ホーム › Media.MediaFoundation › MFAddPeriodicCallback

MFAddPeriodicCallback

関数

一定周期で呼び出される定期コールバックを登録する。

DLLMFPlat.dll呼出規約winapi対応OSWindows Vista 以降

シグネチャ

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

HRESULT MFAddPeriodicCallback(
    MFPERIODICCALLBACK Callback,
    IUnknown* pContext,
    DWORD* pdwKey   // optional
);

パラメーター

名前	型	方向
Callback	MFPERIODICCALLBACK	in
pContext	IUnknown*	in
pdwKey	DWORD*	outoptional

戻り値の型: HRESULT

各言語での呼び出し定義

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

HRESULT MFAddPeriodicCallback(
    MFPERIODICCALLBACK Callback,
    IUnknown* pContext,
    DWORD* pdwKey   // optional
);

[DllImport("MFPlat.dll", ExactSpelling = true)]
static extern int MFAddPeriodicCallback(
    IntPtr Callback,   // MFPERIODICCALLBACK
    IntPtr pContext,   // IUnknown*
    IntPtr pdwKey   // DWORD* optional, out
);

<DllImport("MFPlat.dll", ExactSpelling:=True)>
Public Shared Function MFAddPeriodicCallback(
    Callback As IntPtr,   ' MFPERIODICCALLBACK
    pContext As IntPtr,   ' IUnknown*
    pdwKey As IntPtr   ' DWORD* optional, out
) As Integer
End Function

' Callback : MFPERIODICCALLBACK
' pContext : IUnknown*
' pdwKey : DWORD* optional, out
Declare PtrSafe Function MFAddPeriodicCallback Lib "mfplat" ( _
    ByVal Callback As LongPtr, _
    ByVal pContext As LongPtr, _
    ByVal pdwKey As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MFAddPeriodicCallback = ctypes.windll.mfplat.MFAddPeriodicCallback
MFAddPeriodicCallback.restype = ctypes.c_int
MFAddPeriodicCallback.argtypes = [
    ctypes.c_void_p,  # Callback : MFPERIODICCALLBACK
    ctypes.c_void_p,  # pContext : IUnknown*
    ctypes.POINTER(wintypes.DWORD),  # pdwKey : DWORD* optional, out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MFPlat.dll')
MFAddPeriodicCallback = Fiddle::Function.new(
  lib['MFAddPeriodicCallback'],
  [
    Fiddle::TYPE_VOIDP,  # Callback : MFPERIODICCALLBACK
    Fiddle::TYPE_VOIDP,  # pContext : IUnknown*
    Fiddle::TYPE_VOIDP,  # pdwKey : DWORD* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mfplat")]
extern "system" {
    fn MFAddPeriodicCallback(
        Callback: *const core::ffi::c_void,  // MFPERIODICCALLBACK
        pContext: *mut core::ffi::c_void,  // IUnknown*
        pdwKey: *mut u32  // DWORD* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MFPlat.dll")]
public static extern int MFAddPeriodicCallback(IntPtr Callback, IntPtr pContext, IntPtr pdwKey);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MFPlat_MFAddPeriodicCallback' -Namespace Win32 -PassThru
# $api::MFAddPeriodicCallback(Callback, pContext, pdwKey)

#uselib "MFPlat.dll"
#func global MFAddPeriodicCallback "MFAddPeriodicCallback" sptr, sptr, sptr
; MFAddPeriodicCallback Callback, pContext, varptr(pdwKey)   ; 戻り値は stat
; Callback : MFPERIODICCALLBACK -> "sptr"
; pContext : IUnknown* -> "sptr"
; pdwKey : DWORD* optional, 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。

出力引数:

#uselib "MFPlat.dll"
#cfunc global MFAddPeriodicCallback "MFAddPeriodicCallback" sptr, sptr, var
; res = MFAddPeriodicCallback(Callback, pContext, pdwKey)
; Callback : MFPERIODICCALLBACK -> "sptr"
; pContext : IUnknown* -> "sptr"
; pdwKey : DWORD* optional, 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。#uselib "MFPlat.dll"
#cfunc global MFAddPeriodicCallback "MFAddPeriodicCallback" sptr, sptr, sptr
; res = MFAddPeriodicCallback(Callback, pContext, varptr(pdwKey))
; Callback : MFPERIODICCALLBACK -> "sptr"
; pContext : IUnknown* -> "sptr"
; pdwKey : DWORD* optional, out -> "sptr"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; HRESULT MFAddPeriodicCallback(MFPERIODICCALLBACK Callback, IUnknown* pContext, DWORD* pdwKey)
#uselib "MFPlat.dll"
#cfunc global MFAddPeriodicCallback "MFAddPeriodicCallback" intptr, intptr, var
; res = MFAddPeriodicCallback(Callback, pContext, pdwKey)
; Callback : MFPERIODICCALLBACK -> "intptr"
; pContext : IUnknown* -> "intptr"
; pdwKey : DWORD* optional, 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 MFAddPeriodicCallback(MFPERIODICCALLBACK Callback, IUnknown* pContext, DWORD* pdwKey)
#uselib "MFPlat.dll"
#cfunc global MFAddPeriodicCallback "MFAddPeriodicCallback" intptr, intptr, intptr
; res = MFAddPeriodicCallback(Callback, pContext, varptr(pdwKey))
; Callback : MFPERIODICCALLBACK -> "intptr"
; pContext : IUnknown* -> "intptr"
; pdwKey : DWORD* optional, out -> "intptr"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	mfplat = windows.NewLazySystemDLL("MFPlat.dll")
	procMFAddPeriodicCallback = mfplat.NewProc("MFAddPeriodicCallback")
)

// Callback (MFPERIODICCALLBACK), pContext (IUnknown*), pdwKey (DWORD* optional, out)
r1, _, err := procMFAddPeriodicCallback.Call(
	uintptr(Callback),
	uintptr(pContext),
	uintptr(pdwKey),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function MFAddPeriodicCallback(
  Callback: Pointer;   // MFPERIODICCALLBACK
  pContext: Pointer;   // IUnknown*
  pdwKey: Pointer   // DWORD* optional, out
): Integer; stdcall;
  external 'MFPlat.dll' name 'MFAddPeriodicCallback';

result := DllCall("MFPlat\MFAddPeriodicCallback"
    , "Ptr", Callback   ; MFPERIODICCALLBACK
    , "Ptr", pContext   ; IUnknown*
    , "Ptr", pdwKey   ; DWORD* optional, out
    , "Int")   ; return: HRESULT

●MFAddPeriodicCallback(Callback, pContext, pdwKey) = DLL("MFPlat.dll", "int MFAddPeriodicCallback(void*, void*, void*)")
# 呼び出し: MFAddPeriodicCallback(Callback, pContext, pdwKey)
# Callback : MFPERIODICCALLBACK -> "void*"
# pContext : IUnknown* -> "void*"
# pdwKey : DWORD* optional, 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)。