Re: can event handler call event source passed as connection point parameter?

From:
"Xudong" <chenxudongsg@gmail.com>
Newsgroups:
microsoft.public.vc.atl
Date:
29 Sep 2006 01:57:48 -0700
Message-ID:
<1159520268.297967.79230@i42g2000cwa.googlegroups.com>
Here they are:

[ object, uuid(...), dual, nonextensible, pointer_default(unique) ]
interface IServer : IDispatch
{
    [id(11)] HRESULT SomeMethod();
};

In library section:

[ uuid(...) ]
dispinterface _IServerEvents
{
     methods:
          [id(3)] void OnSomeEvent([in] IServer * ptr, [in] long
param);
};

[ uuid(...), noncreatable ]
coclass Server
{
    [default] interface IServer;
    [default, source] dispinterface _IServerEvents;
};

Thanks a lot.

Igor Tandetnik wrote:

Xudong <chenxudongsg@gmail.com> wrote:

What's weird here is that if I do a redundant QueryInterface on the
pointer for its own type, the code runs normal! The code is similar to
following:

// event source in free threaded DLL
class CServer ... {
   Fire_OnSomeEvent(IServer* ptr) { // ATL generated
       ...
       HRESULT hr = Invoke(...);
       ...
   }

   SomeMethod() {}
};

// event handler in apartment threaded EXE
class CClient ... {
   void __stdcall OnSomeEvent(IServer * ptr) {
       ptr->QueryInterface(IID_IServer, (void**)&ptr); // line X
       ptr->SomeMethod(): // line Y
   }
};

With line X, everything works fine and line Y does call through
SomeMethod().


Show the definition of IServer. What kind of interface is it - dual,
automation, custom? Show the definition of OnSomeEvent: what type
parameter is it declared to have?
--
With best wishes,
    Igor Tandetnik

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