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• Removing Divider Line from UISplitViewController

  - by tilomitra

  Guys, I know a similar question exists but the thread seems to be inactive, and I really would like this question to be answered. It's been annoying me for a few days now. I'm wondering how to remove the divider line between the Master and Detail view in the UISplitViewController. I know its possible to remove/hide/cover it up because I see some apps in the store without that line. I have tried setting backgroundColor to clearColour on my views but to no avail. So SO community, you're my only hope!

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• Problems with mod_Rewrite

  - by Giorgi

  Hello, Originally I had following .htaccess file: php_value display_errors 1 php_value error_reporting 7 AddDefaultCharset utf-8 Options -Indexes <Files ~ ".*\.(info|tpl)$"> Order allow,deny Deny from all </Files> RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php/$1 [L,QSA] Which triggered 500 internal server error, so I moved first two lines to the php.ini file. after that, error disappeared, but redirect is not working, it simply redirects to the empty page, error log shows: file not found also, another log shows: PHP Warning: Unknown: open_basedir restriction in effect. File() is not within the allowed path(s): (/home/:/usr/lib/php:/usr/local/lib/php:/tmp/:/usr/local/:/usr/bin) in Unknown on line 0 I tried to write in RewriteLog which triggered 500 server error again A little help? Thank you in advance P.S. cPanel 11.24.5-STABLE (Build: 38506) Apache version 2.2.15 (Unix) MySQL version 5.0.85-community PHP version 5.2.9 Operating system Linux Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_fcgid/2.3.5

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• How to find the right balance between "quick & dirty" and "nice & general" code?

  - by Frank

  This is not a direct programming question, but a little help from the programming community would be appreciated. I am suffering from an overgeneralization disease. I can't stop spending valuable time with making my code most general and abstract. I could also call it the toolkit/library disease. I tend to turn every programming task into a general problem and try to "write a toolkit", that would work for many similar problems. I know it's a good thing in general, if there is enough time, but sometimes I should be writing a quick prototype and just can't seem to write the quick and dirty code that just works for the special case. I often get excited about an idea that makes the code more general and user-configurable and understimate the time it takes to actually implement it that way. Does anyone else have this experience? How can I force myself to find the right balance between "quick hack" and "nice solution"?

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• Tracking unique versions of files with hashes

  - by rwmnau

  I'm going to be tracking different versions of potentially millions of different files, and my intent is to hash them to determine I've already seen that particular version of the file. Currently, I'm only using MD5 (the product is still in development, so it's never dealt with millions of files yet), which is clearly not long enough to avoid collisions. However, here's my question - Am I more likely to avoid collisions if I hash the file using two different methods and store both hashes (say, SHA1 and MD5), or if I pick a single, longer hash (like SHA256) and rely on that alone? I know option 1 has 288 hash bits and option 2 has only 256, but assume my two choices are the same total hash length. Since I'm dealing with potentially millions of files (and multiple versions of those files over time), I'd like to do what I can to avoid collisions. However, CPU time isn't (completely) free, so I'm interested in how the community feels about the tradeoff - is adding more bits to my hash proportionally more expensive to compute, and are there any advantages to multiple different hashes as opposed to a single, longer hash, given an equal number of bits in both solutions?

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• SQL 2003 Distance Latitude Longitude

  - by J.Hendrix

  I have a table full of Dealers along with their latitude and longitude. I am trying to determine the top n closest dealers to any given lat and lon. I already have the function to calculate distance between locations, but I want to do as few calculations as possible (my table can contain many thousands of entries). Currently I have to calculate the distance for each entry then sort them. Is there any way to sort before I do the calculation to improve performance? This question is good, but I will not always know my range. Should I just pick an arbitrarily high range then refine my results? I am thankful for any help the community can offer. declare @Lat real declare @lon real Set @lat = 41.05 Set @lon = -73.53 SELECT top 10 MemberID, Address1, City, State, Zip, Phone, Lat, Lon, (SELECT fun_DistanceLatLon] (@Lat,@lon,Lat,Lon)) as mDistance --Calculate distance FROM Dealers Order by (SELECT fun_DistanceLatLon] (@Lat,@lon,Lat,Lon))

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• Most mind-blowing C++ hack you've ever seen?

