SetRectRgn

// GDI32.dll
#include <windows.h>

BOOL SetRectRgn(
    HRGN hrgn,
    INT left,
    INT top,
    INT right,
    INT bottom
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function SetRectRgn(
    hrgn As IntPtr,   ' HRGN
    left As Integer,   ' INT
    top As Integer,   ' INT
    right As Integer,   ' INT
    bottom As Integer   ' INT
) As Boolean
End Function

' hrgn : HRGN
' left : INT
' top : INT
' right : INT
' bottom : INT
Declare PtrSafe Function SetRectRgn Lib "gdi32" ( _
    ByVal hrgn As LongPtr, _
    ByVal left As Long, _
    ByVal top As Long, _
    ByVal right As Long, _
    ByVal bottom 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

SetRectRgn = ctypes.windll.gdi32.SetRectRgn
SetRectRgn.restype = wintypes.BOOL
SetRectRgn.argtypes = [
    wintypes.HANDLE,  # hrgn : HRGN
    ctypes.c_int,  # left : INT
    ctypes.c_int,  # top : INT
    ctypes.c_int,  # right : INT
    ctypes.c_int,  # bottom : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
SetRectRgn = Fiddle::Function.new(
  lib['SetRectRgn'],
  [
    Fiddle::TYPE_VOIDP,  # hrgn : HRGN
    Fiddle::TYPE_INT,  # left : INT
    Fiddle::TYPE_INT,  # top : INT
    Fiddle::TYPE_INT,  # right : INT
    Fiddle::TYPE_INT,  # bottom : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn SetRectRgn(
        hrgn: *mut core::ffi::c_void,  // HRGN
        left: i32,  // INT
        top: i32,  // INT
        right: i32,  // INT
        bottom: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("GDI32.dll")]
public static extern bool SetRectRgn(IntPtr hrgn, int left, int top, int right, int bottom);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_SetRectRgn' -Namespace Win32 -PassThru
# $api::SetRectRgn(hrgn, left, top, right, bottom)

#uselib "GDI32.dll"
#func global SetRectRgn "SetRectRgn" sptr, sptr, sptr, sptr, sptr
; SetRectRgn hrgn, left, top, right, bottom   ; 戻り値は stat
; hrgn : HRGN -> "sptr"
; left : INT -> "sptr"
; top : INT -> "sptr"
; right : INT -> "sptr"
; bottom : INT -> "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 "GDI32.dll"
#cfunc global SetRectRgn "SetRectRgn" sptr, int, int, int, int
; res = SetRectRgn(hrgn, left, top, right, bottom)
; hrgn : HRGN -> "sptr"
; left : INT -> "int"
; top : INT -> "int"
; right : INT -> "int"
; bottom : INT -> "int"

; BOOL SetRectRgn(HRGN hrgn, INT left, INT top, INT right, INT bottom)
#uselib "GDI32.dll"
#cfunc global SetRectRgn "SetRectRgn" intptr, int, int, int, int
; res = SetRectRgn(hrgn, left, top, right, bottom)
; hrgn : HRGN -> "intptr"
; left : INT -> "int"
; top : INT -> "int"
; right : INT -> "int"
; bottom : INT -> "int"

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

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procSetRectRgn = gdi32.NewProc("SetRectRgn")
)

// hrgn (HRGN), left (INT), top (INT), right (INT), bottom (INT)
r1, _, err := procSetRectRgn.Call(
	uintptr(hrgn),
	uintptr(left),
	uintptr(top),
	uintptr(right),
	uintptr(bottom),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function SetRectRgn(
  hrgn: THandle;   // HRGN
  left: Integer;   // INT
  top: Integer;   // INT
  right: Integer;   // INT
  bottom: Integer   // INT
): BOOL; stdcall;
  external 'GDI32.dll' name 'SetRectRgn';

result := DllCall("GDI32\SetRectRgn"
    , "Ptr", hrgn   ; HRGN
    , "Int", left   ; INT
    , "Int", top   ; INT
    , "Int", right   ; INT
    , "Int", bottom   ; INT
    , "Int")   ; return: BOOL

●SetRectRgn(hrgn, left, top, right, bottom) = DLL("GDI32.dll", "bool SetRectRgn(void*, int, int, int, int)")
# 呼び出し: SetRectRgn(hrgn, left, top, right, bottom)
# hrgn : HRGN -> "void*"
# left : INT -> "int"
# top : INT -> "int"
# right : INT -> "int"
# bottom : INT -> "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)。