GetServiceA

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

INT GetServiceA(
    DWORD dwNameSpace,
    GUID* lpGuid,
    LPSTR lpServiceName,
    DWORD dwProperties,
    void* lpBuffer,
    DWORD* lpdwBufferSize,
    SERVICE_ASYNC_INFO* lpServiceAsyncInfo   // optional
);

<DllImport("MSWSOCK.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetServiceA(
    dwNameSpace As UInteger,   ' DWORD
    ByRef lpGuid As Guid,   ' GUID*
    <MarshalAs(UnmanagedType.LPStr)> lpServiceName As String,   ' LPSTR
    dwProperties As UInteger,   ' DWORD
    lpBuffer As IntPtr,   ' void* out
    ByRef lpdwBufferSize As UInteger,   ' DWORD* in/out
    lpServiceAsyncInfo As IntPtr   ' SERVICE_ASYNC_INFO* optional
) As Integer
End Function

' dwNameSpace : DWORD
' lpGuid : GUID*
' lpServiceName : LPSTR
' dwProperties : DWORD
' lpBuffer : void* out
' lpdwBufferSize : DWORD* in/out
' lpServiceAsyncInfo : SERVICE_ASYNC_INFO* optional
Declare PtrSafe Function GetServiceA Lib "mswsock" ( _
    ByVal dwNameSpace As Long, _
    ByVal lpGuid As LongPtr, _
    ByVal lpServiceName As String, _
    ByVal dwProperties As Long, _
    ByVal lpBuffer As LongPtr, _
    ByRef lpdwBufferSize As Long, _
    ByVal lpServiceAsyncInfo As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetServiceA = ctypes.windll.mswsock.GetServiceA
GetServiceA.restype = ctypes.c_int
GetServiceA.argtypes = [
    wintypes.DWORD,  # dwNameSpace : DWORD
    ctypes.c_void_p,  # lpGuid : GUID*
    wintypes.LPCSTR,  # lpServiceName : LPSTR
    wintypes.DWORD,  # dwProperties : DWORD
    ctypes.POINTER(None),  # lpBuffer : void* out
    ctypes.POINTER(wintypes.DWORD),  # lpdwBufferSize : DWORD* in/out
    ctypes.c_void_p,  # lpServiceAsyncInfo : SERVICE_ASYNC_INFO* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MSWSOCK.dll')
GetServiceA = Fiddle::Function.new(
  lib['GetServiceA'],
  [
    -Fiddle::TYPE_INT,  # dwNameSpace : DWORD
    Fiddle::TYPE_VOIDP,  # lpGuid : GUID*
    Fiddle::TYPE_VOIDP,  # lpServiceName : LPSTR
    -Fiddle::TYPE_INT,  # dwProperties : DWORD
    Fiddle::TYPE_VOIDP,  # lpBuffer : void* out
    Fiddle::TYPE_VOIDP,  # lpdwBufferSize : DWORD* in/out
    Fiddle::TYPE_VOIDP,  # lpServiceAsyncInfo : SERVICE_ASYNC_INFO* optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "mswsock")]
extern "system" {
    fn GetServiceA(
        dwNameSpace: u32,  // DWORD
        lpGuid: *mut GUID,  // GUID*
        lpServiceName: *mut u8,  // LPSTR
        dwProperties: u32,  // DWORD
        lpBuffer: *mut (),  // void* out
        lpdwBufferSize: *mut u32,  // DWORD* in/out
        lpServiceAsyncInfo: *mut SERVICE_ASYNC_INFO  // SERVICE_ASYNC_INFO* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MSWSOCK.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern int GetServiceA(uint dwNameSpace, ref Guid lpGuid, [MarshalAs(UnmanagedType.LPStr)] string lpServiceName, uint dwProperties, IntPtr lpBuffer, ref uint lpdwBufferSize, IntPtr lpServiceAsyncInfo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MSWSOCK_GetServiceA' -Namespace Win32 -PassThru
# $api::GetServiceA(dwNameSpace, lpGuid, lpServiceName, dwProperties, lpBuffer, lpdwBufferSize, lpServiceAsyncInfo)

