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• Defend zero-based arrays

  - by DrJokepu

  A question asked here recently reminded me of a debate I had not long ago with a fellow programmer. Basically he argued that zero-based arrays should be replaced by one-based arrays since arrays being zero based is an implementation detail that originates from the way arrays and pointers and computer hardware work, but these sort of stuff should not be reflected in higher level languages. Now I am not really good at debating so I couldn't really offer any good reasons to stick with zero-based arrays other than they sort of feel like more appropriate. I am really interested in the opinions of other developers, so I sort of challenge you to come up with reasons to stick with zero-based arrays!

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• Disposing of Objects with long living dependencies

  - by Ray Booysen

  public class ABC { public ABC(IEventableInstance dependency) { dependency.ANewEvent += MyEventHandler; } private void MyEventHandler(object sender, EventArgs e) { //Do Stuff } } Let us say that an instance of ABC is a long living object and that my dependency is an even longer running object. When an instance of ABC needs to be cleaned up, I have two options. One I could have a Cleanup() method to unsubscribe from the ANewEvent event or I could implement IDisposable and in the Dispose unwire the event. Now I have no control over whether the consumer will call the dispose method or even the Cleanup method should I go that route. Should I implement a Finaliser and unsubscribe then? It feels dirty but I do not want hanging instances of ABC around. Thoughts?

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• What does the symbol :=: mean

  - by Dan Maguire

  I've found the symbol :=: in some Clarion code and I can't seem to figure out exactly what it does. The code was written by a previous developer many years ago, so I can't ask him. I also have not been able to find any results for "colon equals colon" in Google. Here is an example of the code, where bufSlcdpaDtl is a file object: lCCRecord Like(bufSlcdpaDtl),Pre(lCCRecord) ! ...other stuff... lCCRecord :=: bufSlcdpaDtl I'm wondering if it's something similar to ::= in Python or possibly the assignment operator :=.

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• Automatically render changed partials in webby

  - by Tomas Sedovic

  I have a webby page and I'm have a layout that all my pages are rendered to. That layout uses a partial for navigation (in HAML): = render(:partial => "navigation", :locals => {:some => "stuff"} ) The problem is that when I change the _navigation partial, neither webby nor webby autobuild recognize the change and they don't re-render the pages. I've solved this by setting the dirty: true flag in the layout, but that makes all the pages re-render every time -- even when nothing changed. I know that this is not that big a deal, but still: is there a way so that when you change partial, webby recognizes this and renders only the affected pages (as it does with everything else)?

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• wpf do animation until background worker finishes its work

  - by toni

  Hi! I have an application that do some hard stuff when user clicks a start button and takes a long time. During this I would like to do some animation over a label, for example, changing opacity from 0 to 1 and vice versa and change foreground color between several colors at the same time changing opacity. I want it stops doing animation when background worker finishes its work. How can I do this? and how can I start animation and stop it from c#? Thanks very much!

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• What's an elegant way to conditionally add a class to an HTML element in a view?

  - by ryeguy

  I occasionally have to add a class to an html element based on a condition. The problem is I can't figure out a clean way of doing it. Here's an example of the stuff I've tried: <div <%= if @status = 'success'; "class='ok'"; end %>> some message here </div> OR <% if @status == 'success' %> <div class='success'> <% else %> <div> <% end %> some message here </div> I don't like the first approach because it's crowded looking and hard to read. I don't like the second approach because the nesting is screwed up. It'd be nice to put it in the model, (something like @status.css_class), but that doesn't belong there. What do most people do?

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• Xcode 4.2 how include one project into another one?

  - by Alex Stone

  I keep searching, but cannot find a clear and simple explanation on how to include one XCode project, along with all of it's sub-classes into another project. I routinely see stuff like that in sample projects that I download off the web, but do not know how to do this myself. Within XCode, along with .h and .m files, and folders, there's a whole new project, starting with a blue xcode project icon, that is expandable to contain everything within the project. Please, can someone explain to me step by step what do I need to do to add one XCode project into another one? I've seen a ton of one liners like "header search paths", but that does not tell me much. UPDATE: After re-reading the documentation, I realized that the project to include must be dragged ONTO the BLUE project icon of the parent project. Regular sources can be dragged anywhere, but a project must be dragged onto a project. Thank you!

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• Free hosting service for private and public git repositories

  - by Alexander

  Hi, does anyone know a free service for hosting private and public git repositories? There are a lot of services like for example the well known github. Most of them only allow hosting of public repositories. I want to host one or more of my private programming projects using git, but not all of them should be public (at least not for now). I also found the free service GitFarm which is build using the Google App Engine technology, but i couldn't find any information how it works (don't know what "built on Google App Engine technology" means) or if there are any other limitations. Also it seams like there is no web front-end available. An integrated web front-end, bug tracker and stuff like this would also be a big plus!

