ADLINK Technology PCI-MPG24, Руководство пользователя

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DirectShow Programming 17
3.3.4 GetUnicastGroup / GetMulticastGroup
The GetUnicastGroup / GetMulticastGroup methods retrieve the
filters’ curent group address.
Syntax
HRESULT GetUnicastGroup(
ULONG* pIP,
USHORT* pPort
);
HRESULT GetMulticastGroup(
ULONG* pIP,
USHORT* pPort
);
Parameters
pIP
Pointer to a variable that retrieves the IP address in network order
(bytes ordered from left to right). You can use the inet_addr func-
tion to convert a standard dotted-format string (such as
“255.255.255.255”) to the correct binary number.
pPort
Pointer to a variable that retrieves the port number, in TCP/IP net-
work byte order. You can use the htons function to convert the port
number to the correct byte order.
Return values
Value Description
E_INVALIDARG Invalid IP address.
S_OK The method succeeded.