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Alex
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 Posted: Wed Sep 01, 2004 7:01 pm Post subject: Returning an interface through an activex object |
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I have created an interface, that returns a data structure instead of
scalar values.
Since one cannot return user defined structures through an ActiveX
interface, I created a second interface, that takes the data.
Then, in the method that should return the interface, I created an
instance via the IDispatch interface. It looks something like this:
In the class declaration:
....
private:
IMyOleComponentDisp Server;
....
in my method
....
Server.BindDefault();
Server.MyfunctionThatPassesDataToServer(MyData);
Now I have a working Dispatch interface, but how can I pass it as a return
value to the function? The function can only have a parameter of type
IMyOleComponent**, so I cannot return the dispatch interface directly.
What's the solution to this, or am I doing it completely wrong.
Thanks,
Alex
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Remy Lebeau (TeamB)
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| Posted: Wed Sep 01, 2004 7:36 pm Post subject: Re: Returning an interface through an activex object |
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"Alex" <mycroft_5 (AT) hotmail (DOT) com> wrote
| Quote: | Now I have a working Dispatch interface, but how can I pass it
as a return value to the function? The function can only have a
parameter of type IMyOleComponent**, so I cannot return the
dispatch interface directly.
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Yes, you can. That is exactly what such methods do. For example:
HRESULT __stdcall TMyActiveXImpl::GetTheInterface(IMyData** Result)
{
IMyData *pInst = NULL;
// instantiate pInst as needed...
*Result = pInst;
pInst->AddRef();
return S_OK;
}
Then you call it like this:
IMyActiveX* pInst = NULL;
// instantiate pInst as needed...
IMyData* pData = NULL;
pInst->GetTheInterface(&pData);
// use pData as needed...
pData->Release();
//...
pInst->Release();
Gambit
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Alex
Guest
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| Posted: Thu Sep 02, 2004 5:49 pm Post subject: Re: Returning an interface through an activex object |
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On Wed, 01 Sep 2004 12:36:28 -0700, Remy Lebeau (TeamB) wrote:
| Quote: | Yes, you can. That is exactly what such methods do. For example:
[...] |
Now it works. Thank you!
regards,
Alex
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