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• What expectation should I have of South African web development rates / duration? [closed]

  - by Warren van Rooyen

  I am a developer but only intend on doing the front-end work for getting Reddit-like upvote / downvote functionality going on an upcoming site I'm building. I have never had to contract a developer for back-end work to implement code for me so I am quite in the dark on how much I should expect to pay and how long it could take to get the site going. I could be taken for a ride as the developer could distort the time it would take at a seemingly regular rate (hourly/day) or could otherwise distort their rate. Please could you give me help on this. I know you need some guidance on the nature of the site so here it is. I have a Reddit type template with CSS and PHP included. I then downloaded Pligg code that's intended to do the job of the Reddit upvote downvote functionality. How long would a developer roughly need to unite the theme and front end with the back-end functionality? I do understand it's not a lot of info but I'm sure you're experienced enough to have an instinct for the size of the project. Also, should I work on an hourly/day rate/ project payment agreement?

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• Ubuntu on a USB

  - by Sander de Lange

  I was just wondering if anyone had a good experience with Ubuntu on a flash drive... I'm installing it right now. I formatted my 16GB flash drive to Ext2 because the default file system is ext4 but that one is journaled and USB flash drives do not like journaling. I want to use this to learn Java and Ubuntu seems to be a great OS for this. I (obviously) have USB 2.0 ports where I will put the USB in. How is the boot time of Ubuntu on a USB?

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• Greek Letters rendered incorrectly in LibreOffice

  - by Matheus de Araújo

  Using an old archive that I have (with Maxwell's equations), the Greek letters display as squares. I tried to change something in the alphabet but even the fonts don't have any Greek letters (they appear like squares too), both Greek and iGreek letters packages. Sounds like a package that's not installed, or corrupted. I still re-downloaded and reinstalled LibreOffice. I don't know what I have to install. The equations look fine in OpenOffice.org (I made the file with it). What should I do?

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• Object oriented EDI handling in PHP

  - by Robert van der Linde

  I'm currently starting a new sub project where I will: Retrieve the order information from our mainframe Save the order information to our web-apps' database Send the order as EDI (either D01b or D93a) Receive the order response, despatch advice and invoice messages Do all kinds of fun things with the resulting datasets. However I am struggling with my initial class designs. The order information will be retrieved from the mainframe which will result in a "AOrder" class, this isn't a problem, I am not sure about how to mold this local object into an EDI string. Should I create EDIOrder/EDIOrderResponse/etc classes with matching decorators (EDIOrderD01BDecorator, EDIOrderD93ADecorator)? Do I need builder objects or can I do: // $myOrder is instance of AOrder $myOrder->toEDIOrder(); $decorator = new EDIOrderD01BDecorator($myOrder); $edi = $decorator->getEDIString(); And it'll have to work the other way around as well. Is the following code a good way of handling this problem or should I go about this differently? $ediString = $myEDIMessageBroker->fetch(); $ediOrderResponse = EDIOrderResponse::fromString($ediString); I'm just not so sure about how I should go about designing the classes and interactions between them. Thanks for reading and helping.

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• Is it convenient to use a XML/JSON generated based system? [closed]

  - by Marcelo de Assis

  One of my clients insists that we missed a requisite for the project(a little social network, using PHP + MySql), is that all queries are made from XML / JSON static files (using AJAX) and not directly from the database. Edit: The main reason, stated by client, is a way to economize bandwith. Even the file loading, has to be using AJAX, to avoid server side processing. We will still use a database to store and insert data. These XML / JSON files will be (re) generated whenever any data is changed by CMS or users. As the project was developed without this "technique", we'll have a lot of work ahead, so I would like to avoid that. I'm asking if it's convenient to use a XML generated based system, because I think a database is already "optimized" and secure to deal with a lot of data traffic. Other issue I'm afraid of, is a chance of conflict when a user is trying to read a XML/JSON which is being just generated.

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• If you had three months to learn one relatively new technology, which one would you choose?

