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• Game Object Design

  - by oisin

  I'm having a problem with the way I designed my first simple game in C++. I have GameObject (abstract class) and ObjectA which inherits the update() and draw() methods from GameObject. My main loop contains a linked list of GameObject*, and while that list is not empty it cycles through it, calling update on each one. Up until this point, I thought the design was standard(?) and would work. However, when I call update on ObjectA() I run into two problems: ObjectA can die which messes up the list, which in turn throws off the loop in main. ObjectA can spawn more ObjectA's but these are local scope and the update() goes out of scope, creating problems in main's list of GameObjects. I think my design if alright, but I'm having such problems with segmentation faults that there must be something seriously wrong with at least one part of my implementation. If anyone could point out any serious mistakes or simple examples of this being done (or even alternative designs) then I would greatly appreciate it!

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• Samsung envisagerait d'abandonner les PCs, le constructeur Coréen dément : mais sans grande conviction ?

  Samsung envisagerait d'abandonner les PCs Le constructeur Coréen dément, sans grande conviction ?La nouvelle est partie du Korea Times. Un porte-parole du premier constructeur Coréen déclarait au quotidien national que Samsung allait « restructurer sa branche PC avec un recentrage de ces produits vers des références les plus profitables ».Et de citer, comme produits plus intéressants que les PC traditionnels, les tablettes et les portables hybrides. Voire les all-in-one tactiles.Le but de Samsung serait d'allouer ses ressources à sa nouvelle mission principale : doubler ses ventes de tablettes et dépasser ainsi les 16 % de part de marché dans un an. Et améliorer ainsi sa rentabilité.

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• Designing a hierarchical structure with lots of reads and writes?

  - by JD01

  I am in the process of working on a video on demand system part of it involves the management of a hierarchical tree structure (think windows explorer) which allows users to upload videos, move folders around, create new folders etc. User action will be allowed depending on which permissions they have. In addition to managing the structure (creating folders and uploading videos), subscribers will be viewing content (read access). The number of reads will be significantly more than the writes. My question (and it is big one) is should I store the data in a database (for the writes) and also have some sort of cache which will be used for the reads? or do I use two databases? or is there a better solution? Also I will have to resolve concurrency issues which I think optimistic locking on the database will resolve. I have a fair bit about CQRS over the last few months but not sure if this is the way to go. Any ideas?

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• Google s'exprime sur ses règles de confidentialité, dans une lettre ouverte en réponse aux recommand

  Mise à jour du 11.05.2010 par Katleen Google s'exprime sur ses règles de confidentialité, dans une lettre ouverte en réponse aux recommandations européennes Google vient enfin de répondre à la lettre salée qu'il avait reçue de la part de la CNIL et de neuf autres organisations européennes (voir news précédente ci-dessous), dans un courrier ouvert rendu public ce jour. La firme de Mountain View y expose sa vision de la collecte de données personnelles et rappelle ses règles de confidentialité maison. Google met en avant le fait que ses utilisateurs sont informés des données qu'il récolte et conserve, avant de déclarer utiliser ces informations pour «fournir des produits et services util...

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• Is there anyway i can create an intranet request form and have it be stored in a database? [on hold]

  - by eternalearth888

  I am trying to create a form for my companies intraNet site. The idea is as follows: An employee wants to make a purchase, so they will go to the appropriate page in the intraNet They will fill out the form on the intraNet page They click the email button The data in the form is saved in a database, and an email is sent to me stating that there is purchase order request form filled out I am not exactly sure how to go about this. Part of me wants to create it in a Data Access Page but I am not sure that's correct. If there is no one here who can help, is there anyone who can direct me to someone/something that can help me?

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• How do you deal with monotony of certain tasks? [on hold]

  - by aaronmallen

  I love programming methods, and functions. The if {}, while {}, etc... logic behind them is so much fun. I also love making commits, merging branches, solving merge conflicts. Unfortunately these activities usually require that I create classes which I find tedious and monotonous. The simple action of defining properties, is getting in the way of me writing the logic on what to do with those properties. I can't be alone here there has to be a part of coding for everyone that they dread or at least severely dislike doing compared to other parts of coding. How do you deal with the code based tasks that you find tedious?

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• How would I go about updating my electronic circuit simulator's 'electricity'?

