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• xrander problem with 1900x1080p

  - by Eslam

  i have a problem with xrandr i successfully executed the following : #cvt 1900 1080 #xrandr 1900x1080 170.75 1904 2024 2224 2544 1080 1083 1093 1120 -hsync +vsync but unfortunately the following command : #xrandr --addmode VGA-0 1900x1080 returned the following error : X Error of failed request: BadMatch (invalid parameter attributes) Major opcode of failed request: 153 (RANDR) Minor opcode of failed request: 18 (RRAddOutputMode) Serial number of failed request: 29 Current serial number in output stream: 30 the following command output might help in identifying problem : #glxinfo |grep -i opengl OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce 310M/PCIe/SSE2 OpenGL version string: 3.3.0 NVIDIA 310.14 OpenGL shading language version string: 3.30 NVIDIA via Cg compiler OpenGL extensions: #lspci |grep -i vga 01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 310M] (rev a2) any ideas what's gonna be wrong ?

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• RESTful API design - should a PUT return related data?

  - by alexmcroberts

  I have an API which allows a user to update their system status; and a separate call to retrieve system status updates from other users. Would it make sense to unify them under a PUT request where a user would request a PUT update with their own status update, and they would receive the status updates of other users? My solution would allow the PUT request to call the GET request method internally. The reason behind this is that when a user updates their system status they should be informed of other users status immediately, and I don't feel that having 2 seperate requests is necessary - and should be optional. I intend to keep the GET request for other users status as a status update for a user is not necessarily required in order to retrieve other users status', but once they update their own status is it vital that they get information about other users.

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• JavaFX 2.2.3 Documentation

  - by joni g.

  JavaFX 2.2.3 and JDK 7u9 were released today. In addition to the release documentation, the following new information is provided: Learn about some of the "behind the scenes" work for an application, such as threads, events, and binding with the new learning trail on the landing page. Learn how to use cell editors with the List View component. The new example in the UI Controls tutorial shows how to build a list of names by selecting them from a combo box. Other documents were updated to reflect minor bug fixes. You can download JavaFX 2.2.3 from OTN. For all tutorials and API documentation, see http://docs.oracle.com/javafx. Other News: JavaFX Scene Builder 1.1 Developer Preview was released during the week of JavaOne and is available from OTN. This version contains support for the Linux and Mac OS X 10.8 platforms, and a preview of the new CSS Analyzer feature. See the release notes for more information.

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• How to do thread management in C++?

  - by Dipan Mehta

  We use pthread for thread management in C based systems. pthread is in general compilable by C++ compiler (like g++). However, what are the better ways of abstractions for threads in C++? Also, for making any system to be working in a multi-threaded system, it is also important to make thread safe. What are the standard libraries that requires alternative (installs) to be thread safe or are they unsafe for multi-threaded environments? Is smart pointers, templates require special measures to make it safe? What are the best practices for the thread managements in C++?

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• Show line breaks in asp:label inside gridview

  - by Vipin

  To show line breaks in asp:label element or for that matter inside Gridview, do the following  in case of Mandatory/ Nullable fields. <ItemTemplate>          <%# ((string)Eval("Details")).Replace("\n", "<br/>") %>  </ItemTemplate>    <ItemTemplate>          <%# FormatString(Eval("Details"))  %>  </ItemTemplate>   In code behind, add the following FormatString function - protected string FormatString(string strHelpMessage) { string rtnString = string.Empty; if (!string.IsNullOrEmpty(strHelpMessage)) rtnString = strHelpMessage.Replace(Environment.NewLine, "<br/>"); return rtnString; }

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• Adding unit tests to a legacy, plain C project

  - by Groo

  The title says it all. My company is reusing a legacy firmware project for a microcontroller device, written completely in plain C. There are parts which are obviously wrong and need changing, and coming from a C#/TDD background I don't like the idea of randomly refactoring stuff with no tests to assure us that functionality remains unchanged. Also, I've seen that hard to find bugs were introduced in many occasions through slightest changes (which is something which I believe would be fixed if regression testing was used). A lot of care needs to be taken to avoid these mistakes: it's hard to track a bunch of globals around the code. To summarize: How do you add unit tests to existing tightly coupled code before refactoring? What tools do you recommend? (less important, but still nice to know) I am not directly involved in writing this code (my responsibility is an app which will interact with the device in various ways), but it would be bad if good programming principles were left behind if there was a chance they could be used.

