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POParsing Twitter feeds in C
 

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  1. POParsing Twitter feeds in C
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    <p>I'm trying to figure out how to get the most recent latitude and longitude of a Twitter user (from the new Geo API data, ie the <code>&lt;geo:point&gt;</code> tag, you can see how they look like on <a href="http://twitter.com/statuses/user_timeline.xml?screen_name=jphastings" rel="nofollow noreferrer">my twitter user timeline xml feed</a>). I also need to retrieve how old that data is (in seconds) from the <code>&lt;created_at&gt;</code> tag.</p> <p>I'm trying to write this in C to use with an <a href="http://mbed.org" rel="nofollow noreferrer">mbed microcontroller</a> so I can't use any big libraries (ideally I wouldn't use any libraries, but that might be a bad idea). The mbed site suggests <a href="http://mbed.org/users/rolf/notebook/random-libraries/" rel="nofollow noreferrer">a few light libraries</a> - <a href="http://lloyd.github.com/yajl/" rel="nofollow noreferrer">YAJL</a> and FastXML seem useful - but my C knowledge is very basic and I'm unsure as to how to proceed.</p> <p>Assuming I have the code for retrieving a twitter user timeline into memory as a string and/or to disk (as either JSON or XML) how should I proceed?</p> <p>At the moment I'm doing this scraping on my webserver via PHP, but I'd rather have it done in C as I hope to release the code when I'm done (and I don't want my poor server being rammed!) The PHP looks like this:</p> <pre><code>&lt;?php date_default_timezone_set('UTC'); try { $tweets = json_decode(file_get_contents("http://twitter.com/statuses/user_timeline.json?screen_name=".urlencode($_GET['screenname']))); foreach($tweets as $tweet) { if (is_array($tweet-&gt;geo-&gt;coordinates)) { echo date("U") - strtotime($tweet-&gt;created_at); echo ",{$tweet-&gt;geo-&gt;coordinates[0]},{$tweet-&gt;geo-&gt;coordinates[1]}"; break; } } } catch (Exception $e) { exit(); } </code></pre> <p>This works fairly well, but I have no idea how to turn this into C! Any ideas?</p> <p>Here's a snippet of the XML I'm expecting to deal with:</p> <pre><code>&lt;statuses type="array"&gt; &lt;status&gt; &lt;created_at&gt;Sat Dec 12 22:25:17 +0000 2009&lt;/created_at&gt; &lt;id&gt;6611101548&lt;/id&gt; &lt;text&gt;Hello stackoverflow! This tweet is geotagged.&lt;/text&gt; &lt;other tags/&gt; &lt;geo&gt; &lt;georss:point&gt;52.946972 -1.182846&lt;/georss:point&gt; &lt;/geo&gt; &lt;/status&gt; &lt;status ...&gt; &lt;/statuses&gt; </code></pre> <p>(btw, the mbed is awesome, I'm having an amazing time with it despite my lack of advanced knowledge in C or electronics, they're <a href="http://uk.farnell.com/nxp/om11043/kit-mbed-prototyping-board-lpc1768/dp/1761179" rel="nofollow noreferrer">in stock at Farnell</a> for £32 and definitely worth the money!)</p>
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    1. COIf you post the format of some of the data structures, you'll get better answers.
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      1. USThomas Matthews
    2. COI guess I ought to put some up here rather than just pointint to the twitter XML feed - I'll add a snippet - thanks
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