From: Kristof Bastiaensen <kristof@...>
Date: 2004-04-28T07:29:03+09:00
Subject: Re: popen issues

On Wed, 28 Apr 2004 06:06:30 +0900, Hal Fulton wrote:

> Here's something I've never figured out.
> 
> Suppose I want real two-way communication with a process via popen.
> This seems doable.
> 
> But apparently the read hangs until I do a close_write; and if I
> do that, I can't write again. A flush doesn't work.
> 

Hi,

I don't know how to do it in pure Ruby, but if you are 
using a GUI (Gtk) it is fairly easy.

pipe = IO.popen("prog", "w+")
Gtk::input_add(pipe.to_i, Gdk::INPUT_READ) {
  str = pipe.gets
  puts "got " + str }

This will work only from the event-dispatch routine inside
Gtk.main().

Kristof