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DhcpEnumClasses

関数
DHCPサーバーに定義されたクラスの一覧を列挙する。
DLLDHCPSAPI.dll呼出規約winapi対応OSwindowsserver2008
📘 Microsoft Learn (日本語) · English

シグネチャ

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

DWORD DhcpEnumClasses(
    LPWSTR ServerIpAddress,   // optional
    DWORD ReservedMustBeZero,
    DWORD* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_CLASS_INFO_ARRAY** ClassInfoArray,
    DWORD* nRead,
    DWORD* nTotal
);

パラメーター

名前型方向説明
ServerIpAddressLPWSTRinoptional操作対象DHCPサーバのIPアドレスまたはホスト名(Unicode)。
ReservedMustBeZeroDWORDin予約パラメータ。必ず0を指定する。
ResumeHandleDWORD*inout列挙の再開位置を示すDWORDへのポインタ。初回は0を指す。
PreferredMaximumDWORDin一度に取得するクラス数の上限をバイト数で指定する。
ClassInfoArrayDHCP_CLASS_INFO_ARRAY**inout列挙結果を受け取るDHCP_CLASS_INFO_ARRAYへのポインタ。
nReadDWORD*inout今回読み取ったクラス数を受け取るDWORDへのポインタ。
nTotalDWORD*inout未列挙分も含む残りクラス総数を受け取る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 DhcpEnumClasses(
    LPWSTR ServerIpAddress,   // optional
    DWORD ReservedMustBeZero,
    DWORD* ResumeHandle,
    DWORD PreferredMaximum,
    DHCP_CLASS_INFO_ARRAY** ClassInfoArray,
    DWORD* nRead,
    DWORD* nTotal
);
[DllImport("DHCPSAPI.dll", ExactSpelling = true)]
static extern uint DhcpEnumClasses(
    [MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress,   // LPWSTR optional
    uint ReservedMustBeZero,   // DWORD
    ref uint ResumeHandle,   // DWORD* in/out
    uint PreferredMaximum,   // DWORD
    IntPtr ClassInfoArray,   // DHCP_CLASS_INFO_ARRAY** in/out
    ref uint nRead,   // DWORD* in/out
    ref uint nTotal   // DWORD* in/out
);
<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpEnumClasses(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    ReservedMustBeZero As UInteger,   ' DWORD
    ByRef ResumeHandle As UInteger,   ' DWORD* in/out
    PreferredMaximum As UInteger,   ' DWORD
    ClassInfoArray As IntPtr,   ' DHCP_CLASS_INFO_ARRAY** in/out
    ByRef nRead As UInteger,   ' DWORD* in/out
    ByRef nTotal As UInteger   ' DWORD* in/out
) As UInteger
End Function
' ServerIpAddress : LPWSTR optional
' ReservedMustBeZero : DWORD
' ResumeHandle : DWORD* in/out
' PreferredMaximum : DWORD
' ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out
' nRead : DWORD* in/out
' nTotal : DWORD* in/out
Declare PtrSafe Function DhcpEnumClasses Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal ReservedMustBeZero As Long, _
    ByRef ResumeHandle As Long, _
    ByVal PreferredMaximum As Long, _
    ByVal ClassInfoArray As LongPtr, _
    ByRef nRead As Long, _
    ByRef nTotal 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

