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• What does "warning: unable to unlink website: Operation not permitted" mean when checking out a Git

  - by James A. Rosen

  I'm trying to create a local branch that tracks a remote branch. Here's what I get: > git checkout master > git push origin origin:refs/heads/myBranch Total 0 (delta 0), reused 0 (delta 0) To [email protected]:myrepo/myproject.git * [new branch] origin/HEAD -> myBranch > git fetch origin > git checkout --track -b myBranch origin/myBranch warning: unable to unlink website: Operation not permitted Branch myBranch set up to track remote branch myBranch from origin. Switched to a new branch 'myBranch' What does "warning: unable to unlink website: Operation not permitted" mean? Did everything work fine?

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• How to get predecessor and successors from an adjacency matrix

  - by NickTFried

  Hi I am am trying to complete an assignment, where it is ok to consult the online community. I have to create a graph class that ultimately can do Breadth First Search and Depth First Search. I have been able to implement those algorithms successfully however another requirement is to be able to get the successors and predecessors and detect if two vertices are either predecessors or successors for each other. I'm having trouble thinking of a way to do this. I will post my code below, if anyone has any suggestions it would be greatly appreciated. import java.util.ArrayList; import java.util.Iterator; import java.util.LinkedList; import java.util.Queue; import java.util.Stack; public class Graph<T> { public Vertex<T> root; public ArrayList<Vertex<T>> vertices=new ArrayList<Vertex<T>>(); public int[][] adjMatrix; int size; private ArrayList<Vertex<T>> dfsArrList; private ArrayList<Vertex<T>> bfsArrList; public void setRootVertex(Vertex<T> n) { this.root=n; } public Vertex<T> getRootVertex() { return this.root; } public void addVertex(Vertex<T> n) { vertices.add(n); } public void removeVertex(int loc){ vertices.remove(loc); } public void addEdge(Vertex<T> start,Vertex<T> end) { if(adjMatrix==null) { size=vertices.size(); adjMatrix=new int[size][size]; } int startIndex=vertices.indexOf(start); int endIndex=vertices.indexOf(end); adjMatrix[startIndex][endIndex]=1; adjMatrix[endIndex][startIndex]=1; } public void removeEdge(Vertex<T> v1, Vertex<T> v2){ int startIndex=vertices.indexOf(v1); int endIndex=vertices.indexOf(v2); adjMatrix[startIndex][endIndex]=1; adjMatrix[endIndex][startIndex]=1; } public int countVertices(){ int ver = vertices.size(); return ver; } /* public boolean isPredecessor( Vertex<T> a, Vertex<T> b){ for() return true; }*/ /* public boolean isSuccessor( Vertex<T> a, Vertex<T> b){ for() return true; }*/ public void getSuccessors(Vertex<T> v1){ } public void getPredessors(Vertex<T> v1){ } private Vertex<T> getUnvisitedChildNode(Vertex<T> n) { int index=vertices.indexOf(n); int j=0; while(j<size) { if(adjMatrix[index][j]==1 && vertices.get(j).visited==false) { return vertices.get(j); } j++; } return null; } public Iterator<Vertex<T>> bfs() { Queue<Vertex<T>> q=new LinkedList<Vertex<T>>(); q.add(this.root); printVertex(this.root); root.visited=true; while(!q.isEmpty()) { Vertex<T> n=q.remove(); Vertex<T> child=null; while((child=getUnvisitedChildNode(n))!=null) { child.visited=true; bfsArrList.add(child); q.add(child); } } clearVertices(); return bfsArrList.iterator(); } public Iterator<Vertex<T>> dfs() { Stack<Vertex<T>> s=new Stack<Vertex<T>>(); s.push(this.root); root.visited=true; printVertex(root); while(!s.isEmpty()) { Vertex<T> n=s.peek(); Vertex<T> child=getUnvisitedChildNode(n); if(child!=null) { child.visited=true; dfsArrList.add(child); s.push(child); } else { s.pop(); } } clearVertices(); return dfsArrList.iterator(); } private void clearVertices() { int i=0; while(i<size) { Vertex<T> n=vertices.get(i); n.visited=false; i++; } } private void printVertex(Vertex<T> n) { System.out.print(n.label+" "); } }

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• Deliver large volume of automatic notification emails without being throttled

  - by jack

  I think most website has certain needs to deliver emails to its users, e.g. account activation emails, private messsage notification, comment notification, etc. Take my site as example, among 5,000 registered users, about 1,500 signed up using gmail.com box, 1,000 using yahoo.com and another 1,000 using hotmail.com. Every now and then I receive complaints from users that they never receive account activation email, sometime it goes to junk folder sometimes it just not show in any folder. Maybe it's kind of being "throttled" when exceeded maximum number of messages sent from same ip address to gmail.com/yahoo.com/hotmail.com during certain period of time? I'm using Postfix and there seems no problem with configuration since 90% of emails can be delivered to gmail.com/yahoo.com/hotmail.com boxes successfully. I noticed twitter is delivering millions of such automatic notifications to its users but I never missed a message from them. How do they archive this? Is there a permanent white list on gmail.com, yahoo.com or hotmail.com? Thanks in advance.

