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DhcpEnumFilterV4

関数

DHCPv4サーバーの許可/拒否フィルター一覧を列挙する。

DLLDHCPSAPI.dll呼出規約winapi対応OSwindowsserver2008

シグネチャ

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

DWORD DhcpEnumFilterV4(
    LPCWSTR ServerIpAddress,   // optional
    DHCP_ADDR_PATTERN* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_FILTER_LIST_TYPE ListType,
    DHCP_FILTER_ENUM_INFO** EnumFilterInfo,
    DWORD* ElementsRead,
    DWORD* ElementsTotal
);

パラメーター

名前	型	方向	説明
ServerIpAddress	LPCWSTR	inoptional	操作対象DHCPサーバのIPアドレスまたはホスト名(Unicode)。
ResumeHandle	DHCP_ADDR_PATTERN*	inout	列挙の再開位置を示すDHCP_ADDR_PATTERN構造体へのポインタ。初回はNULL相当。
PreferredMaximum	DWORD	in	一度に取得するフィルタ数の上限をバイト数で指定する。
ListType	DHCP_FILTER_LIST_TYPE	in	列挙対象が許可リストか拒否リストかを示すDHCP_FILTER_LIST_TYPE値。
EnumFilterInfo	DHCP_FILTER_ENUM_INFO**	out	列挙結果を受け取るDHCP_FILTER_ENUM_INFO配列へのポインタ。
ElementsRead	DWORD*	out	今回読み取ったフィルタ数を受け取るDWORDへのポインタ。
ElementsTotal	DWORD*	out	未列挙分も含む残りフィルタ総数を受け取る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 DhcpEnumFilterV4(
    LPCWSTR ServerIpAddress,   // optional
    DHCP_ADDR_PATTERN* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_FILTER_LIST_TYPE ListType,
    DHCP_FILTER_ENUM_INFO** EnumFilterInfo,
    DWORD* ElementsRead,
    DWORD* ElementsTotal
);

[DllImport("DHCPSAPI.dll", ExactSpelling = true)]
static extern uint DhcpEnumFilterV4(
    [MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress,   // LPCWSTR optional
    IntPtr ResumeHandle,   // DHCP_ADDR_PATTERN* in/out
    uint PreferredMaximum,   // DWORD
    int ListType,   // DHCP_FILTER_LIST_TYPE
    IntPtr EnumFilterInfo,   // DHCP_FILTER_ENUM_INFO** out
    out uint ElementsRead,   // DWORD* out
    out uint ElementsTotal   // DWORD* out
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpEnumFilterV4(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPCWSTR optional
    ResumeHandle As IntPtr,   ' DHCP_ADDR_PATTERN* in/out
    PreferredMaximum As UInteger,   ' DWORD
    ListType As Integer,   ' DHCP_FILTER_LIST_TYPE
    EnumFilterInfo As IntPtr,   ' DHCP_FILTER_ENUM_INFO** out
    <Out> ByRef ElementsRead As UInteger,   ' DWORD* out
    <Out> ByRef ElementsTotal As UInteger   ' DWORD* out
) As UInteger
End Function

' ServerIpAddress : LPCWSTR optional
' ResumeHandle : DHCP_ADDR_PATTERN* in/out
' PreferredMaximum : DWORD
' ListType : DHCP_FILTER_LIST_TYPE
' EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out
' ElementsRead : DWORD* out
' ElementsTotal : DWORD* out
Declare PtrSafe Function DhcpEnumFilterV4 Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal ResumeHandle As LongPtr, _
    ByVal PreferredMaximum As Long, _
    ByVal ListType As Long, _
    ByVal EnumFilterInfo As LongPtr, _
    ByRef ElementsRead As Long, _
    ByRef ElementsTotal 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

