WinHelpA

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

BOOL WinHelpA(
    HWND hWndMain,   // optional
    LPCSTR lpszHelp,   // optional
    DWORD uCommand,
    UINT_PTR dwData
);

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

' hWndMain : HWND optional
' lpszHelp : LPCSTR optional
' uCommand : DWORD
' dwData : UINT_PTR
Declare PtrSafe Function WinHelpA Lib "user32" ( _
    ByVal hWndMain As LongPtr, _
    ByVal lpszHelp As String, _
    ByVal uCommand As Long, _
    ByVal dwData As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WinHelpA = ctypes.windll.user32.WinHelpA
WinHelpA.restype = wintypes.BOOL
WinHelpA.argtypes = [
    wintypes.HANDLE,  # hWndMain : HWND optional
    wintypes.LPCSTR,  # lpszHelp : LPCSTR 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')
WinHelpA = Fiddle::Function.new(
  lib['WinHelpA'],
  [
    Fiddle::TYPE_VOIDP,  # hWndMain : HWND optional
    Fiddle::TYPE_VOIDP,  # lpszHelp : LPCSTR optional
    -Fiddle::TYPE_INT,  # uCommand : DWORD
    Fiddle::TYPE_UINTPTR_T,  # dwData : UINT_PTR
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn WinHelpA(
        hWndMain: *mut core::ffi::c_void,  // HWND optional
        lpszHelp: *const u8,  // LPCSTR 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.Ansi, SetLastError = true)]
public static extern bool WinHelpA(IntPtr hWndMain, [MarshalAs(UnmanagedType.LPStr)] string lpszHelp, uint uCommand, UIntPtr dwData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_WinHelpA' -Namespace Win32 -PassThru
# $api::WinHelpA(hWndMain, lpszHelp, uCommand, dwData)

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

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

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procWinHelpA = user32.NewProc("WinHelpA")
)

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

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

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

●WinHelpA(hWndMain, lpszHelp, uCommand, dwData) = DLL("USER32.dll", "bool WinHelpA(void*, char*, dword, int)")
# 呼び出し: WinHelpA(hWndMain, lpszHelp, uCommand, dwData)
# hWndMain : HWND optional -> "void*"
# lpszHelp : LPCSTR 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)。