RtlEthernetAddressToStringA

// ntdll.dll  (ANSI / -A)
#include <windows.h>

LPSTR RtlEthernetAddressToStringA(
    const DL_EUI48* Addr,
    LPSTR S
);

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

' Addr : DL_EUI48*
' S : LPSTR out
Declare PtrSafe Function RtlEthernetAddressToStringA Lib "ntdll" ( _
    ByVal Addr As LongPtr, _
    ByVal S As String) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ntdll.dll')
RtlEthernetAddressToStringA = Fiddle::Function.new(
  lib['RtlEthernetAddressToStringA'],
  [
    Fiddle::TYPE_VOIDP,  # Addr : DL_EUI48*
    Fiddle::TYPE_VOIDP,  # S : LPSTR out
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "ntdll")]
extern "system" {
    fn RtlEthernetAddressToStringA(
        Addr: *const DL_EUI48,  // DL_EUI48*
        S: *mut u8  // LPSTR out
    ) -> *mut u8;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "ntdll.dll"
#func global RtlEthernetAddressToStringA "RtlEthernetAddressToStringA" sptr, sptr
; RtlEthernetAddressToStringA varptr(Addr), varptr(S)   ; 戻り値は stat
; Addr : DL_EUI48* -> "sptr"
; S : LPSTR 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 "ntdll.dll"
#cfunc global RtlEthernetAddressToStringA "RtlEthernetAddressToStringA" var, var
; res = RtlEthernetAddressToStringA(Addr, S)
; Addr : DL_EUI48* -> "var"
; S : LPSTR 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。

; LPSTR RtlEthernetAddressToStringA(DL_EUI48* Addr, LPSTR S)
#uselib "ntdll.dll"
#cfunc global RtlEthernetAddressToStringA "RtlEthernetAddressToStringA" var, var
; res = RtlEthernetAddressToStringA(Addr, S)
; Addr : DL_EUI48* -> "var"
; S : LPSTR 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")
	procRtlEthernetAddressToStringA = ntdll.NewProc("RtlEthernetAddressToStringA")
)

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

function RtlEthernetAddressToStringA(
  Addr: Pointer;   // DL_EUI48*
  S: PAnsiChar   // LPSTR out
): PAnsiChar; stdcall;
  external 'ntdll.dll' name 'RtlEthernetAddressToStringA';

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

●RtlEthernetAddressToStringA(Addr, S) = DLL("ntdll.dll", "char* RtlEthernetAddressToStringA(void*, char*)")
# 呼び出し: RtlEthernetAddressToStringA(Addr, S)
# Addr : DL_EUI48* -> "void*"
# S : LPSTR 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)。