CreateDesktopW

// USER32.dll  (Unicode / -W)
#include <windows.h>

HDESK CreateDesktopW(
    LPCWSTR lpszDesktop,
    LPCWSTR lpszDevice,   // optional
    DEVMODEW* pDevmode,   // optional
    DESKTOP_CONTROL_FLAGS dwFlags,
    DWORD dwDesiredAccess,
    SECURITY_ATTRIBUTES* lpsa   // optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Unicode, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CreateDesktopW(
    <MarshalAs(UnmanagedType.LPWStr)> lpszDesktop As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> lpszDevice As String,   ' LPCWSTR optional
    pDevmode As IntPtr,   ' DEVMODEW* optional
    dwFlags As UInteger,   ' DESKTOP_CONTROL_FLAGS
    dwDesiredAccess As UInteger,   ' DWORD
    lpsa As IntPtr   ' SECURITY_ATTRIBUTES* optional
) As IntPtr
End Function

' lpszDesktop : LPCWSTR
' lpszDevice : LPCWSTR optional
' pDevmode : DEVMODEW* optional
' dwFlags : DESKTOP_CONTROL_FLAGS
' dwDesiredAccess : DWORD
' lpsa : SECURITY_ATTRIBUTES* optional
Declare PtrSafe Function CreateDesktopW Lib "user32" ( _
    ByVal lpszDesktop As LongPtr, _
    ByVal lpszDevice As LongPtr, _
    ByVal pDevmode As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal dwDesiredAccess As Long, _
    ByVal lpsa As LongPtr) As LongPtr
' 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

CreateDesktopW = ctypes.windll.user32.CreateDesktopW
CreateDesktopW.restype = ctypes.c_void_p
CreateDesktopW.argtypes = [
    wintypes.LPCWSTR,  # lpszDesktop : LPCWSTR
    wintypes.LPCWSTR,  # lpszDevice : LPCWSTR optional
    ctypes.c_void_p,  # pDevmode : DEVMODEW* optional
    wintypes.DWORD,  # dwFlags : DESKTOP_CONTROL_FLAGS
    wintypes.DWORD,  # dwDesiredAccess : DWORD
    ctypes.c_void_p,  # lpsa : SECURITY_ATTRIBUTES* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CreateDesktopW = Fiddle::Function.new(
  lib['CreateDesktopW'],
  [
    Fiddle::TYPE_VOIDP,  # lpszDesktop : LPCWSTR
    Fiddle::TYPE_VOIDP,  # lpszDevice : LPCWSTR optional
    Fiddle::TYPE_VOIDP,  # pDevmode : DEVMODEW* optional
    -Fiddle::TYPE_INT,  # dwFlags : DESKTOP_CONTROL_FLAGS
    -Fiddle::TYPE_INT,  # dwDesiredAccess : DWORD
    Fiddle::TYPE_VOIDP,  # lpsa : SECURITY_ATTRIBUTES* optional
  ],
  Fiddle::TYPE_VOIDP)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "user32")]
extern "system" {
    fn CreateDesktopW(
        lpszDesktop: *const u16,  // LPCWSTR
        lpszDevice: *const u16,  // LPCWSTR optional
        pDevmode: *mut DEVMODEW,  // DEVMODEW* optional
        dwFlags: u32,  // DESKTOP_CONTROL_FLAGS
        dwDesiredAccess: u32,  // DWORD
        lpsa: *mut SECURITY_ATTRIBUTES  // SECURITY_ATTRIBUTES* optional
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern IntPtr CreateDesktopW([MarshalAs(UnmanagedType.LPWStr)] string lpszDesktop, [MarshalAs(UnmanagedType.LPWStr)] string lpszDevice, IntPtr pDevmode, uint dwFlags, uint dwDesiredAccess, IntPtr lpsa);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CreateDesktopW' -Namespace Win32 -PassThru
# $api::CreateDesktopW(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)

