MFCreateMemoryBuffer

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

HRESULT MFCreateMemoryBuffer(
    DWORD cbMaxLength,
    IMFMediaBuffer** ppBuffer
);

<DllImport("MFPlat.dll", ExactSpelling:=True)>
Public Shared Function MFCreateMemoryBuffer(
    cbMaxLength As UInteger,   ' DWORD
    ppBuffer As IntPtr   ' IMFMediaBuffer** out
) As Integer
End Function

' cbMaxLength : DWORD
' ppBuffer : IMFMediaBuffer** out
Declare PtrSafe Function MFCreateMemoryBuffer Lib "mfplat" ( _
    ByVal cbMaxLength 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

MFCreateMemoryBuffer = ctypes.windll.mfplat.MFCreateMemoryBuffer
MFCreateMemoryBuffer.restype = ctypes.c_int
MFCreateMemoryBuffer.argtypes = [
    wintypes.DWORD,  # cbMaxLength : DWORD
    ctypes.c_void_p,  # ppBuffer : IMFMediaBuffer** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MFPlat.dll')
MFCreateMemoryBuffer = Fiddle::Function.new(
  lib['MFCreateMemoryBuffer'],
  [
    -Fiddle::TYPE_INT,  # cbMaxLength : DWORD
    Fiddle::TYPE_VOIDP,  # ppBuffer : IMFMediaBuffer** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mfplat")]
extern "system" {
    fn MFCreateMemoryBuffer(
        cbMaxLength: 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 MFCreateMemoryBuffer(uint cbMaxLength, IntPtr ppBuffer);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MFPlat_MFCreateMemoryBuffer' -Namespace Win32 -PassThru
# $api::MFCreateMemoryBuffer(cbMaxLength, ppBuffer)

#uselib "MFPlat.dll"
#func global MFCreateMemoryBuffer "MFCreateMemoryBuffer" sptr, sptr
; MFCreateMemoryBuffer cbMaxLength, ppBuffer   ; 戻り値は stat
; cbMaxLength : 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 MFCreateMemoryBuffer "MFCreateMemoryBuffer" int, sptr
; res = MFCreateMemoryBuffer(cbMaxLength, ppBuffer)
; cbMaxLength : DWORD -> "int"
; ppBuffer : IMFMediaBuffer** out -> "sptr"

; HRESULT MFCreateMemoryBuffer(DWORD cbMaxLength, IMFMediaBuffer** ppBuffer)
#uselib "MFPlat.dll"
#cfunc global MFCreateMemoryBuffer "MFCreateMemoryBuffer" int, intptr
; res = MFCreateMemoryBuffer(cbMaxLength, ppBuffer)
; cbMaxLength : DWORD -> "int"
; ppBuffer : IMFMediaBuffer** out -> "intptr"

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

var (
	mfplat = windows.NewLazySystemDLL("MFPlat.dll")
	procMFCreateMemoryBuffer = mfplat.NewProc("MFCreateMemoryBuffer")
)

// cbMaxLength (DWORD), ppBuffer (IMFMediaBuffer** out)
r1, _, err := procMFCreateMemoryBuffer.Call(
	uintptr(cbMaxLength),
	uintptr(ppBuffer),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function MFCreateMemoryBuffer(
  cbMaxLength: DWORD;   // DWORD
  ppBuffer: Pointer   // IMFMediaBuffer** out
): Integer; stdcall;
  external 'MFPlat.dll' name 'MFCreateMemoryBuffer';

result := DllCall("MFPlat\MFCreateMemoryBuffer"
    , "UInt", cbMaxLength   ; DWORD
    , "Ptr", ppBuffer   ; IMFMediaBuffer** out
    , "Int")   ; return: HRESULT

●MFCreateMemoryBuffer(cbMaxLength, ppBuffer) = DLL("MFPlat.dll", "int MFCreateMemoryBuffer(dword, void*)")
# 呼び出し: MFCreateMemoryBuffer(cbMaxLength, ppBuffer)
# cbMaxLength : 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)。

const std = @import("std");

extern "mfplat" fn MFCreateMemoryBuffer(
    cbMaxLength: u32, // DWORD
    ppBuffer: ?*anyopaque // IMFMediaBuffer** out
) callconv(std.os.windows.WINAPI) i32;

proc MFCreateMemoryBuffer(
    cbMaxLength: uint32,  # DWORD
    ppBuffer: pointer  # IMFMediaBuffer** out
): int32 {.importc: "MFCreateMemoryBuffer", stdcall, dynlib: "MFPlat.dll".}

