[英]How to programmatically set the system volume?
如何使用 C# 应用程序更改 Windows 系统音量?
我参加聚会有点晚了,但如果您现在正在寻找,有一个 nuget 包可用( AudioSwitcher.AudioApi.CoreAudio )可以简化音频交互。 安装它,然后就像这样简单:
CoreAudioDevice defaultPlaybackDevice = new CoreAudioController().DefaultPlaybackDevice;
Debug.WriteLine("Current Volume:" + defaultPlaybackDevice.Volume);
defaultPlaybackDevice.Volume = 80;
这是代码:
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace Test
{
public class Test
{
private const int APPCOMMAND_VOLUME_MUTE = 0x80000;
private const int APPCOMMAND_VOLUME_UP = 0xA0000;
private const int APPCOMMAND_VOLUME_DOWN = 0x90000;
private const int WM_APPCOMMAND = 0x319;
[DllImport("user32.dll")]
public static extern IntPtr SendMessageW(IntPtr hWnd, int Msg,
IntPtr wParam, IntPtr lParam);
private void Mute()
{
SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,
(IntPtr)APPCOMMAND_VOLUME_MUTE);
}
private void VolDown()
{
SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,
(IntPtr)APPCOMMAND_VOLUME_DOWN);
}
private void VolUp()
{
SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,
(IntPtr)APPCOMMAND_VOLUME_UP);
}
}
}
使用 WPF 时,您需要使用new WindowInteropHelper(this).Handle
而不是this.Handle
(感谢 Alex Beals)
如果其他答案中提供的教程过于复杂,您可以使用keybd_event 函数尝试这样的实现
[DllImport("user32.dll")]
static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);
用法:
keybd_event((byte)Keys.VolumeUp, 0, 0, 0); // increase volume
keybd_event((byte)Keys.VolumeDown, 0, 0, 0); // decrease volume
如果您希望使用 Core Audio API 将其设置为精确值:
using CoreAudioApi;
public class SystemVolumeConfigurator
{
private readonly MMDeviceEnumerator _deviceEnumerator = new MMDeviceEnumerator();
private readonly MMDevice _playbackDevice;
public SystemVolumeConfigurator()
{
_playbackDevice = _deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia);
}
public int GetVolume()
{
return (int)(_playbackDevice.AudioEndpointVolume.MasterVolumeLevelScalar * 100);
}
public void SetVolume(int volumeLevel)
{
if (volumeLevel < 0 || volumeLevel > 100)
throw new ArgumentException("Volume must be between 0 and 100!");
_playbackDevice.AudioEndpointVolume.MasterVolumeLevelScalar = volumeLevel / 100.0f;
}
}
我的代码有点不同,但仍在使用 CoreAudio
下载了 pkg:nuget install AudioSwitcher.AudioApi.CoreAudio -Version 3.0.0.1
using AudioSwitcher.AudioApi.CoreAudio;
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
CoreAudioDevice defaultPlaybackDevice = new CoreAudioController().DefaultPlaybackDevice;
double vol = defaultPlaybackDevice.Volume;
defaultPlaybackDevice.Volume = defaultPlaybackDevice.Volume - 5.0;
defaultPlaybackDevice.Volume = defaultPlaybackDevice.Volume + 5.0;
}
}
您可以将这个库https://gist.github.com/sverrirs/d099b34b7f72bb4fb386添加到您的项目中并像这样更改音量;
VideoPlayerController.AudioManager.SetMasterVolume(100);
该库还包括用于更改应用程序音量、静音、获取当前音量级别等的选项。命名空间称为“视频播放器控制器”,但我在 Windows 窗体应用程序中使用它来更改系统音量并且工作正常,因此“视频播放器控制器” "部分是任意的。
C# 代码:
[Guid("5CDF2C82-841E-4546-9722-0CF74078229A"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IAudioEndpointVolume
{
int _0(); int _1(); int _2(); int _3();
int SetMasterVolumeLevelScalar(float fLevel, Guid pguidEventContext);
int _5();
int GetMasterVolumeLevelScalar(out float pfLevel);
int _7(); int _8(); int _9(); int _10(); int _11(); int _12();
}
[Guid("D666063F-1587-4E43-81F1-B948E807363F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IMMDevice
{
int Activate(ref System.Guid id, int clsCtx, int activationParams, out IAudioEndpointVolume aev);
}
[Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IMMDeviceEnumerator
{
int _0();
int GetDefaultAudioEndpoint(int dataFlow, int role, out IMMDevice endpoint);
}
[ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")] class MMDeviceEnumeratorComObject { }
public class Audio
{
private static readonly IAudioEndpointVolume _MMVolume;
static Audio()
{
var enumerator = new MMDeviceEnumeratorComObject() as IMMDeviceEnumerator;
enumerator.GetDefaultAudioEndpoint(0, 1, out IMMDevice dev);
var aevGuid = typeof(IAudioEndpointVolume).GUID;
dev.Activate(ref aevGuid, 1, 0, out _MMVolume);
}
public static int Volume
{
get
{
_MMVolume.GetMasterVolumeLevelScalar(out float level);
return (int)(level * 100);
}
set
{
_MMVolume.SetMasterVolumeLevelScalar((float)value / 100, default);
}
}
}
用法:
Audio.Volume = 50;
有关MSDN的更多信息。
此解决方案对我有用,不需要任何库
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