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  • What is the difference between all-static-methods and applying a singleton pattern?

    - by shahensha
    I am making a database to store information about the users of my website (I am using stuts2 and hence Java EE technology). For the database I'll be making a DBManager. Should I apply singleton pattern here or rather make all it's methods static? I will be using this DBManager for basic things like adding, deleting and updating User profiles. Along with it, I'll use for all other querying purposes, for instance to find out whether a username already exists and to get all users for administrative purposes and stuff like that. My questions What is the benefit of singleton pattern? Which thing is most apt here? All static methods or a singleton pattern? Please compare both of them. P.S. The database is bigger than this. Here I am talking only about the tables which I'll be using for storing User Information.

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  • How to organize functional programs

    - by bleakcabal
    In OOP, your basic unit of organization for code is the class. A frequently used methodology in Java, C# and similar languages is to organize your code around having one file for each class with the file name following the class name. You can consider each of these class as a unit of organization to group a single concept. These classes are in in namespaces which often follow the directory structure of the files in the solution/project. Namespaces are another level of organization. How are large projects in functional languages typically organized? How to you determine how to split your functions into different files? Are other units of grouping beside files used? How is code typically organized within a single file?

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  • When dealing with a static game board, what are some methods to make it more interesting?

    - by Ólafur Waage
    Let's say you have a game board that you look at. It does not move but there is some action going on. For example Chess, Checkers, Solitaire. The game I'm working on is not one of these but it's a good reference. What are some methods you can apply to the game or the design that increases the appeal of the game to the user? Of course you can make it prettier but what are some other methods you can use? For example: Visual cues, game design changes, user interface arrangement, etc.

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  • c# multi - point selection on an image

    - by sinem
    I'm designing interface with visual c# for my image processing project. i'm not good at c# codding. and i haven't enough time. I need point selection on an image and classification these points for using in my image processing code at vhdl. Orginal image will stay at a picturebox and i will use selected image in another picturebox. How i can select points on an image ? please could you help me or send me similar code? I'm getting so confused thank you.

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  • VS2010 tip: Cannot find the HttpUtility on .NET 4.0?

    Now that Visual Studio 2010 is here with more options and better colors, there are a few things that have changed a little and might confused you a bit. For example the good HttpUtility, if you are creating a Windows Console application or a Windows Service and you want to use that awesome class full of goodies, you would try to go to reference and add System.Web.dll, yet in the list that dll will be missing. So did they removed that dll in .NET 4? Not really, still there however there are not profiles...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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  • AutoVue for Agile Sessions at the Oracle Value Chain Summit 2013

    - by Pam Petropoulos
    At the upcoming Oracle Value Chain Summit, which takes place February 4 - 6, 2013 in San Francisco, CA, AutoVue Enterprise Visualization solutions will be covered in a variety of sessions within the Agile PLM solution area. Attend the following sessions during the Product Deep Dives & Demos Track, and discover the latest AutoVue for Agile capabilities, including how to streamline business processes, such as change management by creating ECRs directly from within CAD designs. Visual Decision Making to Optimize New Product Development and Introduction Date: Tuesday, February 5 Time: 12:45 pm to 1:30 pm Seeing the Forest: Next Generation Visualization Date: Wednesday, February 6 Time: 3:15 pm to 4:00 pm Next-Generation CAD Data Management: MCAD, ECAD, and Software Configuration Management Date: Wednesday, February 6 Time: 11:15 am to 12:00 pm Keep an eye on this blog for forthcoming details about each of these sessions. Don’t miss this opportunity to mingle with other AutoVue for Agile customers and meet one on one with the AutoVue product management and development team. Register now for the early bird rate of $195 and secure your spot at the Summit. Click here to register and learn more.

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  • APress Deal of the Day 15/Jan/2011 - Windows Mobile Game Development: Building games for the Windows Phone and other mobile devices

    - by TATWORTH
    Todays Apress $10 deal of the the day is: Windows Mobile Game Development: Building games for the Windows Phone and other mobile devices This book will provide you with a comprehensive guide to developing games for both the Windows Mobile platform and the Windows Phone using the industry standard programming languages C# and VB.NET. $49.99 | Published Apr 2010 | The book dates from the VS2005/VS2008 era but should still be useful to VS2010 developers. Given that such games development can now be done within Visual Studio. Whilst these devices use the Compact Framework instead of the standard Dot Net Framework, it is still a familiar envirnment. This book should be of benefit not just to games developers but to anyone with an interest in development for mobile phones.

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  • Linux OpenGL programming, should I use GLX or any other?

