On Jan 10, 2008 8:51 PM, Peter Dyballa < Peter_Dyballa@web.de> wrote:
>
> Am 09.01.2008 um 10:48 schrieb Forrest:
>
>
> > i tried to figure out why, then i googled much but got little
> > helpful, it
> > seems that `terminfo' is the point but i cannot understand what it
> > is, the
> > output of 'infocmp' is a mess for me :(
>
> It's not that. It's ASCII:
>
> C-@ -> \000 or NUL
> C-a -> \001
> C-b -> \002
> ...
> C-z -> \032
> C-[ -> \033
> C-\ -> \034
> C-] -> \035
> C-^ -> \036
> C-_ -> \037
> SPC -> \040
>
> This has nothing to do with terminfo. The latter is for drawing and
> moving the cursor on an alpha-numeric text screen.
>
> --
> Greetings
>
> Pete
>
> It isn't pollution that's harming the environment. It's the
> impurities in our air and water that are doing it.
>
>
>
>


Thank you very much Pete! I think I've got it.

1. It's the keyboard driver that ignores key-combinations like `C-,'
(mentioned by Andreas). When I press `C-,', the keyboard driver received it
and does nothing, so the terminal doesn't even know I've press keys. That's
why emacs cannot accept `C-,' ---- emacs doesn't even know the key-press
action!
2. The keyboard driver gives an ASCII code to any `Ctrl-' thing it thinks
reasonable. The code is actually "stolen" from the ASCII table. Because the
Char 0~32 will never be generated by a keyboard, they can be used for any
purpose the driver wants. That's why Pete and Nick asked me to see `man
ascii'.
3. When a key like F1~F12 or HOME, END are pressed, a key sequence begins
with a ESC(27) will be passed to the terminal, and probably be passed on to
emacs.
4. I guess that the keyboard driver used in an X is different with that used
in a console. The former passed each key-press to a program, but not ignore
combinations like `C-,'. Thus emacs in an X can receive every press of mine.

Again, a lot of thanks to Pete, and Nick, and Andreas, and everyone who
helped me in this question. I just reviewed all the messages I received. I
didn't understand what I've read because I took it for granted that the
keyboard driver will pass everything to the terminal.

Best Regards,
Forrest Y. Yu


-- 
Stupid is as stupid does.