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• Why does Java not have any destructor like C++?

  - by Abhishek Jain

  Java has its own garbage collection implementation so it does not require any destructor like C++ . This makes Java developer lazy in implementing memory management. And Garbage Collection is very expensive. Still we can have destructor along with garbage collector where developer can free resources and which can save garbage collector's work. This might improves the performance of application. Why does Java not provide any destructor kind of mechanism? Developer does not have control over GC but he/she can control or create object. Then why not give them ability to destruct the objects?

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• Defining - and dealing with - Evil

  - by Chris Becke

  As a software developer one sometimes gets feature requests that seem to be in some kind of morally grey area. Sometimes one can deflect them, or implement them in a way that feels less 'evil' - sometimes - on reflection - while the feature request 'feels' wrong theres no identifiable part of it that actually causes harm. Sometimes one feels a feature is totally innocent but various anti virus products start tagging one as malware. For example - I personally consider EULAs to (a) hopefully be unenforceable and (b) a means by which rights are REMOVED from consumers. However Anti Virus scanners frequently mark as malware any kind of download agent that does not display a EULA. Which to me is the result of a curious kind of double think. What I want to know is - are there any online (or offline) resources that cover evil software development practices? How can I know if a software practice that I consider dodgy is in fact evil enough to consider fighting?

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• Google maps spatial reference system

  - by JavaRocky

  What is Google map's spatial reference system using when you enter a lat, long into the maps search bar? I've found hints that it might be WGS84 but after converting to that coordinate system, nothing shows up when i paste the coordinates into the google maps search box. I am converting from GDA MGA 56. Sample: Input MGA56 coords: 336301, 6253363 Expected WGS86 coords: -33.8473340793201, 151.230631835944 I get: 16834916.928327594 -4008321.1020318186 Spatial coord systems: EPSG:28356 for MGA56 EPSG:900913 for WGS86 (google maps) I am using geotools to do the transform: CoordinateReferenceSystem crsMga56 = CRS.parseWKT(mga56); CoordinateReferenceSystem crsGmaps = CRS.parseWKT(gmaps); Coordinate coordinate = new Coordinate(336301, 6253363); Point point = new GeometryFactory().createPoint(coordinate); MathTransform transform = CRS.findMathTransform(crsMga56, crsGmaps); Geometry geometry = JTS.transform(point, transform); I know the transform is not correct, as when i use an online tool it gives me the correct coords. http://www.environment.gov.au/cgi-bin/transform/mga2geo%5Fgda.pl?east=336301&north=6253363&zone=56

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• ruby on rails adding new route

  - by ohana

  i have an RoR application Log, which similar to the book store app, my logs_controller has all default action: index, show, update, create, delete.. now i need to add new action :toCSV, i defined it in logs_controller, and add new route in the config/routes as: map.resources :logs, :collection = { :toCSV = :get }. from irb, i checked the routes and see the new routes added already: rs = ActionController::Routing::Routes puts rs.routes GET /logs/toCSV(.:format)? {:controller="logs", :action="toCSV"} then ran ‘rake routes’ command in shell, it returned: toCSV_logs GET /logs/toCSV(.:format) {:controller="logs", :action="toCSV"} everything seems working. finally in my views code, i added the following: link_to 'Export to CSV', toCSV_logs_path when access it in the brower 'http://localhost:3000/logs/toCSV', it complained: Couldn't find Log with ID=toCSV i checked in script/server, and saw this one: ActiveRecord::RecordNotFound (Couldn't find Log with ID=toCSV): app/controllers/logs_controller.rb:290:in `show' seems when i click that link, it direct it to the action 'show' instead of 'toCSV', thus it took 'toCSV' as an id...anyone know why would this happen? and to fix it? Thanks...

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• C++ Mock/Test boost::asio::io_stream - based Asynch Handler

  - by rbellamy

  I've recently returned to C/C++ after years of C#. During those years I've found the value of Mocking and Unit testing. Finding resources for Mocks and Units tests in C# is trivial. WRT Mocking, not so much with C++. I would like some guidance on what others do to mock and test Asynch io_service handlers with boost. For instance, in C# I would use a MemoryStream to mock an IO.Stream, and am assuming this is the path I should take here. C++ Mock/Test best practices boost::asio::io_service Mock/Test best practices C++ Async Handler Mock/Test best practices I've started the process with googlemock and googletest.

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• Python - question regarding the concurrent use of `multiprocess`.

