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• Moving from windows to linux

  - by rincewind

  I need to reconcile these 2 facts: I don't feel comfortable working on Linux; I need to develop software for Linux. Some background: I have a 10+ years of programming experience on Windows (almost exclusively C/C++, but some .NET as well), I was a user of FreeBSD at home for about 3 years or so (then had to go back to Windows), and I've never had much luck with Linux. And now I have to develop software for Linux. I need a plan. On Windows, you can get away with just knowing a programming language, an API you're coding against, your IDE (VisualStudio) and some very basic tools for troubleshooting (Depends, ProcessExplorer, DebugView, WinDbg). Everything else comes naturally. On Linux, it's a very different story. How the hell would I know what DLL (sorry, Shared Object) would load, if I link to it from Firefox plugin? What's the Linux equivalent of inserting __asm int 3/DebugBreak() in the source and running the program, and then letting the OS call a debugger? Why the hell release builds use something, called appLoader, while debug builds work somehow different? Worst of all: how to provision Linux development environment? So, taking into account that hatred is usually associated with not knowing enough, what would you recommend? I'm ok with Emacs and GCC. I need to educate myself as a Linux admin/user, and I need to learn proper troubleshooting tools (strace is cool, btw), equivalents to the ones I mentioned above. Do I need to do Linux From Scratch? Or do I need to just read some books (I've read "UNIX programming enviornment" by Kernighan and "Advanced Programming..." by Stevens, but I need to learn something more practical)? Or do I need to have some Linux distro on my home computer?

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• Questions to ask a 3rd party API provider

  - by Jarede

  I'm due to meet with a developer/sales person from a new 3rd party resource we're about to start using. The main topic I'll be interested in, is their API as I will be the developer making use of it and explaining it to the rest of the team. What questions would you recommend asking? Things I'm already thinking about are: What happens and how will I be notified when they depreciate a method? Is there ever any downtime? Who will I deal with first when I have API issues?

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• Design pattern for isomorphic trees

  - by Peregring-lk

  I want to create a data structure to work with isomorphic tree. I don't search for a "algorithms" or methods to check if two or more trees are isomorphic each other. Just to create various trees with the same structure. Example: 2 - - - - - - - 'a' - - - - - - - 3.5 / \ / \ / \ 3 3 'f' 'y' 1.0 3.1 / \ / \ / \ 4 7 'e' 'f' 2.3 7.7 The first "layer" or tree is the "natural tree" (a tree with natural numbers), the second layer is the "character tree" and the third one is the "float tree". The data structure has a method or iterator to traverse the tree and to make diferent operations with its values. These operations could change the value of nodes, but never its structure (first I create the structure and then I configure the tree with its diferent layers). In case of that I add a new node, this would be applied to each layer. Which known design pattern fits with this description or is related with it?

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• Is there a modified LGPL license that allows static linking?

  - by Petr Pudlák

  úLGPL requires that it if a program uses LGPL-ed library, users must be able to re-link the program with a different version of the library: ... d) Do one of the following: 0) Convey the Minimal Corresponding Source under the terms of this License, and the Corresponding Application Code in a form suitable for, and under terms that permit, the user to recombine or relink the Application with a modified version of the Linked Version to produce a modified Combined Work, in the manner specified by section 6 of the GNU GPL for conveying Corresponding Source. 1) Use a suitable shared library mechanism for linking with the Library. A suitable mechanism is one that (a) uses at run time a copy of the Library already present on the user's computer system, and (b) will operate properly with a modified version of the Library that is interface-compatible with the Linked Version. ... However in some cases, this can pose considerable difficulties. In particular, Haskell programs are almost always statically compiled. Moreover, the compiler does cross-module optimizations so it's very hard to satisfy this condition. (See this link at Haskell Wiki.) Therefore, I'm looking for a standard LGPL-like license that wouldn't require the possibility of re-linking. Some projects use their own modification of LGPL, for example wxWidgets. But I'd rather use some standard license that is somewhat more official, perhaps checked by some law experts, and (L)GPL compatible. Is there some like that? (Also I'd be interested to know if are there some unforeseen consequences of such a modification of LGPL.)