  - by Ivo van der Wijk

  This question was taken from CodingHorror. On my list would be (and some actually are): Android Development (and possibly iPhone development) Go language and its concurrency NoSQL, specifically CouchDB RCTK, which happens to be my own idea / project (but all ideas have been thought or already, what matters is my implementation) But I don't think I'm being cutting-edge/thinking-outside-the-box here. What's on your list? Please don't restrict yourself to the list above - that's my list. I'm interested in hearing what others find interesting new technology.

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• Liskov principle: violation by type-hinting

  - by Elias Van Ootegem

  According to the Liskov principle, a construction like the one below is invalid, as it strengthens a pre-condition. I know the example is pointless/nonsense, but when I last asked a question like this, and used a more elaborate code sample, it seemed to distract people too much from the actual question. //Data models abstract class Argument { protected $value = null; public function getValue() { return $this->value; } abstract public function setValue($val); } class Numeric extends Argument { public function setValue($val) { $this->value = $val + 0;//coerce to number return $this; } } //used here: abstract class Output { public function printValue(Argument $arg) { echo $this->format($arg); return $this; } abstract public function format(Argument $arg); } class OutputNumeric extends Output { public function format(Numeric $arg)//<-- VIOLATION! { $format = is_float($arg->getValue()) ? '%.3f' : '%d'; return sprintf($format, $arg->getValue()); } } My question is this: Why would this kind of "violation" be considered harmful? So much so that some languages, like the one I used in this example (PHP), don't even allow this? I'm not allowed to strengthen the type-hint of an abstract method but, by overriding the printValue method, I am allowed to write: class OutputNumeric extends Output { final public function printValue(Numeric $arg) { echo $this->format($arg); } public function format(Argument $arg) { $format = is_float($arg->getValue()) ? '%.3f' : '%d'; return sprintf($format, $arg->getValue()); } } But this would imply repeating myself for each and every child of Output, and makes my objects harder to reuse. I understand why the Liskov principle exists, don't get me wrong, but I find it somewhat difficult to fathom why the signature of an abstract method in an abstract class has to be adhered to so much stricter than a non-abstract method. Could someone explain to me why I'm not allowed to hind at a child class, in a child class? The way I see it, the child class OutputNumeric is a specific use-case of Output, and thus might need a specific instance of Argument, namely Numeric. Is it really so wrong of me to write code like this?

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• How to find the window size in XNA

  - by Nick Van Hoogenstyn

  I just wanted to know if there was a way to find out the size of the window in XNA. I don't want to set it to a specific size; I would like to know what dimensions it currently displays as automatically. Is there a way to find this information out? I realize I probably should have found this information out (or set it myself manually) before working on the game, but I'm a novice and am now hoping to work within the dimensions I have already become invested in. Thanks!

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• LibreOffice Math problem with greek letters

  - by Matheus de Araújo

  I've a problem with my LibreOffice. Using an old archive that I have (with the Maxwell's equations), the greek letters are like squares. I tried to change something in the alphabet but even the font don't have any greek letters (they appear like squares too), both Greek and iGreek letters package. Sounds like a packet that isn't installed or corrupted, but I still redownloaded and reinstalled the LO and I don't know whose I have to install. With the OO my equations worked well (I made the file with it). What am I supposed to do?

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• Ubuntu unstable, showing awkward behavior

  - by Christophe De Troyer

  Let me start off by saying that this problem can't be described in such a way that allows me to find other topics, which have some relevance to this problem. That's why I created this question. In case this question might have been asked before, I apologize. So what is the problem: My computer (Intel Core I5 2500K - with HD3000 graphics -, 6 gb DDR, 1 SSD, 3 HDD's and an Asus P8Z68 mobo) runs Windows on the SDD. But I decided to give Ubuntu a chance to be my daily OS for basic needs since it's open source and I find it a handicap of not being able to work with it. I decided to run the windows installer and install Ubuntu 12.04 to my 320 Gb hdd which was not being used in my computer. After installing it and booting it, it worked great! I spent the rest of the day/night using it, and falling for it. Great, today I booted Ubuntu (I had the choice in the bootloader as I expected). It asked me for my login and it started logging in. Now, after a few (literally) minutes of letting it "boot" I tried determining the cause of this. What I've figured out so far: When I left click on my desktop it freezes completely for a few seconds I have something like tearing in the left side menu (in games, you know) when I move my mouse around It runs well when just hovering around with my mouse, but from the point I click on something it freezes. What have I tried? I ran a HD Tune diagnostic on the HDD but the performance seems to be very close to the stock values, so I'm taking it as a good HDD. I'm trying to get to the drivers update panel for Ubuntu, but with the state it's in, it's taking a lot of time.. Could anyone point me in a direction for troubleshooting this? I'm not really a noob at all, just when using Linux.. :) Thanks in advance! Christophe,

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• Can I use Google Search to determine if my website contains original or copied content?