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• No method found compiler warning

  - by Magic Bullet Dave

  I have create a class from a string, check it is valid and then check if it responds to a particular method. If it does then I call the method. It all works fine, except I get an annoying compiler warning: "warning: no '-setCurrentID:' method found". Am I doing something wrong here? Is there anyway to tell the compiler all is ok and stop it reporting a warning? The here is the code: // Create an instance of the class id viewController = [[NSClassFromString(class) alloc] init]; // Check the class supports the methods to set the row and section if ([viewController respondsToSelector:@selector(setCurrentID:)]) { [viewController setCurrentID:itemID]; } // Push the view controller onto the tab bar stack [self.navigationController pushViewController:viewController animated:YES]; [viewController release]; Cheers Dave

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• Dispelling the UIImage imageNamed: FUD

  - by Roger Nolan

  I see a lot of people saying imageNamed is bad but equal numbers of people saying the performance is good - especially when rendering UITableViews. See this SO question for example or this article on iPhoneDeveloperTips.com UIImage's imageNamed method used to leak so it was best avoided but has been fixed in recent releases. I'd like to understand the caching algorithm better in order to make a reasoned decision about where I can trust the system to cache my images and where I need to go the extra mile and do it myself. My current basic understanding is that it's a simple NSMutableDictionary of UIImages referenced by filename. It gets bigger and when memory runs out it gets a lot smaller. For example, does anyone know for sure that the image cache behind imageNamed does not respond to didReceiveMemoryWarning? It seems unlikely that Apple would not do this. If you have any insight into the caching algorithm, please post it here.

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• Does the Fetch Request do the recommended batch faulting?

  - by dontWatchMyProfile

  I'm curious. Apple says in the docs: Core Data automatically fires faults when necessary (when a persistent property of a fault is accessed). However, firing faults individually can be inefficient, and there are better strategies for getting data from the persistent store (see “Batch Faulting and Pre-fetching with the SQLite Store”). NSFetchRequest has this feature: [fetchRequest setFetchBatchSize:20]; Is this essentially performing such a batch faulting like recommended? Just to make this clear for others, faulting does not mean "turning into a fault" but it means "materializing it", just like "making a Scooby-Doo out of it". Pretty ugly wording error, in my opinion, but it's at least consistent in the docs ;)

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• What does class_eval <<-"end_eval", __FILE__, __LINE__ mean in Ruby?

  - by viatropos

  I'm learning how to use class_eval in modules (I'm somewhat familiar with class_eval) and came across this helpful class in resource_controller. In there they have things like this: class_eval <<-"end_eval", __FILE__, __LINE__ def #{block_accessor}(*args, &block) unless args.empty? && block.nil? args.push block if block_given? @#{block_accessor} = [args].flatten end @#{block_accessor} end end_eval What does __FILE__ and __LINE__ do in that context? I know __FILE__ references the current file, but what does that whole thing do exactly? Don't really know how to search for that :).

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• Create iPhone app programmatically, in its entirety

  - by miorel

  I recently became interested in iPhone app development, so I've been looking at online tutorials, and also reading a book, trying out the examples as I go along. I'm getting better, but one of the things I still find quite annoying about the usual development model is that I really have no idea what the SDK is really doing behind the scenes to make the app "work" because Apple protects me from this. For example, when I make connections on interface builder, this presumably corresponds to code being generated somewhere... Where that code is and what it does and how it works are not obvious (to me). So I'm wondering, is it possible to create an iPhone app entirely programmatically? That is, have execution start in some main method, which will then programmatically create any views, register event listeners, etc. And if yes, what are some good resources for something like this?

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• How can I efficiently group a large list of URLs by their host name in Perl?

