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From: Funnyman on 19 Jun 2008 18:30
On Jun 9, 6:50 pm, Norman Bullen <n...(a)BlackKittenAssociates.com>
wrote:
> Funnyman wrote:
> > I've been trying to find an answer to this question for a few days
> > (through research and experimentation), but haven't had any success,
> > so I figured I'd try this group.
>
> > All scenarios are running on Windows NT 4.0, apps compiled using
> > Visual Studio 6.0.
>
> > Basically I want to know if aneventobject created by aserver
> > application (application A) can be passed to a VB script file via a
> > COM API return parameter, then passed to anotherserverapplication
> > (application B) as a parameter using one of B's COM API functions,
> > then application B will use WaitForSingleObject on thateventobject
> > to wait for it to be signaled by application A.
>
> > To clarify a bit, here are the function definitions I mentioned above:
>
> > Application A:
> >   STDMETHOD(GetPageVectorEntryBreakEvent)(/*[in]*/long
> > lZeroBasedIndex, /*[out,retval]*/long *plBreakEvent);
>
> > Application B:
> >   STDMETHOD(Page)(/*[in]*/ DWORD zoneNumber, /*[in]*/ BSTR wavefile, /
> > *[in,optional]*/ long lBreakEvent);
>
> > VB script snippet that uses the functions:
> >    ...
> >    lngPageBreakEvent = AppA.GetPageVectorEntryBreakEvent(lngIndex)
> >    AppB.Page lngZoneNumber, "C:\program files\crq\prompts\7050.wav",
> > lngPageBreakEvent
>
> > The intended functionality is that when AppB.Page is called,
> > application B starts playing a .wav file that will play until
> > completed OR until the lngPageBreakEvent is set using SetEvent in
> > application A. I'm finding that setting theeventin application A has
> > no effect on application B.
>
> > I can provide some nitty gritty implementation details if they'll help
> > reach a solution, but for now I just wanted to see if anyone has had
> > experience in making this work. But essentially theeventobject
> > handle is going through the following transformation
> >   HANDLE -> long -> (void *) -> HANDLE
>
> > Thanks in advance for any help you can provide me, as this problem has
> > been bugging me non-stop and I'd like to put it behind me.
>
> > Cheers,
> > Mike (Funnyman)
>
> Eventobjectscan be named. Yourtwoapplicationscanshareaneventif
> they both call CreateEvent() using the same name.
>
> It sounds like you're trying to pass a handle from one application to
> another via a third; this can be done but it's probably more difficult.
> You need to use DuplicateHandle() to create a handle that the receiving
> application can use and then pass the numeric value of that handle to it.
>
> --
> Norm
>
> To reply, change domain to an adult feline.

Thank you so much for your response - I ended up using the
DuplicateHandle() function because I wasn't able to work out how to
communicate the named events between the two applications in a dynamic
manner. The functionality now works perfectly!

Thanks again,
Mike
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