InvalidateRgn

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

BOOL InvalidateRgn(
    HWND hWnd,
    HRGN hRgn,   // optional
    BOOL bErase
);

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

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

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

require 'fiddle'
require 'fiddle/import'

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

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

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("USER32.dll")]
public static extern bool InvalidateRgn(IntPtr hWnd, IntPtr hRgn, bool bErase);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_InvalidateRgn' -Namespace Win32 -PassThru
# $api::InvalidateRgn(hWnd, hRgn, bErase)

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

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

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procInvalidateRgn = user32.NewProc("InvalidateRgn")
)

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

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

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

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