RegisterServiceCtrlHandlerW

// ADVAPI32.dll  (Unicode / -W)
#include <windows.h>

SERVICE_STATUS_HANDLE RegisterServiceCtrlHandlerW(
    LPCWSTR lpServiceName,
    LPHANDLER_FUNCTION lpHandlerProc
);

<DllImport("ADVAPI32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function RegisterServiceCtrlHandlerW(
    <MarshalAs(UnmanagedType.LPWStr)> lpServiceName As String,   ' LPCWSTR
    lpHandlerProc As IntPtr   ' LPHANDLER_FUNCTION
) As IntPtr
End Function

' lpServiceName : LPCWSTR
' lpHandlerProc : LPHANDLER_FUNCTION
Declare PtrSafe Function RegisterServiceCtrlHandlerW Lib "advapi32" ( _
    ByVal lpServiceName As LongPtr, _
    ByVal lpHandlerProc As LongPtr) As LongPtr
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

RegisterServiceCtrlHandlerW = ctypes.windll.advapi32.RegisterServiceCtrlHandlerW
RegisterServiceCtrlHandlerW.restype = ctypes.c_void_p
RegisterServiceCtrlHandlerW.argtypes = [
    wintypes.LPCWSTR,  # lpServiceName : LPCWSTR
    ctypes.c_void_p,  # lpHandlerProc : LPHANDLER_FUNCTION
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ADVAPI32.dll')
RegisterServiceCtrlHandlerW = Fiddle::Function.new(
  lib['RegisterServiceCtrlHandlerW'],
  [
    Fiddle::TYPE_VOIDP,  # lpServiceName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpHandlerProc : LPHANDLER_FUNCTION
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn RegisterServiceCtrlHandlerW(
        lpServiceName: *const u16,  // LPCWSTR
        lpHandlerProc: *const core::ffi::c_void  // LPHANDLER_FUNCTION
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ADVAPI32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr RegisterServiceCtrlHandlerW([MarshalAs(UnmanagedType.LPWStr)] string lpServiceName, IntPtr lpHandlerProc);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_RegisterServiceCtrlHandlerW' -Namespace Win32 -PassThru
# $api::RegisterServiceCtrlHandlerW(lpServiceName, lpHandlerProc)

#uselib "ADVAPI32.dll"
#func global RegisterServiceCtrlHandlerW "RegisterServiceCtrlHandlerW" wptr, wptr
; RegisterServiceCtrlHandlerW lpServiceName, lpHandlerProc   ; 戻り値は stat
; lpServiceName : LPCWSTR -> "wptr"
; lpHandlerProc : LPHANDLER_FUNCTION -> "wptr"
; ※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 RegisterServiceCtrlHandlerW "RegisterServiceCtrlHandlerW" wstr, sptr
; res = RegisterServiceCtrlHandlerW(lpServiceName, lpHandlerProc)
; lpServiceName : LPCWSTR -> "wstr"
; lpHandlerProc : LPHANDLER_FUNCTION -> "sptr"

; SERVICE_STATUS_HANDLE RegisterServiceCtrlHandlerW(LPCWSTR lpServiceName, LPHANDLER_FUNCTION lpHandlerProc)
#uselib "ADVAPI32.dll"
#cfunc global RegisterServiceCtrlHandlerW "RegisterServiceCtrlHandlerW" wstr, intptr
; res = RegisterServiceCtrlHandlerW(lpServiceName, lpHandlerProc)
; lpServiceName : LPCWSTR -> "wstr"
; lpHandlerProc : LPHANDLER_FUNCTION -> "intptr"

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

var (
	advapi32 = windows.NewLazySystemDLL("ADVAPI32.dll")
	procRegisterServiceCtrlHandlerW = advapi32.NewProc("RegisterServiceCtrlHandlerW")
)

// lpServiceName (LPCWSTR), lpHandlerProc (LPHANDLER_FUNCTION)
r1, _, err := procRegisterServiceCtrlHandlerW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpServiceName))),
	uintptr(lpHandlerProc),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // SERVICE_STATUS_HANDLE

function RegisterServiceCtrlHandlerW(
  lpServiceName: PWideChar;   // LPCWSTR
  lpHandlerProc: Pointer   // LPHANDLER_FUNCTION
): THandle; stdcall;
  external 'ADVAPI32.dll' name 'RegisterServiceCtrlHandlerW';

result := DllCall("ADVAPI32\RegisterServiceCtrlHandlerW"
    , "WStr", lpServiceName   ; LPCWSTR
    , "Ptr", lpHandlerProc   ; LPHANDLER_FUNCTION
    , "Ptr")   ; return: SERVICE_STATUS_HANDLE

●RegisterServiceCtrlHandlerW(lpServiceName, lpHandlerProc) = DLL("ADVAPI32.dll", "void* RegisterServiceCtrlHandlerW(char*, void*)")
# 呼び出し: RegisterServiceCtrlHandlerW(lpServiceName, lpHandlerProc)
# lpServiceName : LPCWSTR -> "char*"
# lpHandlerProc : LPHANDLER_FUNCTION -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。