MsiEnumClientsExW

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

DWORD MsiEnumClientsExW(
    LPCWSTR szComponent,
    LPCWSTR szUserSid,   // optional
    DWORD dwContext,
    DWORD dwProductIndex,
    LPWSTR szProductBuf,   // optional
    MSIINSTALLCONTEXT* pdwInstalledContext,   // optional
    LPWSTR szSid,   // optional
    DWORD* pcchSid   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiEnumClientsExW(
    <MarshalAs(UnmanagedType.LPWStr)> szComponent As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szUserSid As String,   ' LPCWSTR optional
    dwContext As UInteger,   ' DWORD
    dwProductIndex As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> szProductBuf As System.Text.StringBuilder,   ' LPWSTR optional, out
    pdwInstalledContext As IntPtr,   ' MSIINSTALLCONTEXT* optional, out
    <MarshalAs(UnmanagedType.LPWStr)> szSid As System.Text.StringBuilder,   ' LPWSTR optional, out
    pcchSid As IntPtr   ' DWORD* optional, in/out
) As UInteger
End Function

' szComponent : LPCWSTR
' szUserSid : LPCWSTR optional
' dwContext : DWORD
' dwProductIndex : DWORD
' szProductBuf : LPWSTR optional, out
' pdwInstalledContext : MSIINSTALLCONTEXT* optional, out
' szSid : LPWSTR optional, out
' pcchSid : DWORD* optional, in/out
Declare PtrSafe Function MsiEnumClientsExW Lib "msi" ( _
    ByVal szComponent As LongPtr, _
    ByVal szUserSid As LongPtr, _
    ByVal dwContext As Long, _
    ByVal dwProductIndex As Long, _
    ByVal szProductBuf As LongPtr, _
    ByVal pdwInstalledContext As LongPtr, _
    ByVal szSid As LongPtr, _
    ByVal pcchSid 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

MsiEnumClientsExW = ctypes.windll.msi.MsiEnumClientsExW
MsiEnumClientsExW.restype = wintypes.DWORD
MsiEnumClientsExW.argtypes = [
    wintypes.LPCWSTR,  # szComponent : LPCWSTR
    wintypes.LPCWSTR,  # szUserSid : LPCWSTR optional
    wintypes.DWORD,  # dwContext : DWORD
    wintypes.DWORD,  # dwProductIndex : DWORD
    wintypes.LPWSTR,  # szProductBuf : LPWSTR optional, out
    ctypes.c_void_p,  # pdwInstalledContext : MSIINSTALLCONTEXT* optional, out
    wintypes.LPWSTR,  # szSid : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchSid : DWORD* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiEnumClientsExW = Fiddle::Function.new(
  lib['MsiEnumClientsExW'],
  [
    Fiddle::TYPE_VOIDP,  # szComponent : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szUserSid : LPCWSTR optional
    -Fiddle::TYPE_INT,  # dwContext : DWORD
    -Fiddle::TYPE_INT,  # dwProductIndex : DWORD
    Fiddle::TYPE_VOIDP,  # szProductBuf : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pdwInstalledContext : MSIINSTALLCONTEXT* optional, out
    Fiddle::TYPE_VOIDP,  # szSid : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchSid : DWORD* optional, in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiEnumClientsExW(
        szComponent: *const u16,  // LPCWSTR
        szUserSid: *const u16,  // LPCWSTR optional
        dwContext: u32,  // DWORD
        dwProductIndex: u32,  // DWORD
        szProductBuf: *mut u16,  // LPWSTR optional, out
        pdwInstalledContext: *mut i32,  // MSIINSTALLCONTEXT* optional, out
        szSid: *mut u16,  // LPWSTR optional, out
        pcchSid: *mut u32  // DWORD* optional, in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiEnumClientsExW([MarshalAs(UnmanagedType.LPWStr)] string szComponent, [MarshalAs(UnmanagedType.LPWStr)] string szUserSid, uint dwContext, uint dwProductIndex, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szProductBuf, IntPtr pdwInstalledContext, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szSid, IntPtr pcchSid);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiEnumClientsExW' -Namespace Win32 -PassThru
# $api::MsiEnumClientsExW(szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid)