DhcpEnumClasses = ctypes.windll.dhcpsapi.DhcpEnumClasses
DhcpEnumClasses.restype = wintypes.DWORD
DhcpEnumClasses.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    wintypes.DWORD,  # ReservedMustBeZero : DWORD
    ctypes.POINTER(wintypes.DWORD),  # ResumeHandle : DWORD* in/out
    wintypes.DWORD,  # PreferredMaximum : DWORD
    ctypes.c_void_p,  # ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out
    ctypes.POINTER(wintypes.DWORD),  # nRead : DWORD* in/out
    ctypes.POINTER(wintypes.DWORD),  # nTotal : DWORD* in/out
]
require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpEnumClasses = Fiddle::Function.new(
  lib['DhcpEnumClasses'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    -Fiddle::TYPE_INT,  # ReservedMustBeZero : DWORD
    Fiddle::TYPE_VOIDP,  # ResumeHandle : DWORD* in/out
    -Fiddle::TYPE_INT,  # PreferredMaximum : DWORD
    Fiddle::TYPE_VOIDP,  # ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out
    Fiddle::TYPE_VOIDP,  # nRead : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # nTotal : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)
#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpEnumClasses(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        ReservedMustBeZero: u32,  // DWORD
        ResumeHandle: *mut u32,  // DWORD* in/out
        PreferredMaximum: u32,  // DWORD
        ClassInfoArray: *mut *mut DHCP_CLASS_INFO_ARRAY,  // DHCP_CLASS_INFO_ARRAY** in/out
        nRead: *mut u32,  // DWORD* in/out
        nTotal: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.
$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpEnumClasses([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, uint ReservedMustBeZero, ref uint ResumeHandle, uint PreferredMaximum, IntPtr ClassInfoArray, ref uint nRead, ref uint nTotal);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpEnumClasses' -Namespace Win32 -PassThru
# $api::DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
#uselib "DHCPSAPI.dll"
#func global DhcpEnumClasses "DhcpEnumClasses" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; DhcpEnumClasses ServerIpAddress, ReservedMustBeZero, varptr(ResumeHandle), PreferredMaximum, varptr(ClassInfoArray), varptr(nRead), varptr(nTotal)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; ReservedMustBeZero : DWORD -> "sptr"
; ResumeHandle : DWORD* in/out -> "sptr"
; PreferredMaximum : DWORD -> "sptr"
; ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> "sptr"
; nRead : DWORD* in/out -> "sptr"
; nTotal : DWORD* 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 DhcpEnumClasses "DhcpEnumClasses" wstr, int, var, int, var, var, var
; res = DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
; ServerIpAddress : LPWSTR optional -> "wstr"
; ReservedMustBeZero : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> "var"
; nRead : DWORD* in/out -> "var"
; nTotal : DWORD* 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。
出力引数: 
; DWORD DhcpEnumClasses(LPWSTR ServerIpAddress, DWORD ReservedMustBeZero, DWORD* ResumeHandle, DWORD PreferredMaximum, DHCP_CLASS_INFO_ARRAY** ClassInfoArray, DWORD* nRead, DWORD* nTotal)
#uselib "DHCPSAPI.dll"
#cfunc global DhcpEnumClasses "DhcpEnumClasses" wstr, int, var, int, var, var, var
; res = DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
; ServerIpAddress : LPWSTR optional -> "wstr"
; ReservedMustBeZero : DWORD -> "int"
; ResumeHandle : DWORD* in/out -> "var"
; PreferredMaximum : DWORD -> "int"
; ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> "var"
; nRead : DWORD* in/out -> "var"
; nTotal : DWORD* 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。
import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	dhcpsapi = windows.NewLazySystemDLL("DHCPSAPI.dll")
	procDhcpEnumClasses = dhcpsapi.NewProc("DhcpEnumClasses")
)

