GetFormW

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

BOOL GetFormW(
    PRINTER_HANDLE hPrinter,
    LPCWSTR pFormName,
    DWORD Level,
    BYTE* pForm,   // optional
    DWORD cbBuf,
    DWORD* pcbNeeded
);

<DllImport("winspool.drv", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function GetFormW(
    hPrinter As PRINTER_HANDLE,   ' PRINTER_HANDLE
    <MarshalAs(UnmanagedType.LPWStr)> pFormName As String,   ' LPCWSTR
    Level As UInteger,   ' DWORD
    pForm As IntPtr,   ' BYTE* optional, out
    cbBuf As UInteger,   ' DWORD
    <Out> ByRef pcbNeeded As UInteger   ' DWORD* out
) As Boolean
End Function

' hPrinter : PRINTER_HANDLE
' pFormName : LPCWSTR
' Level : DWORD
' pForm : BYTE* optional, out
' cbBuf : DWORD
' pcbNeeded : DWORD* out
Declare PtrSafe Function GetFormW Lib "winspool.drv" ( _
    ByVal hPrinter As LongPtr, _
    ByVal pFormName As LongPtr, _
    ByVal Level As Long, _
    ByVal pForm As LongPtr, _
    ByVal cbBuf As Long, _
    ByRef pcbNeeded 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

GetFormW = ctypes.windll.LoadLibrary("winspool.drv").GetFormW
GetFormW.restype = wintypes.BOOL
GetFormW.argtypes = [
    PRINTER_HANDLE,  # hPrinter : PRINTER_HANDLE
    wintypes.LPCWSTR,  # pFormName : LPCWSTR
    wintypes.DWORD,  # Level : DWORD
    ctypes.POINTER(ctypes.c_ubyte),  # pForm : BYTE* optional, out
    wintypes.DWORD,  # cbBuf : DWORD
    ctypes.POINTER(wintypes.DWORD),  # pcbNeeded : DWORD* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('winspool.drv')
GetFormW = Fiddle::Function.new(
  lib['GetFormW'],
  [
    Fiddle::TYPE_VOIDP,  # hPrinter : PRINTER_HANDLE
    Fiddle::TYPE_VOIDP,  # pFormName : LPCWSTR
    -Fiddle::TYPE_INT,  # Level : DWORD
    Fiddle::TYPE_VOIDP,  # pForm : BYTE* optional, out
    -Fiddle::TYPE_INT,  # cbBuf : DWORD
    Fiddle::TYPE_VOIDP,  # pcbNeeded : DWORD* out
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winspool.drv")]
extern "system" {
    fn GetFormW(
        hPrinter: PRINTER_HANDLE,  // PRINTER_HANDLE
        pFormName: *const u16,  // LPCWSTR
        Level: u32,  // DWORD
        pForm: *mut u8,  // BYTE* optional, out
        cbBuf: u32,  // DWORD
        pcbNeeded: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("winspool.drv", CharSet = CharSet.Unicode)]
public static extern bool GetFormW(PRINTER_HANDLE hPrinter, [MarshalAs(UnmanagedType.LPWStr)] string pFormName, uint Level, IntPtr pForm, uint cbBuf, out uint pcbNeeded);
"@
$api = Add-Type -MemberDefinition $sig -Name 'winspool.drv_GetFormW' -Namespace Win32 -PassThru
# $api::GetFormW(hPrinter, pFormName, Level, pForm, cbBuf, pcbNeeded)

#uselib "winspool.drv"
#func global GetFormW "GetFormW" wptr, wptr, wptr, wptr, wptr, wptr
; GetFormW hPrinter, pFormName, Level, varptr(pForm), cbBuf, varptr(pcbNeeded)   ; 戻り値は stat
; hPrinter : PRINTER_HANDLE -> "wptr"
; pFormName : LPCWSTR -> "wptr"
; Level : DWORD -> "wptr"
; pForm : BYTE* optional, out -> "wptr"
; cbBuf : DWORD -> "wptr"
; pcbNeeded : 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 GetFormW "GetFormW" int, wstr, int, var, int, var
; res = GetFormW(hPrinter, pFormName, Level, pForm, cbBuf, pcbNeeded)
; hPrinter : PRINTER_HANDLE -> "int"
; pFormName : LPCWSTR -> "wstr"
; Level : DWORD -> "int"
; pForm : BYTE* optional, out -> "var"
; cbBuf : DWORD -> "int"
; pcbNeeded : 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。

; BOOL GetFormW(PRINTER_HANDLE hPrinter, LPCWSTR pFormName, DWORD Level, BYTE* pForm, DWORD cbBuf, DWORD* pcbNeeded)
#uselib "winspool.drv"
#cfunc global GetFormW "GetFormW" int, wstr, int, var, int, var
; res = GetFormW(hPrinter, pFormName, Level, pForm, cbBuf, pcbNeeded)
; hPrinter : PRINTER_HANDLE -> "int"
; pFormName : LPCWSTR -> "wstr"
; Level : DWORD -> "int"
; pForm : BYTE* optional, out -> "var"
; cbBuf : DWORD -> "int"
; pcbNeeded : 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")
	procGetFormW = winspool_drv.NewProc("GetFormW")
)

// hPrinter (PRINTER_HANDLE), pFormName (LPCWSTR), Level (DWORD), pForm (BYTE* optional, out), cbBuf (DWORD), pcbNeeded (DWORD* out)
r1, _, err := procGetFormW.Call(
	uintptr(hPrinter),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pFormName))),
	uintptr(Level),
	uintptr(pForm),
	uintptr(cbBuf),
	uintptr(pcbNeeded),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetFormW(
  hPrinter: PRINTER_HANDLE;   // PRINTER_HANDLE
  pFormName: PWideChar;   // LPCWSTR
  Level: DWORD;   // DWORD
  pForm: Pointer;   // BYTE* optional, out
  cbBuf: DWORD;   // DWORD
  pcbNeeded: Pointer   // DWORD* out
): BOOL; stdcall;
  external 'winspool.drv' name 'GetFormW';

result := DllCall("winspool.drv\GetFormW"
    , "Ptr", hPrinter   ; PRINTER_HANDLE
    , "WStr", pFormName   ; LPCWSTR
    , "UInt", Level   ; DWORD
    , "Ptr", pForm   ; BYTE* optional, out
    , "UInt", cbBuf   ; DWORD
    , "Ptr", pcbNeeded   ; DWORD* out
    , "Int")   ; return: BOOL

●GetFormW(hPrinter, pFormName, Level, pForm, cbBuf, pcbNeeded) = DLL("winspool.drv", "bool GetFormW(void*, char*, dword, void*, dword, void*)")
# 呼び出し: GetFormW(hPrinter, pFormName, Level, pForm, cbBuf, pcbNeeded)
# hPrinter : PRINTER_HANDLE -> "void*"
# pFormName : LPCWSTR -> "char*"
# Level : DWORD -> "dword"
# pForm : BYTE* optional, out -> "void*"
# cbBuf : DWORD -> "dword"
# pcbNeeded : 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。