ホーム › NetworkManagement.Dhcp › DhcpV4GetOptionValue

DhcpV4GetOptionValue

関数

指定スコープのIPv4 DHCPオプション値を取得する。

DLLDHCPSAPI.dll呼出規約winapi対応OSwindowsserver2012

シグネチャ

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

DWORD DhcpV4GetOptionValue(
    LPWSTR ServerIpAddress,   // optional
    DWORD Flags,
    DWORD OptionID,
    LPWSTR PolicyName,   // optional
    LPWSTR VendorName,   // optional
    DHCP_OPTION_SCOPE_INFO* ScopeInfo,
    DHCP_OPTION_VALUE** OptionValue
);

パラメーター

名前	型	方向	説明
ServerIpAddress	LPWSTR	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。
Flags	DWORD	in	ポリシー/ベンダー固有オプションか否かを示すフラグ。
OptionID	DWORD	in	値を取得するオプションの識別子(コード)。
PolicyName	LPWSTR	inoptional	オプション値が属するポリシー名。ポリシー単位でなければNULL可。
VendorName	LPWSTR	inoptional	ベンダー固有の場合のベンダー名。標準ならNULL可。
ScopeInfo	DHCP_OPTION_SCOPE_INFO*	inout	オプション値の適用範囲を示すDHCP_OPTION_SCOPE_INFO構造体へのポインタ。
OptionValue	DHCP_OPTION_VALUE**	inout	取得したオプション値のDHCP_OPTION_VALUE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。

戻り値の型: DWORD

各言語での呼び出し定義

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

DWORD DhcpV4GetOptionValue(
    LPWSTR ServerIpAddress,   // optional
    DWORD Flags,
    DWORD OptionID,
    LPWSTR PolicyName,   // optional
    LPWSTR VendorName,   // optional
    DHCP_OPTION_SCOPE_INFO* ScopeInfo,
    DHCP_OPTION_VALUE** OptionValue
);

[DllImport("DHCPSAPI.dll", ExactSpelling = true)]
static extern uint DhcpV4GetOptionValue(
    [MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress,   // LPWSTR optional
    uint Flags,   // DWORD
    uint OptionID,   // DWORD
    [MarshalAs(UnmanagedType.LPWStr)] string PolicyName,   // LPWSTR optional
    [MarshalAs(UnmanagedType.LPWStr)] string VendorName,   // LPWSTR optional
    IntPtr ScopeInfo,   // DHCP_OPTION_SCOPE_INFO* in/out
    IntPtr OptionValue   // DHCP_OPTION_VALUE** in/out
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV4GetOptionValue(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    Flags As UInteger,   ' DWORD
    OptionID As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> PolicyName As String,   ' LPWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> VendorName As String,   ' LPWSTR optional
    ScopeInfo As IntPtr,   ' DHCP_OPTION_SCOPE_INFO* in/out
    OptionValue As IntPtr   ' DHCP_OPTION_VALUE** in/out
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' Flags : DWORD
' OptionID : DWORD
' PolicyName : LPWSTR optional
' VendorName : LPWSTR optional
' ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out
' OptionValue : DHCP_OPTION_VALUE** in/out
Declare PtrSafe Function DhcpV4GetOptionValue Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal Flags As Long, _
    ByVal OptionID As Long, _
    ByVal PolicyName As LongPtr, _
    ByVal VendorName As LongPtr, _
    ByVal ScopeInfo As LongPtr, _
    ByVal OptionValue 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