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• How to stop a WPF binding from ignoring the PropertyChanged event that it caused?

  - by Jacob Stanley

  I have a TextBox bound to a ViewModel's Text property with the following setup: Xaml <TextBox Text="{Binding Text}"/> C# public class ViewModel : INotifyPropertyChanged { public string Text { get { return m_Text; } set { if (String.Equals(m_Text, value)) { return; } m_Text = value.ToLower(); RaisePropertyChanged("Text"); } } // Snip } When I type some stuff in to the TextBox it successfully sets the Text property on the ViewModel. The problem is that WPF ignores the property changed event that is raised by it's own update. This results in the user not seeing the text they typed converted to lowercase. How can I change this behaviour so that the TextBox updates with lowercase text? Note: this is just an example I have used to illustrate the problem of WPF ignoring events. I'm not really interested in converting strings to lowercase or any issues with String.Equals(string, string).

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• WP plugin based on useragent

  - by jake

  I am writing a plugin which does some js stuff, but does not work for other browsers than FF . I've thought why not execute the plugin for the browsers which support it. I've added the code, but for some reason when I activate the plugin and check the site with a FF all I get is blank page. If I visit with a IE the site is shown correctly. Basically my code is like this $agent= strtolower($_SERVER['HTTP_USER_AGENT']); if (preg_match('/firefox/',$agent)){ include(plugins_url('script.js',FILE)); some more code } So when I visit with FF I get blank page, when I visit with IE the blog loads normally

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• VS2010 profiler/leak detection

  - by Noah Roberts

  Anyone know of a profiler and leak detector that will work with VS2010 code? Preferably one that runs on Win7. I've searched here and in google. I've found one leak detector that works (Memory Validator) but I'm not too impressed. For one thing it shows a bunch of menu leaks and stuff which I'm fairly confident are not real. I also tried GlowCode but it's JUST a profiler and refuses to install on win7. I used to use AQtime. It had everything I needed, memory/resource leak detection, profiling various things, static analysis, etc. Unfortunately it gives bogus results now. My main immediate issue is that VS2010 is saying there are leaks in a program that had none in VS2005. I'm almost certain it's false positives but I can't seem to find a good tool to verify this. Memory Validator doesn't show the same ones and the reporting of leaks from VS doesn't seem rational.

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• WPF: Is it possible to nest TreeView items with a binding expression?

  - by John Gietzen

  Lets say I have the following data: <XmlDataProvider x:Key="Values"> <x:XData> <folder name="C:"> <folder name="stuff" /> <folder name="things" /> <folder name="windows"> <folder name="system32" /> </folder> </folder> </x:XData> </XmlDataProvider> How can I get that into a treeview? I can't seem to grok hierarchical binding... I know that I can get it in there in C# code, but I wanted to do it with a binding expression.

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• Greasemonkey: load url using GM_xmlhttpRequest and createContextualFragment

  - by Dave

  I have the following GreaseMonkey Script: GM_xmlhttpRequest({ method: 'GET', url: "http://www.testurl.com", headers: { 'User-agent': 'Mozilla/4.0 (compatible) Greasemonkey/0.3', }, onload: function(responseDetails) { var tagString = responseDetails.responseText; var range = document.createRange(); range.selectNode(document.body); var documentFragment = range.createContextualFragment(tagString); How do I now extract stuff from documentFragment? documentFragment.getElementById(''), document.body etc all returns undefined. I suspect this is due to the createContextualFragment method returning a XPCNativeWrapper object, but how do I work around this to access the underlying DOM? Thanks

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• WPF TextBox Custom Dictionary Support

  - by Tom Allen

  Has anyone found a workaround yet for getting custom dictionary support working for the built in spellchecking on WPF TextBoxes/RichTextBoxes? We've been probing the spelling stuff with reflector hoping to find where the dictionary entries are coming from, but it's looking very much like it's going to be a COM object.... I know it's not currently supported and that Microsoft were looking into supporting it in a future release, but that was quite a while ago and I can't seem to find any recent news about it. Clutching at staws, I've posted a suggestion up on Connect: https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=470233

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• CSRF error when trying to log onto Django admin page with w3m on Emacs23

  - by Vernon

  I normally use Firefox and have had no problems with the admin page on my Django website. But I use Emacs23 for writing my posts, and wanted to be able to use w3m in Emacs to copy the stuff across. When I try to log into my admin pages, it gives the CSRF error: CSRF verification failed. Request aborted. Help Reason given for failure: No CSRF or session cookie. ... Is there a way that I could get w3m to work with my admin page? I am not sure if the problem lies with the way the admin is set up on Django or with the Emacs or w3m settings.

