How to get image data from a WebView into an NSData object? [closed]

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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. "http://www.domain.com/path/image.jpg"), 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?

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Try this:

1. Get the web view's main frame.
2. Get the frame's data source.
3. Ask the data source for the downloaded resource for the image URL.
4. Get the resource's data.