SetLocaleInfoW

// KERNEL32.dll  (Unicode / -W)
#include <windows.h>

BOOL SetLocaleInfoW(
    DWORD Locale,
    DWORD LCType,
    LPCWSTR lpLCData
);

<DllImport("KERNEL32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetLocaleInfoW(
    Locale As UInteger,   ' DWORD
    LCType As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpLCData As String   ' LPCWSTR
) As Boolean
End Function

' Locale : DWORD
' LCType : DWORD
' lpLCData : LPCWSTR
Declare PtrSafe Function SetLocaleInfoW Lib "kernel32" ( _
    ByVal Locale As Long, _
    ByVal LCType As Long, _
    ByVal lpLCData 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

SetLocaleInfoW = ctypes.windll.kernel32.SetLocaleInfoW
SetLocaleInfoW.restype = wintypes.BOOL
SetLocaleInfoW.argtypes = [
    wintypes.DWORD,  # Locale : DWORD
    wintypes.DWORD,  # LCType : DWORD
    wintypes.LPCWSTR,  # lpLCData : LPCWSTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetLocaleInfoW = Fiddle::Function.new(
  lib['SetLocaleInfoW'],
  [
    -Fiddle::TYPE_INT,  # Locale : DWORD
    -Fiddle::TYPE_INT,  # LCType : DWORD
    Fiddle::TYPE_VOIDP,  # lpLCData : LPCWSTR
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "kernel32")]
extern "system" {
    fn SetLocaleInfoW(
        Locale: u32,  // DWORD
        LCType: u32,  // DWORD
        lpLCData: *const u16  // LPCWSTR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("KERNEL32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool SetLocaleInfoW(uint Locale, uint LCType, [MarshalAs(UnmanagedType.LPWStr)] string lpLCData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetLocaleInfoW' -Namespace Win32 -PassThru
# $api::SetLocaleInfoW(Locale, LCType, lpLCData)

#uselib "KERNEL32.dll"
#func global SetLocaleInfoW "SetLocaleInfoW" wptr, wptr, wptr
; SetLocaleInfoW Locale, LCType, lpLCData   ; 戻り値は stat
; Locale : DWORD -> "wptr"
; LCType : DWORD -> "wptr"
; lpLCData : LPCWSTR -> "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 "KERNEL32.dll"
#cfunc global SetLocaleInfoW "SetLocaleInfoW" int, int, wstr
; res = SetLocaleInfoW(Locale, LCType, lpLCData)
; Locale : DWORD -> "int"
; LCType : DWORD -> "int"
; lpLCData : LPCWSTR -> "wstr"

; BOOL SetLocaleInfoW(DWORD Locale, DWORD LCType, LPCWSTR lpLCData)
#uselib "KERNEL32.dll"
#cfunc global SetLocaleInfoW "SetLocaleInfoW" int, int, wstr
; res = SetLocaleInfoW(Locale, LCType, lpLCData)
; Locale : DWORD -> "int"
; LCType : DWORD -> "int"
; lpLCData : LPCWSTR -> "wstr"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procSetLocaleInfoW = kernel32.NewProc("SetLocaleInfoW")
)

// Locale (DWORD), LCType (DWORD), lpLCData (LPCWSTR)
r1, _, err := procSetLocaleInfoW.Call(
	uintptr(Locale),
	uintptr(LCType),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpLCData))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetLocaleInfoW(
  Locale: DWORD;   // DWORD
  LCType: DWORD;   // DWORD
  lpLCData: PWideChar   // LPCWSTR
): BOOL; stdcall;
  external 'KERNEL32.dll' name 'SetLocaleInfoW';

result := DllCall("KERNEL32\SetLocaleInfoW"
    , "UInt", Locale   ; DWORD
    , "UInt", LCType   ; DWORD
    , "WStr", lpLCData   ; LPCWSTR
    , "Int")   ; return: BOOL

●SetLocaleInfoW(Locale, LCType, lpLCData) = DLL("KERNEL32.dll", "bool SetLocaleInfoW(dword, dword, char*)")
# 呼び出し: SetLocaleInfoW(Locale, LCType, lpLCData)
# Locale : DWORD -> "dword"
# LCType : DWORD -> "dword"
# lpLCData : LPCWSTR -> "char*"
# 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。