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• Is the C programming language still used?

  - by Pankaj Upadhyay

  I am a C# programmer, and most of my development is for websites along with a few Windows application. As far as C goes, I haven't used it in a long time, as there was no need to. It came to me as a surprise when one of my friends said that she needs to learn C for testing jobs, while I was helping her learn C#. I figured that someone would only learn C for testing only if there is development done in C. In my knowledge, all the development related to COM and hardware design are also done in C++. Therefore, learning C doesn't make sense if you need to use C++. I also don't believe in historic significance, so why waste time and money in learning C? Is C is still used in any kind of new software development or anything else?

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• "Unrecoverable error" during installation

  - by Sal

  I have an old Dell computer and I want to switch from windows xp and install the new ubuntu. I have tried multiple times to download it via cd-r but keep getting the same error message: unrecoverable error. The error happens after the menu which lists try ubuntu, install ubuntu, etc.It only gets as far as the Screen with a toolbar on the top that includes power, sound, and two arrows. That is when the message displays. switching to desktop version to find what the problem is( or something like that.) What is going wrong?

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• Google I/O 2010 - OpenID-based SSO & OAuth for Google Apps

  Google I/O 2010 - OpenID-based SSO & OAuth for Google Apps Google I/O 2010 - OpenID-based single sign on and OAuth data access for Google Apps Enterprise, Google APIs 201 Ryan Boyd, David Primmer A discussion of all the auth tangles you've encountered so far -- OpenID, SSO, 2-Legged OAuth, 3-Legged OAuth, and Hybrid OAuth. We'll show you when and where to use the APIs, code some example apps, and demonstrate how they all integrate with Google APIs and other developer products. We'll also talk about how these technologies relate to apps sold on the Google Apps Marketplace. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 8 0 ratings Time: 01:11:01 More in Science & Technology

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• Programming in the United States Airforce - How hard to get a job doing it? [closed]

  - by Holland

  I already know how to program. Been at it for a year; the language I've worked mostly with has been C++, and I'm currently studying x86 assembly programming, with the goal to move towards ARM assembly after I've finished with that. Thus, given my experience and knowledge, I'm curious to know if any "vets" around here have had any excursions in the military doing software/electrical engineering, and how hard it would be to actually get a job doing it - with someone who already has previous experience and knowledge regarding that field, however slight. By definition of "hard", in this context, I suppose I'd be referring to the required knowledge to actually be a "shoe-in" for both low level and high level software/hardware applications. I know hex fairly well, and enough to convert that hex to binary. I also have an ok knowledge of algorithms, such as Binary Search Tree, Linked List, etc. Everything I've learned so far has been self taught for the most part.

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• Architecting multi-model multi-DB ASP.NET MVC solution

  - by A. Murray

  I have an ASP.NET MVC 4 solution that I'm putting together, leveraging IoC and the repository pattern using Entity Framework 5. I have a new requirement to be able to pull data from a second database (from another internal application) which I don't have control over. There is no API available unfortunately for the second application and the general pattern at my place of work is to go direct to the database. I want to maintain a consistent approach to modeling the domain and use entity framework to pull the data out, so thus far I have used Entity Framework's database first approach to generate a domain model and database context over the top of this. However, I've become a little stuck on how to include the second domain model in the application. I have a generic repository which I've now moved out to a common DataAccess project, but short of creating two distinct wrappers for the generic repository (so each can identify with a specific database context), I'm struggling to see how I can elegantly include multiple models?

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• Are there any non-self-taught famous programmers? [closed]

  - by Jon Purdy

  It seems to me that being a self-taught programmer has significant advantages over picking it up only in higher education. Not only does a self-taught developer have a headstart on their 10 000-odd hours of mastery, but their hobby demonstrates genuine interest. This will likely lead to a process of continuous self-improvement over their career, not to mention increased likelihood of producing personal projects that are worthy of fame. A programmer who spends four years in study (not nearly all of which is going to be directly concerned with programming) has far less leisure to explore and learn independently than does a developer who starts college with even a few years of dedicated hobbyist study. I wonder whether there are any famed developers who had no exposure to programming before deciding to study it in university. I simply doubt that an 18-year-old has the capacity to become a brilliant programmer with no prior experience, but that seems like an awfully elitist and unpleasant view, so I'd like to be proven wrong.

