lablgtk2: receiving messages from network?

lablgtk2: receiving messages from network?

[Ivan Matveich]

Dear ocaml users,

I'm writing a gtk program that must receive data through a tcp
connection and react to it immediately.

What's the best way to implement this?
Can gtk call me back when data is available on a socket?
How do I use Marshal without blocking?

Thank you.

Re: [Caml-list] lablgtk2: receiving messages from network?

[yoann padioleau]

On 15 avr. 06, at 21:33, Ivan Matveich wrote:

> Dear ocaml users,
>
> I'm writing a gtk program that must receive data through a tcp
> connection and react to it immediately.
>
> What's the best way to implement this?
> Can gtk call me back when data is available on a socket?
> How do I use Marshal without blocking?

I think that threads can be used for that kind of problem.
Welcome to the world of concurrency ...


>
> Thank you.
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Re: [Caml-list] lablgtk2: receiving messages from network?

[Markus Mottl]

On 4/15/06, Ivan Matveich <ivan.matveich@gmail.com> wrote:
> How do I use Marshal without blocking?

You can set the socket options Unix.SO_RCVTIMEO and Unix.SO_SNDTIMEO
using Unix.setsockopt_float, passing the number of seconds until
timeout as argument.

Regards,
Markus

--
Markus Mottl        http://www.ocaml.info        markus.mottl@gmail.com

Re: [Caml-list] lablgtk2: receiving messages from network?

[Eric Cooper]

On Sat, Apr 15, 2006 at 03:33:36PM -0400, Ivan Matveich wrote:
> I'm writing a gtk program that must receive data through a tcp
> connection and react to it immediately.
> 
> What's the best way to implement this?
> Can gtk call me back when data is available on a socket?
> How do I use Marshal without blocking?

You can use the Glib.IO interface to create a glib io_channel from
your TCP socket, and then use add_watch to associate a callback with
it.  Your socket will then be polled as part of the Glib main event loop.

-- 
Eric Cooper             e c c @ c m u . e d u

Re: [Caml-list] lablgtk2: receiving messages from network?

[Remi Vanicat]

2006/4/15, Ivan Matveich <ivan.matveich@gmail.com>:
> Dear ocaml users,
>
> I'm writing a gtk program that must receive data through a tcp
> connection and react to it immediately.

As someone already tell you, you could use the Glib.IO interface.
There is also equeue of Gerd Stolpman that is integrated with the Gtk
main loop, see
http://www.ocaml-programming.de/programming/equeue.html

(Sory for sending you this twice, the first time I forget to send it
on the list).

Re: [Caml-list] lablgtk2: receiving messages from network?

[Ivan Matveich]

Thanks, module Glib.Io is what I needed.

Now I have another question. I've started writing some code,

module Channel =
  struct
    type event =
      | Connected of Unix.sockaddr
      | Dropped of Unix.sockaddr
      | Received of Unix.sockaddr * x
      | Sent of Unix.sockaddr * x
    type action =
      | Associate of Unix.sockaddr
      | Dissociate of Unix.sockaddr
      | Send of Unix.sockaddr * x

where x will be something returned by Marshal.from_string.

How do I properly specify its type?

Re: [Caml-list] lablgtk2: receiving messages from network?

[Jacques Garrigue]

From: "Ivan Matveich" <ivan.matveich@gmail.com>

> Now I have another question. I've started writing some code,
> 
> module Channel =
>   struct
>     type event =
>       | Connected of Unix.sockaddr
>       | Dropped of Unix.sockaddr
>       | Received of Unix.sockaddr * x
>       | Sent of Unix.sockaddr * x
>     type action =
>       | Associate of Unix.sockaddr
>       | Dissociate of Unix.sockaddr
>       | Send of Unix.sockaddr * x
> 
> where x will be something returned by Marshal.from_string.
> 
> How do I properly specify its type?

I suppose x should be Obj.t, meaning that you're going to use Obj.repr
and Obj.obj. This is clearly unsafe, but any use of Marshal is.

Jacques Garrigue