DhcpEnumFilterV4 = ctypes.windll.dhcpsapi.DhcpEnumFilterV4
DhcpEnumFilterV4.restype = wintypes.DWORD
DhcpEnumFilterV4.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPCWSTR optional
    ctypes.c_void_p,  # ResumeHandle : DHCP_ADDR_PATTERN* in/out
    wintypes.DWORD,  # PreferredMaximum : DWORD
    ctypes.c_int,  # ListType : DHCP_FILTER_LIST_TYPE
    ctypes.c_void_p,  # EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out
    ctypes.POINTER(wintypes.DWORD),  # ElementsRead : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # ElementsTotal : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpEnumFilterV4 = Fiddle::Function.new(
  lib['DhcpEnumFilterV4'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # ResumeHandle : DHCP_ADDR_PATTERN* in/out
    -Fiddle::TYPE_INT,  # PreferredMaximum : DWORD
    Fiddle::TYPE_INT,  # ListType : DHCP_FILTER_LIST_TYPE
    Fiddle::TYPE_VOIDP,  # EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out
    Fiddle::TYPE_VOIDP,  # ElementsRead : DWORD* out
    Fiddle::TYPE_VOIDP,  # ElementsTotal : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpEnumFilterV4(
        ServerIpAddress: *const u16,  // LPCWSTR optional
        ResumeHandle: *mut DHCP_ADDR_PATTERN,  // DHCP_ADDR_PATTERN* in/out
        PreferredMaximum: u32,  // DWORD
        ListType: i32,  // DHCP_FILTER_LIST_TYPE
        EnumFilterInfo: *mut *mut DHCP_FILTER_ENUM_INFO,  // DHCP_FILTER_ENUM_INFO** out
        ElementsRead: *mut u32,  // DWORD* out
        ElementsTotal: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpEnumFilterV4([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, IntPtr ResumeHandle, uint PreferredMaximum, int ListType, IntPtr EnumFilterInfo, out uint ElementsRead, out uint ElementsTotal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpEnumFilterV4' -Namespace Win32 -PassThru
# $api::DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)

#uselib "DHCPSAPI.dll"
#func global DhcpEnumFilterV4 "DhcpEnumFilterV4" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; DhcpEnumFilterV4 ServerIpAddress, varptr(ResumeHandle), PreferredMaximum, ListType, varptr(EnumFilterInfo), varptr(ElementsRead), varptr(ElementsTotal)   ; 戻り値は stat
; ServerIpAddress : LPCWSTR optional -> "sptr"
; ResumeHandle : DHCP_ADDR_PATTERN* in/out -> "sptr"
; PreferredMaximum : DWORD -> "sptr"
; ListType : DHCP_FILTER_LIST_TYPE -> "sptr"
; EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> "sptr"
; ElementsRead : DWORD* out -> "sptr"
; ElementsTotal : 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 DhcpEnumFilterV4 "DhcpEnumFilterV4" wstr, var, int, int, var, var, var
; res = DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ResumeHandle : DHCP_ADDR_PATTERN* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; ListType : DHCP_FILTER_LIST_TYPE -> "int"
; EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> "var"
; ElementsRead : DWORD* out -> "var"
; ElementsTotal : 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 DhcpEnumFilterV4 "DhcpEnumFilterV4" wstr, sptr, int, int, sptr, sptr, sptr
; res = DhcpEnumFilterV4(ServerIpAddress, varptr(ResumeHandle), PreferredMaximum, ListType, varptr(EnumFilterInfo), varptr(ElementsRead), varptr(ElementsTotal))
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ResumeHandle : DHCP_ADDR_PATTERN* in/out -> "sptr"
; PreferredMaximum : DWORD -> "int"
; ListType : DHCP_FILTER_LIST_TYPE -> "int"
; EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> "sptr"
; ElementsRead : DWORD* out -> "sptr"
; ElementsTotal : 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 DhcpEnumFilterV4(LPCWSTR ServerIpAddress, DHCP_ADDR_PATTERN* ResumeHandle, DWORD PreferredMaximum, DHCP_FILTER_LIST_TYPE ListType, DHCP_FILTER_ENUM_INFO** EnumFilterInfo, DWORD* ElementsRead, DWORD* ElementsTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpEnumFilterV4 "DhcpEnumFilterV4" wstr, var, int, int, var, var, var
; res = DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ResumeHandle : DHCP_ADDR_PATTERN* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; ListType : DHCP_FILTER_LIST_TYPE -> "int"
; EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> "var"
; ElementsRead : DWORD* out -> "var"
; ElementsTotal : 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 DhcpEnumFilterV4(LPCWSTR ServerIpAddress, DHCP_ADDR_PATTERN* ResumeHandle, DWORD PreferredMaximum, DHCP_FILTER_LIST_TYPE ListType, DHCP_FILTER_ENUM_INFO** EnumFilterInfo, DWORD* ElementsRead, DWORD* ElementsTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpEnumFilterV4 "DhcpEnumFilterV4" wstr, intptr, int, int, intptr, intptr, intptr
; res = DhcpEnumFilterV4(ServerIpAddress, varptr(ResumeHandle), PreferredMaximum, ListType, varptr(EnumFilterInfo), varptr(ElementsRead), varptr(ElementsTotal))
; ServerIpAddress : LPCWSTR optional -> "wstr"
; ResumeHandle : DHCP_ADDR_PATTERN* in/out -> "intptr"
; PreferredMaximum : DWORD -> "int"
; ListType : DHCP_FILTER_LIST_TYPE -> "int"
; EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> "intptr"
; ElementsRead : DWORD* out -> "intptr"
; ElementsTotal : 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")
	procDhcpEnumFilterV4 = dhcpsapi.NewProc("DhcpEnumFilterV4")
)

