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• Is an object in objective-c EVER created without going through alloc?

  - by Jared P

  Hi, I know that there are functions in the objective-c runtime that allow you to create objects directly, such as class_createInstance. What I would like to know is if anything actually uses these functions other than the root classes' (NSObject) alloc method. I think things like KVC bindings might, but those aren't present on the iPhone OS (to my knowledge, correct me if I'm wrong), so is there anything that would do this? In case you're wondering/it matters, I'm looking to allocate the size of an instance in a way that circumvents the objc runtime by declaring no ivars on a class, but overriding the +alloc method and calling class_createInstance(self, numberofbytesofmyivars). Thanks

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• Subsonic SQLite Multiple Files

  - by Marcus Vinicius de LIma

  Hi, I have an application that must be accessed for many users. To optimize the performance I intend to store each user profile information at a independant database file. I need everytime a user login the application, to setup a new provider linked with his own database. All databases have the same structure. So while querying user the commom generated DAL classes must switch for the database file relative the the user. Is there a way for configure SubSonic for doing that switch at runtime? Thanks.

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• Integrating Pentaho/Talend/etc. with an OR Mapper

  - by DaDaDom

  We have an application (Java) with an own OR mapper. Within this system we have what can be compared to Hibernate's interceptors (we call it triggers): Do specific actions just before saving data in the database, after it's deleted and so on. The underlying database is MySQL. Now we would like to use tools such as Pentaho Data Integration or Talend to convert data to put it into our system. It's no problem to do that directly on the SQL level, but by doing so we loose the built-in power of our triggers. Is there a way to somehow integrate any of the Data Integration solutions into our existing application? It would be great if there was a way to write into instances of our classes instead of writing into the database directly. Any hints welcome :-)

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• Mixin or Trait implementation in AS3?

  - by Brian Heylin

  I'm looking for ideas on how to implement a Mixin/Trait style system in AS3. I want to be able to compose a number of classes together into a single object. Of course this is not a language level feature of AS3, but I'm hoping that there is maybe some way to do this using prototype based techniques or maybe some bytecode hacking that I believe AsMock uses to implement it's functionality. An existing Java example is Qi4J where the user define interfaces that the Qi4j framework implements based on metadata tags and coding by convention. Has anyone any ideas on how to get the Mixin/Trait concept working within AS3?

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• Limited IList<> implementation ?

  - by Wam

  Hello people, I'm doing some work with stats, and want to refactor the following method : public static blah(float[] array) { //Do something over array, sum it for example. } However, instead of using float[] I'd like to be using some kind of indexed enumerable (to use dynamic loading from disk for very large arrays for example). I had created a simple interface, and wanted to use it. public interface IArray<T> : IEnumerable<T> { T this[int j] { get; set; } int Length { get; } } My problem is : float[] only inherits IList, not IArray, and AFAIK there's no way to change that. I'd like to ditch IArray and only use IList, but my classes would need to implement many methods like Add, RemoveAt although they are fixed size And then my question : how can float[] implement IList whereas it doesn't have these methods ? Any help is welcome. Cheers

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• Core Location question....

  - by Moshe

  This tutorial on mobileorchard.com uses 2 classes (or 2 sets of .h and .m) to implement core location. Can I just use everything there in my existing class? How would I do that? Also, is the - (id) init { self = [super init]; if (self != nil) { self.locationManager = [[[CLLocationManager alloc] init] autorelease]; self.locationManager.delegate = self; // send loc updates to myself } return self; } method the same as the usual initWithNib? I;m trying to quickly implement something based on location information. As much help describing the above linked tutorial would be helpful. Thanks. No - really, Thank You.