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• Lean/Kanban *Inside* Software (i.e. WIP-Limits, Reducing Queues and Pull as Programming Techniques)

  - by Christoph

  Thinking about Kanban, I realized that the queuing-theory behind the SW-development-methodology obviously also applies to concurrent software. Now I'm looking for whether this kind of thinking is explicitly applied in some area. A simple example: We usually want to limit the number of threads to avoid cache-thrashing (WIP-Limits). In the paper about the disruptor pattern[1], one statement that I found interesting was that producer/consumers are rarely balanced so when using queues, either consumers wait (queues are empty), or producers produce more than is consumed, resulting in either a full capacity-constrained queue or an unconstrained one blowing up and eating away memory. Both, in lean-speak, is waste, and increases lead-time. Does anybody have examples of WIP-Limits, reducing/eliminating queues, pull or single piece flow being applied in programming? http://disruptor.googlecode.com/files/Disruptor-1.0.pdf

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• User prompts (MessageBox) with MVVM

  - by mukapu

  The problem statement: I am tired of thinking how to show a simple message box or user prompt and act based on the response in Model-View-View-Model (MVVM). Common approaches: - It's ok, let's just do this one thing from ViewModel and mock this out for unit testing - Design my own dialog, then what to do from there - Can I write something in view code behind, ah yes, that seems to be the only way out, as anyway MVVM is still not matured...  - and what not?   I am pretty much one among the few frustrated out in this world looking for some convincing answers. I think we can do it a little neater without having the feeling of violating any of our self defined rules! Solution: The Control - Implement a simple control with no designer visibility. - Allow a property to be bound to tell when to show the MessageBox - Provide command binding for possible user actions, Yes, No, Cancel... How do I Use? - Just place the necessary XAML tags in the view - Implement the command for all user actions in the View Model - Run unit tests on the commands

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• Un système Linux embarqué opérationnel avec Buildroot, tutoriel par Benoit Mauduit

  Salut, Dans le domaine de l'embarqué, nous nous retrouvons souvent en situation où nous devons reconstruire un système complet à partir des sources, pour une architecture cible souvent différente de notre architecture hôte. Que l'on soit débutant ou développeur confirmé, la (cross-)compilation et l'organisation d'un système embarqué sont des étapes longues et fastidieuses, surtout lorsque les éléments du système à compiler nécessitent des adaptations. Il existe heureusement des outils libres qui simplifient et accélèrent cette tâche, en proposant généralement des fonctionnalités complémentaires intéressantes.Cet article est consacré à l'un de ces outils libres pour systèmes Linux embarqué : Buildroot.N'hésitez pas à poster ici vos commentaires sur cet article ...

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• MVC helper functions business logic

  - by Menelaos Vergis

  I am creating some helper functions (mvc.net) for creating common controls that I need in almost every project such as alert boxes, dialogs etc. If these do not contain any business logic and it's just client side code (html, js) then it's ok. My problem arises when I need some business logic behind this helper. I want to create a 'rate my (web) application' control that will be visible every 3 days and the user may hide it for now, navigate to rate link or hide it for ever. To do this I need some sort of database access and a code that acts as business logic. Normally I would use a controller for this, with my DI and everything, but I don't know where to put this code now. This should be placed in the helper function or in a controller that responds objects instead of ActionResults?

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• Get Your Workshop Hands On!

  - by Justin Kestelyn

  Now that 2010 is behind us, that means a fresh set of Developer Day workshops (still free, always free) are ahead of us! Developer Day workshops are free, hands-on workshops that give you the software and skills to tame that learning curve and reach the next level in your technical knowledge. We have a range of entrees on the menu, including Java Development, Database Application Development, Fusion Development (Oracle ADF), and more. Most of these workshops let you walk away with a fully functional, VirtualBox-based software appliance that you can use for continued learning. Here's a short list of workshops for which you can register right now: - Java: Boston, March 8- Database App Development: Dallas, March 9- SOA Development: Reston, March 9- Data Integration: Seattle, March 15 + others planned for Toronto, Philadelphia, Shanghai, Perth, Istanbul, and many other cities in 2011! See this URL for more workshop info as it becomes available.

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• OSB, Service Callouts and OQL - Part 1

  - by Sabha

  Oracle Fusion Middleware customers use Oracle Service Bus (OSB) for virtualizing Service endpoints and implementing stateless service orchestrations. Behind the performance and speed of OSB, there are a couple of key design implementations that can affect application performance and behavior under heavy load. One of the heavily used feature in OSB is the Service Callout pipeline action for message enrichment and invoking multiple services as part of one single orchestration. Overuse of this feature, without understanding its internal implementation, can lead to serious problems. This post will delve into OSB internals, the problem associated with usage of Service Callout under high loads, diagnosing it via thread dump and heap dump analysis using tools like ThreadLogic and OQL (Object Query Language) and resolving it. The first section in the series will mainly cover the threading model used internally by OSB for implementing Route Vs. Service Callouts. Please refer to the blog post for more details. 

