Hi,

I would like to display the comments of all <rev>-nodes of a wikipedia XML file. I don't know why, but my children array must be empty because I get an IndexOutOfBounds Exception (= 0) when I want to print the array content.

Any ideas?

Thanks
Marcus

Code:

import processing.core.*;
import processing.xml.*;

public class Wikipedia04 extends PApplet {

  public static void main ( String args[] ) {
    PApplet.main( new String[]{"Wikipedia04"} );
  }

  public void setup ()
  {


  

  background(0);

  size(100,100);

  

  String url = "http://de.wikipedia.org/w/api.php?format=xml&action=query∝=revisions&titles=Burg&rvprop=timestamp|user|comment|size|flags&rvlimit=100";

  

  XMLElement xml = new XMLElement(this, url);


  XMLElement[] children = xml.getChildren("api/query/pages/page/revisions");

  for (int i=0; i <= xml.getChildCount(); i++) {


  println(children[i].getStringAttribute("comment"));

  }

  }

  public void draw ()
  {

  }

}
 

I found several things in your code:

1.
There were some strange chars in the url "...&#8733;=revisions&...", instead of "..."prop=revisions&..."

2.
For some reason, that I also do not understand completely, the path you give in getChildren has be like that:
"query/pages/page/revisions/rev"
So, without "api/"

3.
You must not iterate over xml.getChildCount() because that's again the root node.

The following code worked for me in Processing (0157):

Code:

import processing.core.*;
import processing.xml.*;

void setup () {
  size(100,100);
  background(0);

  String url = "http://de.wikipedia.org/w/api.php?format=xml&action=query&prop=revisions&titles=Burg&rvprop=timestamp|user|comment|size|flags&rvlimit=100";

  XMLElement xml = new XMLElement(this, url);
  XMLElement[] children =  xml.getChildren("query/pages/page/revisions/rev");

  for (int i=0; i < children.length; i++) {
    println(children[i].getStringAttribute("comment"));
  }

}