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• What makes you come back to stackoverflow every day? [closed]

  - by rmarimon

  I know this is not a programming question. Let's try to label it a programming community question so that it doesn't get closed. I've been wondering what makes the programming community so prone to helping others in stackoverflow. Is this something particular to programmers? Do you think lawyers and accountants would help other lawyers and programmers as we do? What makes you come back to stackoverflow every day? It would be great to have an answer per reason so that we can get the list of reasons. In my case, I come to stackoverflow to ask questions that I can't solve quickly, and to test how good I am when answering questions. So far I’ve failed miserably at trying to answer questions but it has helped me understand how little I know.

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• Should classes that hold references to IDisposable objects be IDisposable as well and set them to nu

  - by Trap

  I think the question says it all. Thanks.

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• Time to ignore IDisposable?

  - by Mystagogue

  Certainly we should call Dipose() on IDisposable objects as soon as we don't need them (which is often merely the scope of a "using" statement). If we don't take that precaution then bad things, from subtle to show-stopping, might happen. But what about "the last moment" before process termination? If your IDisposables have not been explicitly disposed by that point in time, isn't it true that it no longer matters? I ask because unmanaged resources, beneath the CLR, are represented by kernel objects - and the win32 process termination will free all unmanaged resources / kernel objects anyway. Said differently, no resources will remain "leaked" after the process terminates (regardless if Dispose() was called on lingering IDisposables). Can anyone think of a case where process termination would still leave a leaked resource, simply because Dispose() was not explicitly called on one or more IDisposables? Please do not misunderstand this question: I am not trying to justify ignoring IDisposables. The question is just technical-theoretical.

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• Named Function Expressions in IE, part 2

  - by Polshgiant

  I asked this question a while back and was happy with the accepted answer. I just now realized, however, that the following technique: var testaroo = 0; (function executeOnLoad() { if (testaroo++ < 5) { setTimeout(executeOnLoad, 25); return; } alert(testaroo); // alerts "6" })(); returns the result I expect. If T.J.Crowder's answer from my first question is correct, then shouldn't this technique not work?

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• Struts2 <s:bean/> tag, used to instanciate a Parametric Bean

  - by Rasatavohary

  Hi, After looking a while other google, and the web, I decided to post my question here. The question is quite really basic, and simple : How do I use the struts2 tag <s:bean ... /> to instanciate a Parametric Bean ? For example imagine I have : public class GenericBean<T> { ... How will I instanciate this bean with a BeanType for instance, inside a jsp using struts 2 ? <s:bean name="GenericBean" var="myBean"/> Thanks you.

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• Are primitive types garbage collected in Android?

  - by snctln

  I know this may be a dumb question, but my background is more in c++ and managing my own memory. I am currently cutting down every single allocation that I can from one of my games to try and reduce the frequency of garbage collection and perceived "lag", so for every variable that I create that is an Object (String and Rect for example) I am making sure that I create it before hand in my constructor and not create temporary variables in simple 10 line functions... (I hope that makes sense) Anyways I was working though it some more tonight and I realized that I may be completely wrong about my assumption on garbage collection and primitive types (int, boolean, float) are these primitive type variables that I create in a 10 line function that gets called 20 times a second adding to my problem of garbage collection? So a year ago every few seconds I would see a message in logcat like GC freed 4010 objects / 484064 bytes in 101ms Now I see that message every 15-90 seconds or so... So to rephrase my question: Are primitive types (int, float, boolean, etc) included when seeing this message?

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• Should classes that are passed references to IDisposable objects be IDisposable as well and set them

  - by Trap

  I think the question says it all. Thanks.

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• Showing all a Gem's build flags

  - by Rob

  This is more a curiosity than necessity question. I've just installed nokogiri again with RubyGems and it is saying "WARNING: Nokogiri was built against LibXML version 2.7.5, but has dynamically loaded 2.7.6" This is easy enough to fix, but it lead to a more general question: how do I see all the configuration options for a rubygem before installing it? I found the easiest way I know how is to visit the gem folder an run "ruby nokogiri-0.0.0/ext/nokogiri/extconf.rb -h" and that shows me it, but there has to be an easier way, right? I was expecting some kind of "sudo gem install nokogiri -- --help" command that would show the build flags. I've searched around a bit but didn't see anything, anybody know how to do this before I go digging into RG's source :)?

