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• Enabling Multi-touch features of the Apple Magic Mouse on Ubuntu 12.04

  - by Martin

  I want to write a simple app that uses Apple's Magic Trackpad, nothing special, just so that it recognizes atleast one gesture. The thing is, Ubuntu itself doesnt really recognize this device. I'm using Ubuntu 12.04 and by default the device works with 1 finger, but without tap-click or doubletap, 3 fingers move the window and 3 finger spread makes it fullscreen. I managed to enable 2 finger scrolling with "xinput set-prop 8 'Two-Finger Scrolling' 1 1", but thats about it. No other gestures work, ginn doesnt start, giesview detects the device but doesnt respond to any of the gestures, and touchegg doesnt start either. I tried example apps from qt that come with ubuntu but they dont work. So... what do i do? i tried using qt but all i get from the app is "Got touch without getting TouchBegin for id XX" what else can i use to get my app to work with multitouch devices?

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• Beginning HTML and CSS [closed]

  - by romani

  My goal of learning HTML and CSS is to be able to modify popular scripts such as Wordpress, vBulletin, Drupal, etc. I haven't started yet learning CSS and HTML or XHTML. I see many, many books and tutorials out there so it is difficult to make a choice. I think most of web designers were like me in the past and have read many books. So, could you tell me about 1 good book for HTML and 1 good book for CSS? and if I should read the book from cover to cover or only learning the basics is enough for modifying Wordpress, for example!

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• Advantages and Disadvantages of the Waterfall Methodology

  In my personal opinion I believe the waterfall method is one of the worst methodologies to use when developing larger systems because it leaves is no room for mistakes. As the name implies the waterfall methodology does not allow  for projects to go back up stream to recover from design errors, missing and/or limited requirements. In addition, hidden bugs are not usually found until the testing phase. This can prove to be very costly and time consuming to the developer and the client. According to NCycles.com, the waterfall methodology structures a project into separate stages with defined deliverables from each phase. Define Design Code Test Implement Document and Maintain The advantages found by Ncycle.com to this methodology are: Ease in analyzing potential changes  Ability to coordinate larger teams, even if geographically distributed Can enable precise dollar budget Less total time required from Subject Matter Experts The disadvantages found by Ncycle.com to this methodology are: Lack of flexibility Hard to predict all needs in advance Intangible knowledge lost between hand-offs Lack of team cohesion Design flaws not discovered until the Testing phase References: NCycles.com  (2002). Retrieved from http://www.ncycles.com/e_whi_Methodologies.htmmethodology on April 17, 2009

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• Update Manager won't open (error related to pythonverbose)

  - by Mateus Machado Luna

  I'm having an issue with update-manager. Last night, my computer restart suddenly during the update process. Now it won't open and it keep appearing on the notifier with a message warning that an error occurred. The error is the same that is displayed when I try to open it on the terminal: Error in sitecustomize; set PYTHONVERBOSE for traceback: EOFError: EOF read where not expected Traceback (most recent call last): File "/usr/bin/update-manager", line 26, in <module> from __future__ import print_function EOFError: EOF read where not expected I've already seen some questions here, but most of them are related to problems with ppas and the source.list file. This seems to be a bug on update-manager itself. I've already tried to remove it and install again, but the problem persists. I also noted another bug: my source-center doesn't open too. The message for it is similar to the other one: Error in sitecustomize; set PYTHONVERBOSE for traceback: EOFError: EOF read where not expected Traceback (most recent call last): File "/usr/lib/command-not-found", line 5, in <module> from __future__ import absolute_import, print_function EOFError: EOF read where not expected For now I'm using apt-get update && upgrade for updating and the Synaptic for the source management. But I really would like to fix this stuff. Anyone can help? I'm with Ubuntu 12.10, Gnome-remix, 64-bits.

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• How would you gather client's data on Google App Engine without using Datastore/Backend Instances too much?

