EnumServicesStatusExA

// ADVAPI32.dll  (ANSI / -A)
#include <windows.h>

BOOL EnumServicesStatusExA(
    SC_HANDLE hSCManager,
    SC_ENUM_TYPE InfoLevel,
    ENUM_SERVICE_TYPE dwServiceType,
    ENUM_SERVICE_STATE dwServiceState,
    BYTE* lpServices,   // optional
    DWORD cbBufSize,
    DWORD* pcbBytesNeeded,
    DWORD* lpServicesReturned,
    DWORD* lpResumeHandle,   // optional
    LPCSTR pszGroupName   // optional
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function EnumServicesStatusExA(
    hSCManager As IntPtr,   ' SC_HANDLE
    InfoLevel As Integer,   ' SC_ENUM_TYPE
    dwServiceType As UInteger,   ' ENUM_SERVICE_TYPE
    dwServiceState As UInteger,   ' ENUM_SERVICE_STATE
    lpServices As IntPtr,   ' BYTE* optional, out
    cbBufSize As UInteger,   ' DWORD
    <Out> ByRef pcbBytesNeeded As UInteger,   ' DWORD* out
    <Out> ByRef lpServicesReturned As UInteger,   ' DWORD* out
    lpResumeHandle As IntPtr,   ' DWORD* optional, in/out
    <MarshalAs(UnmanagedType.LPStr)> pszGroupName As String   ' LPCSTR optional
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hSCManager : SC_HANDLE
' InfoLevel : SC_ENUM_TYPE
' dwServiceType : ENUM_SERVICE_TYPE
' dwServiceState : ENUM_SERVICE_STATE
' lpServices : BYTE* optional, out
' cbBufSize : DWORD
' pcbBytesNeeded : DWORD* out
' lpServicesReturned : DWORD* out
' lpResumeHandle : DWORD* optional, in/out
' pszGroupName : LPCSTR optional
Declare PtrSafe Function EnumServicesStatusExA Lib "advapi32" ( _
    ByVal hSCManager As LongPtr, _
    ByVal InfoLevel As Long, _
    ByVal dwServiceType As Long, _
    ByVal dwServiceState As Long, _
    ByVal lpServices As LongPtr, _
    ByVal cbBufSize As Long, _
    ByRef pcbBytesNeeded As Long, _
    ByRef lpServicesReturned As Long, _
    ByVal lpResumeHandle As LongPtr, _
    ByVal pszGroupName As String) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

EnumServicesStatusExA = ctypes.windll.advapi32.EnumServicesStatusExA
EnumServicesStatusExA.restype = wintypes.BOOL
EnumServicesStatusExA.argtypes = [
    wintypes.HANDLE,  # hSCManager : SC_HANDLE
    ctypes.c_int,  # InfoLevel : SC_ENUM_TYPE
    wintypes.DWORD,  # dwServiceType : ENUM_SERVICE_TYPE
    wintypes.DWORD,  # dwServiceState : ENUM_SERVICE_STATE
    ctypes.POINTER(ctypes.c_ubyte),  # lpServices : BYTE* optional, out
    wintypes.DWORD,  # cbBufSize : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbBytesNeeded : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # lpServicesReturned : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # lpResumeHandle : DWORD* optional, in/out
    wintypes.LPCSTR,  # pszGroupName : LPCSTR optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
EnumServicesStatusExA = Fiddle::Function.new(
  lib['EnumServicesStatusExA'],
  [
    Fiddle::TYPE_VOIDP,  # hSCManager : SC_HANDLE
    Fiddle::TYPE_INT,  # InfoLevel : SC_ENUM_TYPE
    -Fiddle::TYPE_INT,  # dwServiceType : ENUM_SERVICE_TYPE
    -Fiddle::TYPE_INT,  # dwServiceState : ENUM_SERVICE_STATE
    Fiddle::TYPE_VOIDP,  # lpServices : BYTE* optional, out
    -Fiddle::TYPE_INT,  # cbBufSize : DWORD
    Fiddle::TYPE_VOIDP,  # pcbBytesNeeded : DWORD* out
    Fiddle::TYPE_VOIDP,  # lpServicesReturned : DWORD* out
    Fiddle::TYPE_VOIDP,  # lpResumeHandle : DWORD* optional, in/out
    Fiddle::TYPE_VOIDP,  # pszGroupName : LPCSTR optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "advapi32")]
extern "system" {
    fn EnumServicesStatusExA(
        hSCManager: *mut core::ffi::c_void,  // SC_HANDLE
        InfoLevel: i32,  // SC_ENUM_TYPE
        dwServiceType: u32,  // ENUM_SERVICE_TYPE
        dwServiceState: u32,  // ENUM_SERVICE_STATE
        lpServices: *mut u8,  // BYTE* optional, out
        cbBufSize: u32,  // DWORD
        pcbBytesNeeded: *mut u32,  // DWORD* out
        lpServicesReturned: *mut u32,  // DWORD* out
        lpResumeHandle: *mut u32,  // DWORD* optional, in/out
        pszGroupName: *const u8  // LPCSTR optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool EnumServicesStatusExA(IntPtr hSCManager, int InfoLevel, uint dwServiceType, uint dwServiceState, IntPtr lpServices, uint cbBufSize, out uint pcbBytesNeeded, out uint lpServicesReturned, IntPtr lpResumeHandle, [MarshalAs(UnmanagedType.LPStr)] string pszGroupName);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_EnumServicesStatusExA' -Namespace Win32 -PassThru
# $api::EnumServicesStatusExA(hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName)

