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• GPG and libpcap help

  - by Johnq

  I was trying to install the newest version of libpcap (as the version in the repositories doesn't seem current) and ran into the following problem. I copied the tcpdump-workers.asc text from the tcpdump website (which hosts libpcap as well) and imported the key to my keyring using gpg --import tcpdump-workers.asc. That when all well and fine but when I tried to verify the libpcap-1.4.0.tar.gz file against the key with gpg --verify, I ended up getting the message that unexpected data. was found. I am wondering if anyone else has run into this problem as the ancient technique of googling my problem has done little to answer my question.

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• Thread count in Java game

  - by Taylor Hill

  I'm just curious as to what a reasonable number of threads is for a simple 2D mmo in Java. Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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• Application versioning

  - by Mathew

  Haven't find similar issue so sorry if thats a duplicate. I'm about to start a migration of an already existing project from one web container version to the another. Currently, the application version is 2.2.5. Business requirement is to deliver a 3.0 version by the end of the year. Additional constraint is to release a working, stable version by the end of Q3. We are about to work in 2-weeks sprints and I'm wondering how can I approach the problem? I was thinking about releasing 2.3 by the end of Q2, then immediately promoting it as 3.0-a1, work on alphas (3.0-a2, 3.0-a3, ...) till the end of Q3, to start with 3.0-b1 in the early Q4 and finally release 3.0 around December. I don't feel comfortable saying that the application is already in 3.0 state in July, but I can't see other options. If you find some book chapters/blogs or your personal experience interesting please share your opinion.

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• Without using a pre-built physics engine, how can I implement 3-D collision detection from scratch?

  - by Andy Harglesis

  I want to tackle some basic 3-D collision detection and was wondering how engines handle this and give you a pretty interface and make it so easy ... I want to do it all myself, however. 2-D collision detection is extremely simple and can be done multiple ways that even beginner programmers could think up: 1.When the pixels touch; 2.when a rectangle range is exceeded; 3.when a pixel object is detected near another one in a pixel-based rendering engine. But 3-D is different with one dimension, but complex in many more so ... what are the general, basic understanding/examples on how 3-D collision detection can be implemented? Think two shaded, OpenGL cubes that are moved next to each other with a simple OpenGL rendering context and keyboard events.

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• I'm seeing a lot of a new format for title elements for major sites: a few tags, and only then the title of the site itself, is this now optimal SEO?

  - by Tchalvak

  I'm seeing a lot of sites go to a format similar to the one now in use by stackexchange sites (i.e. short topic - maybe a long topic - only finally the site's name). Is this optimal SEO? It seems kind weird both because I'm only begun to notice changes in this direction recently, and because it seems like it would make it harder to tell in search results which actual site you're visiting, even if the topic is one that matches. Still, sites like Facebook, StackOverflow, etc probably aren't wrong, so I'm wondering if I should try to make my sites use that format, going forwards...

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• Do unused vertices in a 3D object affect performance?

  - by Gajet

  For my game I need to generate a mesh dynamically. Now I'm wondering does it have a noticeable affect in FPS if I allocate more vertices than what I'm actually using or not? and does it matter if I'm using DirectX or OpenGL? Edit Final output will be a w*h cell grid, but for technical issues it's much easier for me to allocate (w+1)*(h+1) vertices. Sure I'll only use w*h vertices in indexing, and I know there is some memory wasting there, but I want to know if it also affect FPS or not? (Note that mesh is only generated once in each time you play the game)

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• Can I use metro style interface in my own web application?

  - by LukeP

  I am wondering if I would need to license the Metro style or if I can just freely use it in my own applications. I mean, is it patented or protected in any way that would prevent me from building my own implementation? I effectively would like to copy the visible part of it. I like to idea of being able to: Provide an interface which is used somewhere else (as in 1 less to learn) Use the interface that has been tested for usability (I personally like it) Have the possibility of getting free publicity because of implementing full Metro style web application while not associated with Microsoft, etc.

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• Best practice, or generally best way to set up web-hosting server, permissions, etc. [closed]

  - by Jagot

  Hi, I'm about to set up a server upon which a friend and I will be hosting web sites, and I'll be using Debian. I've set up a LAMP solution many times just to using for local testing purposes, but never for actual production use. I was wondering what are the best practices are in terms of setting the server up, in reference specifically to accessing the web root directory. A couple of the options I have seen: Set up a single user account on the server for us both to use and use a virtual host to point to the somewhere in the home directory, e.g. /home/webdev/www. Set each of us up a user account, and grant permissions in some way to /var/www (What would be the best way? Set up a new group?) I want to get this right when I first set this up as there won't be any going back for a while once our first site is up and running. Appreciate any guidance in advance.

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• Do I lose/gain performance for discarding pixels even if I don't use depth testing?