  - by ruslan

  I'm relatively new to StackExchange and not sure if it's appropriate place to ask design question. Site gives me a hint "The question you're asking appears subjective and is likely to be closed". Please let me know. Anyway.. One of the projects I'm working on is online survey engine. It's my first big commercial project on Google App Engine. I need your advice on how to collect stats and efficiently record them in DataStore without bankrupting me. Initial requirements are: After user finishes survey client sends list of pairs [ID (int) + PercentHit (double)]. This list shows how close answers of this user match predefined answers of reference answerers (which identified by IDs). I call them "target IDs". Creator of the survey wants to see aggregated % for given IDs for last hour, particular timeframe or from the beginning of the survey. Some surveys may have thousands of target/reference answerers. So I created entity public class HitsStatsDO implements Serializable { @Id transient private Long id; transient private Long version = (long) 0; transient private Long startDate; @Parent transient private Key parent; // fake parent which contains target id @Transient int targetId; private double avgPercent; private long hitCount; } But writing HitsStatsDO for each target from each user would give a lot of data. For instance I had a survey with 3000 targets which was answered by ~4 million people within one week with 300K people taking survey in first day. Even if we assume they were answering it evenly for 24 hours it would give us ~1040 writes/second. Obviously it hits concurrent writes limit of Datastore. I decided I'll collect data for one hour and save that, that's why there are avgPercent and hitCount in HitsStatsDO. GAE instances are stateless so I had to use dynamic backend instance. There I have something like this: // Contains stats for one hour private class Shard { ReadWriteLock lock = new ReentrantReadWriteLock(); Map<Integer, HitsStatsDO> map = new HashMap<Integer, HitsStatsDO>(); // Key is target ID public void saveToDatastore(); public void updateStats(Long startDate, Map<Integer, Double> hits); } and map with shard for current hour and previous hour (which doesn't stay here for long) private HashMap<Long, Shard> shards = new HashMap<Long, Shard>(); // Key is HitsStatsDO.startDate So once per hour I dump Shard for previous hour to Datastore. Plus I have class LifetimeStats which keeps Map<Integer, HitsStatsDO> in memcached where map-key is target ID. Also in my backend shutdown hook method I dump stats for unfinished hour to Datastore. There is only one major issue here - I have only ONE backend instance :) It raises following questions on which I'd like to hear your opinion: Can I do this without using backend instance ? What if one instance is not enough ? How can I split data between multiple dynamic backend instances? It hard because I don't know how many I have because Google creates new one as load increases. I know I can launch exact number of resident backend instances. But how many ? 2, 5, 10 ? What if I have no load at all for a week. Constantly running 10 backend instances is too expensive. What do I do with data from clients while backend instance is dead/restarting? Thank you very much in advance for your thoughts.

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• Microsoft and innovation: IIF() method

  This Saturday I was watching a couple of eLearning videos from TrainSignal (thanks to the subscription I have with Pluralsight) on Querying Microsoft SQL Server 2012 (exam 70-461). 'Innovation' by Microsoft I kept myself busy learning 'new' things about Microsoft SQL Server 2012 and some best practices. It was incredible 'innovative' to see that there is an additional logic function called IIF() available now: Returns one of two values depending on the value of a logical expression. IIF(lExpression, eExpression1, eExpression2) Ups, my bad... That's actually taken from the syntax page of Visual FoxPro 9.0 SP 2. And tada, at least seven (7+) years later, there's the recent IIF() Transact-SQL version of that function: Returns one of two values, depending on whether the Boolean expression evaluates to true or false in SQL Server 2012. IIF ( boolean_expression, true_value, false_value ) Now, that's what I call innovation! But we all know what happened to Visual FoxPro... It has been reincarnated in form of Visual Studio LightSwitch (and SQL Server). Enough ranting... Happy coding!

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• Hosting multiple client website on single

  - by Bhavesh Gangani

  I'm WebDesiner and i've currently only a few clients for making website. i've unlimited hosting account and i want to host their websites in my account without reseller account ( actually it is not needed for constness). only my client's need is ftp access to their personal directory. so as i questioned it is possible to give them saperate phpmyadmin access in this strategy ? as per my knowledge it is done with "addon" domain pointing on my hosting account's directory with cpanel, am i right ? or there is another solution for it except reseller account ?

