ValidateRgn

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

BOOL ValidateRgn(
    HWND hWnd,
    HRGN hRgn   // optional
);

<DllImport("USER32.dll", ExactSpelling:=True)>
Public Shared Function ValidateRgn(
    hWnd As IntPtr,   ' HWND
    hRgn As IntPtr   ' HRGN optional
) As Boolean
End Function

' hWnd : HWND
' hRgn : HRGN optional
Declare PtrSafe Function ValidateRgn Lib "user32" ( _
    ByVal hWnd As LongPtr, _
    ByVal hRgn 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

ValidateRgn = ctypes.windll.user32.ValidateRgn
ValidateRgn.restype = wintypes.BOOL
ValidateRgn.argtypes = [
    wintypes.HANDLE,  # hWnd : HWND
    wintypes.HANDLE,  # hRgn : HRGN optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('USER32.dll')
ValidateRgn = Fiddle::Function.new(
  lib['ValidateRgn'],
  [
    Fiddle::TYPE_VOIDP,  # hWnd : HWND
    Fiddle::TYPE_VOIDP,  # hRgn : HRGN optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "user32")]
extern "system" {
    fn ValidateRgn(
        hWnd: *mut core::ffi::c_void,  // HWND
        hRgn: *mut core::ffi::c_void  // HRGN optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll")]
public static extern bool ValidateRgn(IntPtr hWnd, IntPtr hRgn);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_ValidateRgn' -Namespace Win32 -PassThru
# $api::ValidateRgn(hWnd, hRgn)

#uselib "USER32.dll"
#func global ValidateRgn "ValidateRgn" sptr, sptr
; ValidateRgn hWnd, hRgn   ; 戻り値は stat
; hWnd : HWND -> "sptr"
; hRgn : HRGN optional -> "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 ValidateRgn "ValidateRgn" sptr, sptr
; res = ValidateRgn(hWnd, hRgn)
; hWnd : HWND -> "sptr"
; hRgn : HRGN optional -> "sptr"

; BOOL ValidateRgn(HWND hWnd, HRGN hRgn)
#uselib "USER32.dll"
#cfunc global ValidateRgn "ValidateRgn" intptr, intptr
; res = ValidateRgn(hWnd, hRgn)
; hWnd : HWND -> "intptr"
; hRgn : HRGN optional -> "intptr"

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procValidateRgn = user32.NewProc("ValidateRgn")
)

// hWnd (HWND), hRgn (HRGN optional)
r1, _, err := procValidateRgn.Call(
	uintptr(hWnd),
	uintptr(hRgn),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function ValidateRgn(
  hWnd: THandle;   // HWND
  hRgn: THandle   // HRGN optional
): BOOL; stdcall;
  external 'USER32.dll' name 'ValidateRgn';

result := DllCall("USER32\ValidateRgn"
    , "Ptr", hWnd   ; HWND
    , "Ptr", hRgn   ; HRGN optional
    , "Int")   ; return: BOOL

●ValidateRgn(hWnd, hRgn) = DLL("USER32.dll", "bool ValidateRgn(void*, void*)")
# 呼び出し: ValidateRgn(hWnd, hRgn)
# hWnd : HWND -> "void*"
# hRgn : HRGN optional -> "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)。