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• Articles on TFS Build Server / MSBuild

  - by MartinWatts

  I have decided to write some articles on using a TFS Build Server. During the past few years I have had the responsibility and challange of keeping one running, and I found out that on some subjects, there is very little to find on the internet. So hopefully my experiences can help others. That is, before VS 2010 build server makes everything we have learnt on MSBuild so far redundant. ;) The first article is about selectively getting the sources you need to get the build done. You can find the article here.

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• How to build a Singleton-like dependency injector replacement (Php)

  - by Erparom

  I know out there are a lot of excelent containers, even frameworks almost entirely DI based with good strong IoC classes. However, this doesn't help me to "define" a new pattern. (This is Php code but understandable to anyone) Supose we have: //Declares the singleton class bookSingleton { private $author; private static $bookInstance; private static $isLoaned = FALSE; //The private constructor private function __constructor() { $this->author = "Onecrappy Writer Ofcheap Novels"; } //Sets the global isLoaned state and also gets self instance public static function loanBook() { if (self::$isLoaned === FALSE) { //Book already taken, so return false return FALSE; } else { //Ok, not loaned, lets instantiate (if needed and loan) if (!isset(self::$bookInstance)) { self::$bookInstance = new BookSingleton(); } self::$isLoaned = TRUE; } } //Return loaned state to false, so another book reader can take the book public function returnBook() { $self::$isLoaned = FALSE; } public function getAuthor() { return $this->author; } } Then we get the singelton consumtion class: //Consumes the Singleton class BookBorrower() { private $borrowedBook; private $haveBookState; public function __construct() { this->haveBookState = FALSE; } //Use the singelton-pattern behavior public function borrowBook() { $this->borrowedBook = BookSingleton::loanBook(); //Check if was successfully borrowed if (!this->borrowedBook) { $this->haveBookState = FALSE; } else { $this->haveBookState = TRUE; } } public function returnBook() { $this->borrowedBook->returnBook(); $this->haveBookState = FALSE; } public function getBook() { if ($this->haveBookState) { return "The book is loaned, the author is" . $this->borrowedbook->getAuthor(); } else { return "I don't have the book, perhaps someone else took it"; } } } At last, we got a client, to test the behavior function __autoload($class) { require_once $class . '.php'; } function write ($whatever,$breaks) { for($break = 0;$break<$breaks;$break++) { $whatever .= "\n"; } echo nl2br($whatever); } write("Begin Singleton test", 2); $borrowerJuan = new BookBorrower(); $borrowerPedro = new BookBorrower(); write("Juan asks for the book", 1); $borrowerJuan->borrowBook(); write("Book Borrowed? ", 1); write($borrowerJuan->getAuthorAndTitle(),2); write("Pedro asks for the book", 1); $borrowerPedro->borrowBook(); write("Book Borrowed? ", 1); write($borrowerPedro->getAuthorAndTitle(),2); write("Juan returns the book", 1); $borrowerJuan->returnBook(); write("Returned Book Juan? ", 1); write($borrowerJuan->getAuthorAndTitle(),2); write("Pedro asks again for the book", 1); $borrowerPedro->borrowBook(); write("Book Borrowed? ", 1); write($borrowerPedro->getAuthorAndTitle(),2); This will end up in the expected behavior: Begin Singleton test Juan asks for the book Book Borrowed? The book is loaned, the author is = Onecrappy Writer Ofcheap Novels Pedro asks for the book Book Borrowed? I don't have the book, perhaps someone else took it Juan returns the book Returned Book Juan? I don't have the book, perhaps someone else took it Pedro asks again for the book Book Borrowed? The book is loaned, the author is = Onecrappy Writer Ofcheap Novels So I want to make a pattern based on the DI technique able to do exactly the same, but without singleton pattern. As far as I'm aware, I KNOW I must inject the book inside "borrowBook" function instead of taking a static instance: public function borrowBook(BookNonSingleton $book) { if (isset($this->borrowedBook) || $book->isLoaned()) { $this->haveBook = FALSE; return FALSE; } else { $this->borrowedBook = $book; $this->haveBook = TRUE; return TRUE; } } And at the client, just handle the book: $borrowerJuan = new BookBorrower(); $borrowerJuan-borrowBook(new NonSingletonBook()); Etc... and so far so good, BUT... Im taking the responsability of "single instance" to the borrower, instead of keeping that responsability inside the NonSingletonBook, that since it has not anymore a private constructor, can be instantiated as many times... making instances on each call. So, What does my NonSingletonBook class MUST be in order to never allow borrowers to have this same book twice? (aka) keep the single instance. Because the dependency injector part of the code (borrower) does not solve me this AT ALL. Is it needed the container with an "asShared" method builder with static behavior? No way to encapsulate this functionallity into the Book itself? "Hey Im a book and I shouldn't be instantiated more than once, I'm unique"

