CreateDesktopA

// USER32.dll  (ANSI / -A)
#include <windows.h>

HDESK CreateDesktopA(
    LPCSTR lpszDesktop,
    LPCSTR lpszDevice,   // optional
    DEVMODEA* pDevmode,   // optional
    DESKTOP_CONTROL_FLAGS dwFlags,
    DWORD dwDesiredAccess,
    SECURITY_ATTRIBUTES* lpsa   // optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CreateDesktopA(
    <MarshalAs(UnmanagedType.LPStr)> lpszDesktop As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> lpszDevice As String,   ' LPCSTR optional
    pDevmode As IntPtr,   ' DEVMODEA* optional
    dwFlags As UInteger,   ' DESKTOP_CONTROL_FLAGS
    dwDesiredAccess As UInteger,   ' DWORD
    lpsa As IntPtr   ' SECURITY_ATTRIBUTES* optional
) As IntPtr
End Function

' lpszDesktop : LPCSTR
' lpszDevice : LPCSTR optional
' pDevmode : DEVMODEA* optional
' dwFlags : DESKTOP_CONTROL_FLAGS
' dwDesiredAccess : DWORD
' lpsa : SECURITY_ATTRIBUTES* optional
Declare PtrSafe Function CreateDesktopA Lib "user32" ( _
    ByVal lpszDesktop As String, _
    ByVal lpszDevice As String, _
    ByVal pDevmode As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal dwDesiredAccess As Long, _
    ByVal lpsa As LongPtr) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CreateDesktopA = ctypes.windll.user32.CreateDesktopA
CreateDesktopA.restype = ctypes.c_void_p
CreateDesktopA.argtypes = [
    wintypes.LPCSTR,  # lpszDesktop : LPCSTR
    wintypes.LPCSTR,  # lpszDevice : LPCSTR optional
    ctypes.c_void_p,  # pDevmode : DEVMODEA* 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')
CreateDesktopA = Fiddle::Function.new(
  lib['CreateDesktopA'],
  [
    Fiddle::TYPE_VOIDP,  # lpszDesktop : LPCSTR
    Fiddle::TYPE_VOIDP,  # lpszDevice : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # pDevmode : DEVMODEA* optional
    -Fiddle::TYPE_INT,  # dwFlags : DESKTOP_CONTROL_FLAGS
    -Fiddle::TYPE_INT,  # dwDesiredAccess : DWORD
    Fiddle::TYPE_VOIDP,  # lpsa : SECURITY_ATTRIBUTES* optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn CreateDesktopA(
        lpszDesktop: *const u8,  // LPCSTR
        lpszDevice: *const u8,  // LPCSTR optional
        pDevmode: *mut DEVMODEA,  // DEVMODEA* 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.Ansi, SetLastError = true)]
public static extern IntPtr CreateDesktopA([MarshalAs(UnmanagedType.LPStr)] string lpszDesktop, [MarshalAs(UnmanagedType.LPStr)] string lpszDevice, IntPtr pDevmode, uint dwFlags, uint dwDesiredAccess, IntPtr lpsa);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CreateDesktopA' -Namespace Win32 -PassThru
# $api::CreateDesktopA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)

#uselib "USER32.dll"
#func global CreateDesktopA "CreateDesktopA" sptr, sptr, sptr, sptr, sptr, sptr
; CreateDesktopA lpszDesktop, lpszDevice, varptr(pDevmode), dwFlags, dwDesiredAccess, varptr(lpsa)   ; 戻り値は stat
; lpszDesktop : LPCSTR -> "sptr"
; lpszDevice : LPCSTR optional -> "sptr"
; pDevmode : DEVMODEA* optional -> "sptr"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "sptr"
; dwDesiredAccess : DWORD -> "sptr"
; lpsa : SECURITY_ATTRIBUTES* optional -> "sptr"
; ※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 CreateDesktopA "CreateDesktopA" str, str, var, int, int, var
; res = CreateDesktopA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)
; lpszDesktop : LPCSTR -> "str"
; lpszDevice : LPCSTR optional -> "str"
; pDevmode : DEVMODEA* 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 CreateDesktopA(LPCSTR lpszDesktop, LPCSTR lpszDevice, DEVMODEA* pDevmode, DESKTOP_CONTROL_FLAGS dwFlags, DWORD dwDesiredAccess, SECURITY_ATTRIBUTES* lpsa)
#uselib "USER32.dll"
#cfunc global CreateDesktopA "CreateDesktopA" str, str, var, int, int, var
; res = CreateDesktopA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)
; lpszDesktop : LPCSTR -> "str"
; lpszDevice : LPCSTR optional -> "str"
; pDevmode : DEVMODEA* 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")
	procCreateDesktopA = user32.NewProc("CreateDesktopA")
)

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

function CreateDesktopA(
  lpszDesktop: PAnsiChar;   // LPCSTR
  lpszDevice: PAnsiChar;   // LPCSTR optional
  pDevmode: Pointer;   // DEVMODEA* optional
  dwFlags: DWORD;   // DESKTOP_CONTROL_FLAGS
  dwDesiredAccess: DWORD;   // DWORD
  lpsa: Pointer   // SECURITY_ATTRIBUTES* optional
): THandle; stdcall;
  external 'USER32.dll' name 'CreateDesktopA';

result := DllCall("USER32\CreateDesktopA"
    , "AStr", lpszDesktop   ; LPCSTR
    , "AStr", lpszDevice   ; LPCSTR optional
    , "Ptr", pDevmode   ; DEVMODEA* optional
    , "UInt", dwFlags   ; DESKTOP_CONTROL_FLAGS
    , "UInt", dwDesiredAccess   ; DWORD
    , "Ptr", lpsa   ; SECURITY_ATTRIBUTES* optional
    , "Ptr")   ; return: HDESK

●CreateDesktopA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa) = DLL("USER32.dll", "void* CreateDesktopA(char*, char*, void*, dword, dword, void*)")
# 呼び出し: CreateDesktopA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa)
# lpszDesktop : LPCSTR -> "char*"
# lpszDevice : LPCSTR optional -> "char*"
# pDevmode : DEVMODEA* 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)。