RegOpenKeyExA

// ADVAPI32.dll  (ANSI / -A)
#include <windows.h>

WIN32_ERROR RegOpenKeyExA(
    HKEY hKey,
    LPCSTR lpSubKey,   // optional
    DWORD ulOptions,   // optional
    REG_SAM_FLAGS samDesired,
    HKEY* phkResult
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function RegOpenKeyExA(
    hKey As IntPtr,   ' HKEY
    <MarshalAs(UnmanagedType.LPStr)> lpSubKey As String,   ' LPCSTR optional
    ulOptions As UInteger,   ' DWORD optional
    samDesired As UInteger,   ' REG_SAM_FLAGS
    phkResult As IntPtr   ' HKEY* out
) As UInteger
End Function

' hKey : HKEY
' lpSubKey : LPCSTR optional
' ulOptions : DWORD optional
' samDesired : REG_SAM_FLAGS
' phkResult : HKEY* out
Declare PtrSafe Function RegOpenKeyExA Lib "advapi32" ( _
    ByVal hKey As LongPtr, _
    ByVal lpSubKey As String, _
    ByVal ulOptions As Long, _
    ByVal samDesired As Long, _
    ByVal phkResult 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

RegOpenKeyExA = ctypes.windll.advapi32.RegOpenKeyExA
RegOpenKeyExA.restype = wintypes.DWORD
RegOpenKeyExA.argtypes = [
    wintypes.HANDLE,  # hKey : HKEY
    wintypes.LPCSTR,  # lpSubKey : LPCSTR optional
    wintypes.DWORD,  # ulOptions : DWORD optional
    wintypes.DWORD,  # samDesired : REG_SAM_FLAGS
    ctypes.c_void_p,  # phkResult : HKEY* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
RegOpenKeyExA = Fiddle::Function.new(
  lib['RegOpenKeyExA'],
  [
    Fiddle::TYPE_VOIDP,  # hKey : HKEY
    Fiddle::TYPE_VOIDP,  # lpSubKey : LPCSTR optional
    -Fiddle::TYPE_INT,  # ulOptions : DWORD optional
    -Fiddle::TYPE_INT,  # samDesired : REG_SAM_FLAGS
    Fiddle::TYPE_VOIDP,  # phkResult : HKEY* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "advapi32")]
extern "system" {
    fn RegOpenKeyExA(
        hKey: *mut core::ffi::c_void,  // HKEY
        lpSubKey: *const u8,  // LPCSTR optional
        ulOptions: u32,  // DWORD optional
        samDesired: u32,  // REG_SAM_FLAGS
        phkResult: *mut *mut core::ffi::c_void  // HKEY* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi)]
public static extern uint RegOpenKeyExA(IntPtr hKey, [MarshalAs(UnmanagedType.LPStr)] string lpSubKey, uint ulOptions, uint samDesired, IntPtr phkResult);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_RegOpenKeyExA' -Namespace Win32 -PassThru
# $api::RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult)

#uselib "ADVAPI32.dll"
#func global RegOpenKeyExA "RegOpenKeyExA" sptr, sptr, sptr, sptr, sptr
; RegOpenKeyExA hKey, lpSubKey, ulOptions, samDesired, phkResult   ; 戻り値は stat
; hKey : HKEY -> "sptr"
; lpSubKey : LPCSTR optional -> "sptr"
; ulOptions : DWORD optional -> "sptr"
; samDesired : REG_SAM_FLAGS -> "sptr"
; phkResult : HKEY* 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。

#uselib "ADVAPI32.dll"
#cfunc global RegOpenKeyExA "RegOpenKeyExA" sptr, str, int, int, sptr
; res = RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult)
; hKey : HKEY -> "sptr"
; lpSubKey : LPCSTR optional -> "str"
; ulOptions : DWORD optional -> "int"
; samDesired : REG_SAM_FLAGS -> "int"
; phkResult : HKEY* out -> "sptr"

; WIN32_ERROR RegOpenKeyExA(HKEY hKey, LPCSTR lpSubKey, DWORD ulOptions, REG_SAM_FLAGS samDesired, HKEY* phkResult)
#uselib "ADVAPI32.dll"
#cfunc global RegOpenKeyExA "RegOpenKeyExA" intptr, str, int, int, intptr
; res = RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult)
; hKey : HKEY -> "intptr"
; lpSubKey : LPCSTR optional -> "str"
; ulOptions : DWORD optional -> "int"
; samDesired : REG_SAM_FLAGS -> "int"
; phkResult : HKEY* out -> "intptr"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procRegOpenKeyExA = advapi32.NewProc("RegOpenKeyExA")
)