  - by liqwidice

  I have made an application which allows the user to place down wires, power sources, and inverters on a virtual circuit board. All connections between tiles are automatic, as shown here: As you can see in the last image, the updating of power throughout this grid is not yet functioning. I think I understand how to do this updating conceptually, but getting it to work in my program is appearing to be much more difficult than I first imagined. My source code can be found here. If you have any tips as to how to I might approach this monstrous task, please let me know. EDIT The goal here is to simply get a working application. Getting tiles to pass on power to their neighbors is quite easy, but the tricky part is getting wires to "unpower" after the removal of a power source. The size of the grid is just 18x18, so efficiency really isn't a factor, for those wondering.

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• Pinging/connecting to server.domain.local never works, but server does when the search domain is specified

  - by SuperMatt

  This is a bit of a weird one. I'm running ubuntu on a Windows domain. If I type "ping server" I can ping correctly and I can connect without any problems. It looks up my search domain (domain.local) and everything is hunky dory. Problem is when I try to ping server.domain.local. It just can't look up the server and comes back with "ping: unknown host server.domain.local" Part of me thinks that the name servers aren't set correctly, but I wonder if there is something I can do to get around it.

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• SQL Saturday #320 - Raleigh, NC

  SQL Saturday is a training event for SQL Server professionals and those wanting to learn about SQL Server. The Triangle SQL Server user group (http://www.tripass.org) of Raleigh, NC is hosting this event on September 6, 2014. Register while space is available. Can 41,000 DBAs really be wrong? Join 41,000 other DBAs who are following the new series from the DBA Team: the 5 Worst Days in a DBA’s Life. Part 3, As Corrupt As It Gets, is out now – read it here.

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• Samsung envisagerait d'abandonner les PC, le constructeur Coréen dément : mais sans grande conviction ?

  Samsung envisagerait d'abandonner les PC Le constructeur Coréen dément, sans grande conviction ?La nouvelle est partie du Korea Times. Un porte-parole du premier constructeur Coréen déclarait au quotidien national que Samsung allait « restructurer sa branche PC avec un recentrage de ses produits vers des références les plus profitables ».Et de citer, comme produits plus intéressants que les PC traditionnels, les tablettes et les portables hybrides. Voire les all-in-one tactiles.Le but de Samsung serait d'allouer ses ressources à sa nouvelle mission principale : doubler ses ventes de tablettes et dépasser ainsi les 16 % de part de marché dans un an. Et améliorer ainsi sa rentabilité.

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• NetBeans 7.1 Release Candidate (RC) 1 is here

  - by alexismp

  NetBeans 7.1 RC 1 is here. Grab it from the usual place! As previously discussed, NetBeans 7.1 has full JavaFX 2.0 support but also a lot in store for Java EE and Web developers (CDI in particular is very neat). One of my personal favorite feature is that Deploy on Save is now set by default on Maven projects. Maybe one important part that didn't get proper coverage so far is CSS 3 support, an important feature which can be used from both Java EE and PHP but also from JavaFX. Java Downloads of NetBeans 7.1 start at 69 MB and a 166 MB download will get you everything you need to start coding right away with Java EE - a great tool and a fully integrated runtime (GlassFish 3.1.1). You really need to be not using Maven, not be interested in recent standards (Java EE 6, Java SE 7, Java FX 2.0, ...) and like to hand-craft assemble your IDE to afford ignoring NetBeans nowadays.

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• [Natty] Disable new invisible border feature? (ruins compiz grid)

  - by Ike

  a new "feature" was added recently that adds an invisible border around the windows to grab for resizing (although i thought the new resize grip solved any issues). this annoys me because it destroys the usefulness of the grid plugin of compiz.. i'm not sure if the border is part of compiz or gnome, but i'd like to know how to disable it. i couldn't find any options in ccsm or the window settings in gnome. see the screenshot to see how much waste is causes. these windows should match up instead of having blank space surrounding all of them.

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• Helloooooooooooo, is anybody here?

  - by The Official Microsoft IIS Site

  Well, to start off with, we got a great response to our PHP survey and …. But wait, first things first, let us start off with introductions. I joined the team recently as the Program Manager for this driver. I’ve worked on several technologies in my career and very excited to be a part of this great team and look forward to working with you all, the PHP developer community! PHP and its ecosystem is new to me, so I’ve been ramping up over the last few months as well as helping the team as best I can...(read more)

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• SEO Marketing - How to Promote Your Website and Gain More Traffic?

  Having problems in promoting your website? Do your risk everything to put your website on top with weak SEO marketing strategy? SEO Marketing is a very important part in promoting your website and to market your products. It will help you gain more traffic to your website and increase your page rank. However, it will be only a waste of money if your website has weak seo marketing strategy. Remember that people nowadays use the internet to gain any information in any website or probably your website.

