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Diff b/w ANSI and UTF-8 encoding

Posted on 2006-06-23
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Hi All,

First of all I intend to know what is the difference between ANSI encoding and UTF-8 encoding. Say for ex, if I do have a file, how can I test whether that is a ANSI file or a UTF-8 file or how do I prove that a given file is a UTF-8 file.

Also, can I determine the hex values of a given UTF-8 file and compare them with unicode values.

I intend to know more about ANSI,ASCII,unicode,utf-8 etc. Any basic tutorial, plz give the link.

Regards

Nikhil Bansal
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Question by:nikhilbansal
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CEHJ earned 20 total points
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>>Say for ex, if I do have a file, how can I test whether that is a ANSI file or a UTF-8 file

You can't necessarily. If there is no utf8 marker at the beginning of the file (very common), the two files could be identical

>>Also, can I determine the hex values of a given UTF-8 file and compare them with unicode values.

Yes. If you use a Reader, the file will be read into Unicode values (Java String is more or less composed of Unicode values)

http://en.wikipedia.org/wiki/UTF-8

Other encodings are similar - they simply use a specific byte value for each character. This is a very common encoding for English speaking countries:

http://www.sigma-software.freeserve.co.uk/protean/misc/iso8859-1.htm
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by:CEHJ
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Thanks - but why the 'B'? ;-)
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by:nikhilbansal
ID: 16975166
Hi CEHJ,

Why are there so many encodings even in Unicode for ex UTF-8,UTF-16, UTF-32. I mean why can't we have just one encoding.

I'm a novice to encodings. I would like to go through some tutorial which explains me in and out of encodings, charsets etc

Regards

Nikhil
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by:CEHJ
ID: 16975632
>>Why are there so many encodings even in Unicode

They have different histories and purposes. e.g. why represent characters as two bytes long when you can represent some as one? That's what UTF-8 does. It represents 'ASCII' characters in one byte. The downside is that some must be represented in three bytes.
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