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MFCreateMediaBufferWrapper

関数
既存バッファーの一部範囲をラップするバッファーを生成する。
DLLMFPlat.dll呼出規約winapi対応OSWindows Vista 以降
📘 Microsoft Learn (日本語) · English

シグネチャ

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

HRESULT MFCreateMediaBufferWrapper(
    IMFMediaBuffer* pBuffer,
    DWORD cbOffset,
    DWORD dwLength,
    IMFMediaBuffer** ppBuffer
);

パラメーター

名前型方向説明
pBufferIMFMediaBuffer*inラップ対象の元 IMFMediaBuffer ポインタ。
cbOffsetDWORDin元バッファ内で参照を開始するバイトオフセット。
dwLengthDWORDinラップで参照する範囲のバイト長。
ppBufferIMFMediaBuffer**out生成されたラッパーバッファ IMFMediaBuffer を受け取る出力ポインタ。

戻り値の型: HRESULT

各言語での呼び出し定義

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

HRESULT MFCreateMediaBufferWrapper(
    IMFMediaBuffer* pBuffer,
    DWORD cbOffset,
    DWORD dwLength,
    IMFMediaBuffer** ppBuffer
);
[DllImport("MFPlat.dll", ExactSpelling = true)]
static extern int MFCreateMediaBufferWrapper(
    IntPtr pBuffer,   // IMFMediaBuffer*
    uint cbOffset,   // DWORD
    uint dwLength,   // DWORD
    IntPtr ppBuffer   // IMFMediaBuffer** out
);
<DllImport("MFPlat.dll", ExactSpelling:=True)>
Public Shared Function MFCreateMediaBufferWrapper(
    pBuffer As IntPtr,   ' IMFMediaBuffer*
    cbOffset As UInteger,   ' DWORD
    dwLength As UInteger,   ' DWORD
    ppBuffer As IntPtr   ' IMFMediaBuffer** out
) As Integer
End Function
' pBuffer : IMFMediaBuffer*
' cbOffset : DWORD
' dwLength : DWORD
' ppBuffer : IMFMediaBuffer** out
Declare PtrSafe Function MFCreateMediaBufferWrapper Lib "mfplat" ( _
    ByVal pBuffer As LongPtr, _
    ByVal cbOffset As Long, _
    ByVal dwLength As Long, _
    ByVal ppBuffer 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

MFCreateMediaBufferWrapper = ctypes.windll.mfplat.MFCreateMediaBufferWrapper
MFCreateMediaBufferWrapper.restype = ctypes.c_int
MFCreateMediaBufferWrapper.argtypes = [
    ctypes.c_void_p,  # pBuffer : IMFMediaBuffer*
    wintypes.DWORD,  # cbOffset : DWORD
    wintypes.DWORD,  # dwLength : DWORD
    ctypes.c_void_p,  # ppBuffer : IMFMediaBuffer** out
]
require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MFPlat.dll')
MFCreateMediaBufferWrapper = Fiddle::Function.new(
  lib['MFCreateMediaBufferWrapper'],
  [
    Fiddle::TYPE_VOIDP,  # pBuffer : IMFMediaBuffer*
    -Fiddle::TYPE_INT,  # cbOffset : DWORD
    -Fiddle::TYPE_INT,  # dwLength : DWORD
    Fiddle::TYPE_VOIDP,  # ppBuffer : IMFMediaBuffer** out
  ],
  Fiddle::TYPE_INT)
#[link(name = "mfplat")]
extern "system" {
    fn MFCreateMediaBufferWrapper(
        pBuffer: *mut core::ffi::c_void,  // IMFMediaBuffer*
        cbOffset: u32,  // DWORD
        dwLength: u32,  // DWORD
        ppBuffer: *mut *mut core::ffi::c_void  // IMFMediaBuffer** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.
$sig = @"
[DllImport("MFPlat.dll")]
public static extern int MFCreateMediaBufferWrapper(IntPtr pBuffer, uint cbOffset, uint dwLength, IntPtr ppBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MFPlat_MFCreateMediaBufferWrapper' -Namespace Win32 -PassThru
# $api::MFCreateMediaBufferWrapper(pBuffer, cbOffset, dwLength, ppBuffer)
#uselib "MFPlat.dll"
#func global MFCreateMediaBufferWrapper "MFCreateMediaBufferWrapper" sptr, sptr, sptr, sptr
; MFCreateMediaBufferWrapper pBuffer, cbOffset, dwLength, ppBuffer   ; 戻り値は stat
; pBuffer : IMFMediaBuffer* -> "sptr"
; cbOffset : DWORD -> "sptr"
; dwLength : DWORD -> "sptr"
; ppBuffer : IMFMediaBuffer** 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 MFCreateMediaBufferWrapper "MFCreateMediaBufferWrapper" sptr, int, int, sptr
; res = MFCreateMediaBufferWrapper(pBuffer, cbOffset, dwLength, ppBuffer)
; pBuffer : IMFMediaBuffer* -> "sptr"
; cbOffset : DWORD -> "int"
; dwLength : DWORD -> "int"
; ppBuffer : IMFMediaBuffer** out -> "sptr"
; HRESULT MFCreateMediaBufferWrapper(IMFMediaBuffer* pBuffer, DWORD cbOffset, DWORD dwLength, IMFMediaBuffer** ppBuffer)
#uselib "MFPlat.dll"
#cfunc global MFCreateMediaBufferWrapper "MFCreateMediaBufferWrapper" intptr, int, int, intptr
; res = MFCreateMediaBufferWrapper(pBuffer, cbOffset, dwLength, ppBuffer)
; pBuffer : IMFMediaBuffer* -> "intptr"
; cbOffset : DWORD -> "int"
; dwLength : DWORD -> "int"
; ppBuffer : IMFMediaBuffer** out -> "intptr"
import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	mfplat = windows.NewLazySystemDLL("MFPlat.dll")
	procMFCreateMediaBufferWrapper = mfplat.NewProc("MFCreateMediaBufferWrapper")
)

// pBuffer (IMFMediaBuffer*), cbOffset (DWORD), dwLength (DWORD), ppBuffer (IMFMediaBuffer** out)
r1, _, err := procMFCreateMediaBufferWrapper.Call(
	uintptr(pBuffer),
	uintptr(cbOffset),
	uintptr(dwLength),
	uintptr(ppBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT
function MFCreateMediaBufferWrapper(
  pBuffer: Pointer;   // IMFMediaBuffer*
  cbOffset: DWORD;   // DWORD
  dwLength: DWORD;   // DWORD
  ppBuffer: Pointer   // IMFMediaBuffer** out
): Integer; stdcall;
  external 'MFPlat.dll' name 'MFCreateMediaBufferWrapper';
result := DllCall("MFPlat\MFCreateMediaBufferWrapper"
    , "Ptr", pBuffer   ; IMFMediaBuffer*
    , "UInt", cbOffset   ; DWORD
    , "UInt", dwLength   ; DWORD
    , "Ptr", ppBuffer   ; IMFMediaBuffer** out
    , "Int")   ; return: HRESULT
●MFCreateMediaBufferWrapper(pBuffer, cbOffset, dwLength, ppBuffer) = DLL("MFPlat.dll", "int MFCreateMediaBufferWrapper(void*, dword, dword, void*)")
# 呼び出し: MFCreateMediaBufferWrapper(pBuffer, cbOffset, dwLength, ppBuffer)
# pBuffer : IMFMediaBuffer* -> "void*"
# cbOffset : DWORD -> "dword"
# dwLength : DWORD -> "dword"
# ppBuffer : IMFMediaBuffer** 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)。