DhcpV4GetPolicy

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

DWORD DhcpV4GetPolicy(
    LPWSTR ServerIpAddress,   // optional
    BOOL fGlobalPolicy,
    DWORD SubnetAddress,
    LPWSTR PolicyName,
    DHCP_POLICY** Policy
);

<DllImport("DHCPSAPI.dll", ExactSpelling:=True)>
Public Shared Function DhcpV4GetPolicy(
    <MarshalAs(UnmanagedType.LPWStr)> ServerIpAddress As String,   ' LPWSTR optional
    fGlobalPolicy As Boolean,   ' BOOL
    SubnetAddress As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> PolicyName As String,   ' LPWSTR
    Policy As IntPtr   ' DHCP_POLICY** out
) As UInteger
End Function

' ServerIpAddress : LPWSTR optional
' fGlobalPolicy : BOOL
' SubnetAddress : DWORD
' PolicyName : LPWSTR
' Policy : DHCP_POLICY** out
Declare PtrSafe Function DhcpV4GetPolicy Lib "dhcpsapi" ( _
    ByVal ServerIpAddress As LongPtr, _
    ByVal fGlobalPolicy As Long, _
    ByVal SubnetAddress As Long, _
    ByVal PolicyName As LongPtr, _
    ByVal Policy 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

DhcpV4GetPolicy = ctypes.windll.dhcpsapi.DhcpV4GetPolicy
DhcpV4GetPolicy.restype = wintypes.DWORD
DhcpV4GetPolicy.argtypes = [
    wintypes.LPCWSTR,  # ServerIpAddress : LPWSTR optional
    wintypes.BOOL,  # fGlobalPolicy : BOOL
    wintypes.DWORD,  # SubnetAddress : DWORD
    wintypes.LPCWSTR,  # PolicyName : LPWSTR
    ctypes.c_void_p,  # Policy : DHCP_POLICY** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DHCPSAPI.dll')
DhcpV4GetPolicy = Fiddle::Function.new(
  lib['DhcpV4GetPolicy'],
  [
    Fiddle::TYPE_VOIDP,  # ServerIpAddress : LPWSTR optional
    Fiddle::TYPE_INT,  # fGlobalPolicy : BOOL
    -Fiddle::TYPE_INT,  # SubnetAddress : DWORD
    Fiddle::TYPE_VOIDP,  # PolicyName : LPWSTR
    Fiddle::TYPE_VOIDP,  # Policy : DHCP_POLICY** out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "dhcpsapi")]
extern "system" {
    fn DhcpV4GetPolicy(
        ServerIpAddress: *mut u16,  // LPWSTR optional
        fGlobalPolicy: i32,  // BOOL
        SubnetAddress: u32,  // DWORD
        PolicyName: *mut u16,  // LPWSTR
        Policy: *mut *mut DHCP_POLICY  // DHCP_POLICY** out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DHCPSAPI.dll")]
public static extern uint DhcpV4GetPolicy([MarshalAs(UnmanagedType.LPWStr)] string ServerIpAddress, bool fGlobalPolicy, uint SubnetAddress, [MarshalAs(UnmanagedType.LPWStr)] string PolicyName, IntPtr Policy);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DHCPSAPI_DhcpV4GetPolicy' -Namespace Win32 -PassThru
# $api::DhcpV4GetPolicy(ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy)

#uselib "DHCPSAPI.dll"
#func global DhcpV4GetPolicy "DhcpV4GetPolicy" sptr, sptr, sptr, sptr, sptr
; DhcpV4GetPolicy ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, varptr(Policy)   ; 戻り値は stat
; ServerIpAddress : LPWSTR optional -> "sptr"
; fGlobalPolicy : BOOL -> "sptr"
; SubnetAddress : DWORD -> "sptr"
; PolicyName : LPWSTR -> "sptr"
; Policy : DHCP_POLICY** 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")
	procDhcpV4GetPolicy = dhcpsapi.NewProc("DhcpV4GetPolicy")
)

// ServerIpAddress (LPWSTR optional), fGlobalPolicy (BOOL), SubnetAddress (DWORD), PolicyName (LPWSTR), Policy (DHCP_POLICY** out)
r1, _, err := procDhcpV4GetPolicy.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(ServerIpAddress))),
	uintptr(fGlobalPolicy),
	uintptr(SubnetAddress),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(PolicyName))),
	uintptr(Policy),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function DhcpV4GetPolicy(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  fGlobalPolicy: BOOL;   // BOOL
  SubnetAddress: DWORD;   // DWORD
  PolicyName: PWideChar;   // LPWSTR
  Policy: Pointer   // DHCP_POLICY** out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4GetPolicy';

result := DllCall("DHCPSAPI\DhcpV4GetPolicy"
    , "WStr", ServerIpAddress   ; LPWSTR optional
    , "Int", fGlobalPolicy   ; BOOL
    , "UInt", SubnetAddress   ; DWORD
    , "WStr", PolicyName   ; LPWSTR
    , "Ptr", Policy   ; DHCP_POLICY** out
    , "UInt")   ; return: DWORD

