From: Joel VanderWerf <vjoel@...>
Date: 2006-11-17T08:03:04+09:00
Subject: Re: Another IO.popen question ...

Adam Groves wrote:
> Hi Joel,
> 
> thanks for the speedy reply! The problem is, I need to pass on a file 
> object (which has been uploaded from a web page form) to 'convert' and 
> not just a path. I should have made this clearer in my original post.
> 
> Any ideas?
> 

Untested, but maybe something like this?

file = File.open("mypdf.pdf")
IO.popen("convert -resize 700x700 pdf:-[0] png:-") do |f|
   while (data=file.read(N))
     f.write data
   end
end

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407