MsiGetFeatureValidStatesW

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

DWORD MsiGetFeatureValidStatesW(
    MSIHANDLE hInstall,
    LPCWSTR szFeature,
    DWORD* lpInstallStates
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiGetFeatureValidStatesW(
    hInstall As UInteger,   ' MSIHANDLE
    <MarshalAs(UnmanagedType.LPWStr)> szFeature As String,   ' LPCWSTR
    ByRef lpInstallStates As UInteger   ' DWORD* in/out
) As UInteger
End Function

' hInstall : MSIHANDLE
' szFeature : LPCWSTR
' lpInstallStates : DWORD* in/out
Declare PtrSafe Function MsiGetFeatureValidStatesW Lib "msi" ( _
    ByVal hInstall As Long, _
    ByVal szFeature As LongPtr, _
    ByRef lpInstallStates As Long) 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

MsiGetFeatureValidStatesW = ctypes.windll.msi.MsiGetFeatureValidStatesW
MsiGetFeatureValidStatesW.restype = wintypes.DWORD
MsiGetFeatureValidStatesW.argtypes = [
    wintypes.DWORD,  # hInstall : MSIHANDLE
    wintypes.LPCWSTR,  # szFeature : LPCWSTR
    ctypes.POINTER(wintypes.DWORD),  # lpInstallStates : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetFeatureValidStatesW = Fiddle::Function.new(
  lib['MsiGetFeatureValidStatesW'],
  [
    -Fiddle::TYPE_INT,  # hInstall : MSIHANDLE
    Fiddle::TYPE_VOIDP,  # szFeature : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpInstallStates : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiGetFeatureValidStatesW(
        hInstall: u32,  // MSIHANDLE
        szFeature: *const u16,  // LPCWSTR
        lpInstallStates: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiGetFeatureValidStatesW(uint hInstall, [MarshalAs(UnmanagedType.LPWStr)] string szFeature, ref uint lpInstallStates);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetFeatureValidStatesW' -Namespace Win32 -PassThru
# $api::MsiGetFeatureValidStatesW(hInstall, szFeature, lpInstallStates)

#uselib "msi.dll"
#func global MsiGetFeatureValidStatesW "MsiGetFeatureValidStatesW" wptr, wptr, wptr
; MsiGetFeatureValidStatesW hInstall, szFeature, varptr(lpInstallStates)   ; 戻り値は stat
; hInstall : MSIHANDLE -> "wptr"
; szFeature : LPCWSTR -> "wptr"
; lpInstallStates : DWORD* 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 MsiGetFeatureValidStatesW "MsiGetFeatureValidStatesW" int, wstr, var
; res = MsiGetFeatureValidStatesW(hInstall, szFeature, lpInstallStates)
; hInstall : MSIHANDLE -> "int"
; szFeature : LPCWSTR -> "wstr"
; lpInstallStates : DWORD* 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 MsiGetFeatureValidStatesW(MSIHANDLE hInstall, LPCWSTR szFeature, DWORD* lpInstallStates)
#uselib "msi.dll"
#cfunc global MsiGetFeatureValidStatesW "MsiGetFeatureValidStatesW" int, wstr, var
; res = MsiGetFeatureValidStatesW(hInstall, szFeature, lpInstallStates)
; hInstall : MSIHANDLE -> "int"
; szFeature : LPCWSTR -> "wstr"
; lpInstallStates : DWORD* 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")
	procMsiGetFeatureValidStatesW = msi.NewProc("MsiGetFeatureValidStatesW")
)

// hInstall (MSIHANDLE), szFeature (LPCWSTR), lpInstallStates (DWORD* in/out)
r1, _, err := procMsiGetFeatureValidStatesW.Call(
	uintptr(hInstall),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szFeature))),
	uintptr(lpInstallStates),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiGetFeatureValidStatesW(
  hInstall: DWORD;   // MSIHANDLE
  szFeature: PWideChar;   // LPCWSTR
  lpInstallStates: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetFeatureValidStatesW';

result := DllCall("msi\MsiGetFeatureValidStatesW"
    , "UInt", hInstall   ; MSIHANDLE
    , "WStr", szFeature   ; LPCWSTR
    , "Ptr", lpInstallStates   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●MsiGetFeatureValidStatesW(hInstall, szFeature, lpInstallStates) = DLL("msi.dll", "dword MsiGetFeatureValidStatesW(dword, char*, void*)")
# 呼び出し: MsiGetFeatureValidStatesW(hInstall, szFeature, lpInstallStates)
# hInstall : MSIHANDLE -> "dword"
# szFeature : LPCWSTR -> "char*"
# lpInstallStates : DWORD* 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。