Processing 1.0 - Processing Discourse - ProXML and the PApplet

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Index › Processing Development › Libraries, Tool Development › ProXML and the PApplet

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ProXML and the PApplet (Read 1566 times)

4dplane

ProXML and the PApplet
Mar 10^th, 2006, 7:31pm

Hi,

I have successfully worked with this proXML example - http://texone.org/proxmlapplet/proxml_test.pde

Now I have been trying to move the XML parsing code to a different class that does not have a setup() and I can not get it to work. It seems this line of code:

xmlInOut = new XMLInOut(this);

…has to be in setup() so the “this” resolves to the PApplet. OK – is there a way to load XML data into a different class that does not have a setup().

Example:

newClass nc1 = new newClass ();

void setup() {
size(1280, 1000, P3D);
//background(88,88,88);
framerate(25);
noStroke();
loop();
}
void draw() {
}

class newClass{
newClass(){
//LOAD THE XML DATA HERE
}
}

Thanks,

4dplane

tex

Re: ProXML and the PApplet
Reply #1 - Mar 10^th, 2006, 10:44pm

Hi

Try it this way

Code:



newClass nc1;
newClass2 nc2;

XMLInOut xmlInOut;
 
void setup() {
  size(1280, 1000, P3D);
  //background(88,88,88);
  framerate(25);
  noStroke();
  loop();
  
  xmlInOut = new XMLInOut(this);
  
  //be aware you have to initialize xmlinout first
  //otherwise you would get a nullpointerexception
  nc1 = new newClass ();

  //here you give an reference to xmlInOut 
  //directly to the class you have to it this way
  //if your class is defined in an java file 
  nc2 = new newClass2(xmlInOut);
}

void draw() {
}
 
class newClass{
  
  XMLElement xmlElement;

  newClass(){
    xmlElement= xmlInOut.loadElementFrom("xmlElement.xml"); 
  }
} 

// other way
class newClass2{
  
  XMLElement xmlElement;
  XMLInOut xmlInOut;

  newClass(XMLInOut xmlInOut){
    this.xmlInOut = xmlInOut;
    xmlElement= xmlInOut.loadElementFrom("xmlElement.xml"); 
  }
}

4dplane

Re: ProXML and the PApplet
Reply #2 - Mar 11^th, 2006, 9:17am

Thanks, I have been working with the second way you described and this is the error I can't seem to work around:

C:/DOCUME~1/main/LOCALS~1/Temp/build33363.tmp/Temporary_4521_8302.java:41:15:41:
49: Semantic Error: The method "proxml.XMLElement loadElementFrom(java.lang.String $1) throws proxml.InvalidDocumentException;" can throw the checked exception "proxml.InvalidDocumentException", so its invocation must be enclosed in a try statement that catches the exception, or else this constructor must be declared to throw the exception.

error from

class newClass{
XMLElement dataSet;
XMLElement data;
XMLElement source;
XMLInOut xmlInOut;
newClass(XMLInOut xmlInOut){
this.xmlInOut = xmlInOut;
dataSet = xmlInOut.loadElementFrom("dat.xml"); //<-error
}
}

tex

Re: ProXML and the PApplet
Reply #3 - Mar 11^th, 2006, 9:46am

Oh I forgot

You have to handle the exception. Exceptions are usefull to handle errors that can appear in your programms.

Code:


 class newClass{
  XMLElement dataSet;
  XMLElement data;
  XMLElement source;
  XMLInOut xmlInOut;
  
  newClass(XMLInOut xmlInOut){
    this.xmlInOut = xmlInOut;
    
    try{
	dataSet = xmlInOut.loadElementFrom("dat.xml"); //<-error
    }catch(InvalidDocumentException ide){
	println("Problems on loading dat.xml");
    }
 }
}

xmlInOut.loadElementFrom throws an exception if it cannot load the element, so you have to define how this exception has to be handled. To do that you set the code part that can throw an exception in the try block. in the catch block you can define what has to be done if an error appears.

4dplane YaBB Newbies Offline Posts: 45	Re: ProXML and the PApplet Reply #4 - Mar 12^th, 2006, 3:04am Perfect! Thanks tex, 4dplane

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