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• What is the performance difference between blocks and callbacks?

  - by Don

  One of the things that block objects, introduced in Snow Leopard, are good for is situations that would previously have been handled with callbacks. The syntax is much cleaner for passing context around. However, I haven't seen any information on the performance implications of using blocks in this manner. What, if any, performance pitfalls should I look out for when using blocks, particularly as a replacement for a C-style callback?

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• doublebuffering not reducing the flicker

  - by fishhead

  I am drawing an grid-work of objects in a Panel. when I scroll the the panel quickly I get a flicker. I thought that enabling the double buffering may take care of this but what I find is that it does not completely draw everything and I am left with blank sections. could anyone give me suggestions as to what may be happening and how I might correct it. UPDATE: I found that I was creating the graphics object with Creategraphics() rather than using the Parameter in the paint method

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• Is String.concat slower than Array approach to join strings

  - by Rajat

  Strings in JavaScript are immutable. Across the web and here on Stack Overflow as well, I came across the Array approach to concatenate strings: var a = []; a.push(arg1,arg,2....); console.log(a.join('')); I know that this approach is better than the simple console.log(arg1 + arg2 +.....); for reasons of skipping creating intermediate objects but how does it fair better against : arg1.concat(arg2,arg3.....);

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• Decide which caching startegy to use ?

  - by hib

  Hi all, I want to cache my loaded data so that I can reduce my application start time . I know several strategies to store application data i.e. core data, nsuserdefaults , archiving . Now my scenario is that suppose that I have array of maximum 10 objects each object having 5 fields . So I can not decide which strategy to store this array an later retrieving the same . Thanks .

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• What is the best file system to use for a second hard drive when dual booting between WinXP and Win7

  - by Corey

  I am dual booting for legacy reasons, and I have a 2nd internal drive that I would like to use from both XP and 7. Should I go with the standard NTFS? (will the secuirty features be an issue, with different SIDs from the different users) Should I go with FAT32? Should I try out the new exFAT? Also, I curently have two of my 3 drives as "dynamic disks" and 1 spaned volume created on them. (i did this from XP) Win7 can see them/it fine. Is this an ok thing to do?

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• What is the best file system to use for a second hard drive when dual booting between WinXP and Win7

  - by Corey

  What is the best file system to use for a second hard drive when dual booting between WinXP and Win7? I am dual booting for legacy reasons, and I have a 2nd internal drive that I would like to use from both XP and 7. Should I go with the standard NTFS? (will the secuirty features be an issue, with different SIDs from the different users) Should I go with FAT32? Should I try out the new exFAT? Also, I curently have two of my 3 drives as "dynamic disks" and 1 spaned volume created on them. (i did this from XP) Win7 can see them/it fine. Is this an ok thing to do?

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• Sorting a List based on an ArrayList within a custom Object

  - by Matt Weldon

  I am using a list to keep track of a number of custom Row objects as follows: Public Rows As List(Of Row)() Row has 2 properties, Key (a String) and Cells (an ArrayList). I need to be able to sort each Row within Rows based on a developer defined index of the Cells ArrayList. So for example based on the following Rows Row1.Cells = ("b", "12") Row2.Cells = ("a", "23") Rows.Sort(0) would result in Row2 being first in the Rows list. What would be the best way of going about implementing this? Thanks

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• What is the display list in Flash 10? Array? Linked list?

  - by Typeoneerror

  I'm working on a game that has many elements on stage, so I'm looking to optimize my loops. I know that Vector is faster than looping an array, but I'm also in some cases using: while (i < numChildren) getChildAt(i) ...to update sprites. My question is when I use getChildAt, is that accessing an Array or Vector or linked list or other? Should I instead store references to my objects in a Vector and loop through that instead?

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• Does SQL Server have any kind of magic undo feature?

  - by Andrew G. Johnson

  Long story short is I tried to quickly update a single row in SQL Server using the Management studio and just typed UPDATE table SET column='value' and forgot the WHERE other_column='other_value' portion. Went for lunch, came back and theres 15 unread emails waiting for me. Happened about an hour ago, waiting for the database guy to come back to see when the last backup was. There's no magic UNDO feature though is there?

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• Unique string values in range

  - by Dean Smith

  I have some spreadsheets where there are large number of cells that have essentially been used for free text. There is a finite set of values for this free text and most, if not all repeat. eg. A B C D 1 Monkey Gorilla Cat Dog 2 Dog Cat Gorilla Gorilla 3 Dog Dog Dog Cat There are probably 50 or so different cell values spread over multiple sheets and hundreds of rows and columns. I need to analyse this data and count occurancies, which is not a problem other than getting a list of unique values to start with and this has been driving me up the wall. What is the best way to produce this list. So from the above we would have Monkey Dog Cat Gorilla In order of preferred solutions, as this will need to be done monthly. Dynamic formula based VB Script Other ( Advanced filtering or other manual steps )

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• Using xml to feed a silverlight application

  - by Aidenn

  Hey! I am building a Silverlight application that should get it's elements from XML defined objects, but I am kinda stuck: how should I feed the Silverlight application with the data in the XML? What would be a good approach? Can this be done by transforming XML to XAML using XSLT? Any other suggestion?

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• How can I get a string[] of all different values of a list?

  - by iTayb

  I have a class that has an list<Book> in it, and those Book objects has many many properties. string Subject is one of those properties. I'd like to get an string[] type value that will include all different subjects from all over the list. Is there an elegant way to do it, or I'll have to scan the whole list and enter each subject to it, then remove duplicates?

