ホーム › System.StationsAndDesktops › CreateDesktopExA

CreateDesktopExA

関数

ヒープサイズ等を指定してデスクトップを作成する。

DLLUSER32.dll文字セットANSI (-A)呼出規約winapiSetLastErrorあり対応OSWindows Vista 以降

シグネチャ

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

HDESK CreateDesktopExA(
    LPCSTR lpszDesktop,
    LPCSTR lpszDevice,   // optional
    DEVMODEA* pDevmode,   // optional
    DESKTOP_CONTROL_FLAGS dwFlags,
    DWORD dwDesiredAccess,
    SECURITY_ATTRIBUTES* lpsa,   // optional
    DWORD ulHeapSize,
    void* pvoid   // optional
);

パラメーター

名前	型	方向	説明
lpszDesktop	LPCSTR	in	作成または開くデスクトップの名前。
lpszDevice	LPCSTR	optional	予約済み。NULLを指定する必要がある。
pDevmode	DEVMODEA*	optional	予約済み。NULLを指定する必要がある。
dwFlags	DESKTOP_CONTROL_FLAGS	in	デスクトップ作成オプション。DF_ALLOWOTHERACCOUNTHOOK等。
dwDesiredAccess	DWORD	in	デスクトップに要求するアクセス権。DESKTOP_*の組み合わせ。
lpsa	SECURITY_ATTRIBUTES*	inoptional	ハンドル継承とセキュリティを指定するSECURITY_ATTRIBUTESへのポインタ。NULL可。
ulHeapSize	DWORD	in	デスクトップヒープのサイズ(KB単位)。
pvoid	void*	optional	予約済み。NULLを指定する必要がある。

戻り値の型: HDESK

各言語での呼び出し定義

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

HDESK CreateDesktopExA(
    LPCSTR lpszDesktop,
    LPCSTR lpszDevice,   // optional
    DEVMODEA* pDevmode,   // optional
    DESKTOP_CONTROL_FLAGS dwFlags,
    DWORD dwDesiredAccess,
    SECURITY_ATTRIBUTES* lpsa,   // optional
    DWORD ulHeapSize,
    void* pvoid   // optional
);

[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
static extern IntPtr CreateDesktopExA(
    [MarshalAs(UnmanagedType.LPStr)] string lpszDesktop,   // LPCSTR
    [MarshalAs(UnmanagedType.LPStr)] string lpszDevice,   // LPCSTR optional
    IntPtr pDevmode,   // DEVMODEA* optional
    uint dwFlags,   // DESKTOP_CONTROL_FLAGS
    uint dwDesiredAccess,   // DWORD
    IntPtr lpsa,   // SECURITY_ATTRIBUTES* optional
    uint ulHeapSize,   // DWORD
    IntPtr pvoid   // void* optional
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function CreateDesktopExA(
    <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
    ulHeapSize As UInteger,   ' DWORD
    pvoid As IntPtr   ' void* optional
) As IntPtr
End Function

' lpszDesktop : LPCSTR
' lpszDevice : LPCSTR optional
' pDevmode : DEVMODEA* optional
' dwFlags : DESKTOP_CONTROL_FLAGS
' dwDesiredAccess : DWORD
' lpsa : SECURITY_ATTRIBUTES* optional
' ulHeapSize : DWORD
' pvoid : void* optional
Declare PtrSafe Function CreateDesktopExA 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, _
    ByVal ulHeapSize As Long, _
    ByVal pvoid 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

CreateDesktopExA = ctypes.windll.user32.CreateDesktopExA
CreateDesktopExA.restype = ctypes.c_void_p
CreateDesktopExA.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
    wintypes.DWORD,  # ulHeapSize : DWORD
    ctypes.POINTER(None),  # pvoid : void* optional
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
CreateDesktopExA = Fiddle::Function.new(
  lib['CreateDesktopExA'],
  [
    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_INT,  # ulHeapSize : DWORD
    Fiddle::TYPE_VOIDP,  # pvoid : void* optional
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn CreateDesktopExA(
        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
        ulHeapSize: u32,  // DWORD
        pvoid: *mut ()  // void* 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 CreateDesktopExA([MarshalAs(UnmanagedType.LPStr)] string lpszDesktop, [MarshalAs(UnmanagedType.LPStr)] string lpszDevice, IntPtr pDevmode, uint dwFlags, uint dwDesiredAccess, IntPtr lpsa, uint ulHeapSize, IntPtr pvoid);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_CreateDesktopExA' -Namespace Win32 -PassThru
# $api::CreateDesktopExA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid)

