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• What is the single most effective thing you did to improve your programming skills?

  - by Oded

  Looking back at my career and life as a programmer, there were plenty of different ways I improved my programming skills - reading code, writing code, reading books, listening to podcasts, watching screencasts and more. My question is: What is the most effective thing you have done that improved your programming skills? What would you recommend to others that want to improve? I do expect varied answers here and no single "one size fits all" answer - I would like to know what worked for different people. Edit: Wow - what great answers! Keep 'em coming people!!!

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• How does memory management in Java and C# differ?

  - by David Johnstone

  I was reading through 2010 CWE/SANS Top 25 Most Dangerous Programming Errors and one of the entries is for Buffer Copy without Checking Size of Input. It suggests using a language with features to prevent or mitigate this problem, and says: For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. I was not aware that Java and C# differed in any meaningful way with regard to memory management. How is it that Java is not subject to buffer overflows, while C# only protects against overflows? And how is it possible to disable this protection in C#?

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• Self Assesstment Tests for Programmers

  - by THX1138.6

  I want to help the Dev team identify areas of knowledge (practical and theoretical) that they can work on. Though I am big believer in focusing on people's strengths being a good programmer requires (I think) being challenged by concepts and ideas that don't always come naturally. We work largely in the web app space using PHP & MySQL but better skills in data modelling, query optimisation, use of MVC and OOP etc. would help the team and the company a lot. I want to help the Dev team manage their careers, explore and expand their skills sets. Be all they can be and better than they were previously. I know its an idealistic goal but work must be about more than simply getting the work done. There should be some time to review, to learn, to grow and get better. Any thoughts, ideas, opinions and directions to tests or similar resources would be greatly appreciated.

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• Python: How do I create a reference to a reference?

  - by KCArpe

  Hi, I am traditionally a Perl and C++ programmer, so apologies in advance if I am misunderstanding something trivial about Python! I would like to create a reference to a reference. Huh? Ok. All objects in Python are actually references to the real object. So, how do I create a reference to this reference? Why do I need/want this? I am overriding sys.stdout and sys.stderr to create a logging library. I would like a (second-level) reference to sys.stdout. If I could create a reference to a reference, then I could create a generic logger class where the init function receives a reference to a file handle reference that will be overrided, e.g., sys.stdout or sys.stderr. Currently, I must hard-code both values. Cheers, Kevin

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• Connect Chrome to TOR

  - by Jack M

  I'm having difficulty connecting Chrome to TOR. I started trying yesterday. I started Vidalia and the TOR Browser and then followed the advice at http://lifehacker.com/5614732/create-a-tor-button-in-chrome-for-on+demand-anonymous-browsing - downloading Proxy Switchy and setting it up as stated. This resulted in Error 130 (net::ERR_PROXY_CONNECTION_FAILED) (in Chrome, when I tried to load a webpage). So I looked into Vidalia's settings and noticed that it appeared to be using port 9051, so I set that instead of 8118 as everyone on the internet seems to be suggesting. Then I got a new error: Error 111 (net::ERR_TUNNEL_CONNECTION_FAILED). Digging a bit, I found that Tor should be set as a SOCKS proxy, not an HTTP proxy, so I unticked "use same settings for all protocols" in Proxy Switchy and just set localhost:9051 for SOCKS. That got me Error 7 (net::ERR_TIMED_OUT). And that's when I came here for help. I typed up the above question, but then at the last minute decided to do a bit more reading and found someone here suggested using some command line arguments via a Windows shortcut: "C:\snip\chrome.exe" --proxy-server=";socks=127.0.0.1:9051;sock4=127.0.0.1:9051;sock5=127.0.0.1:9051" --incognito check.torproject.org And that worked perfectly. Yesterday. Today it doesn't, so I'm having to post this question after all. check.torproject.org gives me a "no" with Chrome, but a "yes" with the default Tor Browser. I tried closing Chrome and restarting it (yes, with the correct shortcut) after Vidalia started, but still nothing. The port number hasn't changed or anything. What gives? EDIT: I realized I had a "non tor" instance of Chrome running and that possibly the was causing the command line args t be ignored when I started the new instance. Closed all instances of chrome and ran my Chrome Tor shortcut, and it did get rid of the "not using Tor" message -- because I got another Time Out error instead. Vidalia's bandwidth graph didn't even blink.