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• Building a Redundant / Distrubuted Application

  - by MattW

  This is more of a "point me in the right direction" question. I (and my team of 3) have built a hosted web app that queues and routes customer chat requests to available customer service agents (It does other things as well, but this is enough background to illustrate the issue). The basic dev architecture today is: a single page ajax web UI (ASP.NET MVC) with floating chat windows (think Gmail) a backend Windows service to queue and route the chat requests this service also logs the chats, calculates service levels, etc a Comet server product that routes data between the web frontend and the backend Windows service this also helps us detect which Agents are still connected (online) And our hardware architecture today is: 2 servers to host the web UI portion of the application a load balancer to route requests to the 2 different web app servers a third server to host the SQL Server DB and the backend Windows service responsible for queuing / delivering chats So as it stands today, one of the web app servers could go down and we would be ok. However, if something would happen to the SQL Server / Windows Service server we would be boned. My question - how can I make this backend Windows service logic be able to be spread across multiple machines (distributed)? The Windows service is written to accept requests from the Comet server, check for available Agents, and route the chat to those agents. How can I make this more distributed? How can I make it so that I can distribute the work of the backend Windows service can be spread across multiple machines for redundancy and uptime purposes? Will I need to re-write it with distributed computing in mind? I should also note that I am hosting all of this on Rackspace Cloud instances - so maybe it is something I should be less concerned about? Thanks in advance for any help!

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• Becoming a "maintenance developer"

  - by anon

  So I've kind of been getting angry about the current position I'm in, and I'd love to get other developers' input on this. I've been at my current place of employment for about 11 months now. When I began, I was working on all new features. I basically worked on an entire new web project for the first 5-6 months I was here. After this, I was moved to more of a service oriented role (which was still great, all new stuff for me), and I was in this role for about the past 5-6 months. Here's where the problem comes in. Basically, a couple of days ago I was made the support/maintenance guy. Now, we have an IT support team, so I'm not talking that kind of support, I'm talking more of a second level support guy (when the guys on the surface can't really get to the root of the issue), coupled with working on maintenance issues that have been lingering in the backlog for a while. To me, a developer with about 3 years of experience, this is kind of disheartening. With the type of work place this is, I wouldn't be surprised if these support issues take up most of my days, and I barely make it to working on maintenance issues. Also, most of these support issues aren't even related to code, they are more or less just knowing the system architecture, working with making sure services are running/getting started properly, handling/fixing bad data, etc. I'm a developer, so this part sucks. Also, even when I do have time to work maintenance, these are basically just bug fixes/improving bad code, so this sucks as well, however at least it's related to coding. Am I wrong for getting angry here? I don't want to really complain about it, but to be honest, I wasn't spoken to about this or anything, I was kind of just sent an e-mail letting me know I'm the guy for this type of thing, and that was that. The entire team took a few minutes to give me their "that sucks" talk, because they know how annoying it is to be on support for the type of work we do, so I know I'm not the only guy that knows it's not that great of an opportunity. I'm just kind of on the fence about how to move forward. Obviously I'm just going to continue working for the time being, no point making a bad impression on anybody, but I'd like to know how you guys would approach this situation, or how you think I should be feeling about it/how you guys would feel. Thanks guys.

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• What do I need to develop a PHP extension in lampp?

  - by Fernando Costa

  Actually I'm dealing with a trouble in my system, I have to delivery the system to clients and it was built in PHP, JS, ShellScript and SQL. I would like to encrypt the code or obfuscate it from eyes of others! Then someone from the community told me about build my own PHP extension, it sounds to me as a great idea, since it will not be with the main code of the system. But I have a problem doing this way, if a programmer get in the extensions and find it, all the hard work has gone. Then I'm here to ask again about this matter. What is the best way to hide my Business Logic from third parties? I know that has stuffs like IonCube, Zend Guard, and many others. But I'm looking something that I can build myself. Is PHP extension the right way to follow? Or some Half SaaS system, with dependencies (Business Logic) in a remote server? About the environment OS: Kernel Linux 2.6.37.1-1.2 - LAMPP (Apache 2.2, MySQL 5.5 PHP 5.3.8) In php generally the extension is located at /php/ext/ but in lampp I have no idea where it is, I just found a folder /opt/lampp/lib/php/extensions/ is that right place?

