SetWindowRgn

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

INT SetWindowRgn(
    HWND hWnd,
    HRGN hRgn,   // optional
    BOOL bRedraw
);

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

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

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

require 'fiddle'
require 'fiddle/import'

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

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

$sig = @"
[DllImport("USER32.dll")]
public static extern int SetWindowRgn(IntPtr hWnd, IntPtr hRgn, bool bRedraw);
"@
$api = Add-Type -MemberDefinition $sig -Name 'USER32_SetWindowRgn' -Namespace Win32 -PassThru
# $api::SetWindowRgn(hWnd, hRgn, bRedraw)

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

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

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

var (
	user32 = windows.NewLazySystemDLL("USER32.dll")
	procSetWindowRgn = user32.NewProc("SetWindowRgn")
)

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

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

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

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