?
Solved

notify when "fn" key is pressed

Posted on 2000-05-04
5
Medium Priority
?
484 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 375 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

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Please read the paragraph below before following the instructions in the video — there are important caveats in the paragraph that I did not mention in the video. If your PaperPort 12 or PaperPort 14 is failing to start, or crashing, or hanging, …
Screencast - Getting to Know the Pipeline
Suggested Courses

830 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