Re: Problem with SAFEARRAY as property accessors.

From: Igor Tandetnik (itandetnik_at_mvps.org)
Date: 03/25/05 

Date: Fri, 25 Mar 2005 10:11:17 -0500

"Ahmad Jalil Qarshi" <ahmaddearNO@SPAMhotmail.com> wrote in message
news:ursMToTMFHA.508@TK2MSFTNGP12.phx.gbl
> error C2259: 'CComObject<class CTestLoadObj>' : cannot instantiate
> abstract class due to following members:
> c:\program files\microsoft visual
> studio\vc98\atl\include\atlcom.h(1823) : while compiling
> class-template member function 'long __stdcall ATL::CComCreator<class
> ATL::CComObject<class CTestLoadObj> >::CreateInstance(void *,const
> struct _GUID &,void ** )'
>
> could you plz tell me how to define these properties in .cpp file
> also.
> i suppose that it would be like that:
> STDMETHODIMP CTestLoadObj::get_Data(SAFEARRAY *pVal)
> {
> }
> STDMETHODIMP CTestLoadObj::put_Data(SAFEARRAY pVal)
> {
> }

A SAFEARRAY(Whatever) parameter in IDL becomes SAFEARRAY* in C++.
SAFEARRAY(Whatever)* becomes SAFEARRAY**, and so on. In other words, in
C++ you always specify one extra level of indirection compared to IDL
syntax. 

-- 
With best wishes,
    Igor Tandetnik
With sufficient thrust, pigs fly just fine. However, this is not 
necessarily a good idea. It is hard to be sure where they are going to 
land, and it could be dangerous sitting under them as they fly 
overhead. -- RFC 1925

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