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• Single IBAction for multiple UIButtons versus single IBAction for single UIButton

  - by Miraaj

  While using story-board there are two different approaches which my team mates follow: Approach 1: To bind unique action with each button, ie: Done button - binded to - doneButtonAction Cancel button - binded to - cancelButtonAction OR Approach 2: To bind single action to multiple buttons, ie: Done button - binded to - commonButtonAction Cancel button - binded to - commonButtonAction Then in commonButtonAction they prefer to use switch case like this: - (IBAction)commonButtonAction:(id)sender { UIButton *button = (UIButton *)sender; switch (button.tag) { case 201: // done button [self doneButtonAction:sender]; break; case 202: // cancel button [self cancelButtonAction:sender]; break; default: break; } } - (void)cancelButtonAction:(id)sender { // no interesting stuff, simple dismiss of view :-( } - (void)doneButtonAction:(id)sender { // some interesting stuff ;-) } Reasoning which they give to follow approach 2 is - in each view controller during code walk through anyone can easily identify where to find code related to button actions. While others discard this idea because they say that adding an extra switch case is unnecessary and is not a common practice. What are your views?

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• Purchasing Visual Studio 2010 Ultimate and Professional version

  - by Don

  We are a small team with 5-7 developers. We are planning to purchase Visual Studio 2010, better with one or two Ultimate version, others with professional version. The suggestion from Microsoft is getting it from retail. We find we can get them from http://msdn.microsoft.com/en-us/subscriptions/buy.aspx or http://www.amazon.com/Visual-Studio-2010-Ultimate-MSDN/dp/B0038KNER0/ref=sr_1_fkmr3_2?ie=UTF8&qid=1296675635&sr=8-2-fkmr3. From Amazon, it will be lower cost. We wonder if we buy from Microsft directly we can get additional benefits like supports, which other retailers can not provide. Anyone has any ideas? What is the cost effient way? Thanks,

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• How do you think about an Application Generator? [closed]

  - by Mehdi Sheyda

  I'm designing an application-generating application. It is an application that takes the requirements of customer as inputs , analyzes the requirements, creates classes and produces program files in C#. I am at the beginning of this project and have a long way to go with this application. Do you have an experience with designing similar kinds of projects? What risks might I encounter with this project?

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• Outsourcing a private project: can it be done?

  - by Stafford Williams

  I'm an employed software designer/developer/analyst/monkey and I'm pondering the possibility of outsourcing the coding component(s) of some private(ly funded) projects. I have never used outsourcing before and am hesitant due to the contractors i've seen in the workplace that seem to have a reverse relationship on renumeration vs results/quality. Has anyone had any luck with outsourcing private coding jobs and can you offer any pointers?

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• Handling Errors In PHP When Using MVC

  - by James Jeffery

  I've been using Codeigniter a lot recently, but one thing that gets on my nerves is handling errors and displaying them to the user. I've never been good at handling errors without it getting messy. My main concern is when returning errors to the user. Is it good practice to use exceptions and throw/catch exceptions rather than returning 0 or 1 from functions and then using if/else to handle the errors. Thus, making it easier to inform the user about the issue. I tend to go away from exceptions. My Java tutor at university some years ago told me "exceptions shouldn't be used in production code it's more for debugging". I get the feeling he was lying. But, an example, I have code that adds a user to a database. During the process more than 1 thing could go wrong, such as a database issue, a duplicate entry, a server issue, etc. When an issue happens during registration the user needs to know about it. What's the best way to handle errors in PHP, keeping in mind that I'm using an MVC framework.

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• Resources for improving your comprehension of recursion?

  - by Andrew M

  I know what recursion is (when a patten reoccurs within itself, typically a function that calls itself on one of its lines, after a breakout conditional... right?), and I can understand recursive functions if I study them closely. My problem is, when I see new examples, I'm always initially confused. If I see a loop, or a mapping, zipping, nesting, polymorphic calling, and so on, I know what's going just by looking at it. When I see recursive code, my thought process is usually 'wtf is this?' followed by 'oh it's recursive' followed by 'I guess it must work, if they say it does.' So do you have any tips/plans/resources for building up your skills in this area? Recursion is kind of a wierd concept so I'm thinking the way to tackle it may be equally wierd and inobvious.