    - by pahnin
    I'm new to OpenGL and found that there are a lot of libraries to do that in C, and I also found that glx is most friendly with Linux X Server, I just want to do basic stuff, and I cannot find any tutorials for GLX. Is GLX a bad thing? I just want to do some small graphical things without installing many libraries and getting confused. Can anyone suggest me something which has tutorials and simple to compile? I found a link with an example with GLX and it worked perfect with no errors: anyone please suggest where I can find nice documentation or any better libraries.

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  • How to include content from remote server while keeping that content secure

    - by slayton
    I am hosting collection of videos, for which I retain the copyright, on a file server that I'd like to share with family and friends. When a user visits the my fileserver via a web browser they are asked to authenticate using HTTP auth and then they are presented with a basic list of the files. I'd like to build web application that provides a clean interface with simply library functionality. However, this app will be hosted on a different server. I'm trying to figure out a security model for my file server that doesn't require the user to login to both the file-server and the hosting-server. I want to make this as easy as possible for my non-tech savy family while still maintaining security for my files.

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  • How to make the apt autocompletion work in minimal system (in LXC container)?

    - by Adam Ryczkowski
    When I work inside thin LXC container on 12.04 I have only very basic system. In particular the /etc/bash_completion.d is missing the e.g. apt, that I find particularly useful. Is there any standard package, that installs the autocompletion for the apt, or should I copy the file manually? And just copying the files into /etc/bash_completion.d manually just doesn't seem to work. I use bash as my command interpreter. What am I missing here?

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  • APress Deal of the Day - 19/Nov/2011 - Beginning GIMP

    - by TATWORTH
    Today's$10 Deal of the Day from APress at http://www.apress.com/9781430210702 is "Beginning GIMP". "In this fully-updated second edition, author and long-time member of the GIMP community Akkana Peck introduces the GIMP and shows you everything about it that you'll want to know—including how to prepare images for display on web pages, touch up digital photos, tap into powerful filters, effects, and plug-ins, and automate tasks using scripts." For those of you unfamilar with GIMP it is the GNU Image Manipulation Program and it is available for free from http://www.gimp.org/downloads/   Can't code withoutThe best C# & VB.NET refactoring plugin for Visual Studio

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  • Game Development In C Only. Is it possible?

    - by Ishan Sharma
    I am a first year college student in India and want to make a small game as a this semester project. I am quite good at C and am learning it rapidly but I wanted to ask if developing a game entirely in C (no C++ or C#) I'd love to use these but for college projects, we have strict requirements of using only C. What I am looking for is a simple top view driving game. It won't have anything fancy and even the visual things will be powered by simple characters. For example, user controlled car can be represented by ¦ and edges of road by series of |'s. What do you think?

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  • ideas on multiplayer games which include lots of collaboration?

    - by user494461
    For my master thesis I wanted to design a small multiplayer game which includes more than one player(maybe 5), has 2-3 players collaborating at a time to achieve some task. The most important thing is realistic simulation of the movable objects in the scene which more than one player should simultaneously interact with. I would also prefer large virtual environments (VEs) like mmogs where groups of players are interacting in different areas of the VE. tasks for players should include 2-3 players touching movable objects at same time. e,g, a very basic task can be users lifting a cube together and pushing it through a hole I am not new to designing virtual environments with openGL, but have never designed games before and rarely play other than few of my favorite ones like Fifa. I wanted some ideas on what kind of games should I look at which should help me with ideas for my tasks for the users to gain points and win in games? any current indie games which might inspire me?

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  • Book suggestions for GUI related topics [closed]

    - by asrijaal
    In the past, I've developed more on the server side, so no big GUI/graphic programming topics have crossed my way so far. I'm switching a little bit to the mobile plattforms (iOS, android) and would like to gather more info on the visual/graphic side. Using the SDK controls/widgets isn't that challenging and I would love to get deeper into the view/presentation layer. Animations, drawing itself, probably OpenGL. Any books that would take me a little deeper in understanding how drawing actually works would be helpful.

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  • C# on ubuntu 12.04

    - by Deus Deceit
    Is C# a good choice for ubuntu programming? E.g unity, or applications that will run on ubuntu? Am I doing good wanting to learn C# when I'm determined to stick with ubuntu and develop on it or for it? If not, can you give me reasons why? And which languages would be better than c# for ubuntu development? I already know c, c++, java(basics), php, mysql, python(basics). I like to learn new stuff, but stuff that worth my time. Does C# worth my time? If c# worth my time, here's what I have done and what I need: I installed all mono packages I could find on the ubuntu standard repositories. Now I want a good tutorial to get me started. I'm a complete noob with c# so a basic tutorial and how to compile run under ubuntu 12.04 would be great.

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  • What are some tasks you might ask a potential ruby developer hire to complete?

    - by opensourcechris
    I would like to start a career path as a developer. As my first Language I chose Ruby to learn. What are some types of coding I might be asked to do as part of an evaluation at a potential employer? For example on my interview... Employer: "So, you think you can be a programer!" Me: "Why yes sir, I believe I would be a fitting addition to your team" Employer: "Well that remains to be seen! To demonstrate your basic knowledge please code insert evaluation project here What would you have me do to demonstrate my skills?

