SHEnumValueA

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

WIN32_ERROR SHEnumValueA(
    HKEY hkey,
    DWORD dwIndex,
    LPSTR pszValueName,   // optional
    DWORD* pcchValueName,   // optional
    DWORD* pdwType,   // optional
    void* pvData,   // optional
    DWORD* pcbData   // optional
);

<DllImport("SHLWAPI.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function SHEnumValueA(
    hkey As IntPtr,   ' HKEY
    dwIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> pszValueName As System.Text.StringBuilder,   ' LPSTR optional, out
    pcchValueName As IntPtr,   ' DWORD* optional, in/out
    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
' dwIndex : DWORD
' pszValueName : LPSTR optional, out
' pcchValueName : DWORD* optional, in/out
' pdwType : DWORD* optional, out
' pvData : void* optional, out
' pcbData : DWORD* optional, in/out
Declare PtrSafe Function SHEnumValueA Lib "shlwapi" ( _
    ByVal hkey As LongPtr, _
    ByVal dwIndex As Long, _
    ByVal pszValueName As String, _
    ByVal pcchValueName As LongPtr, _
    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

SHEnumValueA = ctypes.windll.shlwapi.SHEnumValueA
SHEnumValueA.restype = wintypes.DWORD
SHEnumValueA.argtypes = [
    wintypes.HANDLE,  # hkey : HKEY
    wintypes.DWORD,  # dwIndex : DWORD
    wintypes.LPSTR,  # pszValueName : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchValueName : DWORD* optional, in/out
    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')
SHEnumValueA = Fiddle::Function.new(
  lib['SHEnumValueA'],
  [
    Fiddle::TYPE_VOIDP,  # hkey : HKEY
    -Fiddle::TYPE_INT,  # dwIndex : DWORD
    Fiddle::TYPE_VOIDP,  # pszValueName : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchValueName : DWORD* optional, in/out
    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 SHEnumValueA(
        hkey: *mut core::ffi::c_void,  // HKEY
        dwIndex: u32,  // DWORD
        pszValueName: *mut u8,  // LPSTR optional, out
        pcchValueName: *mut u32,  // DWORD* optional, in/out
        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 SHEnumValueA(IntPtr hkey, uint dwIndex, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pszValueName, IntPtr pcchValueName, IntPtr pdwType, IntPtr pvData, IntPtr pcbData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHEnumValueA' -Namespace Win32 -PassThru
# $api::SHEnumValueA(hkey, dwIndex, pszValueName, pcchValueName, pdwType, pvData, pcbData)

#uselib "SHLWAPI.dll"
#func global SHEnumValueA "SHEnumValueA" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; SHEnumValueA hkey, dwIndex, varptr(pszValueName), varptr(pcchValueName), varptr(pdwType), pvData, varptr(pcbData)   ; 戻り値は stat
; hkey : HKEY -> "sptr"
; dwIndex : DWORD -> "sptr"
; pszValueName : LPSTR optional, out -> "sptr"
; pcchValueName : DWORD* optional, in/out -> "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 SHEnumValueA "SHEnumValueA" sptr, int, var, var, var, sptr, var
; res = SHEnumValueA(hkey, dwIndex, pszValueName, pcchValueName, pdwType, pvData, pcbData)
; hkey : HKEY -> "sptr"
; dwIndex : DWORD -> "int"
; pszValueName : LPSTR optional, out -> "var"
; pcchValueName : DWORD* optional, in/out -> "var"
; 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 SHEnumValueA(HKEY hkey, DWORD dwIndex, LPSTR pszValueName, DWORD* pcchValueName, DWORD* pdwType, void* pvData, DWORD* pcbData)
#uselib "SHLWAPI.dll"
#cfunc global SHEnumValueA "SHEnumValueA" intptr, int, var, var, var, intptr, var
; res = SHEnumValueA(hkey, dwIndex, pszValueName, pcchValueName, pdwType, pvData, pcbData)
; hkey : HKEY -> "intptr"
; dwIndex : DWORD -> "int"
; pszValueName : LPSTR optional, out -> "var"
; pcchValueName : DWORD* optional, in/out -> "var"
; 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")
	procSHEnumValueA = shlwapi.NewProc("SHEnumValueA")
)

// hkey (HKEY), dwIndex (DWORD), pszValueName (LPSTR optional, out), pcchValueName (DWORD* optional, in/out), pdwType (DWORD* optional, out), pvData (void* optional, out), pcbData (DWORD* optional, in/out)
r1, _, err := procSHEnumValueA.Call(
	uintptr(hkey),
	uintptr(dwIndex),
	uintptr(pszValueName),
	uintptr(pcchValueName),
	uintptr(pdwType),
	uintptr(pvData),
	uintptr(pcbData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WIN32_ERROR

function SHEnumValueA(
  hkey: THandle;   // HKEY
  dwIndex: DWORD;   // DWORD
  pszValueName: PAnsiChar;   // LPSTR optional, out
  pcchValueName: Pointer;   // DWORD* optional, in/out
  pdwType: Pointer;   // DWORD* optional, out
  pvData: Pointer;   // void* optional, out
  pcbData: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'SHLWAPI.dll' name 'SHEnumValueA';

result := DllCall("SHLWAPI\SHEnumValueA"
    , "Ptr", hkey   ; HKEY
    , "UInt", dwIndex   ; DWORD
    , "Ptr", pszValueName   ; LPSTR optional, out
    , "Ptr", pcchValueName   ; DWORD* optional, in/out
    , "Ptr", pdwType   ; DWORD* optional, out
    , "Ptr", pvData   ; void* optional, out
    , "Ptr", pcbData   ; DWORD* optional, in/out
    , "UInt")   ; return: WIN32_ERROR

●SHEnumValueA(hkey, dwIndex, pszValueName, pcchValueName, pdwType, pvData, pcbData) = DLL("SHLWAPI.dll", "dword SHEnumValueA(void*, dword, char*, void*, void*, void*, void*)")
# 呼び出し: SHEnumValueA(hkey, dwIndex, pszValueName, pcchValueName, pdwType, pvData, pcbData)
# hkey : HKEY -> "void*"
# dwIndex : DWORD -> "dword"
# pszValueName : LPSTR optional, out -> "char*"
# pcchValueName : DWORD* optional, in/out -> "void*"
# 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)。