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• gkSudo fails with critical error

  - by Chud37

  I am trying to run gkSudo. This is my second day as a linux user. Yesterday I could do gksudo gedit and input my root password fine. Today, when i run that, the GUI comes up and ask's for my password, however then the program fails to run and all I get is: (gksudo:3262): GLib-CRITICAL **: g_str_has_prefix: assertion `str != NULL' failed I cannot sudo, I cannot su, i can't do anything. I am trying to add myself to the sudoers file but i can't even view it without being root. What can I do?

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• Free eBooks from Microsoft&ndash;We like free!

  - by Jim Duffy

  In a recent blog post I mentioned the availability of the Programming Windows Phone 7 ebook by Charles Petzold. Well I have good news, there are a number of additional FREE ebooks available from Microsoft to help you continue honing your tech skills. Moving to Microsoft Visual Studio 2010 Introducing Microsoft SQL Server 2008 R2 Own Your Future: Update Your Skills with Resources and Career Ideas from Microsoft Understanding Microsoft Virtualization Solutions (Second Edition) First Look Microsoft Office 2010 Windows 7 troubleshooting tips Introducing Windows Server 2008 R2 Deploying Windows 7, Essential Guidance I, for one, appreciate Microsoft making these resources available for free. I think it demonstrates their interest making sure we as developers and I.T. professionals have the resources we need to effectively solve the business problems we encounter. Have a day.

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• Handling Players, enemies and attacks in HTML5

  - by Chris Morris

  I'm building a simple (currently) game with free roaming player and monsters on a map built by a 2D grid. I've been looking at the methods for implementing characters and enemies onto the screen and I've seen two seperate methods for doing this online. Drawing the player onto the screen canvas directly and refreshing the entire screen every FPS tick. Having a separate canvas to handle the player and moving the player canvas on top of the screen canvas via absolute positioning. I can see some pros and cons of both methods but what is generally the best method for doing this? I assume the second due to not having to drain resources by refreshing the map when the user is not moving, but the type of game will generally have constant movement.

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• How to deal with social login

  - by Matteo Pagliazzi

  In my new web app I'm going to allow social login through Twitter (maybe), Facebook and Google and I'm in search of the best way to do it. Actually I'm using Rails with Devise + Omniauth and this is the problem: Should I ask the user to choose a password so that he can login without a social network? Or maybe the user should be able to set a password if he want (for example when editing his account?) The second way seems the best one but since Twitter doesn't provide user email and google doesn't provide an username I'll probably have to ask the user for username/email when he log in so in that case I may also ask for the password... waht do you think?

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• Maximized Office 2007 gets cut off on multi-monitor setup with different resolutions

  - by Adam M-W

  I've got an external monitor plugged into my laptop that I like to use for typing up documents, but I've noticed that when Word is maximized it gets cut off at where the primary monitor's bounds are. Is this a bug in Wine (i'm using version 1.3.32), or with my Window Manager (metacity with compositing enabled, version 2.34.1), with my graphics drivers (nouveau) or something else? I know that I can fix it by unmaximizing (it doesn't get cut off and I can resize to the entirety of the second monitor), but it keeps on maximizing itself as it (rightly so) knows that it should be taking up the entire screen. I don't really want to use the "Emulate a virtual desktop feature", I would prefer to find the source of this issue.

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• How to "cast" from generic List<> to ArrayList

  - by Michael Freidgeim

  We are writing new code using generic List<> , e.g. List<MyClass>.   However we have legacy functions, that are expect ArrayList as a parameter. It is a second time, when I and my colleague asked, how to "cast" generic List<MyClass> to ArrayList. The answer is simple- just use ArrayList constructor with ICollection parameter. Note that it is not real cast, it  copies  references to ArrayList. var list=new List<MyClass>(); //Fill list items ArrayList al=new ArrayList(list);//"cast"-

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• Align tetrahedrons

  - by thedeadlybutter

  I'm currently generating tetrahedron meshes in Unity When a player clicks the side of a mesh, a new one spawns aligned with it, like this. I'm not sure how nor can I find any information on implementing a tetra hedron grid. I tried playing around with the vertices until I realized I need to adjust position & rotation. Any ideas? EDIT: To be clear, the second image was manually placed objects in the Unity Editor. I'm looking to make an algorithm that places the meshes correctly.

