problems marshaling arbitrary sized arrays of structs

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trying to send back an arbitrary sized array of data from one exe to
another, but only the first item is copied.

here's the idl for the method

HRESULT GetBananas([out] DWORD *numBananas, [out, size_is(,*numTags)]
Banana** bananas);

struct Banana
{
DWORD length;
BSTR favoriteName;
};

In GetBananas I allocate the required memory with CoTaskMemAlloc (or
CoTaskMemRealloc).
Only the first item gets copied, the rest of the items in bananas array
are just garbled stuff...

I assume my IDL declaration is wrong, what's up with it ?

p.s. - just for testing I tried to change the Banana to a DWORD, hence
sending back an array of DWORDs, got the same results, only first item
has meaningful data...

.

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