RoundRect

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

BOOL RoundRect(
    HDC hdc,
    INT left,
    INT top,
    INT right,
    INT bottom,
    INT width,
    INT height
);

<DllImport("GDI32.dll", ExactSpelling:=True)>
Public Shared Function RoundRect(
    hdc As IntPtr,   ' HDC
    left As Integer,   ' INT
    top As Integer,   ' INT
    right As Integer,   ' INT
    bottom As Integer,   ' INT
    width As Integer,   ' INT
    height As Integer   ' INT
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hdc : HDC
' left : INT
' top : INT
' right : INT
' bottom : INT
' width : INT
' height : INT
Declare PtrSafe Function RoundRect Lib "gdi32" ( _
    ByVal hdc As LongPtr, _
    ByVal left As Long, _
    ByVal top As Long, _
    ByVal right As Long, _
    ByVal bottom As Long, _
    ByVal width As Long, _
    ByVal height 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

RoundRect = ctypes.windll.gdi32.RoundRect
RoundRect.restype = wintypes.BOOL
RoundRect.argtypes = [
    wintypes.HANDLE,  # hdc : HDC
    ctypes.c_int,  # left : INT
    ctypes.c_int,  # top : INT
    ctypes.c_int,  # right : INT
    ctypes.c_int,  # bottom : INT
    ctypes.c_int,  # width : INT
    ctypes.c_int,  # height : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('GDI32.dll')
RoundRect = Fiddle::Function.new(
  lib['RoundRect'],
  [
    Fiddle::TYPE_VOIDP,  # hdc : HDC
    Fiddle::TYPE_INT,  # left : INT
    Fiddle::TYPE_INT,  # top : INT
    Fiddle::TYPE_INT,  # right : INT
    Fiddle::TYPE_INT,  # bottom : INT
    Fiddle::TYPE_INT,  # width : INT
    Fiddle::TYPE_INT,  # height : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdi32")]
extern "system" {
    fn RoundRect(
        hdc: *mut core::ffi::c_void,  // HDC
        left: i32,  // INT
        top: i32,  // INT
        right: i32,  // INT
        bottom: i32,  // INT
        width: i32,  // INT
        height: 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 RoundRect(IntPtr hdc, int left, int top, int right, int bottom, int width, int height);
"@
$api = Add-Type -MemberDefinition $sig -Name 'GDI32_RoundRect' -Namespace Win32 -PassThru
# $api::RoundRect(hdc, left, top, right, bottom, width, height)

#uselib "GDI32.dll"
#func global RoundRect "RoundRect" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; RoundRect hdc, left, top, right, bottom, width, height   ; 戻り値は stat
; hdc : HDC -> "sptr"
; left : INT -> "sptr"
; top : INT -> "sptr"
; right : INT -> "sptr"
; bottom : INT -> "sptr"
; width : INT -> "sptr"
; height : 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 RoundRect "RoundRect" sptr, int, int, int, int, int, int
; res = RoundRect(hdc, left, top, right, bottom, width, height)
; hdc : HDC -> "sptr"
; left : INT -> "int"
; top : INT -> "int"
; right : INT -> "int"
; bottom : INT -> "int"
; width : INT -> "int"
; height : INT -> "int"

; BOOL RoundRect(HDC hdc, INT left, INT top, INT right, INT bottom, INT width, INT height)
#uselib "GDI32.dll"
#cfunc global RoundRect "RoundRect" intptr, int, int, int, int, int, int
; res = RoundRect(hdc, left, top, right, bottom, width, height)
; hdc : HDC -> "intptr"
; left : INT -> "int"
; top : INT -> "int"
; right : INT -> "int"
; bottom : INT -> "int"
; width : INT -> "int"
; height : INT -> "int"

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

var (
	gdi32 = windows.NewLazySystemDLL("GDI32.dll")
	procRoundRect = gdi32.NewProc("RoundRect")
)

