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• PHP - white screen of death!

  - by Industrial

  Hi everyone, After debugging a codeigniter app that were installed into a new development environment, I have started to freak out when seeing white screens with nothing more available. I have been able to solve each and every one of the errors that have caused this, but it have taken seriously way too long time. PHP error_reporting(E_ALL) & display_errors", 1 is set as well. I even installed Xdebug in hope of getting more output, but no. My logging settings are also working, but nothing is written to the log. Is there a way to get something informative printed out instead of a complete white screen? It would certainly shorten my time spent on solving the eventual errors that causes this? Thanks a lot! Reference: http://stackoverflow.com/questions/2149321/why-does-code-igniter-give-me-a-white-page

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• Rails: find_by_sql and PREPARE stmt FROM... i cant make it work

  - by Totty

  I have this query and I have an error: images = Image.find_by_sql('PREPARE stmt FROM \' SELECT * FROM images AS i WHERE i.on_id = 1 AND i.on_type = "profile" ORDER BY i.updated_at LIMIT ?, 6\ '; SET @lower_limit := ((5 DIV 6) * 6); EXECUTE stmt USING @lower_limit;') Mysql::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET @lower_limit := ((5 DIV 6) * 6); EXECUTE stmt USING @lower_limit' at line 1: PREPARE stmt FROM ' SELECT * FROM images AS i WHERE i.on_id = 1 AND i.on_type = "profile" ORDER BY i.updated_at LIMIT ?, 6'; SET @lower_limit := ((5 DIV 6) * 6); EXECUTE stmt USING @lower_limit; EDIT: after finding the answer to: http://stackoverflow.com/questions/2566620/mysql-i-need-to-get-the-offset-of-a-item-in-a-query i need another help here to port it to rails.

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• Why is writing a compiler in a functional language so efficient and easier?

  - by wvd

  Hello all, I've been thinking of this question very long, but really couldn't find the answer on Google as well a similar question on Stackoverflow. If there is a duplicate, I'm sorry for that. A lot of people seem to say that writing compilers and other language tools in functional languages such as OCaml and Haskell is much more efficient and easier then writing them in imperative languages. Is this true? And if so -- why is so efficient and easy to write them in functional languages instead of in an imperative language, like C? Also -- isn't a language tool in a functional language slower then in some low-level language like C? Thanks in advance, William v. Doorn

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• Why is writing a compiler in a functional language easier?

  - by wvd

  Hello all, I've been thinking of this question very long, but really couldn't find the answer on Google as well a similar question on Stackoverflow. If there is a duplicate, I'm sorry for that. A lot of people seem to say that writing compilers and other language tools in functional languages such as OCaml and Haskell is much more efficient and easier then writing them in imperative languages. Is this true? And if so -- why is it so efficient and easy to write them in functional languages instead of in an imperative language, like C? Also -- isn't a language tool in a functional language slower then in some low-level language like C? Thanks in advance, William v. Doorn

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• Do Managers in Python Multiprocessing module lock the shared data?

  - by AnonProcess

  This Question has been asked before: http://stackoverflow.com/questions/2936626/how-to-share-a-dictionary-between-multiple-processes-in-python-without-locking However I have several doubts regarding the program given in the answer: The issue is that the following step isn't atomic d['blah'] += 1 Even with locking the answer provided in that question would lead to random results. Since Process 1 read value of d['blah'] saves it on the stack increments it and again writes it. In Between a Process 2 can read the d['blah'] as well. Locking means that while d['blah'] is being written or read no other process can access it. Can someone clarify my doubts?

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• Python unittest with expensive setup

  - by Staale

  My test file is basically: class Test(unittest.TestCase): def testOk(): pass if __name__ == "__main__": expensiveSetup() try: unittest.main() finally: cleanUp() However, I do wish to run my test through Netbeans testing tools, and to do that I need unittests that don't rely on an environment setup done in main. Looking at http://stackoverflow.com/questions/402483/caching-result-of-setup-using-python-unittest - it recommends using Nose. However, I don't think Netbeans supports this. I didn't find any information indicating that it does. Additionally, I am the only one here actually writing tests, so I don't want to introduce additional dependencies for the other 2 developers unless they are needed. How can I do the setup and cleanup once for all the tests in my TestSuite? The expensive setup here is creating some files with dummy data, as well as setting up and tearing down a simple xml-rpc server. I also have 2 test classes, one testing locally and one testing all methods over xml-rpc.