#uselib "ADVAPI32.dll"
#func global EnumServicesStatusExA "EnumServicesStatusExA" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; EnumServicesStatusExA hSCManager, InfoLevel, dwServiceType, dwServiceState, varptr(lpServices), cbBufSize, varptr(pcbBytesNeeded), varptr(lpServicesReturned), varptr(lpResumeHandle), pszGroupName   ; 戻り値は stat
; hSCManager : SC_HANDLE -> "sptr"
; InfoLevel : SC_ENUM_TYPE -> "sptr"
; dwServiceType : ENUM_SERVICE_TYPE -> "sptr"
; dwServiceState : ENUM_SERVICE_STATE -> "sptr"
; lpServices : BYTE* optional, out -> "sptr"
; cbBufSize : DWORD -> "sptr"
; pcbBytesNeeded : DWORD* out -> "sptr"
; lpServicesReturned : DWORD* out -> "sptr"
; lpResumeHandle : DWORD* optional, in/out -> "sptr"
; pszGroupName : LPCSTR 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。

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procEnumServicesStatusExA = advapi32.NewProc("EnumServicesStatusExA")
)

// hSCManager (SC_HANDLE), InfoLevel (SC_ENUM_TYPE), dwServiceType (ENUM_SERVICE_TYPE), dwServiceState (ENUM_SERVICE_STATE), lpServices (BYTE* optional, out), cbBufSize (DWORD), pcbBytesNeeded (DWORD* out), lpServicesReturned (DWORD* out), lpResumeHandle (DWORD* optional, in/out), pszGroupName (LPCSTR optional)
r1, _, err := procEnumServicesStatusExA.Call(
	uintptr(hSCManager),
	uintptr(InfoLevel),
	uintptr(dwServiceType),
	uintptr(dwServiceState),
	uintptr(lpServices),
	uintptr(cbBufSize),
	uintptr(pcbBytesNeeded),
	uintptr(lpServicesReturned),
	uintptr(lpResumeHandle),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pszGroupName))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function EnumServicesStatusExA(
  hSCManager: THandle;   // SC_HANDLE
  InfoLevel: Integer;   // SC_ENUM_TYPE
  dwServiceType: DWORD;   // ENUM_SERVICE_TYPE
  dwServiceState: DWORD;   // ENUM_SERVICE_STATE
  lpServices: Pointer;   // BYTE* optional, out
  cbBufSize: DWORD;   // DWORD
  pcbBytesNeeded: Pointer;   // DWORD* out
  lpServicesReturned: Pointer;   // DWORD* out
  lpResumeHandle: Pointer;   // DWORD* optional, in/out
  pszGroupName: PAnsiChar   // LPCSTR optional
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'EnumServicesStatusExA';