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• Question about spring manning-in-action

  - by Gandalf StormCrow

  I saw people asking about best book for learning spring, and I came across manning.spring in action was recommended most of the time so I decided to give it a go. The thing is the author offers some pretty reasonable explanations, puzzle by puzzle it gets in your head, than you just need to code it and you're done, you get it(this is how I work don't know about the others). When it comes to the code its very disapointing, I went trought the Knight example like 2 or 3 times by now and I see its incorrect in the book, I mean its hard already for people eager to learn and why not a note somewhere in the book like pseudo-code or something. The knight example in the first chapter is missing two classes QuestFailedException and HolyGrail I mean other people must have noticed this, why is everyone recommending this book without saying at least it has some errors(like many others do), was anyone actually been able to compile and this first chapter example?

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• How to Retrieve Method's Signature in Squeak

  - by Artium

  printThisMethodSig: aSomething stack := thisContext stackOfSize: 2. Transcript show: (stack at: 2); cr. stack at: 2 returns the method context of the current method. It is possible to retrieve the compiled method of the current method using method message. I want to be able to print the whole signature of the method, for example: from:to:. I looked at both MethodContext and CompiledMethod classes but could not find out how to do it. Thank you.

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• How to Add a File from my source tree to Maven Site

  - by Charles O.

  I have a Maven 2 RESTful application using Jersey/JAXB. I generate the JAXB beans from a schema file, where the schema file is in my resources directory, e.g., src/main/resources/foo.xsd. I want to include foo.xsd file in the generated Maven site for my project, so that clients can see the XML schema when writing RESTful calls. How can I include foo.xsd in the site? I could have a copy of the file in src/main/site/..., and then update my site.xml to point to it (or have a .apt whose contents point to it), but I don't like that because I'm still tweaking foo.xsd, and don't want to have to remember to copy it each time I update it. And that's just bad practice. I also tried having a .apt file that has a link to the foo.xsd which gets copied to the target/classes directory. That works until I do a site:deploy, because that only copies the target/site directory. Thanks, Charles

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• Where and how to validate and map ViewModel?

  - by chobo

  Hi, I am trying to learn Domain Driven Design and recently read that lots of people advocate creating a ViewModels for your views that store all the values you want to display in a given view. My question is how should I do the form validation? should I create separate validation classes for each view, or group them together? I'm also confused on what this would look like in code. This is how I currently think validation and viewmodels fit in to the scheme of things: View (some user input) - Controller - FormValidation(of ViewModel) - (If valid map to ViewModel to Domain Model) - Domain Layer Service - Infrastructure Thanks! P.S. I use Asp.net MVC with C#

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• Override number of parameters of pure virtual functions

  - by Jir

  I have implemented the following interface: template <typename T> class Variable { public: Variable (T v) : m_value (v) {} virtual void Callback () = 0; private: T m_value; }; A proper derived class would be defined like this: class Derived : public Variable<int> { public: Derived (int v) : Variable<int> (v) {} void Callback () {} }; However, I would like to derive classes where Callback accepts different parameters (eg: void Callback (int a, int b)). Is there a way to do it?

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• Automatic CSS Preview Generator - Have css file, want to automatically generate html to preview styl

  - by Marcel Chastain

  I have a fairly large CSS file developed by my web designer. There are, of course, plenty of IDs, classes and tag properties assigned therein. Are there any tools to automatically generate HTML based on a CSS source file? For example: #basicInfoHead{ background:url(../images/leftHeaders.jpg) no-repeat; margin-left: 0px; width:185px; height:28px; } #basicInfoHead span{ float: left; } Would generate <div id=basicInfoHead><span>#basicInfoHead span</span></div> Etc etc. From there, I could preview the generated code in my browser, and see what each of the individual (primarily text) styles would look like. Thanks in advance!

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• iPhones SDK: Setting a relationship property object using core data?

