GetGUIThreadInfo

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

BOOL GetGUIThreadInfo(
    DWORD idThread,
    GUITHREADINFO* pgui
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetGUIThreadInfo(
    idThread As UInteger,   ' DWORD
    pgui As IntPtr   ' GUITHREADINFO* in/out
) As Boolean
End Function

' idThread : DWORD
' pgui : GUITHREADINFO* in/out
Declare PtrSafe Function GetGUIThreadInfo Lib "user32" ( _
    ByVal idThread As Long, _
    ByVal pgui 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

GetGUIThreadInfo = ctypes.windll.user32.GetGUIThreadInfo
GetGUIThreadInfo.restype = wintypes.BOOL
GetGUIThreadInfo.argtypes = [
    wintypes.DWORD,  # idThread : DWORD
    ctypes.c_void_p,  # pgui : GUITHREADINFO* in/out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetGUIThreadInfo = Fiddle::Function.new(
  lib['GetGUIThreadInfo'],
  [
    -Fiddle::TYPE_INT,  # idThread : DWORD
    Fiddle::TYPE_VOIDP,  # pgui : GUITHREADINFO* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetGUIThreadInfo(
        idThread: u32,  // DWORD
        pgui: *mut GUITHREADINFO  // GUITHREADINFO* in/out
    ) -> 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 GetGUIThreadInfo(uint idThread, IntPtr pgui);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetGUIThreadInfo' -Namespace Win32 -PassThru
# $api::GetGUIThreadInfo(idThread, pgui)

#uselib "USER32.dll"
#func global GetGUIThreadInfo "GetGUIThreadInfo" sptr, sptr
; GetGUIThreadInfo idThread, varptr(pgui)   ; 戻り値は stat
; idThread : DWORD -> "sptr"
; pgui : GUITHREADINFO* in/out -> "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 GetGUIThreadInfo "GetGUIThreadInfo" int, var
; res = GetGUIThreadInfo(idThread, pgui)
; idThread : DWORD -> "int"
; pgui : GUITHREADINFO* in/out -> "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。

; BOOL GetGUIThreadInfo(DWORD idThread, GUITHREADINFO* pgui)
#uselib "USER32.dll"
#cfunc global GetGUIThreadInfo "GetGUIThreadInfo" int, var
; res = GetGUIThreadInfo(idThread, pgui)
; idThread : DWORD -> "int"
; pgui : GUITHREADINFO* in/out -> "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")
	procGetGUIThreadInfo = user32.NewProc("GetGUIThreadInfo")
)

// idThread (DWORD), pgui (GUITHREADINFO* in/out)
r1, _, err := procGetGUIThreadInfo.Call(
	uintptr(idThread),
	uintptr(pgui),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetGUIThreadInfo(
  idThread: DWORD;   // DWORD
  pgui: Pointer   // GUITHREADINFO* in/out
): BOOL; stdcall;
  external 'USER32.dll' name 'GetGUIThreadInfo';

result := DllCall("USER32\GetGUIThreadInfo"
    , "UInt", idThread   ; DWORD
    , "Ptr", pgui   ; GUITHREADINFO* in/out
    , "Int")   ; return: BOOL

●GetGUIThreadInfo(idThread, pgui) = DLL("USER32.dll", "bool GetGUIThreadInfo(dword, void*)")
# 呼び出し: GetGUIThreadInfo(idThread, pgui)
# idThread : DWORD -> "dword"
# pgui : GUITHREADINFO* in/out -> "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)。