|Microsoft DirectX 9.0|
The GetMulticastListSize method retrieves the number of addresses currently in the list.
HRESULT GetMulticastListSize( ULONG* pulcbAddresses );
[out] Pointer that receives the number of addresses currently in the Network Provider's list.
If the method succeeds, it returns S_OK. If it fails, it returns an error code.
Addresses in the address list are byte aligned in Network order. UlcbAddresses will always be an integer multiple of the size of an Ethernet address.