DnsFreeCustomServers

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

void DnsFreeCustomServers(
    DWORD* pcServers,
    DNS_CUSTOM_SERVER** ppServers
);

<DllImport("DNSAPI.dll", ExactSpelling:=True)>
Public Shared Sub DnsFreeCustomServers(
    ByRef pcServers As UInteger,   ' DWORD* in/out
    ppServers As IntPtr   ' DNS_CUSTOM_SERVER** in/out
)
End Sub

' pcServers : DWORD* in/out
' ppServers : DNS_CUSTOM_SERVER** in/out
Declare PtrSafe Sub DnsFreeCustomServers Lib "dnsapi" ( _
    ByRef pcServers As Long, _
    ByVal ppServers As LongPtr)
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

DnsFreeCustomServers = ctypes.windll.dnsapi.DnsFreeCustomServers
DnsFreeCustomServers.restype = None
DnsFreeCustomServers.argtypes = [
    ctypes.POINTER(wintypes.DWORD),  # pcServers : DWORD* in/out
    ctypes.c_void_p,  # ppServers : DNS_CUSTOM_SERVER** in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('DNSAPI.dll')
DnsFreeCustomServers = Fiddle::Function.new(
  lib['DnsFreeCustomServers'],
  [
    Fiddle::TYPE_VOIDP,  # pcServers : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # ppServers : DNS_CUSTOM_SERVER** in/out
  ],
  Fiddle::TYPE_VOID)

#[link(name = "dnsapi")]
extern "system" {
    fn DnsFreeCustomServers(
        pcServers: *mut u32,  // DWORD* in/out
        ppServers: *mut *mut DNS_CUSTOM_SERVER  // DNS_CUSTOM_SERVER** in/out
    );
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("DNSAPI.dll")]
public static extern void DnsFreeCustomServers(ref uint pcServers, IntPtr ppServers);
"@
$api = Add-Type -MemberDefinition $sig -Name 'DNSAPI_DnsFreeCustomServers' -Namespace Win32 -PassThru
# $api::DnsFreeCustomServers(pcServers, ppServers)

#uselib "DNSAPI.dll"
#func global DnsFreeCustomServers "DnsFreeCustomServers" sptr, sptr
; DnsFreeCustomServers varptr(pcServers), varptr(ppServers)
; pcServers : DWORD* in/out -> "sptr"
; ppServers : DNS_CUSTOM_SERVER** in/out -> "sptr"

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

var (
	dnsapi = windows.NewLazySystemDLL("DNSAPI.dll")
	procDnsFreeCustomServers = dnsapi.NewProc("DnsFreeCustomServers")
)

// pcServers (DWORD* in/out), ppServers (DNS_CUSTOM_SERVER** in/out)
r1, _, err := procDnsFreeCustomServers.Call(
	uintptr(pcServers),
	uintptr(ppServers),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // void

procedure DnsFreeCustomServers(
  pcServers: Pointer;   // DWORD* in/out
  ppServers: Pointer   // DNS_CUSTOM_SERVER** in/out
); stdcall;
  external 'DNSAPI.dll' name 'DnsFreeCustomServers';

result := DllCall("DNSAPI\DnsFreeCustomServers"
    , "Ptr", pcServers   ; DWORD* in/out
    , "Ptr", ppServers   ; DNS_CUSTOM_SERVER** in/out
    , "Int")   ; return: void

●DnsFreeCustomServers(pcServers, ppServers) = DLL("DNSAPI.dll", "int DnsFreeCustomServers(void*, void*)")
# 呼び出し: DnsFreeCustomServers(pcServers, ppServers)
# pcServers : DWORD* in/out -> "void*"
# ppServers : DNS_CUSTOM_SERVER** 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 "dnsapi" fn DnsFreeCustomServers(
    pcServers: [*c]u32, // DWORD* in/out
    ppServers: [*c][*c]DNS_CUSTOM_SERVER // DNS_CUSTOM_SERVER** in/out
) callconv(std.os.windows.WINAPI) void;

proc DnsFreeCustomServers(
    pcServers: ptr uint32,  # DWORD* in/out
    ppServers: ptr DNS_CUSTOM_SERVER  # DNS_CUSTOM_SERVER** in/out
) {.importc: "DnsFreeCustomServers", stdcall, dynlib: "DNSAPI.dll".}

pragma(lib, "dnsapi");
extern(Windows)
void DnsFreeCustomServers(
    uint* pcServers,   // DWORD* in/out
    DNS_CUSTOM_SERVER** ppServers   // DNS_CUSTOM_SERVER** in/out
);

