oscP5 string problem with OscMessage

kasperkam..

oscP5 string problem with OscMessage

in Contributed Library Questions • 2 years ago

Hi,

I try to make a Scratch <> OSC bridge.

However have some problem to convert incoming string to a custom OSCMessage. It seems that OscMessage doesn't recognize the incoming part of the String.

String received from Scratch: sensor-update "position" -87.0

Could it be an encoding problem? Since Scratch encodes strings as UTF-8.
Or is it related to the library?

String receivedString = scratchClient.readString();
println("incoming string: "+receivedString);
String[] tokens = splitTokens(receivedString);
String scratchMessageType = tokens[0];
println("incoming scratch message type: "+scratchMessageType);
// send OSC message
//String sendOscString = "/scratch/"+scratchMessageType+"/"; // doesn't work
String sendOscString = new String("/scratch/"+scratchMessageType+"/"); // doesn't work
//String sendOscString = "/scratch/"; // works
OscMessage myMessage = new OscMessage(sendOscString);
myMessage.add(123);
oscP5.send(myMessage, myRemoteLocation);

My Processing code including a Scratch example in a zip-file

If you try it with Scratch don't forget to enable the remote connections. See this post.

Kasper

Replies(2)

kasperkam..

Re: oscP5 string problem with OscMessage

2 years ago

I could solve the problem. println() doesn't show 0 byte characters. Since a Scratch message always starts with 4 zero-bytes, I had to remove them.

At first I've tried this line found in the Processing forum: byte[] b=(new String("Föô bár").getBytes("UTF-8"));

Anyone an idea why I get this error in Processing 1.5.1: Unhandled exception type UnsupportedEncodingException

I ended up using a function found here in the forum called convertencoding().

The code that works now.
Any tips to make this better or more efficient are welcome too.

void draw(){
// Wait for a message from Scratch
if (scratchClient.available()>0) {
String receivedString = scratchClient.readString();
if(receivedString.length()>4)
{
receivedString = receivedString.substring(4, receivedString.length());
println(convertencoding(receivedString));
String[] tokens = splitTokens(receivedString);
String scratchMessageType = tokens[0];
// send OSC message
String sendOscString = "/scratch/"+scratchMessageType+"/";
OscMessage myMessage = new OscMessage(sendOscString);
myMessage.add(123);
oscP5.send(myMessage, myRemoteLocation);
}
scratchClient.clear();
}
}

PhiLho

Re: oscP5 string problem with OscMessage

2 years ago

" Anyone an idea why I this error in Processing 1.5.1: Unhandled exception type UnsupportedEncodingException"
It means you must put the conversion code (getBytes()) inside a try/catch block handing the above exception.
This is because you provide it with a string which can be incorrect (it is checked at runtime, not at compilation time). That's another case where checked exceptions are an annoyance...