.net - Change master audio volume from XP to Windows 8 in C#

Question

I need some general method to change master audio volume from Windows XP to Windows 8 in C# because my application is going to work on those OS.

I have tried already http://www.geekpedia.com/tutorial176_Get-and-set-the-wave-sound-volume.html but it doesn't work under Windows 8. Perhaps it should work under Windows XP.

Anyway I need some compatible approach to do it. Any clue?

Answer 1

So my solutions is to combine 2 projects:

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

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

   The final code should be like (It uses NAudio framework)

       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;
           }
       }
   

Update #1. Year 2015 Basically it uses NAudio framework. So nowdays some methods and properties of NAudio have other names.

For instance

eDataFlow.eRender is now DataFlow.Render

and

eRole.eMultimedia is Role.Multimedia