I'm working on an C# WPF application that will be on a Windows 7 machine with an APC 1500 UPS attached. On power loss, I need the app to respond with certain shutdown activities before Windows 7 shuts it down.
Can I deal directly with windows events or do I need to interact with the APC software? If Windows, what events? Any links or info would be appreciated - I just haven't seen much when searching.
Thanks.
Perhaps this could help?
private ManagementEventWatcher managementEventWatcher;
private readonly Dictionary<string, string> powerValues = new Dictionary<string, string>
{
{"4", "Entering Suspend"},
{"7", "Resume from Suspend"},
{"10", "Power Status Change"},
{"11", "OEM Event"},
{"18", "Resume Automatic"}
};
public void InitPowerEvents()
{
var q = new WqlEventQuery();
var scope = new ManagementScope("root\\CIMV2");
q.EventClassName = "Win32_PowerManagementEvent";
managementEventWatcher = new ManagementEventWatcher(scope, q);
managementEventWatcher.EventArrived += PowerEventArrive;
managementEventWatcher.Start();
}
private void PowerEventArrive(object sender, EventArrivedEventArgs e)
{
foreach (PropertyData pd in e.NewEvent.Properties)
{
if (pd == null || pd.Value == null) continue;
var name = powerValues.ContainsKey(pd.Value.ToString())
? powerValues[pd.Value.ToString()]
: pd.Value.ToString();
Console.WriteLine("PowerEvent:"+name);
}
}
public void Stop()
{
managementEventWatcher.Stop();
}
You might try simply catching WM_QUERYENDSESSION. MSDN has some good example code for this.
It is my understanding that in Windows Vista/7, it is no longer possible to indefinitely delay a shutdown or suspend. However, I do believe the system will give your process a reasonable amount of time to do things before ending it. (Someone, please correct me if I am wrong on this point.)
Note that this only helps you upon shut down. If you need notification and management info on the UPS itself, then I am unsure on how to dot this.