result := DllCall("ADVAPI32\EnumServicesStatusExA"
    , "Ptr", hSCManager   ; SC_HANDLE
    , "Int", InfoLevel   ; SC_ENUM_TYPE
    , "UInt", dwServiceType   ; ENUM_SERVICE_TYPE
    , "UInt", dwServiceState   ; ENUM_SERVICE_STATE
    , "Ptr", lpServices   ; BYTE* optional, out
    , "UInt", cbBufSize   ; DWORD
    , "Ptr", pcbBytesNeeded   ; DWORD* out
    , "Ptr", lpServicesReturned   ; DWORD* out
    , "Ptr", lpResumeHandle   ; DWORD* optional, in/out
    , "AStr", pszGroupName   ; LPCSTR optional
    , "Int")   ; return: BOOL

●EnumServicesStatusExA(hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName) = DLL("ADVAPI32.dll", "bool EnumServicesStatusExA(void*, int, dword, dword, void*, dword, void*, void*, void*, char*)")
# 呼び出し: EnumServicesStatusExA(hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName)
# hSCManager : SC_HANDLE -> "void*"
# InfoLevel : SC_ENUM_TYPE -> "int"
# dwServiceType : ENUM_SERVICE_TYPE -> "dword"
# dwServiceState : ENUM_SERVICE_STATE -> "dword"
# lpServices : BYTE* optional, out -> "void*"
# cbBufSize : DWORD -> "dword"
# pcbBytesNeeded : DWORD* out -> "void*"
# lpServicesReturned : DWORD* out -> "void*"
# lpResumeHandle : DWORD* optional, in/out -> "void*"
# pszGroupName : LPCSTR optional -> "char*"
# 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)。

const std = @import("std");

extern "advapi32" fn EnumServicesStatusExA(
    hSCManager: ?*anyopaque, // SC_HANDLE
    InfoLevel: i32, // SC_ENUM_TYPE
    dwServiceType: u32, // ENUM_SERVICE_TYPE
    dwServiceState: u32, // ENUM_SERVICE_STATE
    lpServices: [*c]u8, // BYTE* optional, out
    cbBufSize: u32, // DWORD
    pcbBytesNeeded: [*c]u32, // DWORD* out
    lpServicesReturned: [*c]u32, // DWORD* out
    lpResumeHandle: [*c]u32, // DWORD* optional, in/out
    pszGroupName: [*c]const u8 // LPCSTR optional
) callconv(std.os.windows.WINAPI) i32;

proc EnumServicesStatusExA(
    hSCManager: pointer,  # SC_HANDLE
    InfoLevel: int32,  # SC_ENUM_TYPE
    dwServiceType: uint32,  # ENUM_SERVICE_TYPE
    dwServiceState: uint32,  # ENUM_SERVICE_STATE
    lpServices: ptr uint8,  # BYTE* optional, out
    cbBufSize: uint32,  # DWORD
    pcbBytesNeeded: ptr uint32,  # DWORD* out
    lpServicesReturned: ptr uint32,  # DWORD* out
    lpResumeHandle: ptr uint32,  # DWORD* optional, in/out
    pszGroupName: cstring  # LPCSTR optional
): int32 {.importc: "EnumServicesStatusExA", stdcall, dynlib: "ADVAPI32.dll".}

pragma(lib, "advapi32");
extern(Windows)
int EnumServicesStatusExA(
    void* hSCManager,   // SC_HANDLE
    int InfoLevel,   // SC_ENUM_TYPE
    uint dwServiceType,   // ENUM_SERVICE_TYPE
    uint dwServiceState,   // ENUM_SERVICE_STATE
    ubyte* lpServices,   // BYTE* optional, out
    uint cbBufSize,   // DWORD
    uint* pcbBytesNeeded,   // DWORD* out
    uint* lpServicesReturned,   // DWORD* out
    uint* lpResumeHandle,   // DWORD* optional, in/out
    const(char)* pszGroupName   // LPCSTR optional
);