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• Questions every good Java/J2EE Developer should be able to answer?

  - by Rachel

  I was going through Questions every good .Net developer should be able to answer and was highly impressed with the content and approach of this question, and so in the same spirit, I am asking this question for Java/J2EE Developer. What questions do you think should a good Java/J2EE programmer be able to answer? I am marking this question as community wiki as it is not user specific and it aims to serve programming community at large. Looking forward for some amazing responses. EDIT: Please answer questions too, as suggested in the comments, so that people could learn something new regarding the language, too.

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• Why use Oracle Application Express for web app?

  - by Jack

  Hi all. I believe we're moving to Oracle Apex for future development. I've read about Oracle Apex on wikipedia and it's pro and con. It seem to me the con outweigh the pro but maybe I'm wrong. I get the sense that Oracle Apex is for DBA with little or no programing knowledge to setup a web app quickly sort like MS Access for none programmer. If you have Oracle Apex working experience, can you share your though? From wikipedia's entry, it doesn't seem like you need to know any programming language at all but just the PL/SQL? edit: Is Oracle Apex scalable? Can it handle traffic like Facebook's size? Thank. Jack

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• Looking for design/architecture suggestions for a simple HTML game.

  - by z-boss

  Imagine that HTML page is a game surface (see picture). User can have n number of boards (blue divs) on his page. Each board can be moved, re-sized, relabeled, created new and removed. Inside each board there are m number of figures (purple divs). Each of these user can move inside the board or to another board, re-size, change color and label, delete, add new. The goal of the game is not important, but let's say it is to rearrange figures in a certain way so that they disappear. But the goal of the programmer is to save the whole game surface in the database for every user of the site, and to load it later when he returns. So, how do I go about data exchange between client and the database? I'll give my idea in one of the answers.

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• Programming related name for a kitten? [closed]

  - by andrhamm

  I am a programmer and I just got my first kitten. A Google search for nerdy/geeky cat names was unimpressive. She's a little black kitten with a very courageous and adventurous attitude! She has a little light gray spot on her chest which might turn white with time. Here she is on my Flickr Which name would you suggest? Which of these do you like? It should be something short that has a couple contrasting sounds so it stands out a bit when you say it. PHP is my favorite scripting language but it makes for a lousy name :P Java Pixel Perl Ruby Gizmo Mocha Thanks for the help!

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• Mouse configurable buttons for programming

  - by DavRob60

  Different mouse models has been already discussed. But all these mouse got configurable buttons. Has a programmer, how do you set them? I use The Microsoft Intellimouse Optical. So set the Left side button to "Copy" and the Right side button to "Paste". I did not set the Wheel click to anything. I'm curious to see if there is any better setup? UPDATE : I'm trying to find some interesting key I could map to my mouse buttons. Copy & paste are the best I' found so far, but i just want to know if there is something that could be more useful when programming.

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• How beneficial is this subject combination for an undergrad CS student?

  - by Maxood

  I'm an undergrad Computer Science student and studying online. There is a lot of self study, independent research and practice i have to do myself. I wonder how beneficial would it be to choose this subject combination in programming: Data Structures OOP Assembly Language & Computer Architecture Although i also have the option to take DLD (Digital Logic Design) or Data communication courses instead of Assembly Language. My interest lies in programming and i'm also working as a programmer at local software house. Can anyone give me some good advice and suggestions.

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• code to edit the text in an EditText widgit

  - by user293663

  Hello, I am a newbi programmer and am having trouble with a measurement conversion program I am working on. What I would like to do is have several EditText boxes. When one is filled in and a calculate button is hit then the rest will be populated with a converted number. The part I am getting stuck on is outputting the answers to EditText widgets. ex: There are three EditText Widgets. a user inputs the number 6 into the first one (labeled inches) and presses calculate. I would like the next box to display .5 (labeled feet) and the last to display .1666 (this would be yards) .setText() apparently does not work to modify the text in an EditText any help would be greatly appreciated.

