From: Mark Volkmann <r.mark.volkmann@...>
Date: 2006-05-17T21:26:09+09:00
Subject: Re: Capturing stdout

Here's another alternative.

  # Create a string object to receive the output.
  dest = ''

  # Add a write method to this string object.
  def dest.write(data); self << data; end

  old_stdout, $stdout = $stdout, dest

  # Invoke code that uses puts.

  # Restore stdout.
  $stdout = old_stdout

On 5/17/06, Daniel Harple <dharple@generalconsumption.org> wrote:
> 2006/5/17, Damphyr <damphyr@freemail.gr>:
> > I have code that prints to stdout (using puts and/or print).
> > I'm loading the code from a file (pretty much the way rake handles
> > rakefiles) and would like to capture the output from the loaded code.
> > I don't want to redirect stdout into a file or anywhere else, I
> > need the
> > output in a string.
> >
> > ---file1.rb
> > puts "Output of meaningful code omitted"
> > ---loader.rb
> >
> > begin
> > ###do some magic to get the stdout from this point on into a string
> > load file1.rb
> > ###do some more magic to put stdout back where it was.
> > end
> >
> > Has anyone a solution for this?
>
> require 'stringio'
> stdout = StringIO.new
> $stdout = stdout
> load "file1.rb"
> $stdout = STDOUT
> stdout.rewind
> puts "got: #{stdout.read}" # => got: Output of meaningful code omitted
>
> -- Daniel
>
>
>
>


-- 
R. Mark Volkmann
Object Computing, Inc.