GetRegistryValueWithFallbackW

// api-ms-win-core-state-helpers-l1-1-0.dll
#include <windows.h>

WIN32_ERROR GetRegistryValueWithFallbackW(
    HKEY hkeyPrimary,   // optional
    LPCWSTR pwszPrimarySubKey,   // optional
    HKEY hkeyFallback,   // optional
    LPCWSTR pwszFallbackSubKey,   // optional
    LPCWSTR pwszValue,
    DWORD dwFlags,
    DWORD* pdwType,   // optional
    void* pvData,   // optional
    DWORD cbDataIn,
    DWORD* pcbDataOut   // optional
);

<DllImport("api-ms-win-core-state-helpers-l1-1-0.dll", ExactSpelling:=True)>
Public Shared Function GetRegistryValueWithFallbackW(
    hkeyPrimary As IntPtr,   ' HKEY optional
    <MarshalAs(UnmanagedType.LPWStr)> pwszPrimarySubKey As String,   ' LPCWSTR optional
    hkeyFallback As IntPtr,   ' HKEY optional
    <MarshalAs(UnmanagedType.LPWStr)> pwszFallbackSubKey As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pwszValue As String,   ' LPCWSTR
    dwFlags As UInteger,   ' DWORD
    pdwType As IntPtr,   ' DWORD* optional, out
    pvData As IntPtr,   ' void* optional, out
    cbDataIn As UInteger,   ' DWORD
    pcbDataOut As IntPtr   ' DWORD* optional, out
) As UInteger
End Function

' hkeyPrimary : HKEY optional
' pwszPrimarySubKey : LPCWSTR optional
' hkeyFallback : HKEY optional
' pwszFallbackSubKey : LPCWSTR optional
' pwszValue : LPCWSTR
' dwFlags : DWORD
' pdwType : DWORD* optional, out
' pvData : void* optional, out
' cbDataIn : DWORD
' pcbDataOut : DWORD* optional, out
Declare PtrSafe Function GetRegistryValueWithFallbackW Lib "api-ms-win-core-state-helpers-l1-1-0" ( _
    ByVal hkeyPrimary As LongPtr, _
    ByVal pwszPrimarySubKey As LongPtr, _
    ByVal hkeyFallback As LongPtr, _
    ByVal pwszFallbackSubKey As LongPtr, _
    ByVal pwszValue As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal pdwType As LongPtr, _
    ByVal pvData As LongPtr, _
    ByVal cbDataIn As Long, _
    ByVal pcbDataOut 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

GetRegistryValueWithFallbackW = ctypes.windll.LoadLibrary("api-ms-win-core-state-helpers-l1-1-0.dll").GetRegistryValueWithFallbackW
GetRegistryValueWithFallbackW.restype = wintypes.DWORD
GetRegistryValueWithFallbackW.argtypes = [
    wintypes.HANDLE,  # hkeyPrimary : HKEY optional
    wintypes.LPCWSTR,  # pwszPrimarySubKey : LPCWSTR optional
    wintypes.HANDLE,  # hkeyFallback : HKEY optional
    wintypes.LPCWSTR,  # pwszFallbackSubKey : LPCWSTR optional
    wintypes.LPCWSTR,  # pwszValue : LPCWSTR
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pdwType : DWORD* optional, out
    ctypes.POINTER(None),  # pvData : void* optional, out
    wintypes.DWORD,  # cbDataIn : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbDataOut : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('api-ms-win-core-state-helpers-l1-1-0.dll')
GetRegistryValueWithFallbackW = Fiddle::Function.new(
  lib['GetRegistryValueWithFallbackW'],
  [
    Fiddle::TYPE_VOIDP,  # hkeyPrimary : HKEY optional
    Fiddle::TYPE_VOIDP,  # pwszPrimarySubKey : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # hkeyFallback : HKEY optional
    Fiddle::TYPE_VOIDP,  # pwszFallbackSubKey : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pwszValue : LPCWSTR
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pdwType : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # pvData : void* optional, out
    -Fiddle::TYPE_INT,  # cbDataIn : DWORD
    Fiddle::TYPE_VOIDP,  # pcbDataOut : DWORD* optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "api-ms-win-core-state-helpers-l1-1-0")]
extern "system" {
    fn GetRegistryValueWithFallbackW(
        hkeyPrimary: *mut core::ffi::c_void,  // HKEY optional
        pwszPrimarySubKey: *const u16,  // LPCWSTR optional
        hkeyFallback: *mut core::ffi::c_void,  // HKEY optional
        pwszFallbackSubKey: *const u16,  // LPCWSTR optional
        pwszValue: *const u16,  // LPCWSTR
        dwFlags: u32,  // DWORD
        pdwType: *mut u32,  // DWORD* optional, out
        pvData: *mut (),  // void* optional, out
        cbDataIn: u32,  // DWORD
        pcbDataOut: *mut u32  // DWORD* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("api-ms-win-core-state-helpers-l1-1-0.dll")]
public static extern uint GetRegistryValueWithFallbackW(IntPtr hkeyPrimary, [MarshalAs(UnmanagedType.LPWStr)] string pwszPrimarySubKey, IntPtr hkeyFallback, [MarshalAs(UnmanagedType.LPWStr)] string pwszFallbackSubKey, [MarshalAs(UnmanagedType.LPWStr)] string pwszValue, uint dwFlags, IntPtr pdwType, IntPtr pvData, uint cbDataIn, IntPtr pcbDataOut);
"@
$api = Add-Type -MemberDefinition $sig -Name 'api-ms-win-core-state-helpers-l1-1-0_GetRegistryValueWithFallbackW' -Namespace Win32 -PassThru
# $api::GetRegistryValueWithFallbackW(hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut)

