Unmanaged/managed interop - trouble passing int[]?

BOOL in C++ is actually an "int" so make sure you use System. Int32 and not System.Boolean. Alternatively it might be using COM data types i.e.

VARIANT_BOOL, in which case you need do need System.Boolean. Have you tried running dependency viewer to confirm the function prototype?

Have you tried specifying the MarshalAs attribute, e.g.

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