Re: [Openexr-devel] UNICODE support in openexr file I/O

[Florian Kainz]

Do you want to read and write files with Unicode names,
or do you want to store Unicode strings in the files?

Opening files with Unicode names is possible, provided
you write your own low-level file I/O classes (see
http://www.openexr.com/ReadingAndWritingImageFiles.pdf,
pages 22 to 24).  You should be able to write code that
looks like this:

    MyIstream istr ("กรุงเทพมหานคร");
    TiledRgbaInputFile file (istr);
    ...

As Chris Cox already mentioned, storing wchar_t strings
is not a good idea; the representation of wchar_t is
implementation-dependent.  Unicode strings that go into
the file should be converted to UTF-8 encoding.
UTF-8 Unicode strings consist of regular chars, so they
can be stored in an OpenEXR file.

The IlmImf library does not currently support conversion
between wchar_t and UTF-8; you will have to do the
conversion yourself.  (By the way, if you have a simple
and portable way to do this, you may want to contribute
it to the OpenEXR project.)

Florian




Santiago wrote:
> All the OpenEXR classes ( like TiledRgbaOutputFile ) only accepts old 
> ASCII "const char*" parameter to read/write files.... That's bad because 
> if I wanna name a file using extended characters like Ñç or even Kanji, 
> I can't .... Please... can you provide too a wchar_t version so we can 
> use plenty the UNICODE characters? thx
>
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