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DhcpV4EnumSubnetClients

関数

指定サブネット内のIPv4 DHCPクライアントを列挙する。

DLLDHCPSAPI.dll呼出規約winapi対応OSwindowsserver2012

シグネチャ

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

DWORD DhcpV4EnumSubnetClients(
    LPCWSTR ServerIpAddress,   // optional
    DWORD SubnetAddress,
    DWORD* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_CLIENT_INFO_PB_ARRAY** ClientInfo,
    DWORD* ClientsRead,
    DWORD* ClientsTotal
);

パラメーター

名前	型	方向	説明
ServerIpAddress	LPCWSTR	inoptional	対象DHCPサーバーのIPアドレスを示すUnicode文字列。ローカルならNULL可。
SubnetAddress	DWORD	in	クライアントを列挙する対象サブネットのIPアドレス(DWORD)。
ResumeHandle	DWORD*	inout	列挙の再開位置ハンドルへのポインタ。初回は0を指す変数を渡す。
PreferredMaximum	DWORD	in	1回で返すクライアントデータの推奨最大バイト数。
ClientInfo	DHCP_CLIENT_INFO_PB_ARRAY**	out	列挙結果のクライアント情報DHCP_CLIENT_INFO_PB_ARRAYへのポインタを受け取る二重ポインタ。使用後は解放する。
ClientsRead	DWORD*	out	今回読み取られたクライアント数を受け取るDWORDへのポインタ。
ClientsTotal	DWORD*	out	残りのクライアント総数を受け取るDWORDへのポインタ。

戻り値の型: DWORD

各言語での呼び出し定義

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

DWORD DhcpV4EnumSubnetClients(
    LPCWSTR ServerIpAddress,   // optional
    DWORD SubnetAddress,
    DWORD* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_CLIENT_INFO_PB_ARRAY** ClientInfo,
    DWORD* ClientsRead,
    DWORD* ClientsTotal
);

[DllImport("DHCPSAPI.dll", ExactSpelling = true)]
static extern uint DhcpV4EnumSubnetClients(
    [MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress,   // LPCWSTR optional
    uint SubnetAddress,   // DWORD
    ref uint ResumeHandle,   // DWORD* in/out
    uint PreferredMaximum,   // DWORD
    IntPtr ClientInfo,   // DHCP_CLIENT_INFO_PB_ARRAY** out
    out uint ClientsRead,   // DWORD* out
    out uint ClientsTotal   // DWORD* out
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV4EnumSubnetClients(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPCWSTR optional
    SubnetAddress As UInteger,   ' DWORD
    ByRef ResumeHandle As UInteger,   ' DWORD* in/out
    PreferredMaximum As UInteger,   ' DWORD
    ClientInfo As IntPtr,   ' DHCP_CLIENT_INFO_PB_ARRAY** out
    <Out> ByRef ClientsRead As UInteger,   ' DWORD* out
    <Out> ByRef ClientsTotal As UInteger   ' DWORD* out
) As UInteger
End Function

' ServerIpAddress : LPCWSTR optional
' SubnetAddress : DWORD
' ResumeHandle : DWORD* in/out
' PreferredMaximum : DWORD
' ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out
' ClientsRead : DWORD* out
' ClientsTotal : DWORD* out
Declare PtrSafe Function DhcpV4EnumSubnetClients Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal SubnetAddress As Long, _
    ByRef ResumeHandle As Long, _
    ByVal PreferredMaximum As Long, _
    ByVal ClientInfo As LongPtr, _
    ByRef ClientsRead As Long, _
    ByRef ClientsTotal 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

