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• What is a de-compiler how does it work?

  - by thyrgle

  So is a decompiler really a thing that gives gives the source of a compiled/interpreted piece of code? Because to me that sounds impossible. How would you get the names of the functions, variables, classes, etc if it is compiled. Or am I misinterpreting the definition? How does it work? And what is the general principal behind making one?

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• OpenMP implementations in VC++ 2008, 2010

  - by John

  Depending on implementation, OMP can be quite useful to parallelize fairly arbitrary bits of code - e.g a parallel section inside a method that calls two independent methods - or it can be bad. It depends on how threads are created/cached, I think. How does the VC++ 2008 implementation work? And is the 2010 implementation significantly different in terms of features and performance/flexibility?

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• How to automate the padding for arbitary images using MatLab?

  - by user198729

  This is a further question based on this answer: http://stackoverflow.com/questions/2589851/how-can-i-implement-this-visual-effect-in-matlab/2589957#2589957 The general solution should work for all background colors and length/width ratio.

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• Best way to display a background with a pattern in an iPhone/iPad app

  - by Dr Dork

  Here's an example of the type of background image I'm talking about... Clearly, there's a pattern in it. My question is, if this were an iPad app and the background image was twice the size, would there be any significant benefits to taking advantage of this pattern by tiling the image? Or would it really make no difference in terms of performance and just be easier to load the entire image into a UIImageView? Thanks in advance for all your wisdom!

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• Trigger action when element is clicked but not when some specific subelements are.

  - by Anant

  I have a div, containing text and a few links. I want to trigger an onclick event, only if the click occurs anywhere in the div, but not on any of the links. What would be the best way (performance wise) to implement this using jQuery? The one I use is $('#div').click(function(){ }); but it disables all the #div a

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• Client Server Communication and Persistence Frameworks

  - by soontobeared

  Hi, When using Persistence frameworks like Hibernate, JPA etc. on the server side, what are the general practices of passing on the data between client and server ? Are there any existing design patterns for the same ? Thanks.

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• How do i run the Android command line tools?

  - by fordays

  I'm still pretty new to Android and programming in general, and I can't seem to get the command line tools packaged with the Android SDK to work. I'm running Mac OSX and each time I try to run layoutopt, for example, the terminal returns, *-bash: cmd: command not found * Also, is it okay to have my SDK located in the Developer directory and my android project in some unrelated directory when using these tools?

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• Better way to ignore exception type: multiple catch block vs. type querying

  - by HuBeZa

  There are situations that we like to ignore a specific exception type (commonly ObjectDisposedException). It can be achieved with those two methods: try { // code that throws error here: } catch (SpecificException) { /*ignore this*/ } catch (Exception ex) { // Handle exception, write to log... } or try { // code that throws error here: } catch (Exception ex) { if (ex is SpecificException) { /*ignore this*/ } else { // Handle exception, write to log... } } What are the pros and cons of this two methods (regarding performance, readability, etc.)?

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• Way to identify a particular exception from exception class

  - by Jibu P C_Adoor

  Hiii. Is there any way to uniquely identify a particular exception from the general exception class. i.e any property or method that retrieves a unique identifier that to identify a particular exception.

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• Is ArrayList.size() method cached?

  - by Peterdk

  I was wondering, is the size() method that you can call on a existing ArrayList<T> cached? Or is it preferable in performance critical code that I just store the size() in a local int? I would expect that it is indeed cached, when you don't add/remove items between calls to size(). Am I right?

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• SQL Server Update Group by

  - by Gerardo Abdo

  I'm trying to execute this on MS-SQL but returns me an error just at the Group by line update #temp Set Dos=Count(1) From Temp_Table2010 s where Id=s.Total and s.total in (Select Id from #temp) group by s.Total Do anyone knows how can I solve this problem having good performance.

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• Is Area what I am looking for?

  - by Dejan.S

  Hi I'm new to MVC2 or MVC in general. I'm gone do basic app with a backend. Now I been thinking about how I should do with the folders, views, controllers & routes for the AdminFolder. Now I just saw something called Areas. Is that a way to go for me?

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• Does the number of rows in mysql table matter?

  - by 1s2a3n4j5e6e7v

  I'm coming up with a web app which will want me to store more than 80 Lakh (8 million) rows. Will it be fine to handle those many number of rows with MySQL without having any performance degradation? Assume my RAM to be 4 GB and Infinity GB Harddisk space. Also, the main fields have been indexed.