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• IIS 6 302, 401 Error

  - by lvandiest

  I'm having some problems accessing an ASP.NET website hosted on an internal iis 6 server that I am maintaining. Some users can get to the site, others (including myself can't). The app has Windows Authentication mode set in the web.config file, and Integrated Windows Authentication checked in the Website properties. Anonymous access is not checked. In the IIS logs, I see 2 lines when I make a request for the site's default page (Default.aspx). The first is a 401.2 error, and the 2nd is a 302.0 error. I've tried switching around as many security settings as I can think of, but had no luck yet. Can someone please help? I'm mainly a programmer, but have done a little IIS administration, so it is probably something quite simple I am missing. -- here are the log entries for my request to Default.aspx 2011-01-11 21:17:35 10.100.1.6 GET /MonthEndInventory/Default.aspx - 80 - 10.100.1.111 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+6.1;+Trident/4.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+Media+Center+PC+6.0;+OfficeLiveConnector.1.4;+OfficeLivePatch.1.3;+.NET+CLR+1.1.4322;+Tablet+PC+2.0;+.NET4.0C;+.NET4.0E;+InfoPath.3;+MS-RTC+LM+8) 401 2 2148074254 2011-01-11 21:17:35 10.100.1.6 GET /MonthEndInventory/Default.aspx - 80 DOMAIN\myuserid 10.100.1.111 Mozilla/4.0+(compatible;+MSIE+7.0;+Windows+NT+6.1;+Trident/4.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+Media+Center+PC+6.0;+OfficeLiveConnector.1.4;+OfficeLivePatch.1.3;+.NET+CLR+1.1.4322;+Tablet+PC+2.0;+.NET4.0C;+.NET4.0E;+InfoPath.3;+MS-RTC+LM+8) 302 0 0

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• What are some of the practical cons to using ASMX webservices?

  - by Earlz

  Hello, at my workplace we are about to start a big project. My boss (a programmer, this is a startup) wishes to use ASMX webservices for this purpose. I do not want to start off a new program using deprecated technology and would like to show him this. I dislike WCF at this moment because it has such an extreme learning curve, but I'd rather learn it than use an unsupported technology. The problem I'm having is that I can not find any practical list of cons and downfalls when compared to WCF so that I can convince my boss to not use them. And saying "it's not as powerful" is not an adequate explanation. What exactly can it not do that we may need it to do for a webservice that is not meant to be shared externally? (as in, we don't support third-parties using our webservices unless they are using one of our clients. )

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• How do you protect code from leaking outside?

  - by cubex

  Besides open-sourcing your project and legislation, are there ways to prevent, or at least minimize the damages of code leaking outside your company/group? We obviously can't block Internet access (to prevent emailing the code) because programmer's need their references. We also can't block peripheral devices (USB, Firewire, etc.) The code matters most when it has some proprietary algorithms and in-house developed knowledge (as opposed to regular routine code to draw GUIs, connect to databases, etc.), but some applications (like accounting software and CRMs) are just that: complex collections of routine code that are simple to develop in principle, but will take years to write from scratch. This is where leaked code will come in handy to competitors. As far as I see it, preventing leakage relies almost entirely on human process. What do you think? What precautions and measures are you taking? And has code leakage affected you before?

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• iPhone development time...

  - by Tisch

  I have been asked to develop a relatively simple iPhone application. However, it would be my first application. I am a fairly competent programmer and can turn my skills to a new language fairly quickly... what my question is, is... How long has it taken some of you guys to make your first iPhone application and what was your experience like? Also, if you can say this sort of information, how much did you charge for it?! Thanks in advance. Kindest Regards Tom

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• How can I learn the math necessary for working with computer vision?

  - by Duncan Benoit

  I know that computer vision involves a lot of math, but I need some tips about how programmers gain that knowledge. I've started to use the OpenCV library but I have some major problems in understanding how the math works in the algorithms. In college I have studied some math and we worked with matrices and derivatives, but I didn't pay to much attention to the subject. It seemed to be so difficult and useless from a programmer point of view. I suppose that there has to be some easy way to understand what a second derivative is without calculating an equation. (Derivatives are just an example) Do you have any tips for me about how can i gain such knowledge? A forum, book, link, advice, anything?

