SetThreadUILanguage

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

WORD SetThreadUILanguage(
    WORD LangId
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetThreadUILanguage(
    LangId As UShort   ' WORD
) As UShort
End Function

' LangId : WORD
Declare PtrSafe Function SetThreadUILanguage Lib "kernel32" ( _
    ByVal LangId As Integer) As Integer
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetThreadUILanguage = ctypes.windll.kernel32.SetThreadUILanguage
SetThreadUILanguage.restype = ctypes.c_ushort
SetThreadUILanguage.argtypes = [
    ctypes.c_ushort,  # LangId : WORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
SetThreadUILanguage = Fiddle::Function.new(
  lib['SetThreadUILanguage'],
  [
    -Fiddle::TYPE_SHORT,  # LangId : WORD
  ],
  -Fiddle::TYPE_SHORT)

#[link(name = "kernel32")]
extern "system" {
    fn SetThreadUILanguage(
        LangId: u16  // WORD
    ) -> u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern ushort SetThreadUILanguage(ushort LangId);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_SetThreadUILanguage' -Namespace Win32 -PassThru
# $api::SetThreadUILanguage(LangId)

#uselib "KERNEL32.dll"
#func global SetThreadUILanguage "SetThreadUILanguage" sptr
; SetThreadUILanguage LangId   ; 戻り値は stat
; LangId : WORD -> "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 SetThreadUILanguage "SetThreadUILanguage" int
; res = SetThreadUILanguage(LangId)
; LangId : WORD -> "int"

; WORD SetThreadUILanguage(WORD LangId)
#uselib "KERNEL32.dll"
#cfunc global SetThreadUILanguage "SetThreadUILanguage" int
; res = SetThreadUILanguage(LangId)
; LangId : WORD -> "int"

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procSetThreadUILanguage = kernel32.NewProc("SetThreadUILanguage")
)

// LangId (WORD)
r1, _, err := procSetThreadUILanguage.Call(
	uintptr(LangId),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WORD

function SetThreadUILanguage(
  LangId: Word   // WORD
): Word; stdcall;
  external 'KERNEL32.dll' name 'SetThreadUILanguage';

result := DllCall("KERNEL32\SetThreadUILanguage"
    , "UShort", LangId   ; WORD
    , "UShort")   ; return: WORD

●SetThreadUILanguage(LangId) = DLL("KERNEL32.dll", "int SetThreadUILanguage(int)")
# 呼び出し: SetThreadUILanguage(LangId)
# LangId : WORD -> "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)。