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Index › Programming Questions & Help › Syntax Questions › Scraping a web page for data
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Scraping a web page for data (Read 517 times)
rolandblais
Scraping a web page for data
Feb 26th, 2009, 1:44am  
Hi.

I'm trying to do an extremely (or so I thought) simple thing -

I have a url that either returns a 0 or 1. I'm trying to get at that data by modifying the sketch in "Getting Started with Arduino" - example 6.1.

I get (more or less) how to use:

   URL url = new URL(feed);
   URLConnection conn = url.openConnection();
   conn.connect();
   //etc

but I don't know how to parse the data, so that I can simply display "Data = <someval>." Can anyone point me in the right direction?

Eventually I will be writing this data to the arduino itself, but I need to get past this hurdle first.

Thanks in advance for any help.
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rgilbank
Re: Scraping a web page for data
Reply #1 - Feb 26th, 2009, 2:13am  
Take a look at loadStrings() (http://processing.org/reference/loadStrings_.html).  Very simple to use, just pass it the url as a parameter.
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PhiLho 
Re: Scraping a web page for data
Reply #2 - Feb 26th, 2009, 7:31am  
You probably want split().
Also remember, if needed, to compare strings by using equals(), not ==.
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WWW  
rolandblais
Re: Scraping a web page for data
Reply #3 - Feb 27th, 2009, 6:05pm  
Thanks for the replies.

loadStrings() worked like a charm. I tried that before, and it didn't work, that's why I was trying the other method. But the reason loadStrings didn't work before was due to authentication issues on the webserver I was trying. I changed hosts, and it worked as expected.

Thanks again!
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