SHEnumKeyExA

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

WIN32_ERROR SHEnumKeyExA(
    HKEY hkey,
    DWORD dwIndex,
    LPSTR pszName,
    DWORD* pcchName
);

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

' hkey : HKEY
' dwIndex : DWORD
' pszName : LPSTR out
' pcchName : DWORD* in/out
Declare PtrSafe Function SHEnumKeyExA Lib "shlwapi" ( _
    ByVal hkey As LongPtr, _
    ByVal dwIndex As Long, _
    ByVal pszName As String, _
    ByRef pcchName 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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHEnumKeyExA = Fiddle::Function.new(
  lib['SHEnumKeyExA'],
  [
    Fiddle::TYPE_VOIDP,  # hkey : HKEY
    -Fiddle::TYPE_INT,  # dwIndex : DWORD
    Fiddle::TYPE_VOIDP,  # pszName : LPSTR out
    Fiddle::TYPE_VOIDP,  # pcchName : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "shlwapi")]
extern "system" {
    fn SHEnumKeyExA(
        hkey: *mut core::ffi::c_void,  // HKEY
        dwIndex: u32,  // DWORD
        pszName: *mut u8,  // LPSTR out
        pcchName: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

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

#uselib "SHLWAPI.dll"
#func global SHEnumKeyExA "SHEnumKeyExA" sptr, sptr, sptr, sptr
; SHEnumKeyExA hkey, dwIndex, varptr(pszName), varptr(pcchName)   ; 戻り値は stat
; hkey : HKEY -> "sptr"
; dwIndex : DWORD -> "sptr"
; pszName : LPSTR out -> "sptr"
; pcchName : 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。

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHEnumKeyExA = shlwapi.NewProc("SHEnumKeyExA")
)

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

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

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

●SHEnumKeyExA(hkey, dwIndex, pszName, pcchName) = DLL("SHLWAPI.dll", "dword SHEnumKeyExA(void*, dword, char*, void*)")
# 呼び出し: SHEnumKeyExA(hkey, dwIndex, pszName, pcchName)
# hkey : HKEY -> "void*"
# dwIndex : DWORD -> "dword"
# pszName : LPSTR 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)。

const std = @import("std");

extern "shlwapi" fn SHEnumKeyExA(
    hkey: ?*anyopaque, // HKEY
    dwIndex: u32, // DWORD
    pszName: [*c]u8, // LPSTR out
    pcchName: [*c]u32 // DWORD* in/out
) callconv(std.os.windows.WINAPI) u32;

proc SHEnumKeyExA(
    hkey: pointer,  # HKEY
    dwIndex: uint32,  # DWORD
    pszName: ptr char,  # LPSTR out
    pcchName: ptr uint32  # DWORD* in/out
): uint32 {.importc: "SHEnumKeyExA", stdcall, dynlib: "SHLWAPI.dll".}

pragma(lib, "shlwapi");
extern(Windows)
uint SHEnumKeyExA(
    void* hkey,   // HKEY
    uint dwIndex,   // DWORD
    char* pszName,   // LPSTR out
    uint* pcchName   // DWORD* in/out
);

ccall((:SHEnumKeyExA, "SHLWAPI.dll"), stdcall, UInt32,
      (Ptr{Cvoid}, UInt32, Ptr{UInt8}, Ptr{UInt32}),
      hkey, dwIndex, pszName, pcchName)
# hkey : HKEY -> Ptr{Cvoid}
# dwIndex : DWORD -> UInt32
# pszName : LPSTR out -> Ptr{UInt8}
# pcchName : 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 SHEnumKeyExA(
    void* hkey,
    uint32_t dwIndex,
    char* pszName,
    uint32_t* pcchName);
]]
local shlwapi = ffi.load("shlwapi")
-- shlwapi.SHEnumKeyExA(hkey, dwIndex, pszName, pcchName)
-- hkey : HKEY
-- dwIndex : DWORD
-- pszName : LPSTR 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。

