What types should I use in this COM Interface

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Hi, I am having to write a COM wrapper dll to enable the use of a c++
library in a c# .net app, and have a few questions regarding what
types to use in the interface.

I used to program quite a bit of COM, but a couple of years of c# .net
has made me stupid.

Anyway, I need to pass (from c# to the com component) a HWND window
handle, and 2 strings. The function needs to deliver back to c# 2
lists or arrays of strings.

My guess at the moment is something like:
ULONG WindowHandle
BSTR FirstString
BSTR SecondString
VARIANT* FirstReturnedStringArray or List
VARIANT* SecondReturnedStringArray or List

and I probably need to return 2 ints indicating the length of the 2
lists right, or is there some type for representing a list of array of
strings that contains the count?

I am looking for whatever makes the most sense and requires the
minimal amount of mucking aroung with marshalling etc.

Thanks a lot
.

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