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AVIStreamReadData

関数
AVIストリームから追加ヘッダーデータを読み込む。
DLLAVIFIL32.dll呼出規約winapi対応OSWindows 2000 以降
📘 Microsoft Learn (日本語) · English

シグネチャ

// AVIFIL32.dll
#include <windows.h>

HRESULT AVIStreamReadData(
    IAVIStream* pavi,
    DWORD fcc,
    void* lp,   // optional
    INT* lpcb
);

パラメーター

名前型方向説明
paviIAVIStream*in対象のIAVIStreamインタフェースへのポインタ。
fccDWORDin読み出すデータチャンクのFOURCC識別子。
lpvoid*outoptional読み出したデータを受け取るバッファへのポインタ。
lpcbINT*inoutバッファサイズの指定および読み出しバイト数を受け取るINTへのポインタ。

戻り値の型: HRESULT

各言語での呼び出し定義

// AVIFIL32.dll
#include <windows.h>

HRESULT AVIStreamReadData(
    IAVIStream* pavi,
    DWORD fcc,
    void* lp,   // optional
    INT* lpcb
);
[DllImport("AVIFIL32.dll", ExactSpelling = true)]
static extern int AVIStreamReadData(
    IntPtr pavi,   // IAVIStream*
    uint fcc,   // DWORD
    IntPtr lp,   // void* optional, out
    ref int lpcb   // INT* in/out
);
<DllImport("AVIFIL32.dll", ExactSpelling:=True)>
Public Shared Function AVIStreamReadData(
    pavi As IntPtr,   ' IAVIStream*
    fcc As UInteger,   ' DWORD
    lp As IntPtr,   ' void* optional, out
    ByRef lpcb As Integer   ' INT* in/out
) As Integer
End Function
' pavi : IAVIStream*
' fcc : DWORD
' lp : void* optional, out
' lpcb : INT* in/out
Declare PtrSafe Function AVIStreamReadData Lib "avifil32" ( _
    ByVal pavi As LongPtr, _
    ByVal fcc As Long, _
    ByVal lp As LongPtr, _
    ByRef lpcb 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

AVIStreamReadData = ctypes.windll.avifil32.AVIStreamReadData
AVIStreamReadData.restype = ctypes.c_int
AVIStreamReadData.argtypes = [
    ctypes.c_void_p,  # pavi : IAVIStream*
    wintypes.DWORD,  # fcc : DWORD
    ctypes.POINTER(None),  # lp : void* optional, out
    ctypes.POINTER(ctypes.c_int),  # lpcb : INT* in/out
]
require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('AVIFIL32.dll')
AVIStreamReadData = Fiddle::Function.new(
  lib['AVIStreamReadData'],
  [
    Fiddle::TYPE_VOIDP,  # pavi : IAVIStream*
    -Fiddle::TYPE_INT,  # fcc : DWORD
    Fiddle::TYPE_VOIDP,  # lp : void* optional, out
    Fiddle::TYPE_VOIDP,  # lpcb : INT* in/out
  ],
  Fiddle::TYPE_INT)
#[link(name = "avifil32")]
extern "system" {
    fn AVIStreamReadData(
        pavi: *mut core::ffi::c_void,  // IAVIStream*
        fcc: u32,  // DWORD
        lp: *mut (),  // void* optional, out
        lpcb: *mut i32  // INT* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.
$sig = @"
[DllImport("AVIFIL32.dll")]
public static extern int AVIStreamReadData(IntPtr pavi, uint fcc, IntPtr lp, ref int lpcb);
"@
$api = Add-Type -MemberDefinition $sig -Name 'AVIFIL32_AVIStreamReadData' -Namespace Win32 -PassThru
# $api::AVIStreamReadData(pavi, fcc, lp, lpcb)
#uselib "AVIFIL32.dll"
#func global AVIStreamReadData "AVIStreamReadData" sptr, sptr, sptr, sptr
; AVIStreamReadData pavi, fcc, lp, varptr(lpcb)   ; 戻り値は stat
; pavi : IAVIStream* -> "sptr"
; fcc : DWORD -> "sptr"
; lp : void* optional, out -> "sptr"
; lpcb : INT* in/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 "AVIFIL32.dll"
#cfunc global AVIStreamReadData "AVIStreamReadData" sptr, int, sptr, var
; res = AVIStreamReadData(pavi, fcc, lp, lpcb)
; pavi : IAVIStream* -> "sptr"
; fcc : DWORD -> "int"
; lp : void* optional, out -> "sptr"
; lpcb : INT* in/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。
出力引数: 
; HRESULT AVIStreamReadData(IAVIStream* pavi, DWORD fcc, void* lp, INT* lpcb)
#uselib "AVIFIL32.dll"
#cfunc global AVIStreamReadData "AVIStreamReadData" intptr, int, intptr, var
; res = AVIStreamReadData(pavi, fcc, lp, lpcb)
; pavi : IAVIStream* -> "intptr"
; fcc : DWORD -> "int"
; lp : void* optional, out -> "intptr"
; lpcb : INT* in/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 (
	avifil32 = windows.NewLazySystemDLL("AVIFIL32.dll")
	procAVIStreamReadData = avifil32.NewProc("AVIStreamReadData")
)

// pavi (IAVIStream*), fcc (DWORD), lp (void* optional, out), lpcb (INT* in/out)
r1, _, err := procAVIStreamReadData.Call(
	uintptr(pavi),
	uintptr(fcc),
	uintptr(lp),
	uintptr(lpcb),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT
function AVIStreamReadData(
  pavi: Pointer;   // IAVIStream*
  fcc: DWORD;   // DWORD
  lp: Pointer;   // void* optional, out
  lpcb: Pointer   // INT* in/out
): Integer; stdcall;
  external 'AVIFIL32.dll' name 'AVIStreamReadData';
result := DllCall("AVIFIL32\AVIStreamReadData"
    , "Ptr", pavi   ; IAVIStream*
    , "UInt", fcc   ; DWORD
    , "Ptr", lp   ; void* optional, out
    , "Ptr", lpcb   ; INT* in/out
    , "Int")   ; return: HRESULT
●AVIStreamReadData(pavi, fcc, lp, lpcb) = DLL("AVIFIL32.dll", "int AVIStreamReadData(void*, dword, void*, void*)")
# 呼び出し: AVIStreamReadData(pavi, fcc, lp, lpcb)
# pavi : IAVIStream* -> "void*"
# fcc : DWORD -> "dword"
# lp : void* optional, out -> "void*"
# lpcb : INT* in/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)。