DhcpCreateClass

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

DWORD DhcpCreateClass(
    LPWSTR ServerIpAddress,   // optional
    DWORD ReservedMustBeZero,
    DHCP_CLASS_INFO* ClassInfo
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpCreateClass(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    ReservedMustBeZero As UInteger,   ' DWORD
    ClassInfo As IntPtr   ' DHCP_CLASS_INFO* in/out
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' ReservedMustBeZero : DWORD
' ClassInfo : DHCP_CLASS_INFO* in/out
Declare PtrSafe Function DhcpCreateClass Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal ReservedMustBeZero As Long, _
    ByVal ClassInfo 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

DhcpCreateClass = ctypes.windll.dhcpsapi.DhcpCreateClass
DhcpCreateClass.restype = wintypes.DWORD
DhcpCreateClass.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    wintypes.DWORD,  # ReservedMustBeZero : DWORD
    ctypes.c_void_p,  # ClassInfo : DHCP_CLASS_INFO* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpCreateClass = Fiddle::Function.new(
  lib['DhcpCreateClass'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    -Fiddle::TYPE_INT,  # ReservedMustBeZero : DWORD
    Fiddle::TYPE_VOIDP,  # ClassInfo : DHCP_CLASS_INFO* in/out
  ],
  -Fiddle::TYPE_INT)

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

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

#uselib "DHCPSAPI.dll"
#func global DhcpCreateClass "DhcpCreateClass" sptr, sptr, sptr
; DhcpCreateClass ServerIpAddress, ReservedMustBeZero, varptr(ClassInfo)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; ReservedMustBeZero : DWORD -> "sptr"
; ClassInfo : DHCP_CLASS_INFO* 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。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	dhcpsapi = windows.NewLazySystemDLL("DHCPSAPI.dll")
	procDhcpCreateClass = dhcpsapi.NewProc("DhcpCreateClass")
)

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

function DhcpCreateClass(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  ReservedMustBeZero: DWORD;   // DWORD
  ClassInfo: Pointer   // DHCP_CLASS_INFO* in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpCreateClass';

result := DllCall("DHCPSAPI\DhcpCreateClass"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "UInt", ReservedMustBeZero   ; DWORD
    , "Ptr", ClassInfo   ; DHCP_CLASS_INFO* in/out
    , "UInt")   ; return: DWORD

●DhcpCreateClass(ServerIpAddress, ReservedMustBeZero, ClassInfo) = DLL("DHCPSAPI.dll", "dword DhcpCreateClass(char*, dword, void*)")
# 呼び出し: DhcpCreateClass(ServerIpAddress, ReservedMustBeZero, ClassInfo)
# ServerIpAddress : LPWSTR optional -> "char*"
# ReservedMustBeZero : DWORD -> "dword"
# ClassInfo : DHCP_CLASS_INFO* 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)。

const std = @import("std");

extern "dhcpsapi" fn DhcpCreateClass(
    ServerIpAddress: [*c]const u16, // LPWSTR optional
    ReservedMustBeZero: u32, // DWORD
    ClassInfo: [*c]DHCP_CLASS_INFO // DHCP_CLASS_INFO* in/out
) callconv(std.os.windows.WINAPI) u32;

proc DhcpCreateClass(
    ServerIpAddress: WideCString,  # LPWSTR optional
    ReservedMustBeZero: uint32,  # DWORD
    ClassInfo: ptr DHCP_CLASS_INFO  # DHCP_CLASS_INFO* in/out
): uint32 {.importc: "DhcpCreateClass", stdcall, dynlib: "DHCPSAPI.dll".}

pragma(lib, "dhcpsapi");
extern(Windows)
uint DhcpCreateClass(
    const(wchar)* ServerIpAddress,   // LPWSTR optional
    uint ReservedMustBeZero,   // DWORD
    DHCP_CLASS_INFO* ClassInfo   // DHCP_CLASS_INFO* in/out
);

