GetMonitorRedGreenOrBlueGain

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

INT GetMonitorRedGreenOrBlueGain(
    HANDLE hMonitor,
    MC_GAIN_TYPE gtGainType,
    DWORD* pdwMinimumGain,
    DWORD* pdwCurrentGain,
    DWORD* pdwMaximumGain
);

<DllImport("dxva2.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function GetMonitorRedGreenOrBlueGain(
    hMonitor As IntPtr,   ' HANDLE
    gtGainType As Integer,   ' MC_GAIN_TYPE
    <Out> ByRef pdwMinimumGain As UInteger,   ' DWORD* out
    <Out> ByRef pdwCurrentGain As UInteger,   ' DWORD* out
    <Out> ByRef pdwMaximumGain As UInteger   ' DWORD* out
) As Integer
End Function

' hMonitor : HANDLE
' gtGainType : MC_GAIN_TYPE
' pdwMinimumGain : DWORD* out
' pdwCurrentGain : DWORD* out
' pdwMaximumGain : DWORD* out
Declare PtrSafe Function GetMonitorRedGreenOrBlueGain Lib "dxva2" ( _
    ByVal hMonitor As LongPtr, _
    ByVal gtGainType As Long, _
    ByRef pdwMinimumGain As Long, _
    ByRef pdwCurrentGain As Long, _
    ByRef pdwMaximumGain 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

GetMonitorRedGreenOrBlueGain = ctypes.windll.dxva2.GetMonitorRedGreenOrBlueGain
GetMonitorRedGreenOrBlueGain.restype = ctypes.c_int
GetMonitorRedGreenOrBlueGain.argtypes = [
    wintypes.HANDLE,  # hMonitor : HANDLE
    ctypes.c_int,  # gtGainType : MC_GAIN_TYPE
    ctypes.POINTER(wintypes.DWORD),  # pdwMinimumGain : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # pdwCurrentGain : DWORD* out
    ctypes.POINTER(wintypes.DWORD),  # pdwMaximumGain : DWORD* out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dxva2.dll')
GetMonitorRedGreenOrBlueGain = Fiddle::Function.new(
  lib['GetMonitorRedGreenOrBlueGain'],
  [
    Fiddle::TYPE_VOIDP,  # hMonitor : HANDLE
    Fiddle::TYPE_INT,  # gtGainType : MC_GAIN_TYPE
    Fiddle::TYPE_VOIDP,  # pdwMinimumGain : DWORD* out
    Fiddle::TYPE_VOIDP,  # pdwCurrentGain : DWORD* out
    Fiddle::TYPE_VOIDP,  # pdwMaximumGain : DWORD* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "dxva2")]
extern "system" {
    fn GetMonitorRedGreenOrBlueGain(
        hMonitor: *mut core::ffi::c_void,  // HANDLE
        gtGainType: i32,  // MC_GAIN_TYPE
        pdwMinimumGain: *mut u32,  // DWORD* out
        pdwCurrentGain: *mut u32,  // DWORD* out
        pdwMaximumGain: *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 GetMonitorRedGreenOrBlueGain(IntPtr hMonitor, int gtGainType, out uint pdwMinimumGain, out uint pdwCurrentGain, out uint pdwMaximumGain);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dxva2_GetMonitorRedGreenOrBlueGain' -Namespace Win32 -PassThru
# $api::GetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, pdwMinimumGain, pdwCurrentGain, pdwMaximumGain)

#uselib "dxva2.dll"
#func global GetMonitorRedGreenOrBlueGain "GetMonitorRedGreenOrBlueGain" sptr, sptr, sptr, sptr, sptr
; GetMonitorRedGreenOrBlueGain hMonitor, gtGainType, varptr(pdwMinimumGain), varptr(pdwCurrentGain), varptr(pdwMaximumGain)   ; 戻り値は stat
; hMonitor : HANDLE -> "sptr"
; gtGainType : MC_GAIN_TYPE -> "sptr"
; pdwMinimumGain : DWORD* out -> "sptr"
; pdwCurrentGain : DWORD* out -> "sptr"
; pdwMaximumGain : 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 GetMonitorRedGreenOrBlueGain "GetMonitorRedGreenOrBlueGain" sptr, int, var, var, var
; res = GetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, pdwMinimumGain, pdwCurrentGain, pdwMaximumGain)
; hMonitor : HANDLE -> "sptr"
; gtGainType : MC_GAIN_TYPE -> "int"
; pdwMinimumGain : DWORD* out -> "var"
; pdwCurrentGain : DWORD* out -> "var"
; pdwMaximumGain : 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 GetMonitorRedGreenOrBlueGain(HANDLE hMonitor, MC_GAIN_TYPE gtGainType, DWORD* pdwMinimumGain, DWORD* pdwCurrentGain, DWORD* pdwMaximumGain)
#uselib "dxva2.dll"
#cfunc global GetMonitorRedGreenOrBlueGain "GetMonitorRedGreenOrBlueGain" intptr, int, var, var, var
; res = GetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, pdwMinimumGain, pdwCurrentGain, pdwMaximumGain)
; hMonitor : HANDLE -> "intptr"
; gtGainType : MC_GAIN_TYPE -> "int"
; pdwMinimumGain : DWORD* out -> "var"
; pdwCurrentGain : DWORD* out -> "var"
; pdwMaximumGain : 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")
	procGetMonitorRedGreenOrBlueGain = dxva2.NewProc("GetMonitorRedGreenOrBlueGain")
)

// hMonitor (HANDLE), gtGainType (MC_GAIN_TYPE), pdwMinimumGain (DWORD* out), pdwCurrentGain (DWORD* out), pdwMaximumGain (DWORD* out)
r1, _, err := procGetMonitorRedGreenOrBlueGain.Call(
	uintptr(hMonitor),
	uintptr(gtGainType),
	uintptr(pdwMinimumGain),
	uintptr(pdwCurrentGain),
	uintptr(pdwMaximumGain),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function GetMonitorRedGreenOrBlueGain(
  hMonitor: THandle;   // HANDLE
  gtGainType: Integer;   // MC_GAIN_TYPE
  pdwMinimumGain: Pointer;   // DWORD* out
  pdwCurrentGain: Pointer;   // DWORD* out
  pdwMaximumGain: Pointer   // DWORD* out
): Integer; stdcall;
  external 'dxva2.dll' name 'GetMonitorRedGreenOrBlueGain';

result := DllCall("dxva2\GetMonitorRedGreenOrBlueGain"
    , "Ptr", hMonitor   ; HANDLE
    , "Int", gtGainType   ; MC_GAIN_TYPE
    , "Ptr", pdwMinimumGain   ; DWORD* out
    , "Ptr", pdwCurrentGain   ; DWORD* out
    , "Ptr", pdwMaximumGain   ; DWORD* out
    , "Int")   ; return: INT

●GetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, pdwMinimumGain, pdwCurrentGain, pdwMaximumGain) = DLL("dxva2.dll", "int GetMonitorRedGreenOrBlueGain(void*, int, void*, void*, void*)")
# 呼び出し: GetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, pdwMinimumGain, pdwCurrentGain, pdwMaximumGain)
# hMonitor : HANDLE -> "void*"
# gtGainType : MC_GAIN_TYPE -> "int"
# pdwMinimumGain : DWORD* out -> "void*"
# pdwCurrentGain : DWORD* out -> "void*"
# pdwMaximumGain : 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)。