DhcpV4GetOptionValue = ctypes.windll.dhcpsapi.DhcpV4GetOptionValue
DhcpV4GetOptionValue.restype = wintypes.DWORD
DhcpV4GetOptionValue.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    wintypes.DWORD,  # Flags : DWORD
    wintypes.DWORD,  # OptionID : DWORD
    wintypes.LPCWSTR,  # PolicyName : LPWSTR optional
    wintypes.LPCWSTR,  # VendorName : LPWSTR optional
    ctypes.c_void_p,  # ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out
    ctypes.c_void_p,  # OptionValue : DHCP_OPTION_VALUE** in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV4GetOptionValue = Fiddle::Function.new(
  lib['DhcpV4GetOptionValue'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    -Fiddle::TYPE_INT,  # Flags : DWORD
    -Fiddle::TYPE_INT,  # OptionID : DWORD
    Fiddle::TYPE_VOIDP,  # PolicyName : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # VendorName : LPWSTR optional
    Fiddle::TYPE_VOIDP,  # ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out
    Fiddle::TYPE_VOIDP,  # OptionValue : DHCP_OPTION_VALUE** in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV4GetOptionValue(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        Flags: u32,  // DWORD
        OptionID: u32,  // DWORD
        PolicyName: *mut u16,  // LPWSTR optional
        VendorName: *mut u16,  // LPWSTR optional
        ScopeInfo: *mut DHCP_OPTION_SCOPE_INFO,  // DHCP_OPTION_SCOPE_INFO* in/out
        OptionValue: *mut *mut DHCP_OPTION_VALUE  // DHCP_OPTION_VALUE** in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV4GetOptionValue([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, uint Flags, uint OptionID, [MarshalAs(UnmanagedType.LPWStr)] string PolicyName, [MarshalAs(UnmanagedType.LPWStr)] string VendorName, IntPtr ScopeInfo, IntPtr OptionValue);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV4GetOptionValue' -Namespace Win32 -PassThru
# $api::DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)

#uselib "DHCPSAPI.dll"
#func global DhcpV4GetOptionValue "DhcpV4GetOptionValue" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; DhcpV4GetOptionValue ServerIpAddress, Flags, OptionID, PolicyName, VendorName, varptr(ScopeInfo), varptr(OptionValue)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; Flags : DWORD -> "sptr"
; OptionID : DWORD -> "sptr"
; PolicyName : LPWSTR optional -> "sptr"
; VendorName : LPWSTR optional -> "sptr"
; ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> "sptr"
; OptionValue : DHCP_OPTION_VALUE** 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。

出力引数:

#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4GetOptionValue "DhcpV4GetOptionValue" wstr, int, int, wstr, wstr, var, var
; res = DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)
; ServerIpAddress : LPWSTR optional -> "wstr"
; Flags : DWORD -> "int"
; OptionID : DWORD -> "int"
; PolicyName : LPWSTR optional -> "wstr"
; VendorName : LPWSTR optional -> "wstr"
; ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> "var"
; OptionValue : DHCP_OPTION_VALUE** in/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 DhcpV4GetOptionValue "DhcpV4GetOptionValue" wstr, int, int, wstr, wstr, sptr, sptr
; res = DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, varptr(ScopeInfo), varptr(OptionValue))
; ServerIpAddress : LPWSTR optional -> "wstr"
; Flags : DWORD -> "int"
; OptionID : DWORD -> "int"
; PolicyName : LPWSTR optional -> "wstr"
; VendorName : LPWSTR optional -> "wstr"
; ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> "sptr"
; OptionValue : DHCP_OPTION_VALUE** in/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 DhcpV4GetOptionValue(LPWSTR ServerIpAddress, DWORD Flags, DWORD OptionID, LPWSTR PolicyName, LPWSTR VendorName, DHCP_OPTION_SCOPE_INFO* ScopeInfo, DHCP_OPTION_VALUE** OptionValue)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4GetOptionValue "DhcpV4GetOptionValue" wstr, int, int, wstr, wstr, var, var
; res = DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)
; ServerIpAddress : LPWSTR optional -> "wstr"
; Flags : DWORD -> "int"
; OptionID : DWORD -> "int"
; PolicyName : LPWSTR optional -> "wstr"
; VendorName : LPWSTR optional -> "wstr"
; ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> "var"
; OptionValue : DHCP_OPTION_VALUE** in/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 DhcpV4GetOptionValue(LPWSTR ServerIpAddress, DWORD Flags, DWORD OptionID, LPWSTR PolicyName, LPWSTR VendorName, DHCP_OPTION_SCOPE_INFO* ScopeInfo, DHCP_OPTION_VALUE** OptionValue)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpV4GetOptionValue "DhcpV4GetOptionValue" wstr, int, int, wstr, wstr, intptr, intptr
; res = DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, varptr(ScopeInfo), varptr(OptionValue))
; ServerIpAddress : LPWSTR optional -> "wstr"
; Flags : DWORD -> "int"
; OptionID : DWORD -> "int"
; PolicyName : LPWSTR optional -> "wstr"
; VendorName : LPWSTR optional -> "wstr"
; ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> "intptr"
; OptionValue : DHCP_OPTION_VALUE** in/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")
	procDhcpV4GetOptionValue = dhcpsapi.NewProc("DhcpV4GetOptionValue")
)

