Change sound volume using ctrl/

[NFedorenko]

Hello to all!

There is an intereting task to change system sound volume through WinCC OA.
Is there any way to do that?

Or maybe any advices? B)

[leoknipp]

When using Linux you can probably do it with the command "pactl" or "alsamixer".
For Windows you have to install some 3rd party software or implement your own tool.

Best Regards
Leopold Knipp
Senior Support Specialist

[ozangor]

There is this small cmdline application nircmd.
You can call the commands by using "system()" function of wccoa.

Code: Select all

btnClicked(string name, const mapping& event)
{
  string command = "nircmd ";
  switch(name)
  {
    case "btnVolumeUp":
    {
      command += "changesysvolume 5000";
      break;
    }
    case "btnVolumeDown":
    {
      command += "changesysvolume -5000";
      break;
    }
    case "btnMute":
    {
      command += "mutesysvolume 1";
      break;
    }
    case "btnUnmute":
    {
      command += "mutesysvolume 0";
      break;
    }
  }
  system(command);
}

This has a lot of utility functions to play with. However, make sure the license is ok for your usage.

This is applicable only for Windows though.