EnumPrinterKeyA

// winspool.drv  (ANSI / -A)
#include <windows.h>

DWORD EnumPrinterKeyA(
    PRINTER_HANDLE hPrinter,
    LPCSTR pKeyName,
    LPSTR pSubkey,   // optional
    DWORD cbSubkey,
    DWORD* pcbSubkey
);

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

' hPrinter : PRINTER_HANDLE
' pKeyName : LPCSTR
' pSubkey : LPSTR optional, out
' cbSubkey : DWORD
' pcbSubkey : DWORD* out
Declare PtrSafe Function EnumPrinterKeyA Lib "winspool.drv" ( _
    ByVal hPrinter As LongPtr, _
    ByVal pKeyName As String, _
    ByVal pSubkey As String, _
    ByVal cbSubkey As Long, _
    ByRef pcbSubkey As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

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

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('winspool.drv')
EnumPrinterKeyA = Fiddle::Function.new(
  lib['EnumPrinterKeyA'],
  [
    Fiddle::TYPE_VOIDP,  # hPrinter : PRINTER_HANDLE
    Fiddle::TYPE_VOIDP,  # pKeyName : LPCSTR
    Fiddle::TYPE_VOIDP,  # pSubkey : LPSTR optional, out
    -Fiddle::TYPE_INT,  # cbSubkey : DWORD
    Fiddle::TYPE_VOIDP,  # pcbSubkey : DWORD* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "winspool.drv")]
extern "system" {
    fn EnumPrinterKeyA(
        hPrinter: PRINTER_HANDLE,  // PRINTER_HANDLE
        pKeyName: *const u8,  // LPCSTR
        pSubkey: *mut u8,  // LPSTR 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.Ansi)]
public static extern uint EnumPrinterKeyA(PRINTER_HANDLE hPrinter, [MarshalAs(UnmanagedType.LPStr)] string pKeyName, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pSubkey, uint cbSubkey, out uint pcbSubkey);
"@
$api = Add-Type -MemberDefinition $sig -Name 'winspool.drv_EnumPrinterKeyA' -Namespace Win32 -PassThru
# $api::EnumPrinterKeyA(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)

#uselib "winspool.drv"
#func global EnumPrinterKeyA "EnumPrinterKeyA" sptr, sptr, sptr, sptr, sptr
; EnumPrinterKeyA hPrinter, pKeyName, varptr(pSubkey), cbSubkey, varptr(pcbSubkey)   ; 戻り値は stat
; hPrinter : PRINTER_HANDLE -> "sptr"
; pKeyName : LPCSTR -> "sptr"
; pSubkey : LPSTR optional, out -> "sptr"
; cbSubkey : DWORD -> "sptr"
; pcbSubkey : DWORD* out -> "sptr"
; ※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 EnumPrinterKeyA "EnumPrinterKeyA" int, str, var, int, var
; res = EnumPrinterKeyA(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)
; hPrinter : PRINTER_HANDLE -> "int"
; pKeyName : LPCSTR -> "str"
; pSubkey : LPSTR 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 EnumPrinterKeyA(PRINTER_HANDLE hPrinter, LPCSTR pKeyName, LPSTR pSubkey, DWORD cbSubkey, DWORD* pcbSubkey)
#uselib "winspool.drv"
#cfunc global EnumPrinterKeyA "EnumPrinterKeyA" int, str, var, int, var
; res = EnumPrinterKeyA(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)
; hPrinter : PRINTER_HANDLE -> "int"
; pKeyName : LPCSTR -> "str"
; pSubkey : LPSTR 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")
	procEnumPrinterKeyA = winspool_drv.NewProc("EnumPrinterKeyA")
)

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

function EnumPrinterKeyA(
  hPrinter: PRINTER_HANDLE;   // PRINTER_HANDLE
  pKeyName: PAnsiChar;   // LPCSTR
  pSubkey: PAnsiChar;   // LPSTR optional, out
  cbSubkey: DWORD;   // DWORD
  pcbSubkey: Pointer   // DWORD* out
): DWORD; stdcall;
  external 'winspool.drv' name 'EnumPrinterKeyA';

result := DllCall("winspool.drv\EnumPrinterKeyA"
    , "Ptr", hPrinter   ; PRINTER_HANDLE
    , "AStr", pKeyName   ; LPCSTR
    , "Ptr", pSubkey   ; LPSTR optional, out
    , "UInt", cbSubkey   ; DWORD
    , "Ptr", pcbSubkey   ; DWORD* out
    , "UInt")   ; return: DWORD

●EnumPrinterKeyA(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey) = DLL("winspool.drv", "dword EnumPrinterKeyA(void*, char*, char*, dword, void*)")
# 呼び出し: EnumPrinterKeyA(hPrinter, pKeyName, pSubkey, cbSubkey, pcbSubkey)
# hPrinter : PRINTER_HANDLE -> "void*"
# pKeyName : LPCSTR -> "char*"
# pSubkey : LPSTR 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)。