On Mon, Oct 27, 2003 at 08:47:41PM +0100, Christian Buschmann wrote:
Hi! I've got following problem. If I enter in ghci following line: Prelude Foreign.C> castCCharToChar $ castCharToCChar 'ü' I would expect that this returns 'ü', but it returns '\252'. Is this the correct behaviour? Or am I doing something wrong? Or are there any problems with language specific characters and CChar?
The problem is a CChar is (most likely) 8 bits while a Haskell Char is a 32 bit unicode value. the correct thing to do to talk unicode values with C code can depend on what you are trying to do, if you know your system is utf8 (many are) and don't mind being somewhat unportable, then the easist thing to do is just hard code that in http://repetae.net/john/computer/haskell/UTF8.hs will do it. (code stolen from someone else) if you want to use the proper locale settings, then things get trickier but this should do it for many apps but requires the ffi http://repetae.net/john/computer/haskell/CWString.hsc otherwise, you may need to write your own ffi code which uses 'iconv' to do the proper character set conversion. This is a well known deficiency in the haskell libraries at the moment... John -- --------------------------------------------------------------------------- John Meacham - California Institute of Technology, Alum. - john@foo.net ---------------------------------------------------------------------------