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• How to revoke gnupg public key without private key?

  - by danijelc

  Long story short I have an key generated with seahorse and mistakenly deleted it from my system. I do remember passphrase but I don't have this key anywhere on my system. Scanned trough Ask Ubuntu but couldn't find any aplicabile solution on similar issue. However public key is still updated on keyring servers and I would like to revoke it. Since I have no revocation certificate and I can't get hold of private key (only public key is available from keyservers which I imported to seahorse) I have no idea how to accomplish it. Spent some time searching for solution acros net, various manuals and so on, but so far no luck. gpg --list-secret-keys - returns no output at all. gpg --list-keys - returns public key info gpg --gen-revoke *user-id* - returns - gpg: secret key *user-id* not found: eof gpg (GnuPG) version 1.4.11. Anyone able to suggest a solution?

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• Fastest way to get up to speed on webapp development with ASP.NET?

  - by leeand00

  I'm trying to get better at C# ASP.NET 3.5 development (...no none of that MVC stuff :), and fast! My boss gave me a book to read on it from Wrox, but the thing reads like a history novel, telling you how things worked as far back as ASP.NET 1.0; The web application we are developing is completely in ASP.NET 3.5 so I don't need to read through any of the history (maybe I'm wrong about that...but I don't really have the time to read about that...) Do you have any suggestions for a faster (book, series of tutorials) to come up to speed on it? I'd like to learn about UI components, database access, etc... P.S. In a previous position I was an JSP/J2EE developer (and I used MVC all the time! :-D) P.S.S. I did take a course on it in 2008 at some point, but it seemed all very pointy and clickly. I wanna learn the code stuff! The how it works, and where the events are!

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• Web Service - SOAP

  - by seth

  My experience with web services is slim and I'm trying to understand this a little bit more. I have done for instance a web service using visual studio. In order to use it, I add a web service reference in my projects and this creates a proxy and the use is pretty simple. Does this use SOAP? I ask this because i will be now facing a web service that i must communicate using SOAP with attachements and i'm trying to understand the concept behind this and the difference to what i have done so far. Will the proxy still be viable or do i need to create the XML by hand and post it to the web service? This concepts still confuse and so any help is appreciated. EDIT: I'm not developing the service, i will be just using it.