#uselib "api-ms-win-core-state-helpers-l1-1-0.dll"
#func global GetRegistryValueWithFallbackW "GetRegistryValueWithFallbackW" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; GetRegistryValueWithFallbackW hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, varptr(pdwType), pvData, cbDataIn, varptr(pcbDataOut)   ; 戻り値は stat
; hkeyPrimary : HKEY optional -> "sptr"
; pwszPrimarySubKey : LPCWSTR optional -> "sptr"
; hkeyFallback : HKEY optional -> "sptr"
; pwszFallbackSubKey : LPCWSTR optional -> "sptr"
; pwszValue : LPCWSTR -> "sptr"
; dwFlags : DWORD -> "sptr"
; pdwType : DWORD* optional, out -> "sptr"
; pvData : void* optional, out -> "sptr"
; cbDataIn : DWORD -> "sptr"
; pcbDataOut : DWORD* optional, 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 (
	api_ms_win_core_state_helpers_l1_1_0 = windows.NewLazySystemDLL("api-ms-win-core-state-helpers-l1-1-0.dll")
	procGetRegistryValueWithFallbackW = api_ms_win_core_state_helpers_l1_1_0.NewProc("GetRegistryValueWithFallbackW")
)

// hkeyPrimary (HKEY optional), pwszPrimarySubKey (LPCWSTR optional), hkeyFallback (HKEY optional), pwszFallbackSubKey (LPCWSTR optional), pwszValue (LPCWSTR), dwFlags (DWORD), pdwType (DWORD* optional, out), pvData (void* optional, out), cbDataIn (DWORD), pcbDataOut (DWORD* optional, out)
r1, _, err := procGetRegistryValueWithFallbackW.Call(
	uintptr(hkeyPrimary),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwszPrimarySubKey))),
	uintptr(hkeyFallback),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwszFallbackSubKey))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwszValue))),
	uintptr(dwFlags),
	uintptr(pdwType),
	uintptr(pvData),
	uintptr(cbDataIn),
	uintptr(pcbDataOut),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function GetRegistryValueWithFallbackW(
  hkeyPrimary: THandle;   // HKEY optional
  pwszPrimarySubKey: PWideChar;   // LPCWSTR optional
  hkeyFallback: THandle;   // HKEY optional
  pwszFallbackSubKey: PWideChar;   // LPCWSTR optional
  pwszValue: PWideChar;   // LPCWSTR
  dwFlags: DWORD;   // DWORD
  pdwType: Pointer;   // DWORD* optional, out
  pvData: Pointer;   // void* optional, out
  cbDataIn: DWORD;   // DWORD
  pcbDataOut: Pointer   // DWORD* optional, out
): DWORD; stdcall;
  external 'api-ms-win-core-state-helpers-l1-1-0.dll' name 'GetRegistryValueWithFallbackW';

result := DllCall("api-ms-win-core-state-helpers-l1-1-0\GetRegistryValueWithFallbackW"
    , "Ptr", hkeyPrimary   ; HKEY optional
    , "WStr", pwszPrimarySubKey   ; LPCWSTR optional
    , "Ptr", hkeyFallback   ; HKEY optional
    , "WStr", pwszFallbackSubKey   ; LPCWSTR optional
    , "WStr", pwszValue   ; LPCWSTR
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pdwType   ; DWORD* optional, out
    , "Ptr", pvData   ; void* optional, out
    , "UInt", cbDataIn   ; DWORD
    , "Ptr", pcbDataOut   ; DWORD* optional, out
    , "UInt")   ; return: WIN32_ERROR