#uselib "msi.dll"
#func global MsiEnumClientsExW "MsiEnumClientsExW" wptr, wptr, wptr, wptr, wptr, wptr, wptr, wptr
; MsiEnumClientsExW szComponent, szUserSid, dwContext, dwProductIndex, varptr(szProductBuf), varptr(pdwInstalledContext), varptr(szSid), varptr(pcchSid)   ; 戻り値は stat
; szComponent : LPCWSTR -> "wptr"
; szUserSid : LPCWSTR optional -> "wptr"
; dwContext : DWORD -> "wptr"
; dwProductIndex : DWORD -> "wptr"
; szProductBuf : LPWSTR optional, out -> "wptr"
; pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> "wptr"
; szSid : LPWSTR optional, out -> "wptr"
; pcchSid : DWORD* optional, in/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。

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiEnumClientsExW = msi.NewProc("MsiEnumClientsExW")
)

// szComponent (LPCWSTR), szUserSid (LPCWSTR optional), dwContext (DWORD), dwProductIndex (DWORD), szProductBuf (LPWSTR optional, out), pdwInstalledContext (MSIINSTALLCONTEXT* optional, out), szSid (LPWSTR optional, out), pcchSid (DWORD* optional, in/out)
r1, _, err := procMsiEnumClientsExW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szComponent))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szUserSid))),
	uintptr(dwContext),
	uintptr(dwProductIndex),
	uintptr(szProductBuf),
	uintptr(pdwInstalledContext),
	uintptr(szSid),
	uintptr(pcchSid),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiEnumClientsExW(
  szComponent: PWideChar;   // LPCWSTR
  szUserSid: PWideChar;   // LPCWSTR optional
  dwContext: DWORD;   // DWORD
  dwProductIndex: DWORD;   // DWORD
  szProductBuf: PWideChar;   // LPWSTR optional, out
  pdwInstalledContext: Pointer;   // MSIINSTALLCONTEXT* optional, out
  szSid: PWideChar;   // LPWSTR optional, out
  pcchSid: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiEnumClientsExW';

result := DllCall("msi\MsiEnumClientsExW"
    , "WStr", szComponent   ; LPCWSTR
    , "WStr", szUserSid   ; LPCWSTR optional
    , "UInt", dwContext   ; DWORD
    , "UInt", dwProductIndex   ; DWORD
    , "Ptr", szProductBuf   ; LPWSTR optional, out
    , "Ptr", pdwInstalledContext   ; MSIINSTALLCONTEXT* optional, out
    , "Ptr", szSid   ; LPWSTR optional, out
    , "Ptr", pcchSid   ; DWORD* optional, in/out
    , "UInt")   ; return: DWORD

●MsiEnumClientsExW(szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid) = DLL("msi.dll", "dword MsiEnumClientsExW(char*, char*, dword, dword, char*, void*, char*, void*)")
# 呼び出し: MsiEnumClientsExW(szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid)
# szComponent : LPCWSTR -> "char*"
# szUserSid : LPCWSTR optional -> "char*"
# dwContext : DWORD -> "dword"
# dwProductIndex : DWORD -> "dword"
# szProductBuf : LPWSTR optional, out -> "char*"
# pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> "void*"
# szSid : LPWSTR optional, out -> "char*"
# pcchSid : DWORD* optional, in/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。

const std = @import("std");