  - by orokusaki

  I want to use Python's multiprocessing to do concurrent processing without using locks (locks to me are the opposite of multiprocessing) because I want to build up multiple reports from different resources at the exact same time during a web request (normally takes about 3 seconds but with multiprocessing I can do it in .5 seconds). My problem is that, if I expose such a feature to the web and get 10 users pulling the same report at the same time, I suddenly have 60 interpreters open at the same time (which would crash the system). Is this just the common sense result of using multiprocessing, or is there a trick to get around this potential nightmare? Thanks

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• Restart Delphi Application Programmatically

  - by Smasher

  It should not be possible to run multiple instances of my application. Therefore the project source contains: CreateMutex (nil, False, PChar (ID)); if (GetLastError = ERROR_ALREADY_EXISTS) then Halt; Now I want to restart my application programmatically. The usual way would be: AppName := PChar(Application.ExeName) ; ShellExecute(Handle,'open', AppName, nil, nil, SW_SHOWNORMAL) ; Application.Terminate; But this won't work in my case because of the mutex. Even if I release the mutex before starting the second instace it won't work because shutdown takes some time and two instance cannot run in parallel (because of common resources and other effects). Is there a way to restart an application with such characteristics? (If possible without an additional executable) Thanks in advance.

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• Synchronization between hibernate running locally and on a server

  - by linead

  Is there an easy way using a library to facilitate the synchronization of two hibernate instances. One running locally on a client and one running on a central server exposed via a web service. So Client tracks changes it makes, pushes them to the Server. The server ensures that the clients is not updating out of sync objects and stores the clients changes. The Client can also sync with the Server so that it can see the changes made by other clients. The idea is that the client can be run offline, without access to the server and only come online to synchronize when needed.

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• namespace extension.. galaxy file system toolkit...gmail shell drive like utility...

  - by Muhammad Adnan

  i was looking for some namespace extention to extend using c# (.net) but didn't find much help online except Galaxy Filesystem tooklkit. which are vc++ based but comes with c# and java wrapper classes... which helps me alot to start and i did. i have extended that enough now and made installer to install. it get installed successfully but don't know why, when i open it, system get stuck... :( i thought my modified version might have some problem so i tried to run Galaxy filesystem toolkit's author original version and it responded in same way as mine do :D :( now feeling bit helpless as even author is not responding my queries regarding my queries for some reason... any help would be really appreciated.... FYI: i need to have Gmail drive like stuff...

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• Vendor neutral SQL

  - by Sparafusile

  I'm currently working on a project for a web application that may be installed on several different servers with various software configurations. I want to make my application as flexible as possible by allowing the user to have various SQL servers installed. The problem is the SQL syntax used by any two server vendors does not match up. For a simple example, here is the same SELECT statement for MS SQL and MySQL: MS SQL - SELECT TOP 1 * FROM MyTable ORDER BY DateCreated DESC MySQL - SELECT * FROM MyTable ORDER BY DateCreated DESC LIMIT 1 Are there any standard way to abstract the statement creation for various vendors? Any online resources or books discussing this problem? Any hints or smart-alec remarks that I'd find useful? Further information: I'm writing my we application in vanilla ASP running on a Windows server. Thanks, Spara

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• Need an alternative to two left joins.

  - by Scarface

  Hey guys quick question, I always use left join, but when I left join twice I always get funny results, usually duplicates. I am currently working on a query that Left Joins twice to retrieve the necessary information needed but I was wondering if it were possible to build another select statement in so then I do not need two left joins or two queries or if there were a better way. For example, if I could select the topic.creator in table.topic first AS something, then I could select that variable in users and left join table.scrusersonline. Thanks in advance for any advice. SELECT * FROM scrusersonline LEFT JOIN users ON users.id = scrusersonline.id LEFT JOIN topic ON users.username = topic.creator WHERE scrusersonline.topic_id = '$topic_id' The whole point of this query is to check if the topic.creator is online by retrieving his name from table.topic and matching his id in table.users, then checking if he is in table.scrusersonline. It produces duplicate entries unfortunately and is thus inaccurate in my mind.

