MsiGetFeatureStateA

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

DWORD MsiGetFeatureStateA(
    MSIHANDLE hInstall,
    LPCSTR szFeature,
    INSTALLSTATE* piInstalled,
    INSTALLSTATE* piAction
);

<DllImport("msi.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function MsiGetFeatureStateA(
    hInstall As UInteger,   ' MSIHANDLE
    <MarshalAs(UnmanagedType.LPStr)> szFeature As String,   ' LPCSTR
    ByRef piInstalled As Integer,   ' INSTALLSTATE* in/out
    ByRef piAction As Integer   ' INSTALLSTATE* in/out
) As UInteger
End Function

' hInstall : MSIHANDLE
' szFeature : LPCSTR
' piInstalled : INSTALLSTATE* in/out
' piAction : INSTALLSTATE* in/out
Declare PtrSafe Function MsiGetFeatureStateA Lib "msi" ( _
    ByVal hInstall As Long, _
    ByVal szFeature As String, _
    ByRef piInstalled As Long, _
    ByRef piAction 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

MsiGetFeatureStateA = ctypes.windll.msi.MsiGetFeatureStateA
MsiGetFeatureStateA.restype = wintypes.DWORD
MsiGetFeatureStateA.argtypes = [
    wintypes.DWORD,  # hInstall : MSIHANDLE
    wintypes.LPCSTR,  # szFeature : LPCSTR
    ctypes.c_void_p,  # piInstalled : INSTALLSTATE* in/out
    ctypes.c_void_p,  # piAction : INSTALLSTATE* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetFeatureStateA = Fiddle::Function.new(
  lib['MsiGetFeatureStateA'],
  [
    -Fiddle::TYPE_INT,  # hInstall : MSIHANDLE
    Fiddle::TYPE_VOIDP,  # szFeature : LPCSTR
    Fiddle::TYPE_VOIDP,  # piInstalled : INSTALLSTATE* in/out
    Fiddle::TYPE_VOIDP,  # piAction : INSTALLSTATE* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiGetFeatureStateA(
        hInstall: u32,  // MSIHANDLE
        szFeature: *const u8,  // LPCSTR
        piInstalled: *mut i32,  // INSTALLSTATE* in/out
        piAction: *mut i32  // INSTALLSTATE* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Ansi)]
public static extern uint MsiGetFeatureStateA(uint hInstall, [MarshalAs(UnmanagedType.LPStr)] string szFeature, ref int piInstalled, ref int piAction);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetFeatureStateA' -Namespace Win32 -PassThru
# $api::MsiGetFeatureStateA(hInstall, szFeature, piInstalled, piAction)

#uselib "msi.dll"
#func global MsiGetFeatureStateA "MsiGetFeatureStateA" sptr, sptr, sptr, sptr
; MsiGetFeatureStateA hInstall, szFeature, piInstalled, piAction   ; 戻り値は stat
; hInstall : MSIHANDLE -> "sptr"
; szFeature : LPCSTR -> "sptr"
; piInstalled : INSTALLSTATE* in/out -> "sptr"
; piAction : INSTALLSTATE* 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 MsiGetFeatureStateA "MsiGetFeatureStateA" int, str, int, int
; res = MsiGetFeatureStateA(hInstall, szFeature, piInstalled, piAction)
; hInstall : MSIHANDLE -> "int"
; szFeature : LPCSTR -> "str"
; piInstalled : INSTALLSTATE* in/out -> "int"
; piAction : INSTALLSTATE* in/out -> "int"

; DWORD MsiGetFeatureStateA(MSIHANDLE hInstall, LPCSTR szFeature, INSTALLSTATE* piInstalled, INSTALLSTATE* piAction)
#uselib "msi.dll"
#cfunc global MsiGetFeatureStateA "MsiGetFeatureStateA" int, str, int, int
; res = MsiGetFeatureStateA(hInstall, szFeature, piInstalled, piAction)
; hInstall : MSIHANDLE -> "int"
; szFeature : LPCSTR -> "str"
; piInstalled : INSTALLSTATE* in/out -> "int"
; piAction : INSTALLSTATE* in/out -> "int"

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiGetFeatureStateA = msi.NewProc("MsiGetFeatureStateA")
)

// hInstall (MSIHANDLE), szFeature (LPCSTR), piInstalled (INSTALLSTATE* in/out), piAction (INSTALLSTATE* in/out)
r1, _, err := procMsiGetFeatureStateA.Call(
	uintptr(hInstall),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szFeature))),
	uintptr(piInstalled),
	uintptr(piAction),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiGetFeatureStateA(
  hInstall: DWORD;   // MSIHANDLE
  szFeature: PAnsiChar;   // LPCSTR
  piInstalled: Pointer;   // INSTALLSTATE* in/out
  piAction: Pointer   // INSTALLSTATE* in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetFeatureStateA';

result := DllCall("msi\MsiGetFeatureStateA"
    , "UInt", hInstall   ; MSIHANDLE
    , "AStr", szFeature   ; LPCSTR
    , "Ptr", piInstalled   ; INSTALLSTATE* in/out
    , "Ptr", piAction   ; INSTALLSTATE* in/out
    , "UInt")   ; return: DWORD

●MsiGetFeatureStateA(hInstall, szFeature, piInstalled, piAction) = DLL("msi.dll", "dword MsiGetFeatureStateA(dword, char*, void*, void*)")
# 呼び出し: MsiGetFeatureStateA(hInstall, szFeature, piInstalled, piAction)
# hInstall : MSIHANDLE -> "dword"
# szFeature : LPCSTR -> "char*"
# piInstalled : INSTALLSTATE* in/out -> "void*"
# piAction : INSTALLSTATE* 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)。