how to read file's content using elisp?

how to read file's content using elisp?

[Rokia]

I want get a file's content.  I didn't find the right function.

I has RTFM.  there is only a function which can read file's content to
the buffer's position.

thanks for your help.

Re: how to read file's content using elisp?

[Barry Margolin]

In article <uacvrix5e.fsf@yahoo.com.cn.discuss>,
 Rokia <Rokiadd@yahoo.com.cn.discuss> wrote:

> I want get a file's content.  I didn't find the right function.
> 
> I has RTFM.  there is only a function which can read file's content to
> the buffer's position.

What you generally do is load the file into a buffer and process it 
there.

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***

Re: how to read file's content using elisp?

[Rokia]

what I want to do is reading a file's content into a string
variable. like this.

(setq dddstring (foo-read-file "dd.txt"))
(prin1 dddstring)

Re: how to read file's content using elisp?

[Henrik Enberg]

Rokia <Rokiadd@yahoo.com.cn.discuss> writes:

> what I want to do is reading a file's content into a string
> variable. like this.
>
> (setq dddstring (foo-read-file "dd.txt"))
> (prin1 dddstring)

(setq dddstring (with-temp-buffer
		  (insert-file-contents "dd.txt")
		  (buffer-string)))

Re: how to read file's content using elisp?

[John Sullivan]

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Rokia <Rokiadd@yahoo.com.cn.discuss> writes:

> what I want to do is reading a file's content into a string
> variable. like this.
>
> (setq dddstring (foo-read-file "dd.txt"))
> (prin1 dddstring)

I'm not trustworthy on these matters, but here's a once-tested
quickie:

(defun foo-read-file (full-filename)
  "Read a file and return foo-file as a string."
  (with-temp-buffer
    (insert-file-contents full-filename)
    (buffer-string)))

This should work with the syntax you used.

-John


       

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Re: how to read file's content using elisp?

[Rokia]

thank you very much. 

this is exactly what I want. :)

Re: how to read file's content using elisp?

[Rokia]

???
why was my name changed??

Re: how to read file's content using elisp?

[Barry Margolin]

In article <uhdpzc8dm.fsf@yahoo.com.cn.discuss>,
 Rokia <Rokiadd@yahoo.com.cn.discuss> wrote:

> ???
> why was my name changed??

>From what to what?

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***

Re: how to read file's content using elisp?

[Eli Zaretskii]

> From: Rokia <Rokiadd@yahoo.com.cn.discuss>
> Date: Thu, 16 Sep 2004 00:03:09 +0800
> 
> 
> what I want to do is reading a file's content into a string
> variable.

That is actually not a very good idea in Emacs Lisp.  In Emacs Lisp,
it is much easier to manipulate text in a buffer than to manipulate
text in a string.  For starters, buffers are managed memory-wise much
more efficiently (so the code that uses a buffer is generally faster),
and there are many functions that only work on buffers.

So I suggest to redesign the solution to whatever problem you are
trying to deal with, such that you use a buffer (perhaps a temporary
one) instead of a string.

What problem was that, anyway?

Re: how to read file's content using elisp?

[Eli Zaretskii]

> From: Rokia <Rokiadd@yahoo.com.cn.discuss>
> Date: Wed, 15 Sep 2004 19:34:05 +0800
> 
> 
> I want get a file's content.  I didn't find the right function.
> 
> I has RTFM.  there is only a function which can read file's content to
> the buffer's position.

If you mean insert-file-contents, then that's how you read a file into
Emacs.  Please explain why this is not good for you, and someone will
show you how to overcome the difficulties.

Re: how to read file's content using elisp?

[Miguel Frasson]

Rokia <Rokiadd@yahoo.com.cn.discuss> writes:

> I want get a file's content.  I didn't find the right function.
> 
> I has RTFM.  there is only a function which can read file's content to
> the buffer's position.
> 
> thanks for your help.

find-file (C-x C-f) is the more common way to read the file's content
(into a NEW buffer). Try to see the `File' menu.

-- 
Miguel Vinicius Santini Frasson
http://www.math.leidenuniv.nl/~frasson