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• Using XNA to learn to build a game, but wanna move on [closed]

  - by Daniel Ribeiro

  I've been building a 2D isometric game (with learning purposes) in C# using XNA. I found it's really easy to manage sprite sheets loading, collision, basic physics and such with the XNA api. The thing is, I want to move on. My real goal is to learn C++ and develop a game using that language. What engine/library would you guys recommend for me to keep going on that same 2D isometric game direction using pretty much sprite sheets for the graphical part of the game?

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• Storing application preferences and data

  - by Rudi Strydom

  I am looking at creating some Ubuntu applications, but finding good resoures are hard. I am using the quickly toolkit, but would really like some more insight. How does one normally store application preferences and settings in Linux / Ubuntu. Is it as simple as creating a XML file and saving the information and then reading from said file on application bootstrap? If someone can point me in a direction it would be greatly appreciated.

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• When to start thinking about scalability?

  - by Rits

  I'm having a funny but also terrible problem. I'm about to launch a new (iPhone) app. It's a turn-based multiplayer game running on my own custom backend. But I'm afraid to launch. For some reason, I think it might become something big and that its popularity will kill my poor lonely single server + MySQL database. On one hand I'm thinking that if it's growing, I'd better be prepared and have a scalable infrastructure already in place. On the other hand I just feel like getting it out into the world and see what happens. I often read stuff like "premature optimization is the root of all evil" or people saying that you should just build your killer game now, with the tools at hand, and worry about other stuff like scalability later. I'd love to hear some opinions on this from experts or people with experience with this. Thanks!

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• Web framework able to handle many concurrent users [closed]

  - by Jonas

  Social networking sites needs to handle many concurrent users e.g. for chat functionality. What web frameworks scales well and are able to handle more than 10.000 concurrent users connected with Comet or WebSockets. The server is a Linux VPS with limited memory, e.g. 1GB-8GB. I have been looking for some Java frameworks but they consume much memory per connection. So I'm looking for other alternatives too. Are there any good frameworks that are able to handle more than 10.000 concurrent users with limited memory resources?

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• What are the IEEE and ACM good for?

  - by Joshua Fox

  Membership in the IEEE and ACM is sometimes portrayed as a sign of professionalism. But all that is involved, as far as I can tell, is sending them your money. In return, besides the potential resume line, these organizations sponsor conferences and journals. I can always attend a conference or subscribe to or submit a paper to a journal, whether I am a member or not. If being a member makes some of that cheaper, or is a prerequisite for admission then OK, but I still don't see the purpose of these organizations. The answer, as far as I can gather, is that their most important value is to provide some reading material. I'd suggest that this is not worth the money given the wide availability of other valuable reading materials.

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• What are the advantages and disadvantages of having a subdomain for each user account?

  - by Sathish Manohar

  I notice two types of design used in web applications, some with a particular subdomain for users contents, and some with same URL structure for all the accounts. Ex: unique.domain.com and another_unique.domain.com for subdomains for sites like blogspot, wordpress, basecamp etc. while in the other approach domain.com/action1 and domain.com/action2 the content is shown according to the user logged in, but the URL is same for every user. What are main differences between both of these kind of design?

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• Why fork a library for your own application?

  - by Mr. Shickadance

  Why should a programmer ever fork a library for inclusion in a widely used application? I ask this question because I was reading an article about why Chromium isn't packaged for many Linux distros like Fedora. Apparently its largely due to the fact that Google has forked a number of libraries, modified them, and included them in Chromium. This has driven up the complexity of packaging releases. There are a number of reasons why this can be a bad thing, but how strong a case can you actually make for doing so in a large widely used application such as Chromium? The original article: http://ostatic.com/blog/making-projects-easier-to-package-why-chromium-isnt-in-fedora Isn't it usually worth the effort to make slight modifications to your own program in order to use a popular and well developed library?

