On Oct 10, 2009, at 12:41 PM, jon wrote:
oh... that is good to know... hmm, well it looks like i need to go lower in the mechanism, stuff i don't know anything about, so i'll do research on the best way to get the info off the website at a lower level.
RSS or Atom feeds are often used for this purpose. Does the site have feeds that you can check to find when things change? If so, look at the PubSub framework in 10.5+ which will automatically subscribe to and track feeds for you. It tries hard to be as efficient about it as possible. (Disclaimer: I wrote part of that framework so I'm biased :)
If you can't use a feed, use NSURLRequest to fetch the page. If you leave the caching settings alone, it should be pretty good about being lazy: it will send a "conditional GET" that allows the server to respond with a "nothing's changed" response (just a couple of bytes) if the page hasn't changed. You can check the "Last-Modified" and "ETag" headers in the NSHTTPURLResponse object and compare them to what you got last time; if they're the same, there's no need to parse the page.
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