From: Joel VanderWerf <vjoel@...>
Date: 2006-11-17T07:09:37+09:00
Subject: Re: Another IO.popen question ...

Adam Groves wrote:
> Hi,
> 
> I'm wanting to create thumbnails of pdfs in png format and send them off 
> to be saved. I've come up with this so far:
> 
>     IO.popen("curl #{some_uri} | convert -resize 700x700 pdf:-[0] 
> png:-") {|f| do_something_with_this_file}
> 
> Which works a treat. (In case you didn't know, convert is a command line 
> tool for ImageMagick).
> 
> What I'd really like to do though is pass on a File object to convert:
> 
> file = File.open("mypdf.pdf")
> 
>     IO.popen("#{file} | convert -resize 700x700 pdf:-[0] png:-") {|f| 
> do_something_with_this_file}

would this work?

file = "mypdf.pdf"
IO.popen("cat #{file} | ...")

or simply

IO.popen("convert -resize 700x700 #{file} png:-")

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