MsiGetFeatureInfoW

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

DWORD MsiGetFeatureInfoW(
    MSIHANDLE hProduct,
    LPCWSTR szFeature,
    DWORD* lpAttributes,   // optional
    LPWSTR lpTitleBuf,   // optional
    DWORD* pcchTitleBuf,   // optional
    LPWSTR lpHelpBuf,   // optional
    DWORD* pcchHelpBuf   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiGetFeatureInfoW(
    hProduct As UInteger,   ' MSIHANDLE
    <MarshalAs(UnmanagedType.LPWStr)> szFeature As String,   ' LPCWSTR
    lpAttributes As IntPtr,   ' DWORD* optional, out
    <MarshalAs(UnmanagedType.LPWStr)> lpTitleBuf As System.Text.StringBuilder,   ' LPWSTR optional, out
    pcchTitleBuf As IntPtr,   ' DWORD* optional, in/out
    <MarshalAs(UnmanagedType.LPWStr)> lpHelpBuf As System.Text.StringBuilder,   ' LPWSTR optional, out
    pcchHelpBuf As IntPtr   ' DWORD* optional, in/out
) As UInteger
End Function

' hProduct : MSIHANDLE
' szFeature : LPCWSTR
' lpAttributes : DWORD* optional, out
' lpTitleBuf : LPWSTR optional, out
' pcchTitleBuf : DWORD* optional, in/out
' lpHelpBuf : LPWSTR optional, out
' pcchHelpBuf : DWORD* optional, in/out
Declare PtrSafe Function MsiGetFeatureInfoW Lib "msi" ( _
    ByVal hProduct As Long, _
    ByVal szFeature As LongPtr, _
    ByVal lpAttributes As LongPtr, _
    ByVal lpTitleBuf As LongPtr, _
    ByVal pcchTitleBuf As LongPtr, _
    ByVal lpHelpBuf As LongPtr, _
    ByVal pcchHelpBuf 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

MsiGetFeatureInfoW = ctypes.windll.msi.MsiGetFeatureInfoW
MsiGetFeatureInfoW.restype = wintypes.DWORD
MsiGetFeatureInfoW.argtypes = [
    wintypes.DWORD,  # hProduct : MSIHANDLE
    wintypes.LPCWSTR,  # szFeature : LPCWSTR
    ctypes.POINTER(wintypes.DWORD),  # lpAttributes : DWORD* optional, out
    wintypes.LPWSTR,  # lpTitleBuf : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchTitleBuf : DWORD* optional, in/out
    wintypes.LPWSTR,  # lpHelpBuf : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchHelpBuf : DWORD* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetFeatureInfoW = Fiddle::Function.new(
  lib['MsiGetFeatureInfoW'],
  [
    -Fiddle::TYPE_INT,  # hProduct : MSIHANDLE
    Fiddle::TYPE_VOIDP,  # szFeature : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpAttributes : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # lpTitleBuf : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchTitleBuf : DWORD* optional, in/out
    Fiddle::TYPE_VOIDP,  # lpHelpBuf : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchHelpBuf : DWORD* optional, in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiGetFeatureInfoW(
        hProduct: u32,  // MSIHANDLE
        szFeature: *const u16,  // LPCWSTR
        lpAttributes: *mut u32,  // DWORD* optional, out
        lpTitleBuf: *mut u16,  // LPWSTR optional, out
        pcchTitleBuf: *mut u32,  // DWORD* optional, in/out
        lpHelpBuf: *mut u16,  // LPWSTR optional, out
        pcchHelpBuf: *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 MsiGetFeatureInfoW(uint hProduct, [MarshalAs(UnmanagedType.LPWStr)] string szFeature, IntPtr lpAttributes, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpTitleBuf, IntPtr pcchTitleBuf, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpHelpBuf, IntPtr pcchHelpBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetFeatureInfoW' -Namespace Win32 -PassThru
# $api::MsiGetFeatureInfoW(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf)

#uselib "msi.dll"
#func global MsiGetFeatureInfoW "MsiGetFeatureInfoW" wptr, wptr, wptr, wptr, wptr, wptr, wptr
; MsiGetFeatureInfoW hProduct, szFeature, varptr(lpAttributes), varptr(lpTitleBuf), varptr(pcchTitleBuf), varptr(lpHelpBuf), varptr(pcchHelpBuf)   ; 戻り値は stat
; hProduct : MSIHANDLE -> "wptr"
; szFeature : LPCWSTR -> "wptr"
; lpAttributes : DWORD* optional, out -> "wptr"
; lpTitleBuf : LPWSTR optional, out -> "wptr"
; pcchTitleBuf : DWORD* optional, in/out -> "wptr"
; lpHelpBuf : LPWSTR optional, out -> "wptr"
; pcchHelpBuf : 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。

