SetLayeredWindowAttributes

// USER32.dll
#include <windows.h>

BOOL SetLayeredWindowAttributes(
    HWND hwnd,
    COLORREF crKey,
    BYTE bAlpha,
    LAYERED_WINDOW_ATTRIBUTES_FLAGS dwFlags
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetLayeredWindowAttributes(
    hwnd As IntPtr,   ' HWND
    crKey As UInteger,   ' COLORREF
    bAlpha As Byte,   ' BYTE
    dwFlags As UInteger   ' LAYERED_WINDOW_ATTRIBUTES_FLAGS
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hwnd : HWND
' crKey : COLORREF
' bAlpha : BYTE
' dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS
Declare PtrSafe Function SetLayeredWindowAttributes Lib "user32" ( _
    ByVal hwnd As LongPtr, _
    ByVal crKey As Long, _
    ByVal bAlpha As Byte, _
    ByVal dwFlags As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetLayeredWindowAttributes = ctypes.windll.user32.SetLayeredWindowAttributes
SetLayeredWindowAttributes.restype = wintypes.BOOL
SetLayeredWindowAttributes.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
    wintypes.DWORD,  # crKey : COLORREF
    ctypes.c_ubyte,  # bAlpha : BYTE
    wintypes.DWORD,  # dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SetLayeredWindowAttributes = Fiddle::Function.new(
  lib['SetLayeredWindowAttributes'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
    -Fiddle::TYPE_INT,  # crKey : COLORREF
    -Fiddle::TYPE_CHAR,  # bAlpha : BYTE
    -Fiddle::TYPE_INT,  # dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn SetLayeredWindowAttributes(
        hwnd: *mut core::ffi::c_void,  // HWND
        crKey: u32,  // COLORREF
        bAlpha: u8,  // BYTE
        dwFlags: u32  // LAYERED_WINDOW_ATTRIBUTES_FLAGS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true)]
public static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SetLayeredWindowAttributes' -Namespace Win32 -PassThru
# $api::SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags)

#uselib "USER32.dll"
#func global SetLayeredWindowAttributes "SetLayeredWindowAttributes" sptr, sptr, sptr, sptr
; SetLayeredWindowAttributes hwnd, crKey, bAlpha, dwFlags   ; 戻り値は stat
; hwnd : HWND -> "sptr"
; crKey : COLORREF -> "sptr"
; bAlpha : BYTE -> "sptr"
; dwFlags : LAYERED_WINDOW_ATTRIBUTES_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 SetLayeredWindowAttributes "SetLayeredWindowAttributes" sptr, int, int, int
; res = SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags)
; hwnd : HWND -> "sptr"
; crKey : COLORREF -> "int"
; bAlpha : BYTE -> "int"
; dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS -> "int"

; BOOL SetLayeredWindowAttributes(HWND hwnd, COLORREF crKey, BYTE bAlpha, LAYERED_WINDOW_ATTRIBUTES_FLAGS dwFlags)
#uselib "USER32.dll"
#cfunc global SetLayeredWindowAttributes "SetLayeredWindowAttributes" intptr, int, int, int
; res = SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags)
; hwnd : HWND -> "intptr"
; crKey : COLORREF -> "int"
; bAlpha : BYTE -> "int"
; dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSetLayeredWindowAttributes = user32.NewProc("SetLayeredWindowAttributes")
)

// hwnd (HWND), crKey (COLORREF), bAlpha (BYTE), dwFlags (LAYERED_WINDOW_ATTRIBUTES_FLAGS)
r1, _, err := procSetLayeredWindowAttributes.Call(
	uintptr(hwnd),
	uintptr(crKey),
	uintptr(bAlpha),
	uintptr(dwFlags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetLayeredWindowAttributes(
  hwnd: THandle;   // HWND
  crKey: DWORD;   // COLORREF
  bAlpha: Byte;   // BYTE
  dwFlags: DWORD   // LAYERED_WINDOW_ATTRIBUTES_FLAGS
): BOOL; stdcall;
  external 'USER32.dll' name 'SetLayeredWindowAttributes';

result := DllCall("USER32\SetLayeredWindowAttributes"
    , "Ptr", hwnd   ; HWND
    , "UInt", crKey   ; COLORREF
    , "UChar", bAlpha   ; BYTE
    , "UInt", dwFlags   ; LAYERED_WINDOW_ATTRIBUTES_FLAGS
    , "Int")   ; return: BOOL

●SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags) = DLL("USER32.dll", "bool SetLayeredWindowAttributes(void*, dword, byte, dword)")
# 呼び出し: SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags)
# hwnd : HWND -> "void*"
# crKey : COLORREF -> "dword"
# bAlpha : BYTE -> "byte"
# dwFlags : LAYERED_WINDOW_ATTRIBUTES_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 SetLayeredWindowAttributes(
    hwnd: ?*anyopaque, // HWND
    crKey: u32, // COLORREF
    bAlpha: u8, // BYTE
    dwFlags: u32 // LAYERED_WINDOW_ATTRIBUTES_FLAGS
) callconv(std.os.windows.WINAPI) i32;

proc SetLayeredWindowAttributes(
    hwnd: pointer,  # HWND
    crKey: uint32,  # COLORREF
    bAlpha: uint8,  # BYTE
    dwFlags: uint32  # LAYERED_WINDOW_ATTRIBUTES_FLAGS
): int32 {.importc: "SetLayeredWindowAttributes", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
int SetLayeredWindowAttributes(
    void* hwnd,   // HWND
    uint crKey,   // COLORREF
    ubyte bAlpha,   // BYTE
    uint dwFlags   // LAYERED_WINDOW_ATTRIBUTES_FLAGS
);

