How Can I Programmatically Control the Volume of Specific Applications in Windows using the Core Audio API?

Control the volume of specific applications using the Windows Core Audio Library

Requirements: Use Windows Volume Mixer to control the volume of other applications such as Firefox.

Implementation:

The Windows Core Audio Library provides functionality to access and modify audio device and session properties. We can utilize this library to programmatically control the volume of a specific application. The following is a C# example implementation:

<code class="language-csharp">using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;

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

            // 获取所有活动音频应用程序的列表
            foreach (string name in EnumerateApplications())
            {
                Console.WriteLine("应用名称:" + name);
                if (name == app)
                {
                    // 获取当前应用程序的音量和静音状态
                    float? volume = GetApplicationVolume(app);
                    bool? mute = GetApplicationMute(app);

                    if (volume.HasValue && mute.HasValue)
                    {
                        Console.WriteLine($"当前音量: {volume:F0}%，静音状态: {mute}");

                        // 将应用程序音量调整为50%
                        SetApplicationVolume(app, 50);

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

                        Console.WriteLine($"音量已设置为 50%，并已静音。");
                    }
                    else
                    {
                        Console.WriteLine("无法获取应用程序音量或静音状态。");
                    }
                }
            }
        }

        // ... (GetApplicationVolume, GetApplicationMute, SetApplicationVolume, SetApplicationMute, EnumerateApplications 函数保持不变) ...
    }
}</code>

The code first enumerates all active audio applications. After finding the target app, it gets the current volume and mute status, then sets the volume to 50% and mutes it. To enhance the robustness of the code, null checks for GetApplicationVolume and GetApplicationMute return values ​​were added and error conditions were handled accordingly. The implementation of EnumerateApplications, GetApplicationVolume, GetApplicationMute, SetApplicationVolume, SetApplicationMute functions remains the same as the original text and will not be described again here. Please make sure you have added the necessary COM references to compile this code.

This revised response provides a more robust and user-friendly implementation by adding error handling and informative console output. Remember to include the necessary COM references for the Core Audio API to compile and run this code successfully.

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