Solved

on line contest

Posted on 2011-02-23
9
406 Views
Last Modified: 2013-12-26
Hi experts

 My problem is as follows

 I want to do an online contest and I want those who are online  watch, I have the code for random numbers but i can not present the same numbers in all online clients. each client  getting different random numbers.

Is there any way to do this ?

Same time in all online clients a pop up window running my random number script but having the same result in all ?

 Thank you
0
Comment
Question by:farmakis
  • 2
  • 2
  • 2
  • +2
9 Comments
 
LVL 26

Accepted Solution

by:
wilcoxon earned 250 total points
Comment Utility
Sure.  The obvious "naive" approach is to salt the random number generator with a unique based value.  Something like srand(int_mac_address+time()) - I'm pretty sure you want to do more manipulation of the srand value to prevent predictability.
0
 
LVL 13

Assisted Solution

by:Carl Bohman
Carl Bohman earned 250 total points
Comment Utility
It's not clear from the question whether the random number generator script is in the pop up window or on the server.  The only way to guarantee that each person sees a different random number is to have the random numbers generated on and come from the server (and have the server keep track of what numbers have already been generated so that duplicates are not possible).  If each client comes up with its own random number, the change of getting duplicates will always exist.

Assuming the server is generating the numbers in a way that avoids duplicates, you just need to send a different number to each client.
0
 

Author Comment

by:farmakis
Comment Utility
Thank you both for your answers

Maybe I was not quite clear

I be;ieve that the script must run on server side because i want to generate a 8 digit random number once,
My problem is that i want all online clients can see the generation of the number same time in a pop up window. All clients must see the generation process at their screens and the number must be the same for all. The one that the server generates.

You can take it like an online lottery that only one can win ( the number that server generates ) buy onli must see the generation process when this is happend.

I don;t know if i can give you a link so you can see exactly what the script do so ypu can help me.

Thanks again

Ilias
0
 
LVL 13

Expert Comment

by:Carl Bohman
Comment Utility
This is more of a web programming question, then.  It looks like you need to notify the clients when the number becomes available.  Most likely you are talking AJAX.
0
IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

 
LVL 26

Expert Comment

by:wilcoxon
Comment Utility
It could certainly be done with AJAX (not really my area of expertise).

It should also be possible to be done in more of a client-server style.  The server generates the random number seed and then the web page that each person looks at simply retrieves the seed and re-generates the list of random numbers (given the same seed and same PRNG, the list of random numbers will stay the same).  The upside to this method is that you can skip AJAX - the downside is that the viewer won't necessarily know as soon as the random numbers are available.

In any case, as bounsy says, this is a web programming question.
0
 

Author Comment

by:farmakis
Comment Utility
OK Thanks again both for your aswers.

I;ll ask there

Anyway If you think you give mr your opinions the page is here

http://www.travelbookstore.gr/index/Win4Popup.htm

Many Thanks again

Ilias
0
 
LVL 10

Expert Comment

by:ReneGe
Comment Utility
@farmakis

Like "bounsy" was suggesting, you may want to change the zones of your question.

You could ask advise from the moderators:
http://www.experts-exchange.com/Programming/Languages/Scripting/Shell/Batch/requestAttention.jsp?attention&refType=10&refID=26843181
0
 
LVL 9

Expert Comment

by:Suhas .
Comment Utility
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
0

Featured Post

Free Trending Threat Insights Every Day

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

I have published numerous articles here at Experts Exchange that present programs/scripts written in a language called AutoHotkey. Each of those articles has a brief paragraph describing where to download the product and how to install it. I have al…
Introduction: Recently, I got a requirement to zip all files individually with batch file script in Windows OS. I don't know much about scripting, but I searched Google and found a lot of examples and websites to complete my task. Finally, I was ab…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…

763 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now