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• Best choice for 3D Physics Engine for C#/XNA

  - by Nic Foster

  Since 2007 I've been working on the development of an open-source game engine, and have been using JigLibX for 3D Physics. However, the developers on the project have stopped contributing to it for over 2 years now, and it's lacking features I need, or have major bugs in certain features. What are some good choices for 3D physics engines that are written purely in C#? Are there any that are more complete than JigLibX? EDIT: I just stumbled upon an engine called BEPUphysics. It was supported up until May 2012, which is fairly recent. I may check it out, any information that you guys could give on how complete the engine is would be great.

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• How to Detect and Fix an Infected PC

  You may have noticed that your PC is not acting the way it used to when you first purchased it. If so, malware may be the culprit. Here are some ways to detect if your PC has been infected, as well as methods to correct any such problems to get things back to normal, as suggested by researcher Tim Armstrong of Kaspersky Lab. Malware Detection Irritating Popups Irritating popup windows are one of the telltale signs that your PC is infected with malware. One of the most common classes of malware driven popup windows comes in the form of scareware, or fake antivirus warnings. These popups tel...

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• Vancouver .NET User Group

  While in Vancouver for my Silverlight training in early May, I will give a free Silverlight presentation at the local .NET User Group, .netBC. When: May 5, 2010, 6:30 PM Where: Building SW3 room 1750, BCIT Burnaby Campus, 3700 Willingdon Ave, Burnaby, BC, V5G 3H2 What: Silverlight 4 Business Applications In this session a live demo will be built to show the new features of Silverlight 4 that helps you create business-oriented applications easier than ever. Importing/exporting data, printing,...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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• Can't install libapache2-mod-php5

  - by chris

  When I try to install libapache2-mod-php5, I get an error: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help resolve the situation: The following packages have unmet dependencies: libapache2-mod-php5 : Depends: apache2-mpm-prefork (> 2.0.52) but it is not going to be installed or apache2-mpm-itk but it is not going to be installed E: Unable to correct problems, you have held broken packages. I have tried apt-get clean, update and upgrade, as well as -f install, and no change. Is there a way to fix this, or is there an easy way to manually install the php plugin?

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• Problem! I can't add work areas in gnome flashback ubuntu 14.04 or make the alt-tab work!

  - by user2970454

  Please, I have been dealing with the alt-tab problem for a long time. I have alreade check keyboard shortcuts in the configuration panel but it still doesn't work. (I already had this problem in ubuntu 12.04, but since I installed 14.04 another problem came arround. I can't add work spaces. I tryed changing the amount of work areas by right clicking in the desktop's miniature but it does't chenge. Anyone can help me find this parameters in a file wich I may be able to edit using "sudo nano" or something similar? Thaks! PS: I also have problems with the backlight but that may be another issue since I had to install samsung-backlight in 12.04 but it isn't availabe for 14.04. I just mention it in case someone knows somthing about it.

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• Unable to install Emerald theme manager in Ubuntu 12.04?

  - by kernel_panic

  I learnt how to install ETM from here But when i try to install i get `ubu@sanjay-pc:~$ sudo apt-get install git autoconf libtool libwnck1.0-cil-dev libwnck-dev intltool libdecoration0-dev gawk Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming.code The following information may help to resolve the situation: The following packages have unmet dependencies: libdecoration0-dev : Depends: libdecoration0 (= 1:0.9.7.6-0ubuntu1) but 1:0.9.7.8-0ubuntu1 is to be installed E: Unable to correct problems, you have held broken packages. ` Help Needed

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• Not able to install nspluginwrapper on 64 bit Ubuntu 12.10

  - by user99305

  This is a brand new installation of 64 bit Ubuntu 12.10. I am not able to install nspluginwrapper. Here is the error message that I get: $ sudo apt-get install nspluginwrapper Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: nspluginwrapper : Depends: nspluginviewer (= 1.4.4-0ubuntu4) but it is not installable E: Unable to correct problems, you have held broken packages. I need nspluginwrapper to get Citrix receiver to work.