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• Insert element into a tree from a list in Standard ML

  - by vichet

  I have just started to learn SML on my own and get stuck with a question from the tutorial. Let say I have: tree data type datatype node of (tree*int*tree) | null insert function fun insert (newItem, null) = node (null, newItem, null) | insert (newItem, node (left, oldItem, right)) = if (newItem <= oldItem) then node (insert(newItem,left),oldItem, right) else node (left, oldItem, insert(newItem, right) an integer list val intList = [19,23,21,100,2]; my question is how can I add write a function to loop through each element in the list and add to a tree? Your answer is really appreciated.

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• when is a push notification old?

  - by hookjd

  I have noted that when the iPhone OS receives a push notification, it considers that a user action to click on the action button as a "response" to the push notification for some indefinite period of time. If the user lets the push notification sit on screen for a number of seconds, or lets the phone go to sleep, the phone no longer considers the users action as a response to the push notification itself, and therefore does not launch the corresponding app. So my question is... does anyone know what the precise definition from the iPhone OS is as to how long the phone considers a push notification response to be corresponding to the push? Sorry, I can't find a great way to phrase this question, but I hope it makes sense. I'm guessing its something like 20 seconds from my testing, but I don't see this specifically documented anywhere.

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• how do I know when/where to invoke the overridden method of the super class

  - by Henry

  Hi, This question occured to me while programming a Android application, but it seems to be a general programming question more. The situation is, I am extending (subclass-ing) an class from a library, and overriding a method. how do I know if I should invoke the method of super-class? and when? (in the beginning of the overridden method or in the end?) For example, I am overriding the method "public boolean onCreateOptionsMenu(Menu menu)" from class "Activity" in Android platform. And I saw someone write "return super.onCreateOptionsMenu(menu)" in the end of the method, in an example. But how do I know it should be done this way? and it is correct or not? what's the difference if I begin my method with "super.onCreateOptionsMenu(menu)"? BR, Henry

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• Discrete mathematics problem - Probability theory and counting

  - by Mohammad

  Hello All, I'm taking a discrete mathematics course, and I encountered a question and I need your help. I don't know if this is the right place for that though :) It says: Each user on a computer system has a password, which is six to eight characters long, where each character is an uppercase letter or a digit. Each password must contain at least one digit. How many possible passwords are there? The book solves this by adding the probabilities of having six,seven and eight characters long password. However, when he solves for probability of six characters he does this P6 = 36^6 - 26^6 and does P7 = 36^7 - 26^7 and P8 = 36^8 - 26^8 and then add them all I understand the solution, but my question is why doesn't calculating, P6 = 10*36^5 and the same for P7 and P8, work? 10 for the digit and 36 for the alphanumeric? Also, if anyone could give me another solution, other than the one in the book. Thank you very much :)

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• MSSQL Efficiently dropping a group of rows with millions and millions of rows

  - by Net Citizen

  I recently asked this question: http://stackoverflow.com/questions/2519183/ms-sql-share-identity-seed-amongst-tables (Many people wondered why) I have the following layout of a table: Table: Stars starId bigint categoryId bigint starname varchar(200) But my problem is that I have millions and millions of rows. So when I want to delete stars from the table Stars it is too intense on MS SQL. I cannot use built in partitioning for 2005+ because I do not have an enterprise license. When I do delete though, I always delete a whole category Id at a time. I thought of doing a design like this: Table: Star_1 starId bigint CategoryId bigint constaint rock=1 starname varchar(200) Table: Star_2 starId bigint CategoryId bigint constaint rock=2 starname varchar(200) In this way I can delete a whole category and hence millions of rows in O(1) by doing a simple drop table. My question is, is it a problem to have thousands of tables in your MS SQL? The drop in O(1) is extremely desirable to me. Maybe there's a completely different solution I'm not thinking of?

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• Bounce Email handling with PHP??