#uselib "USER32.dll"
#func global CreateDesktopExA "CreateDesktopExA" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; CreateDesktopExA lpszDesktop, lpszDevice, varptr(pDevmode), dwFlags, dwDesiredAccess, varptr(lpsa), ulHeapSize, pvoid   ; 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"
; ulHeapSize : DWORD -> "sptr"
; pvoid : void* 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。

出力引数:

#uselib "USER32.dll"
#cfunc global CreateDesktopExA "CreateDesktopExA" str, str, var, int, int, var, int, sptr
; res = CreateDesktopExA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid)
; lpszDesktop : LPCSTR -> "str"
; lpszDevice : LPCSTR optional -> "str"
; pDevmode : DEVMODEA* optional -> "var"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "int"
; dwDesiredAccess : DWORD -> "int"
; lpsa : SECURITY_ATTRIBUTES* optional -> "var"
; ulHeapSize : DWORD -> "int"
; pvoid : void* optional -> "sptr"
; ※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。#uselib "USER32.dll"
#cfunc global CreateDesktopExA "CreateDesktopExA" str, str, sptr, int, int, sptr, int, sptr
; res = CreateDesktopExA(lpszDesktop, lpszDevice, varptr(pDevmode), dwFlags, dwDesiredAccess, varptr(lpsa), ulHeapSize, pvoid)
; lpszDesktop : LPCSTR -> "str"
; lpszDevice : LPCSTR optional -> "str"
; pDevmode : DEVMODEA* optional -> "sptr"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "int"
; dwDesiredAccess : DWORD -> "int"
; lpsa : SECURITY_ATTRIBUTES* optional -> "sptr"
; ulHeapSize : DWORD -> "int"
; pvoid : void* optional -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; HDESK CreateDesktopExA(LPCSTR lpszDesktop, LPCSTR lpszDevice, DEVMODEA* pDevmode, DESKTOP_CONTROL_FLAGS dwFlags, DWORD dwDesiredAccess, SECURITY_ATTRIBUTES* lpsa, DWORD ulHeapSize, void* pvoid)
#uselib "USER32.dll"
#cfunc global CreateDesktopExA "CreateDesktopExA" str, str, var, int, int, var, int, intptr
; res = CreateDesktopExA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid)
; lpszDesktop : LPCSTR -> "str"
; lpszDevice : LPCSTR optional -> "str"
; pDevmode : DEVMODEA* optional -> "var"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "int"
; dwDesiredAccess : DWORD -> "int"
; lpsa : SECURITY_ATTRIBUTES* optional -> "var"
; ulHeapSize : DWORD -> "int"
; pvoid : void* optional -> "intptr"
; ※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 CreateDesktopExA(LPCSTR lpszDesktop, LPCSTR lpszDevice, DEVMODEA* pDevmode, DESKTOP_CONTROL_FLAGS dwFlags, DWORD dwDesiredAccess, SECURITY_ATTRIBUTES* lpsa, DWORD ulHeapSize, void* pvoid)
#uselib "USER32.dll"
#cfunc global CreateDesktopExA "CreateDesktopExA" str, str, intptr, int, int, intptr, int, intptr
; res = CreateDesktopExA(lpszDesktop, lpszDevice, varptr(pDevmode), dwFlags, dwDesiredAccess, varptr(lpsa), ulHeapSize, pvoid)
; lpszDesktop : LPCSTR -> "str"
; lpszDevice : LPCSTR optional -> "str"
; pDevmode : DEVMODEA* optional -> "intptr"
; dwFlags : DESKTOP_CONTROL_FLAGS -> "int"
; dwDesiredAccess : DWORD -> "int"
; lpsa : SECURITY_ATTRIBUTES* optional -> "intptr"
; ulHeapSize : DWORD -> "int"
; pvoid : void* optional -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procCreateDesktopExA = user32.NewProc("CreateDesktopExA")
)

