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List:       ms-atl
Subject:    Re: OLEAUT32.DLL::DispCallFunc
From:       Tim Tabor <tltabor () EARTHLINK ! NET>
Date:       2000-07-31 16:35:03
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Hi Joe.

DispCallFunc is one level down from the documented
DispInvoke.  It appears to:

   Unpack prgpvarg
   Reorder the arguments and fix up and the stack as
      required by the parameter info and the calling
      convention.
   Jump to pvInstance
   Clean up the stack
   return

Here's a good rant about undocumented os api's
http://www.sni.net/~bediger/nt.sekrits.html

// tim

> -----Original Message-----
> From: ATL - Active Template Library [mailto:ATL@DISCUSS.MICROSOFT.COM]On
> Behalf Of Joe O'Leary
> Sent: Monday, July 31, 2000 11:36 AM
> To: ATL@DISCUSS.MICROSOFT.COM
> Subject: Re: OLEAUT32.DLL::DispCallFunc
>
>
> I have scoured the MSDN and the Net looking for documentation on this
> function but it does not appear to be documented anywhere.
>
> All I have found is that it is used by ATL's IDispEventSimpleImpl in the
> InvokeFromFuncInfo() member function (as you almost certainly knew
> already...).  I also found the following quotation in OLEAUTO.H
> right about
> the function prototype
>
>         "A low level helper for IDispatch::Invoke() provides
>          machine independence for customized Invoke"
>
>
> Joe O'
>
> p.s. Incidentally, DispCallFunc seems like a good candidate for anybody
> looking for ammo in the argument over MS making use of
> undocumented OS APIs
> in their products.  After all, ATL is a product and DispCallFunc is a part
> of an OS DLL...
>
> > -----Original Message-----
> > From: Richard Crossley [mailto:rdc@NTLWORLD.COM]
> > Sent: Friday, July 28, 2000 12:28 PM
> > To: ATL@DISCUSS.MICROSOFT.COM
> > Subject: OLEAUT32.DLL::DispCallFunc
> >
> >
> > Is the function DispCallFunc documented anywhere ?
> >
> > Richard Crossley
> > Design Engineer
> > Digitimer Limited
> > mailto:rcrossley@digitimer.com
> >
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