extern "msi" fn MsiEnumClientsExW(
    szComponent: [*c]const u16, // LPCWSTR
    szUserSid: [*c]const u16, // LPCWSTR optional
    dwContext: u32, // DWORD
    dwProductIndex: u32, // DWORD
    szProductBuf: [*c]u16, // LPWSTR optional, out
    pdwInstalledContext: [*c]i32, // MSIINSTALLCONTEXT* optional, out
    szSid: [*c]u16, // LPWSTR optional, out
    pcchSid: [*c]u32 // DWORD* optional, in/out
) callconv(std.os.windows.WINAPI) u32;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc MsiEnumClientsExW(
    szComponent: WideCString,  # LPCWSTR
    szUserSid: WideCString,  # LPCWSTR optional
    dwContext: uint32,  # DWORD
    dwProductIndex: uint32,  # DWORD
    szProductBuf: ptr uint16,  # LPWSTR optional, out
    pdwInstalledContext: ptr int32,  # MSIINSTALLCONTEXT* optional, out
    szSid: ptr uint16,  # LPWSTR optional, out
    pcchSid: ptr uint32  # DWORD* optional, in/out
): uint32 {.importc: "MsiEnumClientsExW", stdcall, dynlib: "msi.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "msi");
extern(Windows)
uint MsiEnumClientsExW(
    const(wchar)* szComponent,   // LPCWSTR
    const(wchar)* szUserSid,   // LPCWSTR optional
    uint dwContext,   // DWORD
    uint dwProductIndex,   // DWORD
    wchar* szProductBuf,   // LPWSTR optional, out
    int* pdwInstalledContext,   // MSIINSTALLCONTEXT* optional, out
    wchar* szSid,   // LPWSTR optional, out
    uint* pcchSid   // DWORD* optional, in/out
);