●GetRegistryValueWithFallbackW(hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut) = DLL("api-ms-win-core-state-helpers-l1-1-0.dll", "dword GetRegistryValueWithFallbackW(void*, char*, void*, char*, char*, dword, void*, void*, dword, void*)")
# 呼び出し: GetRegistryValueWithFallbackW(hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut)
# hkeyPrimary : HKEY optional -> "void*"
# pwszPrimarySubKey : LPCWSTR optional -> "char*"
# hkeyFallback : HKEY optional -> "void*"
# pwszFallbackSubKey : LPCWSTR optional -> "char*"
# pwszValue : LPCWSTR -> "char*"
# dwFlags : DWORD -> "dword"
# pdwType : DWORD* optional, out -> "void*"
# pvData : void* optional, out -> "void*"
# cbDataIn : DWORD -> "dword"
# pcbDataOut : DWORD* optional, 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 "api-ms-win-core-state-helpers-l1-1-0" fn GetRegistryValueWithFallbackW(
    hkeyPrimary: ?*anyopaque, // HKEY optional
    pwszPrimarySubKey: [*c]const u16, // LPCWSTR optional
    hkeyFallback: ?*anyopaque, // HKEY optional
    pwszFallbackSubKey: [*c]const u16, // LPCWSTR optional
    pwszValue: [*c]const u16, // LPCWSTR
    dwFlags: u32, // DWORD
    pdwType: [*c]u32, // DWORD* optional, out
    pvData: ?*anyopaque, // void* optional, out
    cbDataIn: u32, // DWORD
    pcbDataOut: [*c]u32 // DWORD* optional, out
) callconv(std.os.windows.WINAPI) u32;

proc GetRegistryValueWithFallbackW(
    hkeyPrimary: pointer,  # HKEY optional
    pwszPrimarySubKey: WideCString,  # LPCWSTR optional
    hkeyFallback: pointer,  # HKEY optional
    pwszFallbackSubKey: WideCString,  # LPCWSTR optional
    pwszValue: WideCString,  # LPCWSTR
    dwFlags: uint32,  # DWORD
    pdwType: ptr uint32,  # DWORD* optional, out
    pvData: pointer,  # void* optional, out
    cbDataIn: uint32,  # DWORD
    pcbDataOut: ptr uint32  # DWORD* optional, out
): uint32 {.importc: "GetRegistryValueWithFallbackW", stdcall, dynlib: "api-ms-win-core-state-helpers-l1-1-0.dll".}

pragma(lib, "api-ms-win-core-state-helpers-l1-1-0");
extern(Windows)
uint GetRegistryValueWithFallbackW(
    void* hkeyPrimary,   // HKEY optional
    const(wchar)* pwszPrimarySubKey,   // LPCWSTR optional
    void* hkeyFallback,   // HKEY optional
    const(wchar)* pwszFallbackSubKey,   // LPCWSTR optional
    const(wchar)* pwszValue,   // LPCWSTR
    uint dwFlags,   // DWORD
    uint* pdwType,   // DWORD* optional, out
    void* pvData,   // void* optional, out
    uint cbDataIn,   // DWORD
    uint* pcbDataOut   // DWORD* optional, out
);

