GetPerAdapterInfo

// IPHLPAPI.dll
#include <windows.h>

DWORD GetPerAdapterInfo(
    DWORD IfIndex,
    IP_PER_ADAPTER_INFO_W2KSP1* pPerAdapterInfo,   // optional
    DWORD* pOutBufLen
);

<DllImport("IPHLPAPI.dll", ExactSpelling:=True)>
Public Shared Function GetPerAdapterInfo(
    IfIndex As UInteger,   ' DWORD
    pPerAdapterInfo As IntPtr,   ' IP_PER_ADAPTER_INFO_W2KSP1* optional, out
    ByRef pOutBufLen As UInteger   ' DWORD* in/out
) As UInteger
End Function

' IfIndex : DWORD
' pPerAdapterInfo : IP_PER_ADAPTER_INFO_W2KSP1* optional, out
' pOutBufLen : DWORD* in/out
Declare PtrSafe Function GetPerAdapterInfo Lib "iphlpapi" ( _
    ByVal IfIndex As Long, _
    ByVal pPerAdapterInfo As LongPtr, _
    ByRef pOutBufLen As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetPerAdapterInfo = ctypes.windll.iphlpapi.GetPerAdapterInfo
GetPerAdapterInfo.restype = wintypes.DWORD
GetPerAdapterInfo.argtypes = [
    wintypes.DWORD,  # IfIndex : DWORD
    ctypes.c_void_p,  # pPerAdapterInfo : IP_PER_ADAPTER_INFO_W2KSP1* optional, out
    ctypes.POINTER(wintypes.DWORD),  # pOutBufLen : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
GetPerAdapterInfo = Fiddle::Function.new(
  lib['GetPerAdapterInfo'],
  [
    -Fiddle::TYPE_INT,  # IfIndex : DWORD
    Fiddle::TYPE_VOIDP,  # pPerAdapterInfo : IP_PER_ADAPTER_INFO_W2KSP1* optional, out
    Fiddle::TYPE_VOIDP,  # pOutBufLen : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "iphlpapi")]
extern "system" {
    fn GetPerAdapterInfo(
        IfIndex: u32,  // DWORD
        pPerAdapterInfo: *mut IP_PER_ADAPTER_INFO_W2KSP1,  // IP_PER_ADAPTER_INFO_W2KSP1* optional, out
        pOutBufLen: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("IPHLPAPI.dll")]
public static extern uint GetPerAdapterInfo(uint IfIndex, IntPtr pPerAdapterInfo, ref uint pOutBufLen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_GetPerAdapterInfo' -Namespace Win32 -PassThru
# $api::GetPerAdapterInfo(IfIndex, pPerAdapterInfo, pOutBufLen)

#uselib "IPHLPAPI.dll"
#func global GetPerAdapterInfo "GetPerAdapterInfo" sptr, sptr, sptr
; GetPerAdapterInfo IfIndex, varptr(pPerAdapterInfo), varptr(pOutBufLen)   ; 戻り値は stat
; IfIndex : DWORD -> "sptr"
; pPerAdapterInfo : IP_PER_ADAPTER_INFO_W2KSP1* optional, out -> "sptr"
; pOutBufLen : DWORD* in/out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "IPHLPAPI.dll"
#cfunc global GetPerAdapterInfo "GetPerAdapterInfo" int, var, var
; res = GetPerAdapterInfo(IfIndex, pPerAdapterInfo, pOutBufLen)
; IfIndex : DWORD -> "int"
; pPerAdapterInfo : IP_PER_ADAPTER_INFO_W2KSP1* optional, out -> "var"
; pOutBufLen : DWORD* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; DWORD GetPerAdapterInfo(DWORD IfIndex, IP_PER_ADAPTER_INFO_W2KSP1* pPerAdapterInfo, DWORD* pOutBufLen)
#uselib "IPHLPAPI.dll"
#cfunc global GetPerAdapterInfo "GetPerAdapterInfo" int, var, var
; res = GetPerAdapterInfo(IfIndex, pPerAdapterInfo, pOutBufLen)
; IfIndex : DWORD -> "int"
; pPerAdapterInfo : IP_PER_ADAPTER_INFO_W2KSP1* optional, out -> "var"
; pOutBufLen : DWORD* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	iphlpapi = windows.NewLazySystemDLL("IPHLPAPI.dll")
	procGetPerAdapterInfo = iphlpapi.NewProc("GetPerAdapterInfo")
)

// IfIndex (DWORD), pPerAdapterInfo (IP_PER_ADAPTER_INFO_W2KSP1* optional, out), pOutBufLen (DWORD* in/out)
r1, _, err := procGetPerAdapterInfo.Call(
	uintptr(IfIndex),
	uintptr(pPerAdapterInfo),
	uintptr(pOutBufLen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetPerAdapterInfo(
  IfIndex: DWORD;   // DWORD
  pPerAdapterInfo: Pointer;   // IP_PER_ADAPTER_INFO_W2KSP1* optional, out
  pOutBufLen: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'IPHLPAPI.dll' name 'GetPerAdapterInfo';

result := DllCall("IPHLPAPI\GetPerAdapterInfo"
    , "UInt", IfIndex   ; DWORD
    , "Ptr", pPerAdapterInfo   ; IP_PER_ADAPTER_INFO_W2KSP1* optional, out
    , "Ptr", pOutBufLen   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●GetPerAdapterInfo(IfIndex, pPerAdapterInfo, pOutBufLen) = DLL("IPHLPAPI.dll", "dword GetPerAdapterInfo(dword, void*, void*)")
# 呼び出し: GetPerAdapterInfo(IfIndex, pPerAdapterInfo, pOutBufLen)
# IfIndex : DWORD -> "dword"
# pPerAdapterInfo : IP_PER_ADAPTER_INFO_W2KSP1* optional, out -> "void*"
# pOutBufLen : DWORD* in/out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。