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• Control Philips Living Colors using PC

  - by CrazyChris

  Hi guys, is there a way (hardware/software-combination) that I can use to control one or more "Philips Living Colors" lamps using a PC - e.g. a USB-stick that acts as the "remote". This way i could control the lamp through software (e.g. a web-app - over iPhone / remotely) or even create what Philips builds into some of their TVs and calls "ambilight" (graphics driver detecting the main color to control the lamp). I guess this is more like a hardware than a software question - but I couldn't find anything about this online and I'm sure not to be the first to have come up with this idea right when I unpacked my LivingColors lamp yesterday ;) Any idea/hint is appreciated. -chris

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• What are some C++ Standard Library usage best practices?

  - by apphacker

  I'm learning C++ and the book I'm reading (The C++ Programming Language) says to not reinvent the wheel, to rely on the standard libraries. In C, I often end up creating a linked list, and link list iteration over and over again (maybe I'm doing that wrong not sure), so the ideas of containers available in C++, and strings, and algorithms really appeal to me. However I have read a little online, and heard some criticisms from my friends and coworkers about STL, so I thought I maybe I'd pick some brains here. What are some best practices for using STL, and what lessons have you learned about STL?

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• Why do Java/C# edge out C++ as the recommended language to learn OOP on S.O?

  - by viksit

  I noticed after reading the answers/discussion to this question (What is the best language to learn OOP on?) - that more and more people are recommending C# or Java over C++ to learn OOP on. A simple term search on that answer page results in 10 hits for C++, 21 for C# and 27 for Java. Now, I understand that these 2 languages fix a lot of quirks and issues with C++, and looked up these resources that relate mostly to performance, JVM vs native implementation, systems focus vs applications, manual memory management vs automated et al. My question is - are there any fundamental differences in the OO capabilities of Java/C# vs C++? Or are the former recommended purely due to their generic ease of use/improvements over the latter? Thanks. PS, I'm aware of Java interface inheritance vs C++ multiple inheritance as a difference. I would consider that an implementational one rather than functional.

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• How to get unique URL identifier after inserting item in Google Base with Zend Gdata API?

  - by msumme

  I need to get the unique URL identifier for the product that is created after inserting an item into Google Base using the Zend_Gdata_Gbase library. I can't seem to do this. I am finding a startling lack of documentation online about manipulating the objects used in these applications. The url that I add to the object does not work to retrieve the base item later, which is why I need to get the one that google generates upon submission. I am writing a program that will need to be able to delete content at a later date, and thus will need to store that information in order to keep the website synced with the Google Base feed. Thanks in advance for any help.

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• Android Template Application?

  - by stormin986

  I have built an application that I want to use as the foundation for a few other variants. The variants will come from assets / resource files and a unique AndroidManifest.xml. However, I want to be able to leave all the application code alone (modifying the package of all my classes, etc). I'm having a hard time figuring out how to do so. My first thought was to simply have my main application in its own package, and then specify the specific application package in the manifest. However, this gives me issues with the generated R.java class, since it is generated to be in the main application's package. Anyone have any thoughts on how to accomplish this? To have a code baseline, and the application variants happen in resources/assets and the manifest?

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• JQuery/JavaScript div tag "containment" approach/algorithm?

  - by Pete Alvin

  Background: I've created an online circuit design application where div tags are containers that contain smaller div containers and so forth. Question: For any particular div tag I need to quickly identify if it contains other div tags (that may in turn contain other div tags). I've searched JQuery and I don't see any built-in routine for this. Does anyone know of an algorithm that's quicker than O(n^2)? Seems like I have to walk the list of div tags in an outer loop (n) and have an inner loop (another n) to compare against all other div tags and do a "containment test" (position, width, height), building a list of contained div tags. That's n-squared. Then I have to build a list of all nested div tags by concatenating contained lists. So the total would be O(n^2)+n. There must be a better way?

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• jQuery jPicker path issues when used in WordPress Theme Options

  - by Scott B

  Anyone with experience using jPicker colorpicker in a WordPress Custom Theme options panel. I believe that the default path for the jPicker resources is /jPicker/ relative to the location the js file appears, however, I'm not seeing the picker.gif icon, so I tried changing the path in the js file like so... images:{clientPath:"../wp-content/themes/myTheme/images/" Everything else appears to be working at first load. My bound input field's background color is the same as the currently selected color. However, the picker.gif icon is missing. Where it should appear, I've just got a 2px wide by 20px tall color element (looks like a div perhaps).