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• Google indexed my main site's content under subdomains

  - by Christie Angelwitch

  Google is indexing top level domain content as though it belongs on subdomains and I want to disable this. My site has wildcards enabled and we also have two subdomains with unique content. The first subdomain serves as a blog, the second one has only one page. Both have backlinks. Google has indexed content from the main site under the subdomains as well. Let's say that we have a page at example.com/page.html . The same page has also been indexed as subdomain.example.com/page.html as well and sometimes ranks better than the one located at the main site. The thing is that we never placed this content at the subdomain. I've thought about adding canonical tags at the subdomains to help with the duplicate content issue. How can I stop Google from indexing those pages? I don't even know how Google found those, since we never placed them at the subdomains.

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• Why is my fan constatnly blowing in Ubuntu?

  - by Derfder

  I have installed Ubuntu 13.04 (64-bits) alongside Windows 7 on different partition on my second desktop. It's working nice. I have updated everything. However, I have problems with my fan. It's blowing non-stop and very fast(loud). I haven't these problems in Windows 7 where it works nicely. How to update drivers for my fan or something else? My desktop is: HP Pro 3410 Microtower PC. Graphic card: AMD Radeon HD 6570 Board: 2A9C 1.1 Bus Clock: 133 megahertz BIOS: American Megatrends Inc. 6.14 11/05/2010 Processor: 3,20 gigahertz Intel Core i3 550 DRIVERS I HAVE TRIED FOR MY GRAPHIC CARD: I have tried these drivers so far: xserver-xorg-video-ati, version: 1:7.1.0-0ubuntu2 fglrx Version: 2:9.010-0ubuntu3 fglrx-updates Version 2:9.012-0ubuntu1 But the fan is still blowing like a maniac. I have tried to install Linux Mint 15 previously and I have had the same problems with the fan. Any idea how to fix it?

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• Ultra-quick Samsung WebKit review

  On Thursday I got a Samsung bada test phone (the Wave) that runs the latest installment of Samsung WebKit, and of course I subjected it to various tests. The verdict is clear: excellent browser. As far as I’m concerned it ousts Opera Mobile from my personal top three.Judge for yourself. This is what the latest Samsung WebKit supports: It scores second, after Safari 4 for desktop, in my great WebKit test. It leaves both iPhone and Android in the dust; although I haven’t yet tested Android 2.1 and...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Brevets : RIM signe un accord de licence avec Microsoft pour l'utilisation d'exFAT dans ses terminaux mobiles

  Brevets : RIM signe un accord de licence avec Microsoft pour l'utilisation d'exFat dans ses terminaux mobiles RIM (Research In Motion) vient de signer un accord de licence avec Microsoft pour l'utilisation du système de fichiers moderne exFAT. RIM est dans la tourmente depuis plusieurs mois. Le constructeur canadien du BlackBerry a enregistré des fortes baisses de son chiffre d'affaires et de sa part de marché dans le secteur du mobile. Selon les chiffres publiés par IDC pour le second trimestre 2012, RIM détient une part de marché de 4,8%, soit en chute de 40,9% par rapport à la même période de l'an dernier. T...

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• How to fix? Gnome-shell shows up and instantly stop working

  - by Dario

  I am using ubuntu 12.04, but I love gnome shell, but not the Gnome Classic which comes installed. When I reinstalled, I instantly installed Gnome-shell by terminal using Unity, it worked for a while and then I started installing some extensions. I rebooted and it just stopped working, it shows up for a second, then I can only see my desktop with icons but without panels and I can't even use the terminal (CTRL + ALT + T) since the window doesn't really select when I click it. How could I fix this? I tried reinstalling Gnome-shell and all the stuff I installed for it, but now it doesn't work even without any extension.

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• Limited resource practice problems?

