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Class PApplet is not reading a file

[1 Reply]
- 11-Aug-2010 04:12 PM
- Forum: Programming Questions
Hi, I'm having a problem here reading a file from a Class.

I'm working on a .glif files reader (typographic info), basically an XML reader, and I don't have any problem accessing the files (with the XMLElement constructor) from the main program but when I try to access the file from a class I get a NullPointerException. The comments are in catalan, sorry.

Here's the code:

///////////// Main program

XMLElement xml;

Lletra exemple;

void setup() {

  smooth();

  noStroke();

  size(1200, 1200);



  exemple = new Lletra("A_");

  exemple.setup();

  println(exemple.nodes.length);



  translate(width, height/1.5);

  rotate(PI);



  beginShape();



  for(int i = 0; i < exemple.nodes.length; i++){



   if (exemple.nodes[i].tipus == null){

   println("Res de res");

   }else if (exemple.nodes[i].tipus.equals("curve")){

   bezierVertex(exemple.nodes[i-2].x, exemple.nodes[i-2].y, exemple.nodes[i-1].x, exemple.nodes[i-1].y, exemple.nodes[i].x, exemple.nodes[i].y);

   }else{

   vertex(exemple.nodes[i].x, exemple.nodes[i].y);

   println(exemple.nodes[i].x + " / " + exemple.nodes[i].y);

   }



  }



  endShape(CLOSE);

}

///////////// Class Lletra

class Lletra extends PApplet {



  //Variables

  String nomLletra;

  XMLElement xml, nom;

  XMLElement[] punts;

  int numNodes;

  Punt[] nodes;



  //Constructor

  public Lletra (String nomLletra){

   this.nomLletra = nomLletra;

  }



  void setup(){



   //Obre l'arxiu XML

   xml = new XMLElement(this, "Kids/glyphs/" + nomLletra + ".glif");



   //Carreguem els punts en un array de XMLElements

   punts = xml.getChildren("outline/contour/point");



   //Iniciem l'array que contindra els punts de la lletra

   nodes = new Punt[punts.length];

   for (int i = 0; i < punts.length; i++){



   nodes[i] = new Punt(punts[i].getIntAttribute("x"), punts[i].getIntAttribute("y"), punts[i].getStringAttribute("type"));



   }



  }



  public void loadLletra(){



  }



}

Here's the error code I get:

Kids/glyphs/A_.glif does not exist or could not be read

processing.app.debug.RunnerException: NullPointerException

at processing.app.Sketch.placeException(Sketch.java:1543)

at processing.app.debug.Runner.findException(Runner.java:583)

at processing.app.debug.Runner.reportException(Runner.java:558)

at processing.app.debug.Runner.exception(Runner.java:498)

at processing.app.debug.EventThread.exceptionEvent(EventThread.java:367)

at processing.app.debug.EventThread.handleEvent(EventThread.java:255)

at processing.app.debug.EventThread.run(EventThread.java:89)

Exception in thread "Animation Thread" java.lang.NullPointerException

at java.io.Reader.<init>(Reader.java:61)

at java.io.BufferedReader.<init>(BufferedReader.java:76)

at java.io.BufferedReader.<init>(BufferedReader.java:91)

at java.io.LineNumberReader.<init>(LineNumberReader.java:52)

at processing.xml.StdXMLReader.<init>(StdXMLReader.java:178)

at processing.xml.XMLElement.parseFromReader(XMLElement.java:247)

at processing.xml.XMLElement.<init>(XMLElement.java:222)

at UFOfal$Lletra.setup(UFOfal.java:71)

at UFOfal.setup(UFOfal.java:29)

at processing.core.PApplet.handleDraw(PApplet.java:1583)

at processing.core.PApplet.run(PApplet.java:1503)

at java.lang.Thread.run(Thread.java:613)

Any Guess??

Opening a text file

[8 Replies]
- 30-Jun-2010 06:55 AM
- Forum: General Discussion
Hi!

This has to be an easy question, but I've trying to figure out for a long time and i just don't get anywhere. I'm trying to open a text file in my data folder, not to read it but to write something in it. I'm trying createWriter() but this function creates a file or overwrite the existing one.

How can I open and write on an existing text file?

Thank you!

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