// ServerIpAddress (LPWSTR optional), Flags (DWORD), OptionID (DWORD), PolicyName (LPWSTR optional), VendorName (LPWSTR optional), ScopeInfo (DHCP_OPTION_SCOPE_INFO* in/out), OptionValue (DHCP_OPTION_VALUE** in/out)
r1, _, err := procDhcpV4GetOptionValue.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(Flags),
	uintptr(OptionID),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(PolicyName))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(VendorName))),
	uintptr(ScopeInfo),
	uintptr(OptionValue),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV4GetOptionValue(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  Flags: DWORD;   // DWORD
  OptionID: DWORD;   // DWORD
  PolicyName: PWideChar;   // LPWSTR optional
  VendorName: PWideChar;   // LPWSTR optional
  ScopeInfo: Pointer;   // DHCP_OPTION_SCOPE_INFO* in/out
  OptionValue: Pointer   // DHCP_OPTION_VALUE** in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4GetOptionValue';

result := DllCall("DHCPSAPI\DhcpV4GetOptionValue"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "UInt", Flags   ; DWORD
    , "UInt", OptionID   ; DWORD
    , "WStr", PolicyName   ; LPWSTR optional
    , "WStr", VendorName   ; LPWSTR optional
    , "Ptr", ScopeInfo   ; DHCP_OPTION_SCOPE_INFO* in/out
    , "Ptr", OptionValue   ; DHCP_OPTION_VALUE** in/out
    , "UInt")   ; return: DWORD

●DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue) = DLL("DHCPSAPI.dll", "dword DhcpV4GetOptionValue(char*, dword, dword, char*, char*, void*, void*)")
# 呼び出し: DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)
# ServerIpAddress : LPWSTR optional -> "char*"
# Flags : DWORD -> "dword"
# OptionID : DWORD -> "dword"
# PolicyName : LPWSTR optional -> "char*"
# VendorName : LPWSTR optional -> "char*"
# ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> "void*"
# OptionValue : DHCP_OPTION_VALUE** 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 DhcpV4GetOptionValue(
    ServerIpAddress: [*c]const u16, // LPWSTR optional
    Flags: u32, // DWORD
    OptionID: u32, // DWORD
    PolicyName: [*c]const u16, // LPWSTR optional
    VendorName: [*c]const u16, // LPWSTR optional
    ScopeInfo: [*c]DHCP_OPTION_SCOPE_INFO, // DHCP_OPTION_SCOPE_INFO* in/out
    OptionValue: [*c][*c]DHCP_OPTION_VALUE // DHCP_OPTION_VALUE** in/out
) callconv(std.os.windows.WINAPI) u32;

proc DhcpV4GetOptionValue(
    ServerIpAddress: WideCString,  # LPWSTR optional
    Flags: uint32,  # DWORD
    OptionID: uint32,  # DWORD
    PolicyName: WideCString,  # LPWSTR optional
    VendorName: WideCString,  # LPWSTR optional
    ScopeInfo: ptr DHCP_OPTION_SCOPE_INFO,  # DHCP_OPTION_SCOPE_INFO* in/out
    OptionValue: ptr DHCP_OPTION_VALUE  # DHCP_OPTION_VALUE** in/out
): uint32 {.importc: "DhcpV4GetOptionValue", stdcall, dynlib: "DHCPSAPI.dll".}

pragma(lib, "dhcpsapi");
extern(Windows)
uint DhcpV4GetOptionValue(
    const(wchar)* ServerIpAddress,   // LPWSTR optional
    uint Flags,   // DWORD
    uint OptionID,   // DWORD
    const(wchar)* PolicyName,   // LPWSTR optional
    const(wchar)* VendorName,   // LPWSTR optional
    DHCP_OPTION_SCOPE_INFO* ScopeInfo,   // DHCP_OPTION_SCOPE_INFO* in/out
    DHCP_OPTION_VALUE** OptionValue   // DHCP_OPTION_VALUE** in/out
);