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• EntityFramwork System.OutOfMemoryException on 100MB upload

  - by Win

  Upload works fine for 62MB file. However, it throws exception if it is 100MB. I found few questions in stackoverflow, but none is very specific about datatype. Appreciate your help! ASP.Net 4, IIS7, EntityFramework 4.1, Visual Studio 2010 SP1, SQL 2008 DataType is varbinary(max) applicationHost.config <section name="requestFiltering" overrideModeDefault="Allow" /> web.config <httpRuntime maxRequestLength="1148576" executionTimeout="3600"/> <security > <requestFiltering> <requestLimits maxAllowedContentLength="112400000" /> </requestFiltering> </security>

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• Rake migration aborted

  - by user2537714

  I'm running Ruby 2.0.0 and I installed it correctly. Just loaded up a gem 'devise' and as I tried to migrate my database changes, it wouldn't work: $ rake db:migrate rake aborted! attr_accessible is extracted out of Rails into a gem. Please use new recommended protection model for params(strong_parameters) or add protected_attributes to your Gemfile to use old one. Then, following another Stackoverflow post, they recommended installing Bundler. I did that successfully and got this: $ bundle exec rake db:migrate rake aborted! attr_accessible is extracted out of Rails into a gem. Please use new recommended protection model for params(strong_parameters) or add protected_attributes to your Gemfile to use old one. Is anyone up to the challenge to help?

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• What is the response on a REST call where a field is not valid?

  - by MediaSlayer

  There are many questions on StackOverflow about this, but no definitive answer. I have a REST resource where an entity's field, ProductId, is sent. If the ProductId passed is invalid, what kind of response would you do? I want to send the right response code plus information to the requester on what they can do to fix it. Initial thoughts were 422 with the body containing the list of errors in JSON/XML format. Maybe like this (JSON): [ { FieldName : "ProductId", ErrorCode : "M123", Description : "Product Not Found" }, { FieldName : "Quantity", ErrorCode : "Q001", Description : "Quantity cannot be more than 100" } ] Thoughts?

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• Code snippet manager suggestions

  - by dave

  I'm looking for a code snippet manager per the following: Usable on Windows stand-alone product desktop-based (not online) Free or paid Has PHP syntax highlighting I've found the following, but they don't seem to quite ring the bell (although they are good products): -- Snip-It Pro (not free) -- Has syntax highlighting, but seems "not there yet." -- The Guide (free: SourceForge) Tree-based info manager, no syntax highlighting. -- ActionOutline (free, upgrade not free) Tree-based info manager, no syntax highlighting. There have been questions about this before on stackoverflow, but the last one was over a year ago (over 400 answers), which is where I got the products listed above. Just wondering if I've overlooked anything produced more recently. Thanks for any help.

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• Why is PHP date() adding +1 hour in diff calculation?

  - by Lex

  Hi there, I've got kind of a tricky question, I already searched every related question on Stackoverflow and neither solved my conundrum, although I think I'm running in circles, so here's the question: I've got this code: $val = (strtotime('2010-03-22 10:05:00')-strtotime('2010-03-22 09:00:00')) This returns correctly $val = 3900 (3600 seconds = 1 hour, 300 seconds = 5 mins) But doing this: echo date("H:i",$val)."<br>"; returns 02:05 even doing this: echo date("H:i",3900)."<br>"; returns 02:05 (just to be naively sure) Doing this: echo date("H:i eTO",3900)."<br>"; returns 02:05 System/LocaltimeCET+0100 Which is correct, my timezone is CET and is +1. What's going on? Is date() correcting the timezone for some reason? Or am I doing anything wrong?

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• a Facebook app beginner question

  - by Robert

  Dear all, I have written up my first php script to learn facebook API stuff.It goes like this: require_once('facebook/client/facebook.php'); $facebook = new Facebook('0fff13540b7ff2ae94be38463cb4fa67','8a029798dd463be6c94cb8d9ca851696'); http://stackoverflow.com/questions/ask $fb_user = $facebook-require_login(); ? Hello ' useyou='false' possessive='true' /! Welcome to my first application! I put "facebook.php" in the same directory as my php script. However,after I deploy the php on a web server and link it with facebook and run it,I got error saying: "Fatal error: Call to undefined method Facebook::require_login() in /home/a2660104/public_html/facebook-php-sdk-94fcb13/src/default.php on line 16" Could anyone help me a bit on this?I am a beginner to the facebook app programming.Thanks a lot!

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• How to Debug Java Application using VIM/GVIM?

  - by Techmaddy

  I asked this question previously: http://stackoverflow.com/questions/495268/any-good-tutorial-for-moving-from-eclipse-to-vim From the inputs, I started using GVIM instead of Eclipse. I added ctags to it and I am able to navigate now comfortably. Only problem left for me is "Debugging"? I tried searching for some links, and couldn't a useful one? If anyone using or familiar with Java Debugging using vim/Gvim, can provide there inputs/ links/ tutorials, it would be very helpful. Thanks in advance.

