EnumPrinterKeyW

// winspool.drv  (Unicode / -W)
#include <windows.h>

DWORD EnumPrinterKeyW(
    PRINTER_HANDLE hPrinter,
    LPCWSTR pKeyName,
    LPWSTR pSubkey,   // optional
    DWORD cbSubkey,
    DWORD* pcbSubkey
);

<DllImport("winspool.drv", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function EnumPrinterKeyW(
    hPrinter As PRINTER_HANDLE,   ' PRINTER_HANDLE
    <MarshalAs(UnmanagedType.LPWStr)> pKeyName As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> pSubkey As System.Text.StringBuilder,   ' LPWSTR optional, out
    cbSubkey As UInteger,   ' DWORD
    <Out> ByRef pcbSubkey As UInteger   ' DWORD* out
) As UInteger
End Function

' hPrinter : PRINTER_HANDLE
' pKeyName : LPCWSTR
' pSubkey : LPWSTR optional, out
' cbSubkey : DWORD
' pcbSubkey : DWORD* out
Declare PtrSafe Function EnumPrinterKeyW Lib "winspool.drv" ( _
    ByVal hPrinter As LongPtr, _
    ByVal pKeyName As LongPtr, _
    ByVal pSubkey As LongPtr, _
    ByVal cbSubkey As Long, _
    ByRef pcbSubkey 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

EnumPrinterKeyW = ctypes.windll.LoadLibrary("winspool.drv").EnumPrinterKeyW
EnumPrinterKeyW.restype = wintypes.DWORD
EnumPrinterKeyW.argtypes = [
    PRINTER_HANDLE,  # hPrinter : PRINTER_HANDLE
    wintypes.LPCWSTR,  # pKeyName : LPCWSTR
    wintypes.LPWSTR,  # pSubkey : LPWSTR optional, out
    wintypes.DWORD,  # cbSubkey : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbSubkey : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('winspool.drv')
EnumPrinterKeyW = Fiddle::Function.new(
  lib['EnumPrinterKeyW'],
  [
    Fiddle::TYPE_VOIDP,  # hPrinter : PRINTER_HANDLE
    Fiddle::TYPE_VOIDP,  # pKeyName : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pSubkey : LPWSTR optional, out
    -Fiddle::TYPE_INT,  # cbSubkey : DWORD
    Fiddle::TYPE_VOIDP,  # pcbSubkey : DWORD* out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winspool.drv")]
extern "system" {
    fn EnumPrinterKeyW(
        hPrinter: PRINTER_HANDLE,  // PRINTER_HANDLE
        pKeyName: *const u16,  // LPCWSTR
        pSubkey: *mut u16,  // LPWSTR optional, out
        cbSubkey: u32,  // DWORD
        pcbSubkey: *mut u32  // DWORD* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("winspool.drv", CharSet = CharSet.Unicode)]
public static extern uint EnumPrinterKeyW(PRINTER_HANDLE hPrinter, [MarshalAs(UnmanagedType.LPWStr)] string pKeyName, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pSubkey, uint cbSubkey, out uint pcbSubkey);
"@
$api = Add-Type -MemberDefinition $sig -Name 'winspool.drv_EnumPrinterKeyW' -Namespace Win32 -PassThru
# $api::EnumPrinterKeyW(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)

#uselib "winspool.drv"
#func global EnumPrinterKeyW "EnumPrinterKeyW" wptr, wptr, wptr, wptr, wptr
; EnumPrinterKeyW hPrinter, pKeyName, varptr(pSubkey), cbSubkey, varptr(pcbSubkey)   ; 戻り値は stat
; hPrinter : PRINTER_HANDLE -> "wptr"
; pKeyName : LPCWSTR -> "wptr"
; pSubkey : LPWSTR optional, out -> "wptr"
; cbSubkey : DWORD -> "wptr"
; pcbSubkey : DWORD* out -> "wptr"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 "winspool.drv"
#cfunc global EnumPrinterKeyW "EnumPrinterKeyW" int, wstr, var, int, var
; res = EnumPrinterKeyW(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)
; hPrinter : PRINTER_HANDLE -> "int"
; pKeyName : LPCWSTR -> "wstr"
; pSubkey : LPWSTR optional, out -> "var"
; cbSubkey : DWORD -> "int"
; pcbSubkey : DWORD* out -> "var"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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。

; DWORD EnumPrinterKeyW(PRINTER_HANDLE hPrinter, LPCWSTR pKeyName, LPWSTR pSubkey, DWORD cbSubkey, DWORD* pcbSubkey)
#uselib "winspool.drv"
#cfunc global EnumPrinterKeyW "EnumPrinterKeyW" int, wstr, var, int, var
; res = EnumPrinterKeyW(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)
; hPrinter : PRINTER_HANDLE -> "int"
; pKeyName : LPCWSTR -> "wstr"
; pSubkey : LPWSTR optional, out -> "var"
; cbSubkey : DWORD -> "int"
; pcbSubkey : DWORD* out -> "var"
; ※値渡し構造体は直接渡せません。intにパック、または var で構造体変数を渡してください。
; ※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 (
	winspool_drv = windows.NewLazySystemDLL("winspool.drv")
	procEnumPrinterKeyW = winspool_drv.NewProc("EnumPrinterKeyW")
)

// hPrinter (PRINTER_HANDLE), pKeyName (LPCWSTR), pSubkey (LPWSTR optional, out), cbSubkey (DWORD), pcbSubkey (DWORD* out)
r1, _, err := procEnumPrinterKeyW.Call(
	uintptr(hPrinter),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pKeyName))),
	uintptr(pSubkey),
	uintptr(cbSubkey),
	uintptr(pcbSubkey),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function EnumPrinterKeyW(
  hPrinter: PRINTER_HANDLE;   // PRINTER_HANDLE
  pKeyName: PWideChar;   // LPCWSTR
  pSubkey: PWideChar;   // LPWSTR optional, out
  cbSubkey: DWORD;   // DWORD
  pcbSubkey: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'winspool.drv' name 'EnumPrinterKeyW';

result := DllCall("winspool.drv\EnumPrinterKeyW"
    , "Ptr", hPrinter   ; PRINTER_HANDLE
    , "WStr", pKeyName   ; LPCWSTR
    , "Ptr", pSubkey   ; LPWSTR optional, out
    , "UInt", cbSubkey   ; DWORD
    , "Ptr", pcbSubkey   ; DWORD* out
    , "UInt")   ; return: DWORD

●EnumPrinterKeyW(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey) = DLL("winspool.drv", "dword EnumPrinterKeyW(void*, char*, char*, dword, void*)")
# 呼び出し: EnumPrinterKeyW(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)
# hPrinter : PRINTER_HANDLE -> "void*"
# pKeyName : LPCWSTR -> "char*"
# pSubkey : LPWSTR optional, out -> "char*"
# cbSubkey : DWORD -> "dword"
# pcbSubkey : DWORD* 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。