GetMonitorContrast

// dxva2.dll
#include <windows.h>

INT GetMonitorContrast(
    HANDLE hMonitor,
    DWORD* pdwMinimumContrast,
    DWORD* pdwCurrentContrast,
    DWORD* pdwMaximumContrast
);

<DllImport("dxva2.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetMonitorContrast(
    hMonitor As IntPtr,   ' HANDLE
    <Out> ByRef pdwMinimumContrast As UInteger,   ' DWORD* out
    <Out> ByRef pdwCurrentContrast As UInteger,   ' DWORD* out
    <Out> ByRef pdwMaximumContrast As UInteger   ' DWORD* out
) As Integer
End Function

' hMonitor : HANDLE
' pdwMinimumContrast : DWORD* out
' pdwCurrentContrast : DWORD* out
' pdwMaximumContrast : DWORD* out
Declare PtrSafe Function GetMonitorContrast Lib "dxva2" ( _
    ByVal hMonitor As LongPtr, _
    ByRef pdwMinimumContrast As Long, _
    ByRef pdwCurrentContrast As Long, _
    ByRef pdwMaximumContrast 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

GetMonitorContrast = ctypes.windll.dxva2.GetMonitorContrast
GetMonitorContrast.restype = ctypes.c_int
GetMonitorContrast.argtypes = [
    wintypes.HANDLE,  # hMonitor : HANDLE
    ctypes.POINTER(wintypes.DWORD),  # pdwMinimumContrast : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # pdwCurrentContrast : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # pdwMaximumContrast : DWORD* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dxva2.dll')
GetMonitorContrast = Fiddle::Function.new(
  lib['GetMonitorContrast'],
  [
    Fiddle::TYPE_VOIDP,  # hMonitor : HANDLE
    Fiddle::TYPE_VOIDP,  # pdwMinimumContrast : DWORD* out
    Fiddle::TYPE_VOIDP,  # pdwCurrentContrast : DWORD* out
    Fiddle::TYPE_VOIDP,  # pdwMaximumContrast : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "dxva2")]
extern "system" {
    fn GetMonitorContrast(
        hMonitor: *mut core::ffi::c_void,  // HANDLE
        pdwMinimumContrast: *mut u32,  // DWORD* out
        pdwCurrentContrast: *mut u32,  // DWORD* out
        pdwMaximumContrast: *mut u32  // DWORD* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dxva2.dll", SetLastError = true)]
public static extern int GetMonitorContrast(IntPtr hMonitor, out uint pdwMinimumContrast, out uint pdwCurrentContrast, out uint pdwMaximumContrast);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dxva2_GetMonitorContrast' -Namespace Win32 -PassThru
# $api::GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)

#uselib "dxva2.dll"
#func global GetMonitorContrast "GetMonitorContrast" sptr, sptr, sptr, sptr
; GetMonitorContrast hMonitor, varptr(pdwMinimumContrast), varptr(pdwCurrentContrast), varptr(pdwMaximumContrast)   ; 戻り値は stat
; hMonitor : HANDLE -> "sptr"
; pdwMinimumContrast : DWORD* out -> "sptr"
; pdwCurrentContrast : DWORD* out -> "sptr"
; pdwMaximumContrast : DWORD* 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 (
	dxva2 = windows.NewLazySystemDLL("dxva2.dll")
	procGetMonitorContrast = dxva2.NewProc("GetMonitorContrast")
)

// hMonitor (HANDLE), pdwMinimumContrast (DWORD* out), pdwCurrentContrast (DWORD* out), pdwMaximumContrast (DWORD* out)
r1, _, err := procGetMonitorContrast.Call(
	uintptr(hMonitor),
	uintptr(pdwMinimumContrast),
	uintptr(pdwCurrentContrast),
	uintptr(pdwMaximumContrast),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetMonitorContrast(
  hMonitor: THandle;   // HANDLE
  pdwMinimumContrast: Pointer;   // DWORD* out
  pdwCurrentContrast: Pointer;   // DWORD* out
  pdwMaximumContrast: Pointer   // DWORD* out
): Integer; stdcall;
  external 'dxva2.dll' name 'GetMonitorContrast';

result := DllCall("dxva2\GetMonitorContrast"
    , "Ptr", hMonitor   ; HANDLE
    , "Ptr", pdwMinimumContrast   ; DWORD* out
    , "Ptr", pdwCurrentContrast   ; DWORD* out
    , "Ptr", pdwMaximumContrast   ; DWORD* out
    , "Int")   ; return: INT

●GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast) = DLL("dxva2.dll", "int GetMonitorContrast(void*, void*, void*, void*)")
# 呼び出し: GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)
# hMonitor : HANDLE -> "void*"
# pdwMinimumContrast : DWORD* out -> "void*"
# pdwCurrentContrast : DWORD* out -> "void*"
# pdwMaximumContrast : DWORD* 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 "dxva2" fn GetMonitorContrast(
    hMonitor: ?*anyopaque, // HANDLE
    pdwMinimumContrast: [*c]u32, // DWORD* out
    pdwCurrentContrast: [*c]u32, // DWORD* out
    pdwMaximumContrast: [*c]u32 // DWORD* out
) callconv(std.os.windows.WINAPI) i32;

proc GetMonitorContrast(
    hMonitor: pointer,  # HANDLE
    pdwMinimumContrast: ptr uint32,  # DWORD* out
    pdwCurrentContrast: ptr uint32,  # DWORD* out
    pdwMaximumContrast: ptr uint32  # DWORD* out
): int32 {.importc: "GetMonitorContrast", stdcall, dynlib: "dxva2.dll".}

pragma(lib, "dxva2");
extern(Windows)
int GetMonitorContrast(
    void* hMonitor,   // HANDLE
    uint* pdwMinimumContrast,   // DWORD* out
    uint* pdwCurrentContrast,   // DWORD* out
    uint* pdwMaximumContrast   // DWORD* out
);

ccall((:GetMonitorContrast, "dxva2.dll"), stdcall, Int32,
      (Ptr{Cvoid}, Ptr{UInt32}, Ptr{UInt32}, Ptr{UInt32}),
      hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)
# hMonitor : HANDLE -> Ptr{Cvoid}
# pdwMinimumContrast : DWORD* out -> Ptr{UInt32}
# pdwCurrentContrast : DWORD* out -> Ptr{UInt32}
# pdwMaximumContrast : DWORD* out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t GetMonitorContrast(
    void* hMonitor,
    uint32_t* pdwMinimumContrast,
    uint32_t* pdwCurrentContrast,
    uint32_t* pdwMaximumContrast);
]]
local dxva2 = ffi.load("dxva2")
-- dxva2.GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)
-- hMonitor : HANDLE
-- pdwMinimumContrast : DWORD* out
-- pdwCurrentContrast : DWORD* out
-- pdwMaximumContrast : DWORD* 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('dxva2.dll');
const GetMonitorContrast = lib.func('__stdcall', 'GetMonitorContrast', 'int32_t', ['void *', 'uint32_t *', 'uint32_t *', 'uint32_t *']);
// GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)
// hMonitor : HANDLE -> 'void *'
// pdwMinimumContrast : DWORD* out -> 'uint32_t *'
// pdwCurrentContrast : DWORD* out -> 'uint32_t *'
// pdwMaximumContrast : DWORD* out -> 'uint32_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("dxva2.dll", {
  GetMonitorContrast: { parameters: ["pointer", "pointer", "pointer", "pointer"], result: "i32" },
});
// lib.symbols.GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)
// hMonitor : HANDLE -> "pointer"
// pdwMinimumContrast : DWORD* out -> "pointer"
// pdwCurrentContrast : DWORD* out -> "pointer"
// pdwMaximumContrast : DWORD* 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 GetMonitorContrast(
    void* hMonitor,
    uint32_t* pdwMinimumContrast,
    uint32_t* pdwCurrentContrast,
    uint32_t* pdwMaximumContrast);
C, "dxva2.dll");
// $ffi->GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast);
// hMonitor : HANDLE
// pdwMinimumContrast : DWORD* out
// pdwCurrentContrast : DWORD* out
// pdwMaximumContrast : DWORD* 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 Dxva2 extends StdCallLibrary {
    Dxva2 INSTANCE = Native.load("dxva2", Dxva2.class);
    int GetMonitorContrast(
        Pointer hMonitor,   // HANDLE
        IntByReference pdwMinimumContrast,   // DWORD* out
        IntByReference pdwCurrentContrast,   // DWORD* out
        IntByReference pdwMaximumContrast   // DWORD* out
    );
}