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• AndEngine Foreground Sprite

  - by McGrey

  I'm developing an Android game and have some troubles: I want to add some foreground sprites, that must obstruct my player. Se the following example: Its a screenshot from "Shinobi 3". We can see the player, the enemy, the background and two foreground trees, that hide the player's arm and part of the enemy. I'm using AndEngine GLES2 Anchor Center and I am trying to add a new layer to my scene. Sprite Forest = new Sprite(getWidth() * 0.5f, textureHeightForest * 0.5f + 100, ResourcesManager.getInstance().foreground_forest_region, vbom); Entity foregroundLayer = new Entity(); foregroundLayer.attachChild(hillFurthest); attachChild(foregroundLayer); But it still shows behind my player sprite. I am trying to find something in HUD-class (it's always shown in the foreground), but got no results. Can anyone help please?

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• How do you set up PhysFS for use in a game?

  - by ThePlan

  After my recent question on GD I've been advised to use PhysFS to pack all my game data in 1 file. So I have, and the decission wasn't light, because I've tried out every library in my answers but none contained a single good tutorial whatsoever, in fact PhysFS is the poorest documented library I've ever seen. After attempting to set up PhysFS in my game I realized it's not as simple as adding the headers to the project, it appears something much more complicated, in fact after my first attempt to install PhysFS the compiler ran out of memory to display errors, it reached the critical count of 50 errors. So basically what I'm asking here is: How can I set up PhysFS on my game? I'm using Code::Blocks IDE on Windows XP SP3;

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• Bringing in New Architecture During Maintenance on Legacy Systems

  - by Mike L.

  I have been tasked with adding some new features to a legacy ASP.NET MVC2 project. The codebase is a disaster and I want to write these new features with some thought behind the implementation and not just throw these new features into the mess. I would like to introduce things like dependency injection and the orchestrator pattern; just to the code that I am going to write. I don't have enough time to try to refactor the entire system. Is it OK to not be consistent with the rest of the codebase and add new features following different design principles? Should I not introduce new patterns and just get the features implemented? I feel like it might be confusing to the next person to see parts of the system using a design that other parts are not following.

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• Kubuntu 11.10: How to remove "Search and launch"

  - by user38489

  Is it possible to remove the "Search and launch" whateveritis from my "desktop"? I've actually tried both Desktop and Netbook modes, but it stays there in both of them. I'm not afraid of editing files in the ~/.kde dir, but I would be really disappointed if this is the only way to do it. [more details/rants] I was able to wipe out several things but I've ended up with a black window that's movable (Alt-click) but not removable. Beside being surprised by the performances, I find Kubuntu extremely unfriendly, and I can't find the logic behind the items of the interface. I've tried to search for documentation, but what I've found is not updated and doesn't include the Netbook interface.

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• How to restart WiFi interface without rebooting (it drops connection)?

  - by Dima

  I boot into ubuntu and it connects to the Wifi network fine. After about 10-15min the DNS stop resolving any website and a couple of minutes later network-managers tells me that I'm disconnected and tries to reconnect constantly to my router and fails to do it. Upon Ubuntu restart everything works fine for the first 10-15min again. When I boot into Mac OS X everything is fine with the same connection! How do I restart wifi interface? sudo ifdow wlan0 just tells me that wlan0 is not configured and wlan0 doesn't appear in /etc/network/interfaces either, which I find strange.... (unless network-manager is doing it behind my back).

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• 'dock' working in simple words

  - by Shirish11

  I would like to know the idea behind the working of 'docking' in applications. I have worked with applications where components from individual forms are docked on a single main form to provide the necessary GUI. But I don't have any idea whats happening in the background. According to Wikipedia A dock is a graphical user interface element that typically provides the user with a way of launching, switching between, and monitoring running programs or applications. Now I am a bit confused if it is some component or an event or a property or something else. EDIT : The applications was developed in Delphi on windows platform. There is something more in Delphi (manual dock and automatic dock).

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• Approaching SICP in Clojure instead of Scheme

  - by ironicaldiction

  I am a third year bachelor student in a software engineering program, and I brought up the idea of reading SICP to an adviser to gain a deeper and more fundamental understanding of the principles behind all this software we engineer. He suggested not to learn Scheme to complete the book (because it's not as common as modern dialects of Lisp) but to do the exercises in Clojure instead. It's an already difficult book, if I do attempt the book's exercises in the more modern Clojure, how would that work? For example, I can't find any real solutions, the syntax they teach for Scheme is different, etc.

