GetMenuStringW

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

INT GetMenuStringW(
    HMENU hMenu,
    DWORD uIDItem,
    LPWSTR lpString,   // optional
    INT cchMax,
    MENU_ITEM_FLAGS flags
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetMenuStringW(
    hMenu As IntPtr,   ' HMENU
    uIDItem As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpString As System.Text.StringBuilder,   ' LPWSTR optional, out
    cchMax As Integer,   ' INT
    flags As UInteger   ' MENU_ITEM_FLAGS
) As Integer
End Function

' hMenu : HMENU
' uIDItem : DWORD
' lpString : LPWSTR optional, out
' cchMax : INT
' flags : MENU_ITEM_FLAGS
Declare PtrSafe Function GetMenuStringW Lib "user32" ( _
    ByVal hMenu As LongPtr, _
    ByVal uIDItem As Long, _
    ByVal lpString As LongPtr, _
    ByVal cchMax 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

GetMenuStringW = ctypes.windll.user32.GetMenuStringW
GetMenuStringW.restype = ctypes.c_int
GetMenuStringW.argtypes = [
    wintypes.HANDLE,  # hMenu : HMENU
    wintypes.DWORD,  # uIDItem : DWORD
    wintypes.LPWSTR,  # lpString : LPWSTR optional, out
    ctypes.c_int,  # cchMax : INT
    wintypes.DWORD,  # flags : MENU_ITEM_FLAGS
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetMenuStringW = Fiddle::Function.new(
  lib['GetMenuStringW'],
  [
    Fiddle::TYPE_VOIDP,  # hMenu : HMENU
    -Fiddle::TYPE_INT,  # uIDItem : DWORD
    Fiddle::TYPE_VOIDP,  # lpString : LPWSTR optional, out
    Fiddle::TYPE_INT,  # cchMax : INT
    -Fiddle::TYPE_INT,  # flags : MENU_ITEM_FLAGS
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn GetMenuStringW(
        hMenu: *mut core::ffi::c_void,  // HMENU
        uIDItem: u32,  // DWORD
        lpString: *mut u16,  // LPWSTR optional, out
        cchMax: i32,  // INT
        flags: u32  // MENU_ITEM_FLAGS
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode)]
public static extern int GetMenuStringW(IntPtr hMenu, uint uIDItem, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpString, int cchMax, uint flags);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetMenuStringW' -Namespace Win32 -PassThru
# $api::GetMenuStringW(hMenu, uIDItem, lpString, cchMax, flags)

#uselib "USER32.dll"
#func global GetMenuStringW "GetMenuStringW" wptr, wptr, wptr, wptr, wptr
; GetMenuStringW hMenu, uIDItem, varptr(lpString), cchMax, flags   ; 戻り値は stat
; hMenu : HMENU -> "wptr"
; uIDItem : DWORD -> "wptr"
; lpString : LPWSTR optional, out -> "wptr"
; cchMax : INT -> "wptr"
; flags : MENU_ITEM_FLAGS -> "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 GetMenuStringW "GetMenuStringW" sptr, int, var, int, int
; res = GetMenuStringW(hMenu, uIDItem, lpString, cchMax, flags)
; hMenu : HMENU -> "sptr"
; uIDItem : DWORD -> "int"
; lpString : LPWSTR optional, out -> "var"
; cchMax : INT -> "int"
; flags : MENU_ITEM_FLAGS -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; INT GetMenuStringW(HMENU hMenu, DWORD uIDItem, LPWSTR lpString, INT cchMax, MENU_ITEM_FLAGS flags)
#uselib "USER32.dll"
#cfunc global GetMenuStringW "GetMenuStringW" intptr, int, var, int, int
; res = GetMenuStringW(hMenu, uIDItem, lpString, cchMax, flags)
; hMenu : HMENU -> "intptr"
; uIDItem : DWORD -> "int"
; lpString : LPWSTR optional, out -> "var"
; cchMax : INT -> "int"
; flags : MENU_ITEM_FLAGS -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetMenuStringW = user32.NewProc("GetMenuStringW")
)

// hMenu (HMENU), uIDItem (DWORD), lpString (LPWSTR optional, out), cchMax (INT), flags (MENU_ITEM_FLAGS)
r1, _, err := procGetMenuStringW.Call(
	uintptr(hMenu),
	uintptr(uIDItem),
	uintptr(lpString),
	uintptr(cchMax),
	uintptr(flags),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetMenuStringW(
  hMenu: THandle;   // HMENU
  uIDItem: DWORD;   // DWORD
  lpString: PWideChar;   // LPWSTR optional, out
  cchMax: Integer;   // INT
  flags: DWORD   // MENU_ITEM_FLAGS
): Integer; stdcall;
  external 'USER32.dll' name 'GetMenuStringW';

result := DllCall("USER32\GetMenuStringW"
    , "Ptr", hMenu   ; HMENU
    , "UInt", uIDItem   ; DWORD
    , "Ptr", lpString   ; LPWSTR optional, out
    , "Int", cchMax   ; INT
    , "UInt", flags   ; MENU_ITEM_FLAGS
    , "Int")   ; return: INT

●GetMenuStringW(hMenu, uIDItem, lpString, cchMax, flags) = DLL("USER32.dll", "int GetMenuStringW(void*, dword, char*, int, dword)")
# 呼び出し: GetMenuStringW(hMenu, uIDItem, lpString, cchMax, flags)
# hMenu : HMENU -> "void*"
# uIDItem : DWORD -> "dword"
# lpString : LPWSTR optional, out -> "char*"
# cchMax : INT -> "int"
# flags : MENU_ITEM_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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。