.net – 确定窗口当前是否正在播放声音

运行以下代码：

Add-Type -TypeDefinition @'
using System;
using System.Runtime.InteropServices;

namespace Foo
{
    public class Bar
    {
        public static bool IsWindowsPlayingSound()
        {
            IMMDeviceEnumerator enumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator());
            IMMDevice speakers = enumerator.GetDefaultAudioEndpoint(EDataFlow.eRender,ERole.eMultimedia);
            IAudioMeterInformation meter = (IAudioMeterInformation)speakers.Activate(typeof(IAudioMeterInformation).GUID,IntPtr.Zero);
            float value = meter.GetPeakValue();

            // this is a bit tricky. 0 is the official "no sound" value
            // but for example,if you open a video and plays/stops with it (w/o killing the app/window/stream),// the value will not be zero,but something really small (around 1E-09)
            // so,depending on your context,it is up to you to decide
            // if you want to test for 0 or for a small value
            return value > 1E-08;
        }

        [ComImport,Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")]
        private class MMDeviceEnumerator
        {
        }

        private enum EDataFlow
        {
            eRender,eCapture,eAll,}

        private enum ERole
        {
            eConsole,eMultimedia,eCommunications,}

        [InterfaceType(ComInterfaceType.InterfaceIsIUnknown),Guid("A95664D2-9614-4F35-A746-DE8DB63617E6")]
        private interface IMMDeviceEnumerator
        {
            void NotNeeded();
            IMMDevice GetDefaultAudioEndpoint(EDataFlow dataFlow,ERole role);
            // the rest is not defined/needed
        }

        [InterfaceType(ComInterfaceType.InterfaceIsIUnknown),Guid("D666063F-1587-4E43-81F1-B948E807363F")]
        private interface IMMDevice
        {
            [return: MarshalAs(UnmanagedType.IUnknown)]
            object Activate([MarshalAs(UnmanagedType.LPStruct)] Guid iid,int dwClsCtx,IntPtr pActivationParams);
            // the rest is not defined/needed
        }

        [InterfaceType(ComInterfaceType.InterfaceIsIUnknown),Guid("C02216F6-8C67-4B5B-9D00-D008E73E0064")]
        private interface IAudioMeterInformation
        {
            float GetPeakValue();
            // the rest is not defined/needed
        }
    }
}
'@

我替换了所有var类型,因为这似乎解决了PowerShell版本2上没有编译的代码的问题.

加载后,您可以像这样检查状态：

[Foo.Bar]::IsWindowsPlayingSound()
True or False

我在PowerShell 5.1上测试了这个与Windows 10 1703一起使用的方法

但有一些警告：

this is a bit tricky. 0 is the official "no sound" value
but for example,the value will not be zero,but something really small (around 1E-09)
so,it is up to you to decide
if you want to test for 0 or for a small value

因此,如果您更改返回值> 1E-08返回值> 0视频暂停时你会得到真实的.