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Figuring out what makes a C++ class abstract in VS2008

- by suszterpatt

I'm using VS2008 to build a plain old C++ program (not C++/CLI). I have an abstract base class and a non-abstract derived class, and building this: Base* obj; obj = new Derived(); fails with the error "'Derived': cannot instantiate abstract class". (It may be worth noting, however, that if I hover over Base with the cursor, VS will pop up a tooltip saying "class Base abstract", but hovering over Derived will only say "class Derived" (no "abstract")). The definitions of these classes are fairly large and I'd like to avoid manually checking if each method has been overridden. Can VS do this for me somehow? Any general tips on pinpointing the exact parts of the class' definition that make it abstract?

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How do I create an ant builder file (build.xml) for an existing Java project?

- by Amir Rachum

Hi all, I am working on an Java assignment for a software design course in my university. It's not really complicated and it includes some classes, interfaces and jUnit test cases. We we're now told we should supply a build.xml file as an input for an ant builder. I have never heard of or used ant before. I also saw Eclipse supports it. My question is - What does build.xml does? How does Eclipse builds my project and why not do the same instead of using ant? And most important - how to create this file with Eclipse? Thanks.

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Access Relationship Table in Grails

- by WaZ

Hi, I have the following domains classes: class Posts{ String Name String Country static hasMany = [tags:Tags] static constraints = { } } class Tags{ String Name static belongsTo = Posts static hasMany = [posts:Posts] static constraints = { } String toString() { "${TypeName}" } } Grails creates an another table in the database i.e. Posts_Tags. My requirement is: E.g. 1 post has 3 tags. So, in the Posts_Tags table there are 3 rows. How can I access the table Posts_Tags directly in my code so that I can manipulate the data or add some more fields to it.

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Sleep a thread until an event is attended in another thread from a different class

- by Afro Genius

I have an application that fires 2 threads, the 1st launches another class to do some processing which in turn launches a 3rd class to do yet more processing. The 2nd thread in the main class should wait until some event in the 3rd class completes before it performs its job. How can this be achieved? I had tried implementing a wait/notify to share a lock object between the two threads but technically this will not work as I found the hard way. Can I share a lock between classes? Note, an instance of the 3rd class is declared in the 1st class and passed as parameter to the 2nd class. Also I tried creating boolean value in 3rd class that tells when event is complete then poll 2nd thread till this value is true. This worked but is not very desirable. Also is actionListner a better approach to this problem?

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How do I dynamically point an interface to a specific class at runtime?

- by Jon

As a simple example, I have an xml file with a list of names of classes which actually carry out the work and all implement interface IDoWork with a method Process(). I loop through the items in the xml file. How do I actually dynamically assign the class to the interface from a string name? e.g. var IDoWork = new "DoWorkType1"(); IDoWork.Process(); <work> <item id="DoWorkType1"> </item> <item id="DoWorkType2"> </item> </work> I want to achieve a plugin type architecture, except the plugin isn't at an assembly level only a class level within my program.

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Java or Groovy CMS

- by Don

Hi, I'm considering developing a school information system using the Grails web framework. Before a school can use the system, they will need to setup the following data School data Students Teachers Subjects Classes etc. I'm considering using a CMS in order to get the ability to CRUD these entities "for free". The CMS may also provide other features out-of-the-box that I could use. Ideally the CMS should be implemented in Java or Groovy, does anyone know of something suitable? I looked at the Weceem CMS plugin for Grails, but it's missing some core concepts I need, e.g. the ability to add users to groups. Thanks, Don

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undefined reference to static member variable

- by Max

Hi. I have this class that has a static member. it is also a base class for several other classes in my program. Here's its header file: #ifndef YARL_OBJECT_HPP #define YARL_OBJECT_HPP namespace yarlObject { class YarlObject { // Member Variables private: static int nextID; // keeps track of the next ID number to be used int ID; // the identifier for a specific object // Member Functions public: YarlObject(): ID(++nextID) {} virtual ~YarlObject() {} int getID() const {return ID;} }; } #endif and here's its implementation file. #include "YarlObject.hpp" namespace yarlObject { int YarlObject::nextID = 0; } I'm using g++, and it returns three undefined reference to 'yarlObject::YarlObject::nextID linker errors. If I change the ++nextID phrase in the constructor to just nextID, then I only get one error, and if I change it to 1, then it links correctly. I imagine it's something simple, but what's going on?

