OpenSCManagerA

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

SC_HANDLE OpenSCManagerA(
    LPCSTR lpMachineName,   // optional
    LPCSTR lpDatabaseName,   // optional
    DWORD dwDesiredAccess
);

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

' lpMachineName : LPCSTR optional
' lpDatabaseName : LPCSTR optional
' dwDesiredAccess : DWORD
Declare PtrSafe Function OpenSCManagerA Lib "advapi32" ( _
    ByVal lpMachineName As String, _
    ByVal lpDatabaseName 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

OpenSCManagerA = ctypes.windll.advapi32.OpenSCManagerA
OpenSCManagerA.restype = ctypes.c_void_p
OpenSCManagerA.argtypes = [
    wintypes.LPCSTR,  # lpMachineName : LPCSTR optional
    wintypes.LPCSTR,  # lpDatabaseName : LPCSTR optional
    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')
OpenSCManagerA = Fiddle::Function.new(
  lib['OpenSCManagerA'],
  [
    Fiddle::TYPE_VOIDP,  # lpMachineName : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # lpDatabaseName : LPCSTR optional
    -Fiddle::TYPE_INT,  # dwDesiredAccess : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "advapi32")]
extern "system" {
    fn OpenSCManagerA(
        lpMachineName: *const u8,  // LPCSTR optional
        lpDatabaseName: *const u8,  // LPCSTR optional
        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 OpenSCManagerA([MarshalAs(UnmanagedType.LPStr)] string lpMachineName, [MarshalAs(UnmanagedType.LPStr)] string lpDatabaseName, uint dwDesiredAccess);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_OpenSCManagerA' -Namespace Win32 -PassThru
# $api::OpenSCManagerA(lpMachineName, lpDatabaseName, dwDesiredAccess)

#uselib "ADVAPI32.dll"
#func global OpenSCManagerA "OpenSCManagerA" sptr, sptr, sptr
; OpenSCManagerA lpMachineName, lpDatabaseName, dwDesiredAccess   ; 戻り値は stat
; lpMachineName : LPCSTR optional -> "sptr"
; lpDatabaseName : LPCSTR optional -> "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 OpenSCManagerA "OpenSCManagerA" str, str, int
; res = OpenSCManagerA(lpMachineName, lpDatabaseName, dwDesiredAccess)
; lpMachineName : LPCSTR optional -> "str"
; lpDatabaseName : LPCSTR optional -> "str"
; dwDesiredAccess : DWORD -> "int"

; SC_HANDLE OpenSCManagerA(LPCSTR lpMachineName, LPCSTR lpDatabaseName, DWORD dwDesiredAccess)
#uselib "ADVAPI32.dll"
#cfunc global OpenSCManagerA "OpenSCManagerA" str, str, int
; res = OpenSCManagerA(lpMachineName, lpDatabaseName, dwDesiredAccess)
; lpMachineName : LPCSTR optional -> "str"
; lpDatabaseName : LPCSTR optional -> "str"
; dwDesiredAccess : DWORD -> "int"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procOpenSCManagerA = advapi32.NewProc("OpenSCManagerA")
)

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

function OpenSCManagerA(
  lpMachineName: PAnsiChar;   // LPCSTR optional
  lpDatabaseName: PAnsiChar;   // LPCSTR optional
  dwDesiredAccess: DWORD   // DWORD
): THandle; stdcall;
  external 'ADVAPI32.dll' name 'OpenSCManagerA';

result := DllCall("ADVAPI32\OpenSCManagerA"
    , "AStr", lpMachineName   ; LPCSTR optional
    , "AStr", lpDatabaseName   ; LPCSTR optional
    , "UInt", dwDesiredAccess   ; DWORD
    , "Ptr")   ; return: SC_HANDLE

●OpenSCManagerA(lpMachineName, lpDatabaseName, dwDesiredAccess) = DLL("ADVAPI32.dll", "void* OpenSCManagerA(char*, char*, dword)")
# 呼び出し: OpenSCManagerA(lpMachineName, lpDatabaseName, dwDesiredAccess)
# lpMachineName : LPCSTR optional -> "char*"
# lpDatabaseName : LPCSTR optional -> "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)。