DhcpGetFilterV4

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

DWORD DhcpGetFilterV4(
    LPCWSTR ServerIpAddress,   // optional
    DHCP_FILTER_GLOBAL_INFO* GlobalFilterInfo
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpGetFilterV4(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPCWSTR optional
    GlobalFilterInfo As IntPtr   ' DHCP_FILTER_GLOBAL_INFO* out
) As UInteger
End Function

' ServerIpAddress : LPCWSTR optional
' GlobalFilterInfo : DHCP_FILTER_GLOBAL_INFO* out
Declare PtrSafe Function DhcpGetFilterV4 Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal GlobalFilterInfo 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

DhcpGetFilterV4 = ctypes.windll.dhcpsapi.DhcpGetFilterV4
DhcpGetFilterV4.restype = wintypes.DWORD
DhcpGetFilterV4.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPCWSTR optional
    ctypes.c_void_p,  # GlobalFilterInfo : DHCP_FILTER_GLOBAL_INFO* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpGetFilterV4 = Fiddle::Function.new(
  lib['DhcpGetFilterV4'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # GlobalFilterInfo : DHCP_FILTER_GLOBAL_INFO* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpGetFilterV4(
        ServerIpAddress: *const u16,  // LPCWSTR optional
        GlobalFilterInfo: *mut DHCP_FILTER_GLOBAL_INFO  // DHCP_FILTER_GLOBAL_INFO* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpGetFilterV4([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, IntPtr GlobalFilterInfo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpGetFilterV4' -Namespace Win32 -PassThru
# $api::DhcpGetFilterV4(ServerIpAddress, GlobalFilterInfo)

#uselib "DHCPSAPI.dll"
#func global DhcpGetFilterV4 "DhcpGetFilterV4" sptr, sptr
; DhcpGetFilterV4 ServerIpAddress, varptr(GlobalFilterInfo)   ; 戻り値は stat
; ServerIpAddress : LPCWSTR optional -> "sptr"
; GlobalFilterInfo : DHCP_FILTER_GLOBAL_INFO* 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 DhcpGetFilterV4 "DhcpGetFilterV4" wstr, var
; res = DhcpGetFilterV4(ServerIpAddress, GlobalFilterInfo)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; GlobalFilterInfo : DHCP_FILTER_GLOBAL_INFO* 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 DhcpGetFilterV4(LPCWSTR ServerIpAddress, DHCP_FILTER_GLOBAL_INFO* GlobalFilterInfo)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpGetFilterV4 "DhcpGetFilterV4" wstr, var
; res = DhcpGetFilterV4(ServerIpAddress, GlobalFilterInfo)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; GlobalFilterInfo : DHCP_FILTER_GLOBAL_INFO* 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")
	procDhcpGetFilterV4 = dhcpsapi.NewProc("DhcpGetFilterV4")
)

// ServerIpAddress (LPCWSTR optional), GlobalFilterInfo (DHCP_FILTER_GLOBAL_INFO* out)
r1, _, err := procDhcpGetFilterV4.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(GlobalFilterInfo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpGetFilterV4(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  GlobalFilterInfo: Pointer   // DHCP_FILTER_GLOBAL_INFO* out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpGetFilterV4';

result := DllCall("DHCPSAPI\DhcpGetFilterV4"
    , "WStr", ServerIpAddress   ; LPCWSTR optional
    , "Ptr", GlobalFilterInfo   ; DHCP_FILTER_GLOBAL_INFO* out
    , "UInt")   ; return: DWORD

●DhcpGetFilterV4(ServerIpAddress, GlobalFilterInfo) = DLL("DHCPSAPI.dll", "dword DhcpGetFilterV4(char*, void*)")
# 呼び出し: DhcpGetFilterV4(ServerIpAddress, GlobalFilterInfo)
# ServerIpAddress : LPCWSTR optional -> "char*"
# GlobalFilterInfo : DHCP_FILTER_GLOBAL_INFO* 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)。