MFFrameRateToAverageTimePerFrame

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

HRESULT MFFrameRateToAverageTimePerFrame(
    DWORD unNumerator,
    DWORD unDenominator,
    ULONGLONG* punAverageTimePerFrame
);

<DllImport("MFPlat.dll", ExactSpelling:=True)>
Public Shared Function MFFrameRateToAverageTimePerFrame(
    unNumerator As UInteger,   ' DWORD
    unDenominator As UInteger,   ' DWORD
    <Out> ByRef punAverageTimePerFrame As ULong   ' ULONGLONG* out
) As Integer
End Function

' unNumerator : DWORD
' unDenominator : DWORD
' punAverageTimePerFrame : ULONGLONG* out
Declare PtrSafe Function MFFrameRateToAverageTimePerFrame Lib "mfplat" ( _
    ByVal unNumerator As Long, _
    ByVal unDenominator As Long, _
    ByRef punAverageTimePerFrame As LongLong) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MFFrameRateToAverageTimePerFrame = ctypes.windll.mfplat.MFFrameRateToAverageTimePerFrame
MFFrameRateToAverageTimePerFrame.restype = ctypes.c_int
MFFrameRateToAverageTimePerFrame.argtypes = [
    wintypes.DWORD,  # unNumerator : DWORD
    wintypes.DWORD,  # unDenominator : DWORD
    ctypes.POINTER(ctypes.c_ulonglong),  # punAverageTimePerFrame : ULONGLONG* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MFPlat.dll')
MFFrameRateToAverageTimePerFrame = Fiddle::Function.new(
  lib['MFFrameRateToAverageTimePerFrame'],
  [
    -Fiddle::TYPE_INT,  # unNumerator : DWORD
    -Fiddle::TYPE_INT,  # unDenominator : DWORD
    Fiddle::TYPE_VOIDP,  # punAverageTimePerFrame : ULONGLONG* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mfplat")]
extern "system" {
    fn MFFrameRateToAverageTimePerFrame(
        unNumerator: u32,  // DWORD
        unDenominator: u32,  // DWORD
        punAverageTimePerFrame: *mut u64  // ULONGLONG* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MFPlat.dll")]
public static extern int MFFrameRateToAverageTimePerFrame(uint unNumerator, uint unDenominator, out ulong punAverageTimePerFrame);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MFPlat_MFFrameRateToAverageTimePerFrame' -Namespace Win32 -PassThru
# $api::MFFrameRateToAverageTimePerFrame(unNumerator, unDenominator, punAverageTimePerFrame)

#uselib "MFPlat.dll"
#func global MFFrameRateToAverageTimePerFrame "MFFrameRateToAverageTimePerFrame" sptr, sptr, sptr
; MFFrameRateToAverageTimePerFrame unNumerator, unDenominator, varptr(punAverageTimePerFrame)   ; 戻り値は stat
; unNumerator : DWORD -> "sptr"
; unDenominator : DWORD -> "sptr"
; punAverageTimePerFrame : ULONGLONG* 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 "MFPlat.dll"
#cfunc global MFFrameRateToAverageTimePerFrame "MFFrameRateToAverageTimePerFrame" int, int, var
; res = MFFrameRateToAverageTimePerFrame(unNumerator, unDenominator, punAverageTimePerFrame)
; unNumerator : DWORD -> "int"
; unDenominator : DWORD -> "int"
; punAverageTimePerFrame : ULONGLONG* 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。

; HRESULT MFFrameRateToAverageTimePerFrame(DWORD unNumerator, DWORD unDenominator, ULONGLONG* punAverageTimePerFrame)
#uselib "MFPlat.dll"
#cfunc global MFFrameRateToAverageTimePerFrame "MFFrameRateToAverageTimePerFrame" int, int, var
; res = MFFrameRateToAverageTimePerFrame(unNumerator, unDenominator, punAverageTimePerFrame)
; unNumerator : DWORD -> "int"
; unDenominator : DWORD -> "int"
; punAverageTimePerFrame : ULONGLONG* 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 (
	mfplat = windows.NewLazySystemDLL("MFPlat.dll")
	procMFFrameRateToAverageTimePerFrame = mfplat.NewProc("MFFrameRateToAverageTimePerFrame")
)

// unNumerator (DWORD), unDenominator (DWORD), punAverageTimePerFrame (ULONGLONG* out)
r1, _, err := procMFFrameRateToAverageTimePerFrame.Call(
	uintptr(unNumerator),
	uintptr(unDenominator),
	uintptr(punAverageTimePerFrame),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function MFFrameRateToAverageTimePerFrame(
  unNumerator: DWORD;   // DWORD
  unDenominator: DWORD;   // DWORD
  punAverageTimePerFrame: Pointer   // ULONGLONG* out
): Integer; stdcall;
  external 'MFPlat.dll' name 'MFFrameRateToAverageTimePerFrame';

result := DllCall("MFPlat\MFFrameRateToAverageTimePerFrame"
    , "UInt", unNumerator   ; DWORD
    , "UInt", unDenominator   ; DWORD
    , "Ptr", punAverageTimePerFrame   ; ULONGLONG* out
    , "Int")   ; return: HRESULT

●MFFrameRateToAverageTimePerFrame(unNumerator, unDenominator, punAverageTimePerFrame) = DLL("MFPlat.dll", "int MFFrameRateToAverageTimePerFrame(dword, dword, void*)")
# 呼び出し: MFFrameRateToAverageTimePerFrame(unNumerator, unDenominator, punAverageTimePerFrame)
# unNumerator : DWORD -> "dword"
# unDenominator : DWORD -> "dword"
# punAverageTimePerFrame : ULONGLONG* 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)。