#uselib "USER32.dll"
#func global CreateDesktopW "CreateDesktopW" wptr, wptr, wptr, wptr, wptr, wptr
; CreateDesktopW lpszDesktop, lpszDevice, varptr(pDevmode), dwFlags, dwDesiredAccess, varptr(lpsa)   ; 戻り値は stat
; lpszDesktop : LPCWSTR -> "wptr"
; lpszDevice : LPCWSTR optional -> "wptr"
; pDevmode : DEVMODEW* optional -> "wptr"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "wptr"
; dwDesiredAccess : DWORD -> "wptr"
; lpsa : SECURITY_ATTRIBUTES* 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 "USER32.dll"
#cfunc global CreateDesktopW "CreateDesktopW" wstr, wstr, var, int, int, var
; res = CreateDesktopW(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)
; lpszDesktop : LPCWSTR -> "wstr"
; lpszDevice : LPCWSTR optional -> "wstr"
; pDevmode : DEVMODEW* optional -> "var"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "int"
; dwDesiredAccess : DWORD -> "int"
; lpsa : SECURITY_ATTRIBUTES* 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。

; HDESK CreateDesktopW(LPCWSTR lpszDesktop, LPCWSTR lpszDevice, DEVMODEW* pDevmode, DESKTOP_CONTROL_FLAGS dwFlags, DWORD dwDesiredAccess, SECURITY_ATTRIBUTES* lpsa)
#uselib "USER32.dll"
#cfunc global CreateDesktopW "CreateDesktopW" wstr, wstr, var, int, int, var
; res = CreateDesktopW(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)
; lpszDesktop : LPCWSTR -> "wstr"
; lpszDevice : LPCWSTR optional -> "wstr"
; pDevmode : DEVMODEW* optional -> "var"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "int"
; dwDesiredAccess : DWORD -> "int"
; lpsa : SECURITY_ATTRIBUTES* 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 (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCreateDesktopW = user32.NewProc("CreateDesktopW")
)

// lpszDesktop (LPCWSTR), lpszDevice (LPCWSTR optional), pDevmode (DEVMODEW* optional), dwFlags (DESKTOP_CONTROL_FLAGS), dwDesiredAccess (DWORD), lpsa (SECURITY_ATTRIBUTES* optional)
r1, _, err := procCreateDesktopW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszDesktop))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpszDevice))),
	uintptr(pDevmode),
	uintptr(dwFlags),
	uintptr(dwDesiredAccess),
	uintptr(lpsa),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HDESK

function CreateDesktopW(
  lpszDesktop: PWideChar;   // LPCWSTR
  lpszDevice: PWideChar;   // LPCWSTR optional
  pDevmode: Pointer;   // DEVMODEW* optional
  dwFlags: DWORD;   // DESKTOP_CONTROL_FLAGS
  dwDesiredAccess: DWORD;   // DWORD
  lpsa: Pointer   // SECURITY_ATTRIBUTES* optional
): THandle; stdcall;
  external 'USER32.dll' name 'CreateDesktopW';

result := DllCall("USER32\CreateDesktopW"
    , "WStr", lpszDesktop   ; LPCWSTR
    , "WStr", lpszDevice   ; LPCWSTR optional
    , "Ptr", pDevmode   ; DEVMODEW* optional
    , "UInt", dwFlags   ; DESKTOP_CONTROL_FLAGS
    , "UInt", dwDesiredAccess   ; DWORD
    , "Ptr", lpsa   ; SECURITY_ATTRIBUTES* optional
    , "Ptr")   ; return: HDESK

●CreateDesktopW(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa) = DLL("USER32.dll", "void* CreateDesktopW(char*, char*, void*, dword, dword, void*)")
# 呼び出し: CreateDesktopW(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)
# lpszDesktop : LPCWSTR -> "char*"
# lpszDevice : LPCWSTR optional -> "char*"
# pDevmode : DEVMODEW* optional -> "void*"
# dwFlags : DESKTOP_CONTROL_FLAGS -> "dword"
# dwDesiredAccess : DWORD -> "dword"
# lpsa : SECURITY_ATTRIBUTES* 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。