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• Where to go from here, how to improve / learn more

  - by bExplosion

  I finished University around 4 years ago double degree in Software Eng/Comp Sci. Got my first job at a startup in my final year, was with them for 2.5 years then started my own business. So far everything is going great, lots of clients and stead work etc, but coming right out of uni and into a start up I never had any form or senior software engineer guiding my work or suggesting improvements etc... Whats the best way for me to improve & learn more? Books? MS Exams? Other? I develop in C#, ASP.NET/MVC. Update The problem isn't really with releasing products, I've released quite a few which are up and running with customers happy. It's more with quality of code, best practices, how do I know something I am code is correct, it may work but there may be ways of coding it much more efficiently or by adhering to some kind of standard Cheers for any responses! Matt

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• Syncing objects to a remote server, and caching on local storage

  - by Harry

  What's the best method of sycing objects (as JSON) to a remote server, with local caching? I have some objects that will pretty much just be plain-text with some extra meta-data. I was thinking of perhaps including a "last modified date" for both Local storage and Remote storage. This could then be used to determine which object is the most recent. For example, even though objects will be saved to both local and remote when they are saved, sometimes the user may not have internet access, or the server may be down, or any other number of things. In this case, the last modified date for remote storage would be reverted to its previous date. Local storage would remain as it is. At this point, the user could exit the application, and when they reload the application would then look at the last modified dates of the local and remote storages, and decide. Is there anything I'm missing with this? Is there a better method that I could use?

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• Oracle Endeca Training UK - April 10th, 11th

  - by Grant Schofield

  By popular demand we have decided to hold a second Oracle Endeca Information Discovery Training event in the UK to accommodate those who were unable to get into the first. Training is currently being planned for early May in Switzerland, end of May in Germany and mid-June in Istanbul at the EMEA BI annual event. Date: 10th - 11th April Venue: Oracle Reading, UK A registration link will be sent out shortly, but to avoid disappointment please bookmark this article and block these two days in your diary. You can also register interest by emailing me directly and I will operate a first come, first serve policy - [email protected]

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• Microsoft's Windows Phone 7 Moves Toward Final Release

  Signs in the latest emulator suggest that the operating system may be nearing "release candidate" stage.

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• Microsoft's Windows Phone 7 Moves Toward Final Release

  Signs in the latest emulator suggest that the operating system may be nearing "release candidate" stage.

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• When is it time to start afresh instead of trying to rewrite the existing project?

  - by gablin

  As projects grow and age and new features are introduced, there may come a time when it's probably better to start anew. Some features may require so much rewriting that it would be easier (and maybe faster) to just rewrite the whole thing from scratch. Also, then you have the opportunity to apply what you've learned from the first project and thus improve the code and design of the successor. Is there a way of recognizing when this time is? Is it just a gut feeling, or could you say that "after x years, you probably should start over", or some other rule of thumb?

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• Managed servers getting down regularly by Node Manager. WAD?

  - by csoto

  Recently I have been working on a service request where several instances were running, and several technologies were being used, including SOA, BAM, BPEL and others. At a first glance, this may seem to be a Node Manager problem. But on this situation, the problem was at JMS - Persistent Store level. Node Manager can automatically restart Managed Servers that have the "failed" health state, or have shut down unexpectedly due to a system crash or reboot. As a matter of fact, from the provided log files it was clear that the instance was becoming unhealthy because of a persist6ent Store problem. So finally, the problem here was not with Node Manager as it was working as designed, and the restart was being caused by the Persistent Store. After this Persistent Store problem was fixed, everuthing went fine. This particular issue that I worked was on an Exalogic machine, but note that this may happen on any hardware running Weblogic.

