SendARP

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

DWORD SendARP(
    DWORD DestIP,
    DWORD SrcIP,
    void* pMacAddr,
    DWORD* PhyAddrLen
);

<DllImport("IPHLPAPI.dll", ExactSpelling:=True)>
Public Shared Function SendARP(
    DestIP As UInteger,   ' DWORD
    SrcIP As UInteger,   ' DWORD
    pMacAddr As IntPtr,   ' void* out
    ByRef PhyAddrLen As UInteger   ' DWORD* in/out
) As UInteger
End Function

' DestIP : DWORD
' SrcIP : DWORD
' pMacAddr : void* out
' PhyAddrLen : DWORD* in/out
Declare PtrSafe Function SendARP Lib "iphlpapi" ( _
    ByVal DestIP As Long, _
    ByVal SrcIP As Long, _
    ByVal pMacAddr As LongPtr, _
    ByRef PhyAddrLen 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

SendARP = ctypes.windll.iphlpapi.SendARP
SendARP.restype = wintypes.DWORD
SendARP.argtypes = [
    wintypes.DWORD,  # DestIP : DWORD
    wintypes.DWORD,  # SrcIP : DWORD
    ctypes.POINTER(None),  # pMacAddr : void* out
    ctypes.POINTER(wintypes.DWORD),  # PhyAddrLen : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('IPHLPAPI.dll')
SendARP = Fiddle::Function.new(
  lib['SendARP'],
  [
    -Fiddle::TYPE_INT,  # DestIP : DWORD
    -Fiddle::TYPE_INT,  # SrcIP : DWORD
    Fiddle::TYPE_VOIDP,  # pMacAddr : void* out
    Fiddle::TYPE_VOIDP,  # PhyAddrLen : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "iphlpapi")]
extern "system" {
    fn SendARP(
        DestIP: u32,  // DWORD
        SrcIP: u32,  // DWORD
        pMacAddr: *mut (),  // void* out
        PhyAddrLen: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("IPHLPAPI.dll")]
public static extern uint SendARP(uint DestIP, uint SrcIP, IntPtr pMacAddr, ref uint PhyAddrLen);
"@
$api = Add-Type -MemberDefinition $sig -Name 'IPHLPAPI_SendARP' -Namespace Win32 -PassThru
# $api::SendARP(DestIP, SrcIP, pMacAddr, PhyAddrLen)

#uselib "IPHLPAPI.dll"
#func global SendARP "SendARP" sptr, sptr, sptr, sptr
; SendARP DestIP, SrcIP, pMacAddr, varptr(PhyAddrLen)   ; 戻り値は stat
; DestIP : DWORD -> "sptr"
; SrcIP : DWORD -> "sptr"
; pMacAddr : void* out -> "sptr"
; PhyAddrLen : 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 SendARP "SendARP" int, int, sptr, var
; res = SendARP(DestIP, SrcIP, pMacAddr, PhyAddrLen)
; DestIP : DWORD -> "int"
; SrcIP : DWORD -> "int"
; pMacAddr : void* out -> "sptr"
; PhyAddrLen : 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 SendARP(DWORD DestIP, DWORD SrcIP, void* pMacAddr, DWORD* PhyAddrLen)
#uselib "IPHLPAPI.dll"
#cfunc global SendARP "SendARP" int, int, intptr, var
; res = SendARP(DestIP, SrcIP, pMacAddr, PhyAddrLen)
; DestIP : DWORD -> "int"
; SrcIP : DWORD -> "int"
; pMacAddr : void* out -> "intptr"
; PhyAddrLen : 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")
	procSendARP = iphlpapi.NewProc("SendARP")
)

// DestIP (DWORD), SrcIP (DWORD), pMacAddr (void* out), PhyAddrLen (DWORD* in/out)
r1, _, err := procSendARP.Call(
	uintptr(DestIP),
	uintptr(SrcIP),
	uintptr(pMacAddr),
	uintptr(PhyAddrLen),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function SendARP(
  DestIP: DWORD;   // DWORD
  SrcIP: DWORD;   // DWORD
  pMacAddr: Pointer;   // void* out
  PhyAddrLen: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'IPHLPAPI.dll' name 'SendARP';

result := DllCall("IPHLPAPI\SendARP"
    , "UInt", DestIP   ; DWORD
    , "UInt", SrcIP   ; DWORD
    , "Ptr", pMacAddr   ; void* out
    , "Ptr", PhyAddrLen   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●SendARP(DestIP, SrcIP, pMacAddr, PhyAddrLen) = DLL("IPHLPAPI.dll", "dword SendARP(dword, dword, void*, void*)")
# 呼び出し: SendARP(DestIP, SrcIP, pMacAddr, PhyAddrLen)
# DestIP : DWORD -> "dword"
# SrcIP : DWORD -> "dword"
# pMacAddr : void* out -> "void*"
# PhyAddrLen : 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)。