c# - 在C#中将主音频音量从XP更改为Windows 8

Question

我需要一些通用的方法来将主音频音量从Windows XP更改为C#中的Windows 8，因为我的应用程序将在这些OS上运行。

我已经尝试过http://www.geekpedia.com/tutorial176_Get-and-set-the-wave-sound-volume.html，但是在Windows 8下不起作用。也许它应该在Windows XP下工作。

无论如何，我需要一些兼容的方法来做到这一点。有什么线索吗？

Answer 1

所以我的解决方案是合并两个项目:

Mute/unmute, Change master volume in Windows 7 x64 with C#

http://www.geekpedia.com/tutorial176_Get-and-set-the-wave-sound-volume.html

最终代码应类似于(它使用NAudio框架)

    static class NativeMethods
    {

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


        [DllImport("winmm.dll", SetLastError = true)]
        public static extern bool PlaySound(string pszSound, IntPtr hmod, uint fdwSound);
    }

    public static class MSWindowsFriendlyNames
    {
        public static string WindowsXP { get { return "Windows XP"; } }
        public static string WindowsVista { get { return "Windows Vista"; } }
        public static string Windows7 { get { return "Windows 7"; } }
        public static string Windows8 { get { return "Windows 8"; } }
    }

    public static class SistemVolumChanger
    {
        public static void SetVolume(int value)
        {
            if (value < 0) 
                value = 0;

            if (value > 100)
                value = 100;

            var osFriendlyName = GetOSFriendlyName();

            if (osFriendlyName.Contains(MSWindowsFriendlyNames.WindowsXP))
            {
                SetVolumeForWIndowsXP(value);
            }
            else if (osFriendlyName.Contains(MSWindowsFriendlyNames.WindowsVista) || osFriendlyName.Contains(MSWindowsFriendlyNames.Windows7) || osFriendlyName.Contains(MSWindowsFriendlyNames.Windows8))
            {
                SetVolumeForWIndowsVista78(value);
            }
            else
            {
                SetVolumeForWIndowsVista78(value);
            }
        }

        public static int GetVolume()
        {
            int result = 100;
            try
            {
                MMDeviceEnumerator DevEnum = new MMDeviceEnumerator();
                MMDevice device = DevEnum.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia);
                result = (int)(device.AudioEndpointVolume.MasterVolumeLevelScalar * 100);
            }
            catch (Exception)
            { 
            }

            return result;
        }

        private static void SetVolumeForWIndowsVista78(int value)
        {
            try
            {
                MMDeviceEnumerator DevEnum = new MMDeviceEnumerator();
                MMDevice device = DevEnum.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia);

                device.AudioEndpointVolume.MasterVolumeLevelScalar = (float)value / 100.0f;
            }
            catch (Exception)
            {            
            }          
        }

        private static void SetVolumeForWIndowsXP(int value)
        {
            try
            {
                // Calculate the volume that's being set
                double newVolume = ushort.MaxValue * value / 10.0;

                uint v = ((uint)newVolume) & 0xffff;
                uint vAll = v | (v << 16);

                // Set the volume
                int retVal = NativeMethods.WaveOutSetVolume(IntPtr.Zero, vAll);
            }
            catch (Exception)
            { 
            }          
        }

        private static string GetOSFriendlyName()
        {
            string result = string.Empty;
            ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT Caption FROM Win32_OperatingSystem");
            foreach (ManagementObject os in searcher.Get())
            {
                result = os["Caption"].ToString();
                break;
            }
            return result;
        }
    }

更新＃1。 2015年
基本上，它使用NAudio框架。因此，如今 NAudio 的某些方法和属性具有其他名称。

例如

eDataFlow.eRender is now DataFlow.Render

和

eRole.eMultimedia is Role.Multimedia