SoftwareUpdateMessageBox

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

DWORD SoftwareUpdateMessageBox(
    HWND hWnd,   // optional
    LPCWSTR pszDistUnit,
    DWORD dwFlags,
    SOFTDISTINFO* psdi   // optional
);

<DllImport("SHDOCVW.dll", ExactSpelling:=True)>
Public Shared Function SoftwareUpdateMessageBox(
    hWnd As IntPtr,   ' HWND optional
    <MarshalAs(UnmanagedType.LPWStr)> pszDistUnit As String,   ' LPCWSTR
    dwFlags As UInteger,   ' DWORD
    psdi As IntPtr   ' SOFTDISTINFO* optional, out
) As UInteger
End Function

' hWnd : HWND optional
' pszDistUnit : LPCWSTR
' dwFlags : DWORD
' psdi : SOFTDISTINFO* optional, out
Declare PtrSafe Function SoftwareUpdateMessageBox Lib "shdocvw" ( _
    ByVal hWnd As LongPtr, _
    ByVal pszDistUnit As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal psdi 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

SoftwareUpdateMessageBox = ctypes.windll.shdocvw.SoftwareUpdateMessageBox
SoftwareUpdateMessageBox.restype = wintypes.DWORD
SoftwareUpdateMessageBox.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND optional
    wintypes.LPCWSTR,  # pszDistUnit : LPCWSTR
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.c_void_p,  # psdi : SOFTDISTINFO* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHDOCVW.dll')
SoftwareUpdateMessageBox = Fiddle::Function.new(
  lib['SoftwareUpdateMessageBox'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND optional
    Fiddle::TYPE_VOIDP,  # pszDistUnit : LPCWSTR
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # psdi : SOFTDISTINFO* optional, out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "shdocvw")]
extern "system" {
    fn SoftwareUpdateMessageBox(
        hWnd: *mut core::ffi::c_void,  // HWND optional
        pszDistUnit: *const u16,  // LPCWSTR
        dwFlags: u32,  // DWORD
        psdi: *mut SOFTDISTINFO  // SOFTDISTINFO* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHDOCVW.dll")]
public static extern uint SoftwareUpdateMessageBox(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)] string pszDistUnit, uint dwFlags, IntPtr psdi);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHDOCVW_SoftwareUpdateMessageBox' -Namespace Win32 -PassThru
# $api::SoftwareUpdateMessageBox(hWnd, pszDistUnit, dwFlags, psdi)

#uselib "SHDOCVW.dll"
#func global SoftwareUpdateMessageBox "SoftwareUpdateMessageBox" sptr, sptr, sptr, sptr
; SoftwareUpdateMessageBox hWnd, pszDistUnit, dwFlags, varptr(psdi)   ; 戻り値は stat
; hWnd : HWND optional -> "sptr"
; pszDistUnit : LPCWSTR -> "sptr"
; dwFlags : DWORD -> "sptr"
; psdi : SOFTDISTINFO* optional, out -> "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 "SHDOCVW.dll"
#cfunc global SoftwareUpdateMessageBox "SoftwareUpdateMessageBox" sptr, wstr, int, var
; res = SoftwareUpdateMessageBox(hWnd, pszDistUnit, dwFlags, psdi)
; hWnd : HWND optional -> "sptr"
; pszDistUnit : LPCWSTR -> "wstr"
; dwFlags : DWORD -> "int"
; psdi : SOFTDISTINFO* optional, out -> "var"
; ※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。

; DWORD SoftwareUpdateMessageBox(HWND hWnd, LPCWSTR pszDistUnit, DWORD dwFlags, SOFTDISTINFO* psdi)
#uselib "SHDOCVW.dll"
#cfunc global SoftwareUpdateMessageBox "SoftwareUpdateMessageBox" intptr, wstr, int, var
; res = SoftwareUpdateMessageBox(hWnd, pszDistUnit, dwFlags, psdi)
; hWnd : HWND optional -> "intptr"
; pszDistUnit : LPCWSTR -> "wstr"
; dwFlags : DWORD -> "int"
; psdi : SOFTDISTINFO* optional, out -> "var"
; ※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 (
	shdocvw = windows.NewLazySystemDLL("SHDOCVW.dll")
	procSoftwareUpdateMessageBox = shdocvw.NewProc("SoftwareUpdateMessageBox")
)

// hWnd (HWND optional), pszDistUnit (LPCWSTR), dwFlags (DWORD), psdi (SOFTDISTINFO* optional, out)
r1, _, err := procSoftwareUpdateMessageBox.Call(
	uintptr(hWnd),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszDistUnit))),
	uintptr(dwFlags),
	uintptr(psdi),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function SoftwareUpdateMessageBox(
  hWnd: THandle;   // HWND optional
  pszDistUnit: PWideChar;   // LPCWSTR
  dwFlags: DWORD;   // DWORD
  psdi: Pointer   // SOFTDISTINFO* optional, out
): DWORD; stdcall;
  external 'SHDOCVW.dll' name 'SoftwareUpdateMessageBox';

result := DllCall("SHDOCVW\SoftwareUpdateMessageBox"
    , "Ptr", hWnd   ; HWND optional
    , "WStr", pszDistUnit   ; LPCWSTR
    , "UInt", dwFlags   ; DWORD
    , "Ptr", psdi   ; SOFTDISTINFO* optional, out
    , "UInt")   ; return: DWORD

●SoftwareUpdateMessageBox(hWnd, pszDistUnit, dwFlags, psdi) = DLL("SHDOCVW.dll", "dword SoftwareUpdateMessageBox(void*, char*, dword, void*)")
# 呼び出し: SoftwareUpdateMessageBox(hWnd, pszDistUnit, dwFlags, psdi)
# hWnd : HWND optional -> "void*"
# pszDistUnit : LPCWSTR -> "char*"
# dwFlags : DWORD -> "dword"
# psdi : SOFTDISTINFO* optional, out -> "void*"
# 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)。