DhcpSetClientInfoV4

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

DWORD DhcpSetClientInfoV4(
    LPCWSTR ServerIpAddress,   // optional
    const DHCP_CLIENT_INFO_V4* ClientInfo
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpSetClientInfoV4(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPCWSTR optional
    ClientInfo As IntPtr   ' DHCP_CLIENT_INFO_V4*
) As UInteger
End Function

' ServerIpAddress : LPCWSTR optional
' ClientInfo : DHCP_CLIENT_INFO_V4*
Declare PtrSafe Function DhcpSetClientInfoV4 Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal ClientInfo 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

DhcpSetClientInfoV4 = ctypes.windll.dhcpsapi.DhcpSetClientInfoV4
DhcpSetClientInfoV4.restype = wintypes.DWORD
DhcpSetClientInfoV4.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPCWSTR optional
    ctypes.c_void_p,  # ClientInfo : DHCP_CLIENT_INFO_V4*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpSetClientInfoV4 = Fiddle::Function.new(
  lib['DhcpSetClientInfoV4'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # ClientInfo : DHCP_CLIENT_INFO_V4*
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpSetClientInfoV4(
        ServerIpAddress: *const u16,  // LPCWSTR optional
        ClientInfo: *const DHCP_CLIENT_INFO_V4  // DHCP_CLIENT_INFO_V4*
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpSetClientInfoV4([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, IntPtr ClientInfo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpSetClientInfoV4' -Namespace Win32 -PassThru
# $api::DhcpSetClientInfoV4(ServerIpAddress, ClientInfo)

#uselib "DHCPSAPI.dll"
#func global DhcpSetClientInfoV4 "DhcpSetClientInfoV4" sptr, sptr
; DhcpSetClientInfoV4 ServerIpAddress, varptr(ClientInfo)   ; 戻り値は stat
; ServerIpAddress : LPCWSTR optional -> "sptr"
; ClientInfo : DHCP_CLIENT_INFO_V4* -> "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 DhcpSetClientInfoV4 "DhcpSetClientInfoV4" wstr, var
; res = DhcpSetClientInfoV4(ServerIpAddress, ClientInfo)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ClientInfo : DHCP_CLIENT_INFO_V4* -> "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 DhcpSetClientInfoV4(LPCWSTR ServerIpAddress, DHCP_CLIENT_INFO_V4* ClientInfo)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpSetClientInfoV4 "DhcpSetClientInfoV4" wstr, var
; res = DhcpSetClientInfoV4(ServerIpAddress, ClientInfo)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ClientInfo : DHCP_CLIENT_INFO_V4* -> "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")
	procDhcpSetClientInfoV4 = dhcpsapi.NewProc("DhcpSetClientInfoV4")
)

// ServerIpAddress (LPCWSTR optional), ClientInfo (DHCP_CLIENT_INFO_V4*)
r1, _, err := procDhcpSetClientInfoV4.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(ClientInfo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpSetClientInfoV4(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  ClientInfo: Pointer   // DHCP_CLIENT_INFO_V4*
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpSetClientInfoV4';

result := DllCall("DHCPSAPI\DhcpSetClientInfoV4"
    , "WStr", ServerIpAddress   ; LPCWSTR optional
    , "Ptr", ClientInfo   ; DHCP_CLIENT_INFO_V4*
    , "UInt")   ; return: DWORD

●DhcpSetClientInfoV4(ServerIpAddress, ClientInfo) = DLL("DHCPSAPI.dll", "dword DhcpSetClientInfoV4(char*, void*)")
# 呼び出し: DhcpSetClientInfoV4(ServerIpAddress, ClientInfo)
# ServerIpAddress : LPCWSTR optional -> "char*"
# ClientInfo : DHCP_CLIENT_INFO_V4* -> "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)。