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• map.resource, parameter restrictions

  - by Tiago

  I've a controller :platform here. I'm trying to do something like: /:platform_name/ to redirect to its show, with the parameter. Here is what I've got: map.resource :platform, :as => ':platform_name', :platform_name => /pc|ps2|ps3|wii|ds|psp|xbox-360/ It's working fine. I've other neasted resources to it, and all them are accessing. But. The problem is, I've only those platform names, but when it doesnt fine another route, it aways fall on this. if I try /whatever/, it will look for the *platform_name = whatever*. I was expecting it to fall into the map.connect ':controller/:action/:id' rule. When I did *:platform_name = /pc|ps2|ps3|wii|ds|psp|xbox-360/*, wasnt expected that this rule only apply when the regular expression is fit? how could i restrict this?

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• Weird Rails URL issue when rendering a new action

  - by Tony

  I am rendering a new action but somehow getting the "index" URL. To be more specific, my create action looks like this: class ListingsController < ApplicationController def create @listing = Listing.new(params[:listing]) @listing.user = @current_user if @listing.save redirect_to @listing else flash[:error] = "There were errors" render :action => "new" end end end When there are errors, I get the "new" action but my URL is the index URL - http://domain.com/listings Anyone know why this would happen? My routes file is fairly standard: map.connect 'listings/send_message', :controller => 'listings', :action => 'send_message' map.resources :listings map.root :controller => "listings" map.connect ':controller/:action/:id' map.connect ':controller/:action/:id.:format'

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• Holy grail layout with 100% height

  - by Henrik Skogmo

  I am trying to make a css layout that looks like this http://oi53.tinypic.com/o0v0vp.jpg The CSS term for this type of layout is known as the "holy grail" I think. The problem I am facing is that when I use layouts and solutions I find online I do not get them to work properly as I want them to. What I am trying to do is make a page that, regardless of content, will have the footer at the bottom of the browser and the columns stretching down to it. So far I have only seen pages that have the footer placed where the content stop, the result is some blank space under the footer. If anyone could help me out on this it would be greatly appreciated!

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• Visual Studio 2010 + ReSharper Not Working

  - by Joel

  I've installed ReSharper 5 on two installations of Visual Studio 2010 Professional. In both cases, ReSharper claims it has installed successfully - but Visual Studio doesn't recognize the extension. It doesn't show up in the Extensions Manager, doesn't appear in Help - About - Installed products, and can't be found anywhere else in the environment. I've tried install / uninstall of both Visual Studio and ReSharper, computer restarts, etc. Both machines have Visual Studio 2008 and ReSharper 5 works fine in these IDEs, and both machines are running Windows 7. I've found other people online with this issue, but no solutions. Anyone know how to fix this?

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• Use a light font weight with Sifr

  - by Smickie

  Hi, With sifr, how do I make a font use the light weight version. I have... var gillsans = { src: '/resources/swf/gillsans.swf' }; sIFR.activate(gillsans); sIFR.replace(gillsans, { selector: 'h1', css: '.sIFR-root { background-color: #FFFFFF; color: #000000; text-transform:uppercase; }' }); which is displaying regular Gill Sans, the light version has been exported with the swf (said so in the export report), but how do I get it to display in sifr?

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• Problems with noobs putting my GA code into their sites

  - by dclowd9901

  I don't mean for the title to be derogatory, but this is a rather frustrating problem, and I'm looking for a good workaround, given a language barrier involved. I have a site set up for a plugin I wrote, and, rather than use the site's resources to write their own code, I've had people simply rip the code from the samples on the site. Normally, this wouldn't be any issue at all, but they are also taking my Google Analytics instantiation, so my Analytics data is getting very skewed by incorporating visitation data from their websites. I've been able to contact the English-speaking site owners with little issue. The problem lies in the Japanese language sites that are yanking the code. I have no idea how to ask them to take down the analytics portion. Long-term, I'm providing a package that streamlines the learning-to-use process, but in the meantime, what can I do about this language barrier? Is there a way around this problem that I haven't thought of?

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• Code Design Process?

  - by user156814

  I am going to be working on a project, a web application. I was reading 37signals getting real pamphlet online (http://gettingreal.37signals.com/), and I understand the recommended process to build the entire website. Brainstorm, sketch, HTML, code. They touch on each process lightly, but they never really talk much about the coding process (all they say is to keep code lean). I've been reading about different ways to go about it (top to bottom, bottom to top) but I dont know much about each way. I even read somewhere that one should write tests for the code before they actually write the code??? WHAT? What coding process should one follow when building an application. if its necessary, I'm using PHP and a framework.

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