Hi,
I have just started to learn the lisp language. Is there any common
function for "creation file"?
Thank you for your attention.
kind regards/chenyu
On 2003-11-21 07:37:22, chenyu wrote:
> I have just started to learn the lisp language. Is there any common
> function for "creation file"?
Should be mentioned in every book. Or in the Hyperspec:
http://www.lispworks.com/reference/HyperSpec/Body/20_.htm
Stefan Scholl <······@no-spoon.de> writes:
> On 2003-11-21 07:37:22, chenyu wrote:
> > I have just started to learn the lisp language. Is there any common
> > function for "creation file"?
>
> Should be mentioned in every book. Or in the Hyperspec:
> http://www.lispworks.com/reference/HyperSpec/Body/20_.htm
No. This is the chapter about Files. The file create is done in the
chapter about Streams. Ain't it logical?
--
__Pascal_Bourguignon__
http://www.informatimago.com/
·········@hotmail.com (chenyu) writes:
> Hi,
> I have just started to learn the lisp language. Is there any common
> function for "creation file"?
It's not often useful to merely create a file.
(But sometimes it is, witness the touch command in unix).
So, assuming that you don't want to only create the file but also fill
it, that's done opening a stream. You may use the OPEN function, or,
since there will be a time when you'll be done filling the file and
you'll be wanting to CLOSE it, you may as well use WITH-OPEN-FILE that
will do everything for you (but the filling):
(WITH-OPEN-FILE (FILE PATH
:DIRECTION :OUTPUT
:IF-DOES-NOT-EXIST :CREATE
:IF-EXISTS :ERROR)
(FORMAT FILE "DATA DATA DATA~%"))
But if you just want the functionality of touch(1), you may do it with:
(DEFUN TOUCH (PATH)
(WITH-OPEN-FILE (FILE PATH
:DIRECTION :OUTPUT
:IF-DOES-NOT-EXIST :CREATE
:IF-EXISTS NIL)))
http://www.lisp.org/HyperSpec/Body/sec_the_streams_dictionary.html
--
__Pascal_Bourguignon__
http://www.informatimago.com/
From: Roman Belenov
Subject: Re: new question, create file in lisp
Date:
Message-ID: <u1xs2nlnn.fsf@intel.com>
·········@hotmail.com (chenyu) writes:
> I have just started to learn the lisp language. Is there any common
> function for "creation file"?
Yes, open function can do it. Read also about with-open-file macro -
it makes file handling safer and easier and is sufficient in many
cases.
--
With regards, Roman.
Standard disclaimer: I work for them, but I don't speak for them.
Thank you for everyone's reply.
kind regards/chenyu
Roman Belenov <·············@intel.com> wrote in message news:<·············@intel.com>...
> ·········@hotmail.com (chenyu) writes:
>
> > I have just started to learn the lisp language. Is there any common
> > function for "creation file"?
>
> Yes, open function can do it. Read also about with-open-file macro -
> it makes file handling safer and easier and is sufficient in many
> cases.