// hdc (HDC), left (INT), top (INT), right (INT), bottom (INT), width (INT), height (INT)
r1, _, err := procRoundRect.Call(
	uintptr(hdc),
	uintptr(left),
	uintptr(top),
	uintptr(right),
	uintptr(bottom),
	uintptr(width),
	uintptr(height),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function RoundRect(
  hdc: THandle;   // HDC
  left: Integer;   // INT
  top: Integer;   // INT
  right: Integer;   // INT
  bottom: Integer;   // INT
  width: Integer;   // INT
  height: Integer   // INT
): BOOL; stdcall;
  external 'GDI32.dll' name 'RoundRect';

result := DllCall("GDI32\RoundRect"
    , "Ptr", hdc   ; HDC
    , "Int", left   ; INT
    , "Int", top   ; INT
    , "Int", right   ; INT
    , "Int", bottom   ; INT
    , "Int", width   ; INT
    , "Int", height   ; INT
    , "Int")   ; return: BOOL

●RoundRect(hdc, left, top, right, bottom, width, height) = DLL("GDI32.dll", "bool RoundRect(void*, int, int, int, int, int, int)")
# 呼び出し: RoundRect(hdc, left, top, right, bottom, width, height)
# hdc : HDC -> "void*"
# left : INT -> "int"
# top : INT -> "int"
# right : INT -> "int"
# bottom : INT -> "int"
# width : INT -> "int"
# height : 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)。

const std = @import("std");

extern "gdi32" fn RoundRect(
    hdc: ?*anyopaque, // HDC
    left: i32, // INT
    top: i32, // INT
    right: i32, // INT
    bottom: i32, // INT
    width: i32, // INT
    height: i32 // INT
) callconv(std.os.windows.WINAPI) i32;

proc RoundRect(
    hdc: pointer,  # HDC
    left: int32,  # INT
    top: int32,  # INT
    right: int32,  # INT
    bottom: int32,  # INT
    width: int32,  # INT
    height: int32  # INT
): int32 {.importc: "RoundRect", stdcall, dynlib: "GDI32.dll".}

pragma(lib, "gdi32");
extern(Windows)
int RoundRect(
    void* hdc,   // HDC
    int left,   // INT
    int top,   // INT
    int right,   // INT
    int bottom,   // INT
    int width,   // INT
    int height   // INT
);

ccall((:RoundRect, "GDI32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Int32, Int32, Int32, Int32, Int32, Int32),
      hdc, left, top, right, bottom, width, height)
# hdc : HDC -> Ptr{Cvoid}
# left : INT -> Int32
# top : INT -> Int32
# right : INT -> Int32
# bottom : INT -> Int32
# width : INT -> Int32
# height : INT -> Int32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t RoundRect(
    void* hdc,
    int32_t left,
    int32_t top,
    int32_t right,
    int32_t bottom,
    int32_t width,
    int32_t height);
]]
local gdi32 = ffi.load("gdi32")
-- gdi32.RoundRect(hdc, left, top, right, bottom, width, height)
-- hdc : HDC
-- left : INT
-- top : INT
-- right : INT
-- bottom : INT
-- width : INT
-- height : INT
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('GDI32.dll');
const RoundRect = lib.func('__stdcall', 'RoundRect', 'int32_t', ['void *', 'int32_t', 'int32_t', 'int32_t', 'int32_t', 'int32_t', 'int32_t']);
// RoundRect(hdc, left, top, right, bottom, width, height)
// hdc : HDC -> 'void *'
// left : INT -> 'int32_t'
// top : INT -> 'int32_t'
// right : INT -> 'int32_t'
// bottom : INT -> 'int32_t'
// width : INT -> 'int32_t'
// height : INT -> 'int32_t'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("GDI32.dll", {
  RoundRect: { parameters: ["pointer", "i32", "i32", "i32", "i32", "i32", "i32"], result: "i32" },
});
// lib.symbols.RoundRect(hdc, left, top, right, bottom, width, height)
// hdc : HDC -> "pointer"
// left : INT -> "i32"
// top : INT -> "i32"
// right : INT -> "i32"
// bottom : INT -> "i32"
// width : INT -> "i32"
// height : INT -> "i32"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t RoundRect(
    void* hdc,
    int32_t left,
    int32_t top,
    int32_t right,
    int32_t bottom,
    int32_t width,
    int32_t height);
C, "GDI32.dll");
// $ffi->RoundRect(hdc, left, top, right, bottom, width, height);
// hdc : HDC
// left : INT
// top : INT
// right : INT
// bottom : INT
// width : INT
// height : INT
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Gdi32 extends StdCallLibrary {
    Gdi32 INSTANCE = Native.load("gdi32", Gdi32.class);
    boolean RoundRect(
        Pointer hdc,   // HDC
        int left,   // INT
        int top,   // INT
        int right,   // INT
        int bottom,   // INT
        int width,   // INT
        int height   // INT
    );
}