  - by Harkonian

  I'm using core data in my app. I have two entities that are related: EntityA and EntityB. EntityA has a property of type "relationship" with EntityB. In addition, both of these entities are defined classes (not the default NSManagedObject). I'm inserting a new object into my data like this: EntityA *newEntityA = [NSEntityDescription insertNewObjectForEntityForName:@"EntityA" inManagedObjectContext:self.managedObjectContext]; newEntityA.name = @"some name"; newEntityA.entityB.name = @"some other name"; The problem is entityB.name is null. Even if I add an NSLog() statement right after assigning the value, it is null. What is the proper way of setting my "name" property of EntityB when EntityB is a property of EntityA?

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• System.InvalidOperationException in Output Window

  - by user318068

  I constantly get the following message in my output/debug windows. The app doesn't crash but I was wondering what the deal with it is: A first chance exception of type 'System.InvalidOperationException' occurred in System.dll my code :sol.cs using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Sol { public LinkedList<int> tower1 = new LinkedList<int>(); public LinkedList<int> tower2 = new LinkedList<int>(); public LinkedList<int> tower3 = new LinkedList<int>(); public static LinkedList<string> BFS = new LinkedList<string>(); public static LinkedList<string> DFS = new LinkedList<string>(); public static LinkedList<string> IDS = new LinkedList<string>(); public int depth; public LinkedList<Sol> neighbors; public Sol() { } public Sol(LinkedList<int> tower1, LinkedList<int> tower2, LinkedList<int> tower3) { this.tower1 = tower1; this.tower2 = tower2; this.tower3 = tower3; neighbors = new LinkedList<Sol>(); } public virtual void getneighbors() { Sol temp = this.copy(); Sol neighbor1 = this.copy(); Sol neighbor2 = this.copy(); Sol neighbor3 = this.copy(); Sol neighbor4 = this.copy(); Sol neighbor5 = this.copy(); Sol neighbor6 = this.copy(); if (temp.tower1.Count != 0) { if (neighbor1.tower2.Count != 0) { if (neighbor1.tower1.First.Value < neighbor1.tower2.First.Value) { neighbor1.tower2.AddFirst(neighbor1.tower1.First); neighbor1.tower1.RemoveFirst(); neighbors.AddLast(neighbor1); } } else { neighbor1.tower2.AddFirst(neighbor1.tower1.First); neighbor1.tower1.RemoveFirst(); neighbors.AddLast(neighbor1); } if (neighbor2.tower3.Count != 0) { if (neighbor2.tower1.First.Value < neighbor2.tower3.First.Value) { neighbor2.tower3.AddFirst(neighbor2.tower1.First); neighbor2.tower1.RemoveFirst(); neighbors.AddLast(neighbor2); } } else { neighbor2.tower3.AddFirst(neighbor2.tower1.First); neighbor2.tower1.RemoveFirst(); neighbors.AddLast(neighbor2); } } //------------- if (temp.tower2.Count != 0) { if (neighbor3.tower1.Count != 0) { if (neighbor3.tower2.First.Value < neighbor3.tower1.First.Value) { neighbor3.tower1.AddFirst(neighbor3.tower2.First); neighbor3.tower2.RemoveFirst(); neighbors.AddLast(neighbor3); } } else { neighbor3.tower1.AddFirst(neighbor3.tower2.First); neighbor3.tower2.RemoveFirst(); neighbors.AddLast(neighbor3); } if (neighbor4.tower3.Count != 0) { if (neighbor4.tower2.First.Value < neighbor4.tower3.First.Value) { neighbor4.tower3.AddFirst(neighbor4.tower2.First); neighbor4.tower2.RemoveFirst(); neighbors.AddLast(neighbor4); } } else { neighbor4.tower3.AddFirst(neighbor4.tower2.First); neighbor4.tower2.RemoveFirst(); neighbors.AddLast(neighbor4); } } //------------------------ if (temp.tower3.Count() != 0) { if (neighbor5.tower1.Count() != 0) { if (neighbor5.tower3.ElementAtOrDefault(0) < neighbor5.tower1.ElementAtOrDefault(0)) { neighbor5.tower1.AddFirst(neighbor5.tower3.First); neighbor5.tower3.RemoveFirst(); neighbors.AddLast(neighbor5); } } else { neighbor5.tower1.AddFirst(neighbor5.tower3.First); neighbor5.tower3.RemoveFirst(); neighbors.AddLast(neighbor5); } if (neighbor6.tower2.Count() != 0) { if (neighbor6.tower3.ElementAtOrDefault(0) < neighbor6.tower2.ElementAtOrDefault(0)) { neighbor6.tower2.AddFirst(neighbor6.tower3.First); neighbor6.tower3.RemoveFirst(); neighbors.AddLast(neighbor6); } } else { neighbor6.tower2.AddFirst(neighbor6.tower3.First); neighbor6.tower3.RemoveFirst(); neighbors.AddLast(neighbor6); } } } public override string ToString() { string str; str = "tower1" + tower1.ToString() + " tower2" + tower2.ToString() + " tower3" + tower3.ToString(); return str; } public Sol copy() { Sol So; LinkedList<int> l1 = new LinkedList<int>(); LinkedList<int> l2 = new LinkedList<int>(); LinkedList<int> l3 = new LinkedList<int>(); for (int i = 0; i <= this.tower1.Count() - 1; i++) { l1.AddLast(tower1.ElementAt(i)); } for (int i = 0; i <= this.tower2.Count - 1; i++) { l2.AddLast(tower2.ElementAt(i)); } for (int i = 0; i <= this.tower3.Count - 1; i++) { l3.AddLast(tower3.ElementAt(i)); } So = new Sol(l1, l2, l3); return So; } public bool Equals(Sol sol) { if (this.tower1.Equals(sol.tower1) & this.tower2.Equals(sol.tower2) & this.tower3.Equals(sol.tower3)) return true; return false; } public virtual bool containedin(Stack<Sol> vec) { bool found = false; for (int i = 0; i <= vec.Count - 1; i++) { if (vec.ElementAt(i).tower1.Equals(this.tower1) && vec.ElementAt(i).tower2.Equals(this.tower2) && vec.ElementAt(i).tower3.Equals(this.tower3)) { found = true; break; } } return found; } public virtual bool breadthFirst(Sol start, Sol goal) { Stack<Sol> nextStack = new Stack<Sol>(); Stack<Sol> traversed = new Stack<Sol>(); bool found = false; start.depth = 0; nextStack.Push(start); while (nextStack.Count != 0) { Sol sol = nextStack.Pop(); BFS.AddFirst("poped State:" + sol.ToString() + "level " + sol.depth); traversed.Push(sol); if (sol.Equals(goal)) { found = true; BFS.AddFirst("Goal:" + sol.ToString()); break; } else { sol.getneighbors(); foreach (Sol neighbor in sol.neighbors) { if (!neighbor.containedin(traversed) && !neighbor.containedin(nextStack)) { neighbor.depth = (sol.depth + 1); nextStack.Push(neighbor); } } } } return found; } public virtual bool depthFirst(Sol start, Sol goal) { Stack<Sol> nextStack = new Stack<Sol>(); Stack<Sol> traversed = new Stack<Sol>(); bool found = false; start.depth = 0; nextStack.Push(start); while (nextStack.Count != 0) { //Dequeue next State for comparison //And add it 2 list of traversed States Sol sol = nextStack.Pop(); DFS.AddFirst("poped State:" + sol.ToString() + "level " + sol.depth); traversed.Push(sol); if (sol.Equals(goal)) { found = true; DFS.AddFirst("Goal:" + sol.ToString()); break; } else { sol.getneighbors(); foreach (Sol neighbor in sol.neighbors) { if (!neighbor.containedin(traversed) && !neighbor.containedin(nextStack)) { neighbor.depth = sol.depth + 1; nextStack.Push(neighbor); } } } } return found; } public virtual bool iterativedeepening(Sol start, Sol goal) { bool found = false; for (int level = 0; ; level++) { Stack<Sol> nextStack = new Stack<Sol>(); Stack<Sol> traversed = new Stack<Sol>(); start.depth = 0; nextStack.Push(start); while (nextStack.Count != 0) { Sol sol = nextStack.Pop(); IDS.AddFirst("poped State:" + sol.ToString() + "Level" + sol.depth); traversed.Push(sol); if (sol.Equals(goal)) { found = true; IDS.AddFirst("Goal:" + sol.ToString()); break; } else if (sol.depth < level) { sol.getneighbors(); foreach (Sol neighbor in sol.neighbors) { if (!neighbor.containedin(traversed) && !neighbor.containedin(nextStack)) { neighbor.depth = sol.depth + 1; nextStack.Push(neighbor); } //end if } //end for each } //end else if } // end while if (found == true) break; } // end for return found; } } } Just wondering if I may be doing something wrong somewhere or something.

