comp.lang.ruby

Edwin Eedwin

9/29/2006 9:50:00 PM

unknown wrote:
> I'm pretty new to Ruby and Rails. I am writing a Rails application
> that is meant to be run on a local machine. It allows the user to
> select a bunch of image (jpg, gif, etc) files from anywhere on their
> file system and add them to an album.
>
> The prototype of the is app is going to leave the images where they are
> on the disk (and not persist them anywhere else). I want to write a
> controller that can take an image name and location on disk as a
> parameter and then serve the file to the user via the WEBrick server so
> that the image appears properly in the browser.
>
> Is there any sample code anywhere for opening a binary file and serving
> it as jpg (or whatever) to the user?
>
> Regards

I am an experienced programmer but new to Ruby (and Rails), and I had a
similar need to create a Ruby program that would merely serve a jpeg
image. The resulting program is trivial, probably so trivial that I
couldn't find it on the web. The information is in the documentation,
but you really have to connect the dots, not simple for someone new to a
domain. After an embarrassing amount of effort, I came up with the
following program:

#!/usr/bin/env ruby
require 'cgi'

f = File.new("served_image.jaypeg", "r")

cgi = CGI.new

cgi.out( "type" => "image/jpeg",
"expires" => Time.now + 3600 ) { f.read }

(The "expires" item is a purely gratuitious addition.)

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