GetMulticastIpAddressTable (Compact 7)
3/12/2014
This function retrieves the multicast IP address table on the local device.
Syntax
NETIOAPI_API GetMulticastIpAddressTable(
__in ADDRESS_FAMILY Family,
__out PMIB_MULTICASTIPADDRESS_TABLE* Table
);
Parameters
Family
The address family to retrieve.Possible values for the address family are listed in the Winsock2.h header file. Be aware that the values for the AF_ address family and PF_ protocol family constants are identical (for example, AF_INET and PF_INET) so that either constant can be used.
The header file organization has changed and possible values for this member are defined in the Ws2def.h header file. Be aware that the Ws2def.h header file is automatically included in Winsock2.h, and should never be used directly.
The values currently supported are AF_INET, AF_INET6, and AF_UNSPEC:
Value Meaning AF_UNSPEC
0
The address family is unspecified. When this parameter is specified, this function returns the multicast IP address table that contains both IPv4 and IPv6 entries.
AF_INET
2
The IP version 4 (IPv4) address family. When this parameter is specified, this function returns the multicast IP address table that contains only IPv4 entries.
AF_INET6
23
The IP version 6 (IPv6) address family. When this parameter is specified, this function returns the multicast IP address table that contains only IPv6 entries.
- Table
A pointer to a MIB_MULTICASTIPADDRESS_TABLE structure that contains a table of anycast IP address entries on the local device.
Return Value
| Return code | Description |
|---|---|
NO_ERROR |
The function succeeds. |
ERROR_INVALID_PARAMETER |
An invalid parameter was passed to the function. This error is returned if a NULL pointer is passed in the Table parameter or the Family parameter was not specified as AF_INET, AF_INET6, or AF_UNSPEC. |
ERROR_NOT_ENOUGH_MEMORY |
Insufficient memory resources are available to complete the operation. |
ERROR_NOT_FOUND |
No anycast IP address entries as specified in the Family parameter were found. |
ERROR_NOT_SUPPORTED |
The request is not supported. This error is returned if no IPv4 stack is located on the local device and AF_INET was specified in the Family parameter. This error is also returned if no IPv6 stack is located on the local device and AF_INET6 was specified in the Family parameter. This error is also returned on versions of Windows where this function is not supported. |
Other |
Use FormatMessage to obtain the message string for the returned error. |
Remarks
The GetMulticastIpAddressTable function enumerates the multicast IP addresses on a local system and returns this information in a MIB_MULTICASTIPADDRESS_TABLE structure.
The multicast IP address entries are returned in a MIB_MULTICASTIPADDRESS_TABLE structure in the buffer pointed to by the Table parameter. The MIB_MULTICASTIPADDRESS_TABLE structure contains a multicast IP address entry count and an array of MIB_MULTICASTIPADDRESS_ROW structures for each multicast IP address entry. When these returned structures are no longer required, free the memory by calling the FreeMibTable.
The Family parameter must be initialized to either AF_INET, AF_INET6, or AF_UNSPEC.
Be aware that the returned MIB_MULTICASTIPADDRESS_TABLE structure pointed to by the Table parameter can contain padding for alignment between the NumEntries member and the first MIB_MULTICASTIPADDRESS_ROW array entry in the Table member of the MIB_MULTICASTIPADDRESS_TABLE structure. Padding for alignment can also be present between the MIB_MULTICASTIPADDRESS_ROW array entries. Any access to a MIB_MULTICASTIPADDRESS_ROW array entry should assume padding can exist.
See Also
Reference
IP Helper Functions
FreeMibTable
GetMulticastIpAddressEntry
MIB_MULTICASTIPADDRESS_ROW
MIB_MULTICASTIPADDRESS_TABLE