#uselib "msi.dll"
#cfunc global MsiGetFeatureInfoW "MsiGetFeatureInfoW" int, wstr, var, var, var, var, var
; res = MsiGetFeatureInfoW(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf)
; hProduct : MSIHANDLE -> "int"
; szFeature : LPCWSTR -> "wstr"
; lpAttributes : DWORD* optional, out -> "var"
; lpTitleBuf : LPWSTR optional, out -> "var"
; pcchTitleBuf : DWORD* optional, in/out -> "var"
; lpHelpBuf : LPWSTR optional, out -> "var"
; pcchHelpBuf : DWORD* optional, in/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 MsiGetFeatureInfoW(MSIHANDLE hProduct, LPCWSTR szFeature, DWORD* lpAttributes, LPWSTR lpTitleBuf, DWORD* pcchTitleBuf, LPWSTR lpHelpBuf, DWORD* pcchHelpBuf)
#uselib "msi.dll"
#cfunc global MsiGetFeatureInfoW "MsiGetFeatureInfoW" int, wstr, var, var, var, var, var
; res = MsiGetFeatureInfoW(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf)
; hProduct : MSIHANDLE -> "int"
; szFeature : LPCWSTR -> "wstr"
; lpAttributes : DWORD* optional, out -> "var"
; lpTitleBuf : LPWSTR optional, out -> "var"
; pcchTitleBuf : DWORD* optional, in/out -> "var"
; lpHelpBuf : LPWSTR optional, out -> "var"
; pcchHelpBuf : DWORD* optional, in/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")
	procMsiGetFeatureInfoW = msi.NewProc("MsiGetFeatureInfoW")
)

// hProduct (MSIHANDLE), szFeature (LPCWSTR), lpAttributes (DWORD* optional, out), lpTitleBuf (LPWSTR optional, out), pcchTitleBuf (DWORD* optional, in/out), lpHelpBuf (LPWSTR optional, out), pcchHelpBuf (DWORD* optional, in/out)
r1, _, err := procMsiGetFeatureInfoW.Call(
	uintptr(hProduct),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szFeature))),
	uintptr(lpAttributes),
	uintptr(lpTitleBuf),
	uintptr(pcchTitleBuf),
	uintptr(lpHelpBuf),
	uintptr(pcchHelpBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiGetFeatureInfoW(
  hProduct: DWORD;   // MSIHANDLE
  szFeature: PWideChar;   // LPCWSTR
  lpAttributes: Pointer;   // DWORD* optional, out
  lpTitleBuf: PWideChar;   // LPWSTR optional, out
  pcchTitleBuf: Pointer;   // DWORD* optional, in/out
  lpHelpBuf: PWideChar;   // LPWSTR optional, out
  pcchHelpBuf: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetFeatureInfoW';

result := DllCall("msi\MsiGetFeatureInfoW"
    , "UInt", hProduct   ; MSIHANDLE
    , "WStr", szFeature   ; LPCWSTR
    , "Ptr", lpAttributes   ; DWORD* optional, out
    , "Ptr", lpTitleBuf   ; LPWSTR optional, out
    , "Ptr", pcchTitleBuf   ; DWORD* optional, in/out
    , "Ptr", lpHelpBuf   ; LPWSTR optional, out
    , "Ptr", pcchHelpBuf   ; DWORD* optional, in/out
    , "UInt")   ; return: DWORD

●MsiGetFeatureInfoW(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf) = DLL("msi.dll", "dword MsiGetFeatureInfoW(dword, char*, void*, char*, void*, char*, void*)")
# 呼び出し: MsiGetFeatureInfoW(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf)
# hProduct : MSIHANDLE -> "dword"
# szFeature : LPCWSTR -> "char*"
# lpAttributes : DWORD* optional, out -> "void*"
# lpTitleBuf : LPWSTR optional, out -> "char*"
# pcchTitleBuf : DWORD* optional, in/out -> "void*"
# lpHelpBuf : LPWSTR optional, out -> "char*"
# pcchHelpBuf : 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。