Change SYSTEM volume level in windows

Question

My application needs to be able to change system volume levels for sound devices. I'm using C# with NAudio. I tried using CoreAudio Api in NAudio, but this don't work in Windows XP, however my program needs to support XP. Please help me, what do I need to use, to get my program to support XP as well as the latest Windows.

NAudio also includes wrappers for the mixer... APIs which you should be able to use to adjust system volume in XP — Mark Heath
Look at Mixer.Mixers and then for each mixer, look at its Destinations. Hopefully you can find the volume control you need to adjust — Mark Heath

sonne sonne · Accepted Answer · 2013-08-08T18:18:33

Here is the easiest and well known method using P/Invoke calls:

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Text;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;

    namespace VolumeControl
    {
       public partial class Form1 : Form
       {
          [DllImport("winmm.dll")]
          public static extern int waveOutGetVolume(IntPtr hwo, out uint dwVolume);

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

      public Form1()
      {
         InitializeComponent();
         // By the default set the volume to 0
         uint CurrVol = 0;
         // At this point, CurrVol gets assigned the volume
         waveOutGetVolume(IntPtr.Zero, out CurrVol);
         // Calculate the volume
         ushort CalcVol = (ushort)(CurrVol & 0x0000ffff);
         // Get the volume on a scale of 1 to 10 (to fit the trackbar)
         trackWave.Value = CalcVol / (ushort.MaxValue / 10);
      }

      private void trackWave_Scroll(object sender, EventArgs e)
      {
         // Calculate the volume that's being set
         int NewVolume = ((ushort.MaxValue / 10) * trackWave.Value);
         // Set the same volume for both the left and the right channels
         uint NewVolumeAllChannels = (((uint)NewVolume & 0x0000ffff) | ((uint)NewVolume << 16));
         // Set the volume
         waveOutSetVolume(IntPtr.Zero, NewVolumeAllChannels);
      }
   }
}

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

Also, if you wish to combine this to work with CoreAudioAPI - read this: Change master audio volume from XP to Windows 8 in C#

Change SYSTEM volume level in windows

1 Answers