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Style all anchors except those that contain images, without adding class or id to the image tag?

- by Deca

With the example below, I need to add padding and background-color properties to the text anchor. I then need to exclude padding and background-color from anchors that contain images. <p> <a href="#">this is a text link that needs to be styled</a> <a href="#"><img src="image/name.jpg" alt="this needs to be excluded from styling" /></a> </p> If I have a red background and padding on my text links, I do not want that same red background and padding to appear on my linked images. The images will always be in their own anchors, not mixed with text within the same anchor. The rub is that I can not add classes or IDs to the img tags - I do not have edit control of that data. So how can I add CSS attributes to all anchors, while excluding anchors that contain images?

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How do I prevent an https response from throwing an AuthenticationException with Fiddler running?

- by Ichabod Clay

Relative newbie to C# here :) I'm currently creating a web link scraper and having issues with the responses I'm getting when trying to login to the website via my program. I'm trying to use Fiddler to see if my program is sending the proper data, but my program is throwing an AuthenticationException when trying to get a response from the site with Fiddler running. The requests are being sent over HTTPS and Fiddler's certificate is the cause of the excepting being thrown. My question is, what can I implement into my program to have it disregard the certificate authentication? As far as my program goes, the requests and responses are being handled by HttpWebRequest and HttpWebResponse classes.

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Is it possible to apply inheritance to a Singleton class?

- by Bragaadeesh

Hi, Today I faced one question in interview. Is it possible to apply inheritance concept on Singleton Classes. I said since the constructor is private, we cannot extend that Singleton class (can someone please validate this). Next thing he asked me is to apply inheritance on that Singleton class. So, I made the Singleton's constructor as protected thinking that child's constructor also has be protected. But I was wrong the child can have a modifier either equal to or higher than that. So, I asked him to give a real world example on such a case. He was not able to give me one and said that I cant ask questions and wanted me to tell whether this scenario is possible or not. I went kind of blank. My question here is, Is this possible? Even if its possible, what is the use of it? What real world scenario would demand such a use. Thanks

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Overriding setter on domain class in grails 1.1.2

- by Pavel P

I have following two domain classes in Grails 1.1.2: class A implements Serializable { MyEnumType myField Date fieldChanged void setMyField(MyEnumType val) { if (myField != null && myField != val) { myField = val fieldChanged = new Date() } } } class B extends A { List children void setMyField(MyEnumType val) { if (myField != null && myField != val) { myField = val fieldChanged = new Date() children.each { child -> child.myField = val } } } When I set B instance's myField, I get the setter into the cycle... myField = val line calls setter again instead of assiging the new value. Any hint how to override the setter correctly? Thanks

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How to translate such AS3 class into C#?

- by Ole Jak

So I try to create opensource C# project for slicing FLVs I began with translating of existing project called flvslicer Can any one please help me with translating one of their classes package org.bytearray.video.events { import flash.events.Event; import flash.utils.ByteArray; public final class MergedEvent extends Event { public var time:Number; public var stream:ByteArray; public static const COMPLETE:String = "mergeComplete"; public function MergedEvent(type:String, stream:ByteArray, duration:Number) { super(type, false, false); // base this.stream = stream; this.time = duration; } } }

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Two collections manyToOne to same primary key

- by Ethiel

Hi, guys, I'm coding a web page in Hibernate-JPA and Oracle. I need the following: I have two classes: Place and Home. I need two collections of type Place in every Home: I do the following: Home: @ManyToOne @JoinColumn(name="ID_PLACES") private List<Places>places1; @ManyToOne @JoinColumn(name="ID_PLACES") private List<Places>Places2; However, hibernate got an exception (repeated column) and forces to me to mapping with insert and update to false. How Can I get Two ManyToOne relationship to same primary key with insert a true?.