pragma(lib, "mfplat");
extern(Windows)
int MFCreateMemoryBuffer(
    uint cbMaxLength,   // DWORD
    void* ppBuffer   // IMFMediaBuffer** out
);

ccall((:MFCreateMemoryBuffer, "MFPlat.dll"), stdcall, Int32,
      (UInt32, Ptr{Cvoid}),
      cbMaxLength, ppBuffer)
# cbMaxLength : DWORD -> UInt32
# ppBuffer : IMFMediaBuffer** out -> Ptr{Cvoid}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t MFCreateMemoryBuffer(
    uint32_t cbMaxLength,
    void* ppBuffer);
]]
local mfplat = ffi.load("mfplat")
-- mfplat.MFCreateMemoryBuffer(cbMaxLength, ppBuffer)
-- cbMaxLength : DWORD
-- ppBuffer : IMFMediaBuffer** out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('MFPlat.dll');
const MFCreateMemoryBuffer = lib.func('__stdcall', 'MFCreateMemoryBuffer', 'int32_t', ['uint32_t', 'void *']);
// MFCreateMemoryBuffer(cbMaxLength, ppBuffer)
// cbMaxLength : DWORD -> 'uint32_t'
// ppBuffer : IMFMediaBuffer** out -> 'void *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("MFPlat.dll", {
  MFCreateMemoryBuffer: { parameters: ["u32", "pointer"], result: "i32" },
});
// lib.symbols.MFCreateMemoryBuffer(cbMaxLength, ppBuffer)
// cbMaxLength : DWORD -> "u32"
// ppBuffer : IMFMediaBuffer** out -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t MFCreateMemoryBuffer(
    uint32_t cbMaxLength,
    void* ppBuffer);
C, "MFPlat.dll");
// $ffi->MFCreateMemoryBuffer(cbMaxLength, ppBuffer);
// cbMaxLength : DWORD
// ppBuffer : IMFMediaBuffer** out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Mfplat extends StdCallLibrary {
    Mfplat INSTANCE = Native.load("mfplat", Mfplat.class);
    int MFCreateMemoryBuffer(
        int cbMaxLength,   // DWORD
        Pointer ppBuffer   // IMFMediaBuffer** out
    );
}

@[Link("mfplat")]
lib LibMFPlat
  fun MFCreateMemoryBuffer = MFCreateMemoryBuffer(
    cbMaxLength : UInt32,   # DWORD
    ppBuffer : Void*   # IMFMediaBuffer** out
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef MFCreateMemoryBufferNative = Int32 Function(Uint32, Pointer<Void>);
typedef MFCreateMemoryBufferDart = int Function(int, Pointer<Void>);
final MFCreateMemoryBuffer = DynamicLibrary.open('MFPlat.dll')
    .lookupFunction<MFCreateMemoryBufferNative, MFCreateMemoryBufferDart>('MFCreateMemoryBuffer');
// cbMaxLength : DWORD -> Uint32
// ppBuffer : IMFMediaBuffer** out -> Pointer<Void>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function MFCreateMemoryBuffer(
  cbMaxLength: DWORD;   // DWORD
  ppBuffer: Pointer   // IMFMediaBuffer** out
): Integer; stdcall;
  external 'MFPlat.dll' name 'MFCreateMemoryBuffer';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "MFCreateMemoryBuffer"
  c_MFCreateMemoryBuffer :: Word32 -> Ptr () -> IO Int32
-- cbMaxLength : DWORD -> Word32
-- ppBuffer : IMFMediaBuffer** out -> Ptr ()
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let mfcreatememorybuffer =
  foreign "MFCreateMemoryBuffer"
    (uint32_t @-> (ptr void) @-> returning int32_t)
(* cbMaxLength : DWORD -> uint32_t *)
(* ppBuffer : IMFMediaBuffer** out -> (ptr void) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library mfplat (t "MFPlat.dll"))
(cffi:use-foreign-library mfplat)

(cffi:defcfun ("MFCreateMemoryBuffer" mfcreate-memory-buffer :convention :stdcall) :int32
  (cb-max-length :uint32)   ; DWORD
  (pp-buffer :pointer))   ; IMFMediaBuffer** out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $MFCreateMemoryBuffer = Win32::API::More->new('MFPlat',
    'int MFCreateMemoryBuffer(DWORD cbMaxLength, LPVOID ppBuffer)');
# my $ret = $MFCreateMemoryBuffer->Call($cbMaxLength, $ppBuffer);
# cbMaxLength : DWORD -> DWORD
# ppBuffer : IMFMediaBuffer** out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。