[Caml-list] reading bytes into c-defined structs

[Caml-list] reading bytes into c-defined structs

[henri dubois-ferriere]

Hi,
I have a little ocaml app which needs to read/write packets from a
serial device.

The different packet types are originally defined as c structs and i
would like to  be able to read the incoming bytes and convert them
into ocaml records with as much automation as possible.

Is there any way to automate this process? CamlIDL will automate the
process of translating the c structs into ml, which is a first step,
but are there any tools which would allow me to then populate the ml
record from an incoming set of bytes?

Any tips/pointers appreciated!


Henri

-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners

Re: [Caml-list] reading bytes into c-defined structs

[Shishir Ramam]

Henri,
One way to do this would be to 
1. Write a C function that will actually read the bytes and populate the C 
    data structure, and return that data structure. 
2. Put this function in your idl file, and CamlIDL will generate the necessary
    code to make the C call *and* do the necessary translation into the Ocaml 
    record.
3. All you then have to do it call the function in Ocaml whenever you'd like to 
    read a packet.

This is pretty neat, and works well in my experience.

Hope this helps.
-shishir



On Sun, 29 Aug 2004 01:00:49 +0200, henri dubois-ferriere
<henridf@gmail.com> wrote:
> Hi,
> I have a little ocaml app which needs to read/write packets from a
> serial device.
> 
> The different packet types are originally defined as c structs and i
> would like to  be able to read the incoming bytes and convert them
> into ocaml records with as much automation as possible.
> 
> Is there any way to automate this process? CamlIDL will automate the
> process of translating the c structs into ml, which is a first step,
> but are there any tools which would allow me to then populate the ml
> record from an incoming set of bytes?
> 
> Any tips/pointers appreciated!
> 
> Henri
> 
> -------------------
> To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
> Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
>

-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners

Re: [Caml-list] reading bytes into c-defined structs

[art yerkes]

SWIG converts C structs into object like closures automatically.  These
objects support introspection, so it's easy to do things like iterating
the fields and the like.

There's also a camlp4 preprocessor which supports C++-like access to
object members.
-- 
Hey, Adam Smith, keep your invisible hands to yourself!

-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners