[Haskell-cafe] Regarding Haskell FFI for C/C++ (Passing of String)

[Yves Parès]

(Sorry for the double post)

Forget about ByteString.Char8: it doesn't handle unicode as it truncates
characters.

Going from String to bytestring is easy thanks to the utf8-string (
http://hackage.haskell.org/packages/archive/utf8-string/0.3.7/doc/html/Codec-Binary-UTF8-String.html)
package and pack function from Data.ByteString(.Lazy).

And if you want to convert your String directly to a CString (a Ptr CChar)
you better use Foreign.C.String.withCString.

Le 22 mars 2012 15:17, Yves Parès <yves.pares at gmail.com> a écrit :

> This joins the question I asked two days ago here. (See
> http://haskell.1045720.n5.nabble.com/Quickest-way-to-pass-Text-to-C-code-td5582223.html
> )
> Hope that helps.
>
> Le 22 mars 2012 15:10, rajendra prasad <rajendradprasad at gmail.com> a
> écrit :
>
>> Hi,
>>
>> I have just started learning Haskell FFI. I am trying to send a string
>> from hastell to a C function. For this, I am required to convert the
>> haskell string to byte string. I have two methods to achieve this task.
>> Both are listed below:
>>
>> 1) import Foreign.C.String
>>     let arg1 = map castCharToCChar "Hello" :: [CChar]
>>
>> 2) import qualified Data.ByteString.Char8 as B
>>     f = B.pack "Hello"
>>
>> I just wanted to know the optimal way to achieve this task. Please
>> suggest the optimal way of doing this. If there is any other way, please
>> share it.
>>
>> Also, please suggest me any good tutorial to start with Haskell FFI for
>> C/C++.
>>
>> Thank you very much.
>>
>>
>> Regards,
>> Rajendra
>>
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>>
>
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