udp print to variable

grimm

Dear all,

I am busy with a project and I am sending data from arduino to processing with UDP. I want to store the received data in a variable on the processing side but the example just prints the data. How can I save the printed value in a variable instead of only printing it?

 void receive( byte[] data ) {          // <-- default handler
// void receive( byte[] data, String ip, int port ) {   // <-- extended handler

 for(int i=0; i < data.length; i++) 
 print(char(data[i]));  
 println();   
 }

This is the code used ^

kind regards

Rens

MenteCode

If you printed the variable... then can't you just use the same parameters to save the values to a variable?

Kinda like this?:

char[] store = new char[0];

void receive( byte[] data ) {
  for (int i=0; i < data.length; i++)
    print(char(data[i]));
    store.append(char.data[i]);
  println();
}

I don't know whether you need a global variable or not, and whether your datatype is definitely char, but all of these are assumptions.

grimm

ah that seems easy enough i´ll give it a try! thanks for your help

grimm

huh if I use the variable i in the for loop twice e.g.

void receive( byte[] data ) {
  for (int i=0; i < data.length; i++)
    print(char(data[i]));
    print(char(data[i])); //twice does not work??
    store.append(char.data[i]);
  println();
}

I get this error: Cannot find anything named "i"

full code:

import hypermedia.net.*;

 UDP udp;  // define the UDP object


 void setup() {

 udp = new UDP( this, 6000 );  // create a new datagram connection on port 6000
 //udp.log( true );         // <-- printout the connection activity
 udp.listen( true );           // and wait for incoming message  
  String ip       = "192.168.1.132"; // the remote IP address
 int port        = 8888;        // the destination port

 udp.send("Hello World", ip, port );   // the message to send

 String ip2      = "192.168.1.111"; // the remote IP address
 int port2      = 8888;        // the destination port

 udp.send("Hello World", ip2, port2 );   // the message to send
 }

 void draw()
 {

 }



 void receive( byte[] data ) {          // <-- default handler
// void receive( byte[] data, String ip, int port ) {   // <-- extended handler
 for(int i=0; i < data.length; i++) 
 print(char(data[i])); 
  print(char(data[i])); 
 println();   
 }

GoToLoop

You've forgotten to define the for loop block w/ curly braces! I-)
It's necessary when we got more than 1 statement block! :-\"

Anyways, I've tweaked your code. It's untested since I don't have that 3rd-party library! :-/
But you can at least try it out for yourself:

// forum.processing.org/two/discussion/3081/udp-print-to-variable

import hypermedia.net.*;

UDP udp;  // define the UDP object
ArrayList<byte[]> storage = new ArrayList();

void setup() {
  udp = new UDP(this, 6000);
  //udp.log(true);
  udp.listen(true);

  String ip = "192.168.1.132";
  int port  = 8888;
  udp.send("Hello World", ip, port);

  ip   = "192.168.1.111";
  port = 8888;
  udp.send("Hello World", ip, port);

  println();
  for (byte[] b: storage)  println(b);

  exit();
}


void receive(byte[] data) {
  //void receive(byte[] data, String ip, int port) {
  for (byte b: data)  print((char) b + " - ");
  storage.add(data);

  // Alternative in case storage.add(data); doesn't work correctly:
  //final byte[] dat = new byte[data.length];
  //arrayCopy(data, dat);
  //storage.add(dat);
}