DhcpEnumOptions

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

DWORD DhcpEnumOptions(
    LPCWSTR ServerIpAddress,   // optional
    DWORD* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_OPTION_ARRAY** Options,
    DWORD* OptionsRead,
    DWORD* OptionsTotal
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpEnumOptions(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPCWSTR optional
    ByRef ResumeHandle As UInteger,   ' DWORD* in/out
    PreferredMaximum As UInteger,   ' DWORD
    Options As IntPtr,   ' DHCP_OPTION_ARRAY** in/out
    ByRef OptionsRead As UInteger,   ' DWORD* in/out
    ByRef OptionsTotal As UInteger   ' DWORD* in/out
) As UInteger
End Function

' ServerIpAddress : LPCWSTR optional
' ResumeHandle : DWORD* in/out
' PreferredMaximum : DWORD
' Options : DHCP_OPTION_ARRAY** in/out
' OptionsRead : DWORD* in/out
' OptionsTotal : DWORD* in/out
Declare PtrSafe Function DhcpEnumOptions Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByRef ResumeHandle As Long, _
    ByVal PreferredMaximum As Long, _
    ByVal Options As LongPtr, _
    ByRef OptionsRead As Long, _
    ByRef OptionsTotal 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

DhcpEnumOptions = ctypes.windll.dhcpsapi.DhcpEnumOptions
DhcpEnumOptions.restype = wintypes.DWORD
DhcpEnumOptions.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPCWSTR optional
    ctypes.POINTER(wintypes.DWORD),  # ResumeHandle : DWORD* in/out
    wintypes.DWORD,  # PreferredMaximum : DWORD
    ctypes.c_void_p,  # Options : DHCP_OPTION_ARRAY** in/out
    ctypes.POINTER(wintypes.DWORD),  # OptionsRead : DWORD* in/out
    ctypes.POINTER(wintypes.DWORD),  # OptionsTotal : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpEnumOptions = Fiddle::Function.new(
  lib['DhcpEnumOptions'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # ResumeHandle : DWORD* in/out
    -Fiddle::TYPE_INT,  # PreferredMaximum : DWORD
    Fiddle::TYPE_VOIDP,  # Options : DHCP_OPTION_ARRAY** in/out
    Fiddle::TYPE_VOIDP,  # OptionsRead : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # OptionsTotal : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpEnumOptions(
        ServerIpAddress: *const u16,  // LPCWSTR optional
        ResumeHandle: *mut u32,  // DWORD* in/out
        PreferredMaximum: u32,  // DWORD
        Options: *mut *mut DHCP_OPTION_ARRAY,  // DHCP_OPTION_ARRAY** in/out
        OptionsRead: *mut u32,  // DWORD* in/out
        OptionsTotal: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpEnumOptions([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, ref uint ResumeHandle, uint PreferredMaximum, IntPtr Options, ref uint OptionsRead, ref uint OptionsTotal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpEnumOptions' -Namespace Win32 -PassThru
# $api::DhcpEnumOptions(ServerIpAddress, ResumeHandle, PreferredMaximum, Options, OptionsRead, OptionsTotal)

#uselib "DHCPSAPI.dll"
#func global DhcpEnumOptions "DhcpEnumOptions" sptr, sptr, sptr, sptr, sptr, sptr
; DhcpEnumOptions ServerIpAddress, varptr(ResumeHandle), PreferredMaximum, varptr(Options), varptr(OptionsRead), varptr(OptionsTotal)   ; 戻り値は stat
; ServerIpAddress : LPCWSTR optional -> "sptr"
; ResumeHandle : DWORD* in/out -> "sptr"
; PreferredMaximum : DWORD -> "sptr"
; Options : DHCP_OPTION_ARRAY** in/out -> "sptr"
; OptionsRead : DWORD* in/out -> "sptr"
; OptionsTotal : 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 "DHCPSAPI.dll"
#cfunc global DhcpEnumOptions "DhcpEnumOptions" wstr, var, int, var, var, var
; res = DhcpEnumOptions(ServerIpAddress, ResumeHandle, PreferredMaximum, Options, OptionsRead, OptionsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; Options : DHCP_OPTION_ARRAY** in/out -> "var"
; OptionsRead : DWORD* in/out -> "var"
; OptionsTotal : 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 DhcpEnumOptions(LPCWSTR ServerIpAddress, DWORD* ResumeHandle, DWORD PreferredMaximum, DHCP_OPTION_ARRAY** Options, DWORD* OptionsRead, DWORD* OptionsTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpEnumOptions "DhcpEnumOptions" wstr, var, int, var, var, var
; res = DhcpEnumOptions(ServerIpAddress, ResumeHandle, PreferredMaximum, Options, OptionsRead, OptionsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; Options : DHCP_OPTION_ARRAY** in/out -> "var"
; OptionsRead : DWORD* in/out -> "var"
; OptionsTotal : 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 (
	dhcpsapi = windows.NewLazySystemDLL("DHCPSAPI.dll")
	procDhcpEnumOptions = dhcpsapi.NewProc("DhcpEnumOptions")
)

// ServerIpAddress (LPCWSTR optional), ResumeHandle (DWORD* in/out), PreferredMaximum (DWORD), Options (DHCP_OPTION_ARRAY** in/out), OptionsRead (DWORD* in/out), OptionsTotal (DWORD* in/out)
r1, _, err := procDhcpEnumOptions.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(ResumeHandle),
	uintptr(PreferredMaximum),
	uintptr(Options),
	uintptr(OptionsRead),
	uintptr(OptionsTotal),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpEnumOptions(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  ResumeHandle: Pointer;   // DWORD* in/out
  PreferredMaximum: DWORD;   // DWORD
  Options: Pointer;   // DHCP_OPTION_ARRAY** in/out
  OptionsRead: Pointer;   // DWORD* in/out
  OptionsTotal: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpEnumOptions';

result := DllCall("DHCPSAPI\DhcpEnumOptions"
    , "WStr", ServerIpAddress   ; LPCWSTR optional
    , "Ptr", ResumeHandle   ; DWORD* in/out
    , "UInt", PreferredMaximum   ; DWORD
    , "Ptr", Options   ; DHCP_OPTION_ARRAY** in/out
    , "Ptr", OptionsRead   ; DWORD* in/out
    , "Ptr", OptionsTotal   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●DhcpEnumOptions(ServerIpAddress, ResumeHandle, PreferredMaximum, Options, OptionsRead, OptionsTotal) = DLL("DHCPSAPI.dll", "dword DhcpEnumOptions(char*, void*, dword, void*, void*, void*)")
# 呼び出し: DhcpEnumOptions(ServerIpAddress, ResumeHandle, PreferredMaximum, Options, OptionsRead, OptionsTotal)
# ServerIpAddress : LPCWSTR optional -> "char*"
# ResumeHandle : DWORD* in/out -> "void*"
# PreferredMaximum : DWORD -> "dword"
# Options : DHCP_OPTION_ARRAY** in/out -> "void*"
# OptionsRead : DWORD* in/out -> "void*"
# OptionsTotal : 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)。