| Re: reading a ninary file [message #46958 is a reply to message #46863] |
Sun, 15 January 2006 00:32  |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Dear all
I got more and more unicode files.
the king is dead long lives the new king ....
idl has no unicode support at the momenent. We should add a feature request
about.
cheers
Reimar
Klaus Scipal wrote:
> Hi
>
> I am not a specialist in character encoding but I guess you have to find
> out how it was written. Which encoding was used to convert the characters
> to a byte?
>
> Characters are normally encoded in ASCII format which knows 128
> characters. As computers store data in bytes (i.e. 8 bits) there is room
> to store another set of 128 characters, i.e. an extended character set. In
> practice, there are a number of different extended character sets for
> example for math symbols or extension characters for non-English
> languages. And to make it even more difficult there are also other
> encoding systems then ASCII, for example UNICODE.
>
> I don't know if this is your problem but unless you don't know how the
> data was encoded it will be difficult to "decode" it. I also don't know if
> the
> different character sets are compatible and how IDL converts bytes to
> characters. That's something you have to find out yourself. For more
> details on character binary encoding check out
> http://www.cs.tut.fi/~jkorpela/chars.html#examples
>
> Of course a trial and error method would be to read out the byte and go
> into the standard conversion tables and look what makes most sense.
>
> Klaus
>
>
>
> <claire.maraldi@gmail.com> wrote in message
> news:1136798479.995043.160620@g44g2000cwa.googlegroups.com.. .
>> Hello,
>>
>> I have to read a binary file containing long, fix and string variable
>> type. I know that the string variable type are coded only on one byte
>> (this have been confirmed by someone in the laboratory, and even if I
>> try more bytes there is an "encountoured before end of file" error...).
>> So I have tried to convert only one byte, and the results are amazing
>> characters like "_-", "_"....
>> I know that is not a problem of discrepency when the binary file is
>> read because long and fix variable type are well converted (wether they
>> are placed before or after string).
>>
>> Could explain me what exactly happen please ?
>> Thank you
>>
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