Thank you guys, I finally make the FFI working.

But I found a interesting behavior with in my C++ side of code.  I have made a simple thumbnail generation function in C++ side which include the following snippet of code

```
Blob blob;

try {










On Friday, September 19, 2014 4:50:57 PM UTC+9:30, Erik Hesselink wrote:

Yes, see the documentation for useAsCString [0].

[0] http://hackage.haskell.org/package/bytestring-0.10.4.0/docs/Data-ByteString.html#v:useAsCString

Erik

On Fri, Sep 19, 2014 at 6:32 AM, ye yan <haskell...@gmail.com> wrote:
> I have been play around with Haskell FFI. My question is for ByteString
> (Strict) is there a trailing null append to it when pass to it C functions?
>
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