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• E-Commerce Website

  - by haargott

  I am planning to create an e-commerce website for users to buy products and services. In this website I want users to register and also participate in something like a browser game, where every user may receive some questions which they have to answer. For each question they successfully answered, they receive points and the number of collected points will decide on which rank they are. Edit 2 Currently I am considering using only HTML, CSS, JavaScript, PHP, SQL to design this e-commerce website. Together with this I was thinking about learning jQuery as it may help me, but I am not sure if I should code everything specifically by myself or just use the library to make it faster. 1) Could you tell me if those languages are sufficient enough for creating such a website described? 2) Could you tell me what kind of free software tools and frameworks are most appropriate to use when creating this e-commerce website?

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• I Can't update 12.04 to 12.10 ERROR:"gpg: WARNING: This key is not certified with a trusted signature!"

  - by jason328

  I'm trying to update to 12.10 from a 12.04 machine. When I ran the code sudo do-release-upgrade -d in my terminal and verified my password it checked for a new upgrade. I was then returned with this: gpg: Good signature from "Ubuntu Archive Automatic Signing Key <[email protected]>" gpg: WARNING: This key is not certified with a trusted signature! gpg: There is no indication that the signature belongs to the owner.` There of course is more but it looks like it may or may not be showing private information with it. What's causing this and how do I fix this.

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• I know of three ways in which SRP helps reduce coupling. Are there even more? [closed]

  - by user1483278

  I'd like to figure all the possible ways SRP helps us reduce coupling. Thus far I can think of three: 1) If class A has more than one responsibility, these responsibilities become coupled and as such changes to one of these responsibilities may require changes to other of A's responsibilities. 2) Related functionality usually needs to be changed for the same reason and by grouping it togerther in a single class, the changes can be made in as few places as possible ( at best changes only need be made to the class which groups together these functionalities) 3) Assuming class A performs two tasks ( thus may change for two reasons ), then number of classes utilising A will be greater than if A performed just a single task ( reason being that some classes will need A to perform first task, other will need A for second task, and still others will utilise it for both tasks ).This also means that when A breaks, the number of classes ( utilising A ) being impaired will be greater than if A performed just a single task. Can SRP also help reduce coupling in any other way, not described above? Thank you

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• Processing a list of atomic operations, allowing for interruptions

  - by JDB

  I'm looking for a design pattern that addresses the following situation: There exists a list of tasks that must be processed. Tasks may be added at any time. Each task is wholly independent from all other tasks. The order in which tasks are processed has no effect on the overall system or on the tasks themselves. Every task must be processed once and only once. The "main" process which launches the task processors may start and stop without warning. When stopped, the "main" process loses all in-memory data. Obviously this is going to involve some state, but are there any design patterns which discuss where and how to maintain that state? Are there any relevant anti-patterns? Named patterns are especially helpful so that we can discuss this topic with other organizations without having to describe the entire problem domain.

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• My webcam stopped working, how do I fix it?

  - by Delilah

  I'm using Ubuntu 10.10 on a new Compaq Presario CQ56. The webcam was working fine for the first two days, in both Skype and Cheese, but simply turned black with thin vertical lines in the middle of a Skype call and now refuses to work in any program, including gstreamer-properties, Cheese, and VLC. It gives a black screen when rebooted into a live CD and tested. When tested, it either shows a plain black screen or black with thin vertical lines. Attached is an image of the video shown (it is static, there is no noise or static, and no response to variance in light). Also, when I play music or sounds, it makes a garbled noise related to the sound being played, which may or may not be connected to the webcam issue. If anyone has any ideas on what caused this, or whether it's a hardware or software issue, or how to fix it, I would appreciate them very much, Thanks

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• What is the SEO-recommended method for using underscores and dashes in URLs that contain geographic locations?

