QueryInterface on IDispatch in Python ...

Roger Upole rupole at hotmail.com
Tue Oct 26 02:03:35 CEST 2004

You should be able to use Dispatch to get the desired interface,
something like this:
win32com.client.Dispatch(element, None, 

"Peter Sparago" <psparago at yahoo.com> wrote in message 
news:584da15e.0410241538.3830b170 at posting.google.com...
>I am working with the MSHTML editor control. I used
> win32com.client.gencache.EnsureModule on the MSHTML type library to
> generate the necessary IDispatch support for all the various
> interfaces used by MSHTML.
> I have just implemented some of the necessary custom COM
> interfaces/gateways to allow me to take control of MSHTML's
> right-click menu.
> One of the callbacks that MSHTML makes (and I've implemented) is
> 'ShowContextMenu' (on the IDocHostUIHandler interface). One of the
> arguments passed to ShowContextMenu is a generic IDispatch reference
> to the current HTML Element - ultimately this is an IHTMLElement
> interface reference.
> Python understands that this reference passed to 'ShowContextMenu' is
> an IDispatch interface but when I do a QueryInterface on this object
> to get the IHTMLElement interface (like so:)
> element = 
> dispElement.QueryInterface(IID('{3050F1FF-98B5-11CF-BB82-00AA00BDCE0B}'))
> I get the following error:
> exceptions.TypeError: {There is no interface object registered that
> supports this IID}
> What am I doing wrong? IHTMLElement *is* defined in the module .py
> file that was generated by EnsureModule from the type library,
> IHTMLElement is derived from IDispatch. Shouldn't I be able to make
> late-bound calls on the generic IDispatch reference?
> Any help would be greatly appreciated. 

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