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。

#uselib "dxva2.dll"
#cfunc global GetMonitorContrast "GetMonitorContrast" sptr, var, var, var
; res = GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)
; hMonitor : HANDLE -> "sptr"
; pdwMinimumContrast : DWORD* out -> "var"
; pdwCurrentContrast : DWORD* out -> "var"
; pdwMaximumContrast : 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 GetMonitorContrast(HANDLE hMonitor, DWORD* pdwMinimumContrast, DWORD* pdwCurrentContrast, DWORD* pdwMaximumContrast)
#uselib "dxva2.dll"
#cfunc global GetMonitorContrast "GetMonitorContrast" intptr, var, var, var
; res = GetMonitorContrast(hMonitor, pdwMinimumContrast, pdwCurrentContrast, pdwMaximumContrast)
; hMonitor : HANDLE -> "intptr"
; pdwMinimumContrast : DWORD* out -> "var"
; pdwCurrentContrast : DWORD* out -> "var"
; pdwMaximumContrast : 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")
	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)。