WinHelpW

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

BOOL WinHelpW(
    HWND hWndMain,   // optional
    LPCWSTR lpszHelp,   // optional
    DWORD uCommand,
    UINT_PTR dwData
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WinHelpW(
    hWndMain As IntPtr,   ' HWND optional
    <MarshalAs(UnmanagedType.LPWStr)> lpszHelp As String,   ' LPCWSTR optional
    uCommand As UInteger,   ' DWORD
    dwData As UIntPtr   ' UINT_PTR
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hWndMain : HWND optional
' lpszHelp : LPCWSTR optional
' uCommand : DWORD
' dwData : UINT_PTR
Declare PtrSafe Function WinHelpW Lib "user32" ( _
    ByVal hWndMain As LongPtr, _
    ByVal lpszHelp As LongPtr, _
    ByVal uCommand As Long, _
    ByVal dwData As LongPtr) As Long
' 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

WinHelpW = ctypes.windll.user32.WinHelpW
WinHelpW.restype = wintypes.BOOL
WinHelpW.argtypes = [
    wintypes.HANDLE,  # hWndMain : HWND optional
    wintypes.LPCWSTR,  # lpszHelp : LPCWSTR optional
    wintypes.DWORD,  # uCommand : DWORD
    ctypes.c_size_t,  # dwData : UINT_PTR
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
WinHelpW = Fiddle::Function.new(
  lib['WinHelpW'],
  [
    Fiddle::TYPE_VOIDP,  # hWndMain : HWND optional
    Fiddle::TYPE_VOIDP,  # lpszHelp : LPCWSTR optional
    -Fiddle::TYPE_INT,  # uCommand : DWORD
    Fiddle::TYPE_UINTPTR_T,  # dwData : UINT_PTR
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn WinHelpW(
        hWndMain: *mut core::ffi::c_void,  // HWND optional
        lpszHelp: *const u16,  // LPCWSTR optional
        uCommand: u32,  // DWORD
        dwData: usize  // UINT_PTR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool WinHelpW(IntPtr hWndMain, [MarshalAs(UnmanagedType.LPWStr)] string lpszHelp, uint uCommand, UIntPtr dwData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_WinHelpW' -Namespace Win32 -PassThru
# $api::WinHelpW(hWndMain, lpszHelp, uCommand, dwData)

#uselib "USER32.dll"
#func global WinHelpW "WinHelpW" wptr, wptr, wptr, wptr
; WinHelpW hWndMain, lpszHelp, uCommand, dwData   ; 戻り値は stat
; hWndMain : HWND optional -> "wptr"
; lpszHelp : LPCWSTR optional -> "wptr"
; uCommand : DWORD -> "wptr"
; dwData : UINT_PTR -> "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 WinHelpW "WinHelpW" sptr, wstr, int, sptr
; res = WinHelpW(hWndMain, lpszHelp, uCommand, dwData)
; hWndMain : HWND optional -> "sptr"
; lpszHelp : LPCWSTR optional -> "wstr"
; uCommand : DWORD -> "int"
; dwData : UINT_PTR -> "sptr"

; BOOL WinHelpW(HWND hWndMain, LPCWSTR lpszHelp, DWORD uCommand, UINT_PTR dwData)
#uselib "USER32.dll"
#cfunc global WinHelpW "WinHelpW" intptr, wstr, int, intptr
; res = WinHelpW(hWndMain, lpszHelp, uCommand, dwData)
; hWndMain : HWND optional -> "intptr"
; lpszHelp : LPCWSTR optional -> "wstr"
; uCommand : DWORD -> "int"
; dwData : UINT_PTR -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procWinHelpW = user32.NewProc("WinHelpW")
)

// hWndMain (HWND optional), lpszHelp (LPCWSTR optional), uCommand (DWORD), dwData (UINT_PTR)
r1, _, err := procWinHelpW.Call(
	uintptr(hWndMain),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszHelp))),
	uintptr(uCommand),
	uintptr(dwData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function WinHelpW(
  hWndMain: THandle;   // HWND optional
  lpszHelp: PWideChar;   // LPCWSTR optional
  uCommand: DWORD;   // DWORD
  dwData: NativeUInt   // UINT_PTR
): BOOL; stdcall;
  external 'USER32.dll' name 'WinHelpW';

result := DllCall("USER32\WinHelpW"
    , "Ptr", hWndMain   ; HWND optional
    , "WStr", lpszHelp   ; LPCWSTR optional
    , "UInt", uCommand   ; DWORD
    , "UPtr", dwData   ; UINT_PTR
    , "Int")   ; return: BOOL

●WinHelpW(hWndMain, lpszHelp, uCommand, dwData) = DLL("USER32.dll", "bool WinHelpW(void*, char*, dword, int)")
# 呼び出し: WinHelpW(hWndMain, lpszHelp, uCommand, dwData)
# hWndMain : HWND optional -> "void*"
# lpszHelp : LPCWSTR optional -> "char*"
# uCommand : DWORD -> "dword"
# dwData : UINT_PTR -> "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 WinHelpW(
    hWndMain: ?*anyopaque, // HWND optional
    lpszHelp: [*c]const u16, // LPCWSTR optional
    uCommand: u32, // DWORD
    dwData: usize // UINT_PTR
) callconv(std.os.windows.WINAPI) i32;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc WinHelpW(
    hWndMain: pointer,  # HWND optional
    lpszHelp: WideCString,  # LPCWSTR optional
    uCommand: uint32,  # DWORD
    dwData: uint  # UINT_PTR
): int32 {.importc: "WinHelpW", stdcall, dynlib: "USER32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "user32");
extern(Windows)
int WinHelpW(
    void* hWndMain,   // HWND optional
    const(wchar)* lpszHelp,   // LPCWSTR optional
    uint uCommand,   // DWORD
    size_t dwData   // UINT_PTR
);

