DwmSetDxFrameDuration

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

HRESULT DwmSetDxFrameDuration(
    HWND hwnd,
    INT cRefreshes
);

<DllImport("dwmapi.dll", ExactSpelling:=True)>
Public Shared Function DwmSetDxFrameDuration(
    hwnd As IntPtr,   ' HWND
    cRefreshes As Integer   ' INT
) As Integer
End Function

' hwnd : HWND
' cRefreshes : INT
Declare PtrSafe Function DwmSetDxFrameDuration Lib "dwmapi" ( _
    ByVal hwnd As LongPtr, _
    ByVal cRefreshes 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

DwmSetDxFrameDuration = ctypes.windll.dwmapi.DwmSetDxFrameDuration
DwmSetDxFrameDuration.restype = ctypes.c_int
DwmSetDxFrameDuration.argtypes = [
    wintypes.HANDLE,  # hwnd : HWND
    ctypes.c_int,  # cRefreshes : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('dwmapi.dll')
DwmSetDxFrameDuration = Fiddle::Function.new(
  lib['DwmSetDxFrameDuration'],
  [
    Fiddle::TYPE_VOIDP,  # hwnd : HWND
    Fiddle::TYPE_INT,  # cRefreshes : INT
  ],
  Fiddle::TYPE_INT)

#[link(name = "dwmapi")]
extern "system" {
    fn DwmSetDxFrameDuration(
        hwnd: *mut core::ffi::c_void,  // HWND
        cRefreshes: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("dwmapi.dll")]
public static extern int DwmSetDxFrameDuration(IntPtr hwnd, int cRefreshes);
"@
$api = Add-Type -MemberDefinition $sig -Name 'dwmapi_DwmSetDxFrameDuration' -Namespace Win32 -PassThru
# $api::DwmSetDxFrameDuration(hwnd, cRefreshes)

#uselib "dwmapi.dll"
#func global DwmSetDxFrameDuration "DwmSetDxFrameDuration" sptr, sptr
; DwmSetDxFrameDuration hwnd, cRefreshes   ; 戻り値は stat
; hwnd : HWND -> "sptr"
; cRefreshes : INT -> "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 "dwmapi.dll"
#cfunc global DwmSetDxFrameDuration "DwmSetDxFrameDuration" sptr, int
; res = DwmSetDxFrameDuration(hwnd, cRefreshes)
; hwnd : HWND -> "sptr"
; cRefreshes : INT -> "int"

; HRESULT DwmSetDxFrameDuration(HWND hwnd, INT cRefreshes)
#uselib "dwmapi.dll"
#cfunc global DwmSetDxFrameDuration "DwmSetDxFrameDuration" intptr, int
; res = DwmSetDxFrameDuration(hwnd, cRefreshes)
; hwnd : HWND -> "intptr"
; cRefreshes : INT -> "int"

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

var (
	dwmapi = windows.NewLazySystemDLL("dwmapi.dll")
	procDwmSetDxFrameDuration = dwmapi.NewProc("DwmSetDxFrameDuration")
)

// hwnd (HWND), cRefreshes (INT)
r1, _, err := procDwmSetDxFrameDuration.Call(
	uintptr(hwnd),
	uintptr(cRefreshes),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function DwmSetDxFrameDuration(
  hwnd: THandle;   // HWND
  cRefreshes: Integer   // INT
): Integer; stdcall;
  external 'dwmapi.dll' name 'DwmSetDxFrameDuration';

result := DllCall("dwmapi\DwmSetDxFrameDuration"
    , "Ptr", hwnd   ; HWND
    , "Int", cRefreshes   ; INT
    , "Int")   ; return: HRESULT

●DwmSetDxFrameDuration(hwnd, cRefreshes) = DLL("dwmapi.dll", "int DwmSetDxFrameDuration(void*, int)")
# 呼び出し: DwmSetDxFrameDuration(hwnd, cRefreshes)
# hwnd : HWND -> "void*"
# cRefreshes : INT -> "int"
# 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)。