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• MonoGame; reliable enough to be accepted on iOS, Win 8 and Android stores?

  - by Serguei Fedorov

  I love XNA; it simplifies rendering code to where I don't have to deal with it, it runs on C# and has very fairly large community and documentation. I would love to be able to use it for games across many platforms. However, I am a little bit concerned about how well it will be met by platform owners; Apple has very tight rules about code base but Android does not. Microsoft's new Windows 8 platforms seems to be pretty lenient but I am not sure oh how they would respond to an XNA project being pushed to the app store (given they suddenly decided to dump it and force developers to use C++/Direct3D). So the bottom line is; is it safe to invest time and energy into a project that runs on MonoGame? In the end, is is possible to see my game on multiple platforms and not be shot down with a useless product?

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• Developing for Windows CE platform?

  - by grmbl

  I'm looking in creating some applications for workers to use on the workfloor. They'll be using Psion NEO devices running Windows CE 5.0. My skillset allows for C#, PHP, ASP.Net (+ webservices). Application requirements: should connect to our ERP system running on IBM iSeries (AS400). should be run in fullscreen (effectively hiding the OS). usability touch functionality. I have tried the following: Full winform application ran through RDP session: [+] easy deployment using .rdp file. [+] application can be run on desktop environment too. [+] rdp host can easily access DB2 using IBM drivers. [+] GUI works ok on small screen. [-] environment = terminal server. (which is already under heavy use) Full winform application running on device OS: [+] environment = local. [+] responsive. [-] must use a webservice to access DB2. [-] deployment... [-] fixed platform (no desktop) Console application running on device OS: [+] environment = local. [+] very responsive. [-] must use a webservice to access DB2. [-] no fullscreen or other window options? [-] deployment... [-] fixed platform (no desktop) I'm considering creating a web application but it seems the OS comes with IE 5? I don't want to alter the OS in any way! (install other browsers etc.) I would like to have an application that's responsive, easy to deploy, fullscreen and optionally multiplatform. I have seen handheld devices using terminal (emulation?) with a console like interface. This seems to be native to the device but I'm afraid this requires modest knowledge of C++? It seems that using RDP is the way to go but, I came here for advice and look for people that have been in the same situation willing to share their experience. There does not seem to be many "best practices" on the web that could help me decide the best way of working. Greetings

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• What is the Best way to learn c# programming and capability to do anything with C#?

  - by MSU

  I browsed all the answers given in Stackoverflow,i couldn't find my answer that's why i am writing this, so please don't mark this a duplicate. My case i want to get the capability of doing anything in C# from building applications to solving problems. I searched for and tried to read books. Then one of the experts said, reading books will not make any good for you, for learning you have to solve problems i.e. real world problems in C#, he gave me some sample problems, which i previously did in C++, i started doing, but the thing is that i know the internal logic of solving the problem or the algorithm to solve. But i don't know how to imepelement them using C# efficiently. so, the gap is, i can't think in C#, I know the message to passed but don't the exact way to pass it. I did a program to solve a problem, then find out there are much easier ways of doing it wherever i was doing it in tougher way. So, can you guys(C# experts) please enlighten me, what i need to get hold of the language and get the ability to code in C# proficiently?

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• How can I download Youtube videos?

  - by Abhijit Navale

  First i tried with youtube-dl and all the times ( and all days) for all videos it gives this same error: youtube-dl http://www.youtube.com/watch?v=6zWwTTAc7O8 [youtube] Setting language [youtube] 6zWwTTAc7O8: Downloading video info webpage [youtube] 6zWwTTAc7O8: Extracting video information ERROR: format not available for video Then I tried minitube latest version. but it just cant open the video. it just keeps trying to open video. it is unable to even play or download any video. Also in old days, whenever i play video in youtube.com that was automatically was saved in my /tmp. But that is also not happening these days. What can I use for downloading Youtube videos? I am using Lucid 64 bit.