ccall((:MsiEnumClientsExW, "msi.dll"), stdcall, UInt32,
      (Cwstring, Cwstring, UInt32, UInt32, Ptr{UInt16}, Ptr{Int32}, Ptr{UInt16}, Ptr{UInt32}),
      szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid)
# szComponent : LPCWSTR -> Cwstring
# szUserSid : LPCWSTR optional -> Cwstring
# dwContext : DWORD -> UInt32
# dwProductIndex : DWORD -> UInt32
# szProductBuf : LPWSTR optional, out -> Ptr{UInt16}
# pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> Ptr{Int32}
# szSid : LPWSTR optional, out -> Ptr{UInt16}
# pcchSid : DWORD* optional, in/out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
uint32_t MsiEnumClientsExW(
    const uint16_t* szComponent,
    const uint16_t* szUserSid,
    uint32_t dwContext,
    uint32_t dwProductIndex,
    uint16_t* szProductBuf,
    int32_t* pdwInstalledContext,
    uint16_t* szSid,
    uint32_t* pcchSid);
]]
local msi = ffi.load("msi")
-- msi.MsiEnumClientsExW(szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid)
-- szComponent : LPCWSTR
-- szUserSid : LPCWSTR optional
-- dwContext : DWORD
-- dwProductIndex : DWORD
-- szProductBuf : LPWSTR optional, out
-- pdwInstalledContext : MSIINSTALLCONTEXT* optional, out
-- szSid : LPWSTR optional, out
-- pcchSid : DWORD* optional, in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('msi.dll');
const MsiEnumClientsExW = lib.func('__stdcall', 'MsiEnumClientsExW', 'uint32_t', ['str16', 'str16', 'uint32_t', 'uint32_t', 'uint16_t *', 'int32_t *', 'uint16_t *', 'uint32_t *']);
// MsiEnumClientsExW(szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid)
// szComponent : LPCWSTR -> 'str16'
// szUserSid : LPCWSTR optional -> 'str16'
// dwContext : DWORD -> 'uint32_t'
// dwProductIndex : DWORD -> 'uint32_t'
// szProductBuf : LPWSTR optional, out -> 'uint16_t *'
// pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> 'int32_t *'
// szSid : LPWSTR optional, out -> 'uint16_t *'
// pcchSid : DWORD* optional, in/out -> 'uint32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("msi.dll", {
  MsiEnumClientsExW: { parameters: ["buffer", "buffer", "u32", "u32", "buffer", "pointer", "buffer", "pointer"], result: "u32" },
});
// lib.symbols.MsiEnumClientsExW(szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid)
// szComponent : LPCWSTR -> "buffer"
// szUserSid : LPCWSTR optional -> "buffer"
// dwContext : DWORD -> "u32"
// dwProductIndex : DWORD -> "u32"
// szProductBuf : LPWSTR optional, out -> "buffer"
// pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> "pointer"
// szSid : LPWSTR optional, out -> "buffer"
// pcchSid : DWORD* optional, in/out -> "pointer"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)を Uint8Array で渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
uint32_t MsiEnumClientsExW(
    const uint16_t* szComponent,
    const uint16_t* szUserSid,
    uint32_t dwContext,
    uint32_t dwProductIndex,
    uint16_t* szProductBuf,
    int32_t* pdwInstalledContext,
    uint16_t* szSid,
    uint32_t* pcchSid);
C, "msi.dll");
// $ffi->MsiEnumClientsExW(szComponent, szUserSid, dwContext, dwProductIndex, szProductBuf, pdwInstalledContext, szSid, pcchSid);
// szComponent : LPCWSTR
// szUserSid : LPCWSTR optional
// dwContext : DWORD
// dwProductIndex : DWORD
// szProductBuf : LPWSTR optional, out
// pdwInstalledContext : MSIINSTALLCONTEXT* optional, out
// szSid : LPWSTR optional, out
// pcchSid : DWORD* optional, in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Msi extends StdCallLibrary {
    Msi INSTANCE = Native.load("msi", Msi.class, W32APIOptions.UNICODE_OPTIONS);
    int MsiEnumClientsExW(
        WString szComponent,   // LPCWSTR
        WString szUserSid,   // LPCWSTR optional
        int dwContext,   // DWORD
        int dwProductIndex,   // DWORD
        char[] szProductBuf,   // LPWSTR optional, out
        IntByReference pdwInstalledContext,   // MSIINSTALLCONTEXT* optional, out
        char[] szSid,   // LPWSTR optional, out
        IntByReference pcchSid   // DWORD* optional, in/out
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("msi")]
lib Libmsi
  fun MsiEnumClientsExW = MsiEnumClientsExW(
    szComponent : UInt16*,   # LPCWSTR
    szUserSid : UInt16*,   # LPCWSTR optional
    dwContext : UInt32,   # DWORD
    dwProductIndex : UInt32,   # DWORD
    szProductBuf : UInt16*,   # LPWSTR optional, out
    pdwInstalledContext : Int32*,   # MSIINSTALLCONTEXT* optional, out
    szSid : UInt16*,   # LPWSTR optional, out
    pcchSid : UInt32*   # DWORD* optional, in/out
  ) : UInt32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef MsiEnumClientsExWNative = Uint32 Function(Pointer<Utf16>, Pointer<Utf16>, Uint32, Uint32, Pointer<Utf16>, Pointer<Int32>, Pointer<Utf16>, Pointer<Uint32>);
typedef MsiEnumClientsExWDart = int Function(Pointer<Utf16>, Pointer<Utf16>, int, int, Pointer<Utf16>, Pointer<Int32>, Pointer<Utf16>, Pointer<Uint32>);
final MsiEnumClientsExW = DynamicLibrary.open('msi.dll')
    .lookupFunction<MsiEnumClientsExWNative, MsiEnumClientsExWDart>('MsiEnumClientsExW');
// szComponent : LPCWSTR -> Pointer<Utf16>
// szUserSid : LPCWSTR optional -> Pointer<Utf16>
// dwContext : DWORD -> Uint32
// dwProductIndex : DWORD -> Uint32
// szProductBuf : LPWSTR optional, out -> Pointer<Utf16>
// pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> Pointer<Int32>
// szSid : LPWSTR optional, out -> Pointer<Utf16>
// pcchSid : DWORD* optional, in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function MsiEnumClientsExW(
  szComponent: PWideChar;   // LPCWSTR
  szUserSid: PWideChar;   // LPCWSTR optional
  dwContext: DWORD;   // DWORD
  dwProductIndex: DWORD;   // DWORD
  szProductBuf: PWideChar;   // LPWSTR optional, out
  pdwInstalledContext: Pointer;   // MSIINSTALLCONTEXT* optional, out
  szSid: PWideChar;   // LPWSTR optional, out
  pcchSid: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiEnumClientsExW';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "MsiEnumClientsExW"
  c_MsiEnumClientsExW :: CWString -> CWString -> Word32 -> Word32 -> CWString -> Ptr Int32 -> CWString -> Ptr Word32 -> IO Word32
-- szComponent : LPCWSTR -> CWString
-- szUserSid : LPCWSTR optional -> CWString
-- dwContext : DWORD -> Word32
-- dwProductIndex : DWORD -> Word32
-- szProductBuf : LPWSTR optional, out -> CWString
-- pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> Ptr Int32
-- szSid : LPWSTR optional, out -> CWString
-- pcchSid : DWORD* optional, in/out -> Ptr Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let msienumclientsexw =
  foreign "MsiEnumClientsExW"
    ((ptr uint16_t) @-> (ptr uint16_t) @-> uint32_t @-> uint32_t @-> (ptr uint16_t) @-> (ptr int32_t) @-> (ptr uint16_t) @-> (ptr uint32_t) @-> returning uint32_t)
(* szComponent : LPCWSTR -> (ptr uint16_t) *)
(* szUserSid : LPCWSTR optional -> (ptr uint16_t) *)
(* dwContext : DWORD -> uint32_t *)
(* dwProductIndex : DWORD -> uint32_t *)
(* szProductBuf : LPWSTR optional, out -> (ptr uint16_t) *)
(* pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> (ptr int32_t) *)
(* szSid : LPWSTR optional, out -> (ptr uint16_t) *)
(* pcchSid : DWORD* optional, in/out -> (ptr uint32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library msi (t "msi.dll"))
(cffi:use-foreign-library msi)

