Scott Fitzgerald

I'm hoping to use net.udp.send (or a varient thereof) to send raw

bytes over a local network. Unfortuantely, the receiving hardware

can't decode the datagram packets it currently spits out.

I've seen some threads about getting net.udp.recv to get bytes, but

My java skills are fairly ruimentary, so any advice or pointers on how

to get this up and running would be great.

I'm hoping to use net.udp.send (or a varient thereof) to send raw
bytes over a local network.  Unfortuantely, the receiving hardware
can't decode the datagram packets it currently spits out.

I've seen some threads about getting net.udp.recv to get bytes, but
nothing on sending.

My java skills are fairly ruimentary, so any advice or pointers on how
to get this up and running would be great.

sending-raw-bytes-with-net-udp-send

last year i was attempting this w/ a friend in order to control some 

ColorKinetics lights. our engineer friend at ColorKinetics ended up 

hacking the receiving hardware before i got to making the needed 

external (and sadly he passed away last fall).

sorry i can't be more helpful, but here are some good links i came 

http://java.sun.com/docs/books/tutorial/networking/datagrams

http://java.sun.com/docs/books/tutorial/networking/TOC.html

http://java.sun.com/j2se/1.5.0/docs/api/java/net/DatagramSoc

http://java.sun.com/j2se/1.5.0/docs/api/java/net/DatagramPac

http://www.codeguru.com/java/tij/tij0166.shtml

http://homepages.uel.ac.uk/2795l/pages/javaapps.htm

http://www.javaworld.com/javaworld/javatips/jw-javatip40.htm

last year i was attempting this w/ a friend in order to control some  
ColorKinetics lights. our engineer friend at ColorKinetics ended up  
hacking the receiving hardware before i got to making the needed  
external (and sadly he passed away last fall).

sorry i can't be more helpful, but here are some good links i came  
across in my research:

  http://java.sun.com/docs/books/tutorial/networking/datagrams /index.html
http://java.sun.com/docs/books/tutorial/networking/TOC.html
  http://java.sun.com/j2se/1.5.0/docs/api/java/net/DatagramSoc ket.html
  http://java.sun.com/j2se/1.5.0/docs/api/java/net/DatagramPac ket.html

http://www.codeguru.com/java/tij/tij0166.shtml
http://homepages.uel.ac.uk/2795l/pages/javaapps.htm
  http://www.javaworld.com/javaworld/javatips/jw-javatip40.htm l

ha! that's the exact thing i'm looking to do.

previously i've used Masayuki Akamatsu's aka.datagram to send the

bytes, but now i'm working on either macintel or windows. the

performance is there under osx, but i'm afraid to push it too much

i also figured, why not get some more java working. (the prebuilt

objects work brilliantly for local networks)

thanks for the links, i'll poke through them and let you know what i

previously i've used Masayuki Akamatsu's aka.datagram to send the
bytes, but now i'm working on either macintel or windows.  the
performance is there under osx, but i'm afraid to push it too much
under emulation.

i also figured, why not get some more java working.  (the prebuilt
objects work brilliantly for local networks)

thanks for the links, i'll poke through them and let you know what i
come up with!

really! you got aka.datagram to work with CK lights? that's great :)

is your method/patch something you'd be willing to share?

really! you got aka.datagram to work with CK lights? that's great :)
is your method/patch something you'd be willing to share?

i'm no java guru at all, but i use the code snippet below 

successfully in an installation to send raw bytes over udp. it's 

pretty much the same as for receiving raw bytes. just make sure to 

convert the input (in my case a string) to bytes.

        int packSize = s.length();

        byte[] buffer = new byte[packSize];            // allocate data buffer

        //convert message to bytes and fill buffer

            buffer[i] = (byte)s.charAt(i);

            servAddr = InetAddress.getByName(host);

            sock = new DatagramSocket();

            post("packet sent");

            // create UDP-Packet to send

            DatagramPacket packet = new DatagramPacket(buffer, packSize, 

            // send the packet

            sock.send(packet);

            sock.disconnect();

            System.err.println(e);

hi,
here is some more to poke around.
i'm no java guru at all, but i use the code snippet below  
successfully in an installation to send raw bytes over udp. it's  
pretty much the same as for receiving raw bytes. just make sure to  
convert the input (in my case a string) to bytes.
hth,
volker.