DhcpV4EnumSubnetClients = ctypes.windll.dhcpsapi.DhcpV4EnumSubnetClients
DhcpV4EnumSubnetClients.restype = wintypes.DWORD
DhcpV4EnumSubnetClients.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPCWSTR optional
    wintypes.DWORD,  # SubnetAddress : DWORD
    ctypes.POINTER(wintypes.DWORD),  # ResumeHandle : DWORD* in/out
    wintypes.DWORD,  # PreferredMaximum : DWORD
    ctypes.c_void_p,  # ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out
    ctypes.POINTER(wintypes.DWORD),  # ClientsRead : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # ClientsTotal : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV4EnumSubnetClients = Fiddle::Function.new(
  lib['DhcpV4EnumSubnetClients'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPCWSTR optional
    -Fiddle::TYPE_INT,  # SubnetAddress : DWORD
    Fiddle::TYPE_VOIDP,  # ResumeHandle : DWORD* in/out
    -Fiddle::TYPE_INT,  # PreferredMaximum : DWORD
    Fiddle::TYPE_VOIDP,  # ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out
    Fiddle::TYPE_VOIDP,  # ClientsRead : DWORD* out
    Fiddle::TYPE_VOIDP,  # ClientsTotal : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV4EnumSubnetClients(
        ServerIpAddress: *const u16,  // LPCWSTR optional
        SubnetAddress: u32,  // DWORD
        ResumeHandle: *mut u32,  // DWORD* in/out
        PreferredMaximum: u32,  // DWORD
        ClientInfo: *mut *mut DHCP_CLIENT_INFO_PB_ARRAY,  // DHCP_CLIENT_INFO_PB_ARRAY** out
        ClientsRead: *mut u32,  // DWORD* out
        ClientsTotal: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV4EnumSubnetClients([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, uint SubnetAddress, ref uint ResumeHandle, uint PreferredMaximum, IntPtr ClientInfo, out uint ClientsRead, out uint ClientsTotal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV4EnumSubnetClients' -Namespace Win32 -PassThru
# $api::DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)

#uselib "DHCPSAPI.dll"
#func global DhcpV4EnumSubnetClients "DhcpV4EnumSubnetClients" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; DhcpV4EnumSubnetClients ServerIpAddress, SubnetAddress, varptr(ResumeHandle), PreferredMaximum, varptr(ClientInfo), varptr(ClientsRead), varptr(ClientsTotal)   ; 戻り値は stat
; ServerIpAddress : LPCWSTR optional -> "sptr"
; SubnetAddress : DWORD -> "sptr"
; ResumeHandle : DWORD* in/out -> "sptr"
; PreferredMaximum : DWORD -> "sptr"
; ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> "sptr"
; ClientsRead : DWORD* out -> "sptr"
; ClientsTotal : DWORD* 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。

出力引数:

#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4EnumSubnetClients "DhcpV4EnumSubnetClients" wstr, int, var, int, var, var, var
; res = DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> "var"
; ClientsRead : DWORD* out -> "var"
; ClientsTotal : DWORD* 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。#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4EnumSubnetClients "DhcpV4EnumSubnetClients" wstr, int, sptr, int, sptr, sptr, sptr
; res = DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, varptr(ResumeHandle), PreferredMaximum, varptr(ClientInfo), varptr(ClientsRead), varptr(ClientsTotal))
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "sptr"
; PreferredMaximum : DWORD -> "int"
; ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> "sptr"
; ClientsRead : DWORD* out -> "sptr"
; ClientsTotal : DWORD* out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; DWORD DhcpV4EnumSubnetClients(LPCWSTR ServerIpAddress, DWORD SubnetAddress, DWORD* ResumeHandle, DWORD PreferredMaximum, DHCP_CLIENT_INFO_PB_ARRAY** ClientInfo, DWORD* ClientsRead, DWORD* ClientsTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4EnumSubnetClients "DhcpV4EnumSubnetClients" wstr, int, var, int, var, var, var
; res = DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> "var"
; ClientsRead : DWORD* out -> "var"
; ClientsTotal : DWORD* 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 DhcpV4EnumSubnetClients(LPCWSTR ServerIpAddress, DWORD SubnetAddress, DWORD* ResumeHandle, DWORD PreferredMaximum, DHCP_CLIENT_INFO_PB_ARRAY** ClientInfo, DWORD* ClientsRead, DWORD* ClientsTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4EnumSubnetClients "DhcpV4EnumSubnetClients" wstr, int, intptr, int, intptr, intptr, intptr
; res = DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, varptr(ResumeHandle), PreferredMaximum, varptr(ClientInfo), varptr(ClientsRead), varptr(ClientsTotal))
; ServerIpAddress : LPCWSTR optional -> "wstr"
; SubnetAddress : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "intptr"
; PreferredMaximum : DWORD -> "int"
; ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> "intptr"
; ClientsRead : DWORD* out -> "intptr"
; ClientsTotal : DWORD* out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	dhcpsapi = windows.NewLazySystemDLL("DHCPSAPI.dll")
	procDhcpV4EnumSubnetClients = dhcpsapi.NewProc("DhcpV4EnumSubnetClients")
)

