Re: connection point event is not fire from com component

From:

"Igor Tandetnik" <itandetnik@mvps.org>

Newsgroups:

microsoft.public.vc.atl

Date:

Wed, 20 Sep 2006 22:22:10 -0400

Message-ID:

<Of6ZnSS3GHA.324@TK2MSFTNGP05.phx.gbl>

"Jenny" <jean.shu@gmail.com> wrote in message
news:1158804713.783330.70700@h48g2000cwc.googlegroups.com

//client code
class CTstConnect :
public IDispatchImpl<IExtractEvent, &IID_IExtractEvent,
&CLSID_ScribbleExtractor>,

This does not look right. First, IDispatchImpl only support dual
interfaces. An event interface should never be a dual interface, most
often it's a dispinterface. Use IDispEventImpl to implement event sink.
See ATLEventHandling sample.

Second, the third template parameter of IDispatchImpl is a LIBID, not a
CLSID.

[
uuid(673B02F2-97D8-4b1f-9482-088C017E418E),
version(1.0),
helpstring("ConnectDemo 1.0 Type Library")
]
interface IExtractEvent : IDispatch
{
[helpstring("method OnExtractImage")] HRESULT OnExtractImage();
};

Don't make an outgoing interface dual. Make it a dispinterface.
--
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