I don't see any problem here because the existing clients (which are
compiled and built into exe) would still continue to run without any
problem.
    The problem would only occur if you reopen the VB project which uses
this typelibrary in that case you may need to do changes in the VB code.

----- Original Message -----
From: "Simon Fell" <dcomZAKS.DEMON.CO.UK>
To: <DCOMDISCUSS.MICROSOFT.COM>
Sent: Saturday, May 19, 2001 2:22 PM
Subject: Versioning default interface's

Hi,

I have a component that i need to revise, I'm happy with all the rules
regarding interfaces, but can i change the default interface on the
coclass ?

e.g. i have
Interface IA : IUnknown {
};
Interface IB : IUnknown {
};
coclass A {
[default] interface IA ;
interface IB ;
};

can i change this to
Interface IA : IUnknown {
};
Interface IB : IUnknown {
};
Interface IC : IA {
};
coclass A {
[default] interface IC ;
interface IA ;
interface IB ;
};

or
Interface IA : IUnknown {
};
Interface IB : IUnknown {
};
Interface IC : IUnknown {
};
coclass A {
[default] interface IC ;
interface IA ;
interface IB ;
};

I think the first change is ok, but i can see that the second one
might break VB code (because a different interface is now mapped to
the classname by VB, ggrrrhhh )

Thanks
Simon

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