ccall((:SetLayeredWindowAttributes, "USER32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, UInt32, UInt8, UInt32),
      hwnd, crKey, bAlpha, dwFlags)
# hwnd : HWND -> Ptr{Cvoid}
# crKey : COLORREF -> UInt32
# bAlpha : BYTE -> UInt8
# dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS -> UInt32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t SetLayeredWindowAttributes(
    void* hwnd,
    uint32_t crKey,
    uint8_t bAlpha,
    uint32_t dwFlags);
]]
local user32 = ffi.load("user32")
-- user32.SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags)
-- hwnd : HWND
-- crKey : COLORREF
-- bAlpha : BYTE
-- dwFlags : LAYERED_WINDOW_ATTRIBUTES_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 SetLayeredWindowAttributes = lib.func('__stdcall', 'SetLayeredWindowAttributes', 'int32_t', ['void *', 'uint32_t', 'uint8_t', 'uint32_t']);
// SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags)
// hwnd : HWND -> 'void *'
// crKey : COLORREF -> 'uint32_t'
// bAlpha : BYTE -> 'uint8_t'
// dwFlags : LAYERED_WINDOW_ATTRIBUTES_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", {
  SetLayeredWindowAttributes: { parameters: ["pointer", "u32", "u8", "u32"], result: "i32" },
});
// lib.symbols.SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags)
// hwnd : HWND -> "pointer"
// crKey : COLORREF -> "u32"
// bAlpha : BYTE -> "u8"
// dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS -> "u32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t SetLayeredWindowAttributes(
    void* hwnd,
    uint32_t crKey,
    uint8_t bAlpha,
    uint32_t dwFlags);
C, "USER32.dll");
// $ffi->SetLayeredWindowAttributes(hwnd, crKey, bAlpha, dwFlags);
// hwnd : HWND
// crKey : COLORREF
// bAlpha : BYTE
// dwFlags : LAYERED_WINDOW_ATTRIBUTES_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);
    boolean SetLayeredWindowAttributes(
        Pointer hwnd,   // HWND
        int crKey,   // COLORREF
        byte bAlpha,   // BYTE
        int dwFlags   // LAYERED_WINDOW_ATTRIBUTES_FLAGS
    );
}

@[Link("user32")]
lib LibUSER32
  fun SetLayeredWindowAttributes = SetLayeredWindowAttributes(
    hwnd : Void*,   # HWND
    crKey : UInt32,   # COLORREF
    bAlpha : UInt8,   # BYTE
    dwFlags : UInt32   # LAYERED_WINDOW_ATTRIBUTES_FLAGS
  ) : Int32
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 SetLayeredWindowAttributesNative = Int32 Function(Pointer<Void>, Uint32, Uint8, Uint32);
typedef SetLayeredWindowAttributesDart = int Function(Pointer<Void>, int, int, int);
final SetLayeredWindowAttributes = DynamicLibrary.open('USER32.dll')
    .lookupFunction<SetLayeredWindowAttributesNative, SetLayeredWindowAttributesDart>('SetLayeredWindowAttributes');
// hwnd : HWND -> Pointer<Void>
// crKey : COLORREF -> Uint32
// bAlpha : BYTE -> Uint8
// dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS -> Uint32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SetLayeredWindowAttributes(
  hwnd: THandle;   // HWND
  crKey: DWORD;   // COLORREF
  bAlpha: Byte;   // BYTE
  dwFlags: DWORD   // LAYERED_WINDOW_ATTRIBUTES_FLAGS
): BOOL; stdcall;
  external 'USER32.dll' name 'SetLayeredWindowAttributes';

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

foreign import stdcall safe "SetLayeredWindowAttributes"
  c_SetLayeredWindowAttributes :: Ptr () -> Word32 -> Word8 -> Word32 -> IO CInt
-- hwnd : HWND -> Ptr ()
-- crKey : COLORREF -> Word32
-- bAlpha : BYTE -> Word8
-- dwFlags : LAYERED_WINDOW_ATTRIBUTES_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 setlayeredwindowattributes =
  foreign "SetLayeredWindowAttributes"
    ((ptr void) @-> uint32_t @-> uint8_t @-> uint32_t @-> returning int32_t)
(* hwnd : HWND -> (ptr void) *)
(* crKey : COLORREF -> uint32_t *)
(* bAlpha : BYTE -> uint8_t *)
(* dwFlags : LAYERED_WINDOW_ATTRIBUTES_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 ("SetLayeredWindowAttributes" set-layered-window-attributes :convention :stdcall) :int32
  (hwnd :pointer)   ; HWND
  (cr-key :uint32)   ; COLORREF
  (b-alpha :uint8)   ; BYTE
  (dw-flags :uint32))   ; LAYERED_WINDOW_ATTRIBUTES_FLAGS
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SetLayeredWindowAttributes = Win32::API::More->new('USER32',
    'BOOL SetLayeredWindowAttributes(HANDLE hwnd, DWORD crKey, BYTE bAlpha, DWORD dwFlags)');
# my $ret = $SetLayeredWindowAttributes->Call($hwnd, $crKey, $bAlpha, $dwFlags);
# hwnd : HWND -> HANDLE
# crKey : COLORREF -> DWORD
# bAlpha : BYTE -> BYTE
# dwFlags : LAYERED_WINDOW_ATTRIBUTES_FLAGS -> DWORD
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。