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Multiple IDispatch interfaces

Posted on 1997-07-31
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Last Modified: 2013-11-20
Is it okay to create an ActiveX component which implements multiple interfaces derived from IDispatch.
If such a component is created can it be used in a Visual Basic application
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Question by:santoshu
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faster earned 0 total points
ID: 1302964
You can, however, what pointer are you going to return when there is a request for IDispatch?  VB will not know there are other interfaces in your control.  Of course, through vtable binding, it is still possible.
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by:santoshu
ID: 1302965
<<Of course, through vtable binding, it is still possible. >>

Is it possible to use from VB or just from a C++ container ?
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by:faster
ID: 1302966
From VB, Yes.  From container, I am not sure, probably can.  But I don't think it is a good idea to do it in this way.  You can implement several controls and combine them in one ocx (dll) file.
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by:santoshu
ID: 1302967
I though VB is an interpreted environment and would not be able to make calls to functions present in  the Vtable. For making OLE calls it would get the IDispatch interface and make the calls with the proper dispid. I don't know how it can resolve a function call to a method which has same name in two interfaces derived from IDispatch.

Can any one please shed more light on this.

Thanks

Santosh
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Author Comment

by:santoshu
ID: 1302968
I thought VB is an interpreted environment and would not be able to make calls to functions present in  the Vtable. For making OLE calls it would get the IDispatch interface and make the calls with the proper dispid. I don't know how it can resolve a function call to a method which has same name in two interfaces derived from IDispatch.

Can any one please shed more light on this.

Thanks

Santosh
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