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• Handling permissions in a MVP application

  - by Chathuranga

  In a windows forms payroll application employing MVP pattern (for a small scale client) I'm planing user permission handling as follows (permission based) as basically its implementation should be less complicated and straight forward. NOTE : System could be simultaneously used by few users (maximum 3) and the database is at the server side. This is my UserModel. Each user has a list of permissions given for them. class User { string UserID { get; set; } string Name { get; set; } string NIC {get;set;} string Designation { get; set; } string PassWord { get; set; } List <string> PermissionList = new List<string>(); bool status { get; set; } DateTime EnteredDate { get; set; } } When user login to the system it will keep the current user in memory. For example in BankAccountDetailEntering view I control the controller permission as follows. public partial class BankAccountDetailEntering : Form { bool AccountEditable {get; set;} private void BankAccountDetailEntering_Load(object sender, EventArgs e) { cmdEditAccount.enabled = false; OnLoadForm (sender, e); // Event fires... If (AccountEditable ) { cmdEditAccount.enabled=true; } } } In this purpose my all relevant presenters (like BankAccountDetailPresenter) should aware of UserModel as well in addition to the corresponding business Model it is presenting to the View. class BankAccountDetailPresenter { BankAccountDetailEntering _View; BankAccount _Model; User _UserModel; DataService _DataService; BankAccountDetailPresenter( BankAccountDetailEntering view, BankAccount model, User userModel, DataService dataService ) { _View=view; _Model = model; _UserModel = userModel; _DataService = dataService; WireUpEvents(); } private void WireUpEvents() { _View.OnLoadForm += new EventHandler(_View_OnLoadForm); } private void _View_OnLoadForm(Object sender, EventArgs e) { foreach(string s in _UserModel.PermissionList) { If( s =="CanEditAccount") { _View.AccountEditable =true; return; } } } public Show() { _View.ShowDialog(); } } So I'm handling the user permissions in the presenter iterating through the list. Should this be performed in the Presenter or View? Any other more promising ways to do this? Thanks.

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• What resources do you recommend for learning more about TCP/IP, networking, and related areas?

  - by mkelley33

  As a relatively-new Python programmer, I'm finding more and more that networking as it relates to the web and web development is becoming increasingly important to understand. When I was an active C# ASP.NET programmer making smaller websites with less responsibility this knowledge seemed less important, since there was often a "networking" guy performing any tasks beyond acquiring a domain name for a client. Which books, websites, presentations, articles, or other resources would you recommend so that I best understand what's happening between the time a user types a URL and receives the rendered HTML? Thanks!

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• Scientific evidence that supports using long variable names instead of abbreviations?

  - by Sebastian Dietz

  Is there any scientific evidence that the human brain can read and understand fully written variable names better/faster than abbreviated ones? Like PersistenceManager persistenceManager; in contrast to PersistenceManager pm; I have the impression that I get a better grasp of code that does not use abbreviations, even if the abbreviations would have been commonly used throughout the codebase. Can this individual feeling be backed up by any studies?

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• How to be a responsible early adopter?

  - by Gaurav

  A disconcertingly high number of new technologies/paradigms are overhyped (as is evident from replies to this question). Combine this with the fact that being early adopter is inherently risky. This makes evaluation of technology before adoption critical. So how exactly early adopters among you go about it. I can think of following general criteria. For early adoption technology must address previously unaddressed issue and/or For acceptance beyond early adoption technology should address performance One indicator that something is not right is when there is too much of jargon for technology which is either irrelevant or there is no evidence to back it up What is your opinion. Update: 4. BTW, the biggest reason to fear technology is when it is imposed by the tech-unaware management based entirely on number of buzzwords.

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• Retrieving system information without WMI

  - by user94481

  I want to write an application where I can fetch system information like CPU-Z (for example) does. I don't want to rely on WMI, because I want to grab stuff like information about the manufacturing process of the GPU (like from a database) and I don't want to maintain this by myself, because that would require too much effort. I already came up with HWiNFO32 SDK but I wonder if there are any (maybe free) alternatives to it?

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• Softpedia published some of my open source projects — how to react?

