LoadKeyboardLayoutW

// USER32.dll  (Unicode / -W)
#include <windows.h>

HKL LoadKeyboardLayoutW(
    LPCWSTR pwszKLID,
    ACTIVATE_KEYBOARD_LAYOUT_FLAGS Flags
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function LoadKeyboardLayoutW(
    <MarshalAs(UnmanagedType.LPWStr)> pwszKLID As String,   ' LPCWSTR
    Flags As UInteger   ' ACTIVATE_KEYBOARD_LAYOUT_FLAGS
) As IntPtr
End Function

' pwszKLID : LPCWSTR
' Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS
Declare PtrSafe Function LoadKeyboardLayoutW Lib "user32" ( _
    ByVal pwszKLID As LongPtr, _
    ByVal Flags As Long) As LongPtr
' 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

LoadKeyboardLayoutW = ctypes.windll.user32.LoadKeyboardLayoutW
LoadKeyboardLayoutW.restype = ctypes.c_void_p
LoadKeyboardLayoutW.argtypes = [
    wintypes.LPCWSTR,  # pwszKLID : LPCWSTR
    wintypes.DWORD,  # Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
LoadKeyboardLayoutW = Fiddle::Function.new(
  lib['LoadKeyboardLayoutW'],
  [
    Fiddle::TYPE_VOIDP,  # pwszKLID : LPCWSTR
    -Fiddle::TYPE_INT,  # Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn LoadKeyboardLayoutW(
        pwszKLID: *const u16,  // LPCWSTR
        Flags: u32  // ACTIVATE_KEYBOARD_LAYOUT_FLAGS
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr LoadKeyboardLayoutW([MarshalAs(UnmanagedType.LPWStr)] string pwszKLID, uint Flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_LoadKeyboardLayoutW' -Namespace Win32 -PassThru
# $api::LoadKeyboardLayoutW(pwszKLID, Flags)

#uselib "USER32.dll"
#func global LoadKeyboardLayoutW "LoadKeyboardLayoutW" wptr, wptr
; LoadKeyboardLayoutW pwszKLID, Flags   ; 戻り値は stat
; pwszKLID : LPCWSTR -> "wptr"
; Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "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 "USER32.dll"
#cfunc global LoadKeyboardLayoutW "LoadKeyboardLayoutW" wstr, int
; res = LoadKeyboardLayoutW(pwszKLID, Flags)
; pwszKLID : LPCWSTR -> "wstr"
; Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "int"

; HKL LoadKeyboardLayoutW(LPCWSTR pwszKLID, ACTIVATE_KEYBOARD_LAYOUT_FLAGS Flags)
#uselib "USER32.dll"
#cfunc global LoadKeyboardLayoutW "LoadKeyboardLayoutW" wstr, int
; res = LoadKeyboardLayoutW(pwszKLID, Flags)
; pwszKLID : LPCWSTR -> "wstr"
; Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procLoadKeyboardLayoutW = user32.NewProc("LoadKeyboardLayoutW")
)

// pwszKLID (LPCWSTR), Flags (ACTIVATE_KEYBOARD_LAYOUT_FLAGS)
r1, _, err := procLoadKeyboardLayoutW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwszKLID))),
	uintptr(Flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HKL

function LoadKeyboardLayoutW(
  pwszKLID: PWideChar;   // LPCWSTR
  Flags: DWORD   // ACTIVATE_KEYBOARD_LAYOUT_FLAGS
): THandle; stdcall;
  external 'USER32.dll' name 'LoadKeyboardLayoutW';

result := DllCall("USER32\LoadKeyboardLayoutW"
    , "WStr", pwszKLID   ; LPCWSTR
    , "UInt", Flags   ; ACTIVATE_KEYBOARD_LAYOUT_FLAGS
    , "Ptr")   ; return: HKL

●LoadKeyboardLayoutW(pwszKLID, Flags) = DLL("USER32.dll", "void* LoadKeyboardLayoutW(char*, dword)")
# 呼び出し: LoadKeyboardLayoutW(pwszKLID, Flags)
# pwszKLID : LPCWSTR -> "char*"
# Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "dword"
# 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。