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• Les netbooks connaissent une progression record de 71 % selon Gartner : qui a dit qu'ils étaient dép

  Mise à jour du 26/05/10 Les ventes de netbooks connaissent une progression record De + 71 % par rapport au premier trimestre 2009 : qui a dit que les PC low-costs étaient morts ? 2009 avait été une année noire mais tout de même. Selon le cabinet Gartner, les ventes de PC portables auraient progressé de plus de 40 % au premier trimestre 2010 par rapport au premier trimestre 2009 (+ 43,4 %). Le cabinet précise qu'il s'agit de la plus forte progression enregistrée depuis 8 ans. Plus impressionnant encore « les netbooks ont participé pour une part importante à la croissance, leurs ventes ont progressé de 71% par rapport à la mêm...

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• Cannot import the following keyfile: blah.pfx. The keyfile may be password protected.

  - by JasonD

  We just upgraded our Visual Studio 2008 projects to VS2010. All of our assemblies were strong signed using a Verisign code signing certificate. Since the upgrade we continuously get the following error: Cannot import the following key file: companyname.pfx. The key file may be password protected. To correct this, try to import the certificate again or manually install the certificate to the Strong Name CSP with the following key container name: VS_KEY_3E185446540E7F7A This happens on some developer machines and not others. Some methods used to fix this that worked some of the time include: re-installing the key file from Windows Explorer (right click on the PFX file and click Install) installing VS2010 on a fresh machine for the first time prompts you for the password the first time you open the project, and then it works. On machines upgraded from VS2008, you don't get this option. I've tried using the SN.EXE utility to register the key with the Strong Name CSP as the error message suggests, but whenever I run the tool with any options using the version that came with VS2010, SN.EXE just lists its command line arguments instead of doing anything. This happens regardless of what arguments I supply. Does anyone know WHY this is happening, and have clear steps to fix it? I'm about to give up on Click Once installs and Microsoft Code Signing. Thanks for any help!

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• faster implementation of sum ( for Codility test )

  - by Oscar Reyes

  How can the following simple implementation of sum be faster? private long sum( int [] a, int begin, int end ) { if( a == null ) { return 0; } long r = 0; for( int i = begin ; i < end ; i++ ) { r+= a[i]; } return r; } EDIT Background is in order. Reading latest entry on coding horror, I came to this site: http://codility.com which has this interesting programming test. Anyway, I got 60 out of 100 in my submission, and basically ( I think ) is because this implementation of sum, because those parts where I failed are the performance parts. I'm getting TIME_OUT_ERROR's So, I was wondering if an optimization in the algorithm is possible. So, no built in functions or assembly would be allowed. This my be done in C, C++, C#, Java or pretty much in any other. EDIT As usual, mmyers was right. I did profile the code and I saw most of the time was spent on that function, but I didn't understand why. So what I did was to throw away my implementation and start with a new one. This time I've got an optimal solution [ according to San Jacinto O(n) -see comments to MSN below - ] This time I've got 81% on Codility which I think is good enough. The problem is that I didn't take the 30 mins. but around 2 hrs. but I guess that leaves me still as a good programmer, for I could work on the problem until I found an optimal solution: Here's my result. I never understood what is those "combinations of..." nor how to test "extreme_first"

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• winforms databinding best practices

  - by Kaiser Soze

  Demands / problems: I would like to bind multiple properties of an entity to controls in a form. Some of which are read only from time to time (according to business logic). When using an entity that implements INotifyPropertyChanged as the DataSource, every change notification refreshes all the controls bound to that data source (easy to verify - just bind two properties to two controls and invoke a change notification on one of them, you will see that both properties are hit and reevaluated). There should be user friendly error notifications (the entity implements IDataErrorInfo). (probably using ErrorProvider) Using the entity as the DataSource of the controls leads to performance issues and makes life harder when its time for a control to be read only. I thought of creating some kind of wrapper that holds the entity and a specific property so that each control would be bound to a different DataSource. Moreover, that wrapper could hold the ReadOnly indicator for that property so the control would be bound directly to that value. The wrapper could look like this: interface IPropertyWrapper : INotifyPropertyChanged, IDataErrorInfo { object Value { get; set; } bool IsReadOnly { get; } } But this means also a different ErrorProvider for each property (property wrapper) I feel like I'm trying to reinvent the wheel... What is the 'proper' way of handling complex binding demands like these? Thanks ahead.