ccall((:DhcpCreateClass, "DHCPSAPI.dll"), stdcall, UInt32,
      (Cwstring, UInt32, Ptr{DHCP_CLASS_INFO}),
      ServerIpAddress, ReservedMustBeZero, ClassInfo)
# ServerIpAddress : LPWSTR optional -> Cwstring
# ReservedMustBeZero : DWORD -> UInt32
# ClassInfo : DHCP_CLASS_INFO* in/out -> Ptr{DHCP_CLASS_INFO}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t DhcpCreateClass(
    const uint16_t* ServerIpAddress,
    uint32_t ReservedMustBeZero,
    void* ClassInfo);
]]
local dhcpsapi = ffi.load("dhcpsapi")
-- dhcpsapi.DhcpCreateClass(ServerIpAddress, ReservedMustBeZero, ClassInfo)
-- ServerIpAddress : LPWSTR optional
-- ReservedMustBeZero : DWORD
-- ClassInfo : DHCP_CLASS_INFO* in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('DHCPSAPI.dll');
const DhcpCreateClass = lib.func('__stdcall', 'DhcpCreateClass', 'uint32_t', ['str16', 'uint32_t', 'void *']);
// DhcpCreateClass(ServerIpAddress, ReservedMustBeZero, ClassInfo)
// ServerIpAddress : LPWSTR optional -> 'str16'
// ReservedMustBeZero : DWORD -> 'uint32_t'
// ClassInfo : DHCP_CLASS_INFO* in/out -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("DHCPSAPI.dll", {
  DhcpCreateClass: { parameters: ["buffer", "u32", "pointer"], result: "u32" },
});
// lib.symbols.DhcpCreateClass(ServerIpAddress, ReservedMustBeZero, ClassInfo)
// ServerIpAddress : LPWSTR optional -> "buffer"
// ReservedMustBeZero : DWORD -> "u32"
// ClassInfo : DHCP_CLASS_INFO* in/out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
uint32_t DhcpCreateClass(
    const uint16_t* ServerIpAddress,
    uint32_t ReservedMustBeZero,
    void* ClassInfo);
C, "DHCPSAPI.dll");
// $ffi->DhcpCreateClass(ServerIpAddress, ReservedMustBeZero, ClassInfo);
// ServerIpAddress : LPWSTR optional
// ReservedMustBeZero : DWORD
// ClassInfo : DHCP_CLASS_INFO* in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Dhcpsapi extends StdCallLibrary {
    Dhcpsapi INSTANCE = Native.load("dhcpsapi", Dhcpsapi.class);
    int DhcpCreateClass(
        WString ServerIpAddress,   // LPWSTR optional
        int ReservedMustBeZero,   // DWORD
        Pointer ClassInfo   // DHCP_CLASS_INFO* in/out
    );
}

@[Link("dhcpsapi")]
lib LibDHCPSAPI
  fun DhcpCreateClass = DhcpCreateClass(
    ServerIpAddress : UInt16*,   # LPWSTR optional
    ReservedMustBeZero : UInt32,   # DWORD
    ClassInfo : DHCP_CLASS_INFO*   # DHCP_CLASS_INFO* in/out
  ) : UInt32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef DhcpCreateClassNative = Uint32 Function(Pointer<Utf16>, Uint32, Pointer<Void>);
typedef DhcpCreateClassDart = int Function(Pointer<Utf16>, int, Pointer<Void>);
final DhcpCreateClass = DynamicLibrary.open('DHCPSAPI.dll')
    .lookupFunction<DhcpCreateClassNative, DhcpCreateClassDart>('DhcpCreateClass');
// ServerIpAddress : LPWSTR optional -> Pointer<Utf16>
// ReservedMustBeZero : DWORD -> Uint32
// ClassInfo : DHCP_CLASS_INFO* in/out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function DhcpCreateClass(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  ReservedMustBeZero: DWORD;   // DWORD
  ClassInfo: Pointer   // DHCP_CLASS_INFO* in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpCreateClass';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "DhcpCreateClass"
  c_DhcpCreateClass :: CWString -> Word32 -> Ptr () -> IO Word32
-- ServerIpAddress : LPWSTR optional -> CWString
-- ReservedMustBeZero : DWORD -> Word32
-- ClassInfo : DHCP_CLASS_INFO* in/out -> Ptr ()
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let dhcpcreateclass =
  foreign "DhcpCreateClass"
    ((ptr uint16_t) @-> uint32_t @-> (ptr void) @-> returning uint32_t)
(* ServerIpAddress : LPWSTR optional -> (ptr uint16_t) *)
(* ReservedMustBeZero : DWORD -> uint32_t *)
(* ClassInfo : DHCP_CLASS_INFO* in/out -> (ptr void) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library dhcpsapi (t "DHCPSAPI.dll"))
(cffi:use-foreign-library dhcpsapi)

(cffi:defcfun ("DhcpCreateClass" dhcp-create-class :convention :stdcall) :uint32
  (server-ip-address (:string :encoding :utf-16le))   ; LPWSTR optional
  (reserved-must-be-zero :uint32)   ; DWORD
  (class-info :pointer))   ; DHCP_CLASS_INFO* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $DhcpCreateClass = Win32::API::More->new('DHCPSAPI',
    'DWORD DhcpCreateClass(LPCWSTR ServerIpAddress, DWORD ReservedMustBeZero, LPVOID ClassInfo)');
# my $ret = $DhcpCreateClass->Call($ServerIpAddress, $ReservedMustBeZero, $ClassInfo);
# ServerIpAddress : LPWSTR optional -> LPCWSTR
# ReservedMustBeZero : DWORD -> DWORD
# ClassInfo : DHCP_CLASS_INFO* in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。