RtlEthernetAddressToStringW

// ntdll.dll  (Unicode / -W)
#include <windows.h>

LPWSTR RtlEthernetAddressToStringW(
    const DL_EUI48* Addr,
    LPWSTR S
);

<DllImport("ntdll.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function RtlEthernetAddressToStringW(
    Addr As IntPtr,   ' DL_EUI48*
    <MarshalAs(UnmanagedType.LPWStr)> S As System.Text.StringBuilder   ' LPWSTR out
) As IntPtr
End Function

' Addr : DL_EUI48*
' S : LPWSTR out
Declare PtrSafe Function RtlEthernetAddressToStringW Lib "ntdll" ( _
    ByVal Addr As LongPtr, _
    ByVal S As LongPtr) As LongPtr
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RtlEthernetAddressToStringW = ctypes.windll.ntdll.RtlEthernetAddressToStringW
RtlEthernetAddressToStringW.restype = wintypes.LPWSTR
RtlEthernetAddressToStringW.argtypes = [
    ctypes.c_void_p,  # Addr : DL_EUI48*
    wintypes.LPWSTR,  # S : LPWSTR out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlEthernetAddressToStringW = Fiddle::Function.new(
  lib['RtlEthernetAddressToStringW'],
  [
    Fiddle::TYPE_VOIDP,  # Addr : DL_EUI48*
    Fiddle::TYPE_VOIDP,  # S : LPWSTR out
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "ntdll")]
extern "system" {
    fn RtlEthernetAddressToStringW(
        Addr: *const DL_EUI48,  // DL_EUI48*
        S: *mut u16  // LPWSTR out
    ) -> *mut u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ntdll.dll", CharSet = CharSet.Unicode)]
public static extern IntPtr RtlEthernetAddressToStringW(IntPtr Addr, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder S);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ntdll_RtlEthernetAddressToStringW' -Namespace Win32 -PassThru
# $api::RtlEthernetAddressToStringW(Addr, S)

#uselib "ntdll.dll"
#func global RtlEthernetAddressToStringW "RtlEthernetAddressToStringW" wptr, wptr
; RtlEthernetAddressToStringW varptr(Addr), varptr(S)   ; 戻り値は stat
; Addr : DL_EUI48* -> "wptr"
; S : LPWSTR out -> "wptr"
; ※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 "ntdll.dll"
#cfunc global RtlEthernetAddressToStringW "RtlEthernetAddressToStringW" var, var
; res = RtlEthernetAddressToStringW(Addr, S)
; Addr : DL_EUI48* -> "var"
; S : LPWSTR 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。

; LPWSTR RtlEthernetAddressToStringW(DL_EUI48* Addr, LPWSTR S)
#uselib "ntdll.dll"
#cfunc global RtlEthernetAddressToStringW "RtlEthernetAddressToStringW" var, var
; res = RtlEthernetAddressToStringW(Addr, S)
; Addr : DL_EUI48* -> "var"
; S : LPWSTR 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 (
	ntdll = windows.NewLazySystemDLL("ntdll.dll")
	procRtlEthernetAddressToStringW = ntdll.NewProc("RtlEthernetAddressToStringW")
)

// Addr (DL_EUI48*), S (LPWSTR out)
r1, _, err := procRtlEthernetAddressToStringW.Call(
	uintptr(Addr),
	uintptr(S),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LPWSTR

function RtlEthernetAddressToStringW(
  Addr: Pointer;   // DL_EUI48*
  S: PWideChar   // LPWSTR out
): PWideChar; stdcall;
  external 'ntdll.dll' name 'RtlEthernetAddressToStringW';

result := DllCall("ntdll\RtlEthernetAddressToStringW"
    , "Ptr", Addr   ; DL_EUI48*
    , "Ptr", S   ; LPWSTR out
    , "Ptr")   ; return: LPWSTR

●RtlEthernetAddressToStringW(Addr, S) = DLL("ntdll.dll", "char* RtlEthernetAddressToStringW(void*, char*)")
# 呼び出し: RtlEthernetAddressToStringW(Addr, S)
# Addr : DL_EUI48* -> "void*"
# S : LPWSTR out -> "char*"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。