●DhcpV4GetPolicy(ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy) = DLL("DHCPSAPI.dll", "dword DhcpV4GetPolicy(char*, bool, dword, char*, void*)")
# 呼び出し: DhcpV4GetPolicy(ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy)
# ServerIpAddress : LPWSTR optional -> "char*"
# fGlobalPolicy : BOOL -> "bool"
# SubnetAddress : DWORD -> "dword"
# PolicyName : LPWSTR -> "char*"
# Policy : DHCP_POLICY** 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 DhcpV4GetPolicy(
    ServerIpAddress: [*c]const u16, // LPWSTR optional
    fGlobalPolicy: i32, // BOOL
    SubnetAddress: u32, // DWORD
    PolicyName: [*c]const u16, // LPWSTR
    Policy: [*c][*c]DHCP_POLICY // DHCP_POLICY** out
) callconv(std.os.windows.WINAPI) u32;

proc DhcpV4GetPolicy(
    ServerIpAddress: WideCString,  # LPWSTR optional
    fGlobalPolicy: int32,  # BOOL
    SubnetAddress: uint32,  # DWORD
    PolicyName: WideCString,  # LPWSTR
    Policy: ptr DHCP_POLICY  # DHCP_POLICY** out
): uint32 {.importc: "DhcpV4GetPolicy", stdcall, dynlib: "DHCPSAPI.dll".}

pragma(lib, "dhcpsapi");
extern(Windows)
uint DhcpV4GetPolicy(
    const(wchar)* ServerIpAddress,   // LPWSTR optional
    int fGlobalPolicy,   // BOOL
    uint SubnetAddress,   // DWORD
    const(wchar)* PolicyName,   // LPWSTR
    DHCP_POLICY** Policy   // DHCP_POLICY** out
);

ccall((:DhcpV4GetPolicy, "DHCPSAPI.dll"), stdcall, UInt32,
      (Cwstring, Int32, UInt32, Cwstring, Ptr{DHCP_POLICY}),
      ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy)
# ServerIpAddress : LPWSTR optional -> Cwstring
# fGlobalPolicy : BOOL -> Int32
# SubnetAddress : DWORD -> UInt32
# PolicyName : LPWSTR -> Cwstring
# Policy : DHCP_POLICY** out -> Ptr{DHCP_POLICY}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t DhcpV4GetPolicy(
    const uint16_t* ServerIpAddress,
    int32_t fGlobalPolicy,
    uint32_t SubnetAddress,
    const uint16_t* PolicyName,
    void* Policy);
]]
local dhcpsapi = ffi.load("dhcpsapi")
-- dhcpsapi.DhcpV4GetPolicy(ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy)
-- ServerIpAddress : LPWSTR optional
-- fGlobalPolicy : BOOL
-- SubnetAddress : DWORD
-- PolicyName : LPWSTR
-- Policy : DHCP_POLICY** 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 DhcpV4GetPolicy = lib.func('__stdcall', 'DhcpV4GetPolicy', 'uint32_t', ['str16', 'int32_t', 'uint32_t', 'str16', 'void *']);
// DhcpV4GetPolicy(ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy)
// ServerIpAddress : LPWSTR optional -> 'str16'
// fGlobalPolicy : BOOL -> 'int32_t'
// SubnetAddress : DWORD -> 'uint32_t'
// PolicyName : LPWSTR -> 'str16'
// Policy : DHCP_POLICY** 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", {
  DhcpV4GetPolicy: { parameters: ["buffer", "i32", "u32", "buffer", "pointer"], result: "u32" },
});
// lib.symbols.DhcpV4GetPolicy(ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy)
// ServerIpAddress : LPWSTR optional -> "buffer"
// fGlobalPolicy : BOOL -> "i32"
// SubnetAddress : DWORD -> "u32"
// PolicyName : LPWSTR -> "buffer"
// Policy : DHCP_POLICY** 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 DhcpV4GetPolicy(
    const uint16_t* ServerIpAddress,
    int32_t fGlobalPolicy,
    uint32_t SubnetAddress,
    const uint16_t* PolicyName,
    void* Policy);
C, "DHCPSAPI.dll");
// $ffi->DhcpV4GetPolicy(ServerIpAddress, fGlobalPolicy, SubnetAddress, PolicyName, Policy);
// ServerIpAddress : LPWSTR optional
// fGlobalPolicy : BOOL
// SubnetAddress : DWORD
// PolicyName : LPWSTR
// Policy : DHCP_POLICY** 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 DhcpV4GetPolicy(
        WString ServerIpAddress,   // LPWSTR optional
        boolean fGlobalPolicy,   // BOOL
        int SubnetAddress,   // DWORD
        WString PolicyName,   // LPWSTR
        Pointer Policy   // DHCP_POLICY** out
    );
}