// hKey (HKEY), lpSubKey (LPCSTR optional), ulOptions (DWORD optional), samDesired (REG_SAM_FLAGS), phkResult (HKEY* out)
r1, _, err := procRegOpenKeyExA.Call(
	uintptr(hKey),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpSubKey))),
	uintptr(ulOptions),
	uintptr(samDesired),
	uintptr(phkResult),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function RegOpenKeyExA(
  hKey: THandle;   // HKEY
  lpSubKey: PAnsiChar;   // LPCSTR optional
  ulOptions: DWORD;   // DWORD optional
  samDesired: DWORD;   // REG_SAM_FLAGS
  phkResult: Pointer   // HKEY* out
): DWORD; stdcall;
  external 'ADVAPI32.dll' name 'RegOpenKeyExA';

result := DllCall("ADVAPI32\RegOpenKeyExA"
    , "Ptr", hKey   ; HKEY
    , "AStr", lpSubKey   ; LPCSTR optional
    , "UInt", ulOptions   ; DWORD optional
    , "UInt", samDesired   ; REG_SAM_FLAGS
    , "Ptr", phkResult   ; HKEY* out
    , "UInt")   ; return: WIN32_ERROR

●RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult) = DLL("ADVAPI32.dll", "dword RegOpenKeyExA(void*, char*, dword, dword, void*)")
# 呼び出し: RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult)
# hKey : HKEY -> "void*"
# lpSubKey : LPCSTR optional -> "char*"
# ulOptions : DWORD optional -> "dword"
# samDesired : REG_SAM_FLAGS -> "dword"
# phkResult : HKEY* 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 "advapi32" fn RegOpenKeyExA(
    hKey: ?*anyopaque, // HKEY
    lpSubKey: [*c]const u8, // LPCSTR optional
    ulOptions: u32, // DWORD optional
    samDesired: u32, // REG_SAM_FLAGS
    phkResult: ?*anyopaque // HKEY* out
) callconv(std.os.windows.WINAPI) u32;

proc RegOpenKeyExA(
    hKey: pointer,  # HKEY
    lpSubKey: cstring,  # LPCSTR optional
    ulOptions: uint32,  # DWORD optional
    samDesired: uint32,  # REG_SAM_FLAGS
    phkResult: pointer  # HKEY* out
): uint32 {.importc: "RegOpenKeyExA", stdcall, dynlib: "ADVAPI32.dll".}

pragma(lib, "advapi32");
extern(Windows)
uint RegOpenKeyExA(
    void* hKey,   // HKEY
    const(char)* lpSubKey,   // LPCSTR optional
    uint ulOptions,   // DWORD optional
    uint samDesired,   // REG_SAM_FLAGS
    void* phkResult   // HKEY* out
);

ccall((:RegOpenKeyExA, "ADVAPI32.dll"), stdcall, UInt32,
      (Ptr{Cvoid}, Cstring, UInt32, UInt32, Ptr{Cvoid}),
      hKey, lpSubKey, ulOptions, samDesired, phkResult)
# hKey : HKEY -> Ptr{Cvoid}
# lpSubKey : LPCSTR optional -> Cstring
# ulOptions : DWORD optional -> UInt32
# samDesired : REG_SAM_FLAGS -> UInt32
# phkResult : HKEY* out -> Ptr{Cvoid}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t RegOpenKeyExA(
    void* hKey,
    const char* lpSubKey,
    uint32_t ulOptions,
    uint32_t samDesired,
    void* phkResult);
]]
local advapi32 = ffi.load("advapi32")
-- advapi32.RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult)
-- hKey : HKEY
-- lpSubKey : LPCSTR optional
-- ulOptions : DWORD optional
-- samDesired : REG_SAM_FLAGS
-- phkResult : HKEY* 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('ADVAPI32.dll');
const RegOpenKeyExA = lib.func('__stdcall', 'RegOpenKeyExA', 'uint32_t', ['void *', 'str', 'uint32_t', 'uint32_t', 'void *']);
// RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult)
// hKey : HKEY -> 'void *'
// lpSubKey : LPCSTR optional -> 'str'
// ulOptions : DWORD optional -> 'uint32_t'
// samDesired : REG_SAM_FLAGS -> 'uint32_t'
// phkResult : HKEY* 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("ADVAPI32.dll", {
  RegOpenKeyExA: { parameters: ["pointer", "buffer", "u32", "u32", "pointer"], result: "u32" },
});
// lib.symbols.RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult)
// hKey : HKEY -> "pointer"
// lpSubKey : LPCSTR optional -> "buffer"
// ulOptions : DWORD optional -> "u32"
// samDesired : REG_SAM_FLAGS -> "u32"
// phkResult : HKEY* out -> "pointer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
uint32_t RegOpenKeyExA(
    void* hKey,
    const char* lpSubKey,
    uint32_t ulOptions,
    uint32_t samDesired,
    void* phkResult);
C, "ADVAPI32.dll");
// $ffi->RegOpenKeyExA(hKey, lpSubKey, ulOptions, samDesired, phkResult);
// hKey : HKEY
// lpSubKey : LPCSTR optional
// ulOptions : DWORD optional
// samDesired : REG_SAM_FLAGS
// phkResult : HKEY* 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 Advapi32 extends StdCallLibrary {
    Advapi32 INSTANCE = Native.load("advapi32", Advapi32.class, W32APIOptions.ASCII_OPTIONS);
    int RegOpenKeyExA(
        Pointer hKey,   // HKEY
        String lpSubKey,   // LPCSTR optional
        int ulOptions,   // DWORD optional
        int samDesired,   // REG_SAM_FLAGS
        Pointer phkResult   // HKEY* out
    );
}

