SinMaiLauncher/Interops/SystemAudioVolumeInterop.cs

using System.Reflection.PortableExecutable;
using System.Runtime.InteropServices;
using NAudio.CoreAudioApi;

namespace SinMaiLauncher.Interops
{
    public class SystemAudioVolumeInterop
    {
        /// <summary>
        /// 设置系统音量（0-100）
        /// </summary>
        /// <param name="value">音量百分比，范围 0-100</param>
        /// <returns>是否成功</returns>
        public static bool SetVolume(float value)
        {
            try
            {
                var setValue = value / 100f;

                // 创建 MMDeviceEnumerator 来访问音频设备
                using var enumerator = new MMDeviceEnumerator();
                // 获取默认音频输出设备
                using var device = enumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
                // 获取 AudioEndpointVolume 对象
                using var volume = device.AudioEndpointVolume;

                volume.MasterVolumeLevelScalar = setValue;

                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

        /// <summary>
        /// 获取当前系统音量（0-100）
        /// </summary>
        /// <returns>音量百分比，失败时返回 -1</returns>
        public static float? GetVolume()
        {
            try
            {
                // 创建 MMDeviceEnumerator 来访问音频设备
                using var enumerator = new MMDeviceEnumerator();
                // 获取默认音频输出设备
                using var device = enumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia);
                // 获取 AudioEndpointVolume 对象
                using var volume = device.AudioEndpointVolume;

                // 获取当前音量 (0.0f 到 1.0f)
                var currentVolume = volume.MasterVolumeLevelScalar;

                return (int)(currentVolume * 100);
            }
            catch (Exception e)
            {
                return null;
            }
        }
    }
}