ccall((:EnumServicesStatusExA, "ADVAPI32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Int32, UInt32, UInt32, Ptr{UInt8}, UInt32, Ptr{UInt32}, Ptr{UInt32}, Ptr{UInt32}, Cstring),
      hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName)
# hSCManager : SC_HANDLE -> Ptr{Cvoid}
# InfoLevel : SC_ENUM_TYPE -> Int32
# dwServiceType : ENUM_SERVICE_TYPE -> UInt32
# dwServiceState : ENUM_SERVICE_STATE -> UInt32
# lpServices : BYTE* optional, out -> Ptr{UInt8}
# cbBufSize : DWORD -> UInt32
# pcbBytesNeeded : DWORD* out -> Ptr{UInt32}
# lpServicesReturned : DWORD* out -> Ptr{UInt32}
# lpResumeHandle : DWORD* optional, in/out -> Ptr{UInt32}
# pszGroupName : LPCSTR optional -> Cstring
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t EnumServicesStatusExA(
    void* hSCManager,
    int32_t InfoLevel,
    uint32_t dwServiceType,
    uint32_t dwServiceState,
    uint8_t* lpServices,
    uint32_t cbBufSize,
    uint32_t* pcbBytesNeeded,
    uint32_t* lpServicesReturned,
    uint32_t* lpResumeHandle,
    const char* pszGroupName);
]]
local advapi32 = ffi.load("advapi32")
-- advapi32.EnumServicesStatusExA(hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName)
-- hSCManager : SC_HANDLE
-- InfoLevel : SC_ENUM_TYPE
-- dwServiceType : ENUM_SERVICE_TYPE
-- dwServiceState : ENUM_SERVICE_STATE
-- lpServices : BYTE* optional, out
-- cbBufSize : DWORD
-- pcbBytesNeeded : DWORD* out
-- lpServicesReturned : DWORD* out
-- lpResumeHandle : DWORD* optional, in/out
-- pszGroupName : LPCSTR optional
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('ADVAPI32.dll');
const EnumServicesStatusExA = lib.func('__stdcall', 'EnumServicesStatusExA', 'int32_t', ['void *', 'int32_t', 'uint32_t', 'uint32_t', 'uint8_t *', 'uint32_t', 'uint32_t *', 'uint32_t *', 'uint32_t *', 'str']);
// EnumServicesStatusExA(hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName)
// hSCManager : SC_HANDLE -> 'void *'
// InfoLevel : SC_ENUM_TYPE -> 'int32_t'
// dwServiceType : ENUM_SERVICE_TYPE -> 'uint32_t'
// dwServiceState : ENUM_SERVICE_STATE -> 'uint32_t'
// lpServices : BYTE* optional, out -> 'uint8_t *'
// cbBufSize : DWORD -> 'uint32_t'
// pcbBytesNeeded : DWORD* out -> 'uint32_t *'
// lpServicesReturned : DWORD* out -> 'uint32_t *'
// lpResumeHandle : DWORD* optional, in/out -> 'uint32_t *'
// pszGroupName : LPCSTR optional -> 'str'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("ADVAPI32.dll", {
  EnumServicesStatusExA: { parameters: ["pointer", "i32", "u32", "u32", "pointer", "u32", "pointer", "pointer", "pointer", "buffer"], result: "i32" },
});
// lib.symbols.EnumServicesStatusExA(hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName)
// hSCManager : SC_HANDLE -> "pointer"
// InfoLevel : SC_ENUM_TYPE -> "i32"
// dwServiceType : ENUM_SERVICE_TYPE -> "u32"
// dwServiceState : ENUM_SERVICE_STATE -> "u32"
// lpServices : BYTE* optional, out -> "pointer"
// cbBufSize : DWORD -> "u32"
// pcbBytesNeeded : DWORD* out -> "pointer"
// lpServicesReturned : DWORD* out -> "pointer"
// lpResumeHandle : DWORD* optional, in/out -> "pointer"
// pszGroupName : LPCSTR optional -> "buffer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t EnumServicesStatusExA(
    void* hSCManager,
    int32_t InfoLevel,
    uint32_t dwServiceType,
    uint32_t dwServiceState,
    uint8_t* lpServices,
    uint32_t cbBufSize,
    uint32_t* pcbBytesNeeded,
    uint32_t* lpServicesReturned,
    uint32_t* lpResumeHandle,
    const char* pszGroupName);
C, "ADVAPI32.dll");
// $ffi->EnumServicesStatusExA(hSCManager, InfoLevel, dwServiceType, dwServiceState, lpServices, cbBufSize, pcbBytesNeeded, lpServicesReturned, lpResumeHandle, pszGroupName);
// hSCManager : SC_HANDLE
// InfoLevel : SC_ENUM_TYPE
// dwServiceType : ENUM_SERVICE_TYPE
// dwServiceState : ENUM_SERVICE_STATE
// lpServices : BYTE* optional, out
// cbBufSize : DWORD
// pcbBytesNeeded : DWORD* out
// lpServicesReturned : DWORD* out
// lpResumeHandle : DWORD* optional, in/out
// pszGroupName : LPCSTR optional
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Advapi32 extends StdCallLibrary {
    Advapi32 INSTANCE = Native.load("advapi32", Advapi32.class, W32APIOptions.ASCII_OPTIONS);
    boolean EnumServicesStatusExA(
        Pointer hSCManager,   // SC_HANDLE
        int InfoLevel,   // SC_ENUM_TYPE
        int dwServiceType,   // ENUM_SERVICE_TYPE
        int dwServiceState,   // ENUM_SERVICE_STATE
        byte[] lpServices,   // BYTE* optional, out
        int cbBufSize,   // DWORD
        IntByReference pcbBytesNeeded,   // DWORD* out
        IntByReference lpServicesReturned,   // DWORD* out
        IntByReference lpResumeHandle,   // DWORD* optional, in/out
        String pszGroupName   // LPCSTR optional
    );
}

