SHRegGetIntW

// SHLWAPI.dll
#include <windows.h>

INT SHRegGetIntW(
    HKEY hk,
    LPCWSTR pwzKey,   // optional
    INT iDefault
);

<DllImport("SHLWAPI.dll", ExactSpelling:=True)>
Public Shared Function SHRegGetIntW(
    hk As IntPtr,   ' HKEY
    <MarshalAs(UnmanagedType.LPWStr)> pwzKey As String,   ' LPCWSTR optional
    iDefault As Integer   ' INT
) As Integer
End Function

' hk : HKEY
' pwzKey : LPCWSTR optional
' iDefault : INT
Declare PtrSafe Function SHRegGetIntW Lib "shlwapi" ( _
    ByVal hk As LongPtr, _
    ByVal pwzKey As LongPtr, _
    ByVal iDefault 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

SHRegGetIntW = ctypes.windll.shlwapi.SHRegGetIntW
SHRegGetIntW.restype = ctypes.c_int
SHRegGetIntW.argtypes = [
    wintypes.HANDLE,  # hk : HKEY
    wintypes.LPCWSTR,  # pwzKey : LPCWSTR optional
    ctypes.c_int,  # iDefault : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
SHRegGetIntW = Fiddle::Function.new(
  lib['SHRegGetIntW'],
  [
    Fiddle::TYPE_VOIDP,  # hk : HKEY
    Fiddle::TYPE_VOIDP,  # pwzKey : LPCWSTR optional
    Fiddle::TYPE_INT,  # iDefault : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "shlwapi")]
extern "system" {
    fn SHRegGetIntW(
        hk: *mut core::ffi::c_void,  // HKEY
        pwzKey: *const u16,  // LPCWSTR optional
        iDefault: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll")]
public static extern int SHRegGetIntW(IntPtr hk, [MarshalAs(UnmanagedType.LPWStr)] string pwzKey, int iDefault);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_SHRegGetIntW' -Namespace Win32 -PassThru
# $api::SHRegGetIntW(hk, pwzKey, iDefault)

#uselib "SHLWAPI.dll"
#func global SHRegGetIntW "SHRegGetIntW" sptr, sptr, sptr
; SHRegGetIntW hk, pwzKey, iDefault   ; 戻り値は stat
; hk : HKEY -> "sptr"
; pwzKey : LPCWSTR optional -> "sptr"
; iDefault : INT -> "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 SHRegGetIntW "SHRegGetIntW" sptr, wstr, int
; res = SHRegGetIntW(hk, pwzKey, iDefault)
; hk : HKEY -> "sptr"
; pwzKey : LPCWSTR optional -> "wstr"
; iDefault : INT -> "int"

; INT SHRegGetIntW(HKEY hk, LPCWSTR pwzKey, INT iDefault)
#uselib "SHLWAPI.dll"
#cfunc global SHRegGetIntW "SHRegGetIntW" intptr, wstr, int
; res = SHRegGetIntW(hk, pwzKey, iDefault)
; hk : HKEY -> "intptr"
; pwzKey : LPCWSTR optional -> "wstr"
; iDefault : INT -> "int"

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

var (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procSHRegGetIntW = shlwapi.NewProc("SHRegGetIntW")
)

// hk (HKEY), pwzKey (LPCWSTR optional), iDefault (INT)
r1, _, err := procSHRegGetIntW.Call(
	uintptr(hk),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwzKey))),
	uintptr(iDefault),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SHRegGetIntW(
  hk: THandle;   // HKEY
  pwzKey: PWideChar;   // LPCWSTR optional
  iDefault: Integer   // INT
): Integer; stdcall;
  external 'SHLWAPI.dll' name 'SHRegGetIntW';

result := DllCall("SHLWAPI\SHRegGetIntW"
    , "Ptr", hk   ; HKEY
    , "WStr", pwzKey   ; LPCWSTR optional
    , "Int", iDefault   ; INT
    , "Int")   ; return: INT

●SHRegGetIntW(hk, pwzKey, iDefault) = DLL("SHLWAPI.dll", "int SHRegGetIntW(void*, char*, int)")
# 呼び出し: SHRegGetIntW(hk, pwzKey, iDefault)
# hk : HKEY -> "void*"
# pwzKey : LPCWSTR optional -> "char*"
# iDefault : INT -> "int"
# 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)。