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• :focus in IE not working

  - by o-logn

  Hey, I've created a site with CSS that requires the :focus pseudo class. I change the 'filter' and 'background-image' effects when a textbox is selected (i.e. has focus). This works in Chrome/FF, but doesn't seem to work in IE8 (and, presumable, previous versions if IE). I tried to look for answers, and have tried to use :active - but that doesn't work. Is there a way of changing attributes such as 'filter' using psuedo-classes? Failing that, can I do it in JS with the OnClick event? Thanks

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• Java, filling arrays, and inheritance

  - by Arvanem

  Hi folks, I think I'm running into an inheritance conceptual wall with my Java arrays. I'm kind of new to Java so please tell me if I have things upside down. In essence, I want to do three things: Create a runnersArray with the attributes of my Runners class. Fill my runnersArray using my GenerateObjects method of my GenerateObjects class. Access the contents of my filled runnersArray in my Evaluating method of my Evaluating class. The problem seems to be that runnersArray is not visible to the methods in steps 2 and 3 above, but their classes (due to design reasons) cannot inherit or extend Runners class. Thanks in advance for any suggestions. Here are some code snippets showing what I'm trying to do: public class Runners extends Party { Runners[] runnersArray = new Runners[5]; } and public class GenerateObject extends /* certain parent class */ { public GenerateObject (int arrayNum) { runnersArray[arrayNum] = /* certain Runners attributes */; } } and public class Evaluating extends /*certain parent class*/ { public Evaluating (int arrayNum) { System.out.println(/* String cast attribute of runnersArray[arrayNum]*/; } }

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• Using OpenGL drawing operations in an object-oriented setting?

  - by Lion Kabob

  I've been plowing through basic shaders and whatnot for an application I'm writing, and I've been having trouble figuring out a high-level organization for the drawing calls. I'm thinking of having a singleton class which implements a number of basic drawing operations, taking data from "user" classes and passing that to the appropriate opengl calls. I'm wondering how people do this when writing their own applications, as the internet is chock full of basic "Your first shader" tutorials, but very little on suggested organization of drawing code. My particular environment is targeted at iPad/OpenGL ES 2.0, but I think the question stands for most environments.

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• Can nested attributes be used in combination with inheritance?

  - by FoxDemon

  I have the following classes: Project Person Person Developer Person Manager In the Project model I have added the following statements: has_and_belongs_to_many :people accepts_nested_attributes_for :people And of course the appropriate statements in the class Person. How can I add an Developer to a Project through the nested_attributes method? The following does not work: @p.people_attributes = [{:name => "Epic Beard Man", :type => "Developer"}] @p.people => [#<Person id: nil, name: "Epic Beard Man", type: nil>] As you can see the type attributes is set to nil instead of Developer.

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• optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?

