CreateEllipticRgn

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

HRGN CreateEllipticRgn(
    INT x1,
    INT y1,
    INT x2,
    INT y2
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function CreateEllipticRgn(
    x1 As Integer,   ' INT
    y1 As Integer,   ' INT
    x2 As Integer,   ' INT
    y2 As Integer   ' INT
) As IntPtr
End Function

' x1 : INT
' y1 : INT
' x2 : INT
' y2 : INT
Declare PtrSafe Function CreateEllipticRgn Lib "gdi32" ( _
    ByVal x1 As Long, _
    ByVal y1 As Long, _
    ByVal x2 As Long, _
    ByVal y2 As Long) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

CreateEllipticRgn = ctypes.windll.gdi32.CreateEllipticRgn
CreateEllipticRgn.restype = ctypes.c_void_p
CreateEllipticRgn.argtypes = [
    ctypes.c_int,  # x1 : INT
    ctypes.c_int,  # y1 : INT
    ctypes.c_int,  # x2 : INT
    ctypes.c_int,  # y2 : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
CreateEllipticRgn = Fiddle::Function.new(
  lib['CreateEllipticRgn'],
  [
    Fiddle::TYPE_INT,  # x1 : INT
    Fiddle::TYPE_INT,  # y1 : INT
    Fiddle::TYPE_INT,  # x2 : INT
    Fiddle::TYPE_INT,  # y2 : INT
  ],
  Fiddle::TYPE_VOIDP)

#[link(name = "gdi32")]
extern "system" {
    fn CreateEllipticRgn(
        x1: i32,  // INT
        y1: i32,  // INT
        x2: i32,  // INT
        y2: i32  // INT
    ) -> *mut core::ffi::c_void;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("GDI32.dll")]
public static extern IntPtr CreateEllipticRgn(int x1, int y1, int x2, int y2);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_CreateEllipticRgn' -Namespace Win32 -PassThru
# $api::CreateEllipticRgn(x1, y1, x2, y2)

#uselib "GDI32.dll"
#func global CreateEllipticRgn "CreateEllipticRgn" sptr, sptr, sptr, sptr
; CreateEllipticRgn x1, y1, x2, y2   ; 戻り値は stat
; x1 : INT -> "sptr"
; y1 : INT -> "sptr"
; x2 : INT -> "sptr"
; y2 : 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 CreateEllipticRgn "CreateEllipticRgn" int, int, int, int
; res = CreateEllipticRgn(x1, y1, x2, y2)
; x1 : INT -> "int"
; y1 : INT -> "int"
; x2 : INT -> "int"
; y2 : INT -> "int"

; HRGN CreateEllipticRgn(INT x1, INT y1, INT x2, INT y2)
#uselib "GDI32.dll"
#cfunc global CreateEllipticRgn "CreateEllipticRgn" int, int, int, int
; res = CreateEllipticRgn(x1, y1, x2, y2)
; x1 : INT -> "int"
; y1 : INT -> "int"
; x2 : INT -> "int"
; y2 : INT -> "int"

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

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procCreateEllipticRgn = gdi32.NewProc("CreateEllipticRgn")
)

// x1 (INT), y1 (INT), x2 (INT), y2 (INT)
r1, _, err := procCreateEllipticRgn.Call(
	uintptr(x1),
	uintptr(y1),
	uintptr(x2),
	uintptr(y2),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRGN

function CreateEllipticRgn(
  x1: Integer;   // INT
  y1: Integer;   // INT
  x2: Integer;   // INT
  y2: Integer   // INT
): THandle; stdcall;
  external 'GDI32.dll' name 'CreateEllipticRgn';

result := DllCall("GDI32\CreateEllipticRgn"
    , "Int", x1   ; INT
    , "Int", y1   ; INT
    , "Int", x2   ; INT
    , "Int", y2   ; INT
    , "Ptr")   ; return: HRGN

●CreateEllipticRgn(x1, y1, x2, y2) = DLL("GDI32.dll", "void* CreateEllipticRgn(int, int, int, int)")
# 呼び出し: CreateEllipticRgn(x1, y1, x2, y2)
# x1 : INT -> "int"
# y1 : INT -> "int"
# x2 : INT -> "int"
# y2 : 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)。