From: Robert Klemme <bob.news@...>
Date: 2003-05-07T16:34:22+09:00
Subject: Re: capture output

How about:

def capture
    raise unless block_given?
    a, b, c = $defout, $stderr, $stdout
    buf = StringIO.new(s = "", "w")

    begin
        $defout, $stderr, $stdout = buf
        yield
    ensure
        buf.close
        $defout, $stderr, $stdout = a, b, c
    end
    s.split(/\n/)
end

res = capture {
        puts "1"
        popen("ruby output.rb", "r") do |io|
          print( io.read )
        end
        puts "2"
}

Regards

    robert

"Simon Strandgaard" <0bz63fz3m1qt3001@sneakemail.com> schrieb im
Newsbeitrag news:pan.2003.05.06.22.54.18.656367@sneakemail.com...
> I have seen much talking about this topic, but no working code!
>
> I want to capture all output from [ruby, child_processes].
> How can I do this ?
>
>
> When I run my code I get this output..
> But this is not what I am expecting.
>
> > ruby main.rb
> stderr
> stdout
> defout
> OK 1
> OK 2
> >
>
> I want output like this.. what am I doing wrong ?
> OK 1
> OK stderr
> OK stdout
> OK defout
> OK 2
>
>
>
> > cat main.rb
> require 'stringio'
>
> def capture
>     raise unless block_given?
>     a, b, c = $defout, $stderr, $stdout
>     buf = StringIO.new(s = "", "w")
>     begin
>         $defout, $stderr, $stdout = buf
>         yield
>     ensure
>                 buf.close
>         $defout, $stderr, $stdout = a, b, c
>     end
>         s.split(/\n/)
> end
>
> res = capture {
>         puts "1"
>         system("ruby output.rb")  # BOOM - Output is not being captured?
>         puts "2"
> }
> puts res.collect{|s| "OK "+s }.join("\n")
> > cat output.rb
> $stderr.puts "stderr"
> $stdout.puts "stdout"
> $defout.puts "defout"
> >
>
>
> --
> Simon Strandgaard