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  • autosave pattern

    - by Mark
    I'm using localstorage to do gmail-style autosave on a webpage. So I basically save every 30 seconds to local, OK. The problem is recovery. I can't detect whether or not a user has crashed or incorrectly exited. So let's say the user crashed and loads up the form again, I can't just continue saving and overwriting the previous autosaves. I need to restore the previous save. But let's say the user didn't crash. He did everything correctly, but then used a different browser to edit the same file, so no new data to the previous browser's localstorage. He then loads up the file in the previous browser. The localstorage should not be restored in that case. Assuming there's no way to compare timestamps, how can I solve this problem? Thanks.

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  • Released object crashes app

    - by John Smith
    I am using objective-C++ (+Boost) for iPhone development. I am in a rather tight loop and need to allocate and release a certain object. The code is something like this. for (int i=0;i<100;i++) { opt = [[FObj alloc] init]; //do stuff with opt [opt release]; } The FObj object is something like @interface FObj MyCPPObj * cppobj; @end In the implementation of FObj there is a dealloc method: -(void) dealloc { delete cppobj; //previously allocated with 'new' [super dealloc]; } I am afraid that if i don't release then the 'MyCPPObj's will just pile up. But releasing makes the app crash after the first loop. What am I doing wrong? Or perhaps should I make cppobj and boost::shared_ptr? (do boost shared pointers automatically release their objects when an objective-C++ object is deleted?)

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  • Is Private Bytes >> Working Set?

    - by Jacob
    OK, this may sound weird, but here goes. There are 2 computers, A (Pentium D) and B (Quad Core) with almost the same amount of RAM running Windows XP. If I run the same code on both computers, the allocated private bytes in A never goes down resulting in a crash later on. In B it looks like the private bytes is constantly deallocated and everything looks fine. In both computers, the working set is deallocated and allocated similarly. Could this be an issue with manifests or DLLs (system)? I'm clueless. Note: I observed the utilized memory with Process Explorer. Question: During execution (where we have several allocations and deallocations) is it normal for the number of private bytes to be much bigger (1.5 GB vs 70 MB) than the working set?

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  • Is it OK to run an array with 22k strings in a PHP code on a shared web host?

    - by kuchikoo
    I'm new to writing code so kindly bear with me if this is a very noobish question. A couple of days back I asked a question about a PHP code that matches the the query entered by users on my website to an array stored within the PHP code and displays the matched queries. Here is the code I'm talking about Now I've ended up with a rather large list (over 22k) of strings that have to be stored in the array. Is it ok to run it like this? I'm hosting the site on a shared hostgator package, will this cause my site to crash? I don't know too much about DBs but can I somehow store this on MySQL instead of having it in the code?

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  • How can I debug a Perl program that suddenly exits?

    - by taw
    I have Perl program based on IO::Async, and it sometimes just exits after a few hours/days without printing any error message whatsoever. There's nothing in dmesg or /var/log either. STDOUT/STDERR are both autoflush(1) so data shouldn't be lost in buffers. It doesn't actually exit from IO::Async::Loop->loop_forever - print I put there just to make sure of that never gets triggered. Now one way would be to keep peppering the program with more and more prints and hope one of them gives me some clue. Is there better way to get information what was going on in a program that made it exit/silently crash?

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  • HRESULT exception not caught in VS 2008

    - by arionik
    Hello all, I've got a stange situation in visual studio 2008 C++. I work on code that was originally written for visual studio 2003, where everything works well. Now, ported to VS 2008, the exception handling, which unfortuantely exists widely in the code, does not work anymore. standard code example: try { HRESULT hr = S_OK; // do stuff... if( FAILED( hr ) ) throw hr; } catch( HRESULT hr ) { // error handling, but we never get here } catch( ... ) { // ... not even here } Under VS 2008, no exception is encountered, but I get a crash somewhere else, indicating that the stack pointer must be screwed up. Did anybody come across this behaviour? Any help is appreciated.

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  • how to construct a long string

    - by david
    I need to construct a long string with javascript. Thats how i tried to do it: var html = '<div style="balbalblaba">&nbsp;</div>'; for(i = 1; i <= 400; i++){ html=+html; }; When i execute that in firefox its taking ages or makes it crash. what is the best way to do that? What is generally the best way to construct big strings in JS. can someone help me?

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  • Which computing publisher has the best refereed research resources for the working programmer?

    - by Stephen
    When I have a problem I often search the computing literature. Some of the resources[*] I use are: The professional associations? ACM Digital Library IEEE Xplore The scientific publishers? Lecture Notes in Computer Science HCI Bibliography What do you use? What is the best resource source (if there is one) for the working programmer? [*] after stackoverflow and google of course :) PS what tags should I use for this question?

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  • Potential leak of an object allocated

    - by idober
    Using the build and analyze of XCode I saw i have a memory leak in my code: - (NSString *) doIt { NSString *var = [[NSString alloc] init]; return var; } This is of course a simplified snippet of my problem where do i release the object?

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  • New job clarification [closed]

    - by Fred
    Lets say you have decided to join company A. During interview you got feedback on what technology you would be working on(C# win app) and other details( sketchy).Now you have decided to join the company. Is it ok to ask via mail for further information and also ask to specify certain topics to brush up so that one can be better prepared for next job? Of course i know this question is not programming related.

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  • "Share this on..." URLs

    - by Andrea
    I have to create a bunch of these "Share this on" Technorati, Digg, Facebook, Reddit, del.icio.us, StumbleUpon, MySpace and so on. It is very easy to find online icons for this task, but it is a little more difficult to find what URLs I should link. Is there any updated list of all these services? Of course I could copy them from other sites having this, but I am not sure they are updated, and moreover maybe there is some GET parameter I want to set differently.

