GetAltTabInfoA

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

BOOL GetAltTabInfoA(
    HWND hwnd,   // optional
    INT iItem,
    ALTTABINFO* pati,
    LPSTR pszItemText,   // optional
    DWORD cchItemText
);

<DllImport("USER32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetAltTabInfoA(
    hwnd As IntPtr,   ' HWND optional
    iItem As Integer,   ' INT
    pati As IntPtr,   ' ALTTABINFO* in/out
    <MarshalAs(UnmanagedType.LPStr)> pszItemText As System.Text.StringBuilder,   ' LPSTR optional, out
    cchItemText As UInteger   ' DWORD
) As Boolean
End Function

' hwnd : HWND optional
' iItem : INT
' pati : ALTTABINFO* in/out
' pszItemText : LPSTR optional, out
' cchItemText : DWORD
Declare PtrSafe Function GetAltTabInfoA Lib "user32" ( _
    ByVal hwnd As LongPtr, _
    ByVal iItem As Long, _
    ByVal pati As LongPtr, _
    ByVal pszItemText As String, _
    ByVal cchItemText As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetAltTabInfoA = ctypes.windll.user32.GetAltTabInfoA
GetAltTabInfoA.restype = wintypes.BOOL
GetAltTabInfoA.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND optional
    ctypes.c_int,  # iItem : INT
    ctypes.c_void_p,  # pati : ALTTABINFO* in/out
    wintypes.LPSTR,  # pszItemText : LPSTR optional, out
    wintypes.DWORD,  # cchItemText : DWORD
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
GetAltTabInfoA = Fiddle::Function.new(
  lib['GetAltTabInfoA'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND optional
    Fiddle::TYPE_INT,  # iItem : INT
    Fiddle::TYPE_VOIDP,  # pati : ALTTABINFO* in/out
    Fiddle::TYPE_VOIDP,  # pszItemText : LPSTR optional, out
    -Fiddle::TYPE_INT,  # cchItemText : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn GetAltTabInfoA(
        hwnd: *mut core::ffi::c_void,  // HWND optional
        iItem: i32,  // INT
        pati: *mut ALTTABINFO,  // ALTTABINFO* in/out
        pszItemText: *mut u8,  // LPSTR optional, out
        cchItemText: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool GetAltTabInfoA(IntPtr hwnd, int iItem, IntPtr pati, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder pszItemText, uint cchItemText);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_GetAltTabInfoA' -Namespace Win32 -PassThru
# $api::GetAltTabInfoA(hwnd, iItem, pati, pszItemText, cchItemText)

#uselib "USER32.dll"
#func global GetAltTabInfoA "GetAltTabInfoA" sptr, sptr, sptr, sptr, sptr
; GetAltTabInfoA hwnd, iItem, varptr(pati), varptr(pszItemText), cchItemText   ; 戻り値は stat
; hwnd : HWND optional -> "sptr"
; iItem : INT -> "sptr"
; pati : ALTTABINFO* in/out -> "sptr"
; pszItemText : LPSTR optional, out -> "sptr"
; cchItemText : 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 GetAltTabInfoA "GetAltTabInfoA" sptr, int, var, var, int
; res = GetAltTabInfoA(hwnd, iItem, pati, pszItemText, cchItemText)
; hwnd : HWND optional -> "sptr"
; iItem : INT -> "int"
; pati : ALTTABINFO* in/out -> "var"
; pszItemText : LPSTR optional, out -> "var"
; cchItemText : DWORD -> "int"
; ※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 GetAltTabInfoA(HWND hwnd, INT iItem, ALTTABINFO* pati, LPSTR pszItemText, DWORD cchItemText)
#uselib "USER32.dll"
#cfunc global GetAltTabInfoA "GetAltTabInfoA" intptr, int, var, var, int
; res = GetAltTabInfoA(hwnd, iItem, pati, pszItemText, cchItemText)
; hwnd : HWND optional -> "intptr"
; iItem : INT -> "int"
; pati : ALTTABINFO* in/out -> "var"
; pszItemText : LPSTR optional, out -> "var"
; cchItemText : DWORD -> "int"
; ※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")
	procGetAltTabInfoA = user32.NewProc("GetAltTabInfoA")
)

// hwnd (HWND optional), iItem (INT), pati (ALTTABINFO* in/out), pszItemText (LPSTR optional, out), cchItemText (DWORD)
r1, _, err := procGetAltTabInfoA.Call(
	uintptr(hwnd),
	uintptr(iItem),
	uintptr(pati),
	uintptr(pszItemText),
	uintptr(cchItemText),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function GetAltTabInfoA(
  hwnd: THandle;   // HWND optional
  iItem: Integer;   // INT
  pati: Pointer;   // ALTTABINFO* in/out
  pszItemText: PAnsiChar;   // LPSTR optional, out
  cchItemText: DWORD   // DWORD
): BOOL; stdcall;
  external 'USER32.dll' name 'GetAltTabInfoA';

result := DllCall("USER32\GetAltTabInfoA"
    , "Ptr", hwnd   ; HWND optional
    , "Int", iItem   ; INT
    , "Ptr", pati   ; ALTTABINFO* in/out
    , "Ptr", pszItemText   ; LPSTR optional, out
    , "UInt", cchItemText   ; DWORD
    , "Int")   ; return: BOOL

●GetAltTabInfoA(hwnd, iItem, pati, pszItemText, cchItemText) = DLL("USER32.dll", "bool GetAltTabInfoA(void*, int, void*, char*, dword)")
# 呼び出し: GetAltTabInfoA(hwnd, iItem, pati, pszItemText, cchItemText)
# hwnd : HWND optional -> "void*"
# iItem : INT -> "int"
# pati : ALTTABINFO* in/out -> "void*"
# pszItemText : LPSTR optional, out -> "char*"
# cchItemText : 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)。