MFCreateSourceReaderFromURL

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

HRESULT MFCreateSourceReaderFromURL(
    LPCWSTR pwszURL,
    IMFAttributes* pAttributes,   // optional
    IMFSourceReader** ppSourceReader
);

<DllImport("MFReadWrite.dll", ExactSpelling:=True)>
Public Shared Function MFCreateSourceReaderFromURL(
    <MarshalAs(UnmanagedType.LPWStr)> pwszURL As String,   ' LPCWSTR
    pAttributes As IntPtr,   ' IMFAttributes* optional
    ppSourceReader As IntPtr   ' IMFSourceReader** out
) As Integer
End Function

' pwszURL : LPCWSTR
' pAttributes : IMFAttributes* optional
' ppSourceReader : IMFSourceReader** out
Declare PtrSafe Function MFCreateSourceReaderFromURL Lib "mfreadwrite" ( _
    ByVal pwszURL As LongPtr, _
    ByVal pAttributes As LongPtr, _
    ByVal ppSourceReader 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

MFCreateSourceReaderFromURL = ctypes.windll.mfreadwrite.MFCreateSourceReaderFromURL
MFCreateSourceReaderFromURL.restype = ctypes.c_int
MFCreateSourceReaderFromURL.argtypes = [
    wintypes.LPCWSTR,  # pwszURL : LPCWSTR
    ctypes.c_void_p,  # pAttributes : IMFAttributes* optional
    ctypes.c_void_p,  # ppSourceReader : IMFSourceReader** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MFReadWrite.dll')
MFCreateSourceReaderFromURL = Fiddle::Function.new(
  lib['MFCreateSourceReaderFromURL'],
  [
    Fiddle::TYPE_VOIDP,  # pwszURL : LPCWSTR
    Fiddle::TYPE_VOIDP,  # pAttributes : IMFAttributes* optional
    Fiddle::TYPE_VOIDP,  # ppSourceReader : IMFSourceReader** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mfreadwrite")]
extern "system" {
    fn MFCreateSourceReaderFromURL(
        pwszURL: *const u16,  // LPCWSTR
        pAttributes: *mut core::ffi::c_void,  // IMFAttributes* optional
        ppSourceReader: *mut *mut core::ffi::c_void  // IMFSourceReader** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MFReadWrite.dll")]
public static extern int MFCreateSourceReaderFromURL([MarshalAs(UnmanagedType.LPWStr)] string pwszURL, IntPtr pAttributes, IntPtr ppSourceReader);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MFReadWrite_MFCreateSourceReaderFromURL' -Namespace Win32 -PassThru
# $api::MFCreateSourceReaderFromURL(pwszURL, pAttributes, ppSourceReader)

#uselib "MFReadWrite.dll"
#func global MFCreateSourceReaderFromURL "MFCreateSourceReaderFromURL" sptr, sptr, sptr
; MFCreateSourceReaderFromURL pwszURL, pAttributes, ppSourceReader   ; 戻り値は stat
; pwszURL : LPCWSTR -> "sptr"
; pAttributes : IMFAttributes* optional -> "sptr"
; ppSourceReader : IMFSourceReader** 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 "MFReadWrite.dll"
#cfunc global MFCreateSourceReaderFromURL "MFCreateSourceReaderFromURL" wstr, sptr, sptr
; res = MFCreateSourceReaderFromURL(pwszURL, pAttributes, ppSourceReader)
; pwszURL : LPCWSTR -> "wstr"
; pAttributes : IMFAttributes* optional -> "sptr"
; ppSourceReader : IMFSourceReader** out -> "sptr"

; HRESULT MFCreateSourceReaderFromURL(LPCWSTR pwszURL, IMFAttributes* pAttributes, IMFSourceReader** ppSourceReader)
#uselib "MFReadWrite.dll"
#cfunc global MFCreateSourceReaderFromURL "MFCreateSourceReaderFromURL" wstr, intptr, intptr
; res = MFCreateSourceReaderFromURL(pwszURL, pAttributes, ppSourceReader)
; pwszURL : LPCWSTR -> "wstr"
; pAttributes : IMFAttributes* optional -> "intptr"
; ppSourceReader : IMFSourceReader** out -> "intptr"

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

var (
	mfreadwrite = windows.NewLazySystemDLL("MFReadWrite.dll")
	procMFCreateSourceReaderFromURL = mfreadwrite.NewProc("MFCreateSourceReaderFromURL")
)

// pwszURL (LPCWSTR), pAttributes (IMFAttributes* optional), ppSourceReader (IMFSourceReader** out)
r1, _, err := procMFCreateSourceReaderFromURL.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pwszURL))),
	uintptr(pAttributes),
	uintptr(ppSourceReader),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function MFCreateSourceReaderFromURL(
  pwszURL: PWideChar;   // LPCWSTR
  pAttributes: Pointer;   // IMFAttributes* optional
  ppSourceReader: Pointer   // IMFSourceReader** out
): Integer; stdcall;
  external 'MFReadWrite.dll' name 'MFCreateSourceReaderFromURL';

result := DllCall("MFReadWrite\MFCreateSourceReaderFromURL"
    , "WStr", pwszURL   ; LPCWSTR
    , "Ptr", pAttributes   ; IMFAttributes* optional
    , "Ptr", ppSourceReader   ; IMFSourceReader** out
    , "Int")   ; return: HRESULT

●MFCreateSourceReaderFromURL(pwszURL, pAttributes, ppSourceReader) = DLL("MFReadWrite.dll", "int MFCreateSourceReaderFromURL(char*, void*, void*)")
# 呼び出し: MFCreateSourceReaderFromURL(pwszURL, pAttributes, ppSourceReader)
# pwszURL : LPCWSTR -> "char*"
# pAttributes : IMFAttributes* optional -> "void*"
# ppSourceReader : IMFSourceReader** 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)。