SHEnumKeyExW

// SHLWAPI.dll  (Unicode / -W)
#include <windows.h>

WIN32_ERROR SHEnumKeyExW(
    HKEY hkey,
    DWORD dwIndex,
    LPWSTR pszName,
    DWORD* pcchName
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SHEnumKeyExW(
    hkey As IntPtr,   ' HKEY
    dwIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pszName As System.Text.StringBuilder,   ' LPWSTR out
    ByRef pcchName As UInteger   ' DWORD* in/out
) As UInteger
End Function

' hkey : HKEY
' dwIndex : DWORD
' pszName : LPWSTR out
' pcchName : DWORD* in/out
Declare PtrSafe Function SHEnumKeyExW Lib "shlwapi" ( _
    ByVal hkey As LongPtr, _
    ByVal dwIndex As Long, _
    ByVal pszName As LongPtr, _
    ByRef pcchName As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SHEnumKeyExW = ctypes.windll.shlwapi.SHEnumKeyExW
SHEnumKeyExW.restype = wintypes.DWORD
SHEnumKeyExW.argtypes = [
    wintypes.HANDLE,  # hkey : HKEY
    wintypes.DWORD,  # dwIndex : DWORD
    wintypes.LPWSTR,  # pszName : LPWSTR out
    ctypes.POINTER(wintypes.DWORD),  # pcchName : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHEnumKeyExW = Fiddle::Function.new(
  lib['SHEnumKeyExW'],
  [
    Fiddle::TYPE_VOIDP,  # hkey : HKEY
    -Fiddle::TYPE_INT,  # dwIndex : DWORD
    Fiddle::TYPE_VOIDP,  # pszName : LPWSTR out
    Fiddle::TYPE_VOIDP,  # pcchName : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shlwapi")]
extern "system" {
    fn SHEnumKeyExW(
        hkey: *mut core::ffi::c_void,  // HKEY
        dwIndex: u32,  // DWORD
        pszName: *mut u16,  // LPWSTR out
        pcchName: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Unicode)]
public static extern uint SHEnumKeyExW(IntPtr hkey, uint dwIndex, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszName, ref uint pcchName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHEnumKeyExW' -Namespace Win32 -PassThru
# $api::SHEnumKeyExW(hkey, dwIndex, pszName, pcchName)

#uselib "SHLWAPI.dll"
#func global SHEnumKeyExW "SHEnumKeyExW" wptr, wptr, wptr, wptr
; SHEnumKeyExW hkey, dwIndex, varptr(pszName), varptr(pcchName)   ; 戻り値は stat
; hkey : HKEY -> "wptr"
; dwIndex : DWORD -> "wptr"
; pszName : LPWSTR out -> "wptr"
; pcchName : DWORD* in/out -> "wptr"
; ※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 (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHEnumKeyExW = shlwapi.NewProc("SHEnumKeyExW")
)

// hkey (HKEY), dwIndex (DWORD), pszName (LPWSTR out), pcchName (DWORD* in/out)
r1, _, err := procSHEnumKeyExW.Call(
	uintptr(hkey),
	uintptr(dwIndex),
	uintptr(pszName),
	uintptr(pcchName),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function SHEnumKeyExW(
  hkey: THandle;   // HKEY
  dwIndex: DWORD;   // DWORD
  pszName: PWideChar;   // LPWSTR out
  pcchName: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'SHLWAPI.dll' name 'SHEnumKeyExW';

result := DllCall("SHLWAPI\SHEnumKeyExW"
    , "Ptr", hkey   ; HKEY
    , "UInt", dwIndex   ; DWORD
    , "Ptr", pszName   ; LPWSTR out
    , "Ptr", pcchName   ; DWORD* in/out
    , "UInt")   ; return: WIN32_ERROR

●SHEnumKeyExW(hkey, dwIndex, pszName, pcchName) = DLL("SHLWAPI.dll", "dword SHEnumKeyExW(void*, dword, char*, void*)")
# 呼び出し: SHEnumKeyExW(hkey, dwIndex, pszName, pcchName)
# hkey : HKEY -> "void*"
# dwIndex : DWORD -> "dword"
# pszName : LPWSTR out -> "char*"
# pcchName : 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。

const std = @import("std");

extern "shlwapi" fn SHEnumKeyExW(
    hkey: ?*anyopaque, // HKEY
    dwIndex: u32, // DWORD
    pszName: [*c]u16, // LPWSTR out
    pcchName: [*c]u32 // DWORD* in/out
) callconv(std.os.windows.WINAPI) u32;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc SHEnumKeyExW(
    hkey: pointer,  # HKEY
    dwIndex: uint32,  # DWORD
    pszName: ptr uint16,  # LPWSTR out
    pcchName: ptr uint32  # DWORD* in/out
): uint32 {.importc: "SHEnumKeyExW", stdcall, dynlib: "SHLWAPI.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "shlwapi");
extern(Windows)
uint SHEnumKeyExW(
    void* hkey,   // HKEY
    uint dwIndex,   // DWORD
    wchar* pszName,   // LPWSTR out
    uint* pcchName   // DWORD* in/out
);

