SetMonitorRedGreenOrBlueGain

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

INT SetMonitorRedGreenOrBlueGain(
    HANDLE hMonitor,
    MC_GAIN_TYPE gtGainType,
    DWORD dwNewGain
);

<DllImport("dxva2.dll", ExactSpelling:=True)>
Public Shared Function SetMonitorRedGreenOrBlueGain(
    hMonitor As IntPtr,   ' HANDLE
    gtGainType As Integer,   ' MC_GAIN_TYPE
    dwNewGain As UInteger   ' DWORD
) As Integer
End Function

' hMonitor : HANDLE
' gtGainType : MC_GAIN_TYPE
' dwNewGain : DWORD
Declare PtrSafe Function SetMonitorRedGreenOrBlueGain Lib "dxva2" ( _
    ByVal hMonitor As LongPtr, _
    ByVal gtGainType As Long, _
    ByVal dwNewGain 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

SetMonitorRedGreenOrBlueGain = ctypes.windll.dxva2.SetMonitorRedGreenOrBlueGain
SetMonitorRedGreenOrBlueGain.restype = ctypes.c_int
SetMonitorRedGreenOrBlueGain.argtypes = [
    wintypes.HANDLE,  # hMonitor : HANDLE
    ctypes.c_int,  # gtGainType : MC_GAIN_TYPE
    wintypes.DWORD,  # dwNewGain : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dxva2.dll')
SetMonitorRedGreenOrBlueGain = Fiddle::Function.new(
  lib['SetMonitorRedGreenOrBlueGain'],
  [
    Fiddle::TYPE_VOIDP,  # hMonitor : HANDLE
    Fiddle::TYPE_INT,  # gtGainType : MC_GAIN_TYPE
    -Fiddle::TYPE_INT,  # dwNewGain : DWORD
  ],
  Fiddle::TYPE_INT)

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

$sig = @"
[DllImport("dxva2.dll")]
public static extern int SetMonitorRedGreenOrBlueGain(IntPtr hMonitor, int gtGainType, uint dwNewGain);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dxva2_SetMonitorRedGreenOrBlueGain' -Namespace Win32 -PassThru
# $api::SetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, dwNewGain)

#uselib "dxva2.dll"
#func global SetMonitorRedGreenOrBlueGain "SetMonitorRedGreenOrBlueGain" sptr, sptr, sptr
; SetMonitorRedGreenOrBlueGain hMonitor, gtGainType, dwNewGain   ; 戻り値は stat
; hMonitor : HANDLE -> "sptr"
; gtGainType : MC_GAIN_TYPE -> "sptr"
; dwNewGain : DWORD -> "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 SetMonitorRedGreenOrBlueGain "SetMonitorRedGreenOrBlueGain" sptr, int, int
; res = SetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, dwNewGain)
; hMonitor : HANDLE -> "sptr"
; gtGainType : MC_GAIN_TYPE -> "int"
; dwNewGain : DWORD -> "int"

; INT SetMonitorRedGreenOrBlueGain(HANDLE hMonitor, MC_GAIN_TYPE gtGainType, DWORD dwNewGain)
#uselib "dxva2.dll"
#cfunc global SetMonitorRedGreenOrBlueGain "SetMonitorRedGreenOrBlueGain" intptr, int, int
; res = SetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, dwNewGain)
; hMonitor : HANDLE -> "intptr"
; gtGainType : MC_GAIN_TYPE -> "int"
; dwNewGain : DWORD -> "int"

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

var (
	dxva2 = windows.NewLazySystemDLL("dxva2.dll")
	procSetMonitorRedGreenOrBlueGain = dxva2.NewProc("SetMonitorRedGreenOrBlueGain")
)

// hMonitor (HANDLE), gtGainType (MC_GAIN_TYPE), dwNewGain (DWORD)
r1, _, err := procSetMonitorRedGreenOrBlueGain.Call(
	uintptr(hMonitor),
	uintptr(gtGainType),
	uintptr(dwNewGain),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SetMonitorRedGreenOrBlueGain(
  hMonitor: THandle;   // HANDLE
  gtGainType: Integer;   // MC_GAIN_TYPE
  dwNewGain: DWORD   // DWORD
): Integer; stdcall;
  external 'dxva2.dll' name 'SetMonitorRedGreenOrBlueGain';

result := DllCall("dxva2\SetMonitorRedGreenOrBlueGain"
    , "Ptr", hMonitor   ; HANDLE
    , "Int", gtGainType   ; MC_GAIN_TYPE
    , "UInt", dwNewGain   ; DWORD
    , "Int")   ; return: INT

●SetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, dwNewGain) = DLL("dxva2.dll", "int SetMonitorRedGreenOrBlueGain(void*, int, dword)")
# 呼び出し: SetMonitorRedGreenOrBlueGain(hMonitor, gtGainType, dwNewGain)
# hMonitor : HANDLE -> "void*"
# gtGainType : MC_GAIN_TYPE -> "int"
# dwNewGain : DWORD -> "dword"
# 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)。