SetMenuDefaultItem

// USER32.dll
#include <windows.h>

BOOL SetMenuDefaultItem(
    HMENU hMenu,
    DWORD uItem,
    DWORD fByPos
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetMenuDefaultItem(
    hMenu As IntPtr,   ' HMENU
    uItem As UInteger,   ' DWORD
    fByPos As UInteger   ' DWORD
) As Boolean
End Function

' hMenu : HMENU
' uItem : DWORD
' fByPos : DWORD
Declare PtrSafe Function SetMenuDefaultItem Lib "user32" ( _
    ByVal hMenu As LongPtr, _
    ByVal uItem As Long, _
    ByVal fByPos As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetMenuDefaultItem = ctypes.windll.user32.SetMenuDefaultItem
SetMenuDefaultItem.restype = wintypes.BOOL
SetMenuDefaultItem.argtypes = [
    wintypes.HANDLE,  # hMenu : HMENU
    wintypes.DWORD,  # uItem : DWORD
    wintypes.DWORD,  # fByPos : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SetMenuDefaultItem = Fiddle::Function.new(
  lib['SetMenuDefaultItem'],
  [
    Fiddle::TYPE_VOIDP,  # hMenu : HMENU
    -Fiddle::TYPE_INT,  # uItem : DWORD
    -Fiddle::TYPE_INT,  # fByPos : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn SetMenuDefaultItem(
        hMenu: *mut core::ffi::c_void,  // HMENU
        uItem: u32,  // DWORD
        fByPos: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true)]
public static extern bool SetMenuDefaultItem(IntPtr hMenu, uint uItem, uint fByPos);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SetMenuDefaultItem' -Namespace Win32 -PassThru
# $api::SetMenuDefaultItem(hMenu, uItem, fByPos)

#uselib "USER32.dll"
#func global SetMenuDefaultItem "SetMenuDefaultItem" sptr, sptr, sptr
; SetMenuDefaultItem hMenu, uItem, fByPos   ; 戻り値は stat
; hMenu : HMENU -> "sptr"
; uItem : DWORD -> "sptr"
; fByPos : DWORD -> "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 SetMenuDefaultItem "SetMenuDefaultItem" sptr, int, int
; res = SetMenuDefaultItem(hMenu, uItem, fByPos)
; hMenu : HMENU -> "sptr"
; uItem : DWORD -> "int"
; fByPos : DWORD -> "int"

; BOOL SetMenuDefaultItem(HMENU hMenu, DWORD uItem, DWORD fByPos)
#uselib "USER32.dll"
#cfunc global SetMenuDefaultItem "SetMenuDefaultItem" intptr, int, int
; res = SetMenuDefaultItem(hMenu, uItem, fByPos)
; hMenu : HMENU -> "intptr"
; uItem : DWORD -> "int"
; fByPos : DWORD -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSetMenuDefaultItem = user32.NewProc("SetMenuDefaultItem")
)

// hMenu (HMENU), uItem (DWORD), fByPos (DWORD)
r1, _, err := procSetMenuDefaultItem.Call(
	uintptr(hMenu),
	uintptr(uItem),
	uintptr(fByPos),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetMenuDefaultItem(
  hMenu: THandle;   // HMENU
  uItem: DWORD;   // DWORD
  fByPos: DWORD   // DWORD
): BOOL; stdcall;
  external 'USER32.dll' name 'SetMenuDefaultItem';

result := DllCall("USER32\SetMenuDefaultItem"
    , "Ptr", hMenu   ; HMENU
    , "UInt", uItem   ; DWORD
    , "UInt", fByPos   ; DWORD
    , "Int")   ; return: BOOL

●SetMenuDefaultItem(hMenu, uItem, fByPos) = DLL("USER32.dll", "bool SetMenuDefaultItem(void*, dword, dword)")
# 呼び出し: SetMenuDefaultItem(hMenu, uItem, fByPos)
# hMenu : HMENU -> "void*"
# uItem : DWORD -> "dword"
# fByPos : 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)。