(cffi:defcfun ("MsiEnumClientsExW" msi-enum-clients-ex-w :convention :stdcall) :uint32
  (sz-component (:string :encoding :utf-16le))   ; LPCWSTR
  (sz-user-sid (:string :encoding :utf-16le))   ; LPCWSTR optional
  (dw-context :uint32)   ; DWORD
  (dw-product-index :uint32)   ; DWORD
  (sz-product-buf :pointer)   ; LPWSTR optional, out
  (pdw-installed-context :pointer)   ; MSIINSTALLCONTEXT* optional, out
  (sz-sid :pointer)   ; LPWSTR optional, out
  (pcch-sid :pointer))   ; DWORD* optional, in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $MsiEnumClientsExW = Win32::API::More->new('msi',
    'DWORD MsiEnumClientsExW(LPCWSTR szComponent, LPCWSTR szUserSid, DWORD dwContext, DWORD dwProductIndex, LPWSTR szProductBuf, LPVOID pdwInstalledContext, LPWSTR szSid, LPVOID pcchSid)');
# my $ret = $MsiEnumClientsExW->Call($szComponent, $szUserSid, $dwContext, $dwProductIndex, $szProductBuf, $pdwInstalledContext, $szSid, $pcchSid);
# szComponent : LPCWSTR -> LPCWSTR
# szUserSid : LPCWSTR optional -> LPCWSTR
# dwContext : DWORD -> DWORD
# dwProductIndex : DWORD -> DWORD
# szProductBuf : LPWSTR optional, out -> LPWSTR
# pdwInstalledContext : MSIINSTALLCONTEXT* optional, out -> LPVOID
# szSid : LPWSTR optional, out -> LPWSTR
# pcchSid : DWORD* optional, in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。