NotifyUILanguageChange

// KERNEL32.dll
#include <windows.h>

BOOL NotifyUILanguageChange(
    DWORD dwFlags,
    LPCWSTR pcwstrNewLanguage,   // optional
    LPCWSTR pcwstrPreviousLanguage,   // optional
    DWORD dwReserved,
    DWORD* pdwStatusRtrn   // optional
);

<DllImport("KERNEL32.dll", ExactSpelling:=True)>
Public Shared Function NotifyUILanguageChange(
    dwFlags As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pcwstrNewLanguage As String,   ' LPCWSTR optional
    <MarshalAs(UnmanagedType.LPWStr)> pcwstrPreviousLanguage As String,   ' LPCWSTR optional
    dwReserved As UInteger,   ' DWORD
    pdwStatusRtrn As IntPtr   ' DWORD* optional, out
) As Boolean
End Function

' dwFlags : DWORD
' pcwstrNewLanguage : LPCWSTR optional
' pcwstrPreviousLanguage : LPCWSTR optional
' dwReserved : DWORD
' pdwStatusRtrn : DWORD* optional, out
Declare PtrSafe Function NotifyUILanguageChange Lib "kernel32" ( _
    ByVal dwFlags As Long, _
    ByVal pcwstrNewLanguage As LongPtr, _
    ByVal pcwstrPreviousLanguage As LongPtr, _
    ByVal dwReserved As Long, _
    ByVal pdwStatusRtrn 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

NotifyUILanguageChange = ctypes.windll.kernel32.NotifyUILanguageChange
NotifyUILanguageChange.restype = wintypes.BOOL
NotifyUILanguageChange.argtypes = [
    wintypes.DWORD,  # dwFlags : DWORD
    wintypes.LPCWSTR,  # pcwstrNewLanguage : LPCWSTR optional
    wintypes.LPCWSTR,  # pcwstrPreviousLanguage : LPCWSTR optional
    wintypes.DWORD,  # dwReserved : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pdwStatusRtrn : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
NotifyUILanguageChange = Fiddle::Function.new(
  lib['NotifyUILanguageChange'],
  [
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pcwstrNewLanguage : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pcwstrPreviousLanguage : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwReserved : DWORD
    Fiddle::TYPE_VOIDP,  # pdwStatusRtrn : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn NotifyUILanguageChange(
        dwFlags: u32,  // DWORD
        pcwstrNewLanguage: *const u16,  // LPCWSTR optional
        pcwstrPreviousLanguage: *const u16,  // LPCWSTR optional
        dwReserved: u32,  // DWORD
        pdwStatusRtrn: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll")]
public static extern bool NotifyUILanguageChange(uint dwFlags, [MarshalAs(UnmanagedType.LPWStr)] string pcwstrNewLanguage, [MarshalAs(UnmanagedType.LPWStr)] string pcwstrPreviousLanguage, uint dwReserved, IntPtr pdwStatusRtrn);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_NotifyUILanguageChange' -Namespace Win32 -PassThru
# $api::NotifyUILanguageChange(dwFlags, pcwstrNewLanguage, pcwstrPreviousLanguage, dwReserved, pdwStatusRtrn)

#uselib "KERNEL32.dll"
#func global NotifyUILanguageChange "NotifyUILanguageChange" sptr, sptr, sptr, sptr, sptr
; NotifyUILanguageChange dwFlags, pcwstrNewLanguage, pcwstrPreviousLanguage, dwReserved, varptr(pdwStatusRtrn)   ; 戻り値は stat
; dwFlags : DWORD -> "sptr"
; pcwstrNewLanguage : LPCWSTR optional -> "sptr"
; pcwstrPreviousLanguage : LPCWSTR optional -> "sptr"
; dwReserved : DWORD -> "sptr"
; pdwStatusRtrn : 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。

#uselib "KERNEL32.dll"
#cfunc global NotifyUILanguageChange "NotifyUILanguageChange" int, wstr, wstr, int, var
; res = NotifyUILanguageChange(dwFlags, pcwstrNewLanguage, pcwstrPreviousLanguage, dwReserved, pdwStatusRtrn)
; dwFlags : DWORD -> "int"
; pcwstrNewLanguage : LPCWSTR optional -> "wstr"
; pcwstrPreviousLanguage : LPCWSTR optional -> "wstr"
; dwReserved : DWORD -> "int"
; pdwStatusRtrn : DWORD* optional, 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。

; BOOL NotifyUILanguageChange(DWORD dwFlags, LPCWSTR pcwstrNewLanguage, LPCWSTR pcwstrPreviousLanguage, DWORD dwReserved, DWORD* pdwStatusRtrn)
#uselib "KERNEL32.dll"
#cfunc global NotifyUILanguageChange "NotifyUILanguageChange" int, wstr, wstr, int, var
; res = NotifyUILanguageChange(dwFlags, pcwstrNewLanguage, pcwstrPreviousLanguage, dwReserved, pdwStatusRtrn)
; dwFlags : DWORD -> "int"
; pcwstrNewLanguage : LPCWSTR optional -> "wstr"
; pcwstrPreviousLanguage : LPCWSTR optional -> "wstr"
; dwReserved : DWORD -> "int"
; pdwStatusRtrn : DWORD* optional, 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 (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procNotifyUILanguageChange = kernel32.NewProc("NotifyUILanguageChange")
)

// dwFlags (DWORD), pcwstrNewLanguage (LPCWSTR optional), pcwstrPreviousLanguage (LPCWSTR optional), dwReserved (DWORD), pdwStatusRtrn (DWORD* optional, out)
r1, _, err := procNotifyUILanguageChange.Call(
	uintptr(dwFlags),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pcwstrNewLanguage))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pcwstrPreviousLanguage))),
	uintptr(dwReserved),
	uintptr(pdwStatusRtrn),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function NotifyUILanguageChange(
  dwFlags: DWORD;   // DWORD
  pcwstrNewLanguage: PWideChar;   // LPCWSTR optional
  pcwstrPreviousLanguage: PWideChar;   // LPCWSTR optional
  dwReserved: DWORD;   // DWORD
  pdwStatusRtrn: Pointer   // DWORD* optional, out
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'NotifyUILanguageChange';

result := DllCall("KERNEL32\NotifyUILanguageChange"
    , "UInt", dwFlags   ; DWORD
    , "WStr", pcwstrNewLanguage   ; LPCWSTR optional
    , "WStr", pcwstrPreviousLanguage   ; LPCWSTR optional
    , "UInt", dwReserved   ; DWORD
    , "Ptr", pdwStatusRtrn   ; DWORD* optional, out
    , "Int")   ; return: BOOL

●NotifyUILanguageChange(dwFlags, pcwstrNewLanguage, pcwstrPreviousLanguage, dwReserved, pdwStatusRtrn) = DLL("KERNEL32.dll", "bool NotifyUILanguageChange(dword, char*, char*, dword, void*)")
# 呼び出し: NotifyUILanguageChange(dwFlags, pcwstrNewLanguage, pcwstrPreviousLanguage, dwReserved, pdwStatusRtrn)
# dwFlags : DWORD -> "dword"
# pcwstrNewLanguage : LPCWSTR optional -> "char*"
# pcwstrPreviousLanguage : LPCWSTR optional -> "char*"
# dwReserved : DWORD -> "dword"
# pdwStatusRtrn : 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)。