GetServiceKeyNameA

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

BOOL GetServiceKeyNameA(
    SC_HANDLE hSCManager,
    LPCSTR lpDisplayName,
    LPSTR lpServiceName,   // optional
    DWORD* lpcchBuffer
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetServiceKeyNameA(
    hSCManager As IntPtr,   ' SC_HANDLE
    <MarshalAs(UnmanagedType.LPStr)> lpDisplayName As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> lpServiceName As System.Text.StringBuilder,   ' LPSTR optional, out
    ByRef lpcchBuffer As UInteger   ' DWORD* in/out
) As Boolean
End Function

' hSCManager : SC_HANDLE
' lpDisplayName : LPCSTR
' lpServiceName : LPSTR optional, out
' lpcchBuffer : DWORD* in/out
Declare PtrSafe Function GetServiceKeyNameA Lib "advapi32" ( _
    ByVal hSCManager As LongPtr, _
    ByVal lpDisplayName As String, _
    ByVal lpServiceName As String, _
    ByRef lpcchBuffer 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

GetServiceKeyNameA = ctypes.windll.advapi32.GetServiceKeyNameA
GetServiceKeyNameA.restype = wintypes.BOOL
GetServiceKeyNameA.argtypes = [
    wintypes.HANDLE,  # hSCManager : SC_HANDLE
    wintypes.LPCSTR,  # lpDisplayName : LPCSTR
    wintypes.LPSTR,  # lpServiceName : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # lpcchBuffer : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
GetServiceKeyNameA = Fiddle::Function.new(
  lib['GetServiceKeyNameA'],
  [
    Fiddle::TYPE_VOIDP,  # hSCManager : SC_HANDLE
    Fiddle::TYPE_VOIDP,  # lpDisplayName : LPCSTR
    Fiddle::TYPE_VOIDP,  # lpServiceName : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # lpcchBuffer : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "advapi32")]
extern "system" {
    fn GetServiceKeyNameA(
        hSCManager: *mut core::ffi::c_void,  // SC_HANDLE
        lpDisplayName: *const u8,  // LPCSTR
        lpServiceName: *mut u8,  // LPSTR optional, out
        lpcchBuffer: *mut u32  // DWORD* in/out
    ) -> 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 GetServiceKeyNameA(IntPtr hSCManager, [MarshalAs(UnmanagedType.LPStr)] string lpDisplayName, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpServiceName, ref uint lpcchBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_GetServiceKeyNameA' -Namespace Win32 -PassThru
# $api::GetServiceKeyNameA(hSCManager, lpDisplayName, lpServiceName, lpcchBuffer)

#uselib "ADVAPI32.dll"
#func global GetServiceKeyNameA "GetServiceKeyNameA" sptr, sptr, sptr, sptr
; GetServiceKeyNameA hSCManager, lpDisplayName, varptr(lpServiceName), varptr(lpcchBuffer)   ; 戻り値は stat
; hSCManager : SC_HANDLE -> "sptr"
; lpDisplayName : LPCSTR -> "sptr"
; lpServiceName : LPSTR optional, out -> "sptr"
; lpcchBuffer : DWORD* 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 "ADVAPI32.dll"
#cfunc global GetServiceKeyNameA "GetServiceKeyNameA" sptr, str, var, var
; res = GetServiceKeyNameA(hSCManager, lpDisplayName, lpServiceName, lpcchBuffer)
; hSCManager : SC_HANDLE -> "sptr"
; lpDisplayName : LPCSTR -> "str"
; lpServiceName : LPSTR optional, out -> "var"
; lpcchBuffer : DWORD* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; BOOL GetServiceKeyNameA(SC_HANDLE hSCManager, LPCSTR lpDisplayName, LPSTR lpServiceName, DWORD* lpcchBuffer)
#uselib "ADVAPI32.dll"
#cfunc global GetServiceKeyNameA "GetServiceKeyNameA" intptr, str, var, var
; res = GetServiceKeyNameA(hSCManager, lpDisplayName, lpServiceName, lpcchBuffer)
; hSCManager : SC_HANDLE -> "intptr"
; lpDisplayName : LPCSTR -> "str"
; lpServiceName : LPSTR optional, out -> "var"
; lpcchBuffer : DWORD* in/out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procGetServiceKeyNameA = advapi32.NewProc("GetServiceKeyNameA")
)

// hSCManager (SC_HANDLE), lpDisplayName (LPCSTR), lpServiceName (LPSTR optional, out), lpcchBuffer (DWORD* in/out)
r1, _, err := procGetServiceKeyNameA.Call(
	uintptr(hSCManager),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpDisplayName))),
	uintptr(lpServiceName),
	uintptr(lpcchBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetServiceKeyNameA(
  hSCManager: THandle;   // SC_HANDLE
  lpDisplayName: PAnsiChar;   // LPCSTR
  lpServiceName: PAnsiChar;   // LPSTR optional, out
  lpcchBuffer: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'GetServiceKeyNameA';

result := DllCall("ADVAPI32\GetServiceKeyNameA"
    , "Ptr", hSCManager   ; SC_HANDLE
    , "AStr", lpDisplayName   ; LPCSTR
    , "Ptr", lpServiceName   ; LPSTR optional, out
    , "Ptr", lpcchBuffer   ; DWORD* in/out
    , "Int")   ; return: BOOL

●GetServiceKeyNameA(hSCManager, lpDisplayName, lpServiceName, lpcchBuffer) = DLL("ADVAPI32.dll", "bool GetServiceKeyNameA(void*, char*, char*, void*)")
# 呼び出し: GetServiceKeyNameA(hSCManager, lpDisplayName, lpServiceName, lpcchBuffer)
# hSCManager : SC_HANDLE -> "void*"
# lpDisplayName : LPCSTR -> "char*"
# lpServiceName : LPSTR optional, out -> "char*"
# lpcchBuffer : DWORD* 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)。