  - by Gajoo

  When I first searched for discard instruction, I've found experts saying using discard will result in performance drain. They said discarding pixels will break GPU's ability to use zBuffer properly because GPU have to first run Fragment shader for both objects to check if the one nearer to camera is discarded or not. For a 2D game I'm currently working on, I've disabled both depth-test and depth-write. I'm drawing all objects sorted by their depth and that's all, no need for GPU to do fancy things. now I'm wondering is it still bad if I discard pixels in my fragment shader?

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• SEO - Hidden content before main site content

  - by 0pt1m1z3

  I have a two hidden divs before my main site content, one with the login form and another with the signup form. I then have login and signup buttons within the page that use JQuery to show or hide these divs. I like the effect this setup offers, dropping down from the top of the page and pushing the rest of the content down. However, recently I have been getting serious about SEO and I am wondering if these divs have been affecting my SERP rankings. Basically, every non-logged page (everything bots see) has the same two display:none; divs at the top of the document flow. Is it bad? Should I re-engineer these forms and the way they are displayed?

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• How to manage enemy movement and shoot in a shmup?

  - by whatever

  I'm wondering what is the best (or at least a good) way of managing enemies in a shoot-em-up. Basically, what I'd do would be a class that manages displaying and updating positions of all the enemies. But how to create good deplacements for enemies? A list of where-to-go points? gravitating around some fixed points (with ponderation, distance evaluation etc.)? Same question for the shoot patterns? Can you please put me on a track?

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• Display large amount of data to client through pagination

  - by ebram tharwat

  I have a web application in which i need to show a big number of data or records for clients. Now i 'll use pagination but i was wondering should I: Load all the data once then pagination, sorting and sarching 'll be easy..But it 'll takes big time(using local DB it takes up to 9 sec.) Or each time i show new page(from the pagination) i make a new request to server and then new request to DB to get the next records..But then what if the client click on Prev button, i 'll make a new request to get data that I had previously..Should i cach data that are loaded before and how if that's good technique? So load all data once or make a new request every time i need data that maybe have been loaded before. I'm using ASP.NET MVC SPA with durandaljs and knockoutjs

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• Why I loose my page rank after 301 redirect?

  - by rajesh.magar

  As we all know Google treat sub-domain as completely separate domain so we have to fight for both, to get ranked in search results. Right! So one of my client website was like they having "example.com" and "Blog.example.com". So in mind to keep all stuff in one place we redirect "blog.example.com" to "example.com/blog/" But in this case we where loose our pagerank and still wondering where we went wrong or it just take few more time to showoff. so what is the reason behind this will be. Thanks in advance.

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• redirecting subdomain to root index.php

  - by niku

  I am new to this. Here is the situation and wondering if someone can suggest best solution to it. I have domain "www.mydomain.com" where I have magento website running, we are in development stage so I did URL forwarding "www.mydomain.com" to "www.mydomain.net" and we have under-construction page on "www.mydomain.net'. Because we do not want to show development. I also have subdomain "beta.mydomain.com" which I pointed to "www.mydomain.com/index.php" which works fine. But how can I show this without changing URL in browser from "beta.mydomain.com" to "www.mydomain.com/index.php" this we want to show our development to management.

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• Learning to program without a computer

  - by ribrdb

  I have a friend in prison who wants to learn to program. He's got no access to a computer so I was wondering if people could recommend books that would be a good introduction to programming without requiring a computer. Obviously he's going to need to keep learning once he gets out and has access to a computer, but how should he get started now (he's got lots of free time to read). Based on his goals I think ruby or javascript/html5 might be good paths for him to start down, but really for now it's most important to explain the ideas. Even if it's all pseudocode. These need to be physical publications, paperbacks are preferred, and consider that he's got limited shelf space so large books could be a problem.

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• PHP user created function return values problem

  - by faX

  Okay I'm new here and I have been trying to figure this out all day I have two functions one calling the other but my functions only returns the last value for example 29 when it should return multiple values. As wondering how can I fix this problem so that my functions return all the values. Here is my PHP code. function parent_comments(){ if(articles_parent_comments_info($_GET['article_id']) !== false){ foreach(articles_parent_comments_info($_GET['article_id']) as $comment_info){ $comment_id = filternum($comment_info['comment_id']); reply_comment_count($comment_id); } } } function reply_comment_count($parent_id){ if(articles_reply_comments_info($_GET['article_id']) !== false){ foreach(articles_reply_comments_info($_GET['article_id']) as $reply_info){ $comment_id = filternum($reply_info['comment_id']); $reply_id = filternum($reply_info['parent_id']); if($parent_id === $reply_id){ reply_comment_count($comment_id); } } } return $comment_id; }

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• Does e-commerce platform matter for customers

  - by c s h

  The place I work is now looking into developing a new e-commerce site on the Magento platform. Magento will fill all of our needs. I was just wondering if it is in anyway unprofessional doing it this way (Impression is something we are really worried about), will people who visit the site look at our business different knowing we used Magento or any other e-commerce platform. There are ways to find out. I use Chrome Sniffer to find out what platforms are used to develop each site, there are other tools available for different browsers.