  - by jesper

  I have text file that contains over one million URLs. I have to process this file in order to assign URLs to groups, based on host address: { 'http://www.ex1.com' = ['http://www.ex1.com/...', 'http://www.ex1.com/...', ...], 'http://www.ex2.com' = ['http://www.ex2.com/...', 'http://www.ex2.com/...', ...] } My current basic solution takes about 600 MB of RAM to do this (size of file is about 300 MB). Could you provide some more efficient ways? My current solution simply reads line by line, extracts host address by regex and puts the url into a hash. EDIT Here is my implementation (I've cut off irrelevant things): while($line = <STDIN>) { chomp($line); $line =~ /(http:\/\/.+?)(\/|$)/i; $host = "$1"; push @{$urls{$host}}, $line; } store \%urls, 'out.hash';

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• Are there scenarios where the ViewModel needs to invoke methods on the View w.r.t. MVVM in WPF?

  - by Gishu

  As per the pattern, the ViewModel exposes Properties(with change notification) and Commands (to notify the VM of user actions) that the View binds to. The only communication that flows from the VM to the View is the property change notifications (so that the View can refresh itself with updated data). In MVP or PresentationModel form of the pattern (if I'm not mistaken), the View implements a plain vanilla interface (consisting of methods, properties and/or events). With MVVM, it feels methods on the IView have been outlawed (along with IView itself). One scenario I could think of was to set the focus to a certain control in the View. (When the user does ActionX, the focus should immediately be set to FieldY). In MVP, I'd write this as IView.ActivateField(NameConstant), which the presenter or PM would invoke. In MVVM, this seems to be a fringe case that needs a workaround / little bit of code-behind. The VM implements an ActiveField Property, which it sets to NameConstant. The view picks up the change notification event and in a code-behind event handler, activates the Name control. Is the above just an exception to the norm? Or are there other such scenarios, where the VM needs to invoke a method on the View ?

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• How to render a Partial from a Model in Rails 2.3.5

  - by empire29

  I have a Rails 2.3.5 application and Im trying to render several Partials from within a Model (i know, i know -- im not supposed to). The reason im doing this is im integrating a Comet server (APE) into my Rails app and need to push updates out based on the Model's events (ex. after_create). I have tried doing this: ActionView::Base.new(Rails::Configuration.new.view_path).render(:partial => "pages/show", :locals => {:page => self}) Which allows me to render simple partials that don't user helpers, however if I try to user a link_to in my partial, i receive an error stating: undefined method `url_for' for nil:NilClass I've made sure that the object being passed into the "project_path(project)" is not nil. I've also tried including: include ActionView::Helpers::UrlHelper include ActionController::UrlWriter in the Module that contains the method that makes the above "render" call. Does anyone know how to work around this? Thanks

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• How does a WCF server inform a WCF client about changes? (Better solution then simple polling, e.g.

  - by Ian Ringrose

  see also "WCF push to client through firewall" I need to have a WCF client that connect to a WCF server, then when some of the data changes on the server the clients need to update its display. As there is likely to be a firewall between the clients and the server. All communications must be over HTTP The server can not make an (physical) outgoing call to the client. As I am writing both the client and the server I do not need to limit the solution to only using soap etc. I am looking for built in surport for "long polling" / "Comet" etc Thanks for the most informative answer from Drew Marsh on how to implement long polling in WCF. However I thought the main “selling point” of WCF was that you could do this sort of thing just by configuring the channels to be used in the config file. E.g I want a channel that logically two way but physically incoming only.

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• search & replace on 3000 row, 25 column spreadsheet

  - by Deca

  I'm attempting to clean up data in this (old) spreadsheet and need to remove things like single and double quotes, HTML tags and so on. Trouble is, it's a 3000 row file with 25 columns and every spreadsheet app I've tried (NeoOffice, MS Excel, Apple Numbers) chokes on it. Hard. Any ideas on how else I can clean this thing up for import to MySQL? Clearly I could go through each record manually, row by row, but would like to avoid that if at all possible. Likewise, I could write a PHP script to handle it on import, but don't want to put the server into a death spiral either.

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• Core Data vs SQLite 3

  - by Jason Medeiros

  I am already quite familiar with relational databases and have used SQLite (and other databases) in the past. However, Core Data has a certain allure, so I am considering spending some time to learn it for use in my next application. Is there much benefit to using Core Data over SQLite, or vice versa? What are the pros/cons of each? I find it hard to justify the cost of learning Core Data when Apple doesn't use it for many of its flagship applications like Mail.app or iPhoto.app - instead opting for SQLite databases. SQLite is also used extensively on the iPhone. Can those familiar with using both comment on their experience? Perhaps, as with most things, the question is deeper than just using one over the other?