  - by Mark

  I'm applying for some big companies and the areas I seem to be getting burned on is problems involving limited memory, disk-space or throughput. These large companies process GBs of data every second (or more), and they need efficient ways of managing all that data. I have no experience with this as none of the projects I have worked on have grown that large. Is there a good place to learn about or practice these sorts of problems? Most of the practice-problem sites I've encountered only have problems where you have to solve something efficiently (usually involving prime numbers) but none of them limit your resources.

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• SQLite with two python processes accessing it: one reading, one writing

  - by BBnyc

  I'm developing a small system with two components: one polls data from an internet resource and translates it into sql data to persist it locally; the second one reads that sql data from the local instance and serves it via json and a restful api. I was originally planning to persist the data with postgresql, but because the application will have a very low-volume of data to store and traffic to serve, I thought that was overkill. Is SQLite up to the job? I love the idea of the small footprint and no need to maintain yet another sql server for this one task, but am concerned about concurrency. It seems that with write ahead logging enabled, concurrently reading and writing a SQLite database can happen without locking either process out of the database. Can a single SQLite instance sustain two concurrent processes accessing it, if only one reads and the other writes? I started writing the code but was wondering if this is a misapplication of SQLite.

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• Installing Ubuntu 12 on SATA III drive

  - by Jared

  I am trying to install Ubuntu 12.04 on a SATA III drive however the installer will not recognize my drive in the guided (dual-boot) install. I have changed the controller from IDE to AHCI to no avail, the install still will only recognize my very small second drive that is plugged into a SATA II port. The thing is, the unguided install sees this drive just fine, I just am not sure enough of what I'm doing to feel safe installing via this method. Is there a fix for this beyond plugging my drive into a SATA II port? I really would like to avoid this because of my terrible cable management skills it would be a huge pain to switch it over.

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• Learning Zend Framework 1 or 2?

  - by ehijon

  I have programmed for a few years in php and now I'm going to learn zend framwork. Zend is very popular and there are a lot of tutorials, books and documentation out there. But I saw in the last months that there is a second version of Zend, but it's not so used and popular, not yet. I think it is better to start with a new version, but I don't know what to do now, as when I see job offers many people require the first version. Which version do you suggest me?

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• Transmitting Form Data from the Client to the Web Server

  The steps involved in transmitting form data from the client to the web server User loads web form User enters data in to web form fields User clicks submit On submit page validates fields using JavaScript. If validation errors are found then the validation script stops the browser from canceling posting the data to the web server and displays error messages as needed If the form passes the data validation process then the browser will URL encode the values of every field and post it to the server.  The server reads the posted data from the query string and then again validates the data just to ensure data consistency and to prevent any non-validated data because JavaScript was turned off on the clients browser from being inserted in to a database or passed on to other process If the data passes the second validation check then the server side code will continue with the requested processes

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• Getting started with the G1 Garbage Collector

  - by mikew_co

  Just before the Thanksgiving break I finished up my second Oracle by Example (OBE) course on garbage collection. This one is on the new G1 garbage available in Java 7. It provides and introduction and overview of this newly available collector. Here is the link to the course: Getting Started with the G1 Garbage Collector This is a follow up to this OBE on the basics of garbage collection. Garbage Collection Basics The OBE is based on the presentation given by Charlie Hunt and Monica Beckwith at this years Java One. Hopefully I have done justice to there most excellent session. As always, feedback and comments are welcome.

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• Power management issues on an Asus N55

  - by Andrea Borga

  I noticed that with respect to Win7 on my Asus N55 Ubuntu 12.04 tend to overheat the system. After startup the fan controller takes control of the fan, I could here it slowing down, after a few second following a login the fan increases its speed again. Though there are no processor hungry process: top shows only Xorg consuming 4%. Even with the system monitor the CPUs load look ok. Is it a power management related problem? This can cause battery life troubles in general, and electronics is never happy to be overheated. Is there a better tool to root the cause of the issue?

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• Split vector vs matrix notation for transformation

  - by seahorse

  Some rendering engines like Ogre prefer to use a individual vector based notation for transformations like the following Split vector notation: Net Transformation is represented by Scale vector = sx, sy, sz Transformation vector = tx, ty, tz Rotation Quaternion Vector = w,x,y,z Matrix notation: There are other engines which simply use a net combined transformation matrix. What are the advantages of the first notation over the second? Also for animation interpolation does it work in the first notation that we interpolate across the individual components and use the interpolated parts to get the net transformation? Is this another advantage?

