SetThreadDesktop

// USER32.dll
#include <windows.h>

BOOL SetThreadDesktop(
    HDESK hDesktop
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function SetThreadDesktop(
    hDesktop As IntPtr   ' HDESK
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hDesktop : HDESK
Declare PtrSafe Function SetThreadDesktop Lib "user32" ( _
    ByVal hDesktop As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SetThreadDesktop = ctypes.windll.user32.SetThreadDesktop
SetThreadDesktop.restype = wintypes.BOOL
SetThreadDesktop.argtypes = [
    wintypes.HANDLE,  # hDesktop : HDESK
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
SetThreadDesktop = Fiddle::Function.new(
  lib['SetThreadDesktop'],
  [
    Fiddle::TYPE_VOIDP,  # hDesktop : HDESK
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn SetThreadDesktop(
        hDesktop: *mut core::ffi::c_void  // HDESK
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", SetLastError = true)]
public static extern bool SetThreadDesktop(IntPtr hDesktop);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SetThreadDesktop' -Namespace Win32 -PassThru
# $api::SetThreadDesktop(hDesktop)

#uselib "USER32.dll"
#func global SetThreadDesktop "SetThreadDesktop" sptr
; SetThreadDesktop hDesktop   ; 戻り値は stat
; hDesktop : HDESK -> "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 SetThreadDesktop "SetThreadDesktop" sptr
; res = SetThreadDesktop(hDesktop)
; hDesktop : HDESK -> "sptr"

; BOOL SetThreadDesktop(HDESK hDesktop)
#uselib "USER32.dll"
#cfunc global SetThreadDesktop "SetThreadDesktop" intptr
; res = SetThreadDesktop(hDesktop)
; hDesktop : HDESK -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSetThreadDesktop = user32.NewProc("SetThreadDesktop")
)

// hDesktop (HDESK)
r1, _, err := procSetThreadDesktop.Call(
	uintptr(hDesktop),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetThreadDesktop(
  hDesktop: THandle   // HDESK
): BOOL; stdcall;
  external 'USER32.dll' name 'SetThreadDesktop';

result := DllCall("USER32\SetThreadDesktop"
    , "Ptr", hDesktop   ; HDESK
    , "Int")   ; return: BOOL

●SetThreadDesktop(hDesktop) = DLL("USER32.dll", "bool SetThreadDesktop(void*)")
# 呼び出し: SetThreadDesktop(hDesktop)
# hDesktop : HDESK -> "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 SetThreadDesktop(
    hDesktop: ?*anyopaque // HDESK
) callconv(std.os.windows.WINAPI) i32;

proc SetThreadDesktop(
    hDesktop: pointer  # HDESK
): int32 {.importc: "SetThreadDesktop", stdcall, dynlib: "USER32.dll".}

pragma(lib, "user32");
extern(Windows)
int SetThreadDesktop(
    void* hDesktop   // HDESK
);

ccall((:SetThreadDesktop, "USER32.dll"), stdcall, Int32,
      (Ptr{Cvoid},),
      hDesktop)
# hDesktop : HDESK -> Ptr{Cvoid}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t SetThreadDesktop(
    void* hDesktop);
]]
local user32 = ffi.load("user32")
-- user32.SetThreadDesktop(hDesktop)
-- hDesktop : HDESK
-- 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 SetThreadDesktop = lib.func('__stdcall', 'SetThreadDesktop', 'int32_t', ['void *']);
// SetThreadDesktop(hDesktop)
// hDesktop : HDESK -> '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", {
  SetThreadDesktop: { parameters: ["pointer"], result: "i32" },
});
// lib.symbols.SetThreadDesktop(hDesktop)
// hDesktop : HDESK -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t SetThreadDesktop(
    void* hDesktop);
C, "USER32.dll");
// $ffi->SetThreadDesktop(hDesktop);
// hDesktop : HDESK
// 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);
    boolean SetThreadDesktop(
        Pointer hDesktop   // HDESK
    );
}

@[Link("user32")]
lib LibUSER32
  fun SetThreadDesktop = SetThreadDesktop(
    hDesktop : Void*   # HDESK
  ) : Int32
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 SetThreadDesktopNative = Int32 Function(Pointer<Void>);
typedef SetThreadDesktopDart = int Function(Pointer<Void>);
final SetThreadDesktop = DynamicLibrary.open('USER32.dll')
    .lookupFunction<SetThreadDesktopNative, SetThreadDesktopDart>('SetThreadDesktop');
// hDesktop : HDESK -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SetThreadDesktop(
  hDesktop: THandle   // HDESK
): BOOL; stdcall;
  external 'USER32.dll' name 'SetThreadDesktop';

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

foreign import stdcall safe "SetThreadDesktop"
  c_SetThreadDesktop :: Ptr () -> IO CInt
-- hDesktop : HDESK -> 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 setthreaddesktop =
  foreign "SetThreadDesktop"
    ((ptr void) @-> returning int32_t)
(* hDesktop : HDESK -> (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 ("SetThreadDesktop" set-thread-desktop :convention :stdcall) :int32
  (h-desktop :pointer))   ; HDESK
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SetThreadDesktop = Win32::API::More->new('USER32',
    'BOOL SetThreadDesktop(HANDLE hDesktop)');
# my $ret = $SetThreadDesktop->Call($hDesktop);
# hDesktop : HDESK -> HANDLE
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。