WSAGetServiceClassNameByClassIdW

// WS2_32.dll  (Unicode / -W)
#include <windows.h>

INT WSAGetServiceClassNameByClassIdW(
    GUID* lpServiceClassId,
    LPWSTR lpszServiceClassName,
    DWORD* lpdwBufferLength
);

<DllImport("WS2_32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WSAGetServiceClassNameByClassIdW(
    ByRef lpServiceClassId As Guid,   ' GUID*
    <MarshalAs(UnmanagedType.LPWStr)> lpszServiceClassName As System.Text.StringBuilder,   ' LPWSTR out
    ByRef lpdwBufferLength As UInteger   ' DWORD* in/out
) As Integer
End Function

' lpServiceClassId : GUID*
' lpszServiceClassName : LPWSTR out
' lpdwBufferLength : DWORD* in/out
Declare PtrSafe Function WSAGetServiceClassNameByClassIdW Lib "ws2_32" ( _
    ByVal lpServiceClassId As LongPtr, _
    ByVal lpszServiceClassName As LongPtr, _
    ByRef lpdwBufferLength 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

WSAGetServiceClassNameByClassIdW = ctypes.windll.ws2_32.WSAGetServiceClassNameByClassIdW
WSAGetServiceClassNameByClassIdW.restype = ctypes.c_int
WSAGetServiceClassNameByClassIdW.argtypes = [
    ctypes.c_void_p,  # lpServiceClassId : GUID*
    wintypes.LPWSTR,  # lpszServiceClassName : LPWSTR out
    ctypes.POINTER(wintypes.DWORD),  # lpdwBufferLength : DWORD* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WS2_32.dll')
WSAGetServiceClassNameByClassIdW = Fiddle::Function.new(
  lib['WSAGetServiceClassNameByClassIdW'],
  [
    Fiddle::TYPE_VOIDP,  # lpServiceClassId : GUID*
    Fiddle::TYPE_VOIDP,  # lpszServiceClassName : LPWSTR out
    Fiddle::TYPE_VOIDP,  # lpdwBufferLength : DWORD* in/out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "ws2_32")]
extern "system" {
    fn WSAGetServiceClassNameByClassIdW(
        lpServiceClassId: *mut GUID,  // GUID*
        lpszServiceClassName: *mut u16,  // LPWSTR out
        lpdwBufferLength: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("WS2_32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern int WSAGetServiceClassNameByClassIdW(ref Guid lpServiceClassId, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder lpszServiceClassName, ref uint lpdwBufferLength);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WS2_32_WSAGetServiceClassNameByClassIdW' -Namespace Win32 -PassThru
# $api::WSAGetServiceClassNameByClassIdW(lpServiceClassId, lpszServiceClassName, lpdwBufferLength)

#uselib "WS2_32.dll"
#func global WSAGetServiceClassNameByClassIdW "WSAGetServiceClassNameByClassIdW" wptr, wptr, wptr
; WSAGetServiceClassNameByClassIdW varptr(lpServiceClassId), varptr(lpszServiceClassName), varptr(lpdwBufferLength)   ; 戻り値は stat
; lpServiceClassId : GUID* -> "wptr"
; lpszServiceClassName : LPWSTR out -> "wptr"
; lpdwBufferLength : 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 "WS2_32.dll"
#cfunc global WSAGetServiceClassNameByClassIdW "WSAGetServiceClassNameByClassIdW" var, var, var
; res = WSAGetServiceClassNameByClassIdW(lpServiceClassId, lpszServiceClassName, lpdwBufferLength)
; lpServiceClassId : GUID* -> "var"
; lpszServiceClassName : LPWSTR out -> "var"
; lpdwBufferLength : 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。

; INT WSAGetServiceClassNameByClassIdW(GUID* lpServiceClassId, LPWSTR lpszServiceClassName, DWORD* lpdwBufferLength)
#uselib "WS2_32.dll"
#cfunc global WSAGetServiceClassNameByClassIdW "WSAGetServiceClassNameByClassIdW" var, var, var
; res = WSAGetServiceClassNameByClassIdW(lpServiceClassId, lpszServiceClassName, lpdwBufferLength)
; lpServiceClassId : GUID* -> "var"
; lpszServiceClassName : LPWSTR out -> "var"
; lpdwBufferLength : 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 (
	ws2_32 = windows.NewLazySystemDLL("WS2_32.dll")
	procWSAGetServiceClassNameByClassIdW = ws2_32.NewProc("WSAGetServiceClassNameByClassIdW")
)

// lpServiceClassId (GUID*), lpszServiceClassName (LPWSTR out), lpdwBufferLength (DWORD* in/out)
r1, _, err := procWSAGetServiceClassNameByClassIdW.Call(
	uintptr(lpServiceClassId),
	uintptr(lpszServiceClassName),
	uintptr(lpdwBufferLength),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function WSAGetServiceClassNameByClassIdW(
  lpServiceClassId: PGUID;   // GUID*
  lpszServiceClassName: PWideChar;   // LPWSTR out
  lpdwBufferLength: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'WS2_32.dll' name 'WSAGetServiceClassNameByClassIdW';

result := DllCall("WS2_32\WSAGetServiceClassNameByClassIdW"
    , "Ptr", lpServiceClassId   ; GUID*
    , "Ptr", lpszServiceClassName   ; LPWSTR out
    , "Ptr", lpdwBufferLength   ; DWORD* in/out
    , "Int")   ; return: INT

●WSAGetServiceClassNameByClassIdW(lpServiceClassId, lpszServiceClassName, lpdwBufferLength) = DLL("WS2_32.dll", "int WSAGetServiceClassNameByClassIdW(void*, char*, void*)")
# 呼び出し: WSAGetServiceClassNameByClassIdW(lpServiceClassId, lpszServiceClassName, lpdwBufferLength)
# lpServiceClassId : GUID* -> "void*"
# lpszServiceClassName : LPWSTR out -> "char*"
# lpdwBufferLength : 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。