GetInterfaceInfo

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

DWORD GetInterfaceInfo(
    IP_INTERFACE_INFO* pIfTable,   // optional
    DWORD* dwOutBufLen
);

<DllImport("IPHLPAPI.dll", ExactSpelling:=True)>
Public Shared Function GetInterfaceInfo(
    pIfTable As IntPtr,   ' IP_INTERFACE_INFO* optional, out
    ByRef dwOutBufLen As UInteger   ' DWORD* in/out
) As UInteger
End Function

' pIfTable : IP_INTERFACE_INFO* optional, out
' dwOutBufLen : DWORD* in/out
Declare PtrSafe Function GetInterfaceInfo Lib "iphlpapi" ( _
    ByVal pIfTable As LongPtr, _
    ByRef dwOutBufLen 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

GetInterfaceInfo = ctypes.windll.iphlpapi.GetInterfaceInfo
GetInterfaceInfo.restype = wintypes.DWORD
GetInterfaceInfo.argtypes = [
    ctypes.c_void_p,  # pIfTable : IP_INTERFACE_INFO* optional, out
    ctypes.POINTER(wintypes.DWORD),  # dwOutBufLen : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
GetInterfaceInfo = Fiddle::Function.new(
  lib['GetInterfaceInfo'],
  [
    Fiddle::TYPE_VOIDP,  # pIfTable : IP_INTERFACE_INFO* optional, out
    Fiddle::TYPE_VOIDP,  # dwOutBufLen : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("IPHLPAPI.dll")]
public static extern uint GetInterfaceInfo(IntPtr pIfTable, ref uint dwOutBufLen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_GetInterfaceInfo' -Namespace Win32 -PassThru
# $api::GetInterfaceInfo(pIfTable, dwOutBufLen)

#uselib "IPHLPAPI.dll"
#func global GetInterfaceInfo "GetInterfaceInfo" sptr, sptr
; GetInterfaceInfo varptr(pIfTable), varptr(dwOutBufLen)   ; 戻り値は stat
; pIfTable : IP_INTERFACE_INFO* optional, out -> "sptr"
; dwOutBufLen : 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 GetInterfaceInfo "GetInterfaceInfo" var, var
; res = GetInterfaceInfo(pIfTable, dwOutBufLen)
; pIfTable : IP_INTERFACE_INFO* optional, out -> "var"
; dwOutBufLen : 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 GetInterfaceInfo(IP_INTERFACE_INFO* pIfTable, DWORD* dwOutBufLen)
#uselib "IPHLPAPI.dll"
#cfunc global GetInterfaceInfo "GetInterfaceInfo" var, var
; res = GetInterfaceInfo(pIfTable, dwOutBufLen)
; pIfTable : IP_INTERFACE_INFO* optional, out -> "var"
; dwOutBufLen : 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")
	procGetInterfaceInfo = iphlpapi.NewProc("GetInterfaceInfo")
)

// pIfTable (IP_INTERFACE_INFO* optional, out), dwOutBufLen (DWORD* in/out)
r1, _, err := procGetInterfaceInfo.Call(
	uintptr(pIfTable),
	uintptr(dwOutBufLen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function GetInterfaceInfo(
  pIfTable: Pointer;   // IP_INTERFACE_INFO* optional, out
  dwOutBufLen: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'IPHLPAPI.dll' name 'GetInterfaceInfo';

result := DllCall("IPHLPAPI\GetInterfaceInfo"
    , "Ptr", pIfTable   ; IP_INTERFACE_INFO* optional, out
    , "Ptr", dwOutBufLen   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●GetInterfaceInfo(pIfTable, dwOutBufLen) = DLL("IPHLPAPI.dll", "dword GetInterfaceInfo(void*, void*)")
# 呼び出し: GetInterfaceInfo(pIfTable, dwOutBufLen)
# pIfTable : IP_INTERFACE_INFO* optional, out -> "void*"
# dwOutBufLen : 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)。