  - by Bas van Vught

  I have a few websites from customers that have (partially) the same content as other websites. I plan on rewriting all content that is not original, but how do I know if my websites have original content, or content that's been copied from another website? My customers say all the content is original, but I have my doubts to be honest. They often let other people who don't work there anymore write content for the sites. What I did so far is copy a line from my website that can be found in other websites as well and pasted it into Google Search. If my website is the first link, would it be considered the original source?

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• Drivers for Ubuntu 13.10 [on hold]

  - by Fernando De Souza Martins

  I just installed Ubuntu 13.10, my screen resolution is not fitting my screen as the ubuntu interface is all around stretching over the screen, so i thought i might install nvidia's driver that i know can let me adjust the exact resolution i need. So i began a 2 hour quest, i downloaded the driver hoping i would have a wizard to instal it, but yeah, so i tried to do a bit of research and i found that feature, i think its called in english additional drivers, but it wont show the nvidia drivers, i tried the terminal, but once i write the commands i found it asks for a password but i cant type anything once the password is asked. So, my question, obviously, how do i install this driver? I am not sure if this is appropriate, but why doesnt ubuntu have a wizard to install things? I feel like im working for the OS, when it should be the other way around, but i love the concept of linux, so im pushing forward and trying to use it. Another thing is, i had to install a bunch of drivers and applications for the drivers in windows, do i need to install any other driver? I cant change my mouse's sensibility in the os, it seems, so how do i do it? I'm sorry i'm asking all of this, but it seems necessary.

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• Power button missing

  - by Christophe De Troyer

  An almost clean install of Ubuntu 13.10 keeps hiding the power button. I noticed before that my clock and power button were missing in the right top corner. I rebooted my system and they were back. Now I see my power button only is missing. How do I go about fixing this? I can't keep rebooting, can I? The latest thing I did was removing Ubuntu One: Removing Ubuntu One I don't think I did something that might've tinkered with these settings though.

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• How to get warnings when compiling fx files

  - by jdv-Jan de Vaan

  When I compile DirectX shaders (.fx files), I dont see any compiler warnings unless there was an error in the effect. This happens both when using the offline FXC compiler, as well as calling SlimDx's CompileEffect (which is what we normally do). I could force warnings as errors (/WX), but if you enable that, you get an error that compilation failed, without the warning that caused the problem. So how can I output warnings for shaders that compile properly?

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• Server-infrastructure recommendations

  - by Tim van Elsloo

  Here's the thing: I need a cheap, fast, reliable infrastructure that can dynamically scale (like Amazon S3: cloud-storage). I'm thinking of 3 different type of 'servers'. Application-server Should be able to run CentOS (or another light Linux-distr.) Should be able to run Apache Should be able to run PHP Should be able to run GD (so it does rely on it's cpu). Should be extremely reliable and fast. Database-server Should be able to run MySQL Should be able to... well, do nothing else :P. Should be extremely reliable and fast. Storage-server Should be able to run some kind of file-transfer-deamon (like FTP, CouchDB, etc.) Should be able to do nothing else. Should be extremely reliable and fast. So technically, by transferring all static data to 2 different servers/services, the application-server can totally focus on the webpages. My questions: What services do you recommend? Which is cheaper, faster and more reliable: using my own server, or using some cloud-storage/cloud-computing-service (like Amazon S3, CloudFiles, etc.)? How can I prevent bandwidth abuse (such as dos-attacks causing the bill to be extremely high)? What's the difference between "including CDN" and "excluding CDN"? It seems the price doesn't differ at CloudFiles? Do you have to pay "including CDN" + "excluding CDN" when you decide to enable the delivery-network? Or have you only got to pay "including CDN"? Should I use my own nameserver too or can I use my domain-hoster's nameservers? What are the minimum software specifications of a nameserver. Can I write some software myself? Does anyone have a good protocol-description? I hope you can answer my questions. Answers I shouldn't write my own nameserver-software. Instead, I should use something like bind. (http://osspro.com/2010/05/04/linux-create-your-own-domain-name-server-dns/).