ccall((:DhcpV4GetOptionValue, "DHCPSAPI.dll"), stdcall, UInt32,
      (Cwstring, UInt32, UInt32, Cwstring, Cwstring, Ptr{DHCP_OPTION_SCOPE_INFO}, Ptr{DHCP_OPTION_VALUE}),
      ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)
# ServerIpAddress : LPWSTR optional -> Cwstring
# Flags : DWORD -> UInt32
# OptionID : DWORD -> UInt32
# PolicyName : LPWSTR optional -> Cwstring
# VendorName : LPWSTR optional -> Cwstring
# ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> Ptr{DHCP_OPTION_SCOPE_INFO}
# OptionValue : DHCP_OPTION_VALUE** in/out -> Ptr{DHCP_OPTION_VALUE}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t DhcpV4GetOptionValue(
    const uint16_t* ServerIpAddress,
    uint32_t Flags,
    uint32_t OptionID,
    const uint16_t* PolicyName,
    const uint16_t* VendorName,
    void* ScopeInfo,
    void* OptionValue);
]]
local dhcpsapi = ffi.load("dhcpsapi")
-- dhcpsapi.DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)
-- ServerIpAddress : LPWSTR optional
-- Flags : DWORD
-- OptionID : DWORD
-- PolicyName : LPWSTR optional
-- VendorName : LPWSTR optional
-- ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out
-- OptionValue : DHCP_OPTION_VALUE** 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 DhcpV4GetOptionValue = lib.func('__stdcall', 'DhcpV4GetOptionValue', 'uint32_t', ['str16', 'uint32_t', 'uint32_t', 'str16', 'str16', 'void *', 'void *']);
// DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)
// ServerIpAddress : LPWSTR optional -> 'str16'
// Flags : DWORD -> 'uint32_t'
// OptionID : DWORD -> 'uint32_t'
// PolicyName : LPWSTR optional -> 'str16'
// VendorName : LPWSTR optional -> 'str16'
// ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> 'void *'
// OptionValue : DHCP_OPTION_VALUE** 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", {
  DhcpV4GetOptionValue: { parameters: ["buffer", "u32", "u32", "buffer", "buffer", "pointer", "pointer"], result: "u32" },
});
// lib.symbols.DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue)
// ServerIpAddress : LPWSTR optional -> "buffer"
// Flags : DWORD -> "u32"
// OptionID : DWORD -> "u32"
// PolicyName : LPWSTR optional -> "buffer"
// VendorName : LPWSTR optional -> "buffer"
// ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> "pointer"
// OptionValue : DHCP_OPTION_VALUE** 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 DhcpV4GetOptionValue(
    const uint16_t* ServerIpAddress,
    uint32_t Flags,
    uint32_t OptionID,
    const uint16_t* PolicyName,
    const uint16_t* VendorName,
    void* ScopeInfo,
    void* OptionValue);
C, "DHCPSAPI.dll");
// $ffi->DhcpV4GetOptionValue(ServerIpAddress, Flags, OptionID, PolicyName, VendorName, ScopeInfo, OptionValue);
// ServerIpAddress : LPWSTR optional
// Flags : DWORD
// OptionID : DWORD
// PolicyName : LPWSTR optional
// VendorName : LPWSTR optional
// ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out
// OptionValue : DHCP_OPTION_VALUE** 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 DhcpV4GetOptionValue(
        WString ServerIpAddress,   // LPWSTR optional
        int Flags,   // DWORD
        int OptionID,   // DWORD
        WString PolicyName,   // LPWSTR optional
        WString VendorName,   // LPWSTR optional
        Pointer ScopeInfo,   // DHCP_OPTION_SCOPE_INFO* in/out
        Pointer OptionValue   // DHCP_OPTION_VALUE** in/out
    );
}

