Re: IViewObject:Draw

From:
"Igor Tandetnik" <itandetnik@mvps.org>
Newsgroups:
microsoft.public.vc.language
Date:
Mon, 9 Feb 2009 19:57:47 -0500
Message-ID:
<Oq$7XqxiJHA.504@TK2MSFTNGP06.phx.gbl>
Fede <federico.sucari@gmail.com> wrote:

It is my first post in this group and I would appreciate some help in
making IViewObject:Draw / IWebbrowser2 / IHTMLDocument2 interfaces.
The moment I call the IViewObject:Draw interface it returns E_FAIL. I
am working in plain C and COM (no ATL/MFC/etc.).

In a nutshell, this is the code:

IWebBrowser2* pWBApp = NULL;
CoInitialize(NULL);
CoCreateInstance(CLSID_InternetExplorer,
           NULL,
           CLSCTX_SERVER,
           IID_IWebBrowserApp,
           (LPVOID*)&pWBApp);


You are creating a standalone instance of Internet Explorer, in a
separate process. IViewObject is not marshallable, it doesn't work
across a process boundary. What you are trying to do has any hope of
working only if you host an instance of WebBrowser control in-process.

In addition, you are requesting IWebBrowserApp pointer, but storing it
in a IWebBrowser2* variable. This is an illegal downcast. The IID and
the variable type have to match.
--
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
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