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

[Ru Vuott]

Ops.... thank you very much Jussi !

I had not paid proper attention to the guide !

Well, it says a "Pointer". I had assumed, but I was not sure.

Thanks.

vuott



--------------------------------------------
Ven 5/7/13, Jussi Lahtinen <jussi.lahtinen at ...626...> ha scritto:

 Oggetto: Re: [Gambas-user] Calling a internal function from parametres of external _callback function
 A: "mailing list for gambas users" <gambas-user at lists.sourceforge.net>
 Cc: "Benoit" <gambas at ...1...>
 Data: Venerdì 5 luglio 2013, 20:54
 
 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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