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• Visual Studio - 'Browse UDDI Servers' -> 404 ?

  - by southof40

  Hi - I have a ASP.Net application which implements a web service. Within the ASP.Net application there's a test script which consumes the web service and it all works etc. I have built a .NET console application and want to 'Add a Web Reference' so that the console app can consume the web service provided by the ASP.NET application. When I use the 'Browse UDDI Servers on the local network' to do that any plausible URL I use results in a 404. I'm guessing I need to do something to my ASP.Net application so that it acts as an UDDI server ? Does anyone know what ? Update I just wanted to clarify something - I'm not desperate to use UDDI it just seems that's the only option in my circumstances which are : I'm actually doing this for another developer who is used to using Visual Studio to do this stuff The other developers system will need to run on another machine within the same network.

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• How can I pause a BackgroundWorker? Or something similar...

  - by juan

  I was using a BackgroundWorker to download some web sites by calling WebClient.DownloadString inside a loop. I wanted the option for the user to cancel in the middle of downloading stuff, so I called CancelAsync whenever I found that CancellationPending was on in the middle of the loop. But now I noticed that the function DownloadString kinda freezes sometimes, so I decided to use DownloadStringAsync instead (all this inside the other thread created with BackgroundWorker). An since and don't want to rewrite my whole code by having to exit the loop and the function after calling DownloadStringAsync, I made a while loop right after calling it that does nothing but checks for a variable bool Stop that I turn true either when the DownloadStringCompleted event handler is called or when the user request to cancel the operation. Now, the weird thing is that it works fine on the debug version, but on the release one, the program freezes in the while loop like if it were the main thread.

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• Using comet with PHP?

  - by ryeguy

  I was thinking of implementing real time chat using a PHP backend, but I ran across this comment on a site discussing comet: My understanding is that PHP is a terrible language for Comet, because Comet requires you to keep a persistent connection open to each browser client. Using mod_php this means tying up an Apache child full-time for each client which doesn’t scale at all. The people I know doing Comet stuff are mostly using Twisted Python which is designed to handle hundreds or thousands of simultaneous connections. Is this true? Or is it something that can be configured around?

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• How to calculate order (big O) for more complex algorithms (ie quicksort)

  - by bangoker

  I know there are quite a bunch of questions about big O notation, I have already checked Plain english explanation of Big O , Big O, how do you calculate/approximate it?, and Big O Notation Homework--Code Fragment Algorithm Analysis?, to name a few. I know by "intuition" how to calculate it for n, n^2, n! and so, however I am completely lost on how to calculate it for algorithms that are log n , n log n, n log log n and so. What I mean is, I know that Quick Sort is n log n (on average).. but, why? Same thing for merge/comb, etc. Could anybody explain me in a not to math-y way how do you calculate this? The main reason is that Im about to have a big interview and I'm pretty sure they'll ask for this kind of stuff. I have researched for a few days now, and everybody seem to have either an explanation of why bubble sort is n^2 or the (for me) unreadable explanation a la wikipedia Thanks!

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• Objective-C Memory Management: When do I [release]?

  - by Sahat

  I am still new to this Memory Management stuff (Garbage Collector took care of everything in Java), but as far as I understand if you allocate memory for an object then you have to release that memory back to the computer as soon as you are finished with your object. myObject = [Object alloc]; and [myObject release]; Right now I just have 3 parts in my Objective-C .m file: @Interface, @Implementation and main. I released my object at the end of the program next to these guys: [pool drain]; return 0; But what if this program were to be a lot more complicated, would it be okay to release myObject at the end of the program? I guess a better question would be when do I release an object's allocated memory? How do I know where to place [myObject release];?

