GetThreadDesktop

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

HDESK GetThreadDesktop(
    DWORD dwThreadId
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetThreadDesktop(
    dwThreadId As UInteger   ' DWORD
) As IntPtr
End Function

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

import ctypes
from ctypes import wintypes

GetThreadDesktop = ctypes.windll.user32.GetThreadDesktop
GetThreadDesktop.restype = ctypes.c_void_p
GetThreadDesktop.argtypes = [
    wintypes.DWORD,  # dwThreadId : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetThreadDesktop = Fiddle::Function.new(
  lib['GetThreadDesktop'],
  [
    -Fiddle::TYPE_INT,  # dwThreadId : DWORD
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "user32")]
extern "system" {
    fn GetThreadDesktop(
        dwThreadId: u32  // DWORD
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("USER32.dll", SetLastError = true)]
public static extern IntPtr GetThreadDesktop(uint dwThreadId);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetThreadDesktop' -Namespace Win32 -PassThru
# $api::GetThreadDesktop(dwThreadId)

#uselib "USER32.dll"
#func global GetThreadDesktop "GetThreadDesktop" sptr
; GetThreadDesktop dwThreadId   ; 戻り値は stat
; dwThreadId : DWORD -> "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 GetThreadDesktop "GetThreadDesktop" int
; res = GetThreadDesktop(dwThreadId)
; dwThreadId : DWORD -> "int"

; HDESK GetThreadDesktop(DWORD dwThreadId)
#uselib "USER32.dll"
#cfunc global GetThreadDesktop "GetThreadDesktop" int
; res = GetThreadDesktop(dwThreadId)
; dwThreadId : DWORD -> "int"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procGetThreadDesktop = user32.NewProc("GetThreadDesktop")
)

// dwThreadId (DWORD)
r1, _, err := procGetThreadDesktop.Call(
	uintptr(dwThreadId),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HDESK

function GetThreadDesktop(
  dwThreadId: DWORD   // DWORD
): THandle; stdcall;
  external 'USER32.dll' name 'GetThreadDesktop';

result := DllCall("USER32\GetThreadDesktop"
    , "UInt", dwThreadId   ; DWORD
    , "Ptr")   ; return: HDESK

●GetThreadDesktop(dwThreadId) = DLL("USER32.dll", "void* GetThreadDesktop(dword)")
# 呼び出し: GetThreadDesktop(dwThreadId)
# dwThreadId : DWORD -> "dword"
# 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)。