// ServerIpAddress (LPCWSTR optional), SubnetAddress (DWORD), ResumeHandle (DWORD* in/out), PreferredMaximum (DWORD), ClientInfo (DHCP_CLIENT_INFO_PB_ARRAY** out), ClientsRead (DWORD* out), ClientsTotal (DWORD* out)
r1, _, err := procDhcpV4EnumSubnetClients.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(SubnetAddress),
	uintptr(ResumeHandle),
	uintptr(PreferredMaximum),
	uintptr(ClientInfo),
	uintptr(ClientsRead),
	uintptr(ClientsTotal),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV4EnumSubnetClients(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  SubnetAddress: DWORD;   // DWORD
  ResumeHandle: Pointer;   // DWORD* in/out
  PreferredMaximum: DWORD;   // DWORD
  ClientInfo: Pointer;   // DHCP_CLIENT_INFO_PB_ARRAY** out
  ClientsRead: Pointer;   // DWORD* out
  ClientsTotal: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4EnumSubnetClients';

result := DllCall("DHCPSAPI\DhcpV4EnumSubnetClients"
    , "WStr", ServerIpAddress   ; LPCWSTR optional
    , "UInt", SubnetAddress   ; DWORD
    , "Ptr", ResumeHandle   ; DWORD* in/out
    , "UInt", PreferredMaximum   ; DWORD
    , "Ptr", ClientInfo   ; DHCP_CLIENT_INFO_PB_ARRAY** out
    , "Ptr", ClientsRead   ; DWORD* out
    , "Ptr", ClientsTotal   ; DWORD* out
    , "UInt")   ; return: DWORD

●DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal) = DLL("DHCPSAPI.dll", "dword DhcpV4EnumSubnetClients(char*, dword, void*, dword, void*, void*, void*)")
# 呼び出し: DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)
# ServerIpAddress : LPCWSTR optional -> "char*"
# SubnetAddress : DWORD -> "dword"
# ResumeHandle : DWORD* in/out -> "void*"
# PreferredMaximum : DWORD -> "dword"
# ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> "void*"
# ClientsRead : DWORD* out -> "void*"
# ClientsTotal : DWORD* 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 DhcpV4EnumSubnetClients(
    ServerIpAddress: [*c]const u16, // LPCWSTR optional
    SubnetAddress: u32, // DWORD
    ResumeHandle: [*c]u32, // DWORD* in/out
    PreferredMaximum: u32, // DWORD
    ClientInfo: [*c][*c]DHCP_CLIENT_INFO_PB_ARRAY, // DHCP_CLIENT_INFO_PB_ARRAY** out
    ClientsRead: [*c]u32, // DWORD* out
    ClientsTotal: [*c]u32 // DWORD* out
) callconv(std.os.windows.WINAPI) u32;

proc DhcpV4EnumSubnetClients(
    ServerIpAddress: WideCString,  # LPCWSTR optional
    SubnetAddress: uint32,  # DWORD
    ResumeHandle: ptr uint32,  # DWORD* in/out
    PreferredMaximum: uint32,  # DWORD
    ClientInfo: ptr DHCP_CLIENT_INFO_PB_ARRAY,  # DHCP_CLIENT_INFO_PB_ARRAY** out
    ClientsRead: ptr uint32,  # DWORD* out
    ClientsTotal: ptr uint32  # DWORD* out
): uint32 {.importc: "DhcpV4EnumSubnetClients", stdcall, dynlib: "DHCPSAPI.dll".}

pragma(lib, "dhcpsapi");
extern(Windows)
uint DhcpV4EnumSubnetClients(
    const(wchar)* ServerIpAddress,   // LPCWSTR optional
    uint SubnetAddress,   // DWORD
    uint* ResumeHandle,   // DWORD* in/out
    uint PreferredMaximum,   // DWORD
    DHCP_CLIENT_INFO_PB_ARRAY** ClientInfo,   // DHCP_CLIENT_INFO_PB_ARRAY** out
    uint* ClientsRead,   // DWORD* out
    uint* ClientsTotal   // DWORD* out
);

