ChangeMenuW

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

BOOL ChangeMenuW(
    HMENU hMenu,
    DWORD cmd,
    LPCWSTR lpszNewItem,   // optional
    DWORD cmdInsert,
    DWORD flags
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function ChangeMenuW(
    hMenu As IntPtr,   ' HMENU
    cmd As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpszNewItem As String,   ' LPCWSTR optional
    cmdInsert As UInteger,   ' DWORD
    flags As UInteger   ' DWORD
) As Boolean
End Function

' hMenu : HMENU
' cmd : DWORD
' lpszNewItem : LPCWSTR optional
' cmdInsert : DWORD
' flags : DWORD
Declare PtrSafe Function ChangeMenuW Lib "user32" ( _
    ByVal hMenu As LongPtr, _
    ByVal cmd As Long, _
    ByVal lpszNewItem As LongPtr, _
    ByVal cmdInsert As Long, _
    ByVal flags As Long) 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

ChangeMenuW = ctypes.windll.user32.ChangeMenuW
ChangeMenuW.restype = wintypes.BOOL
ChangeMenuW.argtypes = [
    wintypes.HANDLE,  # hMenu : HMENU
    wintypes.DWORD,  # cmd : DWORD
    wintypes.LPCWSTR,  # lpszNewItem : LPCWSTR optional
    wintypes.DWORD,  # cmdInsert : DWORD
    wintypes.DWORD,  # flags : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
ChangeMenuW = Fiddle::Function.new(
  lib['ChangeMenuW'],
  [
    Fiddle::TYPE_VOIDP,  # hMenu : HMENU
    -Fiddle::TYPE_INT,  # cmd : DWORD
    Fiddle::TYPE_VOIDP,  # lpszNewItem : LPCWSTR optional
    -Fiddle::TYPE_INT,  # cmdInsert : DWORD
    -Fiddle::TYPE_INT,  # flags : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn ChangeMenuW(
        hMenu: *mut core::ffi::c_void,  // HMENU
        cmd: u32,  // DWORD
        lpszNewItem: *const u16,  // LPCWSTR optional
        cmdInsert: u32,  // DWORD
        flags: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern bool ChangeMenuW(IntPtr hMenu, uint cmd, [MarshalAs(UnmanagedType.LPWStr)] string lpszNewItem, uint cmdInsert, uint flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_ChangeMenuW' -Namespace Win32 -PassThru
# $api::ChangeMenuW(hMenu, cmd, lpszNewItem, cmdInsert, flags)

#uselib "USER32.dll"
#func global ChangeMenuW "ChangeMenuW" wptr, wptr, wptr, wptr, wptr
; ChangeMenuW hMenu, cmd, lpszNewItem, cmdInsert, flags   ; 戻り値は stat
; hMenu : HMENU -> "wptr"
; cmd : DWORD -> "wptr"
; lpszNewItem : LPCWSTR optional -> "wptr"
; cmdInsert : DWORD -> "wptr"
; flags : DWORD -> "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 ChangeMenuW "ChangeMenuW" sptr, int, wstr, int, int
; res = ChangeMenuW(hMenu, cmd, lpszNewItem, cmdInsert, flags)
; hMenu : HMENU -> "sptr"
; cmd : DWORD -> "int"
; lpszNewItem : LPCWSTR optional -> "wstr"
; cmdInsert : DWORD -> "int"
; flags : DWORD -> "int"

; BOOL ChangeMenuW(HMENU hMenu, DWORD cmd, LPCWSTR lpszNewItem, DWORD cmdInsert, DWORD flags)
#uselib "USER32.dll"
#cfunc global ChangeMenuW "ChangeMenuW" intptr, int, wstr, int, int
; res = ChangeMenuW(hMenu, cmd, lpszNewItem, cmdInsert, flags)
; hMenu : HMENU -> "intptr"
; cmd : DWORD -> "int"
; lpszNewItem : LPCWSTR optional -> "wstr"
; cmdInsert : DWORD -> "int"
; flags : DWORD -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procChangeMenuW = user32.NewProc("ChangeMenuW")
)

// hMenu (HMENU), cmd (DWORD), lpszNewItem (LPCWSTR optional), cmdInsert (DWORD), flags (DWORD)
r1, _, err := procChangeMenuW.Call(
	uintptr(hMenu),
	uintptr(cmd),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszNewItem))),
	uintptr(cmdInsert),
	uintptr(flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function ChangeMenuW(
  hMenu: THandle;   // HMENU
  cmd: DWORD;   // DWORD
  lpszNewItem: PWideChar;   // LPCWSTR optional
  cmdInsert: DWORD;   // DWORD
  flags: DWORD   // DWORD
): BOOL; stdcall;
  external 'USER32.dll' name 'ChangeMenuW';

result := DllCall("USER32\ChangeMenuW"
    , "Ptr", hMenu   ; HMENU
    , "UInt", cmd   ; DWORD
    , "WStr", lpszNewItem   ; LPCWSTR optional
    , "UInt", cmdInsert   ; DWORD
    , "UInt", flags   ; DWORD
    , "Int")   ; return: BOOL

●ChangeMenuW(hMenu, cmd, lpszNewItem, cmdInsert, flags) = DLL("USER32.dll", "bool ChangeMenuW(void*, dword, char*, dword, dword)")
# 呼び出し: ChangeMenuW(hMenu, cmd, lpszNewItem, cmdInsert, flags)
# hMenu : HMENU -> "void*"
# cmd : DWORD -> "dword"
# lpszNewItem : LPCWSTR optional -> "char*"
# cmdInsert : DWORD -> "dword"
# flags : DWORD -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。