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• What are the exact versions of stuff you have to install in order to be able to step-debug a Scala p

  - by Alex R

  How do YOU debug a Scala program? I mean YOU as in the person posting the Answer :) Please answer only from personal experience, not from stuff you've heard or read on the Internet. You should not believe everything you read on the Internet, especially tales of complex open-source software configurations that actually work :-) The are many Java tools which claim to support Scala in some way or another, but I have so far struck out in trying to get any one of them to actually let me set a breakpoint in Scala code and step through it. These are big, major open-source IDEs I'm talking about here. The main problem in getting a debugger to work seems to be the "version hell" with fast-changing IDEs, Plug-Ins, JDKs, and the Scala language itself. Hence, the more detailed re-statement of the question is appropriate: What is the exact version number of the IDE, Plug-In, JDK, Scala, and even Operating System, that you are successfully using? My question is related to this one, but wider in scope: http://stackoverflow.com/questions/2272705/how-to-debug-scala-code-when-outside-of-an-ide Thanks

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• How Likely Is It That I'll Get Sued Developing Software?

  - by yar

  It has been a practically unanimous truth on StackOverflow that if you work as an independent consultant, you should probably form a corporation (as seen here), to limit personal liability, supposedly to protect you in case of lawsuit. It seems to me that developing software does not result in many lawsuits, but this is an empirical (objective [and not community wiki]) question: How likely is it that a lone software developer will be sued? Also, by whom (a disgruntled company, coworker)? Since incorporating is basically taking out insurance, the likelihood of catastrophe needs to be taken into account. Also, aren't there standard laws covering, for example, total screw-ups with corporate data that mean that protect the lone cowboy/girl/person/coder?

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• A Combinations of Items in Given List

  - by mecablaze

  Hello stackoverflow, I'm currently in Python land. This is what I need to do. I have already looked into the itertools library but it seems to only do permutations. I want to take an input list, like ['yahoo', 'wikipedia', 'freebase'] and generate every unique combination of one item with zero or more other items... ['yahoo', 'wikipedia', 'freebase'] ['yahoo', 'wikipedia'] ['yahoo', 'freebase'] ['wikipedia', 'freebase'] ['yahoo'] ['freebase'] ['wikipedia'] A few notes. Order does not matter and I am trying to design the method to take a list of any size. Also, is there a name for this kind of combination? Thanks for your help!

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• How to fetch, display Amazon Marketplace listings by item?

  - by Matt G.

  Hi all, My question pretty much says it all: I'm looking for a way to display Amazon Marketplace listings based on an item lookup. Example: If I do a call to ItemLookup with an ASIN of 0590353403 (Harry Potter and the Sorcerer's Stone), I'm looking for a result set of perhaps the top ten new or used Marketplace listings, preferably with seller information attached. I apologize if this is clearly documented somewhere, but I have been looking all through the Amazon API docs and on Google to no avail. StackOverflow doesn't seem to have any Related Questions that match what I'm asking, either. Thanks in advance!

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• How to handle multiple projects in a small team

  - by meo

  We just started to use scrum for our project management. We are a very small team (2 developers, 1 UI/Web-deisgner ) and we have a lot of running projects at once. How do you handle having multiple projects running at once in the scrum model? Most of the time we have a main projects and some small ones. How do you combine multiple sprints efficiently? PS: I'm not sure stackoverflow is the right place to ask this kind of question, i hope there is a scrum master out there reading this.

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• How can I "interconnect" two sockets in Linux?

  - by Vi

  There are two connected sockets. How can I interconnect them? Data appeared on the one socket should be written to the other. EOF/FIN should propogate well. If one is half-closed, the other should also be half-closed. int client = get_connected_client_socket(); int proxy = get_connected_proxy_socket(); negotiate_with_proxy(proxy); iterconnect(client, proxy); // Now forgot about both client and proxy. // System should handle IO/shutdown/close. // Ideally even without any support of the user-space process. Can Linux do it? Can it be done by tricking connection tracking to change tracking status of existing connection? @related http://stackoverflow.com/questions/2673975/determine-how-much-can-i-write-into-a-filehandle-copying-data-from-one-fh-to-the

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• SRAM Cell Diagram - Can someone explain this a bit more clearly? ( From COMP1917 @ UNSW: Lecture 2 o

  - by Kristina

  I've begun watching a series of first year lectures from the University of New South Wales (UNSW) in Australia, and I'm a bit perplexed by the instructors explanation of how an SRAM gate works. I realize this isn't exactly "programming-related" but since it comes from a series of lectures relating to computing and programming, I thought StackOverflow may be able to help (reddit failed me entirely). In this lecture beginning at around 32:12, Richard (the lecturer) tries to explain how a "latch gate" works within SRAM. Although his students seem to keep up, I feel I'm missing something crucial which is preventing the concept from really "clicking" in my brain. For convenience, I've added the image from the video below: Thanks in advance for any help you can provide, but if this question doesn't fit your view of "programming-related" could you please provide an alternate forum for this in a comment when you cast your close vote? Thanks!

