help - Ascii to hex and hex to ascii conversion

[rjagan]

Hi friends,

I need to convert the hex data to ascii java.. commonly, the Hex values are 0 (00) to 127 (7F) are converted and printed correctly, i need to print the value from 128 (80) - 255 (FF)..

How to convert the value.. I tried lot.. any one can help me..

[Toll]

What have you tried, and what were the results?

[rjagan]

private static String asciitohex(String data)
{
char[] chars = data.toCharArray();
StringBuffer hex = new StringBuffer();
StringBuffer hexval = new StringBuffer();
for(char ch : chars)
{
hex.append(Integer.toHexString(ch));
}
return hexval.toString();
}

here is my code friend to convert ascii to hex,
it converts 'R' to '52'..
some it will shows 2018, 201C, 2026, FFFD, 153, 178...
How can i get know the ascii values for these hex values.

[Toll]

Do you have some examples of what is converted to the longer hex values?

[JosAH]

private static String asciitohex(String data)
{
char[] chars = data.toCharArray();
StringBuffer hex = new StringBuffer();
StringBuffer hexval = new StringBuffer();
for(char ch : chars)
{
hex.append(Integer.toHexString(ch));
}
return hexval.toString();
}

here is my code friend to convert ascii to hex,
it converts 'R' to '52'..
some it will shows 2018, 201C, 2026, FFFD, 153, 178...
How can i get know the ascii values for these hex values.

Those are Unicode values; most of them are out of the range of ASCII values but the first 128 [0 ... 127] values are equal in Unicode and ASCII. Don't bother about ASCII, it is old fashioned, work with Unicode code points only.

kind regards,

Jos

[rjagan]

i use these codes to my serial port connection ..
am sending the hex value 31... and the serial port will show result as 1..
then i convert the ascii value to 31..
like these,
32 - 2
33 - 3
41 - A

if i send '95' i will get the hex value 2022
for 96 i will get 2013.. the conversion problem occur in hex values from 80 to 9F...

[Toll]

As said above, char is coded in unicode, not in ASCII. While the lower part of unicode is identical to ASCII (00-7F, hex-wise), extended ASCII does not translate to unicode in the same way. That's why this happens.

[rjagan]

Ok friend, then how can i convert the extended ASCII values to hex..
give me step of help.. to write the program for that conversion

[JosAH]

Ok friend, then how can i convert the extended ASCII values to hex..
give me step of help.. to write the program for that conversion

Don't bother about any conversion: as long as you only use the characters that are present on a US keyboard you can send them as is to your device, e.g.

sendToDevice('1'); // sends hexadecimal value 31
sendToDevice('A'); // sends hexadecimal value 41
...

kind regards,

Jos