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• Obtaining MFC Feature Pack GUI elements in .NET WinForms

  - by Cody Gray

  The MFC Feature Pack (and VS 2010) adds out-of-the-box support for several "modern" GUI elements (such as MDI with tabbed documents, the ribbon, and a Visual Studio-style interface with docking panels). These are a boon to those of us that have to support legacy MFC-based applications and want to update their look-and-feel, and a sign that Microsoft has not completely abandoned unmanaged C++ development. However, with the push so strongly in favor of .NET, WinForms, and managed code (and for plenty of good reasons), there seems little reason to develop new applications in unmanaged C++/MFC. The question then becomes how does one obtain these GUI elements in a WinForms application. Almost all of the add-ons and libraries I have found so far cost money, and introduce additional dependencies. I don't have a budget to buy third-party libraries, and the controls provided by Microsoft in MFC for free seem sufficient for our needs. But I still have reservations about learning MFC to develop a new application. Not only does the investment in time seem significant (by all accounts, MFC seems particularly difficult to learn, even for experienced .NET developers--although I am willing to try), but the question of MFC's lifespan is raised as well. Certainly, given the millions of lines of code and existing apps written in native C++, it will be around for some time, but the handwriting seems to be on the wall, so to speak, that it's no longer Microsoft's touted development platform. It seems like these features should be available by now in WinForms without the need for third-party add-ons, or devoting a lot of time and resources to custom-drawing EVERYTHING. Am I just missing something? I find very little online that compares these new features of MFC to what is available in WinForms, mainly because most everything written on MFC pre-dated its most recent update, before which it looked admitted "dated," and with its other flaws, was hardly an appealing platform for new development. With the very recent release of VS 2010, we have a while to wait before WinForms gets updated again. What routes are you guys taking for applications whose customers demand a modern-looking UI on a budget?

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• How to distribute ranking using MySQL Query and PHP

  - by nkp

  I have to distribute ranking to the 5000 students in an exam. Ranking is based on the score and the time taken (in seconds) to obtain that score. For example is 5 students have same score, then taken will be the criteria to calculate their ranks otherwise score should be the criteria to calculate their ranks. Following is my table tbRank ID StudID Score Time Date Rank 1 11 8 60 09-11-2013 2 22 6 45 09-11-2013 3 33 4 76 09-11-2013 4 44 6 67 09-11-2013 5 55 8 35 09-11-2013 6 66 8 35 08-11-2013 7 77 8 39 08-11-2013 Now rank column in above table should be updated as: ID StudID Score Time Date Rank 1 11 8 60 09-11-2013 2 2 22 6 45 09-11-2013 3 3 33 4 76 09-11-2013 5 4 44 6 67 09-11-2013 4 5 55 8 35 09-11-2013 1 6 66 8 35 08-11-2013 1 7 77 8 39 08-11-2013 2 I want to make a MySQL Query to do this business. Similarly there can be more than 10000 records in the table. So I need an optimized query for this functionality. Note: I am using PHP and MYSQL. Update: Everyday almost 5000 new entries will be created in the table and after all insertions are made, rank column will be updated once in a day. Now please suggest me the best way to do this. If I update rank column in the table, then only once I will have to do it, otherwise everytime while fetching the rank of the student, I will have to make calculations.

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• Using Unit of Work design pattern / NHibernate Sessions in an MVVM WPF

  - by Echiban

  I think I am stuck in the paralysis of analysis. Please help! I currently have a project that Uses NHibernate on SQLite Implements Repository and Unit of Work pattern: http://blogs.hibernatingrhinos.com/nhibernate/archive/2008/04/10/nhibernate-and-the-unit-of-work-pattern.aspx MVVM strategy in a WPF app Unit of Work implementation in my case supports one NHibernate session at a time. I thought at the time that this makes sense; it hides inner workings of NHibernate session from ViewModel. Now, according to Oren Eini (Ayende): http://msdn.microsoft.com/en-us/magazine/ee819139.aspx He convinces the audience that NHibernate sessions should be created / disposed when the view associated with the presenter / viewmodel is disposed. He presents issues why you don't want one session per windows app, nor do you want a session to be created / disposed per transaction. This unfortunately poses a problem because my UI can easily have 10+ view/viewmodels present in an app. He is presenting using a MVP strategy, but does his advice translate to MVVM? Does this mean that I should scrap the unit of work and have viewmodel create NHibernate sessions directly? Should a WPF app only have one working session at a time? If that is true, when should I create / dispose a NHibernate session? And I still haven't considered how NHibernate Stateless sessions fit into all this! My brain is going to explode. Please help!