@[Link("dxva2")]
lib Libdxva2
  fun GetMonitorContrast = GetMonitorContrast(
    hMonitor : Void*,   # HANDLE
    pdwMinimumContrast : UInt32*,   # DWORD* out
    pdwCurrentContrast : UInt32*,   # DWORD* out
    pdwMaximumContrast : UInt32*   # DWORD* 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 GetMonitorContrastNative = Int32 Function(Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>);
typedef GetMonitorContrastDart = int Function(Pointer<Void>, Pointer<Uint32>, Pointer<Uint32>, Pointer<Uint32>);
final GetMonitorContrast = DynamicLibrary.open('dxva2.dll')
    .lookupFunction<GetMonitorContrastNative, GetMonitorContrastDart>('GetMonitorContrast');
// hMonitor : HANDLE -> Pointer<Void>
// pdwMinimumContrast : DWORD* out -> Pointer<Uint32>
// pdwCurrentContrast : DWORD* out -> Pointer<Uint32>
// pdwMaximumContrast : DWORD* out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function GetMonitorContrast(
  hMonitor: THandle;   // HANDLE
  pdwMinimumContrast: Pointer;   // DWORD* out
  pdwCurrentContrast: Pointer;   // DWORD* out
  pdwMaximumContrast: Pointer   // DWORD* out
): Integer; stdcall;
  external 'dxva2.dll' name 'GetMonitorContrast';

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

foreign import stdcall safe "GetMonitorContrast"
  c_GetMonitorContrast :: Ptr () -> Ptr Word32 -> Ptr Word32 -> Ptr Word32 -> IO Int32
-- hMonitor : HANDLE -> Ptr ()
-- pdwMinimumContrast : DWORD* out -> Ptr Word32
-- pdwCurrentContrast : DWORD* out -> Ptr Word32
-- pdwMaximumContrast : DWORD* out -> Ptr Word32
-- 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 getmonitorcontrast =
  foreign "GetMonitorContrast"
    ((ptr void) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> (ptr uint32_t) @-> returning int32_t)
(* hMonitor : HANDLE -> (ptr void) *)
(* pdwMinimumContrast : DWORD* out -> (ptr uint32_t) *)
(* pdwCurrentContrast : DWORD* out -> (ptr uint32_t) *)
(* pdwMaximumContrast : DWORD* out -> (ptr uint32_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 dxva2 (t "dxva2.dll"))
(cffi:use-foreign-library dxva2)

(cffi:defcfun ("GetMonitorContrast" get-monitor-contrast :convention :stdcall) :int32
  (h-monitor :pointer)   ; HANDLE
  (pdw-minimum-contrast :pointer)   ; DWORD* out
  (pdw-current-contrast :pointer)   ; DWORD* out
  (pdw-maximum-contrast :pointer))   ; DWORD* out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $GetMonitorContrast = Win32::API::More->new('dxva2',
    'int GetMonitorContrast(HANDLE hMonitor, LPVOID pdwMinimumContrast, LPVOID pdwCurrentContrast, LPVOID pdwMaximumContrast)');
# my $ret = $GetMonitorContrast->Call($hMonitor, $pdwMinimumContrast, $pdwCurrentContrast, $pdwMaximumContrast);
# hMonitor : HANDLE -> HANDLE
# pdwMinimumContrast : DWORD* out -> LPVOID
# pdwCurrentContrast : DWORD* out -> LPVOID
# pdwMaximumContrast : DWORD* out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。