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  • Weird constants

    - by Quassnoi
    I've seen these in real code: #define SCREEN_DIMENSIONS 2 #define THREE_THOUSAND_FIVE_HUNDRED_TWENTY_TWO 3522 What is the weirdest constant you've ever seen? P. S. And of course my favorite in JScript: bool b; switch (b.ToString().length) { case 4: // true ... break; case 5: // false ... break; )

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  • Is there a better alternative to the Mongo shell?

    - by afvasd
    Dear Everyone, Is there a better shell than the native mongo shell? When I press UP I am seeing ^[[A . Does the shell not support last query? Tabbing in the shell does not autocomplete either. Of course, if there's a shell with syntax highlighting that would be great Is there an alternative that has the following features? (Or at least has some of them).

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  • How to login users that are stored within a Wordpress account

    - by user3716795
    I am developing an iOS app that is password protected and all the users are stored in a wordpress account that, of course, is password protected as well. Does anybody know the format that wordpress uses to store login information for these accounts, I would assume that it is a MySQL that sends a json? I have only been able to find the database code for the initial admin page but nothing that shows the way these accounts (815 to be exact) would be stored within the site.

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  • Floating point arithmetics restricted to integers

    - by user396672
    I use doubles for a uniform implementation of some arithmetic calculations. These calculations may be actually applied to integers too, but there are no C++-like templates in Java and I don't want to duplicate the implementation code, so I simply use "double" version for ints. Does JVM spec guarantees the correctness of integer operations such a <=,=, +, -, *, and / (in case of remainder==0) when the operations are emulated as corresponding floating point ops? (Any integer, of course, has reasonable size to be represented in double's mantissa)

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  • Samples of Scala and Java code where Scala code looks simpler/has less lines?

    - by Roman
    I need some code samples (and I also really curious about them) of Scala and Java code which show that Scala code is more simple and concise then code written in Java (of course both samples should solve the same problem). If there is only Scala sample with comment like "this is abstract factory in Scala, in Java it will look much more cumbersome" then this is also acceptable. Thanks!

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  • Creating an instance within the Class itself

    - by didxga
    What's going on when the assignment statement executed at Line 4, does compiler ignore the new operator and keep the foo variable being null or something else happen to handle this awkward moment? public class Foo { // creating an instance before its constructor has been invoked, suppose the "initializing" // gets printed in constructor as a result of the next line, of course it will not print it private Foo foo = new Foo();//Line 4 public Foo() { System.out.println("initializing"); } }

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  • Switching to Java from C++: What are the key points?

    - by Roddy
    I'm an experienced developer, but most of my OO programming experience has been with C++ (and a little Delphi). I'm considering doing some Android work, hence Java. Coming from the C++ background, what areas of Java are most likely to surprise/annoy/delight me? I felt sure this would already have been asked, but my searches haven't turned up a similar question. CW, of course.

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  • tortoisesvn - Error REPORT request failed on ../../../!svn/vcc/default

    - by John
    Users attempting to check out files from a particular Subversion 1.4.x repository with Apache 2.2 on Windows 2003 have suddenly begun getting an error message in their log windows upon checkout with TortoiseSVN 1.4: Error REPORT request failed on '/[path_to_repo]/!svn/vcc/default' Error REPORT of '/[path_to_repo]/!svn/vcc/default': 200 OK (http://[server_name]) This started following an hd crash on the server and subsequent restore of about 10 subversion repositories. Only one repository is having this problem after an attempted working directory reconciliation. The repo owner reconcile their working directory with the repository by modifying/deleting the hidden .svn directories (though this was not advised). I can't find anything on the Internets that represents my situation. The restored server is exactly as the original and no other repositories on this server are throwing errors. Any ideas on 1) what this error is and 2) how to fix it?

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  • Learn C++ after learning C#

    - by RichK
    I'm developing a library in C# at the moment and recently bought a great book to help me out but the code snippets are in C++. Does anyone have a link to a site/PDF that'll give me a crash course in C++? (mainly the syntax rather than pros/cons etc) because I'll be developing in C# but things like -, ::, &, **, are giving me the shivers. Obviously the languages aren't 100% compatible but if I know what the C++ is doing from a 'theoretical' point of view I can make a stab at rewriting it in C#. I've had a Google to find the answer but all the sites seem to be "Should I use C++ or C#?", which isn't any good to me. Thanks in advance.

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  • Cannot make sense out a Delphi windows file name

    - by Philippe Watel
    I am trying to copy from a file X to this name C:\RIP2\France Clidat\Les Plus Belles Oeuvres - France Clidat\(01)3_ Un Sospiro.flac I have checked that there is no bad characters, If I force directorires it creates C:\RIP2\France Clidat\Les Plus Belles Oeuvres - France Clidat but it refuses to write the file and I do not understand why a simple test procedure foo(str: string); var f:File; begin Assign(f,str); Rewrite(f); CloseFile(f); end; will crash saying it is not a valid file name but it is! If I remove ALL blank spaces it works I am lost please Help

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  • SVN tags: How not to update/checkout them?

    - by Boldewyn
    In many projects, I check out the complete repository and have then the standard directory structure: project/ branches/ tags/ trunk/ If I do an svn up project, it's all fine with the branches and trunk folders, but, of course, the tags folder is updated, too, and filled with (mostly) lots of tagged versions that are of no value for my work and only occupy disk space. How can I except the tags folder from an svn update? Especially, how can I do this locally only, that is, without committing that back to the repository, as a solution with the svn:ignore keyword would do?

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