output S.O.S.
Scott Green
If anyone can help me with this, it'd be goddam excellent.
All I want to do (I'm sure it's v. simple, really) is get
Lisp to send its output to a file instead of (or as well as)
the screen. The literature states that all you need to do is
put (format t "my output text"), replacing t with the desired
destination. But it ain't workin'. It just doesn't want to know.
Can someone PLEASE help me? Thanking U in advance.
David J Cooper Jr
Scott Green wrote:
> All I want to do (I'm sure it's v. simple, really) is get
> Lisp to send its output to a file instead of (or as well as)
> the screen. The literature states that all you need to do is
> put (format t "my output text"), replacing t with the desired
> destination. But it ain't workin'. It just doesn't want to know.
>
> Can someone PLEASE help me? Thanking U in advance.
You need some decent literature such as Graham's ANSI Common Lisp.
(with-open-file (outstream "/tmp/spew.txt"
:direction :output
:if-exists :supersede
:if-does-not-exist :create)
(format outstream "my output text"))
--
David J Cooper Jr Genworks International
dcoo...@genworks.com http://www.genworks.com
...Embracing an Open Systems Approach to Knowledge-based Engineering...
P. Srinivas
Scott Green (scott....@virgin.net) wrote:
: If anyone can help me with this, it'd be goddam excellent.
: All I want to do (I'm sure it's v. simple, really) is get
: Lisp to send its output to a file instead of (or as well as)
: the screen. The literature states that all you need to do is
: put (format t "my output text"), replacing t with the desired
: destination. But it ain't workin'. It just doesn't want to know.
You need to create a STREAM for the file and pass it to
FORMAT for output. Here is a simple example:
(with-open-file (str "myfile.lisp" :direction :output :if-exists :overwrite)
;; now the varibale STR is bound to a OUTPUT STREAM which
;; is obtained by opeing a connection to the file "myfile.lisp"
(format str "Hello world!~%") ; output goes to the file
(format str "Whatever you want~%") ; output goes to the file
)
WITH-OPEN-FILE automatically closes the stream after its body is processed.
Alternatively, you can do the opening and closing yourself.
> (setq *myfile-stream* (open "myfile.lisp" :direction :output ))
#<output stream ...>
> (format *myfile-stream* "Hello World!~%")
Hello World
> (close *myfile-stream*)
#< closed strem ... >
hope this helps.
Srini
Steve Gonedes
Scott Green wrote:
>
> If anyone can help me with this, it'd be goddam excellent.
>
> All I want to do (I'm sure it's v. simple, really) is get
> Lisp to send its output to a file instead of (or as well as)
> the screen. The literature states that all you need to do is
> put (format t "my output text"), replacing t with the desired
> destination. But it ain't workin'. It just doesn't want to know.
>
You can make a broadcast stream that does I/O to more than one stream at
a time.
(with-open-file (out "output.txt" :direction :output)
(let ((outstream (make-broadcast-stream out *standard-output*)))
(format outstream "~2&Hello!")))
I don't know if a broadcast-stream would work with *terminal-io*, it
probably would; but I have no way of testing that right now.
Kevin Goodier
Scott Green (scott....@virgin.net) says...
> If anyone can help me with this, it'd be goddam excellent.
>
> All I want to do (I'm sure it's v. simple, really) is get
> Lisp to send its output to a file instead of (or as well as)
> the screen. The literature states that all you need to do is
> put (format t "my output text"), replacing t with the desired
> destination. But it ain't workin'. It just doesn't want to know.
>
> Can someone PLEASE help me? Thanking U in advance.
In addition to what everyone has said about the FORMAT command, you may
also want to look at DRIBBLE. Where they got the name baffles me, but
us it like:
(dribble "output.txt")
And EVERYTHING that would normally be written to the screen will be
written to the file name you specify. It's just like a terminal
capture.. To turn it off, just do
(dribble)
------------->
Kevin Goodier
bk...@cec.wustl.edu
http://students.cec.wustl.edu/~bkg2/
Erik Naggum
* Scott Green
| All I want to do (I'm sure it's v. simple, really) is get Lisp to send
| its output to a file instead of (or as well as) the screen. The
| literature states that all you need to do is put (format t "my output
| text"), replacing t with the desired destination. But it ain't workin'.
| It just doesn't want to know.
in addition to the many excellent answers, also note that you can set or
bind *STANDARD-OUTPUT* to some other stream object and still use T in
FORMAT to write to it. don't know if this is what you really want.
#:Erik
--
God grant me serenity to accept the code I cannot change,
courage to change the code I can, and wisdom to know the difference.