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• How do you find the balance between Javascript (jQuery) and code behind in ASP.NET.

  - by PieterG

  Stackoverflow members, How do you currently find the balance between javascript and code behind. I have recently come across some extremely bad (in my eyes) legacy code that lends itself to chaos (someHugeJavafile.js) which contains a lot of the logic used in many of the pages. Let's say for example that you have a Form that you need to complete. 1. Personal Details 2. Address Information 3. Little bit more about yourself You don't want to overload the person with all the fields at once, so you decide to split it up into steps. Do you create separate pages for Personal Details, Address Information and a Little bit more about yourself. Do you create controls for each and hide and show them on a postback or using some update panel? Do you use jQuery and do some checking to ensure that the person has completed the required fields for the step and show the new "section" by using .show()? How do you usually find the balance?

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• JavaApplicationStub with CFBundleDocumentTypes

  - by mystro

  I'm trying to use CFBundleDocumentTypes to associate a custom file extension with my application. As far as I can tell, this seems to "work" -- my application launches when I double click the file. However, no callback is registered through the ApplicationListener events I setup in java. I used the code listed in http://stackoverflow.com/questions/1460193/set-default-file-association-mac-os-x-java-package-maker-installer to do the file association, and the file association itself appears fine, but it seems as if it is the application stub trying to launch the file, and thus fails. I added the Apple ApplicatinListener code to my java application at (similar to http://developer.apple.com/mac/library/documentation/Java/Reference/1.5.0/appledoc/api/index.html?com/apple/eawt/Application.html) but it doesn't seem like my application ever gets a call back. the code is similar to Application.getApplicatin().addApplicationListener( new ApplicationAdapter() { public void handleOpenFile(ApplicationEvent evt) { //some logging message here that I never get} }); Any help would be appreciated

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• JavaApplicationStub with CFBundleDocumentTypes

  - by mystro

  I'm trying to use CFBundleDocumentTypes to associate a custom file extension with my application. As far as I can tell, this seems to "work" -- JavaApplicationStub launches my application when I double click the file. However, no callback is registered through the ApplicationListener events I setup in java. I used the code listed in http://stackoverflow.com/questions/1460193/set-default-file-association-mac-os-x-java-package-maker-installer to do the file association, and the file association itself appears fine, but it seems as if it is the application stub trying to launch the file, and thus fails. I added the Apple ApplicatinListener code to my java application at (similar to http://developer.apple.com/mac/library/documentation/Java/Reference/1.5.0/appledoc/api/index.html?com/apple/eawt/Application.html) but it doesn't seem like my application ever gets a call back. the code is similar to Application.getApplicatin().addApplicationListener( new ApplicationAdapter() { public void handleOpenFile(ApplicationEvent evt) { //some logging message here that I never get} }); I should perhaps mention that I'm also using SWT... Any help would be appreciated

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• Can I wrap a long filename?

  - by user54197

  I have a table in a fieldset that is not displayed properly (overflow) because of a long file name that I cannot wrap. Is there a way to wrap the file name that is in the table? <table> <tr><td>stackoverflow.com/questions/4584756/how-can-i-make-the-datagridviewtextboxcolumn-wrap-to-a-new-line-if-its-text-is-t</td></tr> </table> I set the width and overflow style on the element and still no help. Any other ideas?

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• Java escape HTML - string replace slow?

  - by cpf

  Hi StackOverflow, I have a Java application that makes heavy use of a large file, to read, process and give through to SolrEmbeddedServer (http://lucene.apache.org/solr/). One of the functions does basic HTML escaping: private String htmlEscape(String input) { return input.replace("&", "&amp;").replace(">", "&gt;").replace("<", "&lt;") .replace("'", "&apos;").replaceAll("\"", "&quot;"); } While profiling the application, the program spends roughly 58% of the time in this function, a total of 47% in replace, and 11% in replaceAll. Now, is the Java replace that slow, or am I on the right path and should I consider the program efficient enough to have its bottleneck in Java and not in my code? (Or am I replacing wrong?) Thanks in advance!

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