ccall((:DhcpV4EnumSubnetClients, "DHCPSAPI.dll"), stdcall, UInt32,
      (Cwstring, UInt32, Ptr{UInt32}, UInt32, Ptr{DHCP_CLIENT_INFO_PB_ARRAY}, Ptr{UInt32}, Ptr{UInt32}),
      ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)
# ServerIpAddress : LPCWSTR optional -> Cwstring
# SubnetAddress : DWORD -> UInt32
# ResumeHandle : DWORD* in/out -> Ptr{UInt32}
# PreferredMaximum : DWORD -> UInt32
# ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> Ptr{DHCP_CLIENT_INFO_PB_ARRAY}
# ClientsRead : DWORD* out -> Ptr{UInt32}
# ClientsTotal : DWORD* out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t DhcpV4EnumSubnetClients(
    const uint16_t* ServerIpAddress,
    uint32_t SubnetAddress,
    uint32_t* ResumeHandle,
    uint32_t PreferredMaximum,
    void* ClientInfo,
    uint32_t* ClientsRead,
    uint32_t* ClientsTotal);
]]
local dhcpsapi = ffi.load("dhcpsapi")
-- dhcpsapi.DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)
-- ServerIpAddress : LPCWSTR optional
-- SubnetAddress : DWORD
-- ResumeHandle : DWORD* in/out
-- PreferredMaximum : DWORD
-- ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out
-- ClientsRead : DWORD* out
-- ClientsTotal : DWORD* 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 DhcpV4EnumSubnetClients = lib.func('__stdcall', 'DhcpV4EnumSubnetClients', 'uint32_t', ['str16', 'uint32_t', 'uint32_t *', 'uint32_t', 'void *', 'uint32_t *', 'uint32_t *']);
// DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)
// ServerIpAddress : LPCWSTR optional -> 'str16'
// SubnetAddress : DWORD -> 'uint32_t'
// ResumeHandle : DWORD* in/out -> 'uint32_t *'
// PreferredMaximum : DWORD -> 'uint32_t'
// ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> 'void *'
// ClientsRead : DWORD* out -> 'uint32_t *'
// ClientsTotal : DWORD* out -> 'uint32_t *'
// 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", {
  DhcpV4EnumSubnetClients: { parameters: ["buffer", "u32", "pointer", "u32", "pointer", "pointer", "pointer"], result: "u32" },
});
// lib.symbols.DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal)
// ServerIpAddress : LPCWSTR optional -> "buffer"
// SubnetAddress : DWORD -> "u32"
// ResumeHandle : DWORD* in/out -> "pointer"
// PreferredMaximum : DWORD -> "u32"
// ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> "pointer"
// ClientsRead : DWORD* out -> "pointer"
// ClientsTotal : DWORD* 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 DhcpV4EnumSubnetClients(
    const uint16_t* ServerIpAddress,
    uint32_t SubnetAddress,
    uint32_t* ResumeHandle,
    uint32_t PreferredMaximum,
    void* ClientInfo,
    uint32_t* ClientsRead,
    uint32_t* ClientsTotal);
C, "DHCPSAPI.dll");
// $ffi->DhcpV4EnumSubnetClients(ServerIpAddress, SubnetAddress, ResumeHandle, PreferredMaximum, ClientInfo, ClientsRead, ClientsTotal);
// ServerIpAddress : LPCWSTR optional
// SubnetAddress : DWORD
// ResumeHandle : DWORD* in/out
// PreferredMaximum : DWORD
// ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out
// ClientsRead : DWORD* out
// ClientsTotal : DWORD* 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 DhcpV4EnumSubnetClients(
        WString ServerIpAddress,   // LPCWSTR optional
        int SubnetAddress,   // DWORD
        IntByReference ResumeHandle,   // DWORD* in/out
        int PreferredMaximum,   // DWORD
        Pointer ClientInfo,   // DHCP_CLIENT_INFO_PB_ARRAY** out
        IntByReference ClientsRead,   // DWORD* out
        IntByReference ClientsTotal   // DWORD* out
    );
}