  - by polarblau

  (FYI: I've just moved this question over from Stackoverflow on recommendation.) I just received a few emails, informing me that softpedia.com has added some of my "products" to their "database of scripts, code snippets and web applications". My products are in this case some smaller open source projects, which I have hosted and published on github. Now I'm wondering how to react to this. This site is indirectly making money of my free work through ads on three pages before the actual download. They also seem to "invent" version numbers and I can't find out if they're hosting the latest or all versions of my projects. — I can see how this could lead to problems in the future, since I don't control what's "the latest" everywhere. On the other hand I don't mind some extra publicity. I want as many people as possible to know about the projects, use them, fork them and hopefully improve them. The projects in questions are really fairly small, but this might not be the case in the future for me and/or other people reading this question. I'm sure that this must have happened to others around here. What's your opinion? Should I try to get the downloads removed? Update 1 I've requested the removal and mentioned that I don't feel that Softpedia can provide the right environment for this kind of project. Their team got back to me instantly with a friendly email saying, that they'll remove the links for now: If you are worried that your projects won't be updated, then I must tell you that I have them bookmarked in my RSS reader, so any version changes will be forwarded to me when needed. So I promise I'll keep your script up to date as soon as I see an update in the repository. I have to say, that I appreciate this kind of reaction quite a lot and so I sent them another email, describing in more detail what I'm worried about and what bothers me. I also stated, that I'm aware that my license clearly permits them to host the projects in any case, but that I'd be even happy if they would host the projects as long as they could convince me of a few details and maybe make some small changes to the way the projects are represented. — Let's see where this goes. Update 2 After discussing with their contact and requesting some changes regarding display of version (they had given the possibility to do so) and authorship they put the projects back up on their site. All in all a positive and definitely interesting experience.

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• Ashamed to admit using jQuery?

  - by Matt Stevens

  Something I've noticed over the past few weeks is how many big commercial websites use jQuery combined with lots of plugins - but don't admit it. They will rename the main library to something obscure, as well as the plugins. Quite a few will even remove the comments that contain the MIT/GPL license information. (just noticed today that odeon.co.uk have done exactly this) Why are they doing this? are they abashed by the face that they are using a free and open source library?

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• tail-like view on HTML logfiles

  - by h0b0

  I'm working on an application that creates HTML log files. I'm tired of having to manually reload and scroll to the bottom in the browser to see the latest entries. A solution that does not really satisfy me is using the Firefox plugins ReloadEvery and ScrollyFox. In many situations reloading frequency and scrolling speed are just to slow. Of course I could actually use tail, but I would prefer a rendered HTML page. Do you have any suggestions? Firefox extensions are preferred, but any other tip is appreciated, too.

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• Would learning any (linguistic) language in particular further your programming career?

  - by Anonymous

  It seems apparent that English is the dominant international language for programming based on previous P.SE questions (though a highly upvoted comment correctly points out that asking a question like that on a predominantly English site will skew the results). However, is there benefit in learning a foreign language for software development? For example, do the Chinese have completely different software tools, languages, technologies, etc? How about Japanese, Russian, and other non-latin based languages? Is there an entire world of software development languages, tools and so on that only exist in these other languages? Or do people that know these languages use the tools and languages we know and love?

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• Keyboard "type ahead" in CRUD web apps?

  - by user61852

  In some data entry contexts, I've seen data typists, type really fast and know so well the app they use, and have a mechanic quality in their work so that they can "type ahead", ie continue typing and "tab-bing" and "enter-ing" faster than the display updates, so that in many occasions they are typing in the data for the next form before it draws itself. Then when this next entry form appears, their keystrokes fill the text boxes and they continue typing, selecting etc. In contexts like this, this speed is desirable, since this persons are really productive. I think this "type ahead of time" is only possible in desktop apps, but I may be wrong. My question is whether this way of handling the keyboard buffer (which in desktop apps require no extra programming) is achievable in web apps, or is this impossible because of the way web apps work, handle sessions, etc (network latency and the overhead of generating new web pages ) ?

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• Contracting rate for Android development

  - by Robottinosino

  I am a developer, maybe I have a project to work on, not sure how much to "charge" for my work.... Help me find the price? Looking for an contracting rate interval, expressed in EUR, to offer for an Android development gig. Location: Europe, off-site (telecommuting) Environment: Android + HTTP back-end Length of project: 1 month Rate currency: EUR Rate measure: daily or hourly Other skills required: UI design, basic J2EE, web services Client profile: medium business (100+ employees) Previous published apps: 1, on G-Play Design work: partially already done, data flow is established, data models to be built Required graphics/multimedia elements: provided by the client Source control: remove over SSH Team size: one person in development, others (unknown) for marketing, copy, etc. Risk factor: medium Client reputation: modest but established Potential for continued work: absent (for now) Internationalisation/localisation: no Native code (C/C++,...): none, only Android SDK, pure Java Working culture: (based on initial discussion) - high pressure Other projects in the pipe: zero Opportunity to learn from the project or build new skills: 5% Negotiating experience: good Cost of accessories: (licenses, device to debug on) zero If I need to be more precise, please just say how and I will be.

