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 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)。