real-time

问题 I'm trying to build a system where user can subscribe to a category on establishing connection to websocket server and then he will start receiving updates for that category. So far, I have worked with Ratchet and I am able to send message to all the connected clients but the problem is I don't want to send message to all the clients I just want to send the message to the clients who have subscribed the the particular category in which the messages was sent. PHP Code Chat.php <?php namespace

问题 // gridlines are not moving along as the line point changes. what code should I add to make it look like the cpu performance chart? Series test1 = new Series(); Series test2 = new Series(); private void Form1_Load(object sender, EventArgs e) { test1.Color = Color.Blue; test1.ChartType = SeriesChartType.FastLine; test1.BorderWidth = 2; test2.Color = Color.Red; test2.ChartType = SeriesChartType.FastLine; test2.BorderWidth = 2; chart1.Series.Add(test1); chart1.Series.Add(test2); chart1

问题 I'd like a response from someone who actually does real-time programming in C# or who really understands the language internals. I know that exceptions should not be used to handle normal processing, but only to detect error conditions. There is plenty of discussion on that topic. I'd like to know if there is any run time slow-down from simply having a try/catch block in place (which never catches an exception unless the program will have to end anyway). The try/catch block is inside a

问题 I am having a major setback on this question on a while now... import numpy as np import matplotlib.pyplot as plt plt.ion() fig = plt.figure(1) ax = fig.add_subplot(111) ax.set_title("linear realtime") line, = ax.plot([],[]) i = 0 while ( i < 1000 ): #EDIT: # this is just sample data, but I would eventually like to set data # where it can be floating numbers... line.set_data(i,i) fig.canvas.draw() i += 1 I am trying to draw a linear line in real time but I am unable to come up with the result

问题 I try to call a function every 1 ms. The problem is, I like to do this with windows. So I tried the multimediatimer API. Multimediatimer API Source idTimer = timeSetEvent( 1, 0, TimerProc, 0, TIME_PERIODIC|TIME_CALLBACK_FUNCTION ); My result was that most of the time the 1 ms was ok, but sometimes I get the double period. See the little bump at around 1.95ms multimediatimerHistogram http://www.freeimagehosting.net/uploads/8b78f2fa6d.png My first thought was that maybe my method was running

问题 I found this awesome program(html editor) called Brackets and it's by Adobe. Now reason why i got the editor was because i wanted to Live Preview PHP code, but i found out later that i needed a Wamp Server. Now, i was in the mood of making an about page but i couldn't live preview. Live Preview Base URL is empty, and when i try to live preview, i get this: > http://puu.sh/aDkET/4209ec1192.png < and the lightning bolt is half orange(i heard it needs to be red to work). I have tried the lot...

问题 I use laravel 5.3 I created an online store website. If user logs in and chooses a product then okay button, there will be realtime notification in icon cart. My code looks like this : If user selects product and okay button, it will run this function : public function addNotificationCart() { Notification::send(auth()->user(), new CartNotification($cart)); } Then : public function toBroadcast($notifiable) { return new BroadcastMessage([ 'id' => $this->data->id, 'time' => $this->data->created

问题 This question already has answers here : Run certain code every n seconds [duplicate] (7 answers) Closed 5 years ago . I have a threaded class whose loop needs to execute 4 times every second. I know that I can do something like do_stuff() time.sleep(0.25) but the problem is that is doesn't account for the time it takes to do_stuff() . Effectively this needs to be a real-time thread. Is there a way to accomplish this? Ideally the thread would still be put to sleep when not executing code. 回答1

问题 I'm very new to MATLAB and I was trying to display a real time plot of some calculations. I have an N sized vector and I work with m values at a time (say m = N/4 ), so I want to plot the first m values and then as soon as the second m values are calculated have them replace the first plot. My approach was as follows: for i=1:N, ... //compute m ... plot(m); end; but it fails to update the plot in every loop and waits for all the loops to finish to plot the data. My question is: Should I use

问题 I implemented an app that does real time broadcasting of music from one iphone to another based on Ray Wenderlich's tutorial about GKSession and Matt Ghallagher's tutorial on audio streaming. Everything worked perfectly.. until we've decided to replace the poker game UI with that of our own. The result is that suddenly the networking throughput drops dramatically. Below is a profiler snap shot of the server Here is a snapshot of the client of the original app and here is a snapshot of the