[Gambas-user] A "Callback" function doesn't work.

[Jussi Lahtinen]

Oops, what I was thinking... of course the allocation is inside of the
library, not in pointer declaration...
So I think that is correct.

Jussi


On Sun, Jul 14, 2013 at 5:41 PM, Jussi Lahtinen <jussi.lahtinen at ...626...>wrote:

> Not sure this is thread issue, and anyway if it's the problem I think
> jackd doesn't have to be ran as realtime thread (but
> maybe you need it that way?).
>
> I don't think these are equal: "Private client As Pointer" and
> "jack_client_t *client;".
>
> Gambas code "Something As Pointer" creates void pointer without any
> allocation,
> but C code "jack_client_t *client;" creates pointer and allocation for the
> structure.
>
> So you need to find out size of the structure and make the allocation in
> Gambas before using it.
> http://gambasdoc.org/help/lang/alloc
>
> Unless the library takes care of the allocation... not sure.
>
> Also you didn't mention how your code fails. I would expect SGN11.
>
> Jussi
>
>
>
>
> On Tue, Jul 9, 2013 at 4:45 PM, Ru Vuott <vuott at ...325...> wrote:
>
>> Thank you, Tobias.
>>
>> If it is just so, it's a pity.
>>
>> Regards
>> vuottt
>>
>>
>> --------------------------------------------
>> Lun 8/7/13, Tobias Boege <taboege at ...626...> ha scritto:
>>
>>  Oggetto: Re: [Gambas-user] A "Callback" function doesn't work.
>>  A: "mailing list for gambas users" <gambas-user at lists.sourceforge.net>
>>  Data: Lunedì 8 luglio 2013, 20:08
>>
>>  On Mon, 08 Jul 2013, Ru Vuott wrote:
>>  > Hello,
>>  >
>>  > I'm trying to transpose the short C code of the
>>  application: "simple_client" based on Jack API, which you
>>  can see here:
>>  >
>>  >
>> https://github.com/jackaudio/example-clients/blob/master/simple_client.c
>>  >
>>  > This small Jack application uses a function "callback"
>>  in the code called "process",  which I tried to call in
>>  Gambas adhering to the instructions - about the "callbacks"
>>  - contained in the official documentation relating to
>>  external functions.
>>  >
>>  > I do not understand really why the "backcall" function
>>  in my Gambas transposition does not works.
>>  > So I'ld like to ask for your help for a checking,
>>  so that we can understand the real problem.
>>  >
>>  > I attach the source code of my Gambas transposition.
>>  >
>>  > (Application needs Jack is running)
>>  >
>>  > Thanks... a lot !
>>
>>  Sorry, I don't know the least what this project is about but
>>  the comment in
>>  the C sources state that the callback is executed in a
>>  "special realtime
>>  thread". This is the same problem as here[0], I suspect.
>>
>>  Regards,
>>  Tobi
>>
>>  [0] http://sourceforge.net/mailarchive/message.php?msg_id=30895071
>>
>>
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