Re[2]: [Haskell-cafe] Umlauts in command line arguments

[Bulat Ziganshin]

Hello Eric,

Friday, June 5, 2009, 12:17:42 AM, you wrote:

>> I'm using ghc 6.10.2 on Win XP. Are there any known solutions for this
>> problem?

> Your question has inspired me to add a System.Environment.UTF8 module
> to utf8-string 0.3.5

> This module behaves like the System.IO.UTF8 wrapper.

it is useless on Windows, since it passes cmdline in ANSI code page
rather than UTF-8. proper windows solution is using *W version of
WIN API function to get UTF-16 string and then decode it


-- 
Best regards,
 Bulatmailto:bulat.zigans...@gmail.com

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Re[2]: [Haskell-cafe] Umlauts in command line arguments

[Bulat Ziganshin]

Hello Gwern,

Monday, June 1, 2009, 4:35:25 AM, you wrote:

> GHC mangles UTF by default. You probably want to use one of the utf8
> packages; eg.
> http://hackage.haskell.org/cgi-bin/hackage-scripts/package/utf8-string
> or
> http://hackage.haskell.org/cgi-bin/hackage-scripts/package/utf8-light

> (Neither of them seems to allow for accessing *arguments* rather than
> stdin/stdout, but you could probably do something with the
> encoding/decoding functions.)

in order to get proper unicode handling, one should ask win api
directly for cmdline:

myGetArgs = do
   alloca $ \p_argc -> do
   p_argv_w <- commandLineToArgvW getCommandLineW p_argc
   argc <- peek p_argc
   argv_w   <- peekArray (i argc) p_argv_w
   mapM peekTString argv_w >>== tail

foreign import stdcall unsafe "windows.h GetCommandLineW"
  getCommandLineW :: LPTSTR

foreign import stdcall unsafe "windows.h CommandLineToArgvW"
  commandLineToArgvW :: LPCWSTR -> Ptr CInt -> IO (Ptr LPWSTR)

-- 
Best regards,
 Bulatmailto:bulat.zigans...@gmail.com

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