timer

问题 I would like to schedule tasks in iOS to execute a method depending on the time of the day and the day. For example, I want to execute startMonitorRegion every day at 10pm and stopMonitorRegion at 10am. I don't want to send a local notification to alert the user, it needs to be transparent for the user. Is anyway to do it using NSTimer? The app will be in background. 回答1: You can utilize Local notifications for this purpose. Just schedule local notification for some date/time. and once user

问题 Is it possible to call async_wait several times on the same boost::asio::deadline_timer? What I mean to do is something like the following: t->expires_from_now(delay); t->async_wait(f1); t->async_wait(f2); Does this ensures that the two functions will be called? Does this ensures that the two functions will be called in this order? If not, any idea how to have f1 and f2 successively called when the timer times out? (I don't care if another handler is executed between the calls to f1 and f2).

问题 I'm having trouble to create timer under my embedded Linux running ARM. I'm using a home made C++ library to manage timer. I didn't code it myself, I don't know deeply the implementation despite I have access to the source code... It works for a while and then I got the error "EAGAIN". Using strace I noticed that when it doesn't work the timer ID is quiet high! timer_create(CLOCK_MONOTONIC, {0, SIGRT_3, SIGEV_SIGNAL, {...}}, 0xbed50af4) = -1 EAGAIN (Resource temporarily unavailable) See the

问题 What .NET object (or technique) is the most precise at launching a thread every XXX milliseconds? What are the tradeoffs? For example: int maxDurationMs = 1000; while (true) { DateTime dt = DateTime.UtcNow; DoQuickStuff() TimeSpan duration1 = DateTime.UtcNow - dt; int sleepTime = maxDurationMs - duration1.Milliseconds; if (sleepTime > 0) System.Threading.Thread.Sleep(sleepTime); } or // CPU Intensive, but fairly accurate int maxDurationMs = 1000; while (true) { DateTime dt = DateTime.UtcNow;

问题 I am relatively new to java and was curious about how ActionListeners work. Say I have an action listener for a timer implemented as follows: class TimerActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { //perform some operation } } What will happen if the timer is set to run faster than the code in my actionlistener class can execute. Does the code finish executing and ignore new requests until it is done (like an interrupt). Or does the new call to

问题 i need to do update images in my site without doing post back in a page.So, i loaded the images in ad-rotator to toggl between images. I also used the timer tick function to refresh the images in the ad-rotator. But while timer tick function refresh the whole page is refreshed so that all functions that i declared in the page is reloaded. i need to only images in the ad-rotator images should refresh not the whole page. i need to avoid whole refresh of the page. Pls help me. $(document).ready

问题 I wanted a timer with the following properties: No matter how many times start is called, only one call back thread is ever running The time spent in the call back function was ignored with regards to the interval. E.g if the interval is 100ms and the call back takes 4000ms to execute, the callback is called at 100ms, 4100ms etc. I couldn't see anything available so wrote the following code. Is there a better way to do this? /** * Will ensure that only one thread is ever in the callback */

问题 I created a BlinkingLabel class, derives from Forms.Label , which has a Forms.Timer which allows me to enable and disable the blinking effect. I have created 4 labels of BlinkingLabel type, my problem is that if all 4 labels where to blink in different times, the blinking effect is not synced. How can I adjust my design in a way that even if the labels where blinking in different times, the blinking will be synced? ******* Edited****** I added the following code, but still I can't get label 1

问题 FaceView.java package com.example.richelle.neeuro; public class FaceView extends View { private float radius; NormalFace normalFace; HappyFace happyFace; public FaceView(Context context, AttributeSet attrs) { super(context, attrs); // get radius value TypedArray a = context.getTheme().obtainStyledAttributes( attrs, R.styleable.FaceView, 0, 0 ); try { radius = a.getDimension(R.styleable.FaceView_radius, 20.0f); } finally { a.recycle(); } // initiate HappyFace class normalFace = new NormalFace

问题 I need to create Timer in my VC++ application , at where i need to set timer and on timeout of timer , i need to call one specific method... i have seen msdn forums for that and done below code to do that SetTimer(NULL,1,5*1000,TimerProc); and my TimerProc method is as below void CALLBACK TimerProc(HWND aHwnd, UINT aMessage, UINT_PTR aTimerId, DWORD aTime) { StopProceess(); } i assume after 5 seconds the SetTimer should call TimerProc method , but it is never called. no idea what i am doing