#uselib "MSWSOCK.dll"
#func global GetServiceA "GetServiceA" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; GetServiceA dwNameSpace, varptr(lpGuid), lpServiceName, dwProperties, lpBuffer, varptr(lpdwBufferSize), varptr(lpServiceAsyncInfo)   ; 戻り値は stat
; dwNameSpace : DWORD -> "sptr"
; lpGuid : GUID* -> "sptr"
; lpServiceName : LPSTR -> "sptr"
; dwProperties : DWORD -> "sptr"
; lpBuffer : void* out -> "sptr"
; lpdwBufferSize : DWORD* in/out -> "sptr"
; lpServiceAsyncInfo : SERVICE_ASYNC_INFO* optional -> "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 "MSWSOCK.dll"
#cfunc global GetServiceA "GetServiceA" int, var, str, int, sptr, var, var
; res = GetServiceA(dwNameSpace, lpGuid, lpServiceName, dwProperties, lpBuffer, lpdwBufferSize, lpServiceAsyncInfo)
; dwNameSpace : DWORD -> "int"
; lpGuid : GUID* -> "var"
; lpServiceName : LPSTR -> "str"
; dwProperties : DWORD -> "int"
; lpBuffer : void* out -> "sptr"
; lpdwBufferSize : DWORD* in/out -> "var"
; lpServiceAsyncInfo : SERVICE_ASYNC_INFO* optional -> "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。

; INT GetServiceA(DWORD dwNameSpace, GUID* lpGuid, LPSTR lpServiceName, DWORD dwProperties, void* lpBuffer, DWORD* lpdwBufferSize, SERVICE_ASYNC_INFO* lpServiceAsyncInfo)
#uselib "MSWSOCK.dll"
#cfunc global GetServiceA "GetServiceA" int, var, str, int, intptr, var, var
; res = GetServiceA(dwNameSpace, lpGuid, lpServiceName, dwProperties, lpBuffer, lpdwBufferSize, lpServiceAsyncInfo)
; dwNameSpace : DWORD -> "int"
; lpGuid : GUID* -> "var"
; lpServiceName : LPSTR -> "str"
; dwProperties : DWORD -> "int"
; lpBuffer : void* out -> "intptr"
; lpdwBufferSize : DWORD* in/out -> "var"
; lpServiceAsyncInfo : SERVICE_ASYNC_INFO* optional -> "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 (
	mswsock = windows.NewLazySystemDLL("MSWSOCK.dll")
	procGetServiceA = mswsock.NewProc("GetServiceA")
)

// dwNameSpace (DWORD), lpGuid (GUID*), lpServiceName (LPSTR), dwProperties (DWORD), lpBuffer (void* out), lpdwBufferSize (DWORD* in/out), lpServiceAsyncInfo (SERVICE_ASYNC_INFO* optional)
r1, _, err := procGetServiceA.Call(
	uintptr(dwNameSpace),
	uintptr(lpGuid),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpServiceName))),
	uintptr(dwProperties),
	uintptr(lpBuffer),
	uintptr(lpdwBufferSize),
	uintptr(lpServiceAsyncInfo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetServiceA(
  dwNameSpace: DWORD;   // DWORD
  lpGuid: PGUID;   // GUID*
  lpServiceName: PAnsiChar;   // LPSTR
  dwProperties: DWORD;   // DWORD
  lpBuffer: Pointer;   // void* out
  lpdwBufferSize: Pointer;   // DWORD* in/out
  lpServiceAsyncInfo: Pointer   // SERVICE_ASYNC_INFO* optional
): Integer; stdcall;
  external 'MSWSOCK.dll' name 'GetServiceA';

result := DllCall("MSWSOCK\GetServiceA"
    , "UInt", dwNameSpace   ; DWORD
    , "Ptr", lpGuid   ; GUID*
    , "AStr", lpServiceName   ; LPSTR
    , "UInt", dwProperties   ; DWORD
    , "Ptr", lpBuffer   ; void* out
    , "Ptr", lpdwBufferSize   ; DWORD* in/out
    , "Ptr", lpServiceAsyncInfo   ; SERVICE_ASYNC_INFO* optional
    , "Int")   ; return: INT

●GetServiceA(dwNameSpace, lpGuid, lpServiceName, dwProperties, lpBuffer, lpdwBufferSize, lpServiceAsyncInfo) = DLL("MSWSOCK.dll", "int GetServiceA(dword, void*, char*, dword, void*, void*, void*)")
# 呼び出し: GetServiceA(dwNameSpace, lpGuid, lpServiceName, dwProperties, lpBuffer, lpdwBufferSize, lpServiceAsyncInfo)
# dwNameSpace : DWORD -> "dword"
# lpGuid : GUID* -> "void*"
# lpServiceName : LPSTR -> "char*"
# dwProperties : DWORD -> "dword"
# lpBuffer : void* out -> "void*"
# lpdwBufferSize : DWORD* in/out -> "void*"
# lpServiceAsyncInfo : SERVICE_ASYNC_INFO* optional -> "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)。