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I get an `Cannot read property 'slice' of undefined` message when I use the scrollTo jQuery plugin inside this function

- by alexchenco

I'm using the jQuery scrollTo plugin. I get this error in my JS Console: 16827Uncaught TypeError: Cannot read property 'slice' of undefined d.fn.scrollToindex.html.js:16827 jQuery.extend.eachindex.html.js:662 d.fn.scrollToindex.html.js:16827 jQuery.extend.eachindex.html.js:662 jQuery.fn.jQuery.eachindex.html.js:276 d.fn.scrollToindex.html.js:16827 popupPlaceindex.html.js:18034 (anonymous function)index.html.js:17745 jQuery.extend._Deferred.deferred.resolveWithindex.html.js:1018 doneindex.html.js:7247 jQuery.ajaxTransport.send.script.onload.script.onreadystatechange When I place $(".menu").scrollTo( $("li.matched").attr("id"), 800 ); inside it. function popupPlace(dict) { $popup = $('div#dish-popup'); $popup.render(dict,window.dishPopupTemplate); if(typeof(dict.dish) === 'undefined') { $popup.addClass('place-only'); } else { $popup.removeClass('place-only'); } var $place = $('div#dish-popup div.place'); var place_id = dict.place._id; if(liked[place_id]) { $place.addClass('liked'); } else { $place.removeClass('liked'); } if(dict.place.likes) { $place.addClass('has-likes'); } else { $place.addClass('zero-likes'); } var tokens = window.currentSearchTermTokens; var tokenRegex = tokens && new RegExp($.map(tokens, RegExp.escape).join('|'), 'gi'); $.each(dict.place.products, function(n, product) { $product = $('#menu-item-'+product.id); if(liked[place_id+'/'+product.id]) { $product.addClass('liked'); } if(tokens && matchesDish(product, tokens)) { $product.addClass('matched'); $product.highlight(tokenRegex); } else { $product.removeClass('matched'); $product.removeHighlight(); } if(product.likes) { $product.addClass('has-likes'); } else { $product.addClass('zero-likes'); } }); $('#overlay').show(); $('#dish-popup-container').show(); // Scroll to matched dish //$("a#scrolll").attr("href", "#" + $("li.matched").attr("id")); //$("a#scrolll").attr("href", "#" + $("li.matched").attr("id")); //$("a#scrolll").trigger("click"); $(".menu").scrollTo( $("li.matched").attr("id"), 800 ); // Hide dish results on mobile devices to prevent having a blank space at the bottom of the site if (Modernizr.mq('only screen and (max-width: 640px)')) { $('ol.results').hide(); } $(".close-dish-popup").click(function() { $("#overlay").hide(); $("#dish-popup-container").hide(); $('ol.results').show(); changeState({}, ['dish', 'place', 'serp']); }); showPopupMap(dict.place, "dish-popup-map"); } Any suggestion to fix this?

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Receive messages for derived types in MVVMLight

- by Hrvoje

Shouldn't this test pass: [TestMethod] public void derived_message_subscription() { bool handled = false; Messenger.Default.Register<GenericMessage<baseClass>>(this, true, (msg) => handled = true); Messenger.Default.Send(new GenericMessage<testClass>(new testClass())); Assert.IsTrue(handled); } public abstract class baseClass { } public class testClass : baseClass { } I have to receive all messages for classes that inherits from one base class. MVVMLight has bool property receiveDerivedMessagesToo in Register method, but it seems to me that it isn't working.

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Is there a server side API for Team Foundation Server?

- by Ralph Shillington

It would seem there is precious little documentation on programming against a TFS 2010 instance. What bits I have found, have next to nothing in the case of documentation beyond barebones listing of client access classes and their members, most likely autogenerated from the code comments. As I'm interested in building a silverlight client against TFS, I will need access to a server side API. Ideally the silverlight app will talk to my server (mainly for work items) and my server will in turn talk to the TFS server for the goods. Where is the doumentation (if any) for this kind of TFS integration?

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QWebPage. How to handle failed request.

- by user453482

I want to handle failed requests (for example, with http 404 error code in reply), display my own "notfound.html" page in QWebView. But there is no simple way to handle replies with QWebView/QWebPage classes. As I see in Arora browser, for such requests uses next mechanism: QWebPage::setForwardUnsupportedContent(true), QWebPage::unsupportedContent signal and appropriate slot where you can handle qnetworkreply manually. But I cannot understand how it works, because unsupportedContent throws only when QWebPage cannot handle request scheme (like abrakadra://, ftp://, etc) or if reply consists of special header Content-Disposition: attachment. May be anybody know something about this ?

