MFCreateMediaEvent

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

HRESULT MFCreateMediaEvent(
    DWORD met,
    const GUID* guidExtendedType,
    HRESULT hrStatus,
    const PROPVARIANT* pvValue,   // optional
    IMFMediaEvent** ppEvent
);

<DllImport("MFPlat.dll", ExactSpelling:=True)>
Public Shared Function MFCreateMediaEvent(
    met As UInteger,   ' DWORD
    ByRef guidExtendedType As Guid,   ' GUID*
    hrStatus As Integer,   ' HRESULT
    pvValue As IntPtr,   ' PROPVARIANT* optional
    ppEvent As IntPtr   ' IMFMediaEvent** out
) As Integer
End Function

' met : DWORD
' guidExtendedType : GUID*
' hrStatus : HRESULT
' pvValue : PROPVARIANT* optional
' ppEvent : IMFMediaEvent** out
Declare PtrSafe Function MFCreateMediaEvent Lib "mfplat" ( _
    ByVal met As Long, _
    ByVal guidExtendedType As LongPtr, _
    ByVal hrStatus As Long, _
    ByVal pvValue As LongPtr, _
    ByVal ppEvent 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

MFCreateMediaEvent = ctypes.windll.mfplat.MFCreateMediaEvent
MFCreateMediaEvent.restype = ctypes.c_int
MFCreateMediaEvent.argtypes = [
    wintypes.DWORD,  # met : DWORD
    ctypes.c_void_p,  # guidExtendedType : GUID*
    ctypes.c_int,  # hrStatus : HRESULT
    ctypes.c_void_p,  # pvValue : PROPVARIANT* optional
    ctypes.c_void_p,  # ppEvent : IMFMediaEvent** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MFPlat.dll')
MFCreateMediaEvent = Fiddle::Function.new(
  lib['MFCreateMediaEvent'],
  [
    -Fiddle::TYPE_INT,  # met : DWORD
    Fiddle::TYPE_VOIDP,  # guidExtendedType : GUID*
    Fiddle::TYPE_INT,  # hrStatus : HRESULT
    Fiddle::TYPE_VOIDP,  # pvValue : PROPVARIANT* optional
    Fiddle::TYPE_VOIDP,  # ppEvent : IMFMediaEvent** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mfplat")]
extern "system" {
    fn MFCreateMediaEvent(
        met: u32,  // DWORD
        guidExtendedType: *const GUID,  // GUID*
        hrStatus: i32,  // HRESULT
        pvValue: *const PROPVARIANT,  // PROPVARIANT* optional
        ppEvent: *mut *mut core::ffi::c_void  // IMFMediaEvent** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MFPlat.dll")]
public static extern int MFCreateMediaEvent(uint met, ref Guid guidExtendedType, int hrStatus, IntPtr pvValue, IntPtr ppEvent);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MFPlat_MFCreateMediaEvent' -Namespace Win32 -PassThru
# $api::MFCreateMediaEvent(met, guidExtendedType, hrStatus, pvValue, ppEvent)

#uselib "MFPlat.dll"
#func global MFCreateMediaEvent "MFCreateMediaEvent" sptr, sptr, sptr, sptr, sptr
; MFCreateMediaEvent met, varptr(guidExtendedType), hrStatus, varptr(pvValue), ppEvent   ; 戻り値は stat
; met : DWORD -> "sptr"
; guidExtendedType : GUID* -> "sptr"
; hrStatus : HRESULT -> "sptr"
; pvValue : PROPVARIANT* optional -> "sptr"
; ppEvent : IMFMediaEvent** 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 MFCreateMediaEvent "MFCreateMediaEvent" int, var, int, var, sptr
; res = MFCreateMediaEvent(met, guidExtendedType, hrStatus, pvValue, ppEvent)
; met : DWORD -> "int"
; guidExtendedType : GUID* -> "var"
; hrStatus : HRESULT -> "int"
; pvValue : PROPVARIANT* optional -> "var"
; ppEvent : IMFMediaEvent** out -> "sptr"
; ※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 MFCreateMediaEvent(DWORD met, GUID* guidExtendedType, HRESULT hrStatus, PROPVARIANT* pvValue, IMFMediaEvent** ppEvent)
#uselib "MFPlat.dll"
#cfunc global MFCreateMediaEvent "MFCreateMediaEvent" int, var, int, var, intptr
; res = MFCreateMediaEvent(met, guidExtendedType, hrStatus, pvValue, ppEvent)
; met : DWORD -> "int"
; guidExtendedType : GUID* -> "var"
; hrStatus : HRESULT -> "int"
; pvValue : PROPVARIANT* optional -> "var"
; ppEvent : IMFMediaEvent** out -> "intptr"
; ※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 (
	mfplat = windows.NewLazySystemDLL("MFPlat.dll")
	procMFCreateMediaEvent = mfplat.NewProc("MFCreateMediaEvent")
)

// met (DWORD), guidExtendedType (GUID*), hrStatus (HRESULT), pvValue (PROPVARIANT* optional), ppEvent (IMFMediaEvent** out)
r1, _, err := procMFCreateMediaEvent.Call(
	uintptr(met),
	uintptr(guidExtendedType),
	uintptr(hrStatus),
	uintptr(pvValue),
	uintptr(ppEvent),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function MFCreateMediaEvent(
  met: DWORD;   // DWORD
  guidExtendedType: PGUID;   // GUID*
  hrStatus: Integer;   // HRESULT
  pvValue: Pointer;   // PROPVARIANT* optional
  ppEvent: Pointer   // IMFMediaEvent** out
): Integer; stdcall;
  external 'MFPlat.dll' name 'MFCreateMediaEvent';

result := DllCall("MFPlat\MFCreateMediaEvent"
    , "UInt", met   ; DWORD
    , "Ptr", guidExtendedType   ; GUID*
    , "Int", hrStatus   ; HRESULT
    , "Ptr", pvValue   ; PROPVARIANT* optional
    , "Ptr", ppEvent   ; IMFMediaEvent** out
    , "Int")   ; return: HRESULT

●MFCreateMediaEvent(met, guidExtendedType, hrStatus, pvValue, ppEvent) = DLL("MFPlat.dll", "int MFCreateMediaEvent(dword, void*, int, void*, void*)")
# 呼び出し: MFCreateMediaEvent(met, guidExtendedType, hrStatus, pvValue, ppEvent)
# met : DWORD -> "dword"
# guidExtendedType : GUID* -> "void*"
# hrStatus : HRESULT -> "int"
# pvValue : PROPVARIANT* optional -> "void*"
# ppEvent : IMFMediaEvent** 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)。