// ServerIpAddress (LPCWSTR optional), ResumeHandle (DHCP_ADDR_PATTERN* in/out), PreferredMaximum (DWORD), ListType (DHCP_FILTER_LIST_TYPE), EnumFilterInfo (DHCP_FILTER_ENUM_INFO** out), ElementsRead (DWORD* out), ElementsTotal (DWORD* out)
r1, _, err := procDhcpEnumFilterV4.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(ResumeHandle),
	uintptr(PreferredMaximum),
	uintptr(ListType),
	uintptr(EnumFilterInfo),
	uintptr(ElementsRead),
	uintptr(ElementsTotal),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpEnumFilterV4(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  ResumeHandle: Pointer;   // DHCP_ADDR_PATTERN* in/out
  PreferredMaximum: DWORD;   // DWORD
  ListType: Integer;   // DHCP_FILTER_LIST_TYPE
  EnumFilterInfo: Pointer;   // DHCP_FILTER_ENUM_INFO** out
  ElementsRead: Pointer;   // DWORD* out
  ElementsTotal: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpEnumFilterV4';

result := DllCall("DHCPSAPI\DhcpEnumFilterV4"
    , "WStr", ServerIpAddress   ; LPCWSTR optional
    , "Ptr", ResumeHandle   ; DHCP_ADDR_PATTERN* in/out
    , "UInt", PreferredMaximum   ; DWORD
    , "Int", ListType   ; DHCP_FILTER_LIST_TYPE
    , "Ptr", EnumFilterInfo   ; DHCP_FILTER_ENUM_INFO** out
    , "Ptr", ElementsRead   ; DWORD* out
    , "Ptr", ElementsTotal   ; DWORD* out
    , "UInt")   ; return: DWORD

●DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal) = DLL("DHCPSAPI.dll", "dword DhcpEnumFilterV4(char*, void*, dword, int, void*, void*, void*)")
# 呼び出し: DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)
# ServerIpAddress : LPCWSTR optional -> "char*"
# ResumeHandle : DHCP_ADDR_PATTERN* in/out -> "void*"
# PreferredMaximum : DWORD -> "dword"
# ListType : DHCP_FILTER_LIST_TYPE -> "int"
# EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> "void*"
# ElementsRead : DWORD* out -> "void*"
# ElementsTotal : 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 DhcpEnumFilterV4(
    ServerIpAddress: [*c]const u16, // LPCWSTR optional
    ResumeHandle: [*c]DHCP_ADDR_PATTERN, // DHCP_ADDR_PATTERN* in/out
    PreferredMaximum: u32, // DWORD
    ListType: i32, // DHCP_FILTER_LIST_TYPE
    EnumFilterInfo: [*c][*c]DHCP_FILTER_ENUM_INFO, // DHCP_FILTER_ENUM_INFO** out
    ElementsRead: [*c]u32, // DWORD* out
    ElementsTotal: [*c]u32 // DWORD* out
) callconv(std.os.windows.WINAPI) u32;

proc DhcpEnumFilterV4(
    ServerIpAddress: WideCString,  # LPCWSTR optional
    ResumeHandle: ptr DHCP_ADDR_PATTERN,  # DHCP_ADDR_PATTERN* in/out
    PreferredMaximum: uint32,  # DWORD
    ListType: int32,  # DHCP_FILTER_LIST_TYPE
    EnumFilterInfo: ptr DHCP_FILTER_ENUM_INFO,  # DHCP_FILTER_ENUM_INFO** out
    ElementsRead: ptr uint32,  # DWORD* out
    ElementsTotal: ptr uint32  # DWORD* out
): uint32 {.importc: "DhcpEnumFilterV4", stdcall, dynlib: "DHCPSAPI.dll".}

pragma(lib, "dhcpsapi");
extern(Windows)
uint DhcpEnumFilterV4(
    const(wchar)* ServerIpAddress,   // LPCWSTR optional
    DHCP_ADDR_PATTERN* ResumeHandle,   // DHCP_ADDR_PATTERN* in/out
    uint PreferredMaximum,   // DWORD
    int ListType,   // DHCP_FILTER_LIST_TYPE
    DHCP_FILTER_ENUM_INFO** EnumFilterInfo,   // DHCP_FILTER_ENUM_INFO** out
    uint* ElementsRead,   // DWORD* out
    uint* ElementsTotal   // DWORD* out
);

