What is the value of ^@ as character in elisp

What is the value of ^@ as character in elisp

[Slavomir Kaslev]

Hello,

I am new to emacs lisp and I am writing several functions to make
emacs communicate with Autodesk Maya.

I can't figure a way to get the value of ^@ as character in elisp. For
the moment I just copied the character in my .el source:

(defcustom etom-prompt-regexp "^^@$"
  "Regexp which matches the Maya's prompt."
  :type 'regexp
  :group 'etom)

where ^@ is the character, not the string "^@".

You can check the source code at http://www.emacswiki.org/cgi-bin/wiki/etom.el

Can anyone help me?

Thank you in advance.

Re: What is the value of ^@ as character in elisp

[Peter Dyballa]

Am 03.07.2007 um 10:08 schrieb Slavomir Kaslev:

> I can't figure a way to get the value of ^@ as character in elisp.

It's ASCII NUL. You can enter it via: C-q 0 0 RET.

--
Greetings

   Pete

Never be led astray onto the path of virtue

Re: What is the value of ^@ as character in elisp

[Slavomir Kaslev]

On Jul 3, 1:06 pm, Peter Dyballa <Peter_Dyba...@Web.DE> wrote:
> Am 03.07.2007 um 10:08 schrieb Slavomir Kaslev:
>
> > I can't figure a way to get the value of ^@ as character in elisp.
>
> It's ASCII NUL. You can enter it via: C-q 0 0 RET.
>
> --
> Greetings
>
>    Pete
>
> Never be led astray onto the path of virtue

Thank you Pete.

I should have just used string-to-char, which returns 0 on this
string.

Cheers

Re: What is the value of ^@ as character in elisp

[Johan Bockgård]

Slavomir Kaslev <slavomir.kaslev@gmail.com> writes:

> a way to get the value of ^@ as character in elisp.

You can use the ?\^@ syntax.

-- 
Johan Bockgård

Re: What is the value of ^@ as character in elisp

[Pascal Bourguignon]

Slavomir Kaslev <slavomir.kaslev@gmail.com> writes:

> Hello,
>
> I am new to emacs lisp and I am writing several functions to make
> emacs communicate with Autodesk Maya.
>
> I can't figure a way to get the value of ^@ as character in elisp. For
> the moment I just copied the character in my .el source:

In emacs lisp, characters are integers, like in C.

^@ is 0.

So to get the value of ^@, you can just write 0. For example:

(insert "Hello>" 0 "<world!")
; inserts:
Hello>\0<world!

(string 0) --> "\0"


> (defcustom etom-prompt-regexp "^^@$"
>   "Regexp which matches the Maya's prompt."
>   :type 'regexp
>   :group 'etom)

The Maya prompt is a null character???


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

NOTE: The most fundamental particles in this product are held
together by a "gluing" force about which little is currently known
and whose adhesive power can therefore not be permanently
guaranteed.

Re: What is the value of ^@ as character in elisp

[Kevin Rodgers]

Slavomir Kaslev wrote:
> I am new to emacs lisp and I am writing several functions to make
> emacs communicate with Autodesk Maya.
> 
> I can't figure a way to get the value of ^@ as character in elisp. For
> the moment I just copied the character in my .el source:
> 
> (defcustom etom-prompt-regexp "^^@$"
>   "Regexp which matches the Maya's prompt."
>   :type 'regexp
>   :group 'etom)
> 
> where ^@ is the character, not the string "^@".

[gnu.emacs.sources is for posting code; questions such as this should be
sent to gnu.emacs.help, which is where I'm cross-posting and directing
follow-ups.]

"^\000"

See the Nonprinting Characters node of the Emacs Lisp manual, follow the
link to the Character Type node, then its General Escape Syntax subnode.

-- 
Kevin Rodgers
Denver, Colorado, USA