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

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

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

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

const std = @import("std");

extern "user32" fn CreateDesktopExA(
    lpszDesktop: [*c]const u8, // LPCSTR
    lpszDevice: [*c]const u8, // LPCSTR optional
    pDevmode: [*c]DEVMODEA, // DEVMODEA* optional
    dwFlags: u32, // DESKTOP_CONTROL_FLAGS
    dwDesiredAccess: u32, // DWORD
    lpsa: [*c]SECURITY_ATTRIBUTES, // SECURITY_ATTRIBUTES* optional
    ulHeapSize: u32, // DWORD
    pvoid: ?*anyopaque // void* optional
) callconv(std.os.windows.WINAPI) ?*anyopaque;

proc CreateDesktopExA(
    lpszDesktop: cstring,  # LPCSTR
    lpszDevice: cstring,  # LPCSTR optional
    pDevmode: ptr DEVMODEA,  # DEVMODEA* optional
    dwFlags: uint32,  # DESKTOP_CONTROL_FLAGS
    dwDesiredAccess: uint32,  # DWORD
    lpsa: ptr SECURITY_ATTRIBUTES,  # SECURITY_ATTRIBUTES* optional
    ulHeapSize: uint32,  # DWORD
    pvoid: pointer  # void* optional
): pointer {.importc: "CreateDesktopExA", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
void* CreateDesktopExA(
    const(char)* lpszDesktop,   // LPCSTR
    const(char)* lpszDevice,   // LPCSTR optional
    DEVMODEA* pDevmode,   // DEVMODEA* optional
    uint dwFlags,   // DESKTOP_CONTROL_FLAGS
    uint dwDesiredAccess,   // DWORD
    SECURITY_ATTRIBUTES* lpsa,   // SECURITY_ATTRIBUTES* optional
    uint ulHeapSize,   // DWORD
    void* pvoid   // void* optional
);

