GdipDrawEllipse

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

Status GdipDrawEllipse(
    GpGraphics* graphics,
    GpPen* pen,
    FLOAT x,
    FLOAT y,
    FLOAT width,
    FLOAT height
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipDrawEllipse(
    graphics As IntPtr,   ' GpGraphics* in/out
    pen As IntPtr,   ' GpPen* in/out
    x As Single,   ' FLOAT
    y As Single,   ' FLOAT
    width As Single,   ' FLOAT
    height As Single   ' FLOAT
) As Integer
End Function

' graphics : GpGraphics* in/out
' pen : GpPen* in/out
' x : FLOAT
' y : FLOAT
' width : FLOAT
' height : FLOAT
Declare PtrSafe Function GdipDrawEllipse Lib "gdiplus" ( _
    ByVal graphics As LongPtr, _
    ByVal pen As LongPtr, _
    ByVal x As Single, _
    ByVal y As Single, _
    ByVal width As Single, _
    ByVal height As Single) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GdipDrawEllipse = ctypes.windll.gdiplus.GdipDrawEllipse
GdipDrawEllipse.restype = ctypes.c_int
GdipDrawEllipse.argtypes = [
    ctypes.c_void_p,  # graphics : GpGraphics* in/out
    ctypes.c_void_p,  # pen : GpPen* in/out
    ctypes.c_float,  # x : FLOAT
    ctypes.c_float,  # y : FLOAT
    ctypes.c_float,  # width : FLOAT
    ctypes.c_float,  # height : FLOAT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipDrawEllipse = Fiddle::Function.new(
  lib['GdipDrawEllipse'],
  [
    Fiddle::TYPE_VOIDP,  # graphics : GpGraphics* in/out
    Fiddle::TYPE_VOIDP,  # pen : GpPen* in/out
    Fiddle::TYPE_FLOAT,  # x : FLOAT
    Fiddle::TYPE_FLOAT,  # y : FLOAT
    Fiddle::TYPE_FLOAT,  # width : FLOAT
    Fiddle::TYPE_FLOAT,  # height : FLOAT
  ],
  Fiddle::TYPE_INT)

#[link(name = "gdiplus")]
extern "system" {
    fn GdipDrawEllipse(
        graphics: *mut GpGraphics,  // GpGraphics* in/out
        pen: *mut GpPen,  // GpPen* in/out
        x: f32,  // FLOAT
        y: f32,  // FLOAT
        width: f32,  // FLOAT
        height: f32  // FLOAT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipDrawEllipse(IntPtr graphics, IntPtr pen, float x, float y, float width, float height);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipDrawEllipse' -Namespace Win32 -PassThru
# $api::GdipDrawEllipse(graphics, pen, x, y, width, height)

#uselib "gdiplus.dll"
#func global GdipDrawEllipse "GdipDrawEllipse" sptr, sptr, float, float, float, float
; GdipDrawEllipse varptr(graphics), varptr(pen), x, y, width, height   ; 戻り値は stat
; graphics : GpGraphics* in/out -> "sptr"
; pen : GpPen* in/out -> "sptr"
; x : FLOAT -> "float"
; y : FLOAT -> "float"
; width : FLOAT -> "float"
; height : FLOAT -> "float"
; ※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 "gdiplus.dll"
#cfunc global GdipDrawEllipse "GdipDrawEllipse" var, var, float, float, float, float
; res = GdipDrawEllipse(graphics, pen, x, y, width, height)
; graphics : GpGraphics* in/out -> "var"
; pen : GpPen* in/out -> "var"
; x : FLOAT -> "float"
; y : FLOAT -> "float"
; width : FLOAT -> "float"
; height : FLOAT -> "float"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; Status GdipDrawEllipse(GpGraphics* graphics, GpPen* pen, FLOAT x, FLOAT y, FLOAT width, FLOAT height)
#uselib "gdiplus.dll"
#cfunc global GdipDrawEllipse "GdipDrawEllipse" var, var, float, float, float, float
; res = GdipDrawEllipse(graphics, pen, x, y, width, height)
; graphics : GpGraphics* in/out -> "var"
; pen : GpPen* in/out -> "var"
; x : FLOAT -> "float"
; y : FLOAT -> "float"
; width : FLOAT -> "float"
; height : FLOAT -> "float"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	gdiplus = windows.NewLazySystemDLL("gdiplus.dll")
	procGdipDrawEllipse = gdiplus.NewProc("GdipDrawEllipse")
)

// graphics (GpGraphics* in/out), pen (GpPen* in/out), x (FLOAT), y (FLOAT), width (FLOAT), height (FLOAT)
r1, _, err := procGdipDrawEllipse.Call(
	uintptr(graphics),
	uintptr(pen),
	uintptr(math.Float32bits(x)),
	uintptr(math.Float32bits(y)),
	uintptr(math.Float32bits(width)),
	uintptr(math.Float32bits(height)),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status
// 注意: float/double 引数は proc.Call では XMM レジスタに渡せません。
// windows.SyscallN(proc.Addr(), math.Float64bits(x), ...) もしくは cgo を使用してください。

function GdipDrawEllipse(
  graphics: Pointer;   // GpGraphics* in/out
  pen: Pointer;   // GpPen* in/out
  x: Single;   // FLOAT
  y: Single;   // FLOAT
  width: Single;   // FLOAT
  height: Single   // FLOAT
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipDrawEllipse';

result := DllCall("gdiplus\GdipDrawEllipse"
    , "Ptr", graphics   ; GpGraphics* in/out
    , "Ptr", pen   ; GpPen* in/out
    , "Float", x   ; FLOAT
    , "Float", y   ; FLOAT
    , "Float", width   ; FLOAT
    , "Float", height   ; FLOAT
    , "Int")   ; return: Status

●GdipDrawEllipse(graphics, pen, x, y, width, height) = DLL("gdiplus.dll", "int GdipDrawEllipse(void*, void*, float, float, float, float)")
# 呼び出し: GdipDrawEllipse(graphics, pen, x, y, width, height)
# graphics : GpGraphics* in/out -> "void*"
# pen : GpPen* in/out -> "void*"
# x : FLOAT -> "float"
# y : FLOAT -> "float"
# width : FLOAT -> "float"
# height : FLOAT -> "float"
# 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)。