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• Delphi Compiler Directive to Evaluate Arguments in Reverse

  - by Peter Turner

  I was really impressed with this delphi two liner using the IFThen function from Math.pas. However, it evaluates the DB.ReturnFieldI first, which is unfortunate because I need to call DB.first to get the first record. DB.RunQuery('select awesomedata1 from awesometable where awesometableid = "great"'); result := IfThen(DB.First = 0, DB.ReturnFieldI('awesomedata1')); Obviously this isn't such a big deal, as I could make it work with five robust liners. But all I need for this to work is for Delphi to evaluate DB.first first and DB.ReturnFieldI second. I don't want to change math.pas and I don't think this warrants me making a overloaded ifthen because there's like 16 ifthen functions. Just let me know what the compiler directive is, if there is an even better way to do this, or if there is no way to do this and anyone whose procedure is to call db.first and blindly retrieve the first thing he finds is not a real programmer.

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• Error when trying to use PDO object

  - by Nate

  EDIT: I'm going to put my code in here due to comments below. So sit tight for a few minutes ;-) Thanks! I'm an inexperienced php programmer and only found out about PDO a few days ago. I'm now trying to port my website code over to using PDO, but I am getting an error when I try to use the PDO object that I create. I'm using a CMS on my website, and it makes building page output kind of complicated, but I've tried to draw the structure of what is being called below: index.php -class myClass defined --method myFunction defined (it gets called on pageload & returns the page output) ---include file1.php ----require_once('mysql_connect.php') (creates pdo object) ----*I can use the pdo object here successfully* ----require_once('file2.php') -----require_once('mysql_connect.php') -----function myFunction2 defined ------*trying to use the pdo object here results in the error* The error I'm getting is: Fatal error: Call to a member function prepare() on a non-object in /home/rgcpanel/public_html/account/account_functions.php on line 147 Any idea what's going on?

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• nginx and proxy_hide_header

  - by giskard

  When I curl for a URL I get this answer back: > < HTTP/1.1 200 OK < Server: nginx/0.7.65 < Date: Thu, 04 Mar 2010 12:18:27 GMT < Content-Type: application/json < Connection: close < Expires: Thu, 04 Mar 2010 12:18:27 UTC < http.context.path: /1/ < jersey.response: com.sun.jersey.spi.container.ContainerResponse@17646d60 < http.custom.headers: {Content-Type=text/plain} < http.request.path: /2/messages/latest.json < http.status: 200 < Transfer-Encoding: chunked I want to remove < http.context.path: /1/ < jersey.response: com.sun.jersey.spi.container.ContainerResponse@17646d60 < http.custom.headers: {Content-Type=text/plain} < http.request.path: /2/messages/latest.json < http.status: 200 So I used the proxy_hide_header directive in this way: location / { if ($arg_id) { proxy_pass http..authorized; break; } proxy_pass http..anonymous; proxy_hide_header http.context.path; proxy_hide_header jersey.response; proxy_hide_header http.request.path; proxy_hide_header http.status ; } But it doesn't work. any clues?

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• Why would it be a bad idea to have database connection open between client requests?

  - by AspOnMyNet

  1) Book I’m reading argues that connections shouldn’t be opened between client requests, since they are a finite resource. I realize that max pool size can quickly be reached and thus any further attempts to open a connection will be queued until connection becomes available and for that reason it would be imperative that we release connection as soon as possible. But assuming all request will open connection to the same DB, then I’m not sure how having a connection open between two client requests would be any less efficient than having each request first acquiring a connection from connection pool and later returning that object to connection pool? 2) Book also recommends that when database code is encapsulated in a dedicated data access class, then method M opening a database connection should also close that connection. a) I assume one reason why M should also close it, is because if method M opening the connection doesn’t also close it, but instead this connection object is used inside several methods, then it’s more likely that a programmer will forget to close it. b) Are there any other reasons why a method opening the connection should also close it? thanx

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• Is it really wrong to version documents using CouchDB's default behaviour?

