I am looking for a way to have an "alarm" type timer that throws an event at a specific system time. Is there a way to do this with UWP apps? I need my application to be able to enter "day mode" at a certain time in the day. Currently, I am using a System.Timers.Timer(), but if the computer goes into sleep mode in the middle of the timer running, it does not count sleep-mode time as part of the timed event. Is there a way to have an alarm type event that is based off of system time as opposed to "timed" time?
Is there a way to have an alarm type event that is based off of system time as opposed to "timed" time?
I have to say that the answer is no. There is no such way that could make an alarm still function in sleep mode. Even the system build-in Alarm app won't work in sleep mode.
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I want to disable a button for twenty minutes this should remain disabled even if the application is restarted.
I was thinking doing this by reading and storing the time when the button is pressed, then read the system time every minute and when the elapsed time be 20 or more minutes, enable the button.
I think this would allow me to restore the time when the button was pressed if the application is restarted; and then check for the elapsed time.
Do you think this is a good idea?
Any other option?
Since you want this setting to work even if the application restarts, this won't be possible unless you involve an external agent. A few options that you might try involve:
Read current Internet time from http://time.windows.com or nist etc and store it somewhere (registry or local file). Use a timer within your application that keeps fetching latest time from the Internet and compares it to the save value. This post allows you to read current Internet time using both HTTP and TCP port 13.
Use Windows scheduled tasks. Set a bool flag somewhere (file/registry again) and ask the scheduled task to clear the flag after 20 minutes. This post should get you going with creating scheduled tasks.
Create a Windows service that keeps running in the background that you could call to set the flag and the length of time for which this flag should remain set. The service should run an internal Timer (and should not rely on system time) to keep track of "ticks". After the specified time has elapsed, the service should clear he flag.
Here is what I am thinking,
When the application starts, disable or hide the button
Set the time stamp when disabling/hiding and store in a database table or a file.
Now read every minute or every five minutes - whichever is convenient to see if 20 minutes have elapsed.
IF 20 minutes have passed, remove the entry from table or file.
And if the application crashes or restarts before setting the time stamp:
1.While setting the time stamp, make sure that the table or file is empty. If not, enable the timer - the time stamp is there.
Well if I were you, I'd basically disable the button
and then start a timer, each minuite, the program should write the time left to a file as well as the current time ( you can also decrypt this file, so that users can't change it )
Now when the program restarts, it should read this file, and start a timer according to the written time in the fil :)
If you want the timer to work even when the program is closed, then you might check this out (File.GetLastAccessTime)
Basically, you should compare the (current time) that has been written to the fil, with the last access time, and make a function to get the time left :)
This might not be a perfect solution, but it will work fine ( I guess )
Kind Regards :)
i am working on an asp.net web application, where tasks are assigned to users, we set standard time to every task, in that standard time period the user has to finish the task, there are two buttons on the page, proceed and save, when a user clicks on proceed button, the time is saved in database as starttime, and when the user clicks on save button, the time is saved in database as endtime. this way we are capturing the time period within which the user is completing the task.
the standard time is set on an average time study basis, not every time the task takes the same amount of time.
often users can complete the task in very less time than the standard time, in this case the users are proceeding the task and even after completing the task, instead of saving it, they lock the system and go for tea breaks and after coming from break, they save the task.
i want to save some information on the web page when they lock the pc even when the browser is minimized.
i tried implementing applet using jintellitype library but its not capturing the key combinations that are used by windows os.
i also tried using Silverlight but there is no such support as in winforms application in Silverlight, i have to create a com component or something that interacts with system32 or some native api. it doesn't seem easy for me, i would like to know if there is such library for Silverlight.
it should be browser independent, i haven't tried ActiveX, but i think it can be done using ActiveX, but i don't want to use ActiveX as it runs only on IE.
i want to know all the possible solutions to achieve this.
thanks in advance.
Why don´t you set a kind of timer-check to know if the last time is too far from the correspondent (and previewed) time to perform the job? If a task may expend, for instance, from 1 to 5 minutes, have 21 minutes is too far.
Why din´t you create a timer to TIMEOUT user? If users know they will be timed-out after some time, probably, they won´t leave to coffre-break during the test (a kind of penalty must be aggregated on this, like start from the initial point if timeout).
Why don´t you automatically save the record after the job finish, instead obly the user to press a button?
Until I know, you can perform SUSPEND mode, but not detect them if started from other apps.
How can I detect if the Application has been idle for let's say 30 seconds?
I know this is possible by using a DispatcherTimer and then restarting it at PhoneApplicationPage.ManipulationCompleted event? But, I am concerned as this will affect the performance of the application.
Are there any better solutions?
You're on the right track. There isn't an explicit "idle" notification (especially not one that fast).
ManipulationCompleted may not always fire for you since other input can prevent the manipulation from starting and a user could do a very long manipulation. I'd reset the timer on any mouse input rather than just on ManipulationCompleted.
Depending on how exact you need your 30 second timer to be I would consider leaving the timer running and setting a flag for the last input. When the timer expires then check if the flag has been set. This way you won't need to continuously reset the timer for every user input.
I want to create something like a client in c#.
But I do not know that how I can learn computer status like sleep mode, off, logged in or logged out.
Also, I need to get the warning if the user haven't used the computer for 10 minutes.
You can find information about currently logged user and how to hook the Locked/Unlocked events in this thread.
There are some other different approaches you might try:
You can use the System.Diagnostics and get the process list via Processes.GetProcesses(). Just keep an eye on the Idle process -- if it runs for more than 50% CPU longer than 10 mins the user seems to be idling too.
You can use Performance Counters to monitor the activity taking place on the computer and make certain decisions.
You can also use the WMI service with similar purposes.
Partial answer:
User activity/inactivity can be monitored using hooks. Start a timer with a 10-minute interval. Whenever you detect a keyboard/mouse message, restart it. If the timer event happens, than you detected 10 minutes of inactivity.
I wanted to create something similar to the way anti-virus programs sit in the Tray and can re-do an event (e.g. a scan) on an interval. I have a program that exports data from our SQL server and the user sets up a queue of what they wanted exported.
I was thinking about using System.Windows.NotifyIcon
http://msdn.microsoft.com/en-us/library/system.windows.forms.notifyicon.aspx
and
System.Timer
http://msdn.microsoft.com/en-us/library/system.timers.timer%28v=vs.71%29.aspx
Let's say the user has it set to repeat every X hours or "Every Day" or "Every Wednesday at 5:00". Should I just create a tray icon and
this.Hide();
and setup a timer that ticks and compares the time when the timer was started against whatever criteria the user set? Or, is this an inefficient and memory wasting way to do it? Is there any way to "schedule" an event to fire at a certain time and handle it that way?
You can use Windows scheduled tasks.
There is a library called Task Scheduler Managed Wrapper that can be used to set up tasks from c#.