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  • DevWeek 2010 is Coming Up

    The time has come again for the UK’s biggest conference for .NET developers and SQL Server professionals. The 13th annual DevWeek conference takes place on 15-19 March 2010 in London. Expert speakers will cover a large range topics, including .NET 4.0, Silverlight 3, WCF 4, Visual Studio 2010, Thread Synchronization, ASP.NET 4.0, SQL Server 2008 R2, Unit Testing, CLR & C# 4.0, Windows Azure, and T-SQL Tips & Tricks. Find out more. span.fullpost {display:none;}

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  • How long did you stay in your first programming job?

    - by Anon
    I've been in my first programming job for just under 2 years now (it will be two years next month). I went from Junior Developer initially to just Developer after about a year (when the senior developer left). It's a small company and I write all the code. I have been offered a cool new job (Windows 8, Visual Studio 2012, SQL Server 2012, MVC etc etc) and I am considering it not because I hate my current job (I don't, it's fun) but because I am scared that if I stay in the one job for too long, other employers won't want to hire me as it will look like I can't get a job anywhere else. It would help a lot if you could answer this question: How long did you stay in your first programming job? Thanks

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  • Answers to Conference Revenue Tweet Questions

    - by D'Arcy Lussier
    Originally posted on: http://geekswithblogs.net/dlussier/archive/2014/05/27/156612.aspxI tweeted this the other day… …and I had some people tweet back questioning/asking about the profit number. So here’s how I came to that figure. Total Revenue Let’s talk total revenue first. This conference has a huge list of companies/organizations paying some amount for sponsorship. Platinum ($1500) x 5 = $7500 Gold ($1000) x 3 = $3000 Silver ($500) x 9 = $4500 Bronze ($250) x 13 = $3250 There’s also a title sponsor level but there’s no mention of how much that is…more than $1500 though, so let’s just say $2500. Total Sponsorship Revenue: $20750.00 For registrations, this conference is claiming over 300 attendees. We’ll just calculate at 300 and the discounted “member rate” – $249. Total Registration Revenue: $74700.00 Booth space is also sold for a vendor area, but let’s just leave that out of the calculation. Total Event Revenue: $95450.00 Now that we know how much money we’re playing with, let’s knock out the costs for the event. Total Costs Hard Costs Audio/Visual Services $2000 Conference Rooms (4 Breakouts + Plenary) $2500 Insurance $700 Printing/Signage $1500 Travel/Hotel Rooms $2000 Keynotes $2000 So let’s talk about these hard costs first. First you may be asking about the Audio Visual. Yes those services can be that high, actually higher. But since there’s an A/V company touted as the official A/V provider, I gotta think there’s some discount for being branded as such. Conference rooms are actually an inflated amount of $500 per. Venues make money on the food they sell at events, not on room rentals. The more food, the cheaper the rooms tend to be offered at. Still, for the sake of argument, let’s set the rooms at $500 each knowing that they could be lower. For travel and hotel rooms…it appears that most of the speakers at this conference are local, meaning there’s no travel or hotel cost. But a few of them I wasn’t too sure…so let’s factor in enough to cover two outside speakers (airfare and hotel). There are two keynotes for this event and depending on the event those may be paid gigs. I’m not sure if they are or not, but considering the closing one is a comedian I’m going to add some funds here for that just in case. Total Hard Costs: $10700 Now that the hard costs are out of the way, let’s talk about the food costs. Food Costs The conference is providing a continental breakfast (YEEEESH!), some level of luncheon, and I have to assume coffee breaks in between. Let’s look at those costs. Continental Breakfast $12 per person Lunch Buffet $18 per person Coffee Breaks (2) $6 per person (or $3 a cup) Snacks (2) $10 per person (or $5 each) Note that the lunch buffet assumes a *good* lunch buffet – two entrees, starch, vegetable, salads, and bread. Not sure if there’ll be snacks during coffee breaks but let’s assume so. Total Food Cost Per Person: $46 Food Cost: $14950 Gratuity: $2691 Total Food Cost: $17641 Total food cost is based on the $46 per person cost x 325. 300 for attendance, 12 for speakers, extra 13 for volunteers/organizers. Gratuity is 18%. Grand Totals So let’s sum things up here. Total Costs Hard Costs: $10700.00 Food Costs: $17641.00 Total:          $28341.00 Taxes:         $3685.00 Grand Total  $32026.00 Total Revenue Sponsorship  $20750 Registration   $74700 Grand Total   $95450.00 Total Profit $63424.00 Now what if the registration numbers were lower and they only got 100 people to show up. In that scenario there’d still be a profit of just under $26000. Closing Comments A couple of things to note: - I haven’t factored in anything for prizes. Not sure if any will be given out - We didn’t add in the booth space revenue - We’re assuming speakers aren’t getting paid, but even if they were at the high end its $12000 ($1000 per session), which is probably an inflated number for local speakers. - Note that all registrations were set to the “member” discounted price. The non-member registration price is higher. There is also an option for those that just want to show up for the opening keynote. There you have it! Let me know if you have any questions. D