// ServerIpAddress (LPWSTR optional), ReservedMustBeZero (DWORD), ResumeHandle (DWORD* in/out), PreferredMaximum (DWORD), ClassInfoArray (DHCP_CLASS_INFO_ARRAY** in/out), nRead (DWORD* in/out), nTotal (DWORD* in/out)
r1, _, err := procDhcpEnumClasses.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(ReservedMustBeZero),
	uintptr(ResumeHandle),
	uintptr(PreferredMaximum),
	uintptr(ClassInfoArray),
	uintptr(nRead),
	uintptr(nTotal),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD
function DhcpEnumClasses(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  ReservedMustBeZero: DWORD;   // DWORD
  ResumeHandle: Pointer;   // DWORD* in/out
  PreferredMaximum: DWORD;   // DWORD
  ClassInfoArray: Pointer;   // DHCP_CLASS_INFO_ARRAY** in/out
  nRead: Pointer;   // DWORD* in/out
  nTotal: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpEnumClasses';
result := DllCall("DHCPSAPI\DhcpEnumClasses"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "UInt", ReservedMustBeZero   ; DWORD
    , "Ptr", ResumeHandle   ; DWORD* in/out
    , "UInt", PreferredMaximum   ; DWORD
    , "Ptr", ClassInfoArray   ; DHCP_CLASS_INFO_ARRAY** in/out
    , "Ptr", nRead   ; DWORD* in/out
    , "Ptr", nTotal   ; DWORD* in/out
    , "UInt")   ; return: DWORD
●DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal) = DLL("DHCPSAPI.dll", "dword DhcpEnumClasses(char*, dword, void*, dword, void*, void*, void*)")
# 呼び出し: DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
# ServerIpAddress : LPWSTR optional -> "char*"
# ReservedMustBeZero : DWORD -> "dword"
# ResumeHandle : DWORD* in/out -> "void*"
# PreferredMaximum : DWORD -> "dword"
# ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> "void*"
# nRead : DWORD* in/out -> "void*"
# nTotal : DWORD* 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 DhcpEnumClasses(
    ServerIpAddress: [*c]const u16, // LPWSTR optional
    ReservedMustBeZero: u32, // DWORD
    ResumeHandle: [*c]u32, // DWORD* in/out
    PreferredMaximum: u32, // DWORD
    ClassInfoArray: [*c][*c]DHCP_CLASS_INFO_ARRAY, // DHCP_CLASS_INFO_ARRAY** in/out
    nRead: [*c]u32, // DWORD* in/out
    nTotal: [*c]u32 // DWORD* in/out
) callconv(std.os.windows.WINAPI) u32;
proc DhcpEnumClasses(
    ServerIpAddress: WideCString,  # LPWSTR optional
    ReservedMustBeZero: uint32,  # DWORD
    ResumeHandle: ptr uint32,  # DWORD* in/out
    PreferredMaximum: uint32,  # DWORD
    ClassInfoArray: ptr DHCP_CLASS_INFO_ARRAY,  # DHCP_CLASS_INFO_ARRAY** in/out
    nRead: ptr uint32,  # DWORD* in/out
    nTotal: ptr uint32  # DWORD* in/out
): uint32 {.importc: "DhcpEnumClasses", stdcall, dynlib: "DHCPSAPI.dll".}
pragma(lib, "dhcpsapi");
extern(Windows)
uint DhcpEnumClasses(
    const(wchar)* ServerIpAddress,   // LPWSTR optional
    uint ReservedMustBeZero,   // DWORD
    uint* ResumeHandle,   // DWORD* in/out
    uint PreferredMaximum,   // DWORD
    DHCP_CLASS_INFO_ARRAY** ClassInfoArray,   // DHCP_CLASS_INFO_ARRAY** in/out
    uint* nRead,   // DWORD* in/out
    uint* nTotal   // DWORD* in/out
);
ccall((:DhcpEnumClasses, "DHCPSAPI.dll"), stdcall, UInt32,
      (Cwstring, UInt32, Ptr{UInt32}, UInt32, Ptr{DHCP_CLASS_INFO_ARRAY}, Ptr{UInt32}, Ptr{UInt32}),
      ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
# ServerIpAddress : LPWSTR optional -> Cwstring
# ReservedMustBeZero : DWORD -> UInt32
# ResumeHandle : DWORD* in/out -> Ptr{UInt32}
# PreferredMaximum : DWORD -> UInt32
# ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> Ptr{DHCP_CLASS_INFO_ARRAY}
# nRead : DWORD* in/out -> Ptr{UInt32}
# nTotal : DWORD* in/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 DhcpEnumClasses(
    const uint16_t* ServerIpAddress,
