Windows Volume adjustment

[AdamBGames]

So Im planning to build my own desk and part of it will include multiple buttons where I will sit to turn on my pc, one to restart it and the other 3 to adjust volume and mute the pc. I know to do the first 2 but my question is does anyone know the serial code for changing volume up, down and muting.

[wasab]

I believe you can do this using some APIs from Microsoft.

 

[AdamBGames]

Just now, wasab said:

I believe you can do this using some APIs from Microsoft.

 

do you have a link to the apI?

[Thunderzzu]

9 minutes ago, AdamBGames said:

do you have a link to the apI?

You could also use autohotkey but you'd need to make the buttons on the table send actual keystrokes or commands to the PC in order for autohotkey to recognise them. You could do this easily with any macro board, no matter how cheap it is, as long as it offers a way to send keystrokes. Even an external numpad can do this

[Pinguinsan]

In WinForms, the KeyEventArgs.KeyValue (raw value) for the keys (at least on my machine) are:

VolumeMute: 0xAD (173)
VolumeDown: 0xAE (174)
VolumeUp  : 0xAF (175)

You can confirm this on your machine if you have Visual Studio, just compile a simple C# WinForms application, put a button onto it (it will default to being named button1, then attach the KeyDown event to this block of code:

private void button1_KeyDown(Object sender, KeyEventArgs e) {
    System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
    messageBoxCS.AppendFormat("{0} = {1}", "Alt", e.Alt);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "Control", e.Control);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "Handled", e.Handled);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "KeyCode", e.KeyCode);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "KeyValue", e.KeyValue);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "KeyData", e.KeyData);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "Modifiers", e.Modifiers);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "Shift", e.Shift);
    messageBoxCS.AppendLine();
    messageBoxCS.AppendFormat("{0} = {1}", "SuppressKeyPress", e.SuppressKeyPress);
    messageBoxCS.AppendLine();
    MessageBox.Show(messageBoxCS.ToString(), "KeyDown Event");
}

Then run the application, place the mouse cursor over the button, and hit whatever button combination you want to know the code of.

[Cdpopham]

Just posting for future searchers, as this is a couple days old.

 

Ther is a nice API for audio streaming and rendering for the .NET stack called:

 AudioSwitcher.AudioApi.CoreAudio

If you are using Visual Studio, right click on the dependencies/reference menu item and select "Manage NuGet Packages" and search for the above snippet then install. Add the namespace to the top of your class file with (in C#, use 'imports' instead of 'using' for VB.net):

 

using AudioSwitcher.AudioApi.CoreAudio;

Then in the method where you want to control the audio, you can use it like this to adjust the volume.

CoreAudioDevice defaultPlaybackDevice = new CoreAudioController().DefaultPlaybackDevice;
defaultPlaybackDevice.Volume = 80;

The MSDN documentation for the whole, very useful, API is here : https://msdn.microsoft.com/en-us/library/windows/desktop/dd370802(v=vs.85).aspx