SetVCPFeature

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

INT SetVCPFeature(
    HANDLE hMonitor,
    BYTE bVCPCode,
    DWORD dwNewValue
);

<DllImport("dxva2.dll", ExactSpelling:=True)>
Public Shared Function SetVCPFeature(
    hMonitor As IntPtr,   ' HANDLE
    bVCPCode As Byte,   ' BYTE
    dwNewValue As UInteger   ' DWORD
) As Integer
End Function

' hMonitor : HANDLE
' bVCPCode : BYTE
' dwNewValue : DWORD
Declare PtrSafe Function SetVCPFeature Lib "dxva2" ( _
    ByVal hMonitor As LongPtr, _
    ByVal bVCPCode As Byte, _
    ByVal dwNewValue 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

SetVCPFeature = ctypes.windll.dxva2.SetVCPFeature
SetVCPFeature.restype = ctypes.c_int
SetVCPFeature.argtypes = [
    wintypes.HANDLE,  # hMonitor : HANDLE
    ctypes.c_ubyte,  # bVCPCode : BYTE
    wintypes.DWORD,  # dwNewValue : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dxva2.dll')
SetVCPFeature = Fiddle::Function.new(
  lib['SetVCPFeature'],
  [
    Fiddle::TYPE_VOIDP,  # hMonitor : HANDLE
    -Fiddle::TYPE_CHAR,  # bVCPCode : BYTE
    -Fiddle::TYPE_INT,  # dwNewValue : DWORD
  ],
  Fiddle::TYPE_INT)

#[link(name = "dxva2")]
extern "system" {
    fn SetVCPFeature(
        hMonitor: *mut core::ffi::c_void,  // HANDLE
        bVCPCode: u8,  // BYTE
        dwNewValue: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dxva2.dll")]
public static extern int SetVCPFeature(IntPtr hMonitor, byte bVCPCode, uint dwNewValue);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dxva2_SetVCPFeature' -Namespace Win32 -PassThru
# $api::SetVCPFeature(hMonitor, bVCPCode, dwNewValue)

#uselib "dxva2.dll"
#func global SetVCPFeature "SetVCPFeature" sptr, sptr, sptr
; SetVCPFeature hMonitor, bVCPCode, dwNewValue   ; 戻り値は stat
; hMonitor : HANDLE -> "sptr"
; bVCPCode : BYTE -> "sptr"
; dwNewValue : 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 SetVCPFeature "SetVCPFeature" sptr, int, int
; res = SetVCPFeature(hMonitor, bVCPCode, dwNewValue)
; hMonitor : HANDLE -> "sptr"
; bVCPCode : BYTE -> "int"
; dwNewValue : DWORD -> "int"

; INT SetVCPFeature(HANDLE hMonitor, BYTE bVCPCode, DWORD dwNewValue)
#uselib "dxva2.dll"
#cfunc global SetVCPFeature "SetVCPFeature" intptr, int, int
; res = SetVCPFeature(hMonitor, bVCPCode, dwNewValue)
; hMonitor : HANDLE -> "intptr"
; bVCPCode : BYTE -> "int"
; dwNewValue : DWORD -> "int"

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

var (
	dxva2 = windows.NewLazySystemDLL("dxva2.dll")
	procSetVCPFeature = dxva2.NewProc("SetVCPFeature")
)

// hMonitor (HANDLE), bVCPCode (BYTE), dwNewValue (DWORD)
r1, _, err := procSetVCPFeature.Call(
	uintptr(hMonitor),
	uintptr(bVCPCode),
	uintptr(dwNewValue),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function SetVCPFeature(
  hMonitor: THandle;   // HANDLE
  bVCPCode: Byte;   // BYTE
  dwNewValue: DWORD   // DWORD
): Integer; stdcall;
  external 'dxva2.dll' name 'SetVCPFeature';

result := DllCall("dxva2\SetVCPFeature"
    , "Ptr", hMonitor   ; HANDLE
    , "UChar", bVCPCode   ; BYTE
    , "UInt", dwNewValue   ; DWORD
    , "Int")   ; return: INT

●SetVCPFeature(hMonitor, bVCPCode, dwNewValue) = DLL("dxva2.dll", "int SetVCPFeature(void*, byte, dword)")
# 呼び出し: SetVCPFeature(hMonitor, bVCPCode, dwNewValue)
# hMonitor : HANDLE -> "void*"
# bVCPCode : BYTE -> "byte"
# dwNewValue : 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)。