SHGetValueA

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

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

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SHGetValueA(
    hkey As IntPtr,   ' HKEY
    <MarshalAs(UnmanagedType.LPStr)> pszSubKey As String,   ' LPCSTR optional
    <MarshalAs(UnmanagedType.LPStr)> pszValue As String,   ' LPCSTR 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 : LPCSTR optional
' pszValue : LPCSTR optional
' pdwType : DWORD* optional, out
' pvData : void* optional, out
' pcbData : DWORD* optional, in/out
Declare PtrSafe Function SHGetValueA Lib "shlwapi" ( _
    ByVal hkey As LongPtr, _
    ByVal pszSubKey As String, _
    ByVal pszValue As String, _
    ByVal pdwType As LongPtr, _
    ByVal pvData As LongPtr, _
    ByVal pcbData 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

SHGetValueA = ctypes.windll.shlwapi.SHGetValueA
SHGetValueA.restype = wintypes.DWORD
SHGetValueA.argtypes = [
    wintypes.HANDLE,  # hkey : HKEY
    wintypes.LPCSTR,  # pszSubKey : LPCSTR optional
    wintypes.LPCSTR,  # pszValue : LPCSTR 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')
SHGetValueA = Fiddle::Function.new(
  lib['SHGetValueA'],
  [
    Fiddle::TYPE_VOIDP,  # hkey : HKEY
    Fiddle::TYPE_VOIDP,  # pszSubKey : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # pszValue : LPCSTR 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)

#[link(name = "shlwapi")]
extern "system" {
    fn SHGetValueA(
        hkey: *mut core::ffi::c_void,  // HKEY
        pszSubKey: *const u8,  // LPCSTR optional
        pszValue: *const u8,  // LPCSTR 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.Ansi)]
public static extern uint SHGetValueA(IntPtr hkey, [MarshalAs(UnmanagedType.LPStr)] string pszSubKey, [MarshalAs(UnmanagedType.LPStr)] string pszValue, IntPtr pdwType, IntPtr pvData, IntPtr pcbData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHGetValueA' -Namespace Win32 -PassThru
# $api::SHGetValueA(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData)

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

#uselib "SHLWAPI.dll"
#cfunc global SHGetValueA "SHGetValueA" sptr, str, str, var, sptr, var
; res = SHGetValueA(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData)
; hkey : HKEY -> "sptr"
; pszSubKey : LPCSTR optional -> "str"
; pszValue : LPCSTR optional -> "str"
; 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 SHGetValueA(HKEY hkey, LPCSTR pszSubKey, LPCSTR pszValue, DWORD* pdwType, void* pvData, DWORD* pcbData)
#uselib "SHLWAPI.dll"
#cfunc global SHGetValueA "SHGetValueA" intptr, str, str, var, intptr, var
; res = SHGetValueA(hkey, pszSubKey, pszValue, pdwType, pvData, pcbData)
; hkey : HKEY -> "intptr"
; pszSubKey : LPCSTR optional -> "str"
; pszValue : LPCSTR optional -> "str"
; 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")
	procSHGetValueA = shlwapi.NewProc("SHGetValueA")
)

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

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

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

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