How Can I Control Individual Application Volume Levels Using the Windows Volume Mixer?

Fine control of application volume: Detailed explanation of Windows Volume Mixer

Question: How to control the volume of a single application using volume mixer?

Answer:

The Windows Core Audio Library provides a way to control the volume of a specific application using a volume mixer. Here is an example C# console application demonstrating how to implement this functionality:

using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;

namespace SetAppVolume
{
    class Program
    {
        static void Main(string[] args)
        {
            const string app = "Mozilla Firefox";

            foreach (string name in EnumerateApplications())
            {
                Console.WriteLine("应用名称:" + name);
                if (name == app)
                {
                    // 显示静音状态和音量级别（相对于主音量百分比）
                    Console.WriteLine("静音:" + GetApplicationMute(app));
                    Console.WriteLine("音量:" + GetApplicationVolume(app));

                    // 静音应用程序
                    SetApplicationMute(app, true);

                    // 将音量设置为主音量的二分之一（50%）
                    SetApplicationVolume(app, 50);
                }
            }
        }

        // ... (GetApplicationVolume, GetApplicationMute, SetApplicationVolume, SetApplicationMute, EnumerateApplications 函数代码保持不变) ...
    }
}

(The codes of GetApplicationVolume, GetApplicationMute, SetApplicationVolume, SetApplicationMute, EnumerateApplications functions are omitted here because they are the same as the original code. In order to avoid redundancy, they are not repeated here. List. )

This code demonstrates how to programmatically access and modify the volume and mute status of a specified application ("Mozilla Firefox"). Note that you need to add the necessary COM references to compile and run this code. Furthermore, this example is for demonstration purposes only, and more robust error handling and user interface may be required in real applications.

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