|Microsoft DirectX 9.0|
The GetMulticastListSize method retrieves the number of addresses in the list.
HRESULT GetMulticastListSize( ULONG* pulcbAddresses );
[in, out] Pointer that receives the number of addresses multiplied by the size of an IPv4 address.
If the method succeeds, it returns S_OK. If it fails, it returns an error code.
This method is used by an IPv4 Network Data Sink filter to request that a Network Provider make its best effort to tune to the stream(s) on which a list of IPv4 multicast addresses may be transmitted. Addresses in the address list are byte-aligned in Network order. UlcbAddresses will always be an integer multiple of the size of an IPv4 address.