  - by mcfadder_09

  I am really new to this (not new to php). Here is my scenario: I have 2 emails accounts. [email protected] and [email protected]. I want to send email to all my users with [email protected] but then "reply to" [email protected] (until here, my php script can handle it). When, the email cant be sent, it sent to [email protected], the error message could be 553 (non existent email ...) etc. My question is: How do I direct all those bounce emails (couldn't sent emails) to [email protected] through a handling script to check for the bounce error codes? What programming language should I be for the "handling script"? What would the "handling script" looks like? Can give a sample? OR:(Big Question) What are the procedures I should follow to handle the bounce email ??

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• How can I de-install a Perl module installed via `cpan`?

  - by Kinopiko

  I am using Perl running in user space (not installed via root) and installing modules via the command-line cpan. I would like to know if there is a simple way to remove a module without having to do a lot of work deleting individual files. I searched for this question on the internet and found some answers, but the answers I've found seem to either discuss using the Perl package manager (specific for Microsoft Windows), otherwise operating-system specific (BSDpan), suggesting using cpanplus (which I've had several bad experiences with), or ended by pointing to a dead link as follows: http://www.cpan.org/misc/cpan-faq.html#How_delete_Perl_modules. My question is specifically whether there is a clean way to remove a module installed via cpan.

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• Fields of class, are they stored in the stack or heap?

  - by Mirek

  I saw a question yesterday which raised (for me) another question. Please look at the following code: public class Class1 { int A; //as I uderstand, int is value type and therefore lives in the stack } class Class2 { Run() { Class1 instance1 = new Class1(); instance1.A = 10; //it points to value type, but isnt this reference (on heap)? } } Or while creating the instance of Class1, its field types are created on the heap as well? But then I do not understand when it would really be on the stack as almost always you need to create an instance of object in order to use it fields.

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• WPF Localization Using LocBaml: Handling Special Symbols

  - by Aryeh

  Hello, I’m dealing with localization of a WPF application (Visual Studio 2010 under Windows 7). I’ve just accomplished the whole process of localization using LocBaml tool, as explained in WPF Globalization and Localization Overview and in related posts. The target language is Italian (it-IT culture). When I run my application in Italian, I have a problem with interpretation of the special symbols of © and ™: they both appear there as a white question sign upon a black diamond-shaped background. The symbols © and ™ appear identically in both English and Italian CSV-files. I tried also the special letters (such as È, à etc.) that are present in Italian but absent in English, and they also are interpreted as the above diamond-shaped question. In Region and Language, I changed the system locale to Italian[Italy], restarted the PC and ran the application again – this helped me in the past to cope with a similar problem in localization of C++ applications under Windows XP, but now it didn’t help, either. Has somebody any idea what is the catch here?

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• Url encode and routing?

  - by Curtis White

  I'm using custom routing in a web forms context. I have some titles (part of my custom route) that have say a question mark character. When I URL encode this text ("Question?") and then pass into my route, I get an HTTP ERROR CODE 400. Apparently, the URL encoded text is somehow confusing the routing manager. Can someone provide context and explanation for this? Beyond that, I'm thinking I don't need to URL encode these route data but merely strip out the problem characters. Are there any security risks to not using URL decode/encode? And what are the problem characters? A list would be useful. Thanks!

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• Are ORM's counterproductive to OO design?

  - by Jeremiah

  In OOD, design of an object is said to be characterized by its identity and behavior. Having used OR/M's in the past, the primary purpose, in my opinion, revolves around the ability to store/retrieve data. That is to say, OR/M objects are not design by behavior, but rather data (i.e. database tables). Case and point: Many OR/M tools come with a point-to-a-database-table-and-click-object-generator. If objects are no longer characterized by behavior this will, in my opinion, muddy the identity and responsibility of the objects. Subsequently, if objects are not defined by a responsibility this could lend a hand to having tightly coupled classes and overall poor design. Furthermore, I would think that in an application setting, you would be heading towards scalability issues. So, my question is, do you think that ORM's are counterproductive to OO design? Perhaps the underlying question would be whether or not they are counterproductive to application development.

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• Microsoft Robotics Studio, simple simulation ! MSRS Newbie ! ....

