[Gambas-user] Calling a internal function from parametres of external _callback function

[Jussi Lahtinen]

http://gambasdoc.org/help/lang/extdecl?v3

Jussi


On Fri, Jul 5, 2013 at 6:20 PM, Ru Vuott <vuott at ...325...> wrote:

> Hello,
>
> Wanting to use the Jack API, and studying examples written in C, I meet
> some external "callback" functions that within their parameters have the
> reference to another function (this internal to the code).
>
> Here an exemple of those external Jack API "callback" functions:
>
>        jack_set_process_callback(client, process_callback, 0);
>
> This function tells the Jack server to call process_callback whenever
> there is work be done, passing arg as the second argument.
>
> Well, I'ld like to use this particular functions, but I do not know how I
> *have to declare* them when I use Extern:
>
>      Private Extern  jack_set_process_callback(Pclient As Pointer,
> ...???.... As ....???..., Intarg As Integer)
>
> In fact something like  "....As Function" is not possible.
>
>
> Suggestions ?
>
> Regards
> vuottt
>
>
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