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Article View: borland.public.cppbuilder.nativeapi
Article #9471

Re: Callback function as method class

#9471
From: Sam
Date: Fri, 09 Jul 2004 08:56
32 lines
2027 bytes
Okey !
But if I use the satic keyword for this function like this:
static LRESULT CALLBACK NewWindowProc(HWND hWnd, UINT msg, WPARAM w, LPARAM
l)

The compiler refused with this error in french:
E2092 La classe de stockage 'classe de stockage' n'est pas autoris�e ici
Translate:
E2092 the class of storage 'stockage class' is not authorized here
Why ?

Sam

"Eelke Klein" <e.klein@mplussoftware.nl> a �crit dans le message de
news:40ee47c8$1@newsgroups.borland.com...
> Sam wrote:
> > I need to drop this callback function as a method of a custom C++ class:
> > LRESULT CALLBACK NewWindowProc(HWND hWnd, UINT msg, WPARAM w, LPARAM l)
> >     {
> >         ...
> >         return CallWindowProc(OldProc, hWnd, msg, w, l);
> >     }
> > The compiler refused. It seems that a class can't has a callback as
method,
> > that is right ?
> Yes
>
> Windows callback functions should be normal functions or static member
> functions. Normal member functions won't work because they have an
> additional hidden parameter which is the object on which they are called.
>
> Eelke
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Subject: Re: Callback function as method class
Date: Fri, 9 Jul 2004 10:56:11 +0200
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