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)。

const std = @import("std");

extern "user32" fn LoadKeyboardLayoutA(
    pwszKLID: [*c]const u8, // LPCSTR
    Flags: u32 // ACTIVATE_KEYBOARD_LAYOUT_FLAGS
) callconv(std.os.windows.WINAPI) ?*anyopaque;

proc LoadKeyboardLayoutA(
    pwszKLID: cstring,  # LPCSTR
    Flags: uint32  # ACTIVATE_KEYBOARD_LAYOUT_FLAGS
): pointer {.importc: "LoadKeyboardLayoutA", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
void* LoadKeyboardLayoutA(
    const(char)* pwszKLID,   // LPCSTR
    uint Flags   // ACTIVATE_KEYBOARD_LAYOUT_FLAGS
);

ccall((:LoadKeyboardLayoutA, "USER32.dll"), stdcall, Ptr{Cvoid},
      (Cstring, UInt32),
      pwszKLID, Flags)
# pwszKLID : LPCSTR -> Cstring
# Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void* LoadKeyboardLayoutA(
    const char* pwszKLID,
    uint32_t Flags);
]]
local user32 = ffi.load("user32")
-- user32.LoadKeyboardLayoutA(pwszKLID, Flags)
-- pwszKLID : LPCSTR
-- Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('USER32.dll');
const LoadKeyboardLayoutA = lib.func('__stdcall', 'LoadKeyboardLayoutA', 'void *', ['str', 'uint32_t']);
// LoadKeyboardLayoutA(pwszKLID, Flags)
// pwszKLID : LPCSTR -> 'str'
// Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> 'uint32_t'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("USER32.dll", {
  LoadKeyboardLayoutA: { parameters: ["buffer", "u32"], result: "pointer" },
});
// lib.symbols.LoadKeyboardLayoutA(pwszKLID, Flags)
// pwszKLID : LPCSTR -> "buffer"
// Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> "u32"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
void* LoadKeyboardLayoutA(
    const char* pwszKLID,
    uint32_t Flags);
C, "USER32.dll");
// $ffi->LoadKeyboardLayoutA(pwszKLID, Flags);
// pwszKLID : LPCSTR
// Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface User32 extends StdCallLibrary {
    User32 INSTANCE = Native.load("user32", User32.class, W32APIOptions.ASCII_OPTIONS);
    Pointer LoadKeyboardLayoutA(
        String pwszKLID,   // LPCSTR
        int Flags   // ACTIVATE_KEYBOARD_LAYOUT_FLAGS
    );
}

@[Link("user32")]
lib LibUSER32
  fun LoadKeyboardLayoutA = LoadKeyboardLayoutA(
    pwszKLID : UInt8*,   # LPCSTR
    Flags : UInt32   # ACTIVATE_KEYBOARD_LAYOUT_FLAGS
  ) : Void*
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef LoadKeyboardLayoutANative = Pointer<Void> Function(Pointer<Utf8>, Uint32);
typedef LoadKeyboardLayoutADart = Pointer<Void> Function(Pointer<Utf8>, int);
final LoadKeyboardLayoutA = DynamicLibrary.open('USER32.dll')
    .lookupFunction<LoadKeyboardLayoutANative, LoadKeyboardLayoutADart>('LoadKeyboardLayoutA');
// pwszKLID : LPCSTR -> Pointer<Utf8>
// Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function LoadKeyboardLayoutA(
  pwszKLID: PAnsiChar;   // LPCSTR
  Flags: DWORD   // ACTIVATE_KEYBOARD_LAYOUT_FLAGS
): THandle; stdcall;
  external 'USER32.dll' name 'LoadKeyboardLayoutA';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "LoadKeyboardLayoutA"
  c_LoadKeyboardLayoutA :: CString -> Word32 -> IO (Ptr ())
-- pwszKLID : LPCSTR -> CString
-- Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let loadkeyboardlayouta =
  foreign "LoadKeyboardLayoutA"
    (string @-> uint32_t @-> returning (ptr void))
(* pwszKLID : LPCSTR -> string *)
(* Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> uint32_t *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library user32 (t "USER32.dll"))
(cffi:use-foreign-library user32)

(cffi:defcfun ("LoadKeyboardLayoutA" load-keyboard-layout-a :convention :stdcall) :pointer
  (pwsz-klid :string)   ; LPCSTR
  (flags :uint32))   ; ACTIVATE_KEYBOARD_LAYOUT_FLAGS
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $LoadKeyboardLayoutA = Win32::API::More->new('USER32',
    'HANDLE LoadKeyboardLayoutA(LPCSTR pwszKLID, DWORD Flags)');
# my $ret = $LoadKeyboardLayoutA->Call($pwszKLID, $Flags);
# pwszKLID : LPCSTR -> LPCSTR
# Flags : ACTIVATE_KEYBOARD_LAYOUT_FLAGS -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。