AUDIO_VOLUME_NOTIFICATION_DATA

using System;
using System.Runtime.InteropServices;

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct AUDIO_VOLUME_NOTIFICATION_DATA
{
    public Guid guidEventContext;
    [MarshalAs(UnmanagedType.Bool)] public bool bMuted;
    public float fMasterVolume;
    public uint nChannels;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)] public float[] afChannelVolumes;
}

Imports System.Runtime.InteropServices

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)>
Public Structure AUDIO_VOLUME_NOTIFICATION_DATA
    Public guidEventContext As Guid
    <MarshalAs(UnmanagedType.Bool)> Public bMuted As Boolean
    Public fMasterVolume As Single
    Public nChannels As UInteger
    <MarshalAs(UnmanagedType.ByValArray, SizeConst:=1)> Public afChannelVolumes() As Single
End Structure

import ctypes
from ctypes import wintypes

class AUDIO_VOLUME_NOTIFICATION_DATA(ctypes.Structure):
    _fields_ = [
        ("guidEventContext", GUID),
        ("bMuted", wintypes.BOOL),
        ("fMasterVolume", ctypes.c_float),
        ("nChannels", wintypes.DWORD),
        ("afChannelVolumes", ctypes.c_float * 1),
    ]

#[repr(C)]
pub struct AUDIO_VOLUME_NOTIFICATION_DATA {
    pub guidEventContext: GUID,
    pub bMuted: i32,
    pub fMasterVolume: f32,
    pub nChannels: u32,
    pub afChannelVolumes: [f32; 1],
}

import "golang.org/x/sys/windows"

type AUDIO_VOLUME_NOTIFICATION_DATA struct {
	guidEventContext windows.GUID
	bMuted int32
	fMasterVolume float32
	nChannels uint32
	afChannelVolumes [1]float32
}

type
  AUDIO_VOLUME_NOTIFICATION_DATA = record
    guidEventContext: TGUID;
    bMuted: BOOL;
    fMasterVolume: Single;
    nChannels: DWORD;
    afChannelVolumes: array[0..0] of Single;
  end;

const AUDIO_VOLUME_NOTIFICATION_DATA = extern struct {
    guidEventContext: GUID,
    bMuted: i32,
    fMasterVolume: f32,
    nChannels: u32,
    afChannelVolumes: [1]f32,
};

type
  AUDIO_VOLUME_NOTIFICATION_DATA {.bycopy.} = object
    guidEventContext: GUID
    bMuted: int32
    fMasterVolume: float32
    nChannels: uint32
    afChannelVolumes: array[1, float32]

struct AUDIO_VOLUME_NOTIFICATION_DATA
{
    GUID guidEventContext;
    int bMuted;
    float fMasterVolume;
    uint nChannels;
    float[1] afChannelVolumes;
}