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• "has no motion" warnings

  - by Adam R. Grey

  When I reimport my project's Library, I get lots of warnings such as State combat.Ghoul Attack has no motion but I have no idea why. In this specific case, I looked up Ghoul Attack. Here's the state in which it appears, in the only animator controller that includes anything called Ghoul Attack: State: m_ObjectHideFlags: 3 m_PrefabParentObject: {fileID: 0} m_PrefabInternal: {fileID: 0} m_Name: Ghoul Attack m_Speed: 1 m_CycleOffset: 0 m_Motions: - {fileID: 7400000, guid: 0db269712a91fd641b6dd5e0e4c6d507, type: 3} - {fileID: 0} m_ParentStateMachine: {fileID: 110708233} m_Position: {x: 492, y: 132, z: 0} m_IKOnFeet: 1 m_Mirror: 0 m_Tag: I thought perhaps that second one - {fileID: 0} was throwing up the warning incorrectly, so I removed it. There was no effect, I still get warnings about Ghoul Attack. So given that the only state I know of with that name does in fact have motion, what is this warning actually trying to tell me?

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• Is committing/checking code everyday a good practice?

  - by ArtB

  I've been reading Martin Fowler's note on Continuous Integration and he lists as a must "Everyone Commits To the Mainline Every Day". I do not like to commit code unless the section I'm working on is complete and that in practice I commit my code every three days: one day to investigate/reproduce the task and make some preliminary changes, a second day to complete the changes, and a third day to write the tests and clean it up^ for submission. I would not feel comfortable submitting the code sooner. Now, I pull changes from the repository and integrate them locally usually twice a day, but I do not commit that often unless I can carve out a smaller piece of work. Question: is committing everyday such a good practice that I should change my workflow to accomodate it, or it is not that advisable? ^ The order is more arbitrary and depends on the task, my point was to illustrate the time span and activities, not the exact sequence.

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• Starting java processes with Upstart

  - by user265330

  I want to start a java process using Upstart. Currently, on our OpenSuSE servers, I use the System V init system to achieve this, but on our Ubuntu servers I'd rather use Upstart. But I have two questions... I have an Upstart job (a task) that configures the server, called, say, myconfig. And in the job that starts my java processes I ostensibly have: start on stopped myconfig exec /path/to/myjavastartscript.sh myjavastartscript.sh runs 'java -classpath blah MyClass'. In System V init, starting the service runs 'nohup /path/to/myjavastartscript.sh &'. So my first question is whether I still need to do the nohup or run-in-background with the exec command? When running, MyClass starts other Java processes. In System V init, the service stop just looks for java processes owned by a certain user and kills them. My second question is how could I control the termination of these processes with Upstart?

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• Why does Java allow to implement different interfaces, each containing a method with the same signature?

  - by Software Engeneering Learner

  I've recently found that I can have two interfaces containing method with the same signature as a method in the other interface. And then I can have an interface or class that implements both of that interfaces. So the descendant class/interface has implicitly implements two different methods as a one method. Why is this allowed in Java? I can see a numerous problems that arises from that. Even eclipse only can find out about implementations for only one interface method, but for the second one it doesn't show any implementations at all. Also I believe there would be problems with automatic refactoring, like when you would like to change the signature of the method in one of the interfaces and IDE won't be able to correctly change that signature in all implementations, as they implement two different interfaces and how will IDE know what interface method it implementation descends. Why don't just make a compiler error like 'interfaces method names clashes' or something like that?

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• Java based webservices

  - by java_mouse

  We are working on a big java project and as a second phase in this project, we will have to develop some web services that the clients can call and get or update the data in our database. Though I have been a Java programmer for a while, I have never worked on web services yet. I develop EJBs, data services layer etc but have not worked in web services yet. What are the current standards in developing web services in Java platform? What is the best and recommended way for developing web-services? Any input/link will be appreciated

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