ccall((:DnsFreeCustomServers, "DNSAPI.dll"), stdcall, Cvoid,
      (Ptr{UInt32}, Ptr{DNS_CUSTOM_SERVER}),
      pcServers, ppServers)
# pcServers : DWORD* in/out -> Ptr{UInt32}
# ppServers : DNS_CUSTOM_SERVER** in/out -> Ptr{DNS_CUSTOM_SERVER}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void DnsFreeCustomServers(
    uint32_t* pcServers,
    void* ppServers);
]]
local dnsapi = ffi.load("dnsapi")
-- dnsapi.DnsFreeCustomServers(pcServers, ppServers)
-- pcServers : DWORD* in/out
-- ppServers : DNS_CUSTOM_SERVER** 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('DNSAPI.dll');
const DnsFreeCustomServers = lib.func('__stdcall', 'DnsFreeCustomServers', 'void', ['uint32_t *', 'void *']);
// DnsFreeCustomServers(pcServers, ppServers)
// pcServers : DWORD* in/out -> 'uint32_t *'
// ppServers : DNS_CUSTOM_SERVER** 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("DNSAPI.dll", {
  DnsFreeCustomServers: { parameters: ["pointer", "pointer"], result: "void" },
});
// lib.symbols.DnsFreeCustomServers(pcServers, ppServers)
// pcServers : DWORD* in/out -> "pointer"
// ppServers : DNS_CUSTOM_SERVER** 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
void DnsFreeCustomServers(
    uint32_t* pcServers,
    void* ppServers);
C, "DNSAPI.dll");
// $ffi->DnsFreeCustomServers(pcServers, ppServers);
// pcServers : DWORD* in/out
// ppServers : DNS_CUSTOM_SERVER** 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 Dnsapi extends StdCallLibrary {
    Dnsapi INSTANCE = Native.load("dnsapi", Dnsapi.class);
    void DnsFreeCustomServers(
        IntByReference pcServers,   // DWORD* in/out
        Pointer ppServers   // DNS_CUSTOM_SERVER** in/out
    );
}

@[Link("dnsapi")]
lib LibDNSAPI
  fun DnsFreeCustomServers = DnsFreeCustomServers(
    pcServers : UInt32*,   # DWORD* in/out
    ppServers : DNS_CUSTOM_SERVER**   # DNS_CUSTOM_SERVER** in/out
  ) : Void
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 DnsFreeCustomServersNative = Void Function(Pointer<Uint32>, Pointer<Void>);
typedef DnsFreeCustomServersDart = void Function(Pointer<Uint32>, Pointer<Void>);
final DnsFreeCustomServers = DynamicLibrary.open('DNSAPI.dll')
    .lookupFunction<DnsFreeCustomServersNative, DnsFreeCustomServersDart>('DnsFreeCustomServers');
// pcServers : DWORD* in/out -> Pointer<Uint32>
// ppServers : DNS_CUSTOM_SERVER** in/out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
procedure DnsFreeCustomServers(
  pcServers: Pointer;   // DWORD* in/out
  ppServers: Pointer   // DNS_CUSTOM_SERVER** in/out
); stdcall;
  external 'DNSAPI.dll' name 'DnsFreeCustomServers';

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

foreign import stdcall safe "DnsFreeCustomServers"
  c_DnsFreeCustomServers :: Ptr Word32 -> Ptr () -> IO ()
-- pcServers : DWORD* in/out -> Ptr Word32
-- ppServers : DNS_CUSTOM_SERVER** 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 dnsfreecustomservers =
  foreign "DnsFreeCustomServers"
    ((ptr uint32_t) @-> (ptr void) @-> returning void)
(* pcServers : DWORD* in/out -> (ptr uint32_t) *)
(* ppServers : DNS_CUSTOM_SERVER** 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 dnsapi (t "DNSAPI.dll"))
(cffi:use-foreign-library dnsapi)

(cffi:defcfun ("DnsFreeCustomServers" dns-free-custom-servers :convention :stdcall) :void
  (pc-servers :pointer)   ; DWORD* in/out
  (pp-servers :pointer))   ; DNS_CUSTOM_SERVER** in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $DnsFreeCustomServers = Win32::API::More->new('DNSAPI',
    'void DnsFreeCustomServers(LPVOID pcServers, LPVOID ppServers)');
# my $ret = $DnsFreeCustomServers->Call($pcServers, $ppServers);
# pcServers : DWORD* in/out -> LPVOID
# ppServers : DNS_CUSTOM_SERVER** 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。