@[Link("gdi32")]
lib LibGDI32
  fun RoundRect = RoundRect(
    hdc : Void*,   # HDC
    left : Int32,   # INT
    top : Int32,   # INT
    right : Int32,   # INT
    bottom : Int32,   # INT
    width : Int32,   # INT
    height : Int32   # INT
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef RoundRectNative = Int32 Function(Pointer<Void>, Int32, Int32, Int32, Int32, Int32, Int32);
typedef RoundRectDart = int Function(Pointer<Void>, int, int, int, int, int, int);
final RoundRect = DynamicLibrary.open('GDI32.dll')
    .lookupFunction<RoundRectNative, RoundRectDart>('RoundRect');
// hdc : HDC -> Pointer<Void>
// left : INT -> Int32
// top : INT -> Int32
// right : INT -> Int32
// bottom : INT -> Int32
// width : INT -> Int32
// height : INT -> Int32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function RoundRect(
  hdc: THandle;   // HDC
  left: Integer;   // INT
  top: Integer;   // INT
  right: Integer;   // INT
  bottom: Integer;   // INT
  width: Integer;   // INT
  height: Integer   // INT
): BOOL; stdcall;
  external 'GDI32.dll' name 'RoundRect';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "RoundRect"
  c_RoundRect :: Ptr () -> Int32 -> Int32 -> Int32 -> Int32 -> Int32 -> Int32 -> IO CInt
-- hdc : HDC -> Ptr ()
-- left : INT -> Int32
-- top : INT -> Int32
-- right : INT -> Int32
-- bottom : INT -> Int32
-- width : INT -> Int32
-- height : INT -> Int32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let roundrect =
  foreign "RoundRect"
    ((ptr void) @-> int32_t @-> int32_t @-> int32_t @-> int32_t @-> int32_t @-> int32_t @-> returning int32_t)
(* hdc : HDC -> (ptr void) *)
(* left : INT -> int32_t *)
(* top : INT -> int32_t *)
(* right : INT -> int32_t *)
(* bottom : INT -> int32_t *)
(* width : INT -> int32_t *)
(* height : INT -> int32_t *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library gdi32 (t "GDI32.dll"))
(cffi:use-foreign-library gdi32)

(cffi:defcfun ("RoundRect" round-rect :convention :stdcall) :int32
  (hdc :pointer)   ; HDC
  (left :int32)   ; INT
  (top :int32)   ; INT
  (right :int32)   ; INT
  (bottom :int32)   ; INT
  (width :int32)   ; INT
  (height :int32))   ; INT
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $RoundRect = Win32::API::More->new('GDI32',
    'BOOL RoundRect(HANDLE hdc, int left, int top, int right, int bottom, int width, int height)');
# my $ret = $RoundRect->Call($hdc, $left, $top, $right, $bottom, $width, $height);
# hdc : HDC -> HANDLE
# left : INT -> int
# top : INT -> int
# right : INT -> int
# bottom : INT -> int
# width : INT -> int
# height : INT -> int
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。