C# get master volume level/precent

Question

I got this code to mute/unmute the master volume

private const int APPCOMMAND_VOLUME_MUTE = 0x80000;
private const int WM_APPCOMMAND = 0x319;

[DllImport("user32.dll")]
public static extern IntPtr SendMessageW(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr)APPCOMMAND_VOLUME_MUTE);

I would to know how can I get the master volume level/precent because I want to know if the sound is already muted or not.

Edit: or else I would like to split the mute/unmute sound so I will have two functions - one for mute and one for unmute.

thanks

Answer 1

Have a look at this project http://www.codeproject.com/KB/vista/CoreAudio.aspx

They created an own mixer control, that also reports the current volumne and the mute/unmute state:

defaultDevice.AudioEndpointVolume.OnVolumeNotification += new AudioEndpointVolumeNotificationDelegate(
    AudioEndpointVolume_OnVolumeNotification);
// .. snip ..
void AudioEndpointVolume_OnVolumeNotification(AudioVolumeNotificationData data)
{
    Console.WriteLine("New Volume {0}", data.MasterVolume);
    Console.WriteLine("Muted      {0}", data.Muted);
}

Does this help you?

EDIT: With this code and the class from the project you should be able to set and unset mute directly (without toggle):

MMDeviceEnumerator devEnum = new MMDeviceEnumerator();
MMDevice defaultDevice = devEnum.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia);
defaultDevice.AudioEndpointVolume.Mute = true; // or false

Answer 2

I could not do it for all Windows versions (xp, vista & 7).
Though, I achieved it by used external programs, such as NirCmd, and sent the command I needed.

not so good solution but it did solve my problem.

Answer 3

This thread shows how to control the master volume from C#.

You might also be interested in the responses to this question: Get Master Sound Volume in c#

Especially the NAudio managed wrapper.