Re: [rt.cpan.org #53914] Bug report for Win32::API::Callback

Tue Sep 07 17:30:54 2010: Request 53914 was acted upon.
Transaction: Correspondence added by [email protected]
       Queue: Win32-API
     Subject: Re: [rt.cpan.org #53914] Bug report for Win32::API::Callback
   Broken in: (no value)
    Severity: (no value)
       Owner: Nobody
  Requestors: [email protected]
      Status: open
 Ticket <URL: https://rt.cpan.org/Ticket/Display.html?id=53914 >


On 9/7/2010 4:51 AM, Aldo Calpini via RT wrote:
> Tue Sep 07 07:51:32 2010: Request 53914 was acted upon.
> Transaction: Correspondence added by ACALPINI
>         Queue: Win32-API
>       Subject: Bug report for Win32::API::Callback
>     Broken in: (no value)
>      Severity: (no value)
>         Owner: Nobody
>    Requestors: [email protected]
>        Status: open
>   Ticket<URL: https://rt.cpan.org/Ticket/Display.html?id=53914>
>
>
> my (wild enough) guess is that there is something different in the
> PHANDLER_ROUTINE (the callback SetConsoleCtrlHandler expects) from other
> working callbacks. Namely:
>
> BOOL WINAPI HandlerRoutine(
>    __in  DWORD dwCtrlType
> );
>
> versus e.g.:
>
> BOOL CALLBACK EnumWindowsProc(
>    __in  HWND hwnd,
>    __in  LPARAM lParam
> );
>
> the difference is the WINAPI instead of CALLBACK definition. I think it
> may have something to do with calling conventions and how parameters are
> pushed to the stack.
>
> this would man that callbacks defined in C as WINAPI are not supported,
> only those defined as CALLBACK are.
>
> but digging in the C headers to find the real difference between WINAPI
> and CALLBACK, or even adding support for different calling conventions
> in Win32::API::Callback is beyond my scope at the moment, sorry :-(

They appear to be the esentially the same.
Looks like it's just a matter of whether __stdcall calling convention
is in use or not.

WINDEF.H:

#if (_MSC_VER >= 800) || defined(_STDCALL_SUPPORTED)
#define CALLBACK    __stdcall
#define WINAPI      __stdcall
#define WINAPIV     __cdecl
#define APIENTRY    WINAPI
#define APIPRIVATE  __stdcall
#define PASCAL      __stdcall
#else
#define CALLBACK
#define WINAPI
#define WINAPIV
#define APIENTRY    WINAPI
#define APIPRIVATE
#define PASCAL      pascal
#endif