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• F# open source project hosting using SVN

  - by Stephen Swensen

  Hi all, I'm looking to choose open source project hosting site for an F# project using SVN. CodePlex is where the .NET community in general and most F# projects are hosted, but I'm worried TFS + SvnBridge is going to give me headaches. So I'm looking elsewhere and seeking advice here. Or if you think CodePlex is still the best choice in my scenario, I'd like to hear that too. So far, Google Code is looking appealing to me. They have a clean interface and true SVN hosting. But there are close to no F# projects currently hosted (it's not even in their search by programming language list), so I'm wondering if there are any notable downsides besides the lack of community I might encounter. If there is yet another option, I'd like to hear that too. Thanks!

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• Versioning Strategy for Service Interfaces JAR

  - by Colin Morelli

  I'm building a service oriented architecture composed (mostly) of Java-based services, each of which is a Maven project (in an individual repository) with two submodules: common, and server. The common module contains the service's interfaces that clients can include in their project to make service calls. The server submodule contains the code that actually powers the service. I'm now trying to figure out an appropriate versioning strategy for the interfaces, such that each interface change results in a new common jar, but changes to the server (so long as they don't impact the contract of the interfaces) receive the same common jar. I know this is pretty simple to do manually (simply increment the server version and don't touch the common one), but this project will be built and deployed by a CI server, and I'd like to come up with a strategy for automatically versioning these. The only thing I have been able to come up with so far is to have the CI server md5 the service interfaces.

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• Using a :default for file names on include templates in SMARTY 3 [closed]

  - by Yohan Leafheart

  Hello everyone, Although I don't think the question was as good as it could be, let me try to explain better here. I have a site using SMARTY 3 as the template system. I have a template structure similar to the below one: /templates/place1/inner_a.tpl /templates/place1/inner_b.tpl /templates/place2/inner_b.tpl /templates/place2/inner_c.tpl /templates/default/inner_a.tpl /templates/default/inner_b.tpl /templates/default/inner_c.tpl These are getting included on the parent template using {include file="{$temp_folder}/{$inner_template}"} So far great. What I wanted to do is having a default for, in the case that the file "{$temp_folder}/{$inner_template}" does not exists, it uses the equivalent file at "default/{$inner_template}". i.e. If I do {include file="place1/inner_c.tpl"}, since that file does not exists it in fact includes "default/inner_c.tpl" Is it possible?

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• How to design a replay system

  - by daddz

  So how would I design a replay system? You may know it from certain games like Warcraft 3 or Starcraft where you can watch the game again after it has been played already. You end up with a relatively small replay file. So my questions are: How to save the data? (custom format?) (small filesize) What shall be saved? How to make it generic so it can be used in other games to record a time period (and not a complete match for example)? Make it possible to forward and rewind (WC3 couldn't rewind as far as I remember)

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• Literature for Inverse Kinematics: Joint Limits and beyond

  - by Jeff

  Recently I've been playing around with Inverse Kinematics and have been pretty impressed with the results. Naturally I want to take it further, but have no clue where to start. In particular, I would like to introduce joint limits (ie for a prismatic joint how far it can move, hinge joint what angles it has to be between, etc etc). Currently I understand how to produce the Jacobian matrix for the various joint types. I am particularly looking for literature (preferably free, and preferably easy to understand) on various ways to implement joint limits. Also I would like to find out different ideas on how inverse kinematics can be used.

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• error with slap.d while installing any new software

  - by ali haider

  I am trying to install wireshark (this issue is not specific to wireshark) on my ubuntu box and I keep getting the following error for slap.d: Setting up slapd (2.4.23-6ubuntu6.1) ... Creating initial configuration... mkdir: cannot create directory `/etc/ldap/slapd.d': File exists dpkg: error processing slapd (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: slapd Besides uninstalling or trying to update open LDAP or slap.d, is there any other action that can be taken to resolve this issue? I am trying the install as root user & I have tried moving the slap.d conf file so far but without any luck. Any thoughts on troubleshooting/resolving this issue will be quite welcome. thank in advance

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• Reviewing Orace ADF Enterprise Application Development Made Simple Book