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• What could be the reason for my resolution to be right running 11.10 on VirtualBox and not on machine?

  - by Hadrian de Oliveira

  When I install Ubuntu 11.10 on my VirtualBox (running on Windows 7) and update the packages, it recognizes the display as the VirtualBox display, and gives me the options of various resolutions, one of them being right for my display, all works well. But then, when i install it on my machine (like was Windows 7) it doesn't give me the resolution options, even with the system updated and the openchrome graphics driver installed (which was also when running on Virtualbox). What could be the reason for this happening? (Could the VB guest software influence on this?)

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• Must double-tap Windows key to open Dash

  - by Bart van Heukelom

  I'm experiencing some strange behaviour of the Unity Dash and the Windows/Super keyboard key. As far as I know, normal behaviour is: Tap: Open Dash Hold: Show keyboard shortcut overlay However, the behaviour I'm experiencing is: Tap: Show keyboard shortcut overlay (after a short delay) Double Tap: Open Dash Hold: Show keyboard shortcut overlay What could cause this, and how do I fix it? I'm on a fresh 12.10 (Quantal) installation.

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• I cant install ubuntu 12.04 on my dell latitude d510

  - by Jose de Jesus

  I download the iso from Ubuntu.com and burned into a CD-R with the program in the page. The disc work right in my desktop but when i run it in my laptop appears another menu with the options prove ubuntu, install ubuntu, check the memory, check for errors, and run windows.When i try the option install appears in the screen "Ubuntu" in the center and littles points down (loading) and after 5 minutes the computer freeze. What can i do?

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• How to copy existing movie files on ipad to watch?

  - by Rob Van Dam

  I have an iPad and a desktop running Ubuntu 12.04 with lots of movie files of various formats (avi, mp4, m4v, etc). Is it possible to transfer those files from within linux directly to the iPad (without using iTunes to sync) over USB and then play those movies on the iPad without reformatting/resizing all of them? I've used iTunes in a Windows XP virtualbox instance with other iOS mobile devices before but I would prefer a pure linux approach if possible. (I'm creating this question so that I can share the solution I found because I failed to find a simple, satisfactory answer elsewhere).

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• Loadbalancing Questions

  - by Van Holtz

  I have been learning networking for about 4 months. Wrote a single standalone Multiplayer server and succeeded with authoritative approach. Now I want to extend it by splitting the single server into clusters to allow even more players to log in to avoid latency issues. Now I have protyped the Loadbalancing server and its running pretty good so far. This is my architecture, I have a master server which acts as a proxy, every sub servers(chat, login, game) connect to the master server as well as all the clients. when a client connects, Client Request: Send Request - MS(Master) - Decides which SS(SubServer) to forward to - Forwards Request to SS - SS - Analyze Message - Send Response to MS - Decides which Client to forward to - Forwards Response to Client Well, it looks like its going through lots of stages. it takes double the time to process the message than a single server approach. i feel like my model isnt the best or i may be wrong. is there any better model or the one they use in professional games? I still want a Master-SubServer approach. I just want to clarify that I'm going in the right direction before writing all my codes. Thanks for any answer :)

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• htaccess rewrite doesn't work

  - by Raimond van Mouche

  I'm trying to redirect url's in my /joomla/ folder containing "rsform" to the same url but except for /joomla/ /formulieren/. However my tried .htaccess rewrite doesn't work. I tried: RewriteEngine on RewriteCond %{REQUEST_URI} rsform RewriteRule ^(.+)$ http://watervriendengeleen.nl/joomla/ [L,R=301] And other URL related rewrites like Redirect /joomla/index.php?option=com_rsform&formId=12&Itemid=99999 http://sitename.com/formulieren/index.php?option=com_rsform&formId=12&Itemid=99999 which didn't work either. Any thoughts?

