OpenPrinterW

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

BOOL OpenPrinterW(
    LPCWSTR pPrinterName,   // optional
    PRINTER_HANDLE* phPrinter,
    PRINTER_DEFAULTSW* pDefault   // optional
);

<DllImport("winspool.drv", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function OpenPrinterW(
    <MarshalAs(UnmanagedType.LPWStr)> pPrinterName As String,   ' LPCWSTR optional
    phPrinter As IntPtr,   ' PRINTER_HANDLE* out
    pDefault As IntPtr   ' PRINTER_DEFAULTSW* optional
) As Boolean
End Function

' pPrinterName : LPCWSTR optional
' phPrinter : PRINTER_HANDLE* out
' pDefault : PRINTER_DEFAULTSW* optional
Declare PtrSafe Function OpenPrinterW Lib "winspool.drv" ( _
    ByVal pPrinterName As LongPtr, _
    ByVal phPrinter As LongPtr, _
    ByVal pDefault As LongPtr) 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

OpenPrinterW = ctypes.windll.LoadLibrary("winspool.drv").OpenPrinterW
OpenPrinterW.restype = wintypes.BOOL
OpenPrinterW.argtypes = [
    wintypes.LPCWSTR,  # pPrinterName : LPCWSTR optional
    ctypes.c_void_p,  # phPrinter : PRINTER_HANDLE* out
    ctypes.c_void_p,  # pDefault : PRINTER_DEFAULTSW* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('winspool.drv')
OpenPrinterW = Fiddle::Function.new(
  lib['OpenPrinterW'],
  [
    Fiddle::TYPE_VOIDP,  # pPrinterName : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # phPrinter : PRINTER_HANDLE* out
    Fiddle::TYPE_VOIDP,  # pDefault : PRINTER_DEFAULTSW* optional
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winspool.drv")]
extern "system" {
    fn OpenPrinterW(
        pPrinterName: *const u16,  // LPCWSTR optional
        phPrinter: *mut PRINTER_HANDLE,  // PRINTER_HANDLE* out
        pDefault: *mut PRINTER_DEFAULTSW  // PRINTER_DEFAULTSW* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("winspool.drv", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool OpenPrinterW([MarshalAs(UnmanagedType.LPWStr)] string pPrinterName, IntPtr phPrinter, IntPtr pDefault);
"@
$api = Add-Type -MemberDefinition $sig -Name 'winspool.drv_OpenPrinterW' -Namespace Win32 -PassThru
# $api::OpenPrinterW(pPrinterName, phPrinter, pDefault)

#uselib "winspool.drv"
#func global OpenPrinterW "OpenPrinterW" wptr, wptr, wptr
; OpenPrinterW pPrinterName, varptr(phPrinter), varptr(pDefault)   ; 戻り値は stat
; pPrinterName : LPCWSTR optional -> "wptr"
; phPrinter : PRINTER_HANDLE* out -> "wptr"
; pDefault : PRINTER_DEFAULTSW* optional -> "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 "winspool.drv"
#cfunc global OpenPrinterW "OpenPrinterW" wstr, var, var
; res = OpenPrinterW(pPrinterName, phPrinter, pDefault)
; pPrinterName : LPCWSTR optional -> "wstr"
; phPrinter : PRINTER_HANDLE* out -> "var"
; pDefault : PRINTER_DEFAULTSW* 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。

; BOOL OpenPrinterW(LPCWSTR pPrinterName, PRINTER_HANDLE* phPrinter, PRINTER_DEFAULTSW* pDefault)
#uselib "winspool.drv"
#cfunc global OpenPrinterW "OpenPrinterW" wstr, var, var
; res = OpenPrinterW(pPrinterName, phPrinter, pDefault)
; pPrinterName : LPCWSTR optional -> "wstr"
; phPrinter : PRINTER_HANDLE* out -> "var"
; pDefault : PRINTER_DEFAULTSW* 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 (
	winspool_drv = windows.NewLazySystemDLL("winspool.drv")
	procOpenPrinterW = winspool_drv.NewProc("OpenPrinterW")
)

// pPrinterName (LPCWSTR optional), phPrinter (PRINTER_HANDLE* out), pDefault (PRINTER_DEFAULTSW* optional)
r1, _, err := procOpenPrinterW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pPrinterName))),
	uintptr(phPrinter),
	uintptr(pDefault),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function OpenPrinterW(
  pPrinterName: PWideChar;   // LPCWSTR optional
  phPrinter: Pointer;   // PRINTER_HANDLE* out
  pDefault: Pointer   // PRINTER_DEFAULTSW* optional
): BOOL; stdcall;
  external 'winspool.drv' name 'OpenPrinterW';

result := DllCall("winspool.drv\OpenPrinterW"
    , "WStr", pPrinterName   ; LPCWSTR optional
    , "Ptr", phPrinter   ; PRINTER_HANDLE* out
    , "Ptr", pDefault   ; PRINTER_DEFAULTSW* optional
    , "Int")   ; return: BOOL

●OpenPrinterW(pPrinterName, phPrinter, pDefault) = DLL("winspool.drv", "bool OpenPrinterW(char*, void*, void*)")
# 呼び出し: OpenPrinterW(pPrinterName, phPrinter, pDefault)
# pPrinterName : LPCWSTR optional -> "char*"
# phPrinter : PRINTER_HANDLE* out -> "void*"
# pDefault : PRINTER_DEFAULTSW* 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。