  - by sblom

  In the same spirit as the "Hidden features of X?" series, what are the most mind-blowingly well-executed "I didn't even think the language could do that!" hacks that you've ever seen in C++. For example, my recent favorite is an implementation of the "operator" --> for pre-C++0x lambdas. Another fantastic example is Multi-dimensional analog literals. (Note: this is a community wiki question to avoid the appearance of reputation-whoring.)

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• Is it proper to get and especially set Perl module's global variables directly?

  - by DVK

  I was wondering what the best practice in Perl is regarding getting - or, more importantly, setting - a global variable of some module by directly accessing $Module::varName in case the module didn't provide getter/setter method for it. The reason it smells bad to me is the fact that it sort of circumvents encapsulation. Just because I can do it in Perl, I'm not entirely certain I should (assuming there actually is an alternative such as adding a getter/setter to the module). I'm asking this because I'm about to request an addition of a getter/setter for a global variable in one of the core Perl modules, and I would like to avoid it soundly and unanimously rejected on the grounds of "Why the heck do you need one when you can access the variable in the package directly?" - in case doing the latter is actually considered perfectly OK by the community.

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• What causes the error "Can't execute code from a freed script"

  - by tjrobinson

  I thought I'd found the solution a while ago (see my blog): If you ever get the JavaScript (or should that be JScript) error "Can't execute code from a freed script" - try moving any meta tags in the head so that they're before your script tags. ...but based on one of the most recent blog comments, the fix I suggested may not work for everyone. I thought this would be a good one to open up to the StackOverflow community.... What causes the error "Can't execute code from a freed script" and what are the solutions/workarounds?

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• Ruby on Rails website hosting

  - by sfactor

  i want to start a website. it'll be a small community based website. i've learned a fair bit of ruby on rails and am planning to use it. however, i have never deployed a production website before. i've just practiced in my local computer. i wanted to know what are the things i need to deploy the website on the internet. what is the best place to get a domain name and web hosting, esp for ruby on rails sites. how are cloud based services like amazon EC2 etc different from a traditional web host. which is a better choice. what else might i need to do to deploy a website. also i may happen to have a fair bit of users in the future. so how to go about planning for scalability issues. how to sites like twitter, fmylife.com etc all go about these things.

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• Does ActiveRecord make Ruby on Rails code hard to test?

  - by Erik Öjebo

  I've spent most of my time in statically typed languages (primarily C#). I have some bad experiences with the Active Record pattern and unit testing, because of the static methods and the mix of entities and data access code. Since the Ruby community probably is the most test driven of the communities out there, and the Rails ActiveRecord seems popular, there must be some way of combining TDD and ActiveRecord based code in Ruby on Rails. I would guess that the problem goes away in dynamic languages, somehow, but I don't see how. So, what's the trick?

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• How do you mock a Sealed class?

  - by Brett Veenstra

  Mocking sealed classes can be quite a pain. I currently favor an Adapter pattern to handle this, but something about just keeps feels weird. So, What is the best way you mock sealed classes? Java answers are more than welcome. In fact, I would anticipate that the Java community has been dealing with this longer and has a great deal to offer. But here are some of the .NET opinions: Why Duck Typing Matters for C# Develoepers Creating wrappers for sealed and other types for mocking Unit tests for WCF (and Moq)

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• How to get users to read error messages?

  - by FX

  If you program for a nontechnical audience, you find yourself at a high risk that users will not read your carefully worded and enlightening error messages, but just click on the first button available with a shrug of frustration. So, I'm wondering what good practices you can recommend to help users actually read your error message, instead of simply waiving it aside. Ideas I can think of would fall along the lines of: Formatting of course help; maybe a simple, short message, with a "learn more" button that leads to the longer, more detailed error message Have all error messages link to some section of the user guide (somewhat difficult to achieve) Just don't issue error messages, simply refuse to perform the task (a somewhat "Apple" way of handling user input) Edit: the audience I have in mind is a rather broad user base that doesn't use the software too often and is not captive (i.e., not an in-house software or narrow community). A more generic form of this question was asked on slashdot, so you may want to check there for some of the answers.

