MsiGetFeatureInfoA

// msi.dll  (ANSI / -A)
#include <windows.h>

DWORD MsiGetFeatureInfoA(
    MSIHANDLE hProduct,
    LPCSTR szFeature,
    DWORD* lpAttributes,   // optional
    LPSTR lpTitleBuf,   // optional
    DWORD* pcchTitleBuf,   // optional
    LPSTR lpHelpBuf,   // optional
    DWORD* pcchHelpBuf   // optional
);

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

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

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetFeatureInfoA = Fiddle::Function.new(
  lib['MsiGetFeatureInfoA'],
  [
    -Fiddle::TYPE_INT,  # hProduct : MSIHANDLE
    Fiddle::TYPE_VOIDP,  # szFeature : LPCSTR
    Fiddle::TYPE_VOIDP,  # lpAttributes : DWORD* optional, out
    Fiddle::TYPE_VOIDP,  # lpTitleBuf : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchTitleBuf : DWORD* optional, in/out
    Fiddle::TYPE_VOIDP,  # lpHelpBuf : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchHelpBuf : DWORD* optional, in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiGetFeatureInfoA(
        hProduct: u32,  // MSIHANDLE
        szFeature: *const u8,  // LPCSTR
        lpAttributes: *mut u32,  // DWORD* optional, out
        lpTitleBuf: *mut u8,  // LPSTR optional, out
        pcchTitleBuf: *mut u32,  // DWORD* optional, in/out
        lpHelpBuf: *mut u8,  // LPSTR 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.Ansi)]
public static extern uint MsiGetFeatureInfoA(uint hProduct, [MarshalAs(UnmanagedType.LPStr)] string szFeature, IntPtr lpAttributes, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpTitleBuf, IntPtr pcchTitleBuf, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpHelpBuf, IntPtr pcchHelpBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetFeatureInfoA' -Namespace Win32 -PassThru
# $api::MsiGetFeatureInfoA(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf)

#uselib "msi.dll"
#func global MsiGetFeatureInfoA "MsiGetFeatureInfoA" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; MsiGetFeatureInfoA hProduct, szFeature, varptr(lpAttributes), varptr(lpTitleBuf), varptr(pcchTitleBuf), varptr(lpHelpBuf), varptr(pcchHelpBuf)   ; 戻り値は stat
; hProduct : MSIHANDLE -> "sptr"
; szFeature : LPCSTR -> "sptr"
; lpAttributes : DWORD* optional, out -> "sptr"
; lpTitleBuf : LPSTR optional, out -> "sptr"
; pcchTitleBuf : DWORD* optional, in/out -> "sptr"
; lpHelpBuf : LPSTR optional, out -> "sptr"
; pcchHelpBuf : DWORD* optional, in/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 "msi.dll"
#cfunc global MsiGetFeatureInfoA "MsiGetFeatureInfoA" int, str, var, var, var, var, var
; res = MsiGetFeatureInfoA(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf)
; hProduct : MSIHANDLE -> "int"
; szFeature : LPCSTR -> "str"
; lpAttributes : DWORD* optional, out -> "var"
; lpTitleBuf : LPSTR optional, out -> "var"
; pcchTitleBuf : DWORD* optional, in/out -> "var"
; lpHelpBuf : LPSTR 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 MsiGetFeatureInfoA(MSIHANDLE hProduct, LPCSTR szFeature, DWORD* lpAttributes, LPSTR lpTitleBuf, DWORD* pcchTitleBuf, LPSTR lpHelpBuf, DWORD* pcchHelpBuf)
#uselib "msi.dll"
#cfunc global MsiGetFeatureInfoA "MsiGetFeatureInfoA" int, str, var, var, var, var, var
; res = MsiGetFeatureInfoA(hProduct, szFeature, lpAttributes, lpTitleBuf, pcchTitleBuf, lpHelpBuf, pcchHelpBuf)
; hProduct : MSIHANDLE -> "int"
; szFeature : LPCSTR -> "str"
; lpAttributes : DWORD* optional, out -> "var"
; lpTitleBuf : LPSTR optional, out -> "var"
; pcchTitleBuf : DWORD* optional, in/out -> "var"
; lpHelpBuf : LPSTR 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")
	procMsiGetFeatureInfoA = msi.NewProc("MsiGetFeatureInfoA")
)

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

function MsiGetFeatureInfoA(
  hProduct: DWORD;   // MSIHANDLE
  szFeature: PAnsiChar;   // LPCSTR
  lpAttributes: Pointer;   // DWORD* optional, out
  lpTitleBuf: PAnsiChar;   // LPSTR optional, out
  pcchTitleBuf: Pointer;   // DWORD* optional, in/out
  lpHelpBuf: PAnsiChar;   // LPSTR optional, out
  pcchHelpBuf: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetFeatureInfoA';

result := DllCall("msi\MsiGetFeatureInfoA"
    , "UInt", hProduct   ; MSIHANDLE
    , "AStr", szFeature   ; LPCSTR
    , "Ptr", lpAttributes   ; DWORD* optional, out
    , "Ptr", lpTitleBuf   ; LPSTR optional, out
    , "Ptr", pcchTitleBuf   ; DWORD* optional, in/out
    , "Ptr", lpHelpBuf   ; LPSTR optional, out
    , "Ptr", pcchHelpBuf   ; DWORD* optional, in/out
    , "UInt")   ; return: DWORD

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