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UTF82ASCII (Read 975 times)
balte
UTF82ASCII
May 13th, 2008, 12:47pm  
Hello,

i try to get a text message from the web and display it on a LED display. The problem is that the text, witch comes from the web is in an other codec then my LED display. I think the text is in UTF8 but i am not sure. My LED display understand just ASCII. So that s my question:
How can i change the Codec in Processing?

Thanks for all replyes.
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PhiLho 
Re: UTF82ASCII
Reply #1 - May 13th, 2008, 6:48pm  
"Codec" might not be the right term, rather "encoding".
UTF-8 for Ascii characters (like a-zA-Z0-9 and simple punctuation) is just these characters. Perhaps you receive them in UTF-16 (two bytes per character), which is the standard for Java.
But without more info (what is the exact input? how to do send the result to your hardware?) I can't help much more.
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WWW  
balte
Re: UTF82ASCII
Reply #2 - May 13th, 2008, 7:08pm  
I get the Data like this:

XMLElement rss = new XMLElement(this, url);
 XMLElement[] description = rss.getChildren("channel/item/description");

so i get an array with my Datas.
I send this Array with osc to a second programm wich comunicates with the LED displays. The messages are safed in a String called Text.
My Hardware is steered by RS232 as followed:

void send(String Text) {
   Header();
   port.write(Text);
   port.write(trail);
 }

It works properly but my Display understand just ASCII signs. So i dont know how to engode UTF16 to ASCII.
Any idea?

Thanks for reply
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JohnG
Re: UTF82ASCII
Reply #3 - May 13th, 2008, 7:15pm  
You can get the ASCII version of the string with:

Code:
String Text="wibble";
byte[] data=Text.getBytes("US-ASCII");
port.write(data); //I'm guessing that the write method can take a byte[]
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balte
Re: UTF82ASCII
Reply #4 - May 13th, 2008, 7:34pm  
Thank you for your reply.

I tried to get these code running but the programm get an error message as follows

/tmp/build4708.tmp/Temporary_1999_7000.java:11:13:11:37: Semantic Error: The method "byte[] getBytes(java.lang.String $1) throws java.io.UnsupportedEncodingException;" can throw the checked exception "java.io.UnsupportedEncodingException", so its invocation must be enclosed in a try statement that catches the exception, or else this method must be declared to throw the exception.
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JohnG
Re: UTF82ASCII
Reply #5 - May 13th, 2008, 7:51pm  
Ah right, try this:

Code:
byte[] data;
try
{
  data=Text.getBytes("US-ASCII");
}
catch(Exception e)
{
  e.printStackTrace();
}
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balte
Re: UTF82ASCII
Reply #6 - May 13th, 2008, 8:12pm  
I tried this code like this


String Text="wibble";
byte[] data = new byte[Text.length()];

try
{
 data=Text.getBytes("US-ASCII");
}
catch(Exception e)
{
 e.printStackTrace();
}
print(data);

The result was:

[B@50305e

S dont understand what this program does and i cant understand the result. If i dont make a (new byte[]) the programm would not give me any result.
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JohnG
Re: UTF82ASCII
Reply #7 - May 13th, 2008, 8:30pm  
You don't need to set the data length initially, as it gets wiped and the data put in it.

Use println rather than print, and you'll see the raw data contained in the byte array:
Code:
String Text="wibble";
byte[] data=null;

try
{
  data=Text.getBytes("US-ASCII");
}
catch(Exception e)
{
  e.printStackTrace();
}
println(data);


gives

Code:
[0] 119
[1] 105
[2] 98
[3] 98
[4] 108
[5] 101
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balte
Re: UTF82ASCII
Reply #8 - May 13th, 2008, 9:18pm  
YES, that s it,
now it works properly.
Thanks a lot for your help.

Best regards.
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