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• C++ project type: unicode vs multi-byte; pros and cons

  - by Stefan Valianu

  I'm wondering what the Stack Overflow community thinks when it comes to creating a project (thinking primarily c++ here) with a unicode or a multi-byte character set. Are there pros to going Unicode straight from the start, implying all your strings will be in wide format? Are there performance issues / larger memory requirements because of a standard use of a larger character? Is there an advantage to this method? Do some processor architectures handle wide characters better? Are there any reasons to make your project Unicode if you don't plan on supporting additional languages? What reasons would one have for creating a project with a multi-byte character set? How do all of the factors above collide in a high performance environment (such as a modern video game) ?

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• White (Light) vs. Black (Dark) Backgrounds: Health Effects

  - by Hosam Aly

  I am adding a bounty to this question, hoping for some scientific research results. Thank you everybody! I have recently tried working on dark backgrounds, and it seemed (to me) to be easier on the eye. However, today I read Gerrie Schenck's comment on this answer, in which he said that mainframe developers were advised to use white backgrounds instead of black, as it is said that white is easier on the eye. So which one is actually better for the eyes in the long run? I would be thankful for any (scientific) references about the subject, as my eyes really need some relaxation. I wanted to make this question a community wiki, but I think that the least I can do to thank people is to reward their answers, so I'm leaving it as a normal question. Many, many thanks for your help. P.S. I don't know which tags would be appropriate for this question, so I'd be grateful if you could tag it in a better way than I did.

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• OpenCart Service Scheduling

  - by Jason Palmer

  I am looking to develop an extension to OpenCart which will allow me to both sell products and sell scheduled services. For the scheduled services, I would like to have the storefront interface change so the customer sees a calendar. It would be Nirvana for the calendar to show only available dates/times, but at the very least they should see a calendar. Then, on the administrative side, there should be a place where there is a list of desired dates/times for scheduled services. I'm wondering if anyone is aware of community-developed extensions which do this, or come close? If not, any recommendations for how to accomplish this properly are welcome. Thanks in advance.

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• Are there any existing batch log file aggregation solutions?

  - by Mohan Gulati

  I wish to export from multiple nodes log files (in my case apache access and error logs) and aggregate that data in batch, as a scheduled job. I have seen multiple solutions that work with streaming data (i.e think scribe). I would like a tool that gives me the flexibility to define the destination. This requirement comes from the fact that I want to use HDFS as the destination. I have not been able to find a tool that supports this in batch. Before re-creating the wheel I wanted to ask the StackOverflow community for their input. If a solution exists already in python that would be even better.

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• Performance Testing Versus Unit Testing

  - by Mystagogue

  I'm reading Osherove's "The Art of Unit Testing," and though I've not yet seen him say anything about performance testing, two thoughts still cross my mind: Performance tests generally can't be unit tests, because performance tests generally need to run for long periods of time. Performance tests generally can't be unit tests, because performance issues too often manifest at an integration or system level (or at least the logic of a single unit test needed to re-create the performance of the integration environment would be too involved to be a unit test). Particularly for the first reason stated above, I doubt it makes sense for performance tests to be handled by a unit testing framework (such as NUnit). My question is: do my findings / leanings correspond with the thoughts of the community?

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• Hibernate - hibernate.hbm2ddl.auto = validate

  - by azp74

  I am interested in how hibernate.hbm2ddl.auto=validate actually works and I am struggling to find comprehensive documentation. We've recently discovered production system was affected by http://opensource.atlassian.com/projects/hibernate/browse/HHH-3532 (Hibernate matches foreign keys on name, rather than signature and so will recreate them for you) and hibernate.hbm2ddl.auto=update is being removed from our next release. I would be quite happy to just get rid of hibernate.hbm2ddl.auto altogether and manage our database ourselves. However, not all my colleagues share this world view and some are keen to add back in hibernate.hbm2ddl.auto=validate. I'm concerned this will hit the same problem and I'm interested in finding more documentation about how this validation actually works. The Hibernate Community Documentation (http://docs.jboss.org/hibernate/core/3.3/reference/en/html/session-configuration.html) really just makes reference to the values. Does anyone have any good documentation pointers, or any real life experience of using validate in a production system?