@[Link("advapi32")]
lib LibADVAPI32
  fun EnumServicesStatusExA = EnumServicesStatusExA(
    hSCManager : Void*,   # SC_HANDLE
    InfoLevel : Int32,   # SC_ENUM_TYPE
    dwServiceType : UInt32,   # ENUM_SERVICE_TYPE
    dwServiceState : UInt32,   # ENUM_SERVICE_STATE
    lpServices : UInt8*,   # BYTE* optional, out
    cbBufSize : UInt32,   # DWORD
    pcbBytesNeeded : UInt32*,   # DWORD* out
    lpServicesReturned : UInt32*,   # DWORD* out
    lpResumeHandle : UInt32*,   # DWORD* optional, in/out
    pszGroupName : UInt8*   # LPCSTR optional
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef EnumServicesStatusExANative = Int32 Function(Pointer<Void>, Int32, Uint32, Uint32, Pointer<Uint8>, Uint32, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Utf8>);
typedef EnumServicesStatusExADart = int Function(Pointer<Void>, int, int, int, Pointer<Uint8>, int, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Utf8>);
final EnumServicesStatusExA = DynamicLibrary.open('ADVAPI32.dll')
    .lookupFunction<EnumServicesStatusExANative, EnumServicesStatusExADart>('EnumServicesStatusExA');
// hSCManager : SC_HANDLE -> Pointer<Void>
// InfoLevel : SC_ENUM_TYPE -> Int32
// dwServiceType : ENUM_SERVICE_TYPE -> Uint32
// dwServiceState : ENUM_SERVICE_STATE -> Uint32
// lpServices : BYTE* optional, out -> Pointer<Uint8>
// cbBufSize : DWORD -> Uint32
// pcbBytesNeeded : DWORD* out -> Pointer<Uint32>
// lpServicesReturned : DWORD* out -> Pointer<Uint32>
// lpResumeHandle : DWORD* optional, in/out -> Pointer<Uint32>
// pszGroupName : LPCSTR optional -> Pointer<Utf8>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function EnumServicesStatusExA(
  hSCManager: THandle;   // SC_HANDLE
  InfoLevel: Integer;   // SC_ENUM_TYPE
  dwServiceType: DWORD;   // ENUM_SERVICE_TYPE
  dwServiceState: DWORD;   // ENUM_SERVICE_STATE
  lpServices: Pointer;   // BYTE* optional, out
  cbBufSize: DWORD;   // DWORD
  pcbBytesNeeded: Pointer;   // DWORD* out
  lpServicesReturned: Pointer;   // DWORD* out
  lpResumeHandle: Pointer;   // DWORD* optional, in/out
  pszGroupName: PAnsiChar   // LPCSTR optional
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'EnumServicesStatusExA';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "EnumServicesStatusExA"
  c_EnumServicesStatusExA :: Ptr () -> Int32 -> Word32 -> Word32 -> Ptr Word8 -> Word32 -> Ptr Word32 -> Ptr Word32 -> Ptr Word32 -> CString -> IO CInt
-- hSCManager : SC_HANDLE -> Ptr ()
-- InfoLevel : SC_ENUM_TYPE -> Int32
-- dwServiceType : ENUM_SERVICE_TYPE -> Word32
-- dwServiceState : ENUM_SERVICE_STATE -> Word32
-- lpServices : BYTE* optional, out -> Ptr Word8
-- cbBufSize : DWORD -> Word32
-- pcbBytesNeeded : DWORD* out -> Ptr Word32
-- lpServicesReturned : DWORD* out -> Ptr Word32
-- lpResumeHandle : DWORD* optional, in/out -> Ptr Word32
-- pszGroupName : LPCSTR optional -> CString
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let enumservicesstatusexa =
  foreign "EnumServicesStatusExA"
    ((ptr void) @-> int32_t @-> uint32_t @-> uint32_t @-> (ptr uint8_t) @-> uint32_t @-> (ptr uint32_t) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> string @-> returning int32_t)
(* hSCManager : SC_HANDLE -> (ptr void) *)
(* InfoLevel : SC_ENUM_TYPE -> int32_t *)
(* dwServiceType : ENUM_SERVICE_TYPE -> uint32_t *)
(* dwServiceState : ENUM_SERVICE_STATE -> uint32_t *)
(* lpServices : BYTE* optional, out -> (ptr uint8_t) *)
(* cbBufSize : DWORD -> uint32_t *)
(* pcbBytesNeeded : DWORD* out -> (ptr uint32_t) *)
(* lpServicesReturned : DWORD* out -> (ptr uint32_t) *)
(* lpResumeHandle : DWORD* optional, in/out -> (ptr uint32_t) *)
(* pszGroupName : LPCSTR optional -> string *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library advapi32 (t "ADVAPI32.dll"))
(cffi:use-foreign-library advapi32)

