MsiQueryFeatureStateExW

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

DWORD MsiQueryFeatureStateExW(
    LPCWSTR szProductCode,
    LPCWSTR szUserSid,   // optional
    MSIINSTALLCONTEXT dwContext,
    LPCWSTR szFeature,
    INSTALLSTATE* pdwState   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiQueryFeatureStateExW(
    <MarshalAs(UnmanagedType.LPWStr)> szProductCode As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szUserSid As String,   ' LPCWSTR optional
    dwContext As Integer,   ' MSIINSTALLCONTEXT
    <MarshalAs(UnmanagedType.LPWStr)> szFeature As String,   ' LPCWSTR
    pdwState As IntPtr   ' INSTALLSTATE* optional, out
) As UInteger
End Function

' szProductCode : LPCWSTR
' szUserSid : LPCWSTR optional
' dwContext : MSIINSTALLCONTEXT
' szFeature : LPCWSTR
' pdwState : INSTALLSTATE* optional, out
Declare PtrSafe Function MsiQueryFeatureStateExW Lib "msi" ( _
    ByVal szProductCode As LongPtr, _
    ByVal szUserSid As LongPtr, _
    ByVal dwContext As Long, _
    ByVal szFeature As LongPtr, _
    ByVal pdwState 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

MsiQueryFeatureStateExW = ctypes.windll.msi.MsiQueryFeatureStateExW
MsiQueryFeatureStateExW.restype = wintypes.DWORD
MsiQueryFeatureStateExW.argtypes = [
    wintypes.LPCWSTR,  # szProductCode : LPCWSTR
    wintypes.LPCWSTR,  # szUserSid : LPCWSTR optional
    ctypes.c_int,  # dwContext : MSIINSTALLCONTEXT
    wintypes.LPCWSTR,  # szFeature : LPCWSTR
    ctypes.c_void_p,  # pdwState : INSTALLSTATE* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiQueryFeatureStateExW = Fiddle::Function.new(
  lib['MsiQueryFeatureStateExW'],
  [
    Fiddle::TYPE_VOIDP,  # szProductCode : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szUserSid : LPCWSTR optional
    Fiddle::TYPE_INT,  # dwContext : MSIINSTALLCONTEXT
    Fiddle::TYPE_VOIDP,  # szFeature : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pdwState : INSTALLSTATE* optional, out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiQueryFeatureStateExW(
        szProductCode: *const u16,  // LPCWSTR
        szUserSid: *const u16,  // LPCWSTR optional
        dwContext: i32,  // MSIINSTALLCONTEXT
        szFeature: *const u16,  // LPCWSTR
        pdwState: *mut i32  // INSTALLSTATE* optional, out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiQueryFeatureStateExW([MarshalAs(UnmanagedType.LPWStr)] string szProductCode, [MarshalAs(UnmanagedType.LPWStr)] string szUserSid, int dwContext, [MarshalAs(UnmanagedType.LPWStr)] string szFeature, IntPtr pdwState);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiQueryFeatureStateExW' -Namespace Win32 -PassThru
# $api::MsiQueryFeatureStateExW(szProductCode, szUserSid, dwContext, szFeature, pdwState)

#uselib "msi.dll"
#func global MsiQueryFeatureStateExW "MsiQueryFeatureStateExW" wptr, wptr, wptr, wptr, wptr
; MsiQueryFeatureStateExW szProductCode, szUserSid, dwContext, szFeature, pdwState   ; 戻り値は stat
; szProductCode : LPCWSTR -> "wptr"
; szUserSid : LPCWSTR optional -> "wptr"
; dwContext : MSIINSTALLCONTEXT -> "wptr"
; szFeature : LPCWSTR -> "wptr"
; pdwState : INSTALLSTATE* 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 MsiQueryFeatureStateExW "MsiQueryFeatureStateExW" wstr, wstr, int, wstr, int
; res = MsiQueryFeatureStateExW(szProductCode, szUserSid, dwContext, szFeature, pdwState)
; szProductCode : LPCWSTR -> "wstr"
; szUserSid : LPCWSTR optional -> "wstr"
; dwContext : MSIINSTALLCONTEXT -> "int"
; szFeature : LPCWSTR -> "wstr"
; pdwState : INSTALLSTATE* optional, out -> "int"

; DWORD MsiQueryFeatureStateExW(LPCWSTR szProductCode, LPCWSTR szUserSid, MSIINSTALLCONTEXT dwContext, LPCWSTR szFeature, INSTALLSTATE* pdwState)
#uselib "msi.dll"
#cfunc global MsiQueryFeatureStateExW "MsiQueryFeatureStateExW" wstr, wstr, int, wstr, int
; res = MsiQueryFeatureStateExW(szProductCode, szUserSid, dwContext, szFeature, pdwState)
; szProductCode : LPCWSTR -> "wstr"
; szUserSid : LPCWSTR optional -> "wstr"
; dwContext : MSIINSTALLCONTEXT -> "int"
; szFeature : LPCWSTR -> "wstr"
; pdwState : INSTALLSTATE* optional, out -> "int"

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiQueryFeatureStateExW = msi.NewProc("MsiQueryFeatureStateExW")
)

// szProductCode (LPCWSTR), szUserSid (LPCWSTR optional), dwContext (MSIINSTALLCONTEXT), szFeature (LPCWSTR), pdwState (INSTALLSTATE* optional, out)
r1, _, err := procMsiQueryFeatureStateExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szProductCode))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szUserSid))),
	uintptr(dwContext),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szFeature))),
	uintptr(pdwState),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiQueryFeatureStateExW(
  szProductCode: PWideChar;   // LPCWSTR
  szUserSid: PWideChar;   // LPCWSTR optional
  dwContext: Integer;   // MSIINSTALLCONTEXT
  szFeature: PWideChar;   // LPCWSTR
  pdwState: Pointer   // INSTALLSTATE* optional, out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiQueryFeatureStateExW';

result := DllCall("msi\MsiQueryFeatureStateExW"
    , "WStr", szProductCode   ; LPCWSTR
    , "WStr", szUserSid   ; LPCWSTR optional
    , "Int", dwContext   ; MSIINSTALLCONTEXT
    , "WStr", szFeature   ; LPCWSTR
    , "Ptr", pdwState   ; INSTALLSTATE* optional, out
    , "UInt")   ; return: DWORD

●MsiQueryFeatureStateExW(szProductCode, szUserSid, dwContext, szFeature, pdwState) = DLL("msi.dll", "dword MsiQueryFeatureStateExW(char*, char*, int, char*, void*)")
# 呼び出し: MsiQueryFeatureStateExW(szProductCode, szUserSid, dwContext, szFeature, pdwState)
# szProductCode : LPCWSTR -> "char*"
# szUserSid : LPCWSTR optional -> "char*"
# dwContext : MSIINSTALLCONTEXT -> "int"
# szFeature : LPCWSTR -> "char*"
# pdwState : INSTALLSTATE* 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。