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• Crash in Reachability API

  - by Marc

  I'm using the Reachability sample code provided by Apple to check the network connectivity and get notified of changes (Reachability Sample code). I had a look at some crash locks of my app. It seems that some crashes are due to the Reachability/SystemConfiguration Reachablity API stuff (see below). SCNetworkReachabilityGetFlags is only used in the Reachability class provided by Apple. Or am I misinterpreting the crash log? Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x00000000, 0x00000000 Crashed Thread: 0 Thread 0 Crashed: 0 libSystem.B.dylib 0x00000e70 mach_msg_trap + 20 1 libSystem.B.dylib 0x00003354 mach_msg + 60 2 SystemConfiguration 0x0001f480 configopen + 168 3 SystemConfiguration 0x00004d08 SCDynamicStoreCreateWithOptions + 272 4 SystemConfiguration 0x00004e54 SCDynamicStoreCreate + 24 5 SystemConfiguration 0x00015244 updateReachabilityStoreInfo + 152 6 SystemConfiguration 0x00016f04 updateCommCenterStatus + 32 7 SystemConfiguration 0x00017678 checkAddress + 1368 8 SystemConfiguration 0x0001a260 __SCNetworkReachabilityGetFlags + 1992 9 SystemConfiguration 0x0001b00c rlsPerform + 132 10 CoreFoundation 0x00058266 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 8 11 CoreFoundation 0x00028692 __CFRunLoopDoSources0 + 214 12 CoreFoundation 0x00027f62 __CFRunLoopRun + 258 13 CoreFoundation 0x00027d74 CFRunLoopRunSpecific + 220 14 CoreFoundation 0x00027c82 CFRunLoopRunInMode + 54 15 GraphicsServices 0x00004e84 GSEventRunModal + 188 16 UIKit 0x00004f8c -[UIApplication _run] + 564 17 UIKit 0x000024cc UIApplicationMain + 964 18 MyApp 0x0000f80c main (main.m:21) 19 MyApp 0x0000f77c start + 44

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• Managing Unique IDs in stateless (web) DB4O applications

  - by Phil.Wheeler

  I'm playing around with building a new web application using DB4O - piles of fun and some really interesting stuff learned. The one thing I'm struggling with is DB4O's current lack of support for stateless applications (i.e. web apps, mostly) and the need for automatically-generated IDs. There are a number of creative and interesting approaches that I've been able to find that hook into DB4O's events, use GUIDs rather than numeric IDs or for whatever reason avoid using any system of ID at all. While each approach has its merits, I'm wondering if the less-elegant approach might equally be the best fit. Consider the following pseudo-code: If ID == 0 or null Set ID = (typeof(myObject)).Count myObject.Save It seems like such a blindingly simple approach, it's usually about here that I start thinking, "I've missed something really obvious". Have I?

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• Creating a MSI patch (.msp) by hand?

  - by Jerry Chong

  Our team has recently been considering pushing out a minor registry fix to users to modify one particular problematic key. Pretty straightforward stuff, just needed to update 1 key/value inside the registry. So at the moment, we are using Wix to build .msi installers for the product. While looking into Wix's support for generating .msp patch files, it seems that the only way to create an .msp is a somewhat overcomplicated multi-step process to: Get a copy of the original MSI, and compile a new copy of the fixed MSI Write a new Wix file that points to both installers Compile the Wix file into a .wixobj with Candle to a .psp Run Torch/Pyro over before/after snapshots of the original installers and the .psp, or alternatively using MsiMsp.exe Now my question is, can't I simply describe the registry change into a Wix file and directly compile it into the .msp, without step 1 and 4 - which is a huge amount of effort for just a simple change?

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• Why can't sub-packages see package private classes?

  - by Polaris878

  Okay so, I have this project structure: package A.B class SuperClass (this class is marked package private) package A.B.C class SubClass (inherits from super class) I'd rather not make SuperClass publicly visible... It is really just a utility class for this specific project (A.B). It seems to me that SubClass should be able to see SuperClass, because package A.B.C is a subpackage of A.B... but this is not the case. What would be the best way to resolve this issue? I don't think it makes sense to move everything in A.B.C up to A.B or move A.B down to A.B.C... mainly because there will probably be an A.B.D which inherits from stuff in A.B as well... I'm a bit new to Java, so be nice :D (I'm a C++ and .NET guy)

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• I wanted to be a programmer

  - by Henrik P. Hessel

  Hello, let me ask your opinion. I'm 25 now, living in Germany. I started with QBASIC, did some Java in Highschool, and after School I created some Websites in PHP. Now, because my Company is Microsoft Gold Partner, I've to use Microsoft all the time. C#, MSSQL, ASPX and Sharepoint <- I really hate it! So, in my spare I concentrate to gain more knowledge (C++, Java, Silverlight or WPF), because it feels that I'm so far behind, in comparison for example to you guys, or other older employees in my company. Do think that my behaviour is useful? Should I focus my time to become i.e. a pure C# Programmer? I did C# even before I started to learn some C++. Should I learn what do with pointers, memcpy and stuff like that, even if managed code brings us so much benefits? Or is it a waste of time, better invested in learning the latest technologies? rAyt

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