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• Prototype Library use of !! operator

  - by Rajat

  Here is a snippet from Prototype Javascript Library : Browser: (function(){ var ua = navigator.userAgent; var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]'; return { IE: !!window.attachEvent && !isOpera, Opera: isOpera, WebKit: ua.indexOf('AppleWebKit/') > -1, Gecko: ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1, MobileSafari: /Apple.*Mobile/.test(ua) } })(), This is all good and i understand the objective of creating a browser object. One thing that caught my eye and I haven't been able to figure out is the use of double not operator !! in the IE property. If you read through the code you will find it at many other places. I dont understand whats the difference between !!window.attachEvent and using just window.attachEvent. Is it just a convention or is there more to it that's not obvious?

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• Does Objective-C have a Standard Library?

  - by Roman A. Taycher

  Most somewhat modern programming languages have a standard library? It is my impression is that there isn't a decent sized standard library for Obj-C , rather that it relies mostly/all on Cocoa and that (plus people not wanting to use GNUstep) is why Obj-C is only used on macs)? Is this true/to what extent? Are there any standard obj-c collections? (note I haven't done any Obj-C programming and am not to likely to try it in the near future, I'm just curious). P.S. are there a any decent non-Cocoa/Gnustep Libraries? are they non-apple, are they open source, well documented?

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• How to load different XIBs for different device orientations for same viewcontroller?

  - by Jaanus

  The documentation says that if I want to support both portrait and landscape, I basically have two ways of doing that: Set up the viewcontroller's view so that the subviews autoresize correctly and make smaller changes programmatically at runtime If the changes are more substantial, create an alternative landscape interface and push/pop the alternative modal viewcontroller at runtime I would like to present the info where the layout is substantially different, but logic is the same. Ideally, I would load another XIB for the same viewcontroller, but it does not seem to be an option. Sounds like #2 is what I need to do, but my problem with that is that it sounds like it would use the standard modalviewcontroller animations that are nothing like the device rotation animation. (Of course, being the lazywebber that I am, I did not test this hypothesis.) So, how do I load an alternative layout for landscape with the same viewcontroller but different XIB? Should I use the method #2 above and is the rotation animation natural? Or is there some other way?

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• Modify shell script to monitor/ping multiple ip addresses

  - by Alex

  Alright so I need to constantly monitor multiple routers and computers, to make sure they remain online. I have found a great script here that will notify me via growl(so i can get instant notifications on my phone) if a single ip cannot be pinged. I have been attempting to modify the script to ping multiple addresses, with little luck. I'm having trouble trying to figure out how to ping a down server while the script keeps watching the online servers. any help would be greatly appreciated. I haven't done much shell scripting so this is quite new to me. Thanks #!/bin/sh #Growl my Router alive! #2010 by zionthelion73 [at] gmail . com #use it for free #redistribute or modify but keep these comments #not for commercial purposes iconpath="/path/to/router/icon/file/internet.png" # path must be absolute or in "./path" form but relative to growlnotify position # document icon is used, not document content # Put the IP address of your router here localip=192.168.1.1 clear echo 'Router avaiability notification with Growl' #variable avaiable=false com="################" #comment prefix for logging porpouse while true; do if $avaiable then echo "$com 1) $localip avaiable $com" echo "1" while ping -c 1 -t 2 $localip do sleep 5 done growlnotify -s -I $iconpath -m "$localip is offline" avaiable=false else echo "$com 2) $localip not avaiable $com" #try to ping the router untill it come back and notify it while !(ping -c 1 -t 2 $localip) do echo "$com trying.... $com" sleep 5 done echo "$com found $localip $com" growlnotify -s -I $iconpath -m "$localip is online" avaiable=true fi sleep 5 done

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• Mac OS X bluetooth programming sample ?

  - by tuttu47

  Hi, I am trying to develop an application using bluetooth in my MAC mini. However, after searching all over net, all that I could find was the "Bluetooth Device Access Guide" from apple, and not a single sample program ! Is any sample code for this available ? I will also explain what I am trying to do in my program, so that if any of you can help me.... I want pair my iPhone with my MAC programmatically over the PAN profile, and then send data (streams) both-ways. I paired them manually, and I was successfully able to transfer data. I just want to do that programmatically ! Any help would be appreciated ...

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• Email as a view.

