CreateAudioVolumeMeter

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

HRESULT CreateAudioVolumeMeter(
    IUnknown** ppApo
);

<DllImport("XAudio2_8.dll", ExactSpelling:=True)>
Public Shared Function CreateAudioVolumeMeter(
    ppApo As IntPtr   ' IUnknown** out
) As Integer
End Function

' ppApo : IUnknown** out
Declare PtrSafe Function CreateAudioVolumeMeter Lib "xaudio2_8" ( _
    ByVal ppApo 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

CreateAudioVolumeMeter = ctypes.windll.xaudio2_8.CreateAudioVolumeMeter
CreateAudioVolumeMeter.restype = ctypes.c_int
CreateAudioVolumeMeter.argtypes = [
    ctypes.c_void_p,  # ppApo : IUnknown** out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('XAudio2_8.dll')
CreateAudioVolumeMeter = Fiddle::Function.new(
  lib['CreateAudioVolumeMeter'],
  [
    Fiddle::TYPE_VOIDP,  # ppApo : IUnknown** out
  ],
  Fiddle::TYPE_INT)

#[link(name = "xaudio2_8")]
extern "system" {
    fn CreateAudioVolumeMeter(
        ppApo: *mut *mut core::ffi::c_void  // IUnknown** out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("XAudio2_8.dll")]
public static extern int CreateAudioVolumeMeter(IntPtr ppApo);
"@
$api = Add-Type -MemberDefinition $sig -Name 'XAudio2_8_CreateAudioVolumeMeter' -Namespace Win32 -PassThru
# $api::CreateAudioVolumeMeter(ppApo)

#uselib "XAudio2_8.dll"
#func global CreateAudioVolumeMeter "CreateAudioVolumeMeter" sptr
; CreateAudioVolumeMeter ppApo   ; 戻り値は stat
; ppApo : IUnknown** 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 "XAudio2_8.dll"
#cfunc global CreateAudioVolumeMeter "CreateAudioVolumeMeter" sptr
; res = CreateAudioVolumeMeter(ppApo)
; ppApo : IUnknown** out -> "sptr"

; HRESULT CreateAudioVolumeMeter(IUnknown** ppApo)
#uselib "XAudio2_8.dll"
#cfunc global CreateAudioVolumeMeter "CreateAudioVolumeMeter" intptr
; res = CreateAudioVolumeMeter(ppApo)
; ppApo : IUnknown** out -> "intptr"

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

var (
	xaudio2_8 = windows.NewLazySystemDLL("XAudio2_8.dll")
	procCreateAudioVolumeMeter = xaudio2_8.NewProc("CreateAudioVolumeMeter")
)

// ppApo (IUnknown** out)
r1, _, err := procCreateAudioVolumeMeter.Call(
	uintptr(ppApo),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CreateAudioVolumeMeter(
  ppApo: Pointer   // IUnknown** out
): Integer; stdcall;
  external 'XAudio2_8.dll' name 'CreateAudioVolumeMeter';

result := DllCall("XAudio2_8\CreateAudioVolumeMeter"
    , "Ptr", ppApo   ; IUnknown** out
    , "Int")   ; return: HRESULT

●CreateAudioVolumeMeter(ppApo) = DLL("XAudio2_8.dll", "int CreateAudioVolumeMeter(void*)")
# 呼び出し: CreateAudioVolumeMeter(ppApo)
# ppApo : IUnknown** 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)。