ccall((:CreateDesktopExA, "USER32.dll"), stdcall, Ptr{Cvoid},
      (Cstring, Cstring, Ptr{DEVMODEA}, UInt32, UInt32, Ptr{SECURITY_ATTRIBUTES}, UInt32, Ptr{Cvoid}),
      lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid)
# lpszDesktop : LPCSTR -> Cstring
# lpszDevice : LPCSTR optional -> Cstring
# pDevmode : DEVMODEA* optional -> Ptr{DEVMODEA}
# dwFlags : DESKTOP_CONTROL_FLAGS -> UInt32
# dwDesiredAccess : DWORD -> UInt32
# lpsa : SECURITY_ATTRIBUTES* optional -> Ptr{SECURITY_ATTRIBUTES}
# ulHeapSize : DWORD -> UInt32
# pvoid : void* optional -> Ptr{Cvoid}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
void* CreateDesktopExA(
    const char* lpszDesktop,
    const char* lpszDevice,
    void* pDevmode,
    uint32_t dwFlags,
    uint32_t dwDesiredAccess,
    void* lpsa,
    uint32_t ulHeapSize,
    void* pvoid);
]]
local user32 = ffi.load("user32")
-- user32.CreateDesktopExA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid)
-- lpszDesktop : LPCSTR
-- lpszDevice : LPCSTR optional
-- pDevmode : DEVMODEA* optional
-- dwFlags : DESKTOP_CONTROL_FLAGS
-- dwDesiredAccess : DWORD
-- lpsa : SECURITY_ATTRIBUTES* optional
-- ulHeapSize : DWORD
-- pvoid : void* optional
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('USER32.dll');
const CreateDesktopExA = lib.func('__stdcall', 'CreateDesktopExA', 'void *', ['str', 'str', 'void *', 'uint32_t', 'uint32_t', 'void *', 'uint32_t', 'void *']);
// CreateDesktopExA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid)
// lpszDesktop : LPCSTR -> 'str'
// lpszDevice : LPCSTR optional -> 'str'
// pDevmode : DEVMODEA* optional -> 'void *'
// dwFlags : DESKTOP_CONTROL_FLAGS -> 'uint32_t'
// dwDesiredAccess : DWORD -> 'uint32_t'
// lpsa : SECURITY_ATTRIBUTES* optional -> 'void *'
// ulHeapSize : DWORD -> 'uint32_t'
// pvoid : void* optional -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("USER32.dll", {
  CreateDesktopExA: { parameters: ["buffer", "buffer", "pointer", "u32", "u32", "pointer", "u32", "pointer"], result: "pointer" },
});
// lib.symbols.CreateDesktopExA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid)
// lpszDesktop : LPCSTR -> "buffer"
// lpszDevice : LPCSTR optional -> "buffer"
// pDevmode : DEVMODEA* optional -> "pointer"
// dwFlags : DESKTOP_CONTROL_FLAGS -> "u32"
// dwDesiredAccess : DWORD -> "u32"
// lpsa : SECURITY_ATTRIBUTES* optional -> "pointer"
// ulHeapSize : DWORD -> "u32"
// pvoid : void* optional -> "pointer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
void* CreateDesktopExA(
    const char* lpszDesktop,
    const char* lpszDevice,
    void* pDevmode,
    uint32_t dwFlags,
    uint32_t dwDesiredAccess,
    void* lpsa,
    uint32_t ulHeapSize,
    void* pvoid);
C, "USER32.dll");
// $ffi->CreateDesktopExA(lpszDesktop, lpszDevice, pDevmode, dwFlags, dwDesiredAccess, lpsa, ulHeapSize, pvoid);
// lpszDesktop : LPCSTR
// lpszDevice : LPCSTR optional
// pDevmode : DEVMODEA* optional
// dwFlags : DESKTOP_CONTROL_FLAGS
// dwDesiredAccess : DWORD
// lpsa : SECURITY_ATTRIBUTES* optional
// ulHeapSize : DWORD
// pvoid : void* optional
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface User32 extends StdCallLibrary {
    User32 INSTANCE = Native.load("user32", User32.class, W32APIOptions.ASCII_OPTIONS);
    Pointer CreateDesktopExA(
        String lpszDesktop,   // LPCSTR
        String lpszDevice,   // LPCSTR optional
        Pointer pDevmode,   // DEVMODEA* optional
        int dwFlags,   // DESKTOP_CONTROL_FLAGS
        int dwDesiredAccess,   // DWORD
        Pointer lpsa,   // SECURITY_ATTRIBUTES* optional
        int ulHeapSize,   // DWORD
        Pointer pvoid   // void* optional
    );
}

