Re: Can't add property getter for write-only property in derived interface

"Igor Tandetnik" <>
Mon, 25 Jun 2007 07:57:48 -0400
<> wrote in message

We've released a component which has a dual interface with some write-
only properties (this was actually a mistake, but we have to live with
it now). We're trying to add a "propget" for each of those properties
in a derived interface, but we're getting the following MIDL error
(interface name changed to protect the guilty):

midl\oleaut32.dll : error MIDL2020 : error generating type library :
LayOut failed : IMyInterface2 (0x800288C6)

Yes, MIDL doesn't support such a split property. Or rather, the OS code
that builds and parses TLBs doesn't support it.

If this just isn't possible, our fallback position is to make
IMyInterface2 a completely new interface, derived from IDispatch, but
then clients lose the ability to (for example) pass an IMyInterface2*
to a function expecting an IMyInterface*.

You would also need a custom IDispatch implementation that would support
the functionality of both interfaces.
With best wishes,
    Igor Tandetnik

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