CreateFX

// XAudio2_8.dll
#include <windows.h>

HRESULT CreateFX(
    const GUID* clsid,
    IUnknown** pEffect,
    const void* pInitDat,   // optional
    DWORD InitDataByteSize
);

<DllImport("XAudio2_8.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function CreateFX(
    ByRef clsid As Guid,   ' GUID*
    pEffect As IntPtr,   ' IUnknown** out
    pInitDat As IntPtr,   ' void* optional
    InitDataByteSize As UInteger   ' DWORD
) As Integer
End Function

' clsid : GUID*
' pEffect : IUnknown** out
' pInitDat : void* optional
' InitDataByteSize : DWORD
Declare PtrSafe Function CreateFX Lib "xaudio2_8" ( _
    ByVal clsid As LongPtr, _
    ByVal pEffect As LongPtr, _
    ByVal pInitDat As LongPtr, _
    ByVal InitDataByteSize 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

CreateFX = ctypes.cdll.xaudio2_8.CreateFX
CreateFX.restype = ctypes.c_int
CreateFX.argtypes = [
    ctypes.c_void_p,  # clsid : GUID*
    ctypes.c_void_p,  # pEffect : IUnknown** out
    ctypes.POINTER(None),  # pInitDat : void* optional
    wintypes.DWORD,  # InitDataByteSize : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('XAudio2_8.dll')
CreateFX = Fiddle::Function.new(
  lib['CreateFX'],
  [
    Fiddle::TYPE_VOIDP,  # clsid : GUID*
    Fiddle::TYPE_VOIDP,  # pEffect : IUnknown** out
    Fiddle::TYPE_VOIDP,  # pInitDat : void* optional
    -Fiddle::TYPE_INT,  # InitDataByteSize : DWORD
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "xaudio2_8")]
extern "C" {
    fn CreateFX(
        clsid: *const GUID,  // GUID*
        pEffect: *mut *mut core::ffi::c_void,  // IUnknown** out
        pInitDat: *const (),  // void* optional
        InitDataByteSize: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("XAudio2_8.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int CreateFX(ref Guid clsid, IntPtr pEffect, IntPtr pInitDat, uint InitDataByteSize);
"@
$api = Add-Type -MemberDefinition $sig -Name 'XAudio2_8_CreateFX' -Namespace Win32 -PassThru
# $api::CreateFX(clsid, pEffect, pInitDat, InitDataByteSize)

#uselib "XAudio2_8.dll"
#func global CreateFX "CreateFX" sptr, sptr, sptr, sptr
; CreateFX varptr(clsid), pEffect, pInitDat, InitDataByteSize   ; 戻り値は stat
; clsid : GUID* -> "sptr"
; pEffect : IUnknown** out -> "sptr"
; pInitDat : void* optional -> "sptr"
; InitDataByteSize : DWORD -> "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 "XAudio2_8.dll"
#cfunc global CreateFX "CreateFX" var, sptr, sptr, int
; res = CreateFX(clsid, pEffect, pInitDat, InitDataByteSize)
; clsid : GUID* -> "var"
; pEffect : IUnknown** out -> "sptr"
; pInitDat : void* optional -> "sptr"
; InitDataByteSize : DWORD -> "int"
; ※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 CreateFX(GUID* clsid, IUnknown** pEffect, void* pInitDat, DWORD InitDataByteSize)
#uselib "XAudio2_8.dll"
#cfunc global CreateFX "CreateFX" var, intptr, intptr, int
; res = CreateFX(clsid, pEffect, pInitDat, InitDataByteSize)
; clsid : GUID* -> "var"
; pEffect : IUnknown** out -> "intptr"
; pInitDat : void* optional -> "intptr"
; InitDataByteSize : DWORD -> "int"
; ※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 (
	xaudio2_8 = windows.NewLazySystemDLL("XAudio2_8.dll")
	procCreateFX = xaudio2_8.NewProc("CreateFX")
)

// clsid (GUID*), pEffect (IUnknown** out), pInitDat (void* optional), InitDataByteSize (DWORD)
r1, _, err := procCreateFX.Call(
	uintptr(clsid),
	uintptr(pEffect),
	uintptr(pInitDat),
	uintptr(InitDataByteSize),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CreateFX(
  clsid: PGUID;   // GUID*
  pEffect: Pointer;   // IUnknown** out
  pInitDat: Pointer;   // void* optional
  InitDataByteSize: DWORD   // DWORD
): Integer; cdecl;
  external 'XAudio2_8.dll' name 'CreateFX';

result := DllCall("XAudio2_8\CreateFX"
    , "Ptr", clsid   ; GUID*
    , "Ptr", pEffect   ; IUnknown** out
    , "Ptr", pInitDat   ; void* optional
    , "UInt", InitDataByteSize   ; DWORD
    , "Cdecl Int")   ; return: HRESULT

●CreateFX(clsid, pEffect, pInitDat, InitDataByteSize) = DLL("XAudio2_8.dll", "int CreateFX(void*, void*, void*, dword)")
# 呼び出し: CreateFX(clsid, pEffect, pInitDat, InitDataByteSize)
# clsid : GUID* -> "void*"
# pEffect : IUnknown** out -> "void*"
# pInitDat : void* optional -> "void*"
# InitDataByteSize : DWORD -> "dword"
# 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)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。