Encoding conversion from UTF to ISO-8859-7

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MEARTURO - 30 Jun 2006 12:25 GMT

Hello all,

I have a problem with some encoding conversion from UTF to ISO-8859-7 .
My Oracle database uses UTF but some POS printers in the organization
use ISO-8859-7, so I need to print some Greek characters.

This is part of the code:

Charset set7 = Charset.forName("ISO-8859-7");
ByteBuffer BBtext3 = null,

tempDB = rs.getString(1); //The string in Greek. Oracle UTF
BBtext3 = set7.encode(tempDB); //The string in Greek ISO-8859-7

When I debug this code I see that BBtext3 has these values:
[0] = -51
[1] = -59
[2] = -45
and so on

If I add 256 to those numbers I get:
[0] = 205
[1] = 197
[2] = 211
Which are the positions in ISO-8859-7 of the Greek letters of the UTF
text.

If I send the original string to the printer I get '?' because there is
no such thing as character -51.

What am I missing? How can I complete the conversion from UTF to
ISO-8859-7? It seems that I'm half the way.

Thanks a lot for your time.

Reply to this Message

Bill Medland - 30 Jun 2006 16:21 GMT

> Hello all,
>
[quoted text clipped - 25 lines]
> If I send the original string to the printer I get '?' because there is
> no such thing as character -51.

Huh?
How are you sending 'the original string'? I would expect that the
printer is merely going to receive a string of octets ; it doesn't
matter if we think of them as signed (which java does) or unsigned
(which the printer does); the pattern of bits is the same.
I guess the issue is how to send that byte stream to the printer
without it getting translated.

> What am I missing? How can I complete the conversion from UTF to
> ISO-8859-7? It seems that I'm half the way.
>
> Thanks a lot for your time.

Reply to this Message

MEARTURO - 30 Jun 2006 20:21 GMT

> > Hello all,
> >
[quoted text clipped - 38 lines]
> >
> > Thanks a lot for your time.

Hi,

You have a very good point, the printer expects something like 0D 0F A0
etc.

The problem is that I may have a string with characters from the base
character set (ASCII) and from the extended set (Greek) for instance a
street name in Greek + the number of the street. The conversion leaves
the 'number of the street' intact and the bytes representing the greek
letters in -59, which seems to be a relative position from the top of
ISO-8859-7.

Thanks a lot for your suggestion.

Reply to this Message

Oliver Wong - 06 Jul 2006 19:03 GMT

> Hello all,
>
[quoted text clipped - 28 lines]
> What am I missing? How can I complete the conversion from UTF to
> ISO-8859-7? It seems that I'm half the way.

Don't send "the original String". Send the bytes.

- Oliver

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Encoding conversion from UTF to ISO-8859-7

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