how to execute link() once when the webpage is already loaded

aj85

hi i'm trying to use rfid module with processing.

my plan is like when rfid tag is read , then link some url

but the problem is the rfid reader keep reading and keep page loaded.

how to solve this problem ? I would like loading url when rfid is read, not loading url when url already loaded

I think I should use boolean but I have no idea how to use it.

here is my code

    import processing.serial.*;

    Serial myPort;  // Create object from Serial class

    String dummy;

    void setup()
    {
    size(200,200);
    background(255);

    myPort = new Serial(this, Serial.list()[8], 9600); 

    dummy=" ";

    }
    void draw()
    {


      byte[] inBuffer = new byte[7];
      while (myPort.available() > 0) {
        inBuffer = myPort.readBytes();
        myPort.readBytes(inBuffer);
        if (inBuffer != null) {

          String myString = new String(inBuffer);


          println(myString);
          //println(myString.length());
          //dummy=myString.substring(0,2);
          //print(dummy);

         dummy=myString;

         if(dummy.equals("139") ==true) { 
         fill(0);
         rect(0,0,150,150);
          println("received 139");
          link("http://allrecipes.com/search/default.aspx?ms=0&origin=Home+Page&rt=r&qt=i&wt=potato&pqt=i&fo=0"); 

         }

         if(dummy.equals("187") ==true) { 
         fill(150);
         rect(0,0,150,150);
          println("received 187");
          link ("http://allrecipes.com/search/default.aspx?ms=0&origin=Home+Page&rt=r&qt=i&pqt=i&fo=0&wt=potato&w0=carrot&w1=onion"); 

         }

        } 


      } 

PhiLho

General advice: in general, you can, and should, replace
if(dummy.equals("xxx") ==true) { with
if (dummy.equals("xxx")) {

Have a global boolean, eg. linkOpened.
When you call link(), set this variable to true.
And change the test to:
if (!linkOpened && dummy.equals("xxx")) {

Thus, you open a link only if not already done.

You can reset the variable to false after a while (use millis()).

aj85

yes I know what you mean

so do I have to declare boolean above ? like this :

boolean linkOpened = true;

and then

    if (!linkOpened && dummy.equals("xxx")) {
     link("something"); 
    }

right??
about using millis() I should look into reference

thanks

PhiLho

linkOpened should be false (the default) initially: you haven't opened the link yet! Set it to true after the call to link().

aj85

ah okay I see !!

it's like this :

import processing.serial.*;

Serial myPort;  // Create object from Serial class

String dummy;

boolean linkOpened = false;

void setup()
{
size(200,200);
background(255);
//String portName = Serial.list()[8]; //change the 0 to a 1 or 2 etc. to match your port
myPort = new Serial(this, Serial.list()[8], 9600); 
//val = "";
dummy=" ";
}
void draw()
{

// Expand array size to the number of bytes you expect
  byte[] inBuffer = new byte[7];
  while (myPort.available() > 0) {
    inBuffer = myPort.readBytes();
    myPort.readBytes(inBuffer);
    if (inBuffer != null) {

      String myString = new String(inBuffer);


      println(myString);
      //println(myString.length());
      //dummy=myString.substring(0,2);
      //print(dummy);

     dummy=myString;

     if(!linkOpened && dummy.equals("187")) { 
     fill(0);
     rect(0,0,150,150);
      println("received 59");
      link("http://mj3989.tumblr.com"); 
      linkOpened = true;
     }

     if(!linkOpened && dummy.equals("139")) { 
     fill(150);
     rect(0,0,150,150);
      println("received 139");
      link ("http://melaniejnewbould.tumblr.com"); 
      linkOpened = true;
     }

    } 


  } 



  }