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• dhcp configuration not working ubuntu 11.10

  - by Vivek Pradhan

  I am usually behind a proxy server in college so I connect to the ethernet or wifi using manual IPv4 addresses only inside college. I have been trying really hard to get the internet work at home, there is no proxy and I have set the network to use automatic dhcp. It seems like it is not able to connect to the port, It gets disconnected after some time automatically and then tries to reconnect. The same thing is happening with wifi networks also, after some time i see a pop up asking for authentication and ultimately its not able to connect. What might be the problem here. I looked up some similar questions and checked the /etc/network/interfaces file and looks like this: auto lo iface lo inet loopback I have no idea what those lines mean but there is no configuration for eth0 or wlan0. Any help is deeply appreciated. Ubuntu loses it charms due to these small glitches.

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• Is Java much harder to "tweak" for performance compared with C/C++?

  - by user997112

  Does the "magic" of the JVM hinder the influence a programmer has over micro-optimisations in Java? I recently read in C++ sometimes the ordering of the data members can provide optimizations (granted, in the microsecond environment) and I presumed a programmer's hands are tied when it comes to squeezing performance from Java? I appreciate a decent algorithm provides greater speed-gains, but once you have the correct algorithm is Java harder to tweak due to the JVM control? If not, could people give examples of what tricks you can use in Java (besides simple compiler flags).

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• Débat : Comment se préparer à participer à un projet Open Source important comme par exemple le serv

  Bonjour, Pour quelques besoins que j'ai de passage rapide en JEE 6, et parce que je pense que l'expérience est intéressante, je crois devoir intervenir sur le code source de Glassfish v3, encore jeune. Mais il y a loin de la coupe aux lèvres. Et si j'ai pu télécharger l'environnement et le compiler pour me faire ma propre distribution binaire, cela ne fait certainement pas de moi un développeur digne d'intégrer une communauté constituée de membres solides. Ceux-là n'ont pas à se perdre avec de nouveaux arrivants, néophytes, qui adopteraient par leur méconnaissance des comportements brutaux. C'est bien ce que je veux éviter. Le projet Glassfish est important, il est sur java.net. Mais d'autres tout aussi ambitieux exis...

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• Tic-Tac-Toe game AI

  - by David Jones

  I'm looking into creating a simple tic tac toe/noughts and crosses game in Actionscript3 and am trying to understand the ideas behind the AI used in a game like this. I've seen some simplistic examples online but from what I've read a game tree or something like minimax is the best way to go about this. Can anyone help explain or reference any good examples of this? I've seen that there is a library called as3ds - data structures for game developers which has a number of classes that might help tie this together? Any info/examples or help is much appreciated.

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• Does approaching SICP in clojure have a high chance of success? [on hold]

  - by ironicaldiction

  I am a third year bachelor student in a software engineering program, and I brought up the idea of reading SICP to an adviser to gain a deeper and more fundamental understanding of the principles behind all this software we engineer. He suggested not to learn scheme to complete the book (because it's not as common as modern dialects of lisp) but to do the exercises in clojure instead. My worry is that completing exercises in clojure instead of scheme will make an already difficult book tortuous. If I do attempt the book's exercises in the more modern clojure, will it be difficult to succeed (for example, because I can't find any real solutions, the syntax they teach for scheme is different, etc.), or do you think approaching the book in clojure could be just as successful as approaching it in scheme? I'm really not knowledgeable enough about either clojure or scheme to make an argument about this, so I wanted to know if I should bring it up or not.

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• Design leaderboard ratings for quiz games

  - by PeterK

  Back in March 2011 i started the following post: How to design a leaderboard? Now my quiz game have been out for approximately a year and sold pretty decently. I am working on to update the game design and is again looking into the leaderboard design to make it better as i am not happy with it. Currently i rate players on number of correct answers, which is not good as it does not consider things like number of games, difficulty levels etc. I also have "extended" stats behind the UITableView (Leaderboard). A player can play based on three levels of difficulty: hard, medium or easy Difficulty levels can be mixed between players in a game Each game can be one to six players, so there can be single games or duels Between 2 and 30 questions per game As i am considering integrating Game Center Leaderboard i need to design a better rating system so i would like to ask for some ideas how to do the rating based on the above. I am thinking about how much a point would be worth and what it includes.

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