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GetAnycastIpAddressTable (Compact 7)

  • Article

3/12/2014

This function retrieves the anycast IP address table on the local device.

Syntax

NETIOAPI_API GetAnycastIpAddressTable(
  __in   ADDRESS_FAMILY  Family,
  __out  PMIB_ANYCASTIPADDRESS_TABLE* Table
);

Parameters

  • Family
    The address family to retrieve.

    Possible values for the address family are listed in the Winsock2.h header file. Note that the values for the AF_ address family and PF_ protocol family constants are identical (for example, AF_INET and PF_INET). Therefore, 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. Note 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 anycast IP address table that contains both IPv4 and IPv6 entries.

    AF_INET

    2

    The Internet Protocol version 4 (IPv4) address family. When this parameter is specified, this function returns the anycast IP address table that contains only IPv4 entries.

    AF_INET6

    23

    The Internet Protocol version 6 (IPv6) address family. When this parameter is specified, this function returns the anycast IP address table that contains only IPv6 entries.
  • Table
    A pointer to a MIB_ANYCASTIPADDRESS_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 on the local device and AF_INET was specified in the Family parameter. This error is also returned if no IPv6 stack is on the local device and AF_INET6 was specified in the Family parameter.

Other

Use FormatMessage to obtain the message string for the returned error.

Remarks

The GetAnycastIpAddressTable function enumerates the anycast IP addresses on a local system and returns this information in a MIB_ANYCASTIPADDRESS_TABLE structure.

The anycast IP address entries are returned in a MIB_ANYCASTIPADDRESS_TABLE structure in the buffer pointed to by the Table parameter. The MIB_ANYCASTIPADDRESS_TABLE structure contains an anycast IP address entry count and an array of MIB_ANYCASTIPADDRESS_ROW structures for each anycast 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.

Note that the returned MIB_ANYCASTIPADDRESS_TABLE structure pointed to by the Table parameter may contain padding for alignment between the NumEntries member and the first MIB_ANYCASTIPADDRESS_ROW array entry in the Table member of the MIB_ANYCASTIPADDRESS_TABLE structure. Padding for alignment may also be present between the MIB_ANYCASTIPADDRESS_ROW array entries. Any access to a MIB_ANYCASTIPADDRESS_ROW array entry should assume padding may exist.

See Also

Reference

IP Helper Functions
FreeMibTable
MIB_ANYCASTIPADDRESS_ROW
MIB_ANYCASTIPADDRESS_TABLE