GetMonitorBrightness

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

INT GetMonitorBrightness(
    HANDLE hMonitor,
    DWORD* pdwMinimumBrightness,
    DWORD* pdwCurrentBrightness,
    DWORD* pdwMaximumBrightness
);

<DllImport("dxva2.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetMonitorBrightness(
    hMonitor As IntPtr,   ' HANDLE
    <Out> ByRef pdwMinimumBrightness As UInteger,   ' DWORD* out
    <Out> ByRef pdwCurrentBrightness As UInteger,   ' DWORD* out
    <Out> ByRef pdwMaximumBrightness As UInteger   ' DWORD* out
) As Integer
End Function

' hMonitor : HANDLE
' pdwMinimumBrightness : DWORD* out
' pdwCurrentBrightness : DWORD* out
' pdwMaximumBrightness : DWORD* out
Declare PtrSafe Function GetMonitorBrightness Lib "dxva2" ( _
    ByVal hMonitor As LongPtr, _
    ByRef pdwMinimumBrightness As Long, _
    ByRef pdwCurrentBrightness As Long, _
    ByRef pdwMaximumBrightness 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

GetMonitorBrightness = ctypes.windll.dxva2.GetMonitorBrightness
GetMonitorBrightness.restype = ctypes.c_int
GetMonitorBrightness.argtypes = [
    wintypes.HANDLE,  # hMonitor : HANDLE
    ctypes.POINTER(wintypes.DWORD),  # pdwMinimumBrightness : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # pdwCurrentBrightness : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # pdwMaximumBrightness : DWORD* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dxva2.dll')
GetMonitorBrightness = Fiddle::Function.new(
  lib['GetMonitorBrightness'],
  [
    Fiddle::TYPE_VOIDP,  # hMonitor : HANDLE
    Fiddle::TYPE_VOIDP,  # pdwMinimumBrightness : DWORD* out
    Fiddle::TYPE_VOIDP,  # pdwCurrentBrightness : DWORD* out
    Fiddle::TYPE_VOIDP,  # pdwMaximumBrightness : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "dxva2")]
extern "system" {
    fn GetMonitorBrightness(
        hMonitor: *mut core::ffi::c_void,  // HANDLE
        pdwMinimumBrightness: *mut u32,  // DWORD* out
        pdwCurrentBrightness: *mut u32,  // DWORD* out
        pdwMaximumBrightness: *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 GetMonitorBrightness(IntPtr hMonitor, out uint pdwMinimumBrightness, out uint pdwCurrentBrightness, out uint pdwMaximumBrightness);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dxva2_GetMonitorBrightness' -Namespace Win32 -PassThru
# $api::GetMonitorBrightness(hMonitor, pdwMinimumBrightness, pdwCurrentBrightness, pdwMaximumBrightness)

#uselib "dxva2.dll"
#func global GetMonitorBrightness "GetMonitorBrightness" sptr, sptr, sptr, sptr
; GetMonitorBrightness hMonitor, varptr(pdwMinimumBrightness), varptr(pdwCurrentBrightness), varptr(pdwMaximumBrightness)   ; 戻り値は stat
; hMonitor : HANDLE -> "sptr"
; pdwMinimumBrightness : DWORD* out -> "sptr"
; pdwCurrentBrightness : DWORD* out -> "sptr"
; pdwMaximumBrightness : 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。

#uselib "dxva2.dll"
#cfunc global GetMonitorBrightness "GetMonitorBrightness" sptr, var, var, var
; res = GetMonitorBrightness(hMonitor, pdwMinimumBrightness, pdwCurrentBrightness, pdwMaximumBrightness)
; hMonitor : HANDLE -> "sptr"
; pdwMinimumBrightness : DWORD* out -> "var"
; pdwCurrentBrightness : DWORD* out -> "var"
; pdwMaximumBrightness : DWORD* out -> "var"
; ※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。

; INT GetMonitorBrightness(HANDLE hMonitor, DWORD* pdwMinimumBrightness, DWORD* pdwCurrentBrightness, DWORD* pdwMaximumBrightness)
#uselib "dxva2.dll"
#cfunc global GetMonitorBrightness "GetMonitorBrightness" intptr, var, var, var
; res = GetMonitorBrightness(hMonitor, pdwMinimumBrightness, pdwCurrentBrightness, pdwMaximumBrightness)
; hMonitor : HANDLE -> "intptr"
; pdwMinimumBrightness : DWORD* out -> "var"
; pdwCurrentBrightness : DWORD* out -> "var"
; pdwMaximumBrightness : DWORD* out -> "var"
; ※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 (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	dxva2 = windows.NewLazySystemDLL("dxva2.dll")
	procGetMonitorBrightness = dxva2.NewProc("GetMonitorBrightness")
)

// hMonitor (HANDLE), pdwMinimumBrightness (DWORD* out), pdwCurrentBrightness (DWORD* out), pdwMaximumBrightness (DWORD* out)
r1, _, err := procGetMonitorBrightness.Call(
	uintptr(hMonitor),
	uintptr(pdwMinimumBrightness),
	uintptr(pdwCurrentBrightness),
	uintptr(pdwMaximumBrightness),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetMonitorBrightness(
  hMonitor: THandle;   // HANDLE
  pdwMinimumBrightness: Pointer;   // DWORD* out
  pdwCurrentBrightness: Pointer;   // DWORD* out
  pdwMaximumBrightness: Pointer   // DWORD* out
): Integer; stdcall;
  external 'dxva2.dll' name 'GetMonitorBrightness';

result := DllCall("dxva2\GetMonitorBrightness"
    , "Ptr", hMonitor   ; HANDLE
    , "Ptr", pdwMinimumBrightness   ; DWORD* out
    , "Ptr", pdwCurrentBrightness   ; DWORD* out
    , "Ptr", pdwMaximumBrightness   ; DWORD* out
    , "Int")   ; return: INT

●GetMonitorBrightness(hMonitor, pdwMinimumBrightness, pdwCurrentBrightness, pdwMaximumBrightness) = DLL("dxva2.dll", "int GetMonitorBrightness(void*, void*, void*, void*)")
# 呼び出し: GetMonitorBrightness(hMonitor, pdwMinimumBrightness, pdwCurrentBrightness, pdwMaximumBrightness)
# hMonitor : HANDLE -> "void*"
# pdwMinimumBrightness : DWORD* out -> "void*"
# pdwCurrentBrightness : DWORD* out -> "void*"
# pdwMaximumBrightness : 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)。