On Sun, Jan 9, 2011 at 6:05 PM, Aaron Gray wrote:

On 9 January 2011 21:30, Henning Thielemann wrote:

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On Sun, 9 Jan 2011, Aaron Gray wrote:

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I am trying to work out how to use GHC.Ptr, Foreign.Storable, Data.Storable.Endian, and am looking for good examples of usage.

What do you intend to do with them?

An (ABC) ActionScript Byte Code backend for Haskell. Basically I need to write little-endian binary to a file, and was wondering the best way to do this; I need various types including a 24bit type.

Ah, I would recommend the 'binary' package on hackage, specifically the module Data.Binary.Builder. Another recently popular alternative is the 'blaze-builder' package. Although the 24-bit access might be difficult - how are they aligned? I guess with either of these you'd have to peek a Word8 and then a Word16 and then munge them together, depending. Antoine http://hackage.haskell.org/package/binary http://hackage.haskell.org/package/blaze-builder

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The package storablevector uses a lot of Ptr, peek, and poke. Maybe this is of some help.

Okay thanks, Aaron

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On Sun, Jan 9, 2011 at 8:11 PM, Aaron Gray wrote:

On 10 January 2011 01:08, Antoine Latter wrote:

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Although the 24-bit access might be difficult - how are they aligned?

They are non aligned, they are actually used as jump offsets in the byte code.

Hah hah, yes. That would make a lot more sense.

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I guess with either of these you'd have to peek a Word8 and then a Word16 and then munge them together, depending.

Three put/getWord8's would probably be neater.

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http://hackage.haskell.org/package/binary http://hackage.haskell.org/package/blaze-builder

Blaze looks a bit more specialized.

It has a larger surface area and more types, so it can be intimidating, but it has the module 'Blaze.ByteString.Builder.Word' which is an idealogical equivalent to the word primitives in Data.Binary.Builder. Antoine

Many thanks, Aaron

On 9 January 2011 22:34, Henk-Jan van Tuyl wrote:

On Sun, 09 Jan 2011 14:48:09 +0100, Aaron Gray wrote:

Hi,

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I am trying to work out how to use GHC.Ptr, Foreign.Storable, Data.Storable.Endian, and am looking for good examples of usage.

Many thanks in advance,

Aaron

You can lookup, which packages use these, by looking at the reverse dependencies:

http://bifunctor.homelinux.net/~roel/hackage/packages/archive/pkg-list.html

Handy I did not notice that, nice.

Thanks, Aaron

Regards, Henk-Jan van Tuyl

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