(cffi:defcfun ("EnumServicesStatusExA" enum-services-status-ex-a :convention :stdcall) :int32
  (h-scmanager :pointer)   ; SC_HANDLE
  (info-level :int32)   ; SC_ENUM_TYPE
  (dw-service-type :uint32)   ; ENUM_SERVICE_TYPE
  (dw-service-state :uint32)   ; ENUM_SERVICE_STATE
  (lp-services :pointer)   ; BYTE* optional, out
  (cb-buf-size :uint32)   ; DWORD
  (pcb-bytes-needed :pointer)   ; DWORD* out
  (lp-services-returned :pointer)   ; DWORD* out
  (lp-resume-handle :pointer)   ; DWORD* optional, in/out
  (psz-group-name :string))   ; LPCSTR optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $EnumServicesStatusExA = Win32::API::More->new('ADVAPI32',
    'BOOL EnumServicesStatusExA(HANDLE hSCManager, int InfoLevel, DWORD dwServiceType, DWORD dwServiceState, LPVOID lpServices, DWORD cbBufSize, LPVOID pcbBytesNeeded, LPVOID lpServicesReturned, LPVOID lpResumeHandle, LPCSTR pszGroupName)');
# my $ret = $EnumServicesStatusExA->Call($hSCManager, $InfoLevel, $dwServiceType, $dwServiceState, $lpServices, $cbBufSize, $pcbBytesNeeded, $lpServicesReturned, $lpResumeHandle, $pszGroupName);
# hSCManager : SC_HANDLE -> HANDLE
# InfoLevel : SC_ENUM_TYPE -> int
# dwServiceType : ENUM_SERVICE_TYPE -> DWORD
# dwServiceState : ENUM_SERVICE_STATE -> DWORD
# lpServices : BYTE* optional, out -> LPVOID
# cbBufSize : DWORD -> DWORD
# pcbBytesNeeded : DWORD* out -> LPVOID
# lpServicesReturned : DWORD* out -> LPVOID
# lpResumeHandle : DWORD* optional, in/out -> LPVOID
# pszGroupName : LPCSTR optional -> LPCSTR
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。