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• Simple PHP form Validation and the validation symbols

  - by Cool Hand Luke UK

  Hi have some forms that I want to use some basic php validation (regular expressions) on, how do you go about doing it? I have just general text input, usernames, passwords and date to validate. I would also like to know how to check for empty input boxes. I have looked on the interenet for this stuff but I haven't found any good tutorials. Thanks

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• Array, find object with value and get its indexPath

  - by Emil

  Hey. I am trying to find an item in a NSMutableArray from it's value, only to find its indexPath. I have absolutely no idea of how to do this, as I am very new to programming in general. Thanks!

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• What was the most refreshingly honest non-technical comment you saw in the code?

  - by DVK

  OK, so we all saw the lists of "funny" or "bad" comments. However, today, when maintaining an old stored proc, I stumbled upon a comment which I couldn't classify other than "refreshingly brutally honest", left by a previous maintainer around a really freakish (both performance and readability-wise) page-long query: -- Feel free to optimize this if you can understand what it means So, in the first (and hopefully only) poll type question in my history of Stack Overflow, I'd like to hear some other "refreshingly brutally honest" code comments you encountered or written.

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• How to convert any possible format to UTF-8 using Iconv?

  - by Ole Jak

  so for example this will turn 1251 into utf-8. $utf8 = iconv('windows-1251', 'utf-8', $ansi); But how to turn unknown (when it comes to us we do not know yet what format it is) ( in general any ) format (possibly known by Iconv ) to utf-8?

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• Rails callback for the equivalent of "after_new"

  - by Joe Cairns

  Right now I cant find a way to generate a callback between lines 1 and 2 here: f = Foo.new f.some_call f.save! Is there any way to simulate what would be effectively an after_new callback? Right now I'm using after_initialize but there are potential performance problems with using that since it fires for a lot of different events.

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• Stored procedures vs. parameter binding

  - by Gagan

  I am using SQL server and ODBC in visual c++ for writing to the database. Currently i am using parameter binding in SQL queries ( as i fill the database with only 5 - 6 queries and same is true for retrieving data). I dont know much about stored procedures and I am wondering how much if any performance increase stored procedures have over parameter binding as in parameter binding we prepare the query only once and just execute it later in the program for diferent set of values of variables.

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• Is there a downside to adding an anonymous empty delegate on event declaration?

  - by serg10

  I have seen a few mentions of this idiom (including on SO): // Deliberately empty subscriber public event EventHandler AskQuestion = delegate {}; The upside is clear - it avoids the need to check for null before raising the event. However, I am keen to understand if there are any downsides. For example, is it something that is in widespread use and is transparent enough that it won't cause a maintenance headache? Is there any appreciable performance hit of the empty event subscriber call?

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• Searching for SD-cards

  - by Shaddix

  I need to implement searching for SD-cards in my program. Currently I'm using search for all removable devices like: searcher = New Management.ManagementObjectSearcher("\\localhost\root\cimv2", "SELECT DeviceId FROM Win32_LogicalDisk WHERE DriveType=2 AND Size>0"); But it find USB flash drives also. Is there a proper way to find SD-cards only? What I need is in general only drive letter for available SD-cards (like "F:" or so).

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• What are your feelings on JavaFX?

  - by ForYourOwnGood

  I currently do a lot of work in ActionScript 3.0, I also love to program in Java. Is JavaFX perfect for me? What is the general feeling on JavaFX, will it become a power house, or go down the same path as Java Applets? Could the designers I work with become comfortable with JavaFX to the same extent they are comfortable with ActionScript and JavaScript?

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• Multithreading, when to yield versus sleep

  - by aaa

  hello. To clarify terminology, yield is when thread gives up its time slice. My platform of interest is POSIX threads, but I think question is general. Suppose I have consumer/producer pattern. If I want to throttle either consumer or producer, which is better to use, sleep or yield? I am mostly interested in efficiency of using either function. Thanks

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• '/usr/lib/mozilla/plugins/npPluginTest.so' is not an ELF executable for sh

  - by rakesh nair

  I have created NPAPI plugin, which is workig fine on linux where I have created the .so file but when I deployed this plugin on our production device where we have linux environment with limited resources(due to performance constraints) , following error is thrown '/usr/lib/mozilla/plugins/npPluginTest.so' is not an ELF executable for sh FYI:so file created on 32bit linux box. how can I resolve this issue?

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• What design pattern should be used to create an emulator?

  - by Facon

  I have programmed an emulator, but I have some doubts about how to organizate it properly, because, I see that it has some problems about classes connection (CPU <- Machine Board). For example: I/O ports, interruptions, communication between two or more CPU, etc. I need for the emulator to has the best performance and good understanding of the code. PD: Sorry for my bad English.

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