  - by Hal

  I've been in some discussion recently about where email (notifications, etc...) should be sent in an ASP.NET MVC application. My nemesis grin argues that it only makes sense that the email should be sent from the controller. I argue that an email is simply an alternate or augmented view through a different channel. Much like I would download a file as the payload of an ActionResult, the email is simply delivered through a different protocol. I've worked an extension method that allows me to do the following: <% Html.RenderEmail(model.FromAddress, model.ToAddress, model.Subject); %> which I actually include within my the view that is displayed on the screen. The beauty is that, based on convention, if I call RenderEmail from a parent view named MyView.ascx, I attempt to render the contents of a view named MyViewEmail.ascx, unless it is not found, in which case I simply email a copy of parent view. It certainly does make it testable (I still have an ISMTPService injected for testing), I wondered if anyone had any thoughts on whether or not this breaks from good practice. In use it has been extremely handy when we needed to easily send an email or modify the contents of the emailed results vs the browser rendered results. Thanks, Hal

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• [iPhone] presentModalViewController not working

  - by ryyst

  Hi, here's my code: ViewController *vc = [[ViewController alloc] initWithNibName:@"TableView" bundle:nil]; [self.navigationController presentModalViewController:vc animated:YES]; //[self setView:[vc view]]; If I call it, nothing happens. However, if I change it to: ViewController *vc = [[ViewController alloc] initWithNibName:@"TableView" bundle:nil]; //[self.navigationController presentModalViewController:vc animated:YES]; [self setView:[vc view]]; The view appears just fine (without the transition, of course). What am I doing wrong? Is there anything special you have to take care of when initializing the view controller? I tried to copy as much as possible from Apple's examples, but I can't get this to work... Thanks for any input! -- Ry

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• DNSSD Crash error tells me to use native Avahi API instead of Bonjour layer. How do I do this?

  - by Poul

  I get this error trying to run the example script here: http://github.com/tenderlove/dnssd/blob/master/sample/register.rb It says I am using a Bonjour Compatibility Layer and I should use the native api. How do I switch the dnssd ruby gem over to using this? *** WARNING *** The program 'ruby1.8' called 'DNSServiceAddRecord()' which is not supported (or only supported partially) in the Apple Bonjour compatibility layer of Avahi. *** WARNING *** Please fix your application to use the native API of Avahi! *** WARNING *** For more information see <http://0pointer.de/avahi-compat?s=libdns_sd&e=ruby1.8&f=DNSServiceAddRecord>

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• uninitialized constant Test::Unit::TestResult::TestResultFailureSupport

  - by Vitaly Kushner

  I get the error in subj when I'm trying to run specs or generators in a fresh rails project. This happens when I add shoulda to the mix. I added the following in the config/environment.rb: config.gem 'rspec', :version => '1.2.6', :lib => false config.gem 'rspec-rails', :version => '1.2.6', :lib => false config.gem "thoughtbot-shoulda", :version => "2.10.2", :lib => 'shoulda', :source => "http://gems.github.com" I'm on OSX. ruby 1.8.6 (2008-08-11 patchlevel 287) gems 1.3.5 rails 2.3.4 rspec - 1.2.6 shoulda - 2.10.2 test-unit - 2.0.3 I'm aware of this and adding config.gem 'test-unit', :lib => 'test/unit' indeed solves the genrator problem as it doesn't throw an exception, but it prints 0 tests, 0 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications at the end of the run so I suppose it tries to run tests which is unexpected and undesired, also the specs stop to run at all, seems like rspec is not running at all, when running rake spec I get the test-unit output again (with 0 tests as there are only specs, no tests defined)

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• Safari Extension - How to respond to Settings changes?

  - by Martin Marlow

  Hi, I'm currently working on an Extension for Safari 5 and I want to run a listener function whenever Settings changes are made. Apple provides an example for that, but it doesn't work for me. I currently have this listener function in my global html file: function numberChanged() { if(event.key == "number") alert("Number has changed!"); } safari.self.addEventListener("change", numberChanged, false); I hope somebody can help me. Does somebody know what I'm doing wrong?

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• How do i use repoze.who?

  - by misterwebz

  I'm having some trouble understanding how repoze.who works. I've followed a tutorial i found by searching on google and here's what i already have: This is what i added in my middleware.py file from repoze.who.config import make_middleware_with_config as make_who_with_config app = make_who_with_config(app, global_conf, app_conf['who.config_file'], app_conf['who.log_file'], app_conf['who.log_level']) Here's the who.ini : http://pastebin.com/w5Tba2Fp Here's repoze_auth.py in /lib/auth/: from paste.httpexceptions import HTTPFound from iwant.model import User class UserModelPlugin(object): def authenticate(self, environ, identity): try: username = identity['login'] password = identity['password'] except KeyError: return None success = User.authenticate(username, password) return success def add_metadata(self, environ, identity): username = identity.get('repoze.who.userid') user = User.get(username) if user is not None: identity['user'] = user I've also checked the plugins in the repoze.who folder, but i failed to understand how it's supposed to be used. I'd appreciate it if someone would push me in the right direction.

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