GetSoftwareUpdateInfo

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

HRESULT GetSoftwareUpdateInfo(
    LPCWSTR szDistUnit,
    SOFTDISTINFO* psdi
);

<DllImport("urlmon.dll", ExactSpelling:=True)>
Public Shared Function GetSoftwareUpdateInfo(
    <MarshalAs(UnmanagedType.LPWStr)> szDistUnit As String,   ' LPCWSTR
    psdi As IntPtr   ' SOFTDISTINFO* out
) As Integer
End Function

' szDistUnit : LPCWSTR
' psdi : SOFTDISTINFO* out
Declare PtrSafe Function GetSoftwareUpdateInfo Lib "urlmon" ( _
    ByVal szDistUnit As LongPtr, _
    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

GetSoftwareUpdateInfo = ctypes.windll.urlmon.GetSoftwareUpdateInfo
GetSoftwareUpdateInfo.restype = ctypes.c_int
GetSoftwareUpdateInfo.argtypes = [
    wintypes.LPCWSTR,  # szDistUnit : LPCWSTR
    ctypes.c_void_p,  # psdi : SOFTDISTINFO* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('urlmon.dll')
GetSoftwareUpdateInfo = Fiddle::Function.new(
  lib['GetSoftwareUpdateInfo'],
  [
    Fiddle::TYPE_VOIDP,  # szDistUnit : LPCWSTR
    Fiddle::TYPE_VOIDP,  # psdi : SOFTDISTINFO* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "urlmon")]
extern "system" {
    fn GetSoftwareUpdateInfo(
        szDistUnit: *const u16,  // LPCWSTR
        psdi: *mut SOFTDISTINFO  // SOFTDISTINFO* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("urlmon.dll")]
public static extern int GetSoftwareUpdateInfo([MarshalAs(UnmanagedType.LPWStr)] string szDistUnit, IntPtr psdi);
"@
$api = Add-Type -MemberDefinition $sig -Name 'urlmon_GetSoftwareUpdateInfo' -Namespace Win32 -PassThru
# $api::GetSoftwareUpdateInfo(szDistUnit, psdi)

#uselib "urlmon.dll"
#func global GetSoftwareUpdateInfo "GetSoftwareUpdateInfo" sptr, sptr
; GetSoftwareUpdateInfo szDistUnit, varptr(psdi)   ; 戻り値は stat
; szDistUnit : LPCWSTR -> "sptr"
; psdi : SOFTDISTINFO* 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 "urlmon.dll"
#cfunc global GetSoftwareUpdateInfo "GetSoftwareUpdateInfo" wstr, var
; res = GetSoftwareUpdateInfo(szDistUnit, psdi)
; szDistUnit : LPCWSTR -> "wstr"
; psdi : SOFTDISTINFO* 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。

; HRESULT GetSoftwareUpdateInfo(LPCWSTR szDistUnit, SOFTDISTINFO* psdi)
#uselib "urlmon.dll"
#cfunc global GetSoftwareUpdateInfo "GetSoftwareUpdateInfo" wstr, var
; res = GetSoftwareUpdateInfo(szDistUnit, psdi)
; szDistUnit : LPCWSTR -> "wstr"
; psdi : SOFTDISTINFO* 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 (
	urlmon = windows.NewLazySystemDLL("urlmon.dll")
	procGetSoftwareUpdateInfo = urlmon.NewProc("GetSoftwareUpdateInfo")
)

// szDistUnit (LPCWSTR), psdi (SOFTDISTINFO* out)
r1, _, err := procGetSoftwareUpdateInfo.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szDistUnit))),
	uintptr(psdi),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetSoftwareUpdateInfo(
  szDistUnit: PWideChar;   // LPCWSTR
  psdi: Pointer   // SOFTDISTINFO* out
): Integer; stdcall;
  external 'urlmon.dll' name 'GetSoftwareUpdateInfo';

result := DllCall("urlmon\GetSoftwareUpdateInfo"
    , "WStr", szDistUnit   ; LPCWSTR
    , "Ptr", psdi   ; SOFTDISTINFO* out
    , "Int")   ; return: HRESULT

●GetSoftwareUpdateInfo(szDistUnit, psdi) = DLL("urlmon.dll", "int GetSoftwareUpdateInfo(char*, void*)")
# 呼び出し: GetSoftwareUpdateInfo(szDistUnit, psdi)
# szDistUnit : LPCWSTR -> "char*"
# psdi : SOFTDISTINFO* 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)。