从powershell更改音频级别？

Question

如何使用powershell设置扬声器音量？我在这里和其他地方的网上挖不到真正找到答案.

我想我必须在C#中编写包含Win32 API的东西,然后从我的powershell脚本中调用它.Win32 API将是其中之一

[DllImport("winmm.dll")]
public static extern int waveOutGetVolume(IntPtr hwo, out uint dwVolume);

[DllImport("winmm.dll")]
public static extern int waveOutSetVolume(IntPtr hwo, uint dwVolume);

Answer 1

SendKeys在Windows 10中停止为我工作(它实际上键入了我的插入符号的数字).我发现这篇博文的方式很方便.

首先,运行此命令以访问音频API:

Add-Type -TypeDefinition @'
using System.Runtime.InteropServices;
[Guid("5CDF2C82-841E-4546-9722-0CF74078229A"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
interface IAudioEndpointVolume
{
    // f(), g(), ... are unused COM method slots. Define these if you care
    int f(); int g(); int h(); int i();
    int SetMasterVolumeLevelScalar(float fLevel, System.Guid pguidEventContext);
    int j();
    int GetMasterVolumeLevelScalar(out float pfLevel);
    int k(); int l(); int m(); int n();
    int SetMute([MarshalAs(UnmanagedType.Bool)] bool bMute, System.Guid pguidEventContext);
    int GetMute(out bool pbMute);
}
[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 f(); // Unused
    int GetDefaultAudioEndpoint(int dataFlow, int role, out IMMDevice endpoint);
}
[ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")] class MMDeviceEnumeratorComObject { }
public class Audio
{
    static IAudioEndpointVolume Vol()
    {
        var enumerator = new MMDeviceEnumeratorComObject() as IMMDeviceEnumerator;
        IMMDevice dev = null;
        Marshal.ThrowExceptionForHR(enumerator.GetDefaultAudioEndpoint(/*eRender*/ 0, /*eMultimedia*/ 1, out dev));
        IAudioEndpointVolume epv = null;
        var epvid = typeof(IAudioEndpointVolume).GUID;
        Marshal.ThrowExceptionForHR(dev.Activate(ref epvid, /*CLSCTX_ALL*/ 23, 0, out epv));
        return epv;
    }
    public static float Volume
    {
        get { float v = -1; Marshal.ThrowExceptionForHR(Vol().GetMasterVolumeLevelScalar(out v)); return v; }
        set { Marshal.ThrowExceptionForHR(Vol().SetMasterVolumeLevelScalar(value, System.Guid.Empty)); }
    }
    public static bool Mute
    {
        get { bool mute; Marshal.ThrowExceptionForHR(Vol().GetMute(out mute)); return mute; }
        set { Marshal.ThrowExceptionForHR(Vol().SetMute(value, System.Guid.Empty)); }
    }
}
'@

然后像这样控制音量:

[audio]::Volume  = 0.2 # 0.2 = 20%, etc.

并像这样静音/取消静音:

[audio]::Mute = $true  # Set to $false to un-mute

Answer 2

我创建了一个用于操作音频设备的cmdlet.

http://www.automatedops.com/projects/windowsaudiodevice-powershell-cmdlet/

它甚至包括实时峰值显示.

Answer 3

我们可以使用这些命令静音,降低音量,提高音量.1..50可以添加一个简单的循环(每个计数器= 2%的体积)来创建一个接受输入并调整音量而不需要C#的函数.

音量静音

$obj = new-object -com wscript.shell
$obj.SendKeys([char]173)

音量减小按钮

$obj = new-object -com wscript.shell
$obj.SendKeys([char]174)

音量增大按钮

$obj = new-object -com wscript.shell
$obj.SendKeys([char]175)

在此处查找相关信息.

如何从PowerShell中静音/取消静音

http://blogs.technet.com/b/heyscriptingguy/archive/2013/07/28/weekend-scripter-cheesy-script-to-set-speaker-volume.aspx

编辑:这是一个可重复使用的功能,测试和使用W7x64 w/Powershell v2.

Function Set-Speaker($Volume){$wshShell = new-object -com wscript.shell;1..50 | % {$wshShell.SendKeys([char]174)};1..$Volume | % {$wshShell.SendKeys([char]175)}}
#

用法示例.记住每个刻度是2%

#Sets volume to 60%
Set-Speaker -Volume 30

#Sets volume to 80%
Set-Speaker -Volume 40

#Sets volume to 100%
Set-Speaker -Volume 50

并且此功能将切换 - 静音

Function Toggle-Mute(){$wshShell = new-object -com wscript.shell;$wshShell.SendKeys([char]173)}
#