ccall((:GetRegistryValueWithFallbackW, "api-ms-win-core-state-helpers-l1-1-0.dll"), stdcall, UInt32,
      (Ptr{Cvoid}, Cwstring, Ptr{Cvoid}, Cwstring, Cwstring, UInt32, Ptr{UInt32}, Ptr{Cvoid}, UInt32, Ptr{UInt32}),
      hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut)
# hkeyPrimary : HKEY optional -> Ptr{Cvoid}
# pwszPrimarySubKey : LPCWSTR optional -> Cwstring
# hkeyFallback : HKEY optional -> Ptr{Cvoid}
# pwszFallbackSubKey : LPCWSTR optional -> Cwstring
# pwszValue : LPCWSTR -> Cwstring
# dwFlags : DWORD -> UInt32
# pdwType : DWORD* optional, out -> Ptr{UInt32}
# pvData : void* optional, out -> Ptr{Cvoid}
# cbDataIn : DWORD -> UInt32
# pcbDataOut : DWORD* optional, 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 GetRegistryValueWithFallbackW(
    void* hkeyPrimary,
    const uint16_t* pwszPrimarySubKey,
    void* hkeyFallback,
    const uint16_t* pwszFallbackSubKey,
    const uint16_t* pwszValue,
    uint32_t dwFlags,
    uint32_t* pdwType,
    void* pvData,
    uint32_t cbDataIn,
    uint32_t* pcbDataOut);
]]
local api-ms-win-core-state-helpers-l1-1-0 = ffi.load("api-ms-win-core-state-helpers-l1-1-0")
-- api-ms-win-core-state-helpers-l1-1-0.GetRegistryValueWithFallbackW(hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut)
-- hkeyPrimary : HKEY optional
-- pwszPrimarySubKey : LPCWSTR optional
-- hkeyFallback : HKEY optional
-- pwszFallbackSubKey : LPCWSTR optional
-- pwszValue : LPCWSTR
-- dwFlags : DWORD
-- pdwType : DWORD* optional, out
-- pvData : void* optional, out
-- cbDataIn : DWORD
-- pcbDataOut : DWORD* optional, 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('api-ms-win-core-state-helpers-l1-1-0.dll');
const GetRegistryValueWithFallbackW = lib.func('__stdcall', 'GetRegistryValueWithFallbackW', 'uint32_t', ['void *', 'str16', 'void *', 'str16', 'str16', 'uint32_t', 'uint32_t *', 'void *', 'uint32_t', 'uint32_t *']);
// GetRegistryValueWithFallbackW(hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut)
// hkeyPrimary : HKEY optional -> 'void *'
// pwszPrimarySubKey : LPCWSTR optional -> 'str16'
// hkeyFallback : HKEY optional -> 'void *'
// pwszFallbackSubKey : LPCWSTR optional -> 'str16'
// pwszValue : LPCWSTR -> 'str16'
// dwFlags : DWORD -> 'uint32_t'
// pdwType : DWORD* optional, out -> 'uint32_t *'
// pvData : void* optional, out -> 'void *'
// cbDataIn : DWORD -> 'uint32_t'
// pcbDataOut : DWORD* optional, 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("api-ms-win-core-state-helpers-l1-1-0.dll", {
  GetRegistryValueWithFallbackW: { parameters: ["pointer", "buffer", "pointer", "buffer", "buffer", "u32", "pointer", "pointer", "u32", "pointer"], result: "u32" },
});
// lib.symbols.GetRegistryValueWithFallbackW(hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut)
// hkeyPrimary : HKEY optional -> "pointer"
// pwszPrimarySubKey : LPCWSTR optional -> "buffer"
// hkeyFallback : HKEY optional -> "pointer"
// pwszFallbackSubKey : LPCWSTR optional -> "buffer"
// pwszValue : LPCWSTR -> "buffer"
// dwFlags : DWORD -> "u32"
// pdwType : DWORD* optional, out -> "pointer"
// pvData : void* optional, out -> "pointer"
// cbDataIn : DWORD -> "u32"
// pcbDataOut : DWORD* optional, 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 GetRegistryValueWithFallbackW(
    void* hkeyPrimary,
    const uint16_t* pwszPrimarySubKey,
    void* hkeyFallback,
    const uint16_t* pwszFallbackSubKey,
    const uint16_t* pwszValue,
    uint32_t dwFlags,
    uint32_t* pdwType,
    void* pvData,
    uint32_t cbDataIn,
    uint32_t* pcbDataOut);
C, "api-ms-win-core-state-helpers-l1-1-0.dll");
// $ffi->GetRegistryValueWithFallbackW(hkeyPrimary, pwszPrimarySubKey, hkeyFallback, pwszFallbackSubKey, pwszValue, dwFlags, pdwType, pvData, cbDataIn, pcbDataOut);
// hkeyPrimary : HKEY optional
// pwszPrimarySubKey : LPCWSTR optional
// hkeyFallback : HKEY optional
// pwszFallbackSubKey : LPCWSTR optional
// pwszValue : LPCWSTR
// dwFlags : DWORD
// pdwType : DWORD* optional, out
// pvData : void* optional, out
// cbDataIn : DWORD
// pcbDataOut : DWORD* optional, 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 Api-ms-win-core-state-helpers-l1-1-0 extends StdCallLibrary {
    Api-ms-win-core-state-helpers-l1-1-0 INSTANCE = Native.load("api-ms-win-core-state-helpers-l1-1-0", Api-ms-win-core-state-helpers-l1-1-0.class);
    int GetRegistryValueWithFallbackW(
        Pointer hkeyPrimary,   // HKEY optional
        WString pwszPrimarySubKey,   // LPCWSTR optional
        Pointer hkeyFallback,   // HKEY optional
        WString pwszFallbackSubKey,   // LPCWSTR optional
        WString pwszValue,   // LPCWSTR
        int dwFlags,   // DWORD
        IntByReference pdwType,   // DWORD* optional, out
        Pointer pvData,   // void* optional, out
        int cbDataIn,   // DWORD
        IntByReference pcbDataOut   // DWORD* optional, out
    );
}

