From: Adam Groves <adam.groves@...>
Date: 2006-11-17T07:03:38+09:00
Subject: Another IO.popen question ...

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}

This obviously doesn't work but I hope illustrates what I'm wanting to 
acheive - namely to pass 'file' to convert it to a png which is read 
back into ruby and uploaded to my file repository on S3.

By the way, this IS for a rails application, but it seems basically like 
a pure ruby question to me.


Regards

Adam

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