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jquery: addClass 1,2,3 etc. auto to a list

- by Svensson

Hello, is it possible, to add auto numeric classes to a list by using jquery? html: <ul id="list"> <li>Element 1</li> <li>Element 2</li> <li>Element 3</li> <li>Element 4</li> <li>Element 5</li> </ul> i want to get something like this: <ul id="list"> <li class="1">Element 1</li> <li class="2">Element 2</li> <li class="3">Element 3</li> <li class="4">Element 4</li> <li class="5">Element 5</li> </ul> hope there is a solution available :-)

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Call AppDelegate Method from Class

- by golfromeo

Basically, I need to call a method in my AppDelegate from one of my view controller classes. Currently, I'm doing the following: myAppDelegate *appDelegate = (myAppDelegate *)[[UIApplication sharedApplication] delegate]; [appDelegate doMethod]; And including the myAppDelegate.h at the top of the .m file of the class: #import "myAppDelegate.h" When I run it, everything works... But I get the following warning: warning 'myAppDelegate' may not respond to '-doMethod' Is there another way that I should reference the app delegate? Thanks for any help in advance.

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Problem overridding virtual function

- by William

Okay, I'm writing a game that has a vector of a pairent class (enemy) that s going to be filled with children classes (goomba, koopa, boss1) and I need to make it so when I call update it calls the childclasses respective update. I have managed to create a example of my problem. #include <stdio.h> class A{ public: virtual void print(){printf("Hello from A");} }; class B : public A{ public: void print(){printf("Hello from B");} }; int main(){ A ab = B(); ab.print(); while(true){} } Output wanted: "Hello from B" Output got: "Hello from A" How do I get it to call B's print function?

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WAS Non-HTTP activation - hooking application startup

- by Mike Tours

I'm trying to integrate a netTcpBinding based application that is hosted inside WAS with an IoC container (autofac/spring). Unfortunately, when it starts inside WAS and due to the fact that it is not an Http based application, no events are fired inside the Global application class. I need to catch the application domain startup so that I can configure the IoC container. Is there any way to do this when hosting in WAS? I've seen horrible things involving using static classes inside App_Code folders, but I'd like something somewhat more testable and not quite as dirty.

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How do you overide a class that is called by another class with parent::method