@[Link("api-ms-win-core-state-helpers-l1-1-0")]
lib Libapi-ms-win-core-state-helpers-l1-1-0
  fun GetRegistryValueWithFallbackW = GetRegistryValueWithFallbackW(
    hkeyPrimary : Void*,   # HKEY optional
    pwszPrimarySubKey : UInt16*,   # LPCWSTR optional
    hkeyFallback : Void*,   # HKEY optional
    pwszFallbackSubKey : UInt16*,   # LPCWSTR optional
    pwszValue : UInt16*,   # LPCWSTR
    dwFlags : UInt32,   # DWORD
    pdwType : UInt32*,   # DWORD* optional, out
    pvData : Void*,   # void* optional, out
    cbDataIn : UInt32,   # DWORD
    pcbDataOut : UInt32*   # DWORD* optional, 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 GetRegistryValueWithFallbackWNative = Uint32 Function(Pointer<Void>, Pointer<Utf16>, Pointer<Void>, Pointer<Utf16>, Pointer<Utf16>, Uint32, Pointer<Uint32>, Pointer<Void>, Uint32, Pointer<Uint32>);
typedef GetRegistryValueWithFallbackWDart = int Function(Pointer<Void>, Pointer<Utf16>, Pointer<Void>, Pointer<Utf16>, Pointer<Utf16>, int, Pointer<Uint32>, Pointer<Void>, int, Pointer<Uint32>);
final GetRegistryValueWithFallbackW = DynamicLibrary.open('api-ms-win-core-state-helpers-l1-1-0.dll')
    .lookupFunction<GetRegistryValueWithFallbackWNative, GetRegistryValueWithFallbackWDart>('GetRegistryValueWithFallbackW');
// hkeyPrimary : HKEY optional -> Pointer<Void>
// pwszPrimarySubKey : LPCWSTR optional -> Pointer<Utf16>
// hkeyFallback : HKEY optional -> Pointer<Void>
// pwszFallbackSubKey : LPCWSTR optional -> Pointer<Utf16>
// pwszValue : LPCWSTR -> Pointer<Utf16>
// dwFlags : DWORD -> Uint32
// pdwType : DWORD* optional, out -> Pointer<Uint32>
// pvData : void* optional, out -> Pointer<Void>
// cbDataIn : DWORD -> Uint32
// pcbDataOut : DWORD* optional, out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetRegistryValueWithFallbackW(
  hkeyPrimary: THandle;   // HKEY optional
  pwszPrimarySubKey: PWideChar;   // LPCWSTR optional
  hkeyFallback: THandle;   // HKEY optional
  pwszFallbackSubKey: PWideChar;   // LPCWSTR optional
  pwszValue: PWideChar;   // LPCWSTR
  dwFlags: DWORD;   // DWORD
  pdwType: Pointer;   // DWORD* optional, out
  pvData: Pointer;   // void* optional, out
  cbDataIn: DWORD;   // DWORD
  pcbDataOut: Pointer   // DWORD* optional, out
): DWORD; stdcall;
  external 'api-ms-win-core-state-helpers-l1-1-0.dll' name 'GetRegistryValueWithFallbackW';