  - by ElHaix

  In reading through this article: In Subfolder & File Names, Use Dashes, Not Underscores Good: Good: http://www.domain.com/sub-folder/file-name.htm Bad: http://www.domain.com/sub_folder/file_name.htm In my URL's, I may have one or two city names, ending with the province/state: Burnaby_New_Westminister-BC/[some search term]. My URL rules currently are defined such that everything after the dash is the prov/state. Some geographic locations already contain dashes: Notre-Dame-de-Grâce (in QC), which I would convert to ~/Notre_Dame_de_Grace-QC/ I thought of placing the prov/state after another "/", however in some cases the province/state name may not exist, thus ~/Notre_Dame_de_Grace/, so the first term after the domain name contains the geo location {city, city_name-state}. I am now revisiting this, and wondering if this rule set should change, and if so, what is the recommended way of implementing this? -- UPDATE -- After reviewing this video, I see that I should be using the dashes, rather than underscores. However since I still want to have my geo locations in the first URL section, is there anything wrong with using a double-dash separator - ie: /city-name--state/ ?

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• A Simple Entity Tagger

  - by Elton Stoneman

  In the REST world, ETags are your gateway to performance boosts by letting clients cache responses. In the non-REST world, you may also want to add an ETag to an entity definition inside a traditional service contract – think of a scenario where a consumer persists its own representation of your entity, and wants to keep it in sync. Rather than load every entity by ID and check for changes, the consumer can send in a set of linked IDs and ETags, and you can return only the entities where the current ETag is different from the consumer’s version.  If your entity is a projection from various sources, you may not have a persistent ETag, so you need an efficient way to generate an ETag which is deterministic, so an entity with the same state always generates the same ETag. I have an implementation for a generic ETag generator on GitHub here: EntityTagger code sample. The essence is simple - we get the entity, serialize it and build a hash from the serialized value. Any changes to either the state or the structure of the entity will result in a different hash. To use it, just call SetETag, passing your populated object and a Func<> which acts as an accessor to the ETag property: EntityTagger.SetETag(user, x => x.ETag); The implementation is all in at 80 lines of code, which is all pretty straightforward: var eTagProperty = AsPropertyInfo(eTagPropertyAccessor); var originalETag = eTagProperty.GetValue(entity, null); try { ResetETag(entity, eTagPropertyAccessor); string json; var serializer = new DataContractJsonSerializer(entity.GetType()); using (var stream = new MemoryStream()) { serializer.WriteObject(stream, entity); json = Encoding.UTF8.GetString(stream.GetBuffer(), 0, (int)stream.Length); } var guid = GetDeterministicGuid(json); eTagProperty.SetValue(entity, guid.ToString(), null); //... There are a couple of helper methods to check if the object has changed since the ETag value was last set, and to reset the ETag. This implementation uses JSON to do the serializing rather than XML. Benefit - should be marginally more efficient as your hashing a much smaller serialized string; downside, JSON doesn't include namespaces or class names at the root level, so if you have two classes with the exact same structure but different names, then instances which have the same content will have the same ETag. You may want that behaviour, but change to use the XML DataContractSerializer if you think that will be an issue. If you can persist the ETag somewhere, it will save you server processing to load up the entity, but that will only apply to scenarios where you can reliably invalidate your ETag (e.g. if you control all the entry points where entity contents can be updated, then you can calculate and persist the new ETag with each update).

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• What can I do when the interviewer doesn't know the answer to his/her own question?

  - by bjskishore123

  Yesterday I had a terrible experience in an interview. Interviewer asked me about pure virtual function. I said, It may or may not have definition in base class, but derived classes should provide definition unless they also want to be abstract class. But interviewer kept on asking that "Can pure virtual have definition !!! ???"... I said yes. Again he said "Pure ?" I said yes. It is allowed, derived classes can explicitly call that function if they want that particular behavior. He sent me out. I am sure that he doesn't know the fact that pure virtual function can have definition. How to deal with this kind of Interviewers ? After asking 2nd time, should i lie that it can't have definition ? :) Or i should stick to my words and loose the job opportunity ?

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• Can I use the same machine as a client and server for SSH?