@[Link("dhcpsapi")]
lib LibDHCPSAPI
  fun DhcpV4GetPolicy = DhcpV4GetPolicy(
    ServerIpAddress : UInt16*,   # LPWSTR optional
    fGlobalPolicy : Int32,   # BOOL
    SubnetAddress : UInt32,   # DWORD
    PolicyName : UInt16*,   # LPWSTR
    Policy : DHCP_POLICY**   # DHCP_POLICY** 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 DhcpV4GetPolicyNative = Uint32 Function(Pointer<Utf16>, Int32, Uint32, Pointer<Utf16>, Pointer<Void>);
typedef DhcpV4GetPolicyDart = int Function(Pointer<Utf16>, int, int, Pointer<Utf16>, Pointer<Void>);
final DhcpV4GetPolicy = DynamicLibrary.open('DHCPSAPI.dll')
    .lookupFunction<DhcpV4GetPolicyNative, DhcpV4GetPolicyDart>('DhcpV4GetPolicy');
// ServerIpAddress : LPWSTR optional -> Pointer<Utf16>
// fGlobalPolicy : BOOL -> Int32
// SubnetAddress : DWORD -> Uint32
// PolicyName : LPWSTR -> Pointer<Utf16>
// Policy : DHCP_POLICY** out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function DhcpV4GetPolicy(
  ServerIpAddress: PWideChar;   // LPWSTR optional
  fGlobalPolicy: BOOL;   // BOOL
  SubnetAddress: DWORD;   // DWORD
  PolicyName: PWideChar;   // LPWSTR
  Policy: Pointer   // DHCP_POLICY** out
): DWORD; stdcall;
  external 'DHCPSAPI.dll' name 'DhcpV4GetPolicy';

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

foreign import stdcall safe "DhcpV4GetPolicy"
  c_DhcpV4GetPolicy :: CWString -> CInt -> Word32 -> CWString -> Ptr () -> IO Word32
-- ServerIpAddress : LPWSTR optional -> CWString
-- fGlobalPolicy : BOOL -> CInt
-- SubnetAddress : DWORD -> Word32
-- PolicyName : LPWSTR -> CWString
-- Policy : DHCP_POLICY** 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 dhcpv4getpolicy =
  foreign "DhcpV4GetPolicy"
    ((ptr uint16_t) @-> int32_t @-> uint32_t @-> (ptr uint16_t) @-> (ptr void) @-> returning uint32_t)
(* ServerIpAddress : LPWSTR optional -> (ptr uint16_t) *)
(* fGlobalPolicy : BOOL -> int32_t *)
(* SubnetAddress : DWORD -> uint32_t *)
(* PolicyName : LPWSTR -> (ptr uint16_t) *)
(* Policy : DHCP_POLICY** 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 ("DhcpV4GetPolicy" dhcp-v4-get-policy :convention :stdcall) :uint32
  (server-ip-address (:string :encoding :utf-16le))   ; LPWSTR optional
  (f-global-policy :int32)   ; BOOL
  (subnet-address :uint32)   ; DWORD
  (policy-name (:string :encoding :utf-16le))   ; LPWSTR
  (policy :pointer))   ; DHCP_POLICY** out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $DhcpV4GetPolicy = Win32::API::More->new('DHCPSAPI',
    'DWORD DhcpV4GetPolicy(LPCWSTR ServerIpAddress, BOOL fGlobalPolicy, DWORD SubnetAddress, LPCWSTR PolicyName, LPVOID Policy)');
# my $ret = $DhcpV4GetPolicy->Call($ServerIpAddress, $fGlobalPolicy, $SubnetAddress, $PolicyName, $Policy);
# ServerIpAddress : LPWSTR optional -> LPCWSTR
# fGlobalPolicy : BOOL -> BOOL
# SubnetAddress : DWORD -> DWORD
# PolicyName : LPWSTR -> LPCWSTR
# Policy : DHCP_POLICY** out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。