ccall((:DhcpEnumFilterV4, "DHCPSAPI.dll"), stdcall, UInt32,
      (Cwstring, Ptr{DHCP_ADDR_PATTERN}, UInt32, Int32, Ptr{DHCP_FILTER_ENUM_INFO}, Ptr{UInt32}, Ptr{UInt32}),
      ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)
# ServerIpAddress : LPCWSTR optional -> Cwstring
# ResumeHandle : DHCP_ADDR_PATTERN* in/out -> Ptr{DHCP_ADDR_PATTERN}
# PreferredMaximum : DWORD -> UInt32
# ListType : DHCP_FILTER_LIST_TYPE -> Int32
# EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> Ptr{DHCP_FILTER_ENUM_INFO}
# ElementsRead : DWORD* out -> Ptr{UInt32}
# ElementsTotal : 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 DhcpEnumFilterV4(
    const uint16_t* ServerIpAddress,
    void* ResumeHandle,
    uint32_t PreferredMaximum,
    int32_t ListType,
    void* EnumFilterInfo,
    uint32_t* ElementsRead,
    uint32_t* ElementsTotal);
]]
local dhcpsapi = ffi.load("dhcpsapi")
-- dhcpsapi.DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)
-- ServerIpAddress : LPCWSTR optional
-- ResumeHandle : DHCP_ADDR_PATTERN* in/out
-- PreferredMaximum : DWORD
-- ListType : DHCP_FILTER_LIST_TYPE
-- EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out
-- ElementsRead : DWORD* out
-- ElementsTotal : 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 DhcpEnumFilterV4 = lib.func('__stdcall', 'DhcpEnumFilterV4', 'uint32_t', ['str16', 'void *', 'uint32_t', 'int32_t', 'void *', 'uint32_t *', 'uint32_t *']);
// DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)
// ServerIpAddress : LPCWSTR optional -> 'str16'
// ResumeHandle : DHCP_ADDR_PATTERN* in/out -> 'void *'
// PreferredMaximum : DWORD -> 'uint32_t'
// ListType : DHCP_FILTER_LIST_TYPE -> 'int32_t'
// EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> 'void *'
// ElementsRead : DWORD* out -> 'uint32_t *'
// ElementsTotal : 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", {
  DhcpEnumFilterV4: { parameters: ["buffer", "pointer", "u32", "i32", "pointer", "pointer", "pointer"], result: "u32" },
});
// lib.symbols.DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal)
// ServerIpAddress : LPCWSTR optional -> "buffer"
// ResumeHandle : DHCP_ADDR_PATTERN* in/out -> "pointer"
// PreferredMaximum : DWORD -> "u32"
// ListType : DHCP_FILTER_LIST_TYPE -> "i32"
// EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> "pointer"
// ElementsRead : DWORD* out -> "pointer"
// ElementsTotal : 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 DhcpEnumFilterV4(
    const uint16_t* ServerIpAddress,
    void* ResumeHandle,
    uint32_t PreferredMaximum,
    int32_t ListType,
    void* EnumFilterInfo,
    uint32_t* ElementsRead,
    uint32_t* ElementsTotal);
C, "DHCPSAPI.dll");
// $ffi->DhcpEnumFilterV4(ServerIpAddress, ResumeHandle, PreferredMaximum, ListType, EnumFilterInfo, ElementsRead, ElementsTotal);
// ServerIpAddress : LPCWSTR optional
// ResumeHandle : DHCP_ADDR_PATTERN* in/out
// PreferredMaximum : DWORD
// ListType : DHCP_FILTER_LIST_TYPE
// EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out
// ElementsRead : DWORD* out
// ElementsTotal : 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 DhcpEnumFilterV4(
        WString ServerIpAddress,   // LPCWSTR optional
        Pointer ResumeHandle,   // DHCP_ADDR_PATTERN* in/out
        int PreferredMaximum,   // DWORD
        int ListType,   // DHCP_FILTER_LIST_TYPE
        Pointer EnumFilterInfo,   // DHCP_FILTER_ENUM_INFO** out
        IntByReference ElementsRead,   // DWORD* out
        IntByReference ElementsTotal   // DWORD* out
    );
}

@[Link("dhcpsapi")]
lib LibDHCPSAPI
  fun DhcpEnumFilterV4 = DhcpEnumFilterV4(
    ServerIpAddress : UInt16*,   # LPCWSTR optional
    ResumeHandle : DHCP_ADDR_PATTERN*,   # DHCP_ADDR_PATTERN* in/out
    PreferredMaximum : UInt32,   # DWORD
    ListType : Int32,   # DHCP_FILTER_LIST_TYPE
    EnumFilterInfo : DHCP_FILTER_ENUM_INFO**,   # DHCP_FILTER_ENUM_INFO** out
    ElementsRead : UInt32*,   # DWORD* out
    ElementsTotal : 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 DhcpEnumFilterV4Native = Uint32 Function(Pointer<Utf16>, Pointer<Void>, Uint32, Int32, Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>);
typedef DhcpEnumFilterV4Dart = int Function(Pointer<Utf16>, Pointer<Void>, int, int, Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>);
final DhcpEnumFilterV4 = DynamicLibrary.open('DHCPSAPI.dll')
    .lookupFunction<DhcpEnumFilterV4Native, DhcpEnumFilterV4Dart>('DhcpEnumFilterV4');
// ServerIpAddress : LPCWSTR optional -> Pointer<Utf16>
// ResumeHandle : DHCP_ADDR_PATTERN* in/out -> Pointer<Void>
// PreferredMaximum : DWORD -> Uint32
// ListType : DHCP_FILTER_LIST_TYPE -> Int32
// EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> Pointer<Void>
// ElementsRead : DWORD* out -> Pointer<Uint32>
// ElementsTotal : DWORD* out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function DhcpEnumFilterV4(
  ServerIpAddress: PWideChar;   // LPCWSTR optional
  ResumeHandle: Pointer;   // DHCP_ADDR_PATTERN* in/out
  PreferredMaximum: DWORD;   // DWORD
  ListType: Integer;   // DHCP_FILTER_LIST_TYPE
  EnumFilterInfo: Pointer;   // DHCP_FILTER_ENUM_INFO** out
  ElementsRead: Pointer;   // DWORD* out
  ElementsTotal: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpEnumFilterV4';

