Re: [Jscheme-user] capture command output in string?

[Timothy J. H. <ti...@cs...>]

On Apr 22, 2006, at 7:44 PM, Geoffrey Knauth wrote:

> I'm running a command and I'd like to capture the output in a string.   
> For example:
>
> 	(out (run (cmd (wc -l ,filename))))
>
> I tried wrapping a ByteArrayOutputStream in a PrintStream, but that  
> didn't seem to do anything.

You need to create a StringWriter object w,
wrap it in a PrinterWriter object p, and pass that object as the second  
parameter to the "out" method.
Invoking .toString on the w object will give you your string....

Here's an example...

 > (define w (java.io.StringWriter.))

 > (out (run (cmd (ls -l "."))) (java.io.PrintWriter. w))
0
 > (display (.toString w))
total 155416
drwx------  45 tim  tim      1530 22 Apr 09:56 Desktop
drwx------  67 tim  tim      2278 18 Apr 07:58 Documents
drwx------  44 tim  tim      1496 10 Apr 17:47 Library
drwx------   6 tim  tim       204  1 Apr 19:49 Movies
drwx------   5 tim  tim       170 30 Jan  2005 Music
drwx------   4 tim  tim       136  7 Jan 20:08 Pictures
---snip---


Best,
---Tim---


>
> Geoffrey
> --
> Geoffrey S. Knauth | http://knauth.org/gsk
>
>
>
>
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