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• Extending SSIS with custom Data Flow components (Presentation)

  Download the slides and sample code from my Extending SSIS with custom Data Flow components presentation, first presented at the SQLBits II (The SQL) Community Conference. Abstract Get some real-world insights into developing data flow components for SSIS. This starts with an introduction to the data flow pipeline engine, and explains the real differences between adapters and the three sub-types of transformation. Understanding how the different types of component behave and manage data is key to writing components of your own, and probably should but be required knowledge for anyone building packages at all. Using sample code throughout, I will show you how to write components, as well as highlighting best practice and lessons learned. The sample code includes fully working example projects for source, destination and transformation components. Presentation & Samples (358KB) Extending SSIS with custom Data Flow components.zip

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• Working with Legacy code #3 : Build a safety net.

  - by andrewstopford

  The first port of call in changing legacy code is a safety net, without one your fingers will get burnt. Make your safety net a high level functional test over the major areas of the application. Automate the test, plug it into your CI builds and run it every night. The test should act as a final fail safe as you work.

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• Best practice while marking a bug as resolved with Bugzilla (versioning of product and components)

  - by Vincent B.

  I am wondering what is the best way to handle the situation of marking a bug as resolved and providing a version of component/product in which this fix can be found. Context For a project I am working on, we are using Bugzilla for issue tracking, and we have the following: A product "A" with a version number like vA.B.C.D, This product "A" have the following components: Component "C1" with a version number like vA.B.C.D, Component "C2" with a version number like vA.B.C.D, Component "C3" with a version number like vA.B.C.D. Internally we keep track of which component versions have been used to generate the product A version vA.B.C.D. Example: Product "A" version v1.0.0.0 has been produced from component "C1" v1.0.0.3, component "C2" v1.3.0.0 and component "C3" v2.1.3.5. And Product "A" version v1.0.1.0 has been produced from component "C1" v1.0.0.4, component "C2" v1.3.0.0 and component "C3" v2.1.3.5. Each component is a SVN repository. The person in charge of generating the product "A" have only access to the different components tags folder in SVN, and not the trunk of each component repository. Problem Now the problem is the following, when a bug is found in the product "A", and that the bug is related to Component "C1", the version of product "A" is chosen (e.g. v1.0.0.0), and this version allow the developer to know which version of component "C1" has the bug (here it will be v1.0.0.3). A bug report is created. Now let's say that the developer responsible for component "C1" corrects the bug, then when the bug seems to be fixed and after some test and validation, the developer generates a new tag for component "C1", with the version v1.0.0.4. At this time, the developer of component "C1" needs to update the bug report, but what is the best to do: Mark the bug as resolved/fixed and add a comment saying "This bug has been fixed in the tags v1.0.0.4 of C1 component" ? Keep the bug as assigned, add a comment saying "This bug has been fixed in the tags v1.0.0.4 of C1 component, update this bug status to resolved for the next version of the product that will be generated with the newest version (v1.0.0.4 of C1)" ? Another possible way to deal with this problem. Right now the problem is that when a product component CX is fixed, it is not sure in which future version of the product A it will be included, so it is for me not possible to say in which version of the product it will be solved, but it is possible to say in which version of the Component CX it has been solved. So when do we need to mark a bug as solved, when the product A version include the fixed version of CX, or only when CX component has been fixed ? Thanks for your personal feedback and ideas about this !

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• Would you use UML if it kept stakeholders from requesting changes frequently?

  - by Huperniketes

  As much as programmers hate to document their code/system and draw UML (especially, Sequencing, Activity and State machine diagrams) or other diagramming notation, would you agree to do it if it kept managers from requesting a "minor change" every couple of weeks? IOW, would you put together visual models to document the system if it helped you demonstrate to managers what the effect of changes are and why it takes so long to implement them? (Edited to help programmers understand what type of answer I'm looking for.) 2nd edit: Restating my question again, "Would you be willing to use some diagramming notation, against your better nature as a programmer, if it helped you manage change requests?" This question isn't asking if there might be something wrong with the process. It's a given that there's something wrong with the process. Would you be willing to do more work to improve it?

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