Prelude.writeFile with a Chinese file name

Question

I'm testing something that like to output content to file, which has a Chinese name.

The file would be created successfully with right content but not file name.

I take a look at the function writeFile^1 and it represents file name using String. So I suspect this might be root cause.

    file :: FilePath
    file = "上海万达影城.html"

    content :: String
    content = "<h1>hello</h1>"

    write2File :: IO ()
    write2File = writeFile file content

Thanks your help!

-Simon

--------------------- Updated

GHC at my side is 7.0.2

A workaround found before upgrade. see detail below and the code change like

import qualified Codec.Binary.UTF8.String as UTF8
file = UTF8.encodeString "上海万达影城.html"

http://stackoverflow.com/questions/3412577/haskell-char-unicode-and-turkish — Don Stewart, Apr 17 '12 at 12:26
Works here with ghc-7.4.1 what compiler version and OS have you? — Daniel Fischer, Apr 17 '12 at 12:27
@Daniel, I'm working at ghc-7.0.2 actually thus I think I'll firstly try solution mentioned by Dietrich Epp. — Simon, Apr 17 '12 at 12:38

score 3 · Accepted Answer · edited May 23 '17 at 10:08

String is a list of unicode code points in Haskell. The interpretation of that list of unicode code points is system dependent. (You also need a not too old GHC to support this).

Generally though, once you're locale is set correctly, things just work.

N.B. there have been caveats in the past -- e.g. the old bug: System.Directory.getDirectoryContents unicode support - which might involve workarounds.

score 0 · Answer 2 · answered Apr 17 '12 at 12:32

0

In the meantime, you can use the System.Posix.IO.ByteString module. This will let you specify file paths as byte strings, so you can do the encoding/decoding yourself.

This is a known bug, and was fixed in 7.2.1.

http://hackage.haskell.org/trac/ghc/ticket/3307

answered Apr 17 '12 at 12:32

Dietrich Epp

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Seems unix-2.5.* package has `System.Posix.IO.ByteString` but I'm working on unix-2.4. I'll verify it again after I got chance to upgrade GHC. Thanks Dietrich. – Simon Apr 17 '12 at 13:03

Prelude.writeFile with a Chinese file name

2 Answers2