timer

问题 I have a windows service where in I want to create a file every 10 seconds. I got many reviews that Timer in Windows service would be the best option. How can I achieve this? 回答1: Firstly, pick the right kind of timer. You want either System.Timers.Timer or System.Threading.Timer - don't use one associated with a UI framework (e.g. System.Windows.Forms.Timer or DispatcherTimer ). Timers are generally simple set the tick interval Add a handler to the Elapsed event (or pass it a callback on

问题 What is the best way to exit out of a loop as close to 30ms as possible in C++. Polling boost:microsec_clock ? Polling QTime ? Something else? Something like: A = now; for (blah; blah; blah) { Blah(); if (now - A > 30000) break; } It should work on Linux, OS X, and Windows. The calculations in the loop are for updating a simulation. Every 30ms, I'd like to update the viewport. 回答1: The code snippet example in this link pretty much does what you want: http://www.cplusplus.com/reference

问题 As a follow up to my previous How can I create a reference cycle using dispatchQueues?: For the strong references (that create leaks, but aren't reference cycles) e.g. Timer , DispatchSourceTimer , DispatchWorkItem , the memory graph doesn't create a purple icon, I suspect it's simply because it doesn't find two objects pointing back to each other strongly. I know I can go back and forth and observe that a specific class is just not leaving the memory, but wondering if Xcode is providing

问题 I'm currently making a math game where the user has 60 seconds to answer as many questions as possible. As of now, I have everything working except for the timer which should either count down to 0 or count up to 60 then stop the game. Right now, I have the timer set to time.clock() to count up to 60 and while the timer is less than that, the game will continue to run. For some reason however, the time.clock() isn't working as I expect it to. I also tried running two while loops at the same

问题 I'm working on an UWP MVVM project and would like to implement an automatic logout system if the user interaction stops for a specific time. Until now I'm using a DispatcherTimer to count backwards from 200 every second. TimerLeave = 200; var _dispatcherTimer = new DispatcherTimer(); _dispatcherTimer.Tick += dispatcherTimer_Tick; _dispatcherTimer.Interval = new TimeSpan(0, 0, 1); _dispatcherTimer.Start(); But because the DispatcherTimer is linked with the UI and I'm building a MVVM App, I'm

问题 I want to make a Windows Form Application which only shows a timer as: xx days xx hours xx minutes xx seconds No option for setting the timer or anything, i want to do that in the code However, the problem is i want it to count down from current time (DateTime.Now) to a specific date. So i end up with the time left as TimeSpan type. I'm now in doubt how to actually display this, so it's actually working, and updating (counting down) Can't seem to find a tutorial that helps me, so i hope i may

问题 ActionListener taskPerformer = new ActionListener() { public void actionPerformed(ActionEvent evt) { //...Perform a task... logger.finest("Reading SMTP Info."); } }; Timer timer = new Timer(100 ,taskPerformer); timer.setRepeats(false); timer.start(); According to the documentation this timer should fire once but it never fires. I need it to fire once. 回答1: This simple program works for me: import java.awt.event.*; import javax.swing.*; public class Test { public static void main(String []

问题 I am trying to understand why a Windows.Forms.Timer is not disposed when the form that created it is. I have this simple form: public partial class Form1 : Form { private System.Windows.Forms.Timer timer; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { timer = new Timer(); timer.Interval = 1000; timer.Tick += new EventHandler(OnTimer); timer.Enabled = true; } private void OnTimer(Object source, EventArgs e) { Debug.WriteLine("OnTimer entered");

问题 I want to create a service, that runs a method after 10 seconds over and over again, until I stop it, even if the app is closed. My attempted code is below package com.example.tauben; import java.util.Timer; import java.util.TimerTask; import android.app.Service; import android.content.Intent; import android.os.IBinder; import android.widget.Toast; public class Reminder extends Service { @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onCreate() { TimerTask

问题 I'm writing an app that will need to make use of Timer s, but potentially very many of them. How scalable is the System.Threading.Timer class? The documentation merely say it's "lightweight", but doesn't explain further. Do these timers get sucked into a single thread (or very small threadpool) that processes all the callbacks on behalf of a Timer , or does each Timer have its own thread? I guess another way to rephrase the question is: How is System.Threading.Timer implemented? 回答1: I say