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• Algorithm design, "randomising" timetable schedule in Python although open to other languages.

  - by S1syphus

  Before I start I should add I am a musician and not a native programmer, this was undertook to make my life easier. Here is the situation, at work I'm given a new csv file each which contains a list of sound files, their length, and the minimum total amount of time they must be played. I create a playlist of exactly 60 minutes, from this excel file. Each sample played the by the minimum number of instances, but spread out from each other; so there will never be a period where for where one sound is played twice in a row or in close proximity to itself. Secondly, if the minimum instances of each song has been used, and there is still time with in the 60 min, it needs to fill the remaining time using sounds till 60 minutes is reached, while adhering to above. The smallest duration possible is 15 seconds, and then multiples of 15 seconds. Here is what I came up with in python and the problems I'm having with it, and as one user said its buggy due to the random library used in it. So I'm guessing a total rethink is on the table, here is where I need your help. Whats is the best way to solve the issue, I have had a brief look at things like knapsack and bin packing algorithms, while both are relevant neither are appropriate and maybe a bit beyond me.

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• Visual Studio 2010 Crashes when Creating or Editing a Report (.rdlc) with the Report Designer

  - by ondesertverge

  This is an issue I had with VS 2010 RC and was hoping would be solved with the first official release. Sadly it wasn't. What I have is a number of reports originally created with VS 2008. When opening any of these for editing in VS 2010's Report Designer VS hangs for about two minutes and then shuts down. Same happens when creating a new report using the wizard. Only difference is that a dialog opens up showing a "Loading ..." message then hangs for about the same amount of time and crashes. Running devenv /log gives nothing of value. The Windows Application Event Viewer shows only this: Faulting application name: devenv.exe, version: 10.0.30319.1, time stamp: 0x4ba1fab3 Faulting module name: clr.dll, version: 4.0.30319.1, time stamp: 0x4ba1d9ef Exception code: 0xc00000fd Fault offset: 0x00001919 Faulting process id: 0xc38 Faulting And this: .NET Runtime version 2.0.50727.4927 - Fatal Execution Engine Error (6F551CF2) (0) Has anyone else experienced this and found a solution? OR -- Is there a better tool for rapidly creating decent reports within a WinForms app? Help would be greatly appreciated!

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• WiX/Windows Installer: Re-install to a new folder

  - by vitalyval

  1. I am using WiX for creating installer and would like to implement the following behaviour: If a user launches msi installer for the product and the product already installed, then wizard works similar to pure (first time) installation with exception of some things (e.g. license aggrement screen is omitted). The wizard should allow for example to change installation folder, select whether to place desktop shortcut,... I tried to do: <Publish Event="ReinstallMode" Value="amus"><![CDATA[INSTALL_MODE = "Change"]]></Publish> <Publish Event="Reinstall" Value="ALL"><![CDATA[INSTALL_MODE = "Change"]]></Publish> But after installation completes: the product is in the same folder, where it was installed first time; desktop icon in the same state as it was after first time install. MSDN says: "Do not attempt to change the target directory path if some components that use the path are already installed for the current user or for a different user". Is there a way to re-install in another forlder and add/remove desktop icon in re-install? 2. Is this normal to use the same KeyPath for some components? For example the same registry values for DeskTop and Programs menu shortcuts? MSDN says: "Two components cannot share the same key path value". But compiling and verifying goes OK. And I did not discover problems using the same keypaths.

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• Drawing custom graphics on the iPhone: CALayer vs. CGContext

  - by Henry Cooke

  Hi all, I have an application in which I'm doing some custom drawing, a bunch of lines on a gradient background, like so (ignore the text, they're just UILabels): At the moment, that's all done by starting a new CGContext, drawing stuff into it with CGContextDrawLinearGradient and CGContextStrokePath, then finally saving the resulting image with UIGraphicsGetImageFromCurrentImageContext. The positioning info is calculated while I'm laying out those labels, so it'd be a PITA (and duplication of effort) to calculate it all over again when the containing UIView is drawn with drawRect, so I'm drawing it ahead of time into a UIImage. All works fine, so far so good. However, I have a sneaking suspicion that it may be more efficient to use CALayers to do this drawing. My (cursory) understanding of the difference between the two approaches is that a CALayer is more like a bunch of instructions to draw stuff, and so takes up less memory until it's actually drawn onscreen, whereas drawing everything into a UIImage ahead of time means that you've got a sodding great bitmap kicking around in memory all the time, whether it's drawn or not. Is that a correct understanding? What is generally considered to be the best way of drawing custom images on the iPhone?

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