	public void send(String s) {
		int packSize = s.length();
		DatagramSocket sock;
		byte[] buffer = new byte[packSize];			// allocate data buffer

		//convert message to bytes and fill buffer
		for(int i=0; i
			buffer[i] = (byte)s.charAt(i);

		try {
			servAddr = InetAddress.getByName(host);
			sock = new DatagramSocket();
			post("packet sent");
			// create UDP-Packet to send
			DatagramPacket packet = new DatagramPacket(buffer, packSize,  
servAddr, port);
			// send the packet
			sock.send(packet);
			sock.disconnect();
		}
		catch(IOException e) {
			System.err.println(e);
		}

i did something like this a while ago, using aka.datagram

t=msg&goto=33697&rid=0&S=696731e1d094c2b91b00c8a 9532d31ff&sr ch=rekveld+u 

-------------------------------------------

"The mystery of the world is the visible, not the invisible"

  t=msg&goto=33697&rid=0&S=696731e1d094c2b91b00c8a 9532d31ff&sr ch=rekveld+u 
dp+patch#msg_33697>

                         Joost Rekveld
-----------    http://www.lumen.nu/rekveld

"The mystery of the world is the visible, not the invisible"
(Oscar Wilde)

-------------------------------------------


Hi Volker, I'm trying to use your code to do exactly what you did -- send a list as bytes rather than ASCII (as the mxj net.udp.send does). I'm running into a few problems (to put it mildly). One that I can't figure out is:

C:Program FilesCycling '74MaxMSP 4.6Cycling '74javaclassesnetudpsend.java[ 42 ] cannot find symbol

It claims there's no method "charAt(int)", but the code I used is essentially identical to yours:

byte[] buffer = new byte[packSize]; // allocate data buffer

Any ideas? I'm pretty desperate to get this working ASAP, and it's really frustrating that this small formatting detail could undermine all the other work that's already happened.

C:Program FilesCycling '74MaxMSP 4.6Cycling '74javaclassesnetudpsend.java[ 42 ] cannot find symbol
symbol  : method charAt(int)
location: class com.cycling74.max.Atom[]
buffer[i] = (byte)a.charAt(i);

public void list(Atom[] a) {
int packSize = a.length;
byte[] buffer = new byte[packSize];  // allocate data buffer
for (int i=0; i
buffer[i] = (byte)a.charAt(i);
}
		us.send(a);
}

On 16 Feb 2008, at 03:14, Seejay James wrote:

> Hi Volker, I'm trying to use your code to do exactly what you did 

> -- send a list as bytes rather than ASCII (as the mxj net.udp.send 

> does). I'm running into a few problems (to put it mildly). One that 

> C:Program FilesCycling '74MaxMSP 4.6Cycling '74javaclasses

> etudpsend.java[ 42 ] cannot find symbol

> location: class com.cycling74.max.Atom[]

> It claims there's no method "charAt(int)", but the code I used is 

> byte[] buffer = new byte[packSize]; // allocate data buffer

not quite. in my code i was using "charAt(int)" on a String not an 

please send a private email to me, if you need further help.

>
> Hi Volker, I'm trying to use your code to do exactly what you did  
> -- send a list as bytes rather than ASCII (as the mxj net.udp.send  
> does). I'm running into a few problems (to put it mildly). One that  
> I can't figure out is:
>
> C:Program FilesCycling '74MaxMSP 4.6Cycling '74javaclasses
> etudpsend.java[ 42 ] cannot find symbol
> symbol  : method charAt(int)
> location: class com.cycling74.max.Atom[]
> buffer[i] = (byte)a.charAt(i);
>
> It claims there's no method "charAt(int)", but the code I used is  
> essentially identical to yours:
>
> public void list(Atom[] a) {
> int packSize = a.length;
> byte[] buffer = new byte[packSize];  // allocate data buffer
> for (int i=0; i
> buffer[i] = (byte)a.charAt(i);
> }
> 		us.send(a);
> }

hi seejay,
not quite. in my code i was using "charAt(int)" on a String not an  
Atom[].
please send a private email to me, if you need further help.
volker.

sending raw bytes with net.udp.send