title: How to get image data from a WebView into an NSData object?
body: <p>I have a Cocoa app that embeds a WebView. The WebView loads html elements including images. I have the textual links for the images (e.g. "<a href="http://www.domain.com/path/image.jpg" rel="nofollow noreferrer">http://www.domain.com/path/image.jpg</a>"), but what I want is the image data itself so I can put it in an NSData object and ship it off to Growl. The WebView must have this data since it has downloaded and rendered the image. How can I get at it?</p>