@[Link("user32")]
lib LibUSER32
  fun CreateDesktopExA = CreateDesktopExA(
    lpszDesktop : UInt8*,   # LPCSTR
    lpszDevice : UInt8*,   # LPCSTR optional
    pDevmode : DEVMODEA*,   # DEVMODEA* optional
    dwFlags : UInt32,   # DESKTOP_CONTROL_FLAGS
    dwDesiredAccess : UInt32,   # DWORD
    lpsa : SECURITY_ATTRIBUTES*,   # SECURITY_ATTRIBUTES* optional
    ulHeapSize : UInt32,   # DWORD
    pvoid : Void*   # void* optional
  ) : Void*
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef CreateDesktopExANative = Pointer<Void> Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Void>, Uint32, Uint32, Pointer<Void>, Uint32, Pointer<Void>);
typedef CreateDesktopExADart = Pointer<Void> Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Void>, int, int, Pointer<Void>, int, Pointer<Void>);
final CreateDesktopExA = DynamicLibrary.open('USER32.dll')
    .lookupFunction<CreateDesktopExANative, CreateDesktopExADart>('CreateDesktopExA');
// lpszDesktop : LPCSTR -> Pointer<Utf8>
// lpszDevice : LPCSTR optional -> Pointer<Utf8>
// pDevmode : DEVMODEA* optional -> Pointer<Void>
// dwFlags : DESKTOP_CONTROL_FLAGS -> Uint32
// dwDesiredAccess : DWORD -> Uint32
// lpsa : SECURITY_ATTRIBUTES* optional -> Pointer<Void>
// ulHeapSize : DWORD -> Uint32
// pvoid : void* optional -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function CreateDesktopExA(
  lpszDesktop: PAnsiChar;   // LPCSTR
  lpszDevice: PAnsiChar;   // LPCSTR optional
  pDevmode: Pointer;   // DEVMODEA* optional
  dwFlags: DWORD;   // DESKTOP_CONTROL_FLAGS
  dwDesiredAccess: DWORD;   // DWORD
  lpsa: Pointer;   // SECURITY_ATTRIBUTES* optional
  ulHeapSize: DWORD;   // DWORD
  pvoid: Pointer   // void* optional
): THandle; stdcall;
  external 'USER32.dll' name 'CreateDesktopExA';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "CreateDesktopExA"
  c_CreateDesktopExA :: CString -> CString -> Ptr () -> Word32 -> Word32 -> Ptr () -> Word32 -> Ptr () -> IO (Ptr ())
-- lpszDesktop : LPCSTR -> CString
-- lpszDevice : LPCSTR optional -> CString
-- pDevmode : DEVMODEA* optional -> Ptr ()
-- dwFlags : DESKTOP_CONTROL_FLAGS -> Word32
-- dwDesiredAccess : DWORD -> Word32
-- lpsa : SECURITY_ATTRIBUTES* optional -> Ptr ()
-- ulHeapSize : DWORD -> Word32
-- pvoid : void* optional -> Ptr ()
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let createdesktopexa =
  foreign "CreateDesktopExA"
    (string @-> string @-> (ptr void) @-> uint32_t @-> uint32_t @-> (ptr void) @-> uint32_t @-> (ptr void) @-> returning (ptr void))
(* lpszDesktop : LPCSTR -> string *)
(* lpszDevice : LPCSTR optional -> string *)
(* pDevmode : DEVMODEA* optional -> (ptr void) *)
(* dwFlags : DESKTOP_CONTROL_FLAGS -> uint32_t *)
(* dwDesiredAccess : DWORD -> uint32_t *)
(* lpsa : SECURITY_ATTRIBUTES* optional -> (ptr void) *)
(* ulHeapSize : DWORD -> uint32_t *)
(* pvoid : void* optional -> (ptr void) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library user32 (t "USER32.dll"))
(cffi:use-foreign-library user32)

(cffi:defcfun ("CreateDesktopExA" create-desktop-ex-a :convention :stdcall) :pointer
  (lpsz-desktop :string)   ; LPCSTR
  (lpsz-device :string)   ; LPCSTR optional
  (p-devmode :pointer)   ; DEVMODEA* optional
  (dw-flags :uint32)   ; DESKTOP_CONTROL_FLAGS
  (dw-desired-access :uint32)   ; DWORD
  (lpsa :pointer)   ; SECURITY_ATTRIBUTES* optional
  (ul-heap-size :uint32)   ; DWORD
  (pvoid :pointer))   ; void* optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $CreateDesktopExA = Win32::API::More->new('USER32',
    'HANDLE CreateDesktopExA(LPCSTR lpszDesktop, LPCSTR lpszDevice, LPVOID pDevmode, DWORD dwFlags, DWORD dwDesiredAccess, LPVOID lpsa, DWORD ulHeapSize, LPVOID pvoid)');
# my $ret = $CreateDesktopExA->Call($lpszDesktop, $lpszDevice, $pDevmode, $dwFlags, $dwDesiredAccess, $lpsa, $ulHeapSize, $pvoid);
# lpszDesktop : LPCSTR -> LPCSTR
# lpszDevice : LPCSTR optional -> LPCSTR
# pDevmode : DEVMODEA* optional -> LPVOID
# dwFlags : DESKTOP_CONTROL_FLAGS -> DWORD
# dwDesiredAccess : DWORD -> DWORD
# lpsa : SECURITY_ATTRIBUTES* optional -> LPVOID
# ulHeapSize : DWORD -> DWORD
# pvoid : void* optional -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

CreateDesktopExA

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