LoadKeyboardLayoutA

// USER32.dll  (ANSI / -A)
#include <windows.h>

HKL LoadKeyboardLayoutA(
    LPCSTR pwszKLID,
    ACTIVATE_KEYBOARD_LAYOUT_FLAGS Flags
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function LoadKeyboardLayoutA(
    <MarshalAs(UnmanagedType.LPStr)> pwszKLID As String,   ' LPCSTR
    Flags As UInteger   ' ACTIVATE_KEYBOARD_LAYOUT_FLAGS
) As IntPtr
End Function

' pwszKLID : LPCSTR
' Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS
Declare PtrSafe Function LoadKeyboardLayoutA Lib "user32" ( _
    ByVal pwszKLID As String, _
    ByVal Flags As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

LoadKeyboardLayoutA = ctypes.windll.user32.LoadKeyboardLayoutA
LoadKeyboardLayoutA.restype = ctypes.c_void_p
LoadKeyboardLayoutA.argtypes = [
    wintypes.LPCSTR,  # pwszKLID : LPCSTR
    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')
LoadKeyboardLayoutA = Fiddle::Function.new(
  lib['LoadKeyboardLayoutA'],
  [
    Fiddle::TYPE_VOIDP,  # pwszKLID : LPCSTR
    -Fiddle::TYPE_INT,  # Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn LoadKeyboardLayoutA(
        pwszKLID: *const u8,  // LPCSTR
        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.Ansi, SetLastError = true)]
public static extern IntPtr LoadKeyboardLayoutA([MarshalAs(UnmanagedType.LPStr)] string pwszKLID, uint Flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_LoadKeyboardLayoutA' -Namespace Win32 -PassThru
# $api::LoadKeyboardLayoutA(pwszKLID, Flags)

#uselib "USER32.dll"
#func global LoadKeyboardLayoutA "LoadKeyboardLayoutA" sptr, sptr
; LoadKeyboardLayoutA pwszKLID, Flags   ; 戻り値は stat
; pwszKLID : LPCSTR -> "sptr"
; Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "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 "USER32.dll"
#cfunc global LoadKeyboardLayoutA "LoadKeyboardLayoutA" str, int
; res = LoadKeyboardLayoutA(pwszKLID, Flags)
; pwszKLID : LPCSTR -> "str"
; Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "int"

; HKL LoadKeyboardLayoutA(LPCSTR pwszKLID, ACTIVATE_KEYBOARD_LAYOUT_FLAGS Flags)
#uselib "USER32.dll"
#cfunc global LoadKeyboardLayoutA "LoadKeyboardLayoutA" str, int
; res = LoadKeyboardLayoutA(pwszKLID, Flags)
; pwszKLID : LPCSTR -> "str"
; Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procLoadKeyboardLayoutA = user32.NewProc("LoadKeyboardLayoutA")
)

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

function LoadKeyboardLayoutA(
  pwszKLID: PAnsiChar;   // LPCSTR
  Flags: DWORD   // ACTIVATE_KEYBOARD_LAYOUT_FLAGS
): THandle; stdcall;
  external 'USER32.dll' name 'LoadKeyboardLayoutA';

result := DllCall("USER32\LoadKeyboardLayoutA"
    , "AStr", pwszKLID   ; LPCSTR
    , "UInt", Flags   ; ACTIVATE_KEYBOARD_LAYOUT_FLAGS
    , "Ptr")   ; return: HKL

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