GetPerAdapterInfo function (iphlpapi.h)

Article
02/22/2024

The GetPerAdapterInfo function retrieves information about the adapter corresponding to the specified interface.

Syntax

IPHLPAPI_DLL_LINKAGE DWORD GetPerAdapterInfo(
  [in]  ULONG                IfIndex,
  [out] PIP_PER_ADAPTER_INFO pPerAdapterInfo,
  [in]  PULONG               pOutBufLen
);

Parameters

[in] IfIndex

Index of an interface. The GetPerAdapterInfo function retrieves information for the adapter corresponding to this interface.

[out] pPerAdapterInfo

Pointer to an IP_PER_ADAPTER_INFO structure that receives information about the adapter.

[in] pOutBufLen

Pointer to a ULONG variable that specifies the size of the IP_PER_ADAPTER_INFO structure. If this size is insufficient to hold the information, GetPerAdapterInfo fills in this variable with the required size, and returns an error code of ERROR_BUFFER_OVERFLOW.

Return value

If the function succeeds, the return value is ERROR_SUCCESS.

If the function fails, the return value is one of the following error codes.

Return code	Description
ERROR_BUFFER_OVERFLOW	The buffer size indicated by the pOutBufLen parameter is too small to hold the adapter information. The pOutBufLen parameter points to the required size.
ERROR_INVALID_PARAMETER	The pOutBufLen parameter is NULL, or the calling process does not have read/write access to the memory pointed to by pOutBufLen, or the calling process does not have write access to the memory pointed to by the pAdapterInfo parameter.
ERROR_NOT_SUPPORTED	GetPerAdapterInfo is not supported by the operating system running on the local computer.
Other	If the function fails, use FormatMessage to obtain the message string for the returned error.

Remarks

An adapter index may change when the adapter is disabled and then enabled, or under other circumstances, and should not be considered persistent.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps \| UWP apps]
Minimum supported server	Windows 2000 Server [desktop apps \| UWP apps]
Target Platform	Windows
Header	iphlpapi.h
Library	Iphlpapi.lib
DLL	Iphlpapi.dll