

David Wheeler said

"1. Use a pragma Convention(...) and call the operating system, presuming
   that the OS provides a way to poll the keyboard.
   This is usually easy."

He meant pragma Import, pragma Convention won't get you very far in calling
an operating system service routine!

keyboard polling in ADA

[Matthew S Low]

Our software engineering class is attempting to write an ADA program that
requires keyboard polling. In other words, we want to enter a loop and
continue that loop until the user presses any key on the keyboard. This
sounds like a fairly easy process to implement, but a very difficult one to
find info on. Any info or hints on how to achieve keyboard polling using ADA
would be greatly appreciated.  Thanks.

Matt Low
(mlow@galaxy.calpoly.edu)

Re: keyboard polling in ADA

[David Arno]

In article <3jlo93$4pv@galaxy.csc.calpoly.edu>
           mlow@galaxy.csc.calpoly.edu "Matthew S Low" writes:

> Our software engineering class is attempting to write an ADA program that
> requires keyboard polling. In other words, we want to enter a loop and
> continue that loop until the user presses any key on the keyboard. This
> sounds like a fairly easy process to implement, but a very difficult one to
> find info on. Any info or hints on how to achieve keyboard polling using ADA
> would be greatly appreciated.  Thanks.
> 
> Matt Low
> (mlow@galaxy.calpoly.edu)
> 
> 
> 

Perhaps if you specified what computer you are attempting to do this on, you
might get some help from ppl.
-- 
David Arno