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• New "delay" keyword for JavaScript

  - by Van Coding

  I had a great idea for a new javascript keyword "delay", but I don't know what I can do to bring it to the new specification. Also I want to know what you guys think about it and if it's even realistic. What does the delay keyword ? The delay keyword does nothing more than stop the execution of the current stack and immediately continues to the next "job" in the queue. But that's not all! Instead of discarding the stack, it adds it to the end of the queue. After all "jobs" before it are done, the stack continues to execute. What is it good for? delay could help make blocking code non-blocking while it still looks like synchronous code. A short example: setTimeout(function(){ console.log("two"); },0); console.log("one"); delay; //since there is currently another task in the queue, do this task first before continuing console.log("three"); //Outputs: one, two, three This simple keyword would allow us to create a synchronous-looking code wich is asynchronous behind the scenes. Using node.js modules, for example, would no longer be impossible to use in the browser without trickery. There would be so many possibilites with such a keyword! Is this pattern useful? What can I do to bring this into the new ECMAscript specification? Note: I asked this previously on Stack Overflow, where it was closed.

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• What could be the best way to generalize data from Facebook and Twitter?

  - by Sjaak van der Heide

  I am not sure if this is the best subsite to ask this question, but I'm pretty sure it doesn't fit on the normal or facebook SO page... I've been asked to make a general API for connecting to several Social Media platforms (at the moment Facebook and Twitter). I have already realised both of them seperately. Meaning I retrieve the data I need from both Facebook and Twitter and hold the data in it's own dataclass. In my case a list of FacebookTimelineItems and a list of TwitterTimelineItems. now the hard part is taking the parts that are used in both (username, id, message and such) and make 1 general class that is eventually passed on to who/whatever sent the call to my API. these are two pics of the data classes I have: http://imageshack.us/photo/my-images/703/facebookdata.png/ http://imageshack.us/photo/my-images/204/twitterdata.png/ probably not 100% correct but it gives an idea what it looks like. Now I've been having several idea about how to go about and generalize the two, which is harder then I thought at first. Create an interface (TimelineItem) and let the other classes extend that one. this way I'll always be sure I have a class that contains at least the basic info I need. downside is that deserializing the JSON seems to be a nightmare. Use the two dataclasses I have and combine them into a new class afterwards, then pass that one back to whoever requested it. This would probably work but I get the idea it's not the best way to tackle this problem, and is pretty dodgy IF I get it working. Or, in case of the other two being nearly impossible. Keep the two seperated in the front end, and go sit in the corner crying because I've just figured out you can't lump together facebook and twitter... Note: I don't have to make the front end part (view), I just make sure the Model is nicely filled with data :) I hope I placed this in the right section, if I didn't I apologise and would like to know where I should go with my question. Thanks in advance for any replied/ideas/opinions on this.

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• Looking for a customizable "Did you know..." dialog application

  - by Jorge Suárez de Lis

  I want to deploy a "Did you know..." or "Tip of the day" application at the office. It should: Show a dialog at login time with a random tip. Obviously, provide some way to store my own tips. Be easy to disable and reenable by the user itself. I'm using puppet, so I'm covered with the deployment. The tips don't even need to be gathered from a server, since I can deploy the newest tips file/database with no costs. Sure, I could hack a quick solution by using zenity and bash, but I'd like to know if there's any application out there specifically targeted at this. I don't like the zenity approach very much because it's very limited on the contents that can be displayed. No text alongside screenshots, for example. Zenity is aimed towards displaying simple dialogs.

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• How to keep a generic process unique?

  - by Steve Van Opstal

  I'm currently working on a project that makes connection between different banks which send us information on which that project replies. A part of that project configures the different protocols that are used (not every bank uses the same protocol), this runs on a separate server. These processes all have unique id's which are stored in a database. But to save time and money on configurations and new processes, we want to make a generic protocol that banks can use. Because of PCI requirements we have to make a separate process for every bank we connect to. But the generic process has only 1 unique identifier and therefor we cannot keep them apart. Giving every copy of that process a different identifier is as I see it impossible because they run entirely separate. So how do I keep my generic process unique?

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