From: Eric Mahurin <eric_mahurin@...>
Date: 2005-09-15T03:55:21+09:00
Subject: Re: IO like object

--- Logan Capaldo <logancapaldo@gmail.com> wrote:

> On Sep 11, 2005, at 6:46 PM, Alex Fenton wrote:
> 
> > Hi Simon
> >
> > Nice job on finding a solution to unwanted command prompts
> with  
> > popen()
> > and backticks on win32.
> >
> > Guessing this is on the same track, perhaps the standard
> 'stringio'  
> > library
> > could be used to supply IO-esque methods to string input
> and output  
> > from
> > Win32API calls?
> >
> > alex
> >
> > Simon Kr�ger wrote:
> >
> >> Hi List,
> >> i have an IO like object (in this case win32 pipes,
> connected to a  
> >> child process). If i can provide a read and write method
> is there  
> >> a way to get all the other IO methods for free? (like
> getc, each,  
> >> each_byte, print, printf....)
> >> cheers
> >> Simon
> >>
> >
> >
> 
> Have you considered creating a subclass from IO and defining
> the  
> necessary methods?


A module defining all other methods based on just would also
work.  Then just include it.

I used both approaches for my Cursor classes (superset of IO
functionality but a different API).  You would include one
module if your class defined just insert/delete (either
direction), another if it defined those plus read/write an
element (either direction), and another if you defined only
forward operations plus a skip back one element.  The project
is here:

http://rubyforge.org/projects/cursor/

I guess I could add another module to include if you want to
make a cursor look like an IO.  I didn't want that to be the
default because putting all this in Cursor would add a lot of
clutter as it already emulates much of the Array/String API. 
Also the method naming in IO didn't seem appropriate for Cursor
which can handle more than just strings/characters and
symmetrically goes in both directions.



		
__________________________________ 
Yahoo! Mail - PC Magazine Editors' Choice 2005 
http://mail.yahoo.com