OpenServiceA

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

SC_HANDLE OpenServiceA(
    SC_HANDLE hSCManager,
    LPCSTR lpServiceName,
    DWORD dwDesiredAccess
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function OpenServiceA(
    hSCManager As IntPtr,   ' SC_HANDLE
    <MarshalAs(UnmanagedType.LPStr)> lpServiceName As String,   ' LPCSTR
    dwDesiredAccess As UInteger   ' DWORD
) As IntPtr
End Function

' hSCManager : SC_HANDLE
' lpServiceName : LPCSTR
' dwDesiredAccess : DWORD
Declare PtrSafe Function OpenServiceA Lib "advapi32" ( _
    ByVal hSCManager As LongPtr, _
    ByVal lpServiceName As String, _
    ByVal dwDesiredAccess As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

OpenServiceA = ctypes.windll.advapi32.OpenServiceA
OpenServiceA.restype = ctypes.c_void_p
OpenServiceA.argtypes = [
    wintypes.HANDLE,  # hSCManager : SC_HANDLE
    wintypes.LPCSTR,  # lpServiceName : LPCSTR
    wintypes.DWORD,  # dwDesiredAccess : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
OpenServiceA = Fiddle::Function.new(
  lib['OpenServiceA'],
  [
    Fiddle::TYPE_VOIDP,  # hSCManager : SC_HANDLE
    Fiddle::TYPE_VOIDP,  # lpServiceName : LPCSTR
    -Fiddle::TYPE_INT,  # dwDesiredAccess : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "advapi32")]
extern "system" {
    fn OpenServiceA(
        hSCManager: *mut core::ffi::c_void,  // SC_HANDLE
        lpServiceName: *const u8,  // LPCSTR
        dwDesiredAccess: u32  // DWORD
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ADVAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern IntPtr OpenServiceA(IntPtr hSCManager, [MarshalAs(UnmanagedType.LPStr)] string lpServiceName, uint dwDesiredAccess);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_OpenServiceA' -Namespace Win32 -PassThru
# $api::OpenServiceA(hSCManager, lpServiceName, dwDesiredAccess)

#uselib "ADVAPI32.dll"
#func global OpenServiceA "OpenServiceA" sptr, sptr, sptr
; OpenServiceA hSCManager, lpServiceName, dwDesiredAccess   ; 戻り値は stat
; hSCManager : SC_HANDLE -> "sptr"
; lpServiceName : LPCSTR -> "sptr"
; dwDesiredAccess : DWORD -> "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 "ADVAPI32.dll"
#cfunc global OpenServiceA "OpenServiceA" sptr, str, int
; res = OpenServiceA(hSCManager, lpServiceName, dwDesiredAccess)
; hSCManager : SC_HANDLE -> "sptr"
; lpServiceName : LPCSTR -> "str"
; dwDesiredAccess : DWORD -> "int"

; SC_HANDLE OpenServiceA(SC_HANDLE hSCManager, LPCSTR lpServiceName, DWORD dwDesiredAccess)
#uselib "ADVAPI32.dll"
#cfunc global OpenServiceA "OpenServiceA" intptr, str, int
; res = OpenServiceA(hSCManager, lpServiceName, dwDesiredAccess)
; hSCManager : SC_HANDLE -> "intptr"
; lpServiceName : LPCSTR -> "str"
; dwDesiredAccess : DWORD -> "int"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procOpenServiceA = advapi32.NewProc("OpenServiceA")
)

// hSCManager (SC_HANDLE), lpServiceName (LPCSTR), dwDesiredAccess (DWORD)
r1, _, err := procOpenServiceA.Call(
	uintptr(hSCManager),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpServiceName))),
	uintptr(dwDesiredAccess),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SC_HANDLE

function OpenServiceA(
  hSCManager: THandle;   // SC_HANDLE
  lpServiceName: PAnsiChar;   // LPCSTR
  dwDesiredAccess: DWORD   // DWORD
): THandle; stdcall;
  external 'ADVAPI32.dll' name 'OpenServiceA';

result := DllCall("ADVAPI32\OpenServiceA"
    , "Ptr", hSCManager   ; SC_HANDLE
    , "AStr", lpServiceName   ; LPCSTR
    , "UInt", dwDesiredAccess   ; DWORD
    , "Ptr")   ; return: SC_HANDLE

●OpenServiceA(hSCManager, lpServiceName, dwDesiredAccess) = DLL("ADVAPI32.dll", "void* OpenServiceA(void*, char*, dword)")
# 呼び出し: OpenServiceA(hSCManager, lpServiceName, dwDesiredAccess)
# hSCManager : SC_HANDLE -> "void*"
# lpServiceName : LPCSTR -> "char*"
# dwDesiredAccess : DWORD -> "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)。