From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-10-07T00:21:43+09:00
Subject: Re: popen in non-blocking mode


On Oct 6, 2007, at 5:17 AM, Urizev wrote:

> I want to execute a program which prompts for commads from standard
> input and returns responses to standard output, this process repeats
> several times. I want to execute it from a ruby application. I tried
> to use a popen call to do it, but it do not flush the output until
> input channel is closed. I need to know what the process request
> before sending a response.

the general concepts are:


IO.popen cmd, 'r+' do |pipe|

   pipe.sync = true ### you can do this once

   loop do
     buf = pipe.gets

     case buf
       when /A/
         pipe.puts 'response_A'
       when /B/
         pipe.puts 'response_B'
     end

     pipe.flush ### or this after each write
   end

end


kind regards.

a @ http://codeforpeople.com/
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