- by dan.codes

I am trying to extend Mage_Catalog_Block_Product_View I have it setup in my local directory as its own module and everything works fine, I wasn't getting the results that I wanted. I then saw that another class extended that class as well. The method I am trying to override is the protected function _prepareLayout() This is the function class Mage_Review_Block_Product_View extends Mage_Catalog_Block_Product_View protected function _prepareLayout() { $this->getLayout()->createBlock('catalog/breadcrumbs'); $headBlock = $this->getLayout()->getBlock('head'); if ($headBlock) { $title = $this->getProduct()->getMetaTitle(); if ($title) { $headBlock->setTitle($title); } $keyword = $this->getProduct()->getMetaKeyword(); $currentCategory = Mage::registry('current_category'); if ($keyword) { $headBlock->setKeywords($keyword); } elseif($currentCategory) { $headBlock->setKeywords($this->getProduct()->getName()); } $description = $this->getProduct()->getMetaDescription(); if ($description) { $headBlock->setDescription( ($description) ); } else { $headBlock->setDescription( $this->getProduct()->getDescription() ); } } return parent::_prepareLayout(); } I am trying to modify it just a bit with the following, keep in mind I know there is a title prefix and suffix but I needed it only for the product page and also I needed to add text to the description. class MyCompany_Catalog_Block_Product_View extends Mage_Catalog_Block_Product_View protected function _prepareLayout() { $storeId = Mage::app()->getStore()->getId(); $this->getLayout()->createBlock('catalog/breadcrumbs'); $headBlock = $this->getLayout()->getBlock('head'); if ($headBlock) { $title = $this->getProduct()->getMetaTitle(); if ($title) { if($storeId == 2){ $title = "Pool Supplies Fast - " .$title; $headBlock->setTitle($title); } $headBlock->setTitle($title); }else{ $path = Mage::helper('catalog')->getBreadcrumbPath(); foreach ($path as $name => $breadcrumb) { $title[] = $breadcrumb['label']; } $newTitle = "Pool Supplies Fast - " . join($this->getTitleSeparator(), array_reverse($title)); $headBlock->setTitle($newTitle); } $keyword = $this->getProduct()->getMetaKeyword(); $currentCategory = Mage::registry('current_category'); if ($keyword) { $headBlock->setKeywords($keyword); } elseif($currentCategory) { $headBlock->setKeywords($this->getProduct()->getName()); } $description = $this->getProduct()->getMetaDescription(); if ($description) { if($storeId == 2){ $description = "Pool Supplies Fast - ". $this->getProduct()->getName() . " - " . $description; $headBlock->setDescription( ($description) ); }else{ $headBlock->setDescription( ($description) ); } } else { if($storeId == 2){ $description = "Pool Supplies Fast: ". $this->getProduct()->getName() . " - " . $this->getProduct()->getDescription(); $headBlock->setDescription( ($description) ); }else{ $headBlock->setDescription( $this->getProduct()->getDescription() ); } } } return Mage_Catalog_Block_Product_Abstract::_prepareLayout(); } This executs fine but then I notice that the following class Mage_Review_Block_Product_View_List extends which extends Mage_Review_Block_Product_View and that extends Mage_Catalog_Block_Product_View as well. Inside this class they call the _prepareLayout as well and call the parent with parent::_prepareLayout() class Mage_Review_Block_Product_View_List extends Mage_Review_Block_Product_View protected function _prepareLayout() { parent::_prepareLayout(); if ($toolbar = $this->getLayout()->getBlock('product_review_list.toolbar')) { $toolbar->setCollection($this->getReviewsCollection()); $this->setChild('toolbar', $toolbar); } return $this; } So obviously this just calls the same class I am extending and runs the function I am overiding but it doesn't get to my class because it is not in my class hierarchy and since it gets called after my class all the stuff in the parent class override what I have set. I'm not sure about the best way to extend this type of class and method, there has to be a good way to do this, I keep finding I am running into issues when trying to overide these prepare methods that are derived from the abstract classes, there seems to be so many classes overriding them and calling parent::method. What is the best way to override these functions?

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Validating call to web service against schema before sending request

- by Cen

I am calling a web service (written in Java) in my web app. I use the WSDL to generate proxy classes using the wsdl.exe command line tool. Everything is working fine. However, I have found out that the web service is not doing any data validation at all when they receive a request from my app. Hence, if I happen to send one minute piece of data that isn't exactly what they want, I receive a general fault error in return, with no specifics at all of what the incorrect (if any) piece of data is. So, before I make the request, I'd like to validate my request against the schema they have provided. Is this possible, and if so, how do I go about this? Thanks in advance

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Nonstatic conversion functions; Casting different types, e.g. DirectX vector to OpenGL vector

- by Markus

I am currently working on a game "engine" that needs to move values between a 3D engine, a physics engine and a scripting language. Since I need to apply vectors from the physics engine to 3D objects very often and want to be able to control both the 3D, as well as the physics objects through the scripting system, I need a mechanism to convert a vector of one type (e.g. vector3d<float>) to a vector of the other type (e.g. btVector3). Unfortunately I can make no assumptions on how the classes/structs are laid out, so a simple reinterpret_cast probably won't do. So the question is: Is there some sort of 'static'/non-member casting method to achieve basically this: vector3d<float> operator vector3d<float>(btVector3 vector) { // convert and return } btVector3 operator btVector3(vector3d<float> vector) { // convert and return } Right now this won't compile since casting operators need to be member methods. (error C2801: 'operator foo' must be a non-static member)

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Mapping enum to a table with hibernate annotation

- by Thierry-Dimitri Roy

I have a table DEAL and a table DEAL_TYPE. I would like to map this code: public class Deal { DealType type; } public enum DealType { BASE("Base"), EXTRA("Extra"); } The problem is that the data already exist in the database. And I'm having a hard time mapping the classes to the database. The database looks something like that: TABLE DEAL { Long id; Long typeId; } TABLE DEAL_TYPE { Long id; String text; } I know I could use a simple @OneToMany relationship from deal to deal type, but I would prefer to use an enum. Is this possible? I almost got it working by using a EnumType.ORDINAL type. But unfortunately, my IDs in my deal type table are not sequential, and do not start at 1. Any suggestions?

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