SendMessageW

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

LRESULT SendMessageW(
    HWND hWnd,
    DWORD Msg,
    WPARAM wParam,   // optional
    LPARAM lParam   // optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SendMessageW(
    hWnd As IntPtr,   ' HWND
    Msg As UInteger,   ' DWORD
    wParam As UIntPtr,   ' WPARAM optional
    lParam As IntPtr   ' LPARAM optional
) As IntPtr
End Function

' hWnd : HWND
' Msg : DWORD
' wParam : WPARAM optional
' lParam : LPARAM optional
Declare PtrSafe Function SendMessageW Lib "user32" ( _
    ByVal hWnd As LongPtr, _
    ByVal Msg As Long, _
    ByVal wParam As LongPtr, _
    ByVal lParam As LongPtr) 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

SendMessageW = ctypes.windll.user32.SendMessageW
SendMessageW.restype = ctypes.c_ssize_t
SendMessageW.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    wintypes.DWORD,  # Msg : DWORD
    ctypes.c_size_t,  # wParam : WPARAM optional
    ctypes.c_ssize_t,  # lParam : LPARAM optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SendMessageW = Fiddle::Function.new(
  lib['SendMessageW'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    -Fiddle::TYPE_INT,  # Msg : DWORD
    Fiddle::TYPE_UINTPTR_T,  # wParam : WPARAM optional
    Fiddle::TYPE_INTPTR_T,  # lParam : LPARAM optional
  ],
  Fiddle::TYPE_INTPTR_T)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn SendMessageW(
        hWnd: *mut core::ffi::c_void,  // HWND
        Msg: u32,  // DWORD
        wParam: usize,  // WPARAM optional
        lParam: isize  // LPARAM optional
    ) -> isize;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr SendMessageW(IntPtr hWnd, uint Msg, UIntPtr wParam, IntPtr lParam);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SendMessageW' -Namespace Win32 -PassThru
# $api::SendMessageW(hWnd, Msg, wParam, lParam)

#uselib "USER32.dll"
#func global SendMessageW "SendMessageW" wptr, wptr, wptr, wptr
; SendMessageW hWnd, Msg, wParam, lParam   ; 戻り値は stat
; hWnd : HWND -> "wptr"
; Msg : DWORD -> "wptr"
; wParam : WPARAM optional -> "wptr"
; lParam : LPARAM optional -> "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 SendMessageW "SendMessageW" sptr, int, sptr, sptr
; res = SendMessageW(hWnd, Msg, wParam, lParam)
; hWnd : HWND -> "sptr"
; Msg : DWORD -> "int"
; wParam : WPARAM optional -> "sptr"
; lParam : LPARAM optional -> "sptr"

; LRESULT SendMessageW(HWND hWnd, DWORD Msg, WPARAM wParam, LPARAM lParam)
#uselib "USER32.dll"
#cfunc global SendMessageW "SendMessageW" intptr, int, intptr, intptr
; res = SendMessageW(hWnd, Msg, wParam, lParam)
; hWnd : HWND -> "intptr"
; Msg : DWORD -> "int"
; wParam : WPARAM optional -> "intptr"
; lParam : LPARAM optional -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSendMessageW = user32.NewProc("SendMessageW")
)

// hWnd (HWND), Msg (DWORD), wParam (WPARAM optional), lParam (LPARAM optional)
r1, _, err := procSendMessageW.Call(
	uintptr(hWnd),
	uintptr(Msg),
	uintptr(wParam),
	uintptr(lParam),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // LRESULT

function SendMessageW(
  hWnd: THandle;   // HWND
  Msg: DWORD;   // DWORD
  wParam: NativeUInt;   // WPARAM optional
  lParam: NativeInt   // LPARAM optional
): NativeInt; stdcall;
  external 'USER32.dll' name 'SendMessageW';

result := DllCall("USER32\SendMessageW"
    , "Ptr", hWnd   ; HWND
    , "UInt", Msg   ; DWORD
    , "UPtr", wParam   ; WPARAM optional
    , "Ptr", lParam   ; LPARAM optional
    , "Ptr")   ; return: LRESULT

●SendMessageW(hWnd, Msg, wParam, lParam) = DLL("USER32.dll", "int SendMessageW(void*, dword, int, int)")
# 呼び出し: SendMessageW(hWnd, Msg, wParam, lParam)
# hWnd : HWND -> "void*"
# Msg : DWORD -> "dword"
# wParam : WPARAM optional -> "int"
# lParam : LPARAM optional -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。

const std = @import("std");

extern "user32" fn SendMessageW(
    hWnd: ?*anyopaque, // HWND
    Msg: u32, // DWORD
    wParam: usize, // WPARAM optional
    lParam: isize // LPARAM optional
) callconv(std.os.windows.WINAPI) isize;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc SendMessageW(
    hWnd: pointer,  # HWND
    Msg: uint32,  # DWORD
    wParam: uint,  # WPARAM optional
    lParam: int  # LPARAM optional
): int {.importc: "SendMessageW", stdcall, dynlib: "USER32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "user32");
extern(Windows)
ptrdiff_t SendMessageW(
    void* hWnd,   // HWND
    uint Msg,   // DWORD
    size_t wParam,   // WPARAM optional
    ptrdiff_t lParam   // LPARAM optional
);