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• Successful technical communities except for open-source?

  - by Joshua Fox

  Have you ever seen a successful technical community -- e.g. user group, industry organization? Am I asking about a group of software engineers who get together F2F (or maybe online) and discuss technical and industry issues with deep zeal and interest -- a place where meaningful connections are made. Here are the only examples I have ever seen: Open source Maybe the Silicon Valley Java Users' Group Homebrew Computing Club in the '70's This sort of thing does exist in academia. Of course, there are lots of conferences and attempts at user's groups. However, almost all committed, serious software engineers, when asked about this, say "I don't have the time", which means that the organizations are not worthwhile to the best in our profession. Has anyone seen any organizations with an ongoing spirit of enthusiasm from top software engineers?

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• Learning to be a good developer: what parts can you skip over?

  - by Andrew M

  I have set myself the goal of becoming a decent developer by this time next year. By this I mean full experience of the development 'lifecycle,' a few good apps/sites/webapps under my belt, and most importantly being able to work at a steady pace without getting sidelined for hours by some should-know-this-already technique. I'm not starting from scratch. I've written a lot of html/css, SQL, javascript, python and VB.net, and studied other languages like C and Java. I know about things like OOP, design patterns, TDD, complexity, computational linguistics, pointers/references, functional programming, and other academic/theoretical matters. It's just I can't say I've really done these things yet. So I want to get up to speed, and I want to know what things I can leave till a later date. For instance, studying algorithms and the maths behind them is interesting and all, but so far I've hardly needed to write anything but the most basic nested loops. Investigating Assembly to have a clearer picture of low-level operations would be cool... but I imagine rarely infringes on daily work. On the other hand, looking at a functional programming language might help me write programs that are more comprehensible and less prone to hidden failures (at the moment I'm finding the biggest difficulty is when the complexity of the app exceeds my capacity to understand it - for instance passing data around was fine... until I had to start doing it with AJAX, which was a painful step up). I could spend time working through case studies of design patterns, but I'm not sure how many of them get used in 'real life.' I'm a programmer with basic abilities - what skills should I focus on developing? (also my Unix skills are very weak, and also knowledge of Windows configuration... not sure how much time I should spend on that)

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• Career paths after web development?

  - by Mike

  I know this is open ended, but I'm just curious what you've done after your web development career, or if you've stayed loyal. I have a feeling/read/heard that web development salaries top out at a certain amount.. even after 10-15 years of experience. Reason I ask is that I graduated last summer with a BS in Chemical Engineering.. but have not been able to find a job in California. I've been web designing/developing since high school and thought that I should start a career, even if its not related to my major and not lose more time. Even though I'd really like to have an engineering career, I don't think that will happen. Do you guys have any suggestions or experiences for choices after/ways to enhance your career after several years in web development? Thanks! Update: Thanks for the responses guys! One more question: Is it likely to be accepted into a MS/PhD program if you've been out of uni for a couple years? Or with semi-related job experience? Would I be a bit of a misfit with a BS in ChemE studying CS/CompE for an MS?

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• Optimizing MySQL -

  - by Josh

  I've been researching how to optimize MySQL a bit, but I still have a few questions. MySQL Primer Results http://pastie.org/private/lzjukl8wacxfjbjhge6vw Based on this, the first problem seems to be that the max_connections limit is too low. I had a similar problem with Apache initially, the max connection limit was set to 100, and the web server would frequently lock up and take an excruciatingly long time to deliver pages. Raising the connection limit to 512 fixed this issue, and I read that raising the connection limit on MySQL to match this was considered good practice. Being that MySQL has actually been "locking up" recently as well (connections have been refused entirely for a few minutes at a time at random intervals) I'm assuming this is the main cause of the issue. However, as far as table cache goes, I'm not sure what I should set this as. I've read that setting this too high can hinder performance further, so should I raise this to right around 551, 560, 600, or do something else? Lastly, as far as raising the join_buffer_size value goes, this doesn't even seem to be included in Debian's my.cnf file by default. Assuming there's not much I can do about adding indexes, should I look into raising this? Any suggested values? Any suggestions in general here would be appreciated as well. Edit: Here's the number of open tables the MySQL server is reporting. I believe this value is related to my question (Opened_tables: 22574)

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