timer | 易学教程

Fast and Precise Python Repeating Timer

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问题 I need to send repeating messages from a list quickly and precisely. One list needs to send the messages every 100ms, with a +/- 10ms window. I tried using the code below, but the problem is that the timer waits the 100ms, and then all the computation needs to be done, making the timer fall out of the acceptable window. Simply decreasing the wait is a messy, and unreliable hack. The there is a Lock around the message loop in the event the list gets edited during the loop. Thoughts on how to

Call method on the GUI thread from a timers thread

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问题 In my application I am using a timer to check for updates in an RSS feed, if new items are found I pop up a custom dialog to inform the user. When I run the check manually everything works great, but when the automatic check runs in the timers Elapsed event the custom dialog is not displayed. First of all is this a thread issue? (I am assuming it is because both the manual and automatic check use the same code). When I run the automatic check, do I have to invoke the method that runs the

Timer to close the application

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问题 How to make a timer which forces the application to close at a specified time in C#? I have something like this: void myTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) { if (++counter == 120) this.Close(); } But in this case, the application will be closed in 120 sec after the timer has ran. And I need a timer, which will close the application for example at 23:00:00. Any suggestions? 回答1: The first problem you have to fix is that a System.Timers.Timer won't work. It runs the

Timer: how to remain timer active in Background

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问题 In my iPhone Timer Application, In which a timer should run in background. So, I have set the notification in appdelegate it works perfectly... With that I am calling the methods from view controller which makes timer alive. Take a look some code... App delegate - (void)applicationDidEnterBackground:(UIApplication *)application { /* Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its

CUDA: Difference between CPU timer and CUDA timer event?

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问题 What is the difference between using a CPU timer and the CUDA timer event to measure the time taken for the execution of some CUDA code? Which of these should a CUDA programmer use and why? CPU timer usage would involve calling cudaThreadSynchronize before any time is noted. For noting the time clock() could be used or high-resolution performance counter like QueryPerformanceCounter (on Windows) could be queried. CUDA timer event would involve recording before and after by using

Calculating number of seconds between two points in time, in Cocoa, even when system clock has changed mid-way

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问题 I'm writing a Cocoa OS X (Leopard 10.5+) end-user program that's using timestamps to calculate statistics for how long something is being displayed on the screen. Time is calculated periodically while the program runs using a repeating NSTimer. [NSDate date] is used to capture timestamps, Start and Finish . Calculating the difference between the two dates in seconds is trivial. A problem occurs if an end-user or ntp changes the system clock. [NSDate date] relies on the system clock, so if it

Calculating number of seconds between two points in time, in Cocoa, even when system clock has changed mid-way

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Android - Cant Remove Wifi Network Programatically- The method removeNetwork(int) in the type WifiManager is not applicable for the arguments (String)

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问题 I'm attempting to remove my wifi network programatically - however I cannot seem to get it to remove/forget the currently connected wifi connection. This should be a pretty simple task - so I'm not sure exactly what I'm doing wrong. I'm using the following StackOverflow post as an example: How to forget a wireless network in android programmatically? public class KillTimer extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

Running a Java method at a set time each day

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问题 I'm relatively new to Java and I've pick up a project to work on. However, I've run into a block. I need a method to run at a certain times throughout the day. I've done quite a bit of searching but I can't find anything that seems like it would do the trick. I've run into the Timer class but it appears to run at certain intervals. The Scheduler class, appeared to have the same issue. I also came across Quartz but I think I need something more lightweight and I could only see how to do things

小议时序调度Timer和Quartz

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 本文不是用来讲授入门手把手ABC小例子的，算是自己这段时间对Timer和Quartz使用心得的总结吧，后续如果有更深的认识会不断更新的。言归正传，想实现定时调度，最简单的方法是使用 Timer 还是先给个使用范例： Java代码 long PERIOD = 60 * 1000 ; //一分钟 Timer timer = new Timer( "sure's timer" ); timer.schedule( new TimerTask() { @Override public void run() { if (!doSomething()){ timer.cancel(); } } }, 0 , PERIOD); 上面的代码实现了一个从当前时间开始执行的，以一分钟为周期的定时器。执行的内容在doSomething()方法中实现，这个方法返回是否继续执行的布尔值，因此可以在需要的时候将定时器cancel掉。好了，让我们看一看Timer的源码。（注：这个本人学习习惯有关，看了一个简单的例子就不想再看大段大段的文字了，还是看看源码比较直接，也比较准确） Java代码 public class Timer { private TaskQueue queue = new TaskQueue(); private