How do I cancel standby and hibernation?
my application running in c # using third party framework.it works as a user interface for many application.my questions when my application is running and the system should not be doing fallback / hybernate OS operations. somehow i have to cancel event for wait / hybernate raised by OS.please, somebody helped me in this regard.
Thanks Sun
This post explains how to prevent computer migration using SetThreadExecutionState . The code looks like this:
public partial class Window1 : Window
{
private uint m_previousExecutionState;
public Window1()
{
InitializeComponent();
// Set new state to prevent system sleep (note: still allows screen saver)
m_previousExecutionState = NativeMethods.SetThreadExecutionState(
NativeMethods.ES_CONTINUOUS | NativeMethods.ES_SYSTEM_REQUIRED);
if (0 == m_previousExecutionState)
{
MessageBox.Show("Call to SetThreadExecutionState failed unexpectedly.",
Title, MessageBoxButton.OK, MessageBoxImage.Error);
// No way to recover; fail gracefully
Close();
}
}
protected override void OnClosed(System.EventArgs e)
{
base.OnClosed(e);
// Restore previous state
if (0 == NativeMethods.SetThreadExecutionState(m_previousExecutionState))
{
// No way to recover; already exiting
}
}
}
internal static class NativeMethods
{
// Import SetThreadExecutionState Win32 API and necessary flags
[DllImport("kernel32.dll")]
public static extern uint SetThreadExecutionState(uint esFlags);
public const uint ES_CONTINUOUS = 0x80000000;
public const uint ES_SYSTEM_REQUIRED = 0x00000001;
}
If you like the app described in the post there is an updated version here .
source to share
Unable to cancel event from .NET. You will need to do this with P / Invoke and Win32 API by accessing WM_POWERBROADCAST
and returning BROADCAST_QUERY_DENY
. Check out this CodeGuru page for stepping in the right direction.
Also interesting is this page , which details some of the events that are triggered in .NET when a user logs out or suspends / hibernates.
source to share