ccall((:SendMessageW, "USER32.dll"), stdcall, Int,
      (Ptr{Cvoid}, UInt32, Csize_t, Int),
      hWnd, Msg, wParam, lParam)
# hWnd : HWND -> Ptr{Cvoid}
# Msg : DWORD -> UInt32
# wParam : WPARAM optional -> Csize_t
# lParam : LPARAM optional -> Int
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
intptr_t SendMessageW(
    void* hWnd,
    uint32_t Msg,
    uintptr_t wParam,
    intptr_t lParam);
]]
local user32 = ffi.load("user32")
-- user32.SendMessageW(hWnd, Msg, wParam, lParam)
-- hWnd : HWND
-- Msg : DWORD
-- wParam : WPARAM optional
-- lParam : LPARAM optional
-- 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。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('USER32.dll');
const SendMessageW = lib.func('__stdcall', 'SendMessageW', 'intptr_t', ['void *', 'uint32_t', 'uintptr_t', 'intptr_t']);
// SendMessageW(hWnd, Msg, wParam, lParam)
// hWnd : HWND -> 'void *'
// Msg : DWORD -> 'uint32_t'
// wParam : WPARAM optional -> 'uintptr_t'
// lParam : LPARAM optional -> 'intptr_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", {
  SendMessageW: { parameters: ["pointer", "u32", "usize", "isize"], result: "isize" },
});
// lib.symbols.SendMessageW(hWnd, Msg, wParam, lParam)
// hWnd : HWND -> "pointer"
// Msg : DWORD -> "u32"
// wParam : WPARAM optional -> "usize"
// lParam : LPARAM optional -> "isize"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)を Uint8Array で渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
intptr_t SendMessageW(
    void* hWnd,
    uint32_t Msg,
    size_t wParam,
    intptr_t lParam);
C, "USER32.dll");
// $ffi->SendMessageW(hWnd, Msg, wParam, lParam);
// hWnd : HWND
// Msg : DWORD
// wParam : WPARAM optional
// lParam : LPARAM optional
// 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.UNICODE_OPTIONS);
    long SendMessageW(
        Pointer hWnd,   // HWND
        int Msg,   // DWORD
        long wParam,   // WPARAM optional
        long lParam   // LPARAM optional
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("user32")]
lib LibUSER32
  fun SendMessageW = SendMessageW(
    hWnd : Void*,   # HWND
    Msg : UInt32,   # DWORD
    wParam : LibC::SizeT,   # WPARAM optional
    lParam : LibC::SSizeT   # LPARAM optional
  ) : LibC::SSizeT
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 SendMessageWNative = IntPtr Function(Pointer<Void>, Uint32, UintPtr, IntPtr);
typedef SendMessageWDart = int Function(Pointer<Void>, int, int, int);
final SendMessageW = DynamicLibrary.open('USER32.dll')
    .lookupFunction<SendMessageWNative, SendMessageWDart>('SendMessageW');
// hWnd : HWND -> Pointer<Void>
// Msg : DWORD -> Uint32
// wParam : WPARAM optional -> UintPtr
// lParam : LPARAM optional -> IntPtr
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SendMessageW(
  hWnd: THandle;   // HWND
  Msg: DWORD;   // DWORD
  wParam: NativeUInt;   // WPARAM optional
  lParam: NativeInt   // LPARAM optional
): NativeInt; stdcall;
  external 'USER32.dll' name 'SendMessageW';

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

foreign import stdcall safe "SendMessageW"
  c_SendMessageW :: Ptr () -> Word32 -> CUIntPtr -> CIntPtr -> IO CIntPtr
-- hWnd : HWND -> Ptr ()
-- Msg : DWORD -> Word32
-- wParam : WPARAM optional -> CUIntPtr
-- lParam : LPARAM optional -> CIntPtr
-- 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 sendmessagew =
  foreign "SendMessageW"
    ((ptr void) @-> uint32_t @-> size_t @-> intptr_t @-> returning intptr_t)
(* hWnd : HWND -> (ptr void) *)
(* Msg : DWORD -> uint32_t *)
(* wParam : WPARAM optional -> size_t *)
(* lParam : LPARAM optional -> intptr_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 ("SendMessageW" send-message-w :convention :stdcall) :int64
  (h-wnd :pointer)   ; HWND
  (msg :uint32)   ; DWORD
  (w-param :uint64)   ; WPARAM optional
  (l-param :int64))   ; LPARAM optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SendMessageW = Win32::API::More->new('USER32',
    'LPARAM SendMessageW(HANDLE hWnd, DWORD Msg, WPARAM wParam, LPARAM lParam)');
# my $ret = $SendMessageW->Call($hWnd, $Msg, $wParam, $lParam);
# hWnd : HWND -> HANDLE
# Msg : DWORD -> DWORD
# wParam : WPARAM optional -> WPARAM
# lParam : LPARAM optional -> LPARAM
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。