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  • Cannot start service SPUserCodeV4 on computer

    - by ybbest
    When you create a sand boxed solution for SharePoint 2010 in Visual Studio 2010 and try to deploy the solution , you could get the error “Error occurred in deployment step ‘Retract Solution’: Cannot start service SPUserCodeV4 on computer”(See the Picture1 below). In order to fix this , you need to go to Central Administration -> System Settings -> Manage services on server and start service “Microsoft SharePoint Foundation User Code Service” If you are developing SharePoint on DC(Domain controller),you need to check the solution from my previous post. Error message.(Picture1) Locate Microsoft SharePoint Foundation User Code Service.(Picture 2)

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  • MSDN Subscription

    - by Dave Yasko
    My work just started (a couple of months ago actually) allowing us access to our MSDN subscriptions.  This is totally cool.  I’ve been begging, borrowing, and stealing all these years to have access to Visual Studio and the other tools.  Now, I’ve got them all.  It is totally cool.  What’s even cooler is that I’m going to be installing them (along with a brandy spanky new Windows 7 installation) on a MacBook or MacBookPro in the coming weeks.  How’s that for most excellent?

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  • Ubuntu perfomance issues

    - by Pelda
    I have as deafult Win 7 64b. But i get annoyed by some windows stuff so I decided to install ubuntu and learn Linux, because Win 8 is a nightmare. I have my Ubuntu 12.04 64bit installed in 100gb partition of my 1 Tb disc. My problem is that my Ubuntu feel really slower than Win 7 - even though my Win 7 are after some years of usage and they became much slower. And Ubuntu is just installed OS - I just downloaded wine and skype. It takes some time for new window to appear (its not 10 seconds, but its really slower than my windows). Sometimes my donwload get stuck (in basic ubuntu app store) Its just weird to me. I thought its because of some drivers, but I am really new to linux, so I decided to ask some1 before I screw whole system up. Specs: -6gbs of RAM - 3x2gb -3.0 ghz CPU quadcore -graphic card is HD4870 sapphire Please excuse my poor english and my addiction to windows interface. Pelda

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  • Programming Interview : How to debug a program?

    - by Jake
    I was recently asked the following question in an interview : How do you debug a C++ program ? I started by explaining that programs may have syntax and semantic errors. Compiler reports the syntax errors which can be corrected. For semantic errors, various debuggers are available. I specifically talked about gdb, which is command line, and Visual Studio IDE's debugger, which has a GUI, and common commands. I also talked about debug and release version of code, how assertions should be used for debug build, how exceptions helps in automatic cleanup & putting the program in valid state, and how logging can be useful (e.g. using std::clog). I want to know if this answer is complete or not. Also, I want to hear how other people will go about answering this question in a structured manner ? Thanks.

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  • Distributing a very simple application

    - by vanna
    I have a very simple working console application written in C++ linked with a light static library. It is just for testing purposes. Now that the coding part is done, I would like to know the process of actually distributing the program. I wrote a very basic CMakeLists.txt that create makefiles or VS projects to build the sources. I also have a program that calls the static library in order to make some google tests. To me, the distribution of this application goes like this : to developpers : the src directory with the CMakeLists.txt file (multi-platform distribution) with a README.txt and an INSTALL.txt to users : the executable and a README.txt on my git repo : everything mentionned above plus the sources for testing and the gtest external lib A this point : considering the complexity of my application, am I doing it right ? Is there any reference that would formalize this distribution process so I can get better and go further ? Say I would like to add dynamic libraries that can be updated, external libraries like boost : how should I package this to distribute it in a professionnal way ?

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  • Several classes need to access the same data, where should the data be declared?

    - by Juicy
    I have a basic 2D tower defense game in C++. Each map is a separate class which inherits from GameState. The map delegates the logic and drawing code to each object in the game and sets data such as the map path. In pseudo-code the logic section might look something like this: update(): for each creep in creeps: creep.update() for each tower in towers: tower.update() for each missile in missiles: missile.update() The objects (creeps, towers and missiles) are stored in vector-of-pointers. The towers must have access to the vector-of-creeps and the vector-of-missiles to create new missiles and identify targets. The question is: where do I declare the vectors? Should they be members of the Map class, and passed as arguments to the tower.update() function? Or declared globally? Or are there other solutions I'm missing entirely?

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