  - by Grant Ronald

  Although I was a technical reviewer of Oracle ADF Enterprise Application Development-Made Simple (by Sten Vesterli) it is nice to get the finished article in your hands as a real tangible book. Personally, on a sun lounger with a Dan Brown book I can read 300 pages a day, but technical books are a different beast and I find it hard to get through them with the same vigour.  However, I'm up to chapter 7 in Sten's book and so far it's holding my interest.  He writes in an almost conversational tone and I really like the comparisons to "real world" concepts - like page templates being like gingerbread cookie cutters.  Personally I like to be able to compare or size up a new concept against something I already know. I'll post a full review next week but the good news is 212 pages in and I'm still reading!

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• Selenium server won't start

  - by moff

  I'm getting the following error when trying to start selenium: C:\Temp\selenium-server-1.0.3java -jar selenium-server.jar 22:02:07.615 INFO - Java: Sun Microsystems Inc. 16.0-b13 22:02:07.617 INFO - OS: Windows 7 6.1 x86 22:02:07.625 INFO - v2.0 [a2], with Core v2.0 [a2] 22:02:07.811 INFO - RemoteWebDriver instances should connect to: http://127.0.0. 1:4444/wd/hub 22:02:07.813 INFO - Version Jetty/5.1.x 22:02:07.815 INFO - Started HttpContext[/selenium-server/driver,/selenium-server /driver] 22:02:07.817 INFO - Started HttpContext[/selenium-server,/selenium-server] 22:02:07.818 INFO - Started HttpContext[/,/] 22:02:07.866 INFO - Started org.openqa.jetty.jetty.servlet.ServletHandler@2bbd86 22:02:07.867 INFO - Started HttpContext[/wd,/wd] 22:02:07.870 WARN - Failed to start: [email protected]:4444 Exception in thread "main" org.openqa.jetty.util.MultiException[java.net.SocketE xception: Unrecognized Windows Sockets error: 0: JVM_Bind] at org.openqa.jetty.http.HttpServer.doStart(HttpServer.java:686) at org.openqa.jetty.util.Container.start(Container.java:72) at org.openqa.selenium.server.SeleniumServer.start(SeleniumServer.java:3 96) at org.openqa.selenium.server.SeleniumServer.boot(SeleniumServer.java:23 4) at org.openqa.selenium.server.SeleniumServer.main(SeleniumServer.java:19 8) java.net.SocketException: Unrecognized Windows Sockets error: 0: JVM_Bind at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.PlainSocketImpl.bind(Unknown Source) at java.net.ServerSocket.bind(Unknown Source) at java.net.ServerSocket.(Unknown Source) at org.openqa.jetty.util.ThreadedServer.newServerSocket(ThreadedServer.j ava:391) at org.openqa.jetty.util.ThreadedServer.open(ThreadedServer.java:477) at org.openqa.jetty.util.ThreadedServer.start(ThreadedServer.java:503) at org.openqa.jetty.http.SocketListener.start(SocketListener.java:204) at org.openqa.jetty.http.HttpServer.doStart(HttpServer.java:716) at org.openqa.jetty.util.Container.start(Container.java:72) at org.openqa.selenium.server.SeleniumServer.start(SeleniumServer.java:3 96) at org.openqa.selenium.server.SeleniumServer.boot(SeleniumServer.java:23 4) at org.openqa.selenium.server.SeleniumServer.main(SeleniumServer.java:19 8) Java is installed: C:\Temp\selenium-server-1.0.3java -version java version "1.6.0_18" Java(TM) SE Runtime Environment (build 1.6.0_18-b07) Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode, sharing) Thanks in advance

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• 2.5D action RPG game

  - by Phorden

  I want to make a 2.5D action RPG game in the next say five years. I need to learn a language first and I have started with C#. I haven't gotten too far into learning it and I would like advice on the best way to approach making a game like this in the long run. Work with XNA studios or stop and learn C++ and UDK? Or maybe there is another good way to approach this. I want to learn programming, so just using a visual editor without learning to code is not the way I want to go. I also don't want to write my game engine from scratch. I'm all ears for advice.

