SHGetValueW

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

WIN32_ERROR SHGetValueW(
    HKEY hkey,
    LPCWSTR pszSubKey,   // optional
    LPCWSTR pszValue,   // optional
    DWORD* pdwType,   // optional
    void* pvData,   // optional
    DWORD* pcbData   // optional
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SHGetValueW(
    hkey As IntPtr,   ' HKEY
    <MarshalAs(UnmanagedType.LPWStr)> pszSubKey As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pszValue As String,   ' LPCWSTR optional
    pdwType As IntPtr,   ' DWORD* optional, out
    pvData As IntPtr,   ' void* optional, out
    pcbData As IntPtr   ' DWORD* optional, in/out
) As UInteger
End Function

' hkey : HKEY
' pszSubKey : LPCWSTR optional
' pszValue : LPCWSTR optional
' pdwType : DWORD* optional, out
' pvData : void* optional, out
' pcbData : DWORD* optional, in/out
Declare PtrSafe Function SHGetValueW Lib "shlwapi" ( _
    ByVal hkey As LongPtr, _
    ByVal pszSubKey As LongPtr, _
    ByVal pszValue As LongPtr, _
    ByVal pdwType As LongPtr, _
    ByVal pvData As LongPtr, _
    ByVal pcbData As LongPtr) 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

SHGetValueW = ctypes.windll.shlwapi.SHGetValueW
SHGetValueW.restype = wintypes.DWORD
SHGetValueW.argtypes = [
    wintypes.HANDLE,  # hkey : HKEY
    wintypes.LPCWSTR,  # pszSubKey : LPCWSTR optional
    wintypes.LPCWSTR,  # pszValue : LPCWSTR optional
    ctypes.POINTER(wintypes.DWORD),  # pdwType : DWORD* optional, out
    ctypes.POINTER(None),  # pvData : void* optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcbData : DWORD* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHGetValueW = Fiddle::Function.new(
  lib['SHGetValueW'],
  [
    Fiddle::TYPE_VOIDP,  # hkey : HKEY
    Fiddle::TYPE_VOIDP,  # pszSubKey : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pszValue : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pdwType : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # pvData : void* optional, out
    Fiddle::TYPE_VOIDP,  # pcbData : DWORD* optional, in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shlwapi")]
extern "system" {
    fn SHGetValueW(
        hkey: *mut core::ffi::c_void,  // HKEY
        pszSubKey: *const u16,  // LPCWSTR optional
        pszValue: *const u16,  // LPCWSTR optional
        pdwType: *mut u32,  // DWORD* optional, out
        pvData: *mut (),  // void* optional, out
        pcbData: *mut u32  // DWORD* optional, in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll", CharSet = CharSet.Unicode)]
public static extern uint SHGetValueW(IntPtr hkey, [MarshalAs(UnmanagedType.LPWStr)] string pszSubKey, [MarshalAs(UnmanagedType.LPWStr)] string pszValue, IntPtr pdwType, IntPtr pvData, IntPtr pcbData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHGetValueW' -Namespace Win32 -PassThru
# $api::SHGetValueW(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData)

#uselib "SHLWAPI.dll"
#func global SHGetValueW "SHGetValueW" wptr, wptr, wptr, wptr, wptr, wptr
; SHGetValueW hkey, pszSubKey, pszValue, varptr(pdwType), pvData, varptr(pcbData)   ; 戻り値は stat
; hkey : HKEY -> "wptr"
; pszSubKey : LPCWSTR optional -> "wptr"
; pszValue : LPCWSTR optional -> "wptr"
; pdwType : DWORD* optional, out -> "wptr"
; pvData : void* optional, out -> "wptr"
; pcbData : DWORD* optional, 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。

#uselib "SHLWAPI.dll"
#cfunc global SHGetValueW "SHGetValueW" sptr, wstr, wstr, var, sptr, var
; res = SHGetValueW(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData)
; hkey : HKEY -> "sptr"
; pszSubKey : LPCWSTR optional -> "wstr"
; pszValue : LPCWSTR optional -> "wstr"
; pdwType : DWORD* optional, out -> "var"
; pvData : void* optional, out -> "sptr"
; pcbData : DWORD* optional, in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; WIN32_ERROR SHGetValueW(HKEY hkey, LPCWSTR pszSubKey, LPCWSTR pszValue, DWORD* pdwType, void* pvData, DWORD* pcbData)
#uselib "SHLWAPI.dll"
#cfunc global SHGetValueW "SHGetValueW" intptr, wstr, wstr, var, intptr, var
; res = SHGetValueW(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData)
; hkey : HKEY -> "intptr"
; pszSubKey : LPCWSTR optional -> "wstr"
; pszValue : LPCWSTR optional -> "wstr"
; pdwType : DWORD* optional, out -> "var"
; pvData : void* optional, out -> "intptr"
; pcbData : DWORD* optional, in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHGetValueW = shlwapi.NewProc("SHGetValueW")
)

// hkey (HKEY), pszSubKey (LPCWSTR optional), pszValue (LPCWSTR optional), pdwType (DWORD* optional, out), pvData (void* optional, out), pcbData (DWORD* optional, in/out)
r1, _, err := procSHGetValueW.Call(
	uintptr(hkey),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszSubKey))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszValue))),
	uintptr(pdwType),
	uintptr(pvData),
	uintptr(pcbData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function SHGetValueW(
  hkey: THandle;   // HKEY
  pszSubKey: PWideChar;   // LPCWSTR optional
  pszValue: PWideChar;   // LPCWSTR optional
  pdwType: Pointer;   // DWORD* optional, out
  pvData: Pointer;   // void* optional, out
  pcbData: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'SHLWAPI.dll' name 'SHGetValueW';

result := DllCall("SHLWAPI\SHGetValueW"
    , "Ptr", hkey   ; HKEY
    , "WStr", pszSubKey   ; LPCWSTR optional
    , "WStr", pszValue   ; LPCWSTR optional
    , "Ptr", pdwType   ; DWORD* optional, out
    , "Ptr", pvData   ; void* optional, out
    , "Ptr", pcbData   ; DWORD* optional, in/out
    , "UInt")   ; return: WIN32_ERROR

●SHGetValueW(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData) = DLL("SHLWAPI.dll", "dword SHGetValueW(void*, char*, char*, void*, void*, void*)")
# 呼び出し: SHGetValueW(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData)
# hkey : HKEY -> "void*"
# pszSubKey : LPCWSTR optional -> "char*"
# pszValue : LPCWSTR optional -> "char*"
# pdwType : DWORD* optional, out -> "void*"
# pvData : void* optional, out -> "void*"
# pcbData : DWORD* optional, 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。