GdipGetPageScale

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

Status GdipGetPageScale(
    GpGraphics* graphics,
    FLOAT* scale
);

<DllImport("gdiplus.dll", ExactSpelling:=True)>
Public Shared Function GdipGetPageScale(
    graphics As IntPtr,   ' GpGraphics* in/out
    ByRef scale As Single   ' FLOAT* in/out
) As Integer
End Function

' graphics : GpGraphics* in/out
' scale : FLOAT* in/out
Declare PtrSafe Function GdipGetPageScale Lib "gdiplus" ( _
    ByVal graphics As LongPtr, _
    ByRef scale 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

GdipGetPageScale = ctypes.windll.gdiplus.GdipGetPageScale
GdipGetPageScale.restype = ctypes.c_int
GdipGetPageScale.argtypes = [
    ctypes.c_void_p,  # graphics : GpGraphics* in/out
    ctypes.POINTER(ctypes.c_float),  # scale : FLOAT* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('gdiplus.dll')
GdipGetPageScale = Fiddle::Function.new(
  lib['GdipGetPageScale'],
  [
    Fiddle::TYPE_VOIDP,  # graphics : GpGraphics* in/out
    Fiddle::TYPE_VOIDP,  # scale : FLOAT* in/out
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("gdiplus.dll")]
public static extern int GdipGetPageScale(IntPtr graphics, ref float scale);
"@
$api = Add-Type -MemberDefinition $sig -Name 'gdiplus_GdipGetPageScale' -Namespace Win32 -PassThru
# $api::GdipGetPageScale(graphics, scale)

#uselib "gdiplus.dll"
#func global GdipGetPageScale "GdipGetPageScale" sptr, sptr
; GdipGetPageScale varptr(graphics), varptr(scale)   ; 戻り値は stat
; graphics : GpGraphics* in/out -> "sptr"
; scale : FLOAT* in/out -> "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。

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

var (
	gdiplus = windows.NewLazySystemDLL("gdiplus.dll")
	procGdipGetPageScale = gdiplus.NewProc("GdipGetPageScale")
)

// graphics (GpGraphics* in/out), scale (FLOAT* in/out)
r1, _, err := procGdipGetPageScale.Call(
	uintptr(graphics),
	uintptr(scale),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // Status

function GdipGetPageScale(
  graphics: Pointer;   // GpGraphics* in/out
  scale: Pointer   // FLOAT* in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetPageScale';

result := DllCall("gdiplus\GdipGetPageScale"
    , "Ptr", graphics   ; GpGraphics* in/out
    , "Ptr", scale   ; FLOAT* in/out
    , "Int")   ; return: Status

●GdipGetPageScale(graphics, scale) = DLL("gdiplus.dll", "int GdipGetPageScale(void*, void*)")
# 呼び出し: GdipGetPageScale(graphics, scale)
# graphics : GpGraphics* in/out -> "void*"
# scale : FLOAT* in/out -> "void*"
# 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 "gdiplus" fn GdipGetPageScale(
    graphics: [*c]GpGraphics, // GpGraphics* in/out
    scale: [*c]f32 // FLOAT* in/out
) callconv(std.os.windows.WINAPI) i32;

proc GdipGetPageScale(
    graphics: ptr GpGraphics,  # GpGraphics* in/out
    scale: ptr float32  # FLOAT* in/out
): int32 {.importc: "GdipGetPageScale", stdcall, dynlib: "gdiplus.dll".}

pragma(lib, "gdiplus");
extern(Windows)
int GdipGetPageScale(
    GpGraphics* graphics,   // GpGraphics* in/out
    float* scale   // FLOAT* in/out
);

ccall((:GdipGetPageScale, "gdiplus.dll"), stdcall, Int32,
      (Ptr{GpGraphics}, Ptr{Float32}),
      graphics, scale)
# graphics : GpGraphics* in/out -> Ptr{GpGraphics}
# scale : FLOAT* in/out -> Ptr{Float32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t GdipGetPageScale(
    void* graphics,
    float* scale);
]]
local gdiplus = ffi.load("gdiplus")
-- gdiplus.GdipGetPageScale(graphics, scale)
-- graphics : GpGraphics* in/out
-- scale : FLOAT* in/out
-- 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('gdiplus.dll');
const GdipGetPageScale = lib.func('__stdcall', 'GdipGetPageScale', 'int32_t', ['void *', 'float *']);
// GdipGetPageScale(graphics, scale)
// graphics : GpGraphics* in/out -> 'void *'
// scale : FLOAT* in/out -> 'float *'
// 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("gdiplus.dll", {
  GdipGetPageScale: { parameters: ["pointer", "pointer"], result: "i32" },
});
// lib.symbols.GdipGetPageScale(graphics, scale)
// graphics : GpGraphics* in/out -> "pointer"
// scale : FLOAT* in/out -> "pointer"
// 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 GdipGetPageScale(
    void* graphics,
    float* scale);
C, "gdiplus.dll");
// $ffi->GdipGetPageScale(graphics, scale);
// graphics : GpGraphics* in/out
// scale : FLOAT* in/out
// 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 Gdiplus extends StdCallLibrary {
    Gdiplus INSTANCE = Native.load("gdiplus", Gdiplus.class);
    int GdipGetPageScale(
        Pointer graphics,   // GpGraphics* in/out
        FloatByReference scale   // FLOAT* in/out
    );
}

@[Link("gdiplus")]
lib Libgdiplus
  fun GdipGetPageScale = GdipGetPageScale(
    graphics : GpGraphics*,   # GpGraphics* in/out
    scale : Float32*   # FLOAT* in/out
  ) : 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 GdipGetPageScaleNative = Int32 Function(Pointer<Void>, Pointer<Float>);
typedef GdipGetPageScaleDart = int Function(Pointer<Void>, Pointer<Float>);
final GdipGetPageScale = DynamicLibrary.open('gdiplus.dll')
    .lookupFunction<GdipGetPageScaleNative, GdipGetPageScaleDart>('GdipGetPageScale');
// graphics : GpGraphics* in/out -> Pointer<Void>
// scale : FLOAT* in/out -> Pointer<Float>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GdipGetPageScale(
  graphics: Pointer;   // GpGraphics* in/out
  scale: Pointer   // FLOAT* in/out
): Integer; stdcall;
  external 'gdiplus.dll' name 'GdipGetPageScale';

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

foreign import stdcall safe "GdipGetPageScale"
  c_GdipGetPageScale :: Ptr () -> Ptr CFloat -> IO Int32
-- graphics : GpGraphics* in/out -> Ptr ()
-- scale : FLOAT* in/out -> Ptr CFloat
-- 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 gdipgetpagescale =
  foreign "GdipGetPageScale"
    ((ptr void) @-> (ptr float) @-> returning int32_t)
(* graphics : GpGraphics* in/out -> (ptr void) *)
(* scale : FLOAT* in/out -> (ptr float) *)
(* 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 gdiplus (t "gdiplus.dll"))
(cffi:use-foreign-library gdiplus)

(cffi:defcfun ("GdipGetPageScale" gdip-get-page-scale :convention :stdcall) :int32
  (graphics :pointer)   ; GpGraphics* in/out
  (scale :pointer))   ; FLOAT* in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GdipGetPageScale = Win32::API::More->new('gdiplus',
    'int GdipGetPageScale(LPVOID graphics, LPVOID scale)');
# my $ret = $GdipGetPageScale->Call($graphics, $scale);
# graphics : GpGraphics* in/out -> LPVOID
# scale : FLOAT* in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。