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

foreign import stdcall safe "GetRegistryValueWithFallbackW"
  c_GetRegistryValueWithFallbackW :: Ptr () -> CWString -> Ptr () -> CWString -> CWString -> Word32 -> Ptr Word32 -> Ptr () -> Word32 -> Ptr Word32 -> IO Word32
-- hkeyPrimary : HKEY optional -> Ptr ()
-- pwszPrimarySubKey : LPCWSTR optional -> CWString
-- hkeyFallback : HKEY optional -> Ptr ()
-- pwszFallbackSubKey : LPCWSTR optional -> CWString
-- pwszValue : LPCWSTR -> CWString
-- dwFlags : DWORD -> Word32
-- pdwType : DWORD* optional, out -> Ptr Word32
-- pvData : void* optional, out -> Ptr ()
-- cbDataIn : DWORD -> Word32
-- pcbDataOut : DWORD* optional, 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 getregistryvaluewithfallbackw =
  foreign "GetRegistryValueWithFallbackW"
    ((ptr void) @-> (ptr uint16_t) @-> (ptr void) @-> (ptr uint16_t) @-> (ptr uint16_t) @-> uint32_t @-> (ptr uint32_t) @-> (ptr void) @-> uint32_t @-> (ptr uint32_t) @-> returning uint32_t)
(* hkeyPrimary : HKEY optional -> (ptr void) *)
(* pwszPrimarySubKey : LPCWSTR optional -> (ptr uint16_t) *)
(* hkeyFallback : HKEY optional -> (ptr void) *)
(* pwszFallbackSubKey : LPCWSTR optional -> (ptr uint16_t) *)
(* pwszValue : LPCWSTR -> (ptr uint16_t) *)
(* dwFlags : DWORD -> uint32_t *)
(* pdwType : DWORD* optional, out -> (ptr uint32_t) *)
(* pvData : void* optional, out -> (ptr void) *)
(* cbDataIn : DWORD -> uint32_t *)
(* pcbDataOut : DWORD* optional, 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 api-ms-win-core-state-helpers-l1-1-0 (t "api-ms-win-core-state-helpers-l1-1-0.dll"))
(cffi:use-foreign-library api-ms-win-core-state-helpers-l1-1-0)

(cffi:defcfun ("GetRegistryValueWithFallbackW" get-registry-value-with-fallback-w :convention :stdcall) :uint32
  (hkey-primary :pointer)   ; HKEY optional
  (pwsz-primary-sub-key (:string :encoding :utf-16le))   ; LPCWSTR optional
  (hkey-fallback :pointer)   ; HKEY optional
  (pwsz-fallback-sub-key (:string :encoding :utf-16le))   ; LPCWSTR optional
  (pwsz-value (:string :encoding :utf-16le))   ; LPCWSTR
  (dw-flags :uint32)   ; DWORD
  (pdw-type :pointer)   ; DWORD* optional, out
  (pv-data :pointer)   ; void* optional, out
  (cb-data-in :uint32)   ; DWORD
  (pcb-data-out :pointer))   ; DWORD* optional, out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetRegistryValueWithFallbackW = Win32::API::More->new('api-ms-win-core-state-helpers-l1-1-0',
    'DWORD GetRegistryValueWithFallbackW(HANDLE hkeyPrimary, LPCWSTR pwszPrimarySubKey, HANDLE hkeyFallback, LPCWSTR pwszFallbackSubKey, LPCWSTR pwszValue, DWORD dwFlags, LPVOID pdwType, LPVOID pvData, DWORD cbDataIn, LPVOID pcbDataOut)');
# my $ret = $GetRegistryValueWithFallbackW->Call($hkeyPrimary, $pwszPrimarySubKey, $hkeyFallback, $pwszFallbackSubKey, $pwszValue, $dwFlags, $pdwType, $pvData, $cbDataIn, $pcbDataOut);
# hkeyPrimary : HKEY optional -> HANDLE
# pwszPrimarySubKey : LPCWSTR optional -> LPCWSTR
# hkeyFallback : HKEY optional -> HANDLE
# pwszFallbackSubKey : LPCWSTR optional -> LPCWSTR
# pwszValue : LPCWSTR -> LPCWSTR
# dwFlags : DWORD -> DWORD
# pdwType : DWORD* optional, out -> LPVOID
# pvData : void* optional, out -> LPVOID
# cbDataIn : DWORD -> DWORD
# pcbDataOut : DWORD* optional, out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。