Solved

notify when "fn" key is pressed

Posted on 2000-05-04
5
477 Views
Last Modified: 2010-08-05
On my laptop computer I have a key named "Fn" (the function key) and I want to make a function that can override the key when it is pressed. How do I do that?
0
Comment
Question by:hypereng
5 Comments
 
LVL 2

Expert Comment

by:mullet_attack
ID: 2777210
I would guess that you can't. A standard keyboard does not have this key, therefore there is not a key scan code for it. In the PC keyboard(original) a Micro converts the x-y key matrix into these scan codes, and sends them to another micro on the motherboard (keyboard controller). All PC hardware does it like this, althought these days using different chipsets. In your laptop, the micro that does the keyboard stuff sends different keycodes depending on the state of the Fn Key, therefore it doesn't exist as a key in it's own right, it only modifies other keys codes. Sorry 'bout this, but my opinion is that this can't be done (perhaps the manufacturer can, but they know stuff we dont).
0
 
LVL 2

Expert Comment

by:craig_capel
ID: 2777636
hyp, out of intrest what does this do to the function keys?...

asm
  in al,21h
  or al,2;
  out 21h,al;
end;
 

Goes in one button then this in the second...



                    asm
                        in al,21h
                        and al,253;
                       out 21h,al;
                    end;  

When u press them, does the FN key still work?...
0
 

Author Comment

by:hypereng
ID: 2778369
It seems to be very difficult (maybe impossible) disabling the function key while the assembly stuff doesn't dissable the function key, even though it dissables all the other keys on the keyboard.
0
 
LVL 2

Expert Comment

by:craig_capel
ID: 2778435
so i take it you tried that, and it failed.... I think your right, its impossible :) unless you get code from the people who made the laptop....
0
 
LVL 1

Accepted Solution

by:
saulite earned 125 total points
ID: 2787846
You can't handle that key. This key is handled by keyboard itself. For example, if you press [Fn]+[Setup], keyboard sends [Setup] keycode only. Of course you can handle the [Setup] ceycode. This key is made only to decrease the size of keyboard.
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Sending Gmail through Delphi 3 110
Send message from delphi to whatsapp, is it possible? 3 1,464
Adoquery sql  left join does not work 25 91
MS Access from Delphi 31 33
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

832 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question