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• XORG Issues- reported bug, what next

  - by user94927

  On Ubuntu 11.10 64 bit, after watching a video on VLC, I started getting screen freezes and unresponsive keyboard, and the mouse moves but clicking it doesn't do anything. I created a bug (1055240) and provided additional information but I'm not sure what happens next. I ran apport-collect 1055240 as suggested and somewhere during that process it told me to ask my question on Ask Ubuntu. So I'm wondering if y'all can tell me what I need to do? AFAIK I have provided the additional information that was requested. My PC is getting close to the point of becoming unusable- I just don't know which flash video is going to be the next one to cause it to lock up :-(

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• Scalability of multi-threading in game server

  - by Taylor Hill

  What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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• Ubuntu 13.10 vs 12.04 LTS

  - by Shaun

  I am migrating my workflow to ubuntu from windows. I have a macbook pro at home and I really enjoy being able to use the workspaces feature on ubuntu to increase my productivity. As myself being someone that isn't very familiar with doing command line things and hasn't worked with linux a whole lot other than doing basic commands like cd, ls, rm, screen, and sudo. I was wondering what you think would be the best choice for a ubuntu version. I am looking for ease of use as well as stability. I spend most of my time working with eclipse, as well as writing documents. On a side note, right now I have a pretty high end workstation, but I am using a crappy notebook 2.5 inch 1TB hard drive for my system. Would it be worth it to switch to a top of the line SSD, or would the difference not really be noticeable? How difficult would it be for a newcommer to setup the system with the os and important folders running on a SSD and then other folders for storage running on a HD.

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• Do you have any offers in hand [closed]

  - by akp

  Recently, I was asked by an interviewer that - "Do you already have any job offer in hand ?". I am wondering, what could be the intention behind asking this question. What the answer suggests to interviewer? I mean what kind of information he wants dig through this question? YES answer - Does this means that the candidate already has an offer,.. so he wont take this offer seriously and turn out to somebody else. OR No answer - Does this means that candidate is not able to get through any of the interviews before.. Help me to understand this ..

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• Advice on what to learn? [closed]

  - by ICTech

  Currently I work as a .NET C# programmer, quite fresh faced at that (only been working professionally for 8 months) I'm enjoying what I'm doing, but I'm now thinking ahead for other languages to learn. I've heard from quite a few seasoned developers that they reckon it's worth getting in to HTML5. Before I asked this question I read a few of the other questions similar to this, but most were dated back a few years. I'm wondering what your advice would be to an aspiring programmer, what I should avoid going for (i.e. as I understand it Flash is essentially going to be phased out due to HTML5) I was looking in to WPF and the more updated .NET technologies, but someone advised me that WPF stuff will probably be redundant in the future. Thanks for your advice and opinions :)

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• What's your advice in getting Oracle Certified Professional Java Programmer certificate?

  - by den-javamaniac

  Hi. I'm intending to get the certification but not completely sure how to time effectively prepare myself. So I'm wondering if I can be advised on the matter, in particular I would like next questions to be answered: - What the basic learning/practicing plan should look like? - What book (set of books) should be considered? - What practical exercises should be performed? NOTE: I've got several years of corporate experience (mostly web apps, though), but I want to be 100% sure I'll pass the test (that's the reason the issue is raised).

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• Android design advice - services & broadcast receivers

  - by basudz

  I'm in the process of learning the Android SDK and creating some projects to get a grasp on the system. The current project I'm working with works just fine but I'd like to get some advice about other ways I can go about designing it. Here's what it needs to do. When a text message is received from a specific number, it should fire off a toast message that repeats at a certain interval for a specific duration. To make this work, I created an SMS BroadcastReceiver and checked the incoming messages for the number I'm looking for. If found, an IntentService would be started that would pull out the interval and duration from saved shared prefs. The IntentService would then fire off a broadcast. The BroadcastReceiver for this would catch it and use the AlarmManager to handle the toast message repetitions. This all works just fine, but I'm wondering if there's a cleaner or more efficient way of going about doing this? Any suggestions or advice?

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• Easiest Way to Get Started With 3D?

  - by ryebread761

  I'm looking at getting into 3D game development and am wondering what would be the best, quickest engine to get started with. I need to be able to develop on a Macintosh with it. I know Java, and PHP mainly but have worked in many others. At this point, I feel I can adapt to most languages quite easy. So the programming language doesn't really matter to me. I've sorta kinda tried unity in the past and wasn't all too fond of it, so it's kind of a "I can't find anything better" resort. I'm hoping with how open I am I will find something I like more. Thanks in advance.

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