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• More efficient way to remove an element from an array in Actionscript 3

  - by Joshua

  I have an array of objects. Each object has a property called name. I want to efficiently remove an object with a particular name from the array. Is this the BEST way? private function RemoveSpoke(Name:String):void { var Temp:Array=new Array; for each (var S:Object in Spokes) { if (S.Name!=Name) { Temp.push(S); } } Spokes=Temp; }

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• How to get the name of a placemark using google earth api?

  - by user1444402

  I'm trying to create a web page where an user could manage diferent placemark. The management is based on create, drag and drop and delete placemarks. At the moment, I've achieved to create multiple placemarks and drag&drop them but I'm not able to delete it because I cannot identify them individually. I'm using the google earth api examples1 but I cannot find this functionality. I want to get the name of the different placemarks, any idea?

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• Choosing a monitoring system for a dynamically scaling environment: Nagios v. Zabbix

  - by wickett

  When operating in the cloud and scaling boxes automatically, there are certain monitoring issues that one experiences. Sometimes we might be monitoring 10 boxes and sometimes 100. The machines will scale up and down based on a demand. Right now, I think the best solution to this is to choose a monitoring solution that will instantiation of targets via calls to an API. But, is this really the best? I like the idea of dynamic discovery, but that is also a problem in the cloud seeing that the targets are not all in the same subnet. What monitoring solutions allow for a scaling environment like this? Zabbix currently has a draft API but I have been unable to fund a similar API for Nagios. Is there a similar API for Nagios? Anyone have any alternate suggestions besides Nagios and Zabbix?

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• I am validating for RegEx errors -- how can I return which keyword, it failed on?

  - by Trip

  I'm passing new objects through this set of regex : (?i)exp\s|(?i)expire\s|(?i)print|(?i)mention|(?i)spring|(?i)summer|(?i)winter|(?i)jan(\s|\.)|(?i)january|(?i)february|(?i)feb(\.|\s)|(?i)march|mar(\.|\s)|(?i)april|(?i)june|(?i)july|(?i)august|(?i)aug(\s|\.)|(?i)september|(?i)sept(\.|\s)|(?i)november|(?i)nov(\.|\s)|(?i)december|(?i)dec(\.|\s)|(?i)holiday|(?i)christmas|(?i)holloween|(?i)easter|(?i)season|(?i)ends|(?i)end If it errors, for example on the word christmas , how can I dynamically pull the word it errors on, and display it as the cause of the error?

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• How can I add a function reference to an object literal

  - by rob

  I need to add binders to DOM elements after rendering is done. Therefore I want to pass a list with (ID, callback) tuples to the rendering function so it can bind it after the rendering is done. So i would like to create a list of such objects and pass it to the rendering function: {id:'#someDOMelement', callback: someObject.someFunction} and bind it after the rendering like this: $(binders[i].id).bind('click', binders[i].callback);

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• In .NET, will cleaning a nested dictionaries parent release all memory upon garbage collection?

  - by Tomer Pintel

  I have the following nested dictionaries: Dictionary<int, Dictionary<string, object>> x; Dictionary<int, SortedDictionary<long, Dictionary<string, object>>> y; If I do x.Clear() and y.Clear() will all the nested objects clear and all the memory will be reused on the next garbage collection? Or do I need to iterate on all the items and clear them manually?

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• Dedicated podcast for PHP beginners

  - by justjoe

  I'm looking for any PHP/programming podcast episodes which specifically talk about PHP classes and objects. Maybe this is too specific but any reference is ok. BTW, are there any dedicated podcasts for PHP beginners?

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• Is there a common practice how to make freeing memory for Garbage Collector easier in .NET?

  - by MartyIX

  I've been thinking if there's a way how to speed up freeing memory in .NET. I'm creating a game in .NET (only managed code) where no significant graphics is needed but still I would like to write it properly in order to not to lose performance for nothing. For example is it useful to assign null value to objects that are not longer needed? I see this in a few samples over Internet. Thanks for answers!

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• What is the best way to manage unix process from java?

  - by erotsppa

  I'm looking for some simple tasks like listing all the running process of a user, or kill a particular process by pid etc. Basic unix process management from Java. Is there a library out there that is relatively mature and documented? I could run a external command from the JVM and then parse the standard output/error but that seems like a lot of work and not robust at all. Any suggestions?

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• SQLInForm.com like plug-in for SQL Server 2008

  - by Vishal Seth

  Is there a plug-in like the java applet @ SQLinForm.com for MS SQL Server Management Studio 2008? I tried SSMS tools based on someone's answer to my previous question but I don't find any functionality to format (beautify/tabify) SQL. If somebody could please point out that in SSMS tools or suggest some other tool (preferably free) Thanks :)

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• Returning records from 3 tables via a Join Table with Propel in Symfony

  - by Jon Winstanley

  I have 3 database tables: article article_has_tag (2 FK's to the other tables) tag I currently show a list of articles with the article's tags shown underneath but the number of queries grows as the list gets longer. I want to loop over all the articles and get the tag objects from each one in turn. Can it be done in 1 propel query?

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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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• Convert an ArrayList to an object array

  - by marionmaiden

  Hello, Is there a command in java for conversion of an ArrayList into a object array. I know how to do this copying each object from the arrayList into the object array, but I was wondering if would it be done automatically. I want something like this: ArrayList<TypeA> a; // Let's imagine "a" was filled with TypeA objects TypeA[] array = MagicalCommand(a);

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