const koffi = require('koffi');
const lib = koffi.load('SHLWAPI.dll');
const SHEnumKeyExA = lib.func('__stdcall', 'SHEnumKeyExA', 'uint32_t', ['void *', 'uint32_t', 'char *', 'uint32_t *']);
// SHEnumKeyExA(hkey, dwIndex, pszName, pcchName)
// hkey : HKEY -> 'void *'
// dwIndex : DWORD -> 'uint32_t'
// pszName : LPSTR out -> 'char *'
// 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", {
  SHEnumKeyExA: { parameters: ["pointer", "u32", "buffer", "pointer"], result: "u32" },
});
// lib.symbols.SHEnumKeyExA(hkey, dwIndex, pszName, pcchName)
// hkey : HKEY -> "pointer"
// dwIndex : DWORD -> "u32"
// pszName : LPSTR out -> "buffer"
// pcchName : DWORD* in/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 SHEnumKeyExA(
    void* hkey,
    uint32_t dwIndex,
    char* pszName,
    uint32_t* pcchName);
C, "SHLWAPI.dll");
// $ffi->SHEnumKeyExA(hkey, dwIndex, pszName, pcchName);
// hkey : HKEY
// dwIndex : DWORD
// pszName : LPSTR 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.ASCII_OPTIONS);
    int SHEnumKeyExA(
        Pointer hkey,   // HKEY
        int dwIndex,   // DWORD
        byte[] pszName,   // LPSTR out
        IntByReference pcchName   // DWORD* in/out
    );
}

@[Link("shlwapi")]
lib LibSHLWAPI
  fun SHEnumKeyExA = SHEnumKeyExA(
    hkey : Void*,   # HKEY
    dwIndex : UInt32,   # DWORD
    pszName : UInt8*,   # LPSTR 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 SHEnumKeyExANative = Uint32 Function(Pointer<Void>, Uint32, Pointer<Utf8>, Pointer<Uint32>);
typedef SHEnumKeyExADart = int Function(Pointer<Void>, int, Pointer<Utf8>, Pointer<Uint32>);
final SHEnumKeyExA = DynamicLibrary.open('SHLWAPI.dll')
    .lookupFunction<SHEnumKeyExANative, SHEnumKeyExADart>('SHEnumKeyExA');
// hkey : HKEY -> Pointer<Void>
// dwIndex : DWORD -> Uint32
// pszName : LPSTR out -> Pointer<Utf8>
// pcchName : DWORD* in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

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

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

foreign import stdcall safe "SHEnumKeyExA"
  c_SHEnumKeyExA :: Ptr () -> Word32 -> CString -> Ptr Word32 -> IO Word32
-- hkey : HKEY -> Ptr ()
-- dwIndex : DWORD -> Word32
-- pszName : LPSTR out -> CString
-- 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 shenumkeyexa =
  foreign "SHEnumKeyExA"
    ((ptr void) @-> uint32_t @-> string @-> (ptr uint32_t) @-> returning uint32_t)
(* hkey : HKEY -> (ptr void) *)
(* dwIndex : DWORD -> uint32_t *)
(* pszName : LPSTR out -> string *)
(* 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 ("SHEnumKeyExA" shenum-key-ex-a :convention :stdcall) :uint32
  (hkey :pointer)   ; HKEY
  (dw-index :uint32)   ; DWORD
  (psz-name :pointer)   ; LPSTR 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 $SHEnumKeyExA = Win32::API::More->new('SHLWAPI',
    'DWORD SHEnumKeyExA(HANDLE hkey, DWORD dwIndex, LPSTR pszName, LPVOID pcchName)');
# my $ret = $SHEnumKeyExA->Call($hkey, $dwIndex, $pszName, $pcchName);
# hkey : HKEY -> HANDLE
# dwIndex : DWORD -> DWORD
# pszName : LPSTR out -> LPSTR
# 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。