@[Link("advapi32")]
lib LibADVAPI32
  fun RegOpenKeyExA = RegOpenKeyExA(
    hKey : Void*,   # HKEY
    lpSubKey : UInt8*,   # LPCSTR optional
    ulOptions : UInt32,   # DWORD optional
    samDesired : UInt32,   # REG_SAM_FLAGS
    phkResult : Void*   # HKEY* 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 RegOpenKeyExANative = Uint32 Function(Pointer<Void>, Pointer<Utf8>, Uint32, Uint32, Pointer<Void>);
typedef RegOpenKeyExADart = int Function(Pointer<Void>, Pointer<Utf8>, int, int, Pointer<Void>);
final RegOpenKeyExA = DynamicLibrary.open('ADVAPI32.dll')
    .lookupFunction<RegOpenKeyExANative, RegOpenKeyExADart>('RegOpenKeyExA');
// hKey : HKEY -> Pointer<Void>
// lpSubKey : LPCSTR optional -> Pointer<Utf8>
// ulOptions : DWORD optional -> Uint32
// samDesired : REG_SAM_FLAGS -> Uint32
// phkResult : HKEY* out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function RegOpenKeyExA(
  hKey: THandle;   // HKEY
  lpSubKey: PAnsiChar;   // LPCSTR optional
  ulOptions: DWORD;   // DWORD optional
  samDesired: DWORD;   // REG_SAM_FLAGS
  phkResult: Pointer   // HKEY* out
): DWORD; stdcall;
  external 'ADVAPI32.dll' name 'RegOpenKeyExA';

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

foreign import stdcall safe "RegOpenKeyExA"
  c_RegOpenKeyExA :: Ptr () -> CString -> Word32 -> Word32 -> Ptr () -> IO Word32
-- hKey : HKEY -> Ptr ()
-- lpSubKey : LPCSTR optional -> CString
-- ulOptions : DWORD optional -> Word32
-- samDesired : REG_SAM_FLAGS -> Word32
-- phkResult : HKEY* 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 regopenkeyexa =
  foreign "RegOpenKeyExA"
    ((ptr void) @-> string @-> uint32_t @-> uint32_t @-> (ptr void) @-> returning uint32_t)
(* hKey : HKEY -> (ptr void) *)
(* lpSubKey : LPCSTR optional -> string *)
(* ulOptions : DWORD optional -> uint32_t *)
(* samDesired : REG_SAM_FLAGS -> uint32_t *)
(* phkResult : HKEY* 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 advapi32 (t "ADVAPI32.dll"))
(cffi:use-foreign-library advapi32)

(cffi:defcfun ("RegOpenKeyExA" reg-open-key-ex-a :convention :stdcall) :uint32
  (h-key :pointer)   ; HKEY
  (lp-sub-key :string)   ; LPCSTR optional
  (ul-options :uint32)   ; DWORD optional
  (sam-desired :uint32)   ; REG_SAM_FLAGS
  (phk-result :pointer))   ; HKEY* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $RegOpenKeyExA = Win32::API::More->new('ADVAPI32',
    'DWORD RegOpenKeyExA(HANDLE hKey, LPCSTR lpSubKey, DWORD ulOptions, DWORD samDesired, HANDLE phkResult)');
# my $ret = $RegOpenKeyExA->Call($hKey, $lpSubKey, $ulOptions, $samDesired, $phkResult);
# hKey : HKEY -> HANDLE
# lpSubKey : LPCSTR optional -> LPCSTR
# ulOptions : DWORD optional -> DWORD
# samDesired : REG_SAM_FLAGS -> DWORD
# phkResult : HKEY* out -> HANDLE
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。