Thanks for your suggestion, and sorry for the subject. I have read the introduction of Data.ByteString, it is helpful. And also, there is one problem left. When i read a binary file, data is truncated at the charactor EOF. Which function could do this work correctly ? ------------------ L.Guo 2007-05-24 ------------------------------------------------------------- 发件人：Donald Bruce Stewart 发送日期：2007-05-24 14:03:27 收件人：L.Guo 抄送：MailList Haskell-Cafe 主题：Re: [Haskell-cafe] (no subject) leaveye.guo:

Hi MailList Haskell-Cafe:

Till now, which module / package / lib can i use to access binary file ? And is this easy to use in GHC ?

Data.Binary? Or perhaps just Data.ByteString, available on hackage, http://hackage.haskell.org/cgi-bin/hackage-scripts/package/binary-0.3 or in base. -- Don

And also, there is one problem left. When i read a binary file, data is truncated at the charactor EOF.

Which character is this: ^D or ^Z? Which operating system - Windows, perhaps? And you are reading from a file, not from stdin? -k

marco-oweber:

On Thu, May 24, 2007 at 02:38:05PM +0800, L.Guo wrote:

...

Thanks for your suggestion, and sorry for the subject.

I have read the introduction of Data.ByteString, it is helpful.

And also, there is one problem left. When i read a binary file, data is truncated at the charactor EOF.

You have to use readBinaryFile instead of readFile. I had the same trouble as well.

I finally implemented accessing single characters in C and did use ffi because I didn't know haw to do this i haskell properly. ( using peek/poke functions 4 bytes got written (wihch is annotateted somewhere ) If you are interested I can sent you the modified ByteString package.

If someone can tell me which haskell function to use to set a random char in a memory buffer I would be pleased ..

'poke' or else use unboxed Word8 arrays Check the src for Data.ByteString for examples.