@[Link("dhcpsapi")]
lib LibDHCPSAPI
  fun DhcpV4GetOptionValue = DhcpV4GetOptionValue(
    ServerIpAddress : UInt16*,   # LPWSTR optional
    Flags : UInt32,   # DWORD
    OptionID : UInt32,   # DWORD
    PolicyName : UInt16*,   # LPWSTR optional
    VendorName : UInt16*,   # LPWSTR optional
    ScopeInfo : DHCP_OPTION_SCOPE_INFO*,   # DHCP_OPTION_SCOPE_INFO* in/out
    OptionValue : DHCP_OPTION_VALUE**   # DHCP_OPTION_VALUE** 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 DhcpV4GetOptionValueNative = Uint32 Function(Pointer<Utf16>, Uint32, Uint32, Pointer<Utf16>, Pointer<Utf16>, Pointer<Void>, Pointer<Void>);
typedef DhcpV4GetOptionValueDart = int Function(Pointer<Utf16>, int, int, Pointer<Utf16>, Pointer<Utf16>, Pointer<Void>, Pointer<Void>);
final DhcpV4GetOptionValue = DynamicLibrary.open('DHCPSAPI.dll')
    .lookupFunction<DhcpV4GetOptionValueNative, DhcpV4GetOptionValueDart>('DhcpV4GetOptionValue');
// ServerIpAddress : LPWSTR optional -> Pointer<Utf16>
// Flags : DWORD -> Uint32
// OptionID : DWORD -> Uint32
// PolicyName : LPWSTR optional -> Pointer<Utf16>
// VendorName : LPWSTR optional -> Pointer<Utf16>
// ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> Pointer<Void>
// OptionValue : DHCP_OPTION_VALUE** in/out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function DhcpV4GetOptionValue(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  Flags: DWORD;   // DWORD
  OptionID: DWORD;   // DWORD
  PolicyName: PWideChar;   // LPWSTR optional
  VendorName: PWideChar;   // LPWSTR optional
  ScopeInfo: Pointer;   // DHCP_OPTION_SCOPE_INFO* in/out
  OptionValue: Pointer   // DHCP_OPTION_VALUE** in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4GetOptionValue';

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

foreign import stdcall safe "DhcpV4GetOptionValue"
  c_DhcpV4GetOptionValue :: CWString -> Word32 -> Word32 -> CWString -> CWString -> Ptr () -> Ptr () -> IO Word32
-- ServerIpAddress : LPWSTR optional -> CWString
-- Flags : DWORD -> Word32
-- OptionID : DWORD -> Word32
-- PolicyName : LPWSTR optional -> CWString
-- VendorName : LPWSTR optional -> CWString
-- ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> Ptr ()
-- OptionValue : DHCP_OPTION_VALUE** 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 dhcpv4getoptionvalue =
  foreign "DhcpV4GetOptionValue"
    ((ptr uint16_t) @-> uint32_t @-> uint32_t @-> (ptr uint16_t) @-> (ptr uint16_t) @-> (ptr void) @-> (ptr void) @-> returning uint32_t)
(* ServerIpAddress : LPWSTR optional -> (ptr uint16_t) *)
(* Flags : DWORD -> uint32_t *)
(* OptionID : DWORD -> uint32_t *)
(* PolicyName : LPWSTR optional -> (ptr uint16_t) *)
(* VendorName : LPWSTR optional -> (ptr uint16_t) *)
(* ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> (ptr void) *)
(* OptionValue : DHCP_OPTION_VALUE** 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 ("DhcpV4GetOptionValue" dhcp-v4-get-option-value :convention :stdcall) :uint32
  (server-ip-address (:string :encoding :utf-16le))   ; LPWSTR optional
  (flags :uint32)   ; DWORD
  (option-id :uint32)   ; DWORD
  (policy-name (:string :encoding :utf-16le))   ; LPWSTR optional
  (vendor-name (:string :encoding :utf-16le))   ; LPWSTR optional
  (scope-info :pointer)   ; DHCP_OPTION_SCOPE_INFO* in/out
  (option-value :pointer))   ; DHCP_OPTION_VALUE** in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $DhcpV4GetOptionValue = Win32::API::More->new('DHCPSAPI',
    'DWORD DhcpV4GetOptionValue(LPCWSTR ServerIpAddress, DWORD Flags, DWORD OptionID, LPCWSTR PolicyName, LPCWSTR VendorName, LPVOID ScopeInfo, LPVOID OptionValue)');
# my $ret = $DhcpV4GetOptionValue->Call($ServerIpAddress, $Flags, $OptionID, $PolicyName, $VendorName, $ScopeInfo, $OptionValue);
# ServerIpAddress : LPWSTR optional -> LPCWSTR
# Flags : DWORD -> DWORD
# OptionID : DWORD -> DWORD
# PolicyName : LPWSTR optional -> LPCWSTR
# VendorName : LPWSTR optional -> LPCWSTR
# ScopeInfo : DHCP_OPTION_SCOPE_INFO* in/out -> LPVOID
# OptionValue : DHCP_OPTION_VALUE** 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。

DhcpV4GetOptionValue

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