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• creating a google wave clone using php/mysql/jquery

  - by jeansymolanza

  seasons greetings to all. i have a question that has been rather bugging me as of late. does anyone know how one can create a google wave clone using php/mysql/jquery as primary points of development. any ideas on how this might be possible and recommend any starting points? i have some time off work and it would be an interesting project to undertake as i want to use it in an e-learning framework next year. i will be testing the product on a XAMPP local server. i understand some of the technologies that google wave using but i am rather curious as to how these can be developed to a decent standard using php/mysql/jquery (i mention these three because i am quite adept at them). any links to resources best suited to an intermediate programmer would be appreciated. many thanks and God bless. so far i have this: http://konrness.com/javascript/google-wave-style-scroll-bar-jquery-plugin/

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• Setup site folders on Apache and PHP [closed]

  - by Cobus Kruger

  I'm trying to set up my first Apache server on my Windows PC at home and I have real trouble finding out which configuration settings go where. I downloaded and installed XAMPP which seemed to get everything nicely set up and can see a working website on http://localhost. So far so good. The point of this is to develop a website of course, and to make my life easier (irony?), I wanted to let the web site root point to my Eclipse project folder. So I opened httpd.conf, uncommented a VirtualHost block and changed its DocumentRoot to my local path. Now when I try to load http://localhost I get a 403 (Access denied) error. So where do I configure permissions for my folder? And is that all I need to let my site run from the folder specified or am I going to have to clear another hurdle?

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• A good interpreted language for a small embedded project

  - by Earlz

  I have an mbed which has a small ARM Cortex M3 on it. Basically, my effective resources for the project are ~25Kb of RAM and ~400Kb of Flash. For I/O I'll have a PS/2 keyboard, a VGA framebuffer(with character output), and an SD card for saving/loading programs(up to a couple of Mb maybe) The reason I ask this here is because I'm trying to figure out what programming language to implement on the thing. I'm looking for an interpreted language that's easy for me to implement, and won't break the bank on my resources. I also intend for this to be at least possible to write on th device itself, though the editor can be interpreted(yay bootstrapping) Anyway, I've looked at a few simple languages. Some nice candidates: Forth BASIC Scheme? Has anyone done something like this or know of any languages that can fit this bill or have comments about my three candidates so far?

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• For normal mapping, why can we not simply add the tangent normal to the surface normal?

  - by sebf

  I am looking at implementing bump mapping (which in all implementations I have seen is really normal mapping), and so far all I have read says that to do this, we create a matrix to convert from world-space to tangent-space, in order to transform the lights and eye direction vectors into tangent space, so that the vectors from the normal map may be used directly in place of those passed through from the vertex shader. What I do not understand though, is why we cannot just use the normalised sum of the sampled-normal vector, and the surface-normal? (assuming we already transform and pass through the surface normal for the existing lighting functions) Take the diagram below; the normal is simply the deviation from the 'reference normal' for any given coordinate system, correct? And transforming the surface normal of a mapped surface from world space to tangent space makes it equivalent to the tangent space 'reference normal', no? If so, why do we transform all lighting vectors into tangent space, instead of simply transforming the sampled tangent once in the pixel shader?

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• If you can only read one book this year: Professional C# 4 and .NET 4 from wrox is the one.

  I just read the Professional C# 4 and .NET 4 from wrox, wrote by Christian Nagel, Bill Evjen, Jay Glynn, Karli Watson and Morgan Skinner. This is a complete book in whats in .NET 4 as well as a great book for anybody jumping in .NET. They did a great job including all the important parts of .NET as well as the new version 4. As I was reading, my first impression was how far .NET has gone since version 1.0, the different platforms including WPF, Silverlight, ASP.NET ADO.NET, LINQ and PLINQ now...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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