ccall((:WinHelpW, "USER32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Cwstring, UInt32, Csize_t),
      hWndMain, lpszHelp, uCommand, dwData)
# hWndMain : HWND optional -> Ptr{Cvoid}
# lpszHelp : LPCWSTR optional -> Cwstring
# uCommand : DWORD -> UInt32
# dwData : UINT_PTR -> Csize_t
# 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[[
int32_t WinHelpW(
    void* hWndMain,
    const uint16_t* lpszHelp,
    uint32_t uCommand,
    uintptr_t dwData);
]]
local user32 = ffi.load("user32")
-- user32.WinHelpW(hWndMain, lpszHelp, uCommand, dwData)
-- hWndMain : HWND optional
-- lpszHelp : LPCWSTR optional
-- uCommand : DWORD
-- dwData : UINT_PTR
-- 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 WinHelpW = lib.func('__stdcall', 'WinHelpW', 'int32_t', ['void *', 'str16', 'uint32_t', 'uintptr_t']);
// WinHelpW(hWndMain, lpszHelp, uCommand, dwData)
// hWndMain : HWND optional -> 'void *'
// lpszHelp : LPCWSTR optional -> 'str16'
// uCommand : DWORD -> 'uint32_t'
// dwData : UINT_PTR -> 'uintptr_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", {
  WinHelpW: { parameters: ["pointer", "buffer", "u32", "usize"], result: "i32" },
});
// lib.symbols.WinHelpW(hWndMain, lpszHelp, uCommand, dwData)
// hWndMain : HWND optional -> "pointer"
// lpszHelp : LPCWSTR optional -> "buffer"
// uCommand : DWORD -> "u32"
// dwData : UINT_PTR -> "usize"
// 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
int32_t WinHelpW(
    void* hWndMain,
    const uint16_t* lpszHelp,
    uint32_t uCommand,
    size_t dwData);
C, "USER32.dll");
// $ffi->WinHelpW(hWndMain, lpszHelp, uCommand, dwData);
// hWndMain : HWND optional
// lpszHelp : LPCWSTR optional
// uCommand : DWORD
// dwData : UINT_PTR
// 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);
    boolean WinHelpW(
        Pointer hWndMain,   // HWND optional
        WString lpszHelp,   // LPCWSTR optional
        int uCommand,   // DWORD
        long dwData   // UINT_PTR
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("user32")]
lib LibUSER32
  fun WinHelpW = WinHelpW(
    hWndMain : Void*,   # HWND optional
    lpszHelp : UInt16*,   # LPCWSTR optional
    uCommand : UInt32,   # DWORD
    dwData : LibC::SizeT   # UINT_PTR
  ) : 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 WinHelpWNative = Int32 Function(Pointer<Void>, Pointer<Utf16>, Uint32, UintPtr);
typedef WinHelpWDart = int Function(Pointer<Void>, Pointer<Utf16>, int, int);
final WinHelpW = DynamicLibrary.open('USER32.dll')
    .lookupFunction<WinHelpWNative, WinHelpWDart>('WinHelpW');
// hWndMain : HWND optional -> Pointer<Void>
// lpszHelp : LPCWSTR optional -> Pointer<Utf16>
// uCommand : DWORD -> Uint32
// dwData : UINT_PTR -> UintPtr
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function WinHelpW(
  hWndMain: THandle;   // HWND optional
  lpszHelp: PWideChar;   // LPCWSTR optional
  uCommand: DWORD;   // DWORD
  dwData: NativeUInt   // UINT_PTR
): BOOL; stdcall;
  external 'USER32.dll' name 'WinHelpW';

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

foreign import stdcall safe "WinHelpW"
  c_WinHelpW :: Ptr () -> CWString -> Word32 -> CUIntPtr -> IO CInt
-- hWndMain : HWND optional -> Ptr ()
-- lpszHelp : LPCWSTR optional -> CWString
-- uCommand : DWORD -> Word32
-- dwData : UINT_PTR -> CUIntPtr
-- 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 winhelpw =
  foreign "WinHelpW"
    ((ptr void) @-> (ptr uint16_t) @-> uint32_t @-> size_t @-> returning int32_t)
(* hWndMain : HWND optional -> (ptr void) *)
(* lpszHelp : LPCWSTR optional -> (ptr uint16_t) *)
(* uCommand : DWORD -> uint32_t *)
(* dwData : UINT_PTR -> size_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 ("WinHelpW" win-help-w :convention :stdcall) :int32
  (h-wnd-main :pointer)   ; HWND optional
  (lpsz-help (:string :encoding :utf-16le))   ; LPCWSTR optional
  (u-command :uint32)   ; DWORD
  (dw-data :uint64))   ; UINT_PTR
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $WinHelpW = Win32::API::More->new('USER32',
    'BOOL WinHelpW(HANDLE hWndMain, LPCWSTR lpszHelp, DWORD uCommand, WPARAM dwData)');
# my $ret = $WinHelpW->Call($hWndMain, $lpszHelp, $uCommand, $dwData);
# hWndMain : HWND optional -> HANDLE
# lpszHelp : LPCWSTR optional -> LPCWSTR
# uCommand : DWORD -> DWORD
# dwData : UINT_PTR -> WPARAM
# 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。