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Index › Programming Questions & Help › Integration › get data from the web - Facebook
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get data from the web - Facebook (Read 3192 times)
Chrisir
get data from the web - Facebook
May 17th, 2010, 12:32pm  

Hello!

I try to use the Facebook-Site to get data.
If you are logged in you can get your friends via
https://graph.facebook.com/774/friends?access_token=ommitted.
where 774 is you FB-ID.
see
http://developers.facebook.com/docs/reference/api/

It returns

{
  "data": [
     {
        "name": "O P",
        "id": "5"
     },
     {
        "name": "M N".................
and so forth - works in the browser. That's what I want to get!
(doesn't look like xml to me...)

anyway.


I try this from a processing Application and I am stuck.

I try to use

Code:
String step0 = "https://graph.facebook.com/774/friends?access_token=ommitted.";
String step1 = "https://graph.facebook.com/778/picture?access_token=ommitted."; 



XMLElement xml;

void setup() {
  size(200, 200);
  xml = new XMLElement(this, step0);

  println(xml.getContent()); // nothing
  // println(xml.getStringAttribute(url));

  int numSites = xml.getChildCount();
  for (int i = 0; i < numSites; i++) {
    XMLElement kid = xml.getChild(i);
    int id = kid.getIntAttribute("id"); 
    String url = kid.getStringAttribute("url"); 
    String site = kid.getContent();
    println(id + " : " + url + " : " + site);    
  }
}


It returns nothing.

So my question is
how can I receive the text with my friend's list in the processing Application.

Thanks!!

Chrisir  Wink
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JohnG
Re: get data from the web - Facebook
Reply #1 - May 17th, 2010, 1:15pm  
That's not XML data, I believe it's JSON format.

http://www.json.org/java/ provides tools to use the data, and convert it to various formats (including XML)
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Chrisir
Re: get data from the web - Facebook
Reply #2 - May 18th, 2010, 12:10pm  


Hello,

Yes, it's JSON.

But I don't get the information on the link you posted.

What is the reader class there?

How can I get information like:
String result = getInformationFromURL (url1);

Thanks!

Chrisir   Wink
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JohnG
Re: get data from the web - Facebook
Reply #3 - May 19th, 2010, 3:23pm  
From what I can tell, you'll need to use the JSONObject.java in your code, then create a JSONObject from the text, which you get with loadString("http://....") (though you'll need to concatenate all the strings returned into one string to pass to the JSONObject constructor.

When you've got the object, you just do String name=myJSONObject.getString("name");
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Chrisir
Re: get data from the web - Facebook
Reply #4 - May 22nd, 2010, 6:05am  
How can I download JSONObject.java?
How do I make it part of my program? Is it a library?

Can you post soe code, please?

Thanks!

Chrisir   Wink
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PhiLho 
Re: get data from the web - Facebook
Reply #5 - May 22nd, 2010, 7:30am  
Chrisir wrote on May 22nd, 2010, 6:05am:
How can I download JSONObject.java
How do I make it part of my program Is it a library

You know, on the page JohnG pointed to The blue underlined texts are links. If you right-click on the JSONObject.java one, your browser should show a context menu item looking like "Download the target of this link". Once downloaded, you should have a Java file you can drop in your sketch's folder. Reopening your sketch, the file should appear in the tabs, and then you can use it.

If I find time, in a few hours (gotta go...) I will myself do that and try to use it, as it interests me too...
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« Last Edit: May 22nd, 2010, 12:00pm by PhiLho  »  
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Chrisir
Re: get data from the web - Facebook
Reply #6 - May 22nd, 2010, 11:03am  
Hello,

It's very complicated:

  • I am not sure if Facebook allows getting data from an app (instead of from another webpage)
    I am not sure if you have to register with Facebook first
    JSONObject.java produces errors, can't run
    it's loadStrings (instead if loadString)
    Maybe processing doesn't allow getting text


I also tried to get my picture from Facebook:

Code:
  myImage1 = loadImage ("https://graph.facebook.com/ChristophRoemhild/picture","jpg" );

  size (600,600) ;  
  image(myImage1, 0, 0);


link works in the browser but not in processing...   Sad

Greetings, Chris  Wink
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PhiLho 
Re: get data from the web - Facebook
Reply #7 - May 22nd, 2010, 12:04pm  
Chrisir wrote on May 22nd, 2010, 11:03am:
I am not sure if Facebook allows getting data from an app (instead of from another webpage)
I am not sure if you have to register with Facebook first

Actually, if you use the API of a site (at least large ones like Facebook, Twitter, etc.), you have to request a developer's key, which must be provided when connecting to the service.
And sometime (often) you are limited in the amount of requests/traffic.
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