emacs -- keybind questions

I have successfully used Ctrl+Shift+Up ' Ctrl+Shift+down '

Ctrl+Shift+left' Ctrl+Shift+Right to different commands. But when I

tried to use Ctrl+s to the command save-buffer and Ctrl+Shift+s, which

is equivalent to Ctrl+S, to another command, it has some problem.

save-buffer works fine, but when I type Ctrl+Shift+s, it excute

the command save-buffer. I used Ctrl+q to find the control sequences of

Ctrl+s and Ctrl+Shift+S, I get the same result, which is ^S.

I expect that I will get ^s for Ctrl+s, but it doesn't.

Anyone knows the reason?

Another queston is: I use Ctrl+c for the command killing-ring-save. In this

case, all commands (which are of large number) begin with Ctrl+c don't work now.

Is there a way to replace the prefix Ctrl+c by another customized prefix?

I may pose my question in the wrong direction. I use ctrl+c as

killing-ring-save. It works fine in emacs (no mode). But if I open a .c file (C-mode), then

when I type Ctrl+c, it waits me to type another key. I think in this case,

ctrl+c is regarded as a prefix. In this case, I need the following modifications:

Using a custom defined prefix, say Ctrl+a, as Ctrl+c ; Remove the

prefix Ctrl+c ; Using Ctrl+c as killing-ring-save.

I add the following to my ~/.emacs :

(global-set-key (kbd "C-a") mode-specific-map)

(global-set-key (kbd "C-c") 'kill-ring-save)

(global-set-key (kbd "C-f") 'isearch-forward)

(global-set-key (kbd "C-v") 'yank)

(global-set-key (kbd "C-s") 'save-buffer)

(defun my-c-initialization-hook ()

(define-key c-mode-base-map (kbd "C-a") mode-specific-map)

(define-key c-mode-base-map (kbd "C-c") 'kill-ring-save))

(add-hook 'c-initialization-hook 'my-c-initialization-hook)

But this开发者_如何学Python doesn't work. Ctrl+c is still regarded as a prefix, so I can't use it

as kill-ring-save. Furthermore, if I type Ctrl+a Ctrl+c, it said it's not

defined. (I thought it will have the same result as I type Ctrl+c Ctrl+c)

The C-c binding is tricky, CUA mode solves it well, by only making it do kill-ring-save when you have a region marked.

First, Control-S is an ASCII control character -- ^s and ^S are the same character.

Keys are something different from characters, however, and if you are using Emacs with a window manager then you can distinguish the keys C-s and C-S-s. The latter is Control-Shift-s.

The problem you are hitting is that if you do not explicitly bind the shifted version of a letter key, then the shifted letter key uses the binding of the unshifted key. This is a "feature".

So you need to bind both C-s and C-S-s.

(global-set-key (kbd "C-s") 'save-buffer)
(global-set-key (kbd "C-S-s") 'another-command)

If you're running emacs in a terminal, then the reason for the shift-ctl-c issue could be the terminal driver. In that case, give the command stty stop undef, then run emacs again, and see if it affects the problem. Also, see if you get same problem with shift-ctl-other letters