Re: [Vala] Vapi bindings and a weird C-pattern

[Felipe Lavratti <felipelav gmail com>]

Oh god, they use opaque handlers.

See the orientdb type as a context. You might abstract or hide it with a
static global. Careful with the initalization of statics in vala. I am not
experienced with vapis, but i believe you can instantiate a static field in
a class within it.


On Sat, May 14, 2016 at 20:57 Daniel Brendle <grindhold skarphed org> wrote:

> Hi, Guys
>
> I want to write VAPI bindings for liborient [0].
>
> While analyzing the C-code i came across the functions which turned out
> to work in a somewhat unexpected way.
> Usually one has some struct, methods to create and free the struct and a
> set of methods that operate on that struct. Such code can be converted
> to VAPI bindings in a straightforward way.
> However liborient keeps managing stuff like this:
>
>  - One struct to represent a handle
>  - One struct to represent a connection
>  - A set of methods which operate on _both_ of the previously mentioned
> structs.
>
> A typical method-definition looks like this:
>
> long o_bin_dataclustercount(orientdb *o, orientdb_con *c, struct timeval
> *timeout, int nonblocking, short clusternumber);
>
> In Vala I'd like to use the lib like this:
> var handle = new OrientDB();
> var connection = handle.connect("foo","bar");
> connection.dataclustercount(sometimeval, 1, 1);
>
> Under the given circumstances I have the feeling that the best thing one
> can achieve is something like this:
>
> var handle = new OrientDB();
> var connection = Connection.connect(handle, "foo", "bar")
> handle.dataclustercount(connection, sometimeval, 1, 1);
>
> Am I right? Is there any possibility to cover this C-Pattern?
>
> Second question: The library imports <sys/time.h> at some point and uses
> the timeval definition from in there in method signatures. How can i
> write equivalent Vala Types to write Vala signatures for them?
>
> Thanks in Advance and a nice evening,
>     grindhold
>
>
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