From: Daniel Berger <djberg96@...>
Date: 2008-05-21T02:34:08+09:00
Subject: Re: Arbitrary IO object



On May 20, 11:25 am, Robert Klemme <shortcut...@googlemail.com> wrote:
> On 20.05.2008 18:40, Daniel Berger wrote:
>
> > How would I go about using IO.new such that it would automatically
> > grab the next available file descriptor?
>
> Not sure what you mean: File.open uses a new file descriptor.  Why would
> you care about the file descriptor numbering?
>
> > I don't know the fileno in
> > advance and I can't use StringIO.
>
> Why would you want to use StringIO to read from files?
>
> > What are my options?
>
> What are you trying to achieve?

I'm tinkering with possibly reimplementing win32-open3 using the win32-
process library. You can redirect stdin, stdout and stderr like so:

info = Process.create(
   input  = IO.new(x, 'w+')  # Want next available fd
   output = IO.new(y, 'w+') # Want next available fd
   error  = IO.new(z, 'w+')  # Want next available fd

   :app_name       => command,
   :creation_flags => Process::DETACHED_PROCESS,
   :startup_info   => {
      :stdin  => input,
      :stdout => output,
      :stderr => error
   }
)

pid = info.process_id

return [input, output, error, pid]

That's the general idea, anyway.

Regards,

Dan