@[Link("dhcpsapi")]
lib LibDHCPSAPI
  fun DhcpV4EnumSubnetClients = DhcpV4EnumSubnetClients(
    ServerIpAddress : UInt16*,   # LPCWSTR optional
    SubnetAddress : UInt32,   # DWORD
    ResumeHandle : UInt32*,   # DWORD* in/out
    PreferredMaximum : UInt32,   # DWORD
    ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY**,   # DHCP_CLIENT_INFO_PB_ARRAY** out
    ClientsRead : UInt32*,   # DWORD* out
    ClientsTotal : UInt32*   # DWORD* 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 DhcpV4EnumSubnetClientsNative = Uint32 Function(Pointer<Utf16>, Uint32, Pointer<Uint32>, Uint32, Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>);
typedef DhcpV4EnumSubnetClientsDart = int Function(Pointer<Utf16>, int, Pointer<Uint32>, int, Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>);
final DhcpV4EnumSubnetClients = DynamicLibrary.open('DHCPSAPI.dll')
    .lookupFunction<DhcpV4EnumSubnetClientsNative, DhcpV4EnumSubnetClientsDart>('DhcpV4EnumSubnetClients');
// ServerIpAddress : LPCWSTR optional -> Pointer<Utf16>
// SubnetAddress : DWORD -> Uint32
// ResumeHandle : DWORD* in/out -> Pointer<Uint32>
// PreferredMaximum : DWORD -> Uint32
// ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> Pointer<Void>
// ClientsRead : DWORD* out -> Pointer<Uint32>
// ClientsTotal : DWORD* out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function DhcpV4EnumSubnetClients(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  SubnetAddress: DWORD;   // DWORD
  ResumeHandle: Pointer;   // DWORD* in/out
  PreferredMaximum: DWORD;   // DWORD
  ClientInfo: Pointer;   // DHCP_CLIENT_INFO_PB_ARRAY** out
  ClientsRead: Pointer;   // DWORD* out
  ClientsTotal: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4EnumSubnetClients';

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

foreign import stdcall safe "DhcpV4EnumSubnetClients"
  c_DhcpV4EnumSubnetClients :: CWString -> Word32 -> Ptr Word32 -> Word32 -> Ptr () -> Ptr Word32 -> Ptr Word32 -> IO Word32
-- ServerIpAddress : LPCWSTR optional -> CWString
-- SubnetAddress : DWORD -> Word32
-- ResumeHandle : DWORD* in/out -> Ptr Word32
-- PreferredMaximum : DWORD -> Word32
-- ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> Ptr ()
-- ClientsRead : DWORD* out -> Ptr Word32
-- ClientsTotal : DWORD* out -> Ptr Word32
-- 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 dhcpv4enumsubnetclients =
  foreign "DhcpV4EnumSubnetClients"
    ((ptr uint16_t) @-> uint32_t @-> (ptr uint32_t) @-> uint32_t @-> (ptr void) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> returning uint32_t)
(* ServerIpAddress : LPCWSTR optional -> (ptr uint16_t) *)
(* SubnetAddress : DWORD -> uint32_t *)
(* ResumeHandle : DWORD* in/out -> (ptr uint32_t) *)
(* PreferredMaximum : DWORD -> uint32_t *)
(* ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> (ptr void) *)
(* ClientsRead : DWORD* out -> (ptr uint32_t) *)
(* ClientsTotal : DWORD* out -> (ptr uint32_t) *)
(* 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 ("DhcpV4EnumSubnetClients" dhcp-v4-enum-subnet-clients :convention :stdcall) :uint32
  (server-ip-address (:string :encoding :utf-16le))   ; LPCWSTR optional
  (subnet-address :uint32)   ; DWORD
  (resume-handle :pointer)   ; DWORD* in/out
  (preferred-maximum :uint32)   ; DWORD
  (client-info :pointer)   ; DHCP_CLIENT_INFO_PB_ARRAY** out
  (clients-read :pointer)   ; DWORD* out
  (clients-total :pointer))   ; DWORD* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $DhcpV4EnumSubnetClients = Win32::API::More->new('DHCPSAPI',
    'DWORD DhcpV4EnumSubnetClients(LPCWSTR ServerIpAddress, DWORD SubnetAddress, LPVOID ResumeHandle, DWORD PreferredMaximum, LPVOID ClientInfo, LPVOID ClientsRead, LPVOID ClientsTotal)');
# my $ret = $DhcpV4EnumSubnetClients->Call($ServerIpAddress, $SubnetAddress, $ResumeHandle, $PreferredMaximum, $ClientInfo, $ClientsRead, $ClientsTotal);
# ServerIpAddress : LPCWSTR optional -> LPCWSTR
# SubnetAddress : DWORD -> DWORD
# ResumeHandle : DWORD* in/out -> LPVOID
# PreferredMaximum : DWORD -> DWORD
# ClientInfo : DHCP_CLIENT_INFO_PB_ARRAY** out -> LPVOID
# ClientsRead : DWORD* out -> LPVOID
# ClientsTotal : DWORD* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

DhcpV4EnumSubnetClients

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