    uint32_t ReservedMustBeZero,
    uint32_t* ResumeHandle,
    uint32_t PreferredMaximum,
    void* ClassInfoArray,
    uint32_t* nRead,
    uint32_t* nTotal);
]]
local dhcpsapi = ffi.load("dhcpsapi")
-- dhcpsapi.DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
-- ServerIpAddress : LPWSTR optional
-- ReservedMustBeZero : DWORD
-- ResumeHandle : DWORD* in/out
-- PreferredMaximum : DWORD
-- ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out
-- nRead : DWORD* in/out
-- nTotal : DWORD* 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 DhcpEnumClasses = lib.func('__stdcall', 'DhcpEnumClasses', 'uint32_t', ['str16', 'uint32_t', 'uint32_t *', 'uint32_t', 'void *', 'uint32_t *', 'uint32_t *']);
// DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
// ServerIpAddress : LPWSTR optional -> 'str16'
// ReservedMustBeZero : DWORD -> 'uint32_t'
// ResumeHandle : DWORD* in/out -> 'uint32_t *'
// PreferredMaximum : DWORD -> 'uint32_t'
// ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> 'void *'
// nRead : DWORD* in/out -> 'uint32_t *'
// nTotal : DWORD* in/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", {
  DhcpEnumClasses: { parameters: ["buffer", "u32", "pointer", "u32", "pointer", "pointer", "pointer"], result: "u32" },
});
// lib.symbols.DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal)
// ServerIpAddress : LPWSTR optional -> "buffer"
// ReservedMustBeZero : DWORD -> "u32"
// ResumeHandle : DWORD* in/out -> "pointer"
// PreferredMaximum : DWORD -> "u32"
// ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> "pointer"
// nRead : DWORD* in/out -> "pointer"
// nTotal : DWORD* 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 DhcpEnumClasses(
    const uint16_t* ServerIpAddress,
    uint32_t ReservedMustBeZero,
    uint32_t* ResumeHandle,
    uint32_t PreferredMaximum,
    void* ClassInfoArray,
    uint32_t* nRead,
    uint32_t* nTotal);
C, "DHCPSAPI.dll");
// $ffi->DhcpEnumClasses(ServerIpAddress, ReservedMustBeZero, ResumeHandle, PreferredMaximum, ClassInfoArray, nRead, nTotal);
// ServerIpAddress : LPWSTR optional
// ReservedMustBeZero : DWORD
// ResumeHandle : DWORD* in/out
// PreferredMaximum : DWORD
// ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out
// nRead : DWORD* in/out
// nTotal : DWORD* 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 DhcpEnumClasses(
        WString ServerIpAddress,   // LPWSTR optional
        int ReservedMustBeZero,   // DWORD
        IntByReference ResumeHandle,   // DWORD* in/out
        int PreferredMaximum,   // DWORD
        Pointer ClassInfoArray,   // DHCP_CLASS_INFO_ARRAY** in/out
        IntByReference nRead,   // DWORD* in/out
        IntByReference nTotal   // DWORD* in/out
    );
}
@[Link("dhcpsapi")]
lib LibDHCPSAPI
  fun DhcpEnumClasses = DhcpEnumClasses(
    ServerIpAddress : UInt16*,   # LPWSTR optional
    ReservedMustBeZero : UInt32,   # DWORD
    ResumeHandle : UInt32*,   # DWORD* in/out
    PreferredMaximum : UInt32,   # DWORD
    ClassInfoArray : DHCP_CLASS_INFO_ARRAY**,   # DHCP_CLASS_INFO_ARRAY** in/out
    nRead : UInt32*,   # DWORD* in/out
    nTotal : UInt32*   # DWORD* 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 DhcpEnumClassesNative = Uint32 Function(Pointer<Utf16>, Uint32, Pointer<Uint32>, Uint32, Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>);