  - by achraf

  For development tests, I need to setup an SFTP server. So I want to know if it's possible to use the same machine as the client and the server. I tried and I keep getting this error: > Permission denied (publickey). > Connection closed and by running ssh -v agharroud@localhost i get : > OpenSSH_3.8.1p1,OpenSSL 0.9.7d 17 Mar > debug1: Reading configuration data /etc/ssh_config > debug1: Connecting to localhost [127.0.0.1] port 22. > debug1: Connection established. > debug1: identity file /home/agharroud/.ssh/identity type -1 > debug1: identity file /home/agharroud/.ssh/id_rsa type 1 > debug1: identity file /home/agharroud/.ssh/id_dsa type -1 > debug1: Remote protocol version 2.0, remote software version OpenSSH_3.8.1p1 > debug1: match: OpenSSH_3.8.1p1 pat OpenSSH* > debug1: Enabling compatibility mode for protocol 2.0 > debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1 > debug1: SSH2_MSG_KEXINIT sent > debug1: SSH2_MSG_KEXINIT received > debug1: kex:server->client aes128-cbc hmac-md5 none > debug1: kex: client->server aes128-cbc hmac-md5 none > debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent > debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP > debug1: SSH2_MSG_KEX_DH_GEX_INIT sent > debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY > debug1: Host 'localhost' is known and matches the RSA host key. > debug1: Found key in /home/agharroud/.ssh/known_hosts:1 > debug1: ssh_rsa_verify: signature correct > debug1: SSH2_MSG_NEWKEYS sent > debug1: expecting SSH2_MSG_NEWKEYS > debug1: SSH2_MSG_NEWKEYS received > debug1: SSH2_MSG_SERVICE_REQUEST sent > debug1: SSH2_MSG_SERVICE_ACCEPT > received > > ****USAGE WARNING**** > > This is a private computer system. This computer system, including all > related equipment, networks, and network devices (specifically > including Internet access) are provided only for authorized use. This > computer system may be monitored for all lawful purposes, including to > ensure that its use is authorized, for management of the system, to > facilitate protection against unauthorized access, and to verify > security procedures, survivability, and operational security. Monitoring > includes active attacks by authorized entities to test or verify the > security of this system. During monitoring, information may be > examined, recorded, copied and used for authorized purposes. All > information, including personal information, placed or sent over this > system may be monitored. > > Use of this computer system, authorized or unauthorized, > constitutes consent to monitoring of this system. Unauthorized use may > subject you to criminal prosecution. Evidence of unauthorized use collected > during monitoring may be used for administrative, criminal, or other > adverse action. Use of this system constitutes consent to monitoring for > these purposes. > > debug1: Authentications that can continue: publickey > debug1: Next authentication method: publickey > debug1: Trying private key:/home/agharroud/.ssh/identity > debug1: Offering public key:/home/agharroud/.ssh/id_rsa > debug1:Authentications that can continue:publickey > debug1: Trying private key:/home/agharroud/.ssh/id_dsa > debug1: No more authentication methods to try. > Permission denied (publickey). Any ideas about the problem ? thanks !

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• Should Scala IDE Worksheets be part of your open git repository?

  - by JacobusR

  Those familiar with Scala IDE will know about the great testing environment offered by the Scala Worksheet. You can scribble and scratch, much like in the REPL, but with all the goodness added by the IDE as a whole (refactoring, saving, error checking, etc). When you create a worksheet, it is created with the .sc extension, and also creates a artifact under a hidden directory called .worksheet. This is all fine and dandy, but should one include these in your public .git repositories? People who does not use Scala IDE (or older versions) may find these files confusing. On the other hand, making some of your experiments public to developers who are using Scala IDE, may give them a quick start into experimenting and learning the project.

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• SQL Saturday #38 - Jacksonville Call for Speakers

  If you want to speak at SQL Saturday #38 in Jacksonville, FL on May 8, 2010, there's still time to submit a session.

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