  - by Arkapravo

  I am soon to start with Microsoft Robotics Studio. My question is to all the gurus of MSRS, Can simple simulation (as obstacle avoidance and wall following) be done without any hardware ? Does MSRS have 3-dimensional as well as 2-dimensional rendering? As of now I do not have any hardware and I am only interested in simulation, when I have the robot hardware I may try to interface it! Sorry for a silly question, I am a MSRS noob, but have previous robotics h/w and s/w experience.

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• how to read a User uploaded file, without saving it to the database

  - by GoodGets

  I'd like to be able to read an XML file uploaded by the user (less than 100kb), but not have to first save that file to the database. I don't need that file past the current action (its contents get parsed and added to the database; however, parsing the file is not the problem). Since local files can be read with: File.read("export.opml") I thought about just creating a file_field for :uploaded_file, then trying to read it with File.read(params[:uploaded_file]) but all that does is throw a TypeError (can't convert HashWithIndifferentAccess into String). I really have tried a lot of various things (including reading from the /tmp directory as well), but could get none of them to work. I hope the brevity of my question doesn't mask the effort I've given to try to solve this on my own, but I didn't want to pollute this question with a hundred ways of how NOT to get it done. Big thanks to anyone who chimes in.

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• Passenger apache default page error

  - by Ganesh Shankar

  Sorry if this is the wrong place to ask this question. I asked it a couple of days ago on Server Fault but am getting no love. (It is sort of related to rails development...) The Question I just installed Passenger and the Passenger Pref Pane on OSX. However, when I try to browse to one of my Rails applications I just get the default Apache "it works!" page. I've checked the vhost definitions and they seem ok so I can't seem to figure out whats wrong... I've tried reinstalling passenger and the pref pane and restarting apache but to no avail. Anyone know how to fix this? My vhost definition looks like this: <VirtualHost *:80> ServerName boilinghot.local DocumentRoot "/Users/ganesh/Code/boilinghot/public" RailsEnv development <Directory "/Users/ganesh/Code/boilinghot/public"> Order allow,deny Allow from all </Directory> </VirtualHost>

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• Starting work on a Pre-existing Project

  - by Toymakerii

  So this is more of a generic question. I seem to keep finding myself being put on larger and larger projects. Recently I have been assigned to a very large project written in C and VHDL. The goal is for me to become familiar with the code and eventually take the lead on the project. This is by far the largest project I have been assigned to work on that I didn't start. So here is my question: What methods/tools do you use to learn how everything works? Do you just increase and expand on comments? Do you make a UML representation of the project? Any tips would be great! Thanks

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• What is a good pattern for binding a collection of objects coming from WCF, in Silverlight?

  - by Krishna

  Hi there, I've got a question about a Silverlight WCF Databinding pattern: There are many examples about how to bind data using {Binding} expressions in XAML, how to make async calls to a WCF service, set the DataContext property of a element in the UI, how to use ObservableCollections and INotifyPropertyChanged, INotifyCollectionChanged and so on. Background: I'm using the MVVM pattern, and have a Silverlight ItemsControl, whose ItemsSource is set to an ObservableCollection property on my ViewModel object. My view is of course the XAML which has the {Binding}. Say the model object is called 'Metric'. My ViewModel periodically makes calls to a WCF service that returns ObservableCollection. MetricInfo is the data transfer object (DTO). My question is two-fold: Is there any way to avoid copying each property of MetricInfo to the model class - Metric? When the WCF calls completes, is there any way to make sure I sync the items which are in both my local ObservableCollection and the result of the WCF call - without having to first clear out all the items in the local collection and then add all the ones from the WCF call result? thanks, Krishna

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• What is the recommended method of HTTP Redirection from multiple URLs to one URL?

  - by ChrisHDog

  I have a website that has a number of URLs that people use to connect to that site (uses the bindings on the IIS website and everything works as intended): http://www.sample.com http://sample.com https://www.sample.com http://xyz.sample.com http://oldurl.com Now what I want to do is have all of the URLs go to https://www.sample.com - so if you type in "http://xyz.sample.com" or "sample.com" you should go to https://www.sample.com The question is what is the best mechanism to do this? I have one possible solution (which I will put as an answer to this question), but I get the feeling that there might be another, better solution available.

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