[Larceny-users] difficulty with callback

[Felix Klock]

David-

An error invocation in lib/Ffi/ffi-i386.sch says that the Callback abi has not been implemented for stdcall.

It would be nice to fix, but I do not know when I will be able to spend time on the problem.

(There are two separate implementation problems here: adding stdcall callback support in the low-level code, and extending the high-level surface syntax for callbacks using stdcall.  I think neither has been attacked.)

In the meantime, I have filed this as Ticket #660.

  https://trac.ccs.neu.edu/trac/larceny/ticket/660

-Felix

On Jan 26, 2010, at 1:53 PM, David Rush wrote:

> Hi there,
> 
> In working with this foreign function definition:
> 
> (define rtaudio-open-stream
>  (foreign-procedure "RTAWOpenStream"
>                     '(void*
>               ; DAC object
>                       (maybe void*)
>          ; output params
>                       (maybe void*)
>          ; input params
>                       int
>                ; audio format
>                       int
>                ; sample rate
>                       boxed
>             ; unsigned int* bufferFrames
>                       (-> (void* void* unsigned float int void*)
> void)  ; callback function needs to be stdcall
>                       (maybe void*)
>          ; user data context
>                       (maybe void*)
>          ; stream options
>                       )
>                     'int
>                     'cdecl))
> 
> I have encountered what appears t me to be an important question: How
> do I define the callback function's calling convention? I was just
> crawling through the underlying library code and it appears that it is
> expecting a stdcall callback under the cdecl API.
> 
> help?
> 
> david
> -- 
> GPG Public key at http://cyber-rush.org/drr/gpg-public-key.txt
> 
> _______________________________________________
> Larceny-users mailing list
> Larceny-users at lists.ccs.neu.edu
> https://lists.ccs.neu.edu/bin/listinfo/larceny-users