DhcpScanDatabase

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

DWORD DhcpScanDatabase(
    LPCWSTR ServerIpAddress,   // optional
    DWORD SubnetAddress,
    DWORD FixFlag,
    DHCP_SCAN_LIST** ScanList
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpScanDatabase(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPCWSTR optional
    SubnetAddress As UInteger,   ' DWORD
    FixFlag As UInteger,   ' DWORD
    ScanList As IntPtr   ' DHCP_SCAN_LIST** in/out
) As UInteger
End Function

' ServerIpAddress : LPCWSTR optional
' SubnetAddress : DWORD
' FixFlag : DWORD
' ScanList : DHCP_SCAN_LIST** in/out
Declare PtrSafe Function DhcpScanDatabase Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal SubnetAddress As Long, _
    ByVal FixFlag As Long, _
    ByVal ScanList 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

DhcpScanDatabase = ctypes.windll.dhcpsapi.DhcpScanDatabase
DhcpScanDatabase.restype = wintypes.DWORD
DhcpScanDatabase.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPCWSTR optional
    wintypes.DWORD,  # SubnetAddress : DWORD
    wintypes.DWORD,  # FixFlag : DWORD
    ctypes.c_void_p,  # ScanList : DHCP_SCAN_LIST** in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpScanDatabase = Fiddle::Function.new(
  lib['DhcpScanDatabase'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPCWSTR optional
    -Fiddle::TYPE_INT,  # SubnetAddress : DWORD
    -Fiddle::TYPE_INT,  # FixFlag : DWORD
    Fiddle::TYPE_VOIDP,  # ScanList : DHCP_SCAN_LIST** in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpScanDatabase(
        ServerIpAddress: *const u16,  // LPCWSTR optional
        SubnetAddress: u32,  // DWORD
        FixFlag: u32,  // DWORD
        ScanList: *mut *mut DHCP_SCAN_LIST  // DHCP_SCAN_LIST** in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "DHCPSAPI.dll"
#func global DhcpScanDatabase "DhcpScanDatabase" sptr, sptr, sptr, sptr
; DhcpScanDatabase ServerIpAddress, SubnetAddress, FixFlag, varptr(ScanList)   ; 戻り値は stat
; ServerIpAddress : LPCWSTR optional -> "sptr"
; SubnetAddress : DWORD -> "sptr"
; FixFlag : DWORD -> "sptr"
; ScanList : DHCP_SCAN_LIST** 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 DhcpScanDatabase "DhcpScanDatabase" wstr, int, int, var
; res = DhcpScanDatabase(ServerIpAddress, SubnetAddress, FixFlag, ScanList)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; FixFlag : DWORD -> "int"
; ScanList : DHCP_SCAN_LIST** 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 DhcpScanDatabase(LPCWSTR ServerIpAddress, DWORD SubnetAddress, DWORD FixFlag, DHCP_SCAN_LIST** ScanList)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpScanDatabase "DhcpScanDatabase" wstr, int, int, var
; res = DhcpScanDatabase(ServerIpAddress, SubnetAddress, FixFlag, ScanList)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; FixFlag : DWORD -> "int"
; ScanList : DHCP_SCAN_LIST** 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")
	procDhcpScanDatabase = dhcpsapi.NewProc("DhcpScanDatabase")
)

// ServerIpAddress (LPCWSTR optional), SubnetAddress (DWORD), FixFlag (DWORD), ScanList (DHCP_SCAN_LIST** in/out)
r1, _, err := procDhcpScanDatabase.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(SubnetAddress),
	uintptr(FixFlag),
	uintptr(ScanList),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpScanDatabase(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  SubnetAddress: DWORD;   // DWORD
  FixFlag: DWORD;   // DWORD
  ScanList: Pointer   // DHCP_SCAN_LIST** in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpScanDatabase';

result := DllCall("DHCPSAPI\DhcpScanDatabase"
    , "WStr", ServerIpAddress   ; LPCWSTR optional
    , "UInt", SubnetAddress   ; DWORD
    , "UInt", FixFlag   ; DWORD
    , "Ptr", ScanList   ; DHCP_SCAN_LIST** in/out
    , "UInt")   ; return: DWORD

●DhcpScanDatabase(ServerIpAddress, SubnetAddress, FixFlag, ScanList) = DLL("DHCPSAPI.dll", "dword DhcpScanDatabase(char*, dword, dword, void*)")
# 呼び出し: DhcpScanDatabase(ServerIpAddress, SubnetAddress, FixFlag, ScanList)
# ServerIpAddress : LPCWSTR optional -> "char*"
# SubnetAddress : DWORD -> "dword"
# FixFlag : DWORD -> "dword"
# ScanList : DHCP_SCAN_LIST** 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)。