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Asked: 2026-05-11T06:52:17+00:00

With a COM interface method declared as this: [ object, uuid(….), ] interface IFoo

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With a COM interface method declared as this:

[ object,   uuid(....), ] interface IFoo : IUnknown  {   HRESULT Foo([in, out] CACLSID * items); }

With regards to marshalling, is the server allowed to reallocate the counted array? (I think it is, but I am not sure anymore)

Its current implementation only replaces the existing ID’s, but I’d like to implement a change (that would not break contract) that may return more items without introducing a new interface.

[edit] please note that CACLSID is already an array, containing a count and a pointer.

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1 Answer

  1. I have not done COM for a very long time but is it even possible to allocate a new array? In that case should it not be CACLSID ** items ?

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