Re: SINK_ENTRY gives -- cannot convert from '_atl_event_classtype *'

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Sun, 3 Feb 2008 19:50:51 -0500

Message-ID:

<#IS8$fsZIHA.4196@TK2MSFTNGP04.phx.gbl>

"Gerry Suggitt" <GerrySuggitt@discussions.microsoft.com> wrote in
message news:615E2D12-99F3-4E4F-BA7A-7801C493E336@microsoft.com

error C2440: 'static_cast' : cannot convert from
'_atl_event_classtype *' to 'ATL::_IDispEventLocator<nID,piid> *'

Here is the complete code:

#include "stdafx.h"
#import "c:\\windows\\system32\\macromed\\flash\\flash9e.ocx"
rename_namespace("FLASH")

class ATL_NO_VTABLE XXX :
   public IDispEventImpl< 0,
                          XXX,
                          &__uuidof(FLASH::_IShockwaveFlashEvents),
                          &__uuidof(FLASH::__ShockwaveFlashObjects) >
{
public:
   BEGIN_SINK_MAP(XXX)
       SINK_ENTRY( 0, 0xc5, &XXX::onFlashCall )
   END_SINK_MAP()

SINK_ENTRY only works when you leave all but the first two parameters of
IDispEventImpl at their default values. Since you explicitly specified
the IID of the sink interface in IDispEventImpl, you now need to
explicitly specify it in sink map too, using SINK_ENTRY_EX macro.
--
With best wishes,
Igor Tandetnik

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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