ccall((:SHEnumKeyExW, "SHLWAPI.dll"), stdcall, UInt32,
      (Ptr{Cvoid}, UInt32, Ptr{UInt16}, Ptr{UInt32}),
      hkey, dwIndex, pszName, pcchName)
# hkey : HKEY -> Ptr{Cvoid}
# dwIndex : DWORD -> UInt32
# pszName : LPWSTR out -> Ptr{UInt16}
# pcchName : DWORD* in/out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
uint32_t SHEnumKeyExW(
    void* hkey,
    uint32_t dwIndex,
    uint16_t* pszName,
    uint32_t* pcchName);
]]
local shlwapi = ffi.load("shlwapi")
-- shlwapi.SHEnumKeyExW(hkey, dwIndex, pszName, pcchName)
-- hkey : HKEY
-- dwIndex : DWORD
-- pszName : LPWSTR out
-- pcchName : 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。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('SHLWAPI.dll');
const SHEnumKeyExW = lib.func('__stdcall', 'SHEnumKeyExW', 'uint32_t', ['void *', 'uint32_t', 'uint16_t *', 'uint32_t *']);
// SHEnumKeyExW(hkey, dwIndex, pszName, pcchName)
// hkey : HKEY -> 'void *'
// dwIndex : DWORD -> 'uint32_t'
// pszName : LPWSTR out -> 'uint16_t *'
// pcchName : 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("SHLWAPI.dll", {
  SHEnumKeyExW: { parameters: ["pointer", "u32", "buffer", "pointer"], result: "u32" },
});
// lib.symbols.SHEnumKeyExW(hkey, dwIndex, pszName, pcchName)
// hkey : HKEY -> "pointer"
// dwIndex : DWORD -> "u32"
// pszName : LPWSTR out -> "buffer"
// pcchName : DWORD* in/out -> "pointer"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)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 SHEnumKeyExW(
    void* hkey,
    uint32_t dwIndex,
    uint16_t* pszName,
    uint32_t* pcchName);
C, "SHLWAPI.dll");
// $ffi->SHEnumKeyExW(hkey, dwIndex, pszName, pcchName);
// hkey : HKEY
// dwIndex : DWORD
// pszName : LPWSTR out
// pcchName : 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 Shlwapi extends StdCallLibrary {
    Shlwapi INSTANCE = Native.load("shlwapi", Shlwapi.class, W32APIOptions.UNICODE_OPTIONS);
    int SHEnumKeyExW(
        Pointer hkey,   // HKEY
        int dwIndex,   // DWORD
        char[] pszName,   // LPWSTR out
        IntByReference pcchName   // DWORD* in/out
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("shlwapi")]
lib LibSHLWAPI
  fun SHEnumKeyExW = SHEnumKeyExW(
    hkey : Void*,   # HKEY
    dwIndex : UInt32,   # DWORD
    pszName : UInt16*,   # LPWSTR out
    pcchName : 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 SHEnumKeyExWNative = Uint32 Function(Pointer<Void>, Uint32, Pointer<Utf16>, Pointer<Uint32>);
typedef SHEnumKeyExWDart = int Function(Pointer<Void>, int, Pointer<Utf16>, Pointer<Uint32>);
final SHEnumKeyExW = DynamicLibrary.open('SHLWAPI.dll')
    .lookupFunction<SHEnumKeyExWNative, SHEnumKeyExWDart>('SHEnumKeyExW');
// hkey : HKEY -> Pointer<Void>
// dwIndex : DWORD -> Uint32
// pszName : LPWSTR out -> Pointer<Utf16>
// pcchName : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SHEnumKeyExW(
  hkey: THandle;   // HKEY
  dwIndex: DWORD;   // DWORD
  pszName: PWideChar;   // LPWSTR out
  pcchName: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'SHLWAPI.dll' name 'SHEnumKeyExW';

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

foreign import stdcall safe "SHEnumKeyExW"
  c_SHEnumKeyExW :: Ptr () -> Word32 -> CWString -> Ptr Word32 -> IO Word32
-- hkey : HKEY -> Ptr ()
-- dwIndex : DWORD -> Word32
-- pszName : LPWSTR out -> CWString
-- pcchName : 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 shenumkeyexw =
  foreign "SHEnumKeyExW"
    ((ptr void) @-> uint32_t @-> (ptr uint16_t) @-> (ptr uint32_t) @-> returning uint32_t)
(* hkey : HKEY -> (ptr void) *)
(* dwIndex : DWORD -> uint32_t *)
(* pszName : LPWSTR out -> (ptr uint16_t) *)
(* pcchName : 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 shlwapi (t "SHLWAPI.dll"))
(cffi:use-foreign-library shlwapi)

(cffi:defcfun ("SHEnumKeyExW" shenum-key-ex-w :convention :stdcall) :uint32
  (hkey :pointer)   ; HKEY
  (dw-index :uint32)   ; DWORD
  (psz-name :pointer)   ; LPWSTR out
  (pcch-name :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 $SHEnumKeyExW = Win32::API::More->new('SHLWAPI',
    'DWORD SHEnumKeyExW(HANDLE hkey, DWORD dwIndex, LPWSTR pszName, LPVOID pcchName)');
# my $ret = $SHEnumKeyExW->Call($hkey, $dwIndex, $pszName, $pcchName);
# hkey : HKEY -> HANDLE
# dwIndex : DWORD -> DWORD
# pszName : LPWSTR out -> LPWSTR
# pcchName : 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。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。