GetServiceDisplayNameW

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

BOOL GetServiceDisplayNameW(
    SC_HANDLE hSCManager,
    LPCWSTR lpServiceName,
    LPWSTR lpDisplayName,   // optional
    DWORD* lpcchBuffer
);

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

' hSCManager : SC_HANDLE
' lpServiceName : LPCWSTR
' lpDisplayName : LPWSTR optional, out
' lpcchBuffer : DWORD* in/out
Declare PtrSafe Function GetServiceDisplayNameW Lib "advapi32" ( _
    ByVal hSCManager As LongPtr, _
    ByVal lpServiceName As LongPtr, _
    ByVal lpDisplayName As LongPtr, _
    ByRef lpcchBuffer As Long) As Long
' 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

GetServiceDisplayNameW = ctypes.windll.advapi32.GetServiceDisplayNameW
GetServiceDisplayNameW.restype = wintypes.BOOL
GetServiceDisplayNameW.argtypes = [
    wintypes.HANDLE,  # hSCManager : SC_HANDLE
    wintypes.LPCWSTR,  # lpServiceName : LPCWSTR
    wintypes.LPWSTR,  # lpDisplayName : LPWSTR 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')
GetServiceDisplayNameW = Fiddle::Function.new(
  lib['GetServiceDisplayNameW'],
  [
    Fiddle::TYPE_VOIDP,  # hSCManager : SC_HANDLE
    Fiddle::TYPE_VOIDP,  # lpServiceName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpDisplayName : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # lpcchBuffer : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "advapi32")]
extern "system" {
    fn GetServiceDisplayNameW(
        hSCManager: *mut core::ffi::c_void,  // SC_HANDLE
        lpServiceName: *const u16,  // LPCWSTR
        lpDisplayName: *mut u16,  // LPWSTR 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.Unicode, SetLastError = true)]
public static extern bool GetServiceDisplayNameW(IntPtr hSCManager, [MarshalAs(UnmanagedType.LPWStr)] string lpServiceName, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpDisplayName, ref uint lpcchBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ADVAPI32_GetServiceDisplayNameW' -Namespace Win32 -PassThru
# $api::GetServiceDisplayNameW(hSCManager, lpServiceName, lpDisplayName, lpcchBuffer)

#uselib "ADVAPI32.dll"
#func global GetServiceDisplayNameW "GetServiceDisplayNameW" wptr, wptr, wptr, wptr
; GetServiceDisplayNameW hSCManager, lpServiceName, varptr(lpDisplayName), varptr(lpcchBuffer)   ; 戻り値は stat
; hSCManager : SC_HANDLE -> "wptr"
; lpServiceName : LPCWSTR -> "wptr"
; lpDisplayName : LPWSTR optional, out -> "wptr"
; lpcchBuffer : DWORD* in/out -> "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 GetServiceDisplayNameW "GetServiceDisplayNameW" sptr, wstr, var, var
; res = GetServiceDisplayNameW(hSCManager, lpServiceName, lpDisplayName, lpcchBuffer)
; hSCManager : SC_HANDLE -> "sptr"
; lpServiceName : LPCWSTR -> "wstr"
; lpDisplayName : LPWSTR 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 GetServiceDisplayNameW(SC_HANDLE hSCManager, LPCWSTR lpServiceName, LPWSTR lpDisplayName, DWORD* lpcchBuffer)
#uselib "ADVAPI32.dll"
#cfunc global GetServiceDisplayNameW "GetServiceDisplayNameW" intptr, wstr, var, var
; res = GetServiceDisplayNameW(hSCManager, lpServiceName, lpDisplayName, lpcchBuffer)
; hSCManager : SC_HANDLE -> "intptr"
; lpServiceName : LPCWSTR -> "wstr"
; lpDisplayName : LPWSTR 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")
	procGetServiceDisplayNameW = advapi32.NewProc("GetServiceDisplayNameW")
)

// hSCManager (SC_HANDLE), lpServiceName (LPCWSTR), lpDisplayName (LPWSTR optional, out), lpcchBuffer (DWORD* in/out)
r1, _, err := procGetServiceDisplayNameW.Call(
	uintptr(hSCManager),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpServiceName))),
	uintptr(lpDisplayName),
	uintptr(lpcchBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetServiceDisplayNameW(
  hSCManager: THandle;   // SC_HANDLE
  lpServiceName: PWideChar;   // LPCWSTR
  lpDisplayName: PWideChar;   // LPWSTR optional, out
  lpcchBuffer: Pointer   // DWORD* in/out
): BOOL; stdcall;
  external 'ADVAPI32.dll' name 'GetServiceDisplayNameW';

result := DllCall("ADVAPI32\GetServiceDisplayNameW"
    , "Ptr", hSCManager   ; SC_HANDLE
    , "WStr", lpServiceName   ; LPCWSTR
    , "Ptr", lpDisplayName   ; LPWSTR optional, out
    , "Ptr", lpcchBuffer   ; DWORD* in/out
    , "Int")   ; return: BOOL

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