Programming Forums - representing the extended ASCII set in Strings

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representing the extended ASCII set in Strings

hi everyone,
im working on a chat application project where the user can enter some text, this text goes into my compression algorithm which outputs a set of 8 bits with values from 0-255. I need to be able to take a value like 150 and change that into a string send it via TCP, recieve it on the other end and convert it back to 150.
so this is some code i have wrote to investigate:

int value = 150;

            sendBytes[i] = (byte)value; //set char of byte



            System.out.println("BYTE = " + (int)sendBytes[i]);

            

            int rep = (int) sendBytes[0] & 0xFF;

            System.out.println("REP = " + rep);

            

            String test = new String(sendBytes,"UTF-8");

from the code above, i found that the number 150 when put into a byte will become a 2's complement number. so 128 will be -128.
the second statement "int rep = ..." will retrieve the original number..so if i say store value 128 in a byte..it will be stored as -128 but when i retrieve it with :

int rep = (int) sendBytes[0] & 0xFF;

System.out.println("REP = " + rep);

i will get the number 128 back which is great!

now i need to be able to send the number -128 or the complement of 150 which is stored in the byte via TCP through a string. how can i do tht?

Re: representing the extended ASCII set in Strings

okay here is the result of a little experiment.. very wierd results!

        byte[] sendBytes = new byte[1];

        String test2 = "";

        for(int value = 0 ; value < 256 ; value++)

        {

            System.out.print(value);

            sendBytes[0] = (byte)value; //set char of byte



            test2 = new String(sendBytes);

            

            byte[] b = test2.getBytes();

            int rep = (int) b[0] & 0xFF;

            System.out.print(","+rep);

            System.out.print("\r\n");

        }

OUTPUT:

AS you can see, this experment basically converts a number to string and back to number, all number are good expect for 129,141,143,144,157 which all convert back to the number 63 which is a "?"

Re: representing the extended ASCII set in Strings

the above experiment was in windows xp. i tried it in linux fedora core 8, the result was all the number from 128 to 255 mapped to 238!