  - by Tomas Sedovic

  This is one of those "I know I shouldn't do this but it's oh so convenient." questions. Sorry about that. I plan to use CouchDB for storing a bunch of documents and keeping their entire revision history. CouchDB does the versioning automatically, but it is strongly discouraged for programmer's use: "You cannot rely on document revisions for any other purpose than concurrency control." From what I've found on the CouchDB wiki, the versions can get deleted either during compaction or during replication. As far as I can tell, Compaction must always be triggered manually and Replication occurs only when there's more than one database server. The question is: if I won't run compaction and will use only single database instance for my documents, can I just use CouchDB's document versioning and expect it to work? What other problems I might run into? E.g. does not running compaction hurt the performance or consume significantly more disk space (than if I did handle the versioning manually)?

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• How to move your Windows User Profile to another drive in Windows 8

  - by Mark

  I like to have my user folder on a different drive (D:) than my OS is (C:). Reading the following post I decided to give it a try. All went quite well, untill I found out that my Windows 8 Apps won't execute anymore (other than that I didn't noticed any problems). My apps do work, while using an account that isn't moved. In the eventviewer I've found error messages like these: App <Microsoft.MicrosoftSkyDrive> crashed with an unhandled Javascript exception. App details are as follows: Display Name:<SkyDrive>, AppUserModelId: <microsoft.microsoftskydrive_8wekyb3d8bbwe!Microsoft.MicrosoftSkyDrive> Package Identity:<microsoft.microsoftskydrive_16.4.4204.712_x64__8wekyb3d8bbwe> PID:<4452>. The details of the JavaScript exception are as follows Exception Name:<WinRT error>, Description:<Loading the state store failed. > , HTML Document Path:</modernskydrive/product/skydrive/App.html>, Source File Name:<ms-appx://microsoft.microsoftskydrive/jx/jx.js>, Source Line Number:<1>, Source Column Number:<27246>, and Stack Trace: ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:27246 localSettings() ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:51544 _initSettings() ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:54710 getApplicationStatus(boolean) ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:48180 init(object) ms-appx://microsoft.microsoftskydrive/jx/jx.js:1:45583 Application(number, boolean) ms-appx://microsoft.microsoftskydrive/modernskydrive/product/skydrive/App.html:216:13 Anonymous function(object) Using ProcMon, I see a lot of access denied messages, like these: Date & Time: 12-9-2012 9:32:20 Event Class: File System Operation: CreateFile Result: ACCESS DENIED Path: D:\Users\John\AppData\Local\Packages\microsoft.microsoftskydrive_8wekyb3d8bbwe\Settings\settings.dat TID: 2520 Duration: 0.0000149 Desired Access: Read Data/List Directory, Write Data/Add File, Read Control Disposition: OpenIf Options: Sequential Access, Synchronous IO Non-Alert, No Compression Attributes: N ShareMode: None AllocationSize: 0 Any idea how to solve this? I noticed that the app folders e.g.: D:\Users\john\AppData\Local\Packages\microsoft.microsoftskydrive_8wekyb3d8bbwe had a different owner than the old profile folder had. Old profile folder had john as owner where my new profile folder had the Administrators group as owner. Changing this didn't help unfortunately.

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• I would like to build a Java Web Application. What's the quickest start?

  - by Vish

  I am a reasonably competent programmer, with about 11 years experience. I particularly like Ruby/Rails and ActionScript. And Java is not too hard. I'd like to develop a web application in Java in order to leverage things like BlazeDS and learn some new tricks with regard to JBoss and the whole Java App thing. But I'm having trouble - and confused - looking for a smooth start. I don't want to use Grails, thanks, I want to use Pure Java, with whatever Framework you can think of. Spring, Hibernate, lalala, it's cool. Where do I start?

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• What are people's opinions vis-a-vis my choice of authorization plugins?

  - by brad

  I'm slowly but surely putting together my first rails app (first web-app of any kind in fact - I'm not really a programmer) and it's time to set up a user registration/login system. The nature of my app is such that each user will be completely separated from each other user (except for admin roles). When users log in they will have their own unique index page looking at only their data which they and no-one else can ever see or edit. However, I may later want to add a role for a user to be able to view and edit several other user's data (e.g. a group of users may want to allow their secretary to access and edit their data but their secretary would not need any data of their own). My plan is to use authlogic to create the login system and declarative authorization to control permissions but before I embark on this fairly major and crucial task I thought I would canvas a few opinions as to whether this combo was appropriate for the tasks I envisage or whether there would be a better/simpler/faster/cheaper/awesomer option.

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