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• Exporting tasks to 'C using DPI

  - by Alphaneo

  I have an verilog based test-bench, interfaced to 'C source using DPI. Now using DPI I am planning to write my whole firmware. To do this I need 3 things Register Read Register Write Interrupt handler As I understand, register reads and writes are tasks that I need to export from the RTL test-bench. And Interrupt handler (I implemented by importing a function from 'C). I checked most the cadence documentation and found no useful hints. I have also registered with cadence users community but it seems that I cannot ask question till they approve my registration. Just in case someone is aware of this, would appreciate their help.

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• Languages and development methodologies

  - by Carlos

  Having never worked with Ruby on Rails, I looked it up on Wikipedia. It says It is intended to be used with an Agile development methodology that is used by web developers for rapid development. This got me asking how a given language/framework can be more appropriate for given development methodologies. Are there certain languages that are more friendly for pair programming, for instance? Are there language features that make certain methodologies are more appropriate? Are there features that make certain methodologies impossible? My initial reaction is to dismiss the connection (the design process is a business process, which is more dependent on business needs that language features). But I'm an only programmer within the firm, and I'm a partner, so I get to decide the business needs. What do you think? Also, if the SO community finds that certain languages point towards certain methodologies, what methodology is most common for c#, which is what I use most of the time?

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• Best Open Source Java CMS

  - by LuRsT

  I'm trying to find a good Java cms, I've stumbled uppon some that are quite good like: Apache Lenya, dotCMS, Info Glue, Open Edit, MMBase, Contelligent, Hippo CMS Which on do you guys recommend, or even one that I'm missing, because I have some more that I am studying at the moment. The requirements are that I can build modules for it with ease, and that it is open source and free, and with LDAP support. The problem is that I'm not that into Java in web, that's why I'm having trouble finding a good one. One Java cms like dotNetNuke would be the best. Edit: Jahia is off the list because it has no suport for LDAP (community version) Thanks!

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• Web Services vs Persistent Sockets

  - by dsquires

  I plan on doing a little benchmarking around this question, myself. But I thought it would be good to get some initial feedback from "the community". Has anyone out there done any analysis regarding the pros and cons of these two technologies? My thoughts: Opening and closing TCP/IP connections for web service calls is relatively expensive compared to persistent connections. Dealing with intermittent connection errors and state, etc... would be easier with a web service based framework. You don't see World of Warcraft using web services. One question that I can't seem to find much of answer for anywhere (even on here)... are the limits on the # of persistent connections a single network card can support, etc?

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• Best Persistence API for use with GWT

  - by KevMo

  What is the best persistence API for use with GWT? Sadly, the application will be hosted on my own java server, as I will need more control than GAE will give me. I know I will need to have two sets of my entities, one for the server side, and some pojo's for the client side. I'm looking to make the mapping of the data as simple as possible between the two, but these will be deeply nested objects so it has to be robust. I was looking at Dozer for my mapping needs. Previously I've used EJB3 with TopLink, so that's very familiar to me, but I would like to get community input on what other API's work well with Dozer and GWT.

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• Validate password on change of certain fields in RoR

  - by Micke

  Hello, I am building a RoR app, a community. With a User model and some fields. So when a user is updating a certain field, like His/Hers berthday. Then i want to validate that the User typed in the password that is the same in the Database. So I know that it is the right user trying to change the birthday. So i ask you how i can create shuch a validator. Allso i would like to be able to specify an array of which fields the user has to validate the password to change. Ps. I am using RoR3. If it mathers. Thanks, Micke

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• Most useful Rails plugins, Ruby libraries and Ruby gems?

  - by Srinivas Iyer

  I have seen many sites which provide the whole list of Rails plugins, Ruby libraries and Ruby gems, but we hardly use few of them and some may not suit our requirement and we spend a whole lot of time searching for useful plugins which suits our requirement. I have created this poll, people can post useful libraries, gems and plugins which they have come across. It would be great help for newbies like me and to the entire Ruby on Rails community. Note: to keep this poll as useful as possible, please remember: Post only one library, gem, or plugin per answer Mention the name of the library, gem, or plugin which you find it useful. URL of the location of the resource We don't want duplicate answers, so before posting check if the library has been mentioned already. Thanks

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