DhcpV6GetStatelessStatistics

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

DWORD DhcpV6GetStatelessStatistics(
    LPWSTR ServerIpAddress,   // optional
    DHCPV6_STATELESS_STATS** StatelessStats
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV6GetStatelessStatistics(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    StatelessStats As IntPtr   ' DHCPV6_STATELESS_STATS** out
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' StatelessStats : DHCPV6_STATELESS_STATS** out
Declare PtrSafe Function DhcpV6GetStatelessStatistics Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal StatelessStats As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DhcpV6GetStatelessStatistics = ctypes.windll.dhcpsapi.DhcpV6GetStatelessStatistics
DhcpV6GetStatelessStatistics.restype = wintypes.DWORD
DhcpV6GetStatelessStatistics.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    ctypes.c_void_p,  # StatelessStats : DHCPV6_STATELESS_STATS** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV6GetStatelessStatistics = Fiddle::Function.new(
  lib['DhcpV6GetStatelessStatistics'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # StatelessStats : DHCPV6_STATELESS_STATS** out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV6GetStatelessStatistics(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        StatelessStats: *mut *mut DHCPV6_STATELESS_STATS  // DHCPV6_STATELESS_STATS** out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV6GetStatelessStatistics([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, IntPtr StatelessStats);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV6GetStatelessStatistics' -Namespace Win32 -PassThru
# $api::DhcpV6GetStatelessStatistics(ServerIpAddress, StatelessStats)

#uselib "DHCPSAPI.dll"
#func global DhcpV6GetStatelessStatistics "DhcpV6GetStatelessStatistics" sptr, sptr
; DhcpV6GetStatelessStatistics ServerIpAddress, varptr(StatelessStats)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; StatelessStats : DHCPV6_STATELESS_STATS** 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 "DHCPSAPI.dll"
#cfunc global DhcpV6GetStatelessStatistics "DhcpV6GetStatelessStatistics" wstr, var
; res = DhcpV6GetStatelessStatistics(ServerIpAddress, StatelessStats)
; ServerIpAddress : LPWSTR optional -> "wstr"
; StatelessStats : DHCPV6_STATELESS_STATS** 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 DhcpV6GetStatelessStatistics(LPWSTR ServerIpAddress, DHCPV6_STATELESS_STATS** StatelessStats)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV6GetStatelessStatistics "DhcpV6GetStatelessStatistics" wstr, var
; res = DhcpV6GetStatelessStatistics(ServerIpAddress, StatelessStats)
; ServerIpAddress : LPWSTR optional -> "wstr"
; StatelessStats : DHCPV6_STATELESS_STATS** 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 (
	dhcpsapi = windows.NewLazySystemDLL("DHCPSAPI.dll")
	procDhcpV6GetStatelessStatistics = dhcpsapi.NewProc("DhcpV6GetStatelessStatistics")
)

// ServerIpAddress (LPWSTR optional), StatelessStats (DHCPV6_STATELESS_STATS** out)
r1, _, err := procDhcpV6GetStatelessStatistics.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(StatelessStats),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV6GetStatelessStatistics(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  StatelessStats: Pointer   // DHCPV6_STATELESS_STATS** out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV6GetStatelessStatistics';

result := DllCall("DHCPSAPI\DhcpV6GetStatelessStatistics"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "Ptr", StatelessStats   ; DHCPV6_STATELESS_STATS** out
    , "UInt")   ; return: DWORD

●DhcpV6GetStatelessStatistics(ServerIpAddress, StatelessStats) = DLL("DHCPSAPI.dll", "dword DhcpV6GetStatelessStatistics(char*, void*)")
# 呼び出し: DhcpV6GetStatelessStatistics(ServerIpAddress, StatelessStats)
# ServerIpAddress : LPWSTR optional -> "char*"
# StatelessStats : DHCPV6_STATELESS_STATS** 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)。