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

foreign import stdcall safe "DhcpEnumFilterV4"
  c_DhcpEnumFilterV4 :: CWString -> Ptr () -> Word32 -> Int32 -> Ptr () -> Ptr Word32 -> Ptr Word32 -> IO Word32
-- ServerIpAddress : LPCWSTR optional -> CWString
-- ResumeHandle : DHCP_ADDR_PATTERN* in/out -> Ptr ()
-- PreferredMaximum : DWORD -> Word32
-- ListType : DHCP_FILTER_LIST_TYPE -> Int32
-- EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> Ptr ()
-- ElementsRead : DWORD* out -> Ptr Word32
-- ElementsTotal : 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 dhcpenumfilterv4 =
  foreign "DhcpEnumFilterV4"
    ((ptr uint16_t) @-> (ptr void) @-> uint32_t @-> int32_t @-> (ptr void) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> returning uint32_t)
(* ServerIpAddress : LPCWSTR optional -> (ptr uint16_t) *)
(* ResumeHandle : DHCP_ADDR_PATTERN* in/out -> (ptr void) *)
(* PreferredMaximum : DWORD -> uint32_t *)
(* ListType : DHCP_FILTER_LIST_TYPE -> int32_t *)
(* EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> (ptr void) *)
(* ElementsRead : DWORD* out -> (ptr uint32_t) *)
(* ElementsTotal : 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 ("DhcpEnumFilterV4" dhcp-enum-filter-v4 :convention :stdcall) :uint32
  (server-ip-address (:string :encoding :utf-16le))   ; LPCWSTR optional
  (resume-handle :pointer)   ; DHCP_ADDR_PATTERN* in/out
  (preferred-maximum :uint32)   ; DWORD
  (list-type :int32)   ; DHCP_FILTER_LIST_TYPE
  (enum-filter-info :pointer)   ; DHCP_FILTER_ENUM_INFO** out
  (elements-read :pointer)   ; DWORD* out
  (elements-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 $DhcpEnumFilterV4 = Win32::API::More->new('DHCPSAPI',
    'DWORD DhcpEnumFilterV4(LPCWSTR ServerIpAddress, LPVOID ResumeHandle, DWORD PreferredMaximum, int ListType, LPVOID EnumFilterInfo, LPVOID ElementsRead, LPVOID ElementsTotal)');
# my $ret = $DhcpEnumFilterV4->Call($ServerIpAddress, $ResumeHandle, $PreferredMaximum, $ListType, $EnumFilterInfo, $ElementsRead, $ElementsTotal);
# ServerIpAddress : LPCWSTR optional -> LPCWSTR
# ResumeHandle : DHCP_ADDR_PATTERN* in/out -> LPVOID
# PreferredMaximum : DWORD -> DWORD
# ListType : DHCP_FILTER_LIST_TYPE -> int
# EnumFilterInfo : DHCP_FILTER_ENUM_INFO** out -> LPVOID
# ElementsRead : DWORD* out -> LPVOID
# ElementsTotal : 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。

DhcpEnumFilterV4

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