typedef DhcpEnumClassesDart = int Function(Pointer<Utf16>, int, Pointer<Uint32>, int, Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>);
final DhcpEnumClasses = DynamicLibrary.open('DHCPSAPI.dll')
    .lookupFunction<DhcpEnumClassesNative, DhcpEnumClassesDart>('DhcpEnumClasses');
// ServerIpAddress : LPWSTR optional -> Pointer<Utf16>
// ReservedMustBeZero : DWORD -> Uint32
// ResumeHandle : DWORD* in/out -> Pointer<Uint32>
// PreferredMaximum : DWORD -> Uint32
// ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> Pointer<Void>
// nRead : DWORD* in/out -> Pointer<Uint32>
// nTotal : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。
{$mode objfpc}{$H+}
function DhcpEnumClasses(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  ReservedMustBeZero: DWORD;   // DWORD
  ResumeHandle: Pointer;   // DWORD* in/out
  PreferredMaximum: DWORD;   // DWORD
  ClassInfoArray: Pointer;   // DHCP_CLASS_INFO_ARRAY** in/out
  nRead: Pointer;   // DWORD* in/out
  nTotal: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpEnumClasses';
import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "DhcpEnumClasses"
  c_DhcpEnumClasses :: CWString -> Word32 -> Ptr Word32 -> Word32 -> Ptr () -> Ptr Word32 -> Ptr Word32 -> IO Word32
-- ServerIpAddress : LPWSTR optional -> CWString
-- ReservedMustBeZero : DWORD -> Word32
-- ResumeHandle : DWORD* in/out -> Ptr Word32
-- PreferredMaximum : DWORD -> Word32
-- ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> Ptr ()
-- nRead : DWORD* in/out -> Ptr Word32
-- nTotal : DWORD* in/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 dhcpenumclasses =
  foreign "DhcpEnumClasses"
    ((ptr uint16_t) @-> uint32_t @-> (ptr uint32_t) @-> uint32_t @-> (ptr void) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> returning uint32_t)
(* ServerIpAddress : LPWSTR optional -> (ptr uint16_t) *)
(* ReservedMustBeZero : DWORD -> uint32_t *)
(* ResumeHandle : DWORD* in/out -> (ptr uint32_t) *)
(* PreferredMaximum : DWORD -> uint32_t *)
(* ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> (ptr void) *)
(* nRead : DWORD* in/out -> (ptr uint32_t) *)
(* nTotal : DWORD* in/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 ("DhcpEnumClasses" dhcp-enum-classes :convention :stdcall) :uint32
  (server-ip-address (:string :encoding :utf-16le))   ; LPWSTR optional
  (reserved-must-be-zero :uint32)   ; DWORD
  (resume-handle :pointer)   ; DWORD* in/out
  (preferred-maximum :uint32)   ; DWORD
  (class-info-array :pointer)   ; DHCP_CLASS_INFO_ARRAY** in/out
  (n-read :pointer)   ; DWORD* in/out
  (n-total :pointer))   ; DWORD* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。
use Win32::API;
my $DhcpEnumClasses = Win32::API::More->new('DHCPSAPI',
    'DWORD DhcpEnumClasses(LPCWSTR ServerIpAddress, DWORD ReservedMustBeZero, LPVOID ResumeHandle, DWORD PreferredMaximum, LPVOID ClassInfoArray, LPVOID nRead, LPVOID nTotal)');
# my $ret = $DhcpEnumClasses->Call($ServerIpAddress, $ReservedMustBeZero, $ResumeHandle, $PreferredMaximum, $ClassInfoArray, $nRead, $nTotal);
# ServerIpAddress : LPWSTR optional -> LPCWSTR
# ReservedMustBeZero : DWORD -> DWORD
# ResumeHandle : DWORD* in/out -> LPVOID
# PreferredMaximum : DWORD -> DWORD
# ClassInfoArray : DHCP_CLASS_INFO_ARRAY** in/out -> LPVOID
# nRead : DWORD* in/out -> LPVOID
# nTotal : DWORD* 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。

関連項目

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