Issue:
I have a WPF fullscreen application, which acts as a dashboard. The computer is in domain and domain policies enforce the computer to be locked in 10 minutes after the last user activity. I want to prevent the workstation (or desktop) from locking automatically.
An example of such behavior: Windows Media Player, which prevents this while a movie is running.
Known solutions (kinda workarounds):
QUESTION:
How can I prevent windows workstation from locking without using these workarounds?
Disclaimer:
I was pretty sure, there should be a similar question answered somewhere on StackOverflow, but i didn't find any. I would appreciate, if you could point me into the right direction.
The solution has been pointed out through the comments, but I'm providing a simple starter solution for anyone else arriving via a web search:
/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern EXECUTION_STATE SetThreadExecutionState(EXECUTION_STATE esFlags);
public App()
{
InitializeComponent();
App.Current.Startup += new StartupEventHandler((sender, e) =>
{
SetThreadExecutionState(EXECUTION_STATE.ES_DISPLAY_REQUIRED | EXECUTION_STATE.ES_CONTINUOUS);
});
App.Current.Exit += new ExitEventHandler((sender, e) =>
{
SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS);
});
}
}
[FlagsAttribute]
public enum EXECUTION_STATE : uint
{
ES_AWAYMODE_REQUIRED = 0x00000040,
ES_CONTINUOUS = 0x80000000,
ES_DISPLAY_REQUIRED = 0x00000002,
ES_SYSTEM_REQUIRED = 0x00000001
// Legacy flag, should not be used.
// ES_USER_PRESENT = 0x00000004
}
An alternative place to put the logic would be within an event handler for StateChanged
on your main application window:
this.StateChanged += new EventHandler((sender, e) =>
{
if (WindowState == System.Windows.WindowState.Maximized)
{
SetThreadExecutionState(EXECUTION_STATE.ES_DISPLAY_REQUIRED | EXECUTION_STATE.ES_CONTINUOUS);
}
else
{
SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS);
}
});
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