GetUnicastIpAddressTable (Compact 7)
3/12/2014
This function retrieves the unicast IP address table on the local device.
Syntax
NETIOAPI_API GetUnicastIpAddressTable(
__in ADDRESS_FAMILY Family,
__out PMIB_UNICASTIPADDRESS_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). Therefore, either constant can be used.
The header files 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 unicast 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 unicast 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 unicast IP address table that contains only IPv6 entries.
- Table
A pointer to a MIB_UNICASTIPADDRESS_TABLE structure that contains a table of unicast 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 unicast 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 GetUnicastIpAddressTable function enumerates the unicast IP addresses on a local system and returns this information in an MIB_UNICASTIPADDRESS_TABLE structure.
The unicast IP address entries are returned in a MIB_UNICASTIPADDRESS_TABLE structure in the buffer pointed to by the Table parameter. The MIB_UNICASTIPADDRESS_TABLE structure contains a unicast IP address entry count and an array of MIB_UNICASTIPADDRESS_ROW structures for each unicast 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_UNICASTIPADDRESS_TABLE structure pointed to by the Table parameter can contain padding for alignment between the NumEntries member and the first MIB_UNICASTIPADDRESS_ROW array entry in the Table member of the MIB_UNICASTIPADDRESS_TABLE structure. Padding for alignment can also be present between the MIB_UNICASTIPADDRESS_ROW array entries. Any access to a MIB_UNICASTIPADDRESS_ROW array entry should assume padding can exist.
See Also
Reference
IP Helper Functions
CreateUnicastIpAddressEntry
DeleteUnicastIpAddressEntry
FreeMibTable
GetUnicastIpAddressEntry
InitializeUnicastIpAddressEntry
MIB_UNICASTIPADDRESS_ROW
MIB_UNICASTIPADDRESS_TABLE
NotifyStableUnicastIpAddressTable
NotifyUnicastIpAddressChange
SetUnicastIpAddressEntry