EnumWindows

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

BOOL EnumWindows(
    WNDENUMPROC lpEnumFunc,
    LPARAM lParam
);

<DllImport("USER32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function EnumWindows(
    lpEnumFunc As IntPtr,   ' WNDENUMPROC
    lParam As IntPtr   ' LPARAM
) As Boolean
End Function

' lpEnumFunc : WNDENUMPROC
' lParam : LPARAM
Declare PtrSafe Function EnumWindows Lib "user32" ( _
    ByVal lpEnumFunc As LongPtr, _
    ByVal lParam 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

EnumWindows = ctypes.windll.user32.EnumWindows
EnumWindows.restype = wintypes.BOOL
EnumWindows.argtypes = [
    ctypes.c_void_p,  # lpEnumFunc : WNDENUMPROC
    ctypes.c_ssize_t,  # lParam : LPARAM
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
EnumWindows = Fiddle::Function.new(
  lib['EnumWindows'],
  [
    Fiddle::TYPE_VOIDP,  # lpEnumFunc : WNDENUMPROC
    Fiddle::TYPE_INTPTR_T,  # lParam : LPARAM
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn EnumWindows(
        lpEnumFunc: *const core::ffi::c_void,  // WNDENUMPROC
        lParam: isize  // LPARAM
    ) -> 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 EnumWindows(IntPtr lpEnumFunc, IntPtr lParam);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_EnumWindows' -Namespace Win32 -PassThru
# $api::EnumWindows(lpEnumFunc, lParam)

#uselib "USER32.dll"
#func global EnumWindows "EnumWindows" sptr, sptr
; EnumWindows lpEnumFunc, lParam   ; 戻り値は stat
; lpEnumFunc : WNDENUMPROC -> "sptr"
; lParam : LPARAM -> "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 EnumWindows "EnumWindows" sptr, sptr
; res = EnumWindows(lpEnumFunc, lParam)
; lpEnumFunc : WNDENUMPROC -> "sptr"
; lParam : LPARAM -> "sptr"

; BOOL EnumWindows(WNDENUMPROC lpEnumFunc, LPARAM lParam)
#uselib "USER32.dll"
#cfunc global EnumWindows "EnumWindows" intptr, intptr
; res = EnumWindows(lpEnumFunc, lParam)
; lpEnumFunc : WNDENUMPROC -> "intptr"
; lParam : LPARAM -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procEnumWindows = user32.NewProc("EnumWindows")
)

// lpEnumFunc (WNDENUMPROC), lParam (LPARAM)
r1, _, err := procEnumWindows.Call(
	uintptr(lpEnumFunc),
	uintptr(lParam),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function EnumWindows(
  lpEnumFunc: Pointer;   // WNDENUMPROC
  lParam: NativeInt   // LPARAM
): BOOL; stdcall;
  external 'USER32.dll' name 'EnumWindows';

result := DllCall("USER32\EnumWindows"
    , "Ptr", lpEnumFunc   ; WNDENUMPROC
    , "Ptr", lParam   ; LPARAM
    , "Int")   ; return: BOOL

●EnumWindows(lpEnumFunc, lParam) = DLL("USER32.dll", "bool EnumWindows(void*, int)")
# 呼び出し: EnumWindows(lpEnumFunc, lParam)
# lpEnumFunc : WNDENUMPROC -> "void*"
# lParam : LPARAM -> "int"
# 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)。