From: Ryan Leavengood <mrcode@...>
Date: 2005-04-21T05:12:54+09:00
Subject: Re: Newb CGI Question

> So I thought I had CGI in Ruby figured out, but I'm stumped on the
> following:
>
> I want use Ruby to dynamically serve an image. The image tag would
> look like <img src="file.rb?id=200">, where 200 is the id for an
> image.
>
> So here's what I have (I'm trading embarrassment for guidance):
>
> require "cgi"
> cgi = CGI.new("html4")
> cgi.out('image/png')
> File.read('200.png')
>
> Now, I'm pretty sure I'm not reading the file right, but what I seem
> to be stuck on first is getting my MIME type right. When hitting the
> CGI, I can't get Content-Type to come back as 'image/png'. It's always
> 'text/html'.
>
> Any tips?

Try the following:

require "cgi"
cgi = CGI.new("html4")
cgi.out('image/png') do
   File.read("#{cgi['id']}.png")
end

You have to supply the content in a block passed to out. I also added the
necessary code to read the id and open that file.

Ryan Leavengood