real-time

问题 I am making an app calling methods after one second. [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(loadNews) userInfo:nil repeats:NO]; how to call thi 回答1: Your question is incomplete. However using the title, I can say that you cannot set the NSTimer to anything like nano-seconds and expect the request be honored in the way you hope. The smallest interval that it appears it can be set to is 0.1 milliseconds (or 0.0001 seconds). The the api documentation states:

问题 I'm trying to write a script that display row value in a SpreadSheet file using UiApp. And this script will need to update the data whenever there is a change to the SpreadSheet. This would normally be simple with just Trigger onChange. However, the SpreadSheet itself is also updated by another function, and it seem that onChange is not triggered when the changes made are caused by another AppScript. Is there an alternative way to achieve what I described? Code below, thanks var ss =

问题 I don't know if this is a simple question or impossible or anything, but I couldn't find anything on it so I figured I would ask it. Is it possible to return values from a while loop while that loop is still running? Basically what I want to do is have a vector constantly updating within a while loop, but able to return values when asked without stopping the while loop. Is this possible? Do I just have to break up the program and put the while loop in a separate thread, or can I do it within

问题 I need to run real time applications on Ubuntu RT Linux and was reading about ways to make linux act as RT system and I learned two ways to do it preemptive_rt kernel patching enabling CONFIG_RT_GROUP_SCHED flag in the kernel. I've already tried my hands on 1st method Install RT Linux patch for Ubuntu However, apart from uname -r showing #1 SMP PREEMPT RT I've no other proof that it is actually a RT system and hence want to try the 2nd method. Enable CONFIG_RT_GROUP_SCHED flag in the kernel

问题 My goal is to visualize the incoming data stream on a browser. I have used activemq to queue the stream. A single message consumed from the queue looks like this: "int,date/time,int,string". I have to update my line graph on the browser (every 100ms). Any ideas? 回答1: It sounds like a use case for WebSocket. There are many ways to implement it, but a rather nice blog post on the topic is presented here. Another way is to use MQTT directly from the browser using javascript and subscribe to a

问题 I would like to implement a realtime dashboard like an index page of www.foursquare.com I checked foursquare.com's index page with Chrome's developer tool and surprised that they don't use xhr to get those information approx. every 5 seconds. Using ajax polling causes memory leak in some browsers and make a server busier. Is there any way that I can implement a realtime dashboard efficiently with PHP and jQuery(AJAX)? (Perhaps I need an extra server something like a push server?) :| 回答1:

问题 I have a data stream giving me 125 floats per second and I want to plot them live. At the moment my code looks like this: Code to read data from stream counter = 0 while True: counter = counter+1 data from stream (x values) In reality the code looks a bit more complicated, of course, but this will make giving advice easier, I think. I was thinking about just saving the graph as a file: counter=0 a_data=np.zeros(100,float) #this is limited to 100 floats while True: counter = counter+1

问题 I'm working on an app where I'd like to be able to do things with a user's Facebook username. I know that I can get this through the basic user object, but I'm worried about the case where the user doesn't have a FB username when they register with my site/application, but does gets one later. The question is how to test this with FB test users: A user (a regular user, anyway) has to be verified before they can get a username. Is it possible to verify test users? If so, is it then possible to

问题 I've written a real-time application for Android that receives hundreds of input events per second and spits out a few output events per second. The input events drive state machines to produce the output events. I write both the input and output events to a file for each run. I want to use the files of runs that I deem valid for regression testing. I'll feed the recorded input events to the system and look for the expected output events. My system receives events via a looper/handler and

问题 Hello I am trying to build an application using flask and the twitter stream API. What I would eventually like to do is update a map in real time with tweets based on their attached geolocation data. What would be the best option for me to send real time data to the user without a page refresh? Is Ajax an option? I also looked into Juggernaut which now seems to be depreciated. Any help steering me in the right direction would be greatly appreciated. 回答1: There are a couple things you can do.