Re: determining when a ActiveX control is being used by a designer

"Alexander Nickolov" <>
Wed, 9 Jan 2008 09:28:06 -0800
More precisely one does QI for IDispatch on any site pointer,
both IOleClientSite and IOleControlSite will do, heck, even
IUnknown will do... (Also note there's no standard IClientSite
interface used by ActiveX Controls.) The IDispatch implemented
on the site object is called ambient dispatch and is the only
documented way for ActiveX Controls to obtain ambient
properties from the container. Only the Invoke method is
required to be implemented.

Alexander Nickolov
Microsoft MVP [VC], MCSD

"Brian Muth" <> wrote in message

you said...

Lets pretent for just a moment that my ActiveX control isn't developed
with a Microsoft framework. How would one go about getting the user
mode? I get the impression that if one where to get the IClientSite
interface from the client and then call it's IDispatch::Invoke() of
DISPID_AMBIENT_USERMODE, one would get the answer, correct? Is there
an actual interface so that one does not have to mess with

You have the right idea, although IIRC it is the IOleClientSite that is
most readily available. Then you simply fetch the property using
IDispatch::Invoke(). There is no special interface devoted to just ambient
properties, AFAIK.


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