MsiUseFeatureExA

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

INSTALLSTATE MsiUseFeatureExA(
    LPCSTR szProduct,
    LPCSTR szFeature,
    DWORD dwInstallMode,
    DWORD dwReserved   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function MsiUseFeatureExA(
    <MarshalAs(UnmanagedType.LPStr)> szProduct As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> szFeature As String,   ' LPCSTR
    dwInstallMode As UInteger,   ' DWORD
    dwReserved As UInteger   ' DWORD optional
) As Integer
End Function

' szProduct : LPCSTR
' szFeature : LPCSTR
' dwInstallMode : DWORD
' dwReserved : DWORD optional
Declare PtrSafe Function MsiUseFeatureExA Lib "msi" ( _
    ByVal szProduct As String, _
    ByVal szFeature As String, _
    ByVal dwInstallMode As Long, _
    ByVal dwReserved As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MsiUseFeatureExA = ctypes.windll.msi.MsiUseFeatureExA
MsiUseFeatureExA.restype = ctypes.c_int
MsiUseFeatureExA.argtypes = [
    wintypes.LPCSTR,  # szProduct : LPCSTR
    wintypes.LPCSTR,  # szFeature : LPCSTR
    wintypes.DWORD,  # dwInstallMode : DWORD
    wintypes.DWORD,  # dwReserved : DWORD optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiUseFeatureExA = Fiddle::Function.new(
  lib['MsiUseFeatureExA'],
  [
    Fiddle::TYPE_VOIDP,  # szProduct : LPCSTR
    Fiddle::TYPE_VOIDP,  # szFeature : LPCSTR
    -Fiddle::TYPE_INT,  # dwInstallMode : DWORD
    -Fiddle::TYPE_INT,  # dwReserved : DWORD optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiUseFeatureExA(
        szProduct: *const u8,  // LPCSTR
        szFeature: *const u8,  // LPCSTR
        dwInstallMode: u32,  // DWORD
        dwReserved: u32  // DWORD optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Ansi)]
public static extern int MsiUseFeatureExA([MarshalAs(UnmanagedType.LPStr)] string szProduct, [MarshalAs(UnmanagedType.LPStr)] string szFeature, uint dwInstallMode, uint dwReserved);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiUseFeatureExA' -Namespace Win32 -PassThru
# $api::MsiUseFeatureExA(szProduct, szFeature, dwInstallMode, dwReserved)

#uselib "msi.dll"
#func global MsiUseFeatureExA "MsiUseFeatureExA" sptr, sptr, sptr, sptr
; MsiUseFeatureExA szProduct, szFeature, dwInstallMode, dwReserved   ; 戻り値は stat
; szProduct : LPCSTR -> "sptr"
; szFeature : LPCSTR -> "sptr"
; dwInstallMode : DWORD -> "sptr"
; dwReserved : DWORD optional -> "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 MsiUseFeatureExA "MsiUseFeatureExA" str, str, int, int
; res = MsiUseFeatureExA(szProduct, szFeature, dwInstallMode, dwReserved)
; szProduct : LPCSTR -> "str"
; szFeature : LPCSTR -> "str"
; dwInstallMode : DWORD -> "int"
; dwReserved : DWORD optional -> "int"

; INSTALLSTATE MsiUseFeatureExA(LPCSTR szProduct, LPCSTR szFeature, DWORD dwInstallMode, DWORD dwReserved)
#uselib "msi.dll"
#cfunc global MsiUseFeatureExA "MsiUseFeatureExA" str, str, int, int
; res = MsiUseFeatureExA(szProduct, szFeature, dwInstallMode, dwReserved)
; szProduct : LPCSTR -> "str"
; szFeature : LPCSTR -> "str"
; dwInstallMode : DWORD -> "int"
; dwReserved : DWORD optional -> "int"

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiUseFeatureExA = msi.NewProc("MsiUseFeatureExA")
)

// szProduct (LPCSTR), szFeature (LPCSTR), dwInstallMode (DWORD), dwReserved (DWORD optional)
r1, _, err := procMsiUseFeatureExA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szProduct))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szFeature))),
	uintptr(dwInstallMode),
	uintptr(dwReserved),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INSTALLSTATE

function MsiUseFeatureExA(
  szProduct: PAnsiChar;   // LPCSTR
  szFeature: PAnsiChar;   // LPCSTR
  dwInstallMode: DWORD;   // DWORD
  dwReserved: DWORD   // DWORD optional
): Integer; stdcall;
  external 'msi.dll' name 'MsiUseFeatureExA';

result := DllCall("msi\MsiUseFeatureExA"
    , "AStr", szProduct   ; LPCSTR
    , "AStr", szFeature   ; LPCSTR
    , "UInt", dwInstallMode   ; DWORD
    , "UInt", dwReserved   ; DWORD optional
    , "Int")   ; return: INSTALLSTATE

●MsiUseFeatureExA(szProduct, szFeature, dwInstallMode, dwReserved) = DLL("msi.dll", "int MsiUseFeatureExA(char*, char*, dword, dword)")
# 呼び出し: MsiUseFeatureExA(szProduct, szFeature, dwInstallMode, dwReserved)
# szProduct : LPCSTR -> "char*"
# szFeature : LPCSTR -> "char*"
# dwInstallMode : DWORD -> "dword"
# dwReserved : DWORD optional -> "dword"
# 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)。