  - by brahn

  I've been a bad kid and used the following syntax in my partial templates to set default values for local variables if a value wasn't explicitly defined in the :locals hash when rendering the partial -- <% foo = default_value unless (defined? foo) %> This seemed to work fine until recently, when (for no reason I could discern) non-passed variables started behaving as if they had been defined to nil (rather than undefined). As has been pointed by various helpful people on SO, http://api.rubyonrails.org/classes/ActionView/Base.html says not to use defined? foo and instead to use local_assigns.has_key? :foo I'm trying to amend my ways, but that means changing a lot of templates. Can/should I just charge ahead and make this change in all the templates? Is there any trickiness I need to watch for? How diligently do I need to test each one?

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• Work-around for PHP5's PDO rowCount MySQL issue

  - by Steven Surowiec

  I've recently started work on a new project using PHP5 and want to use their PDO classes for it. The problem is that the MySQL PDO Driver doesn't support rowCount() so there's no way to run a query and then get the number of affected rows, or rows returned, which is a pretty big issue as far as I'm concerned. I was wondering if anyone else has dealt with this before and what you've done to work around it. Having to do a fetch() or fetchAll() to check if any rows were affected or returned seems like a hack to me, I'd rather just do $stmt-numRows() or something similar.

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• Debug Mode for CodeIgniter?

  - by nebukadnezzar

  Does CodeIgniter provide a Debug Mode, for example, when accessing an Invalid URL? Ruby on Rails does show debugging Messages when a incorrect URL has been given, and the controller is unable to resolve it using the routes map. How would I enable such debugging messages in CodeIgniter? The profiler ... $this->output->enable_profiler(TRUE); ... only affects single classes, but not all routes. So debugging without an actual debugger mode is a little... difficult. :-)

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• Python: Can subclasses overload inherited methods?

  - by Rosarch

  I'm making a shopping cart app in Google App Engine. I have many classes that derive from a base handler: class BaseHandler(webapp.RequestHandler): def get(self, CSIN=None): self.body(CSIN) Does this mean that the body() method of every descendant class needs to have the same argument? This is cumbersome. Only one descendant actually uses that argument. And what about when I add new args? Do I need to go through and change every class? class Detail(BaseHandler): def body(self, CSIN): class MainPage(BaseHandler): def body(self, CSIN=None): #@UnusedVariable class Cart(BaseHandler): def body(self, CSIN): #@UnusedVariable

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• Java WebApp: Loading resource from .jar located in WEB-INF

  - by shaman.sir

  There are a lot of similar questions, but, probably, mine is a little bit different: What is the right way to load resource from inside of .jar file located in WEB-INF/lib folder (if I know the jar file name and the name of the class it resource belongs to), while Web Application is running? Should I use getServletContext().getResourceAsStream(?) for this purpose or the <name-of-known-class>.getResourseAsStream(?), and what path do I need to specify there? So, the structure is: /WEB-INF /classes /some/package/name ?.class #some Java code or Servlet that tries to read 'required-file.xml' /lib /<jar-with-known-name>.jar /another/package/with/known/name SomeKnownClass.class required-file.xml

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• Flex Error #1014: Class flash.net::NetStreamPlayOptions

  - by evilpenguin

  I have a pure ActionScript project. I'm using Flex Builder on a Mac, Flex SDK 3.4 and I've even added the playerglobal.swc from the Flash folder to the project's library path. I get autocomplete when I add import flash.net.NetStreamPlayOptions; import flash.net.NetStreamPlayTransitions; But when I run the movie, I get: VerifyError: Error #1014: Class flash.net::NetStreamPlayOptions could not be found. I don't get it.. What must I do to use those classes?

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• Embedding .net remoting program in WEB

  - by flufferok

  So, here is a deal. I have client-server application(dotNet remoting). Client side has few trackbars, checkboxes, buttons and picturebox. Server is a console application and does only calculation from client. Client's picturebox make some visualisation of calculation in picturebox. All calulations and relative classes are in dll file. Now I have to embed client application in web site. All kind of technologies are accepted, but I want to minimize forces applied to embedding. So, what is the best way to do embedding?

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