MsiGetFeatureUsageW

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

DWORD MsiGetFeatureUsageW(
    LPCWSTR szProduct,
    LPCWSTR szFeature,
    DWORD* pdwUseCount,   // optional
    WORD* pwDateUsed   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiGetFeatureUsageW(
    <MarshalAs(UnmanagedType.LPWStr)> szProduct As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szFeature As String,   ' LPCWSTR
    pdwUseCount As IntPtr,   ' DWORD* optional, out
    pwDateUsed As IntPtr   ' WORD* optional, out
) As UInteger
End Function

' szProduct : LPCWSTR
' szFeature : LPCWSTR
' pdwUseCount : DWORD* optional, out
' pwDateUsed : WORD* optional, out
Declare PtrSafe Function MsiGetFeatureUsageW Lib "msi" ( _
    ByVal szProduct As LongPtr, _
    ByVal szFeature As LongPtr, _
    ByVal pdwUseCount As LongPtr, _
    ByVal pwDateUsed As LongPtr) 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

MsiGetFeatureUsageW = ctypes.windll.msi.MsiGetFeatureUsageW
MsiGetFeatureUsageW.restype = wintypes.DWORD
MsiGetFeatureUsageW.argtypes = [
    wintypes.LPCWSTR,  # szProduct : LPCWSTR
    wintypes.LPCWSTR,  # szFeature : LPCWSTR
    ctypes.POINTER(wintypes.DWORD),  # pdwUseCount : DWORD* optional, out
    ctypes.POINTER(ctypes.c_ushort),  # pwDateUsed : WORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetFeatureUsageW = Fiddle::Function.new(
  lib['MsiGetFeatureUsageW'],
  [
    Fiddle::TYPE_VOIDP,  # szProduct : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szFeature : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pdwUseCount : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # pwDateUsed : WORD* optional, out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiGetFeatureUsageW(
        szProduct: *const u16,  // LPCWSTR
        szFeature: *const u16,  // LPCWSTR
        pdwUseCount: *mut u32,  // DWORD* optional, out
        pwDateUsed: *mut u16  // WORD* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiGetFeatureUsageW([MarshalAs(UnmanagedType.LPWStr)] string szProduct, [MarshalAs(UnmanagedType.LPWStr)] string szFeature, IntPtr pdwUseCount, IntPtr pwDateUsed);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetFeatureUsageW' -Namespace Win32 -PassThru
# $api::MsiGetFeatureUsageW(szProduct, szFeature, pdwUseCount, pwDateUsed)

#uselib "msi.dll"
#func global MsiGetFeatureUsageW "MsiGetFeatureUsageW" wptr, wptr, wptr, wptr
; MsiGetFeatureUsageW szProduct, szFeature, varptr(pdwUseCount), varptr(pwDateUsed)   ; 戻り値は stat
; szProduct : LPCWSTR -> "wptr"
; szFeature : LPCWSTR -> "wptr"
; pdwUseCount : DWORD* optional, out -> "wptr"
; pwDateUsed : WORD* optional, out -> "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 "msi.dll"
#cfunc global MsiGetFeatureUsageW "MsiGetFeatureUsageW" wstr, wstr, var, var
; res = MsiGetFeatureUsageW(szProduct, szFeature, pdwUseCount, pwDateUsed)
; szProduct : LPCWSTR -> "wstr"
; szFeature : LPCWSTR -> "wstr"
; pdwUseCount : DWORD* optional, out -> "var"
; pwDateUsed : WORD* 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 MsiGetFeatureUsageW(LPCWSTR szProduct, LPCWSTR szFeature, DWORD* pdwUseCount, WORD* pwDateUsed)
#uselib "msi.dll"
#cfunc global MsiGetFeatureUsageW "MsiGetFeatureUsageW" wstr, wstr, var, var
; res = MsiGetFeatureUsageW(szProduct, szFeature, pdwUseCount, pwDateUsed)
; szProduct : LPCWSTR -> "wstr"
; szFeature : LPCWSTR -> "wstr"
; pdwUseCount : DWORD* optional, out -> "var"
; pwDateUsed : WORD* 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 (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiGetFeatureUsageW = msi.NewProc("MsiGetFeatureUsageW")
)

// szProduct (LPCWSTR), szFeature (LPCWSTR), pdwUseCount (DWORD* optional, out), pwDateUsed (WORD* optional, out)
r1, _, err := procMsiGetFeatureUsageW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szProduct))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szFeature))),
	uintptr(pdwUseCount),
	uintptr(pwDateUsed),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiGetFeatureUsageW(
  szProduct: PWideChar;   // LPCWSTR
  szFeature: PWideChar;   // LPCWSTR
  pdwUseCount: Pointer;   // DWORD* optional, out
  pwDateUsed: Pointer   // WORD* optional, out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetFeatureUsageW';

result := DllCall("msi\MsiGetFeatureUsageW"
    , "WStr", szProduct   ; LPCWSTR
    , "WStr", szFeature   ; LPCWSTR
    , "Ptr", pdwUseCount   ; DWORD* optional, out
    , "Ptr", pwDateUsed   ; WORD* optional, out
    , "UInt")   ; return: DWORD

●MsiGetFeatureUsageW(szProduct, szFeature, pdwUseCount, pwDateUsed) = DLL("msi.dll", "dword MsiGetFeatureUsageW(char*, char*, void*, void*)")
# 呼び出し: MsiGetFeatureUsageW(szProduct, szFeature, pdwUseCount, pwDateUsed)
# szProduct : LPCWSTR -> "char*"
# szFeature : LPCWSTR -> "char*"
# pdwUseCount : DWORD* optional, out -> "void*"
# pwDateUsed : WORD* 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。