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• Using C++ is a Linked-List implementation without using pointers possible or not?

  - by sonicoder

  My question is very simply, can one using C++, implment a link-list data structure without using pointers (next nodes)? To further qualify my question, I'm mean can one create a Linked-List data structure using only class instantiations. A common node definition might be like so: template<typename T> struct node { T t; node<T>* next; node<T>* prev; }; I'm aware of std::list etc, I'm just curious to know if its possible or not - and if so how? code examples will be greatly appreciated.

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• What is good practice for writing web applications that control daemons (and their config files)

  - by Jones R

  Can someone suggest some basic advice on dealing with web applications that interact with configuration files like httpd.conf, bind zone files, etc. I understand that it's bad practice, in fact very dangerous to allow arbitrary execution of code without fully validating it and so on. But say you are tasked to write a small app that allows one to add vhosts to an apache configuration. Do you have your code execute with full privileges, do you write future variables into a database and have a cron job (with full privileges) execute a script that pulls the vars from the database and throws them into a template config file, etc. Some thoughts & contributions on this issue would be appreciated. tl;dr - how can you securely write a web app to update/create entries in a config file like apache's httpd.conf, etc.

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• As a Web Developer, how complicated is your average job? [closed]

  - by Daniel S

  Hey people, I'm 16 years old and I've recently started to do freelance jobs. I've been playing with PHP since I was 12 and I think that I can code reasonably well. So far, I've created a library for fetching info from LinkedIn profiles and some Wordpress plugins. Right now this client wants me to convert an HTML template into a Wordpress theme for using as a website. I feel this is a tad easy, so I wanted to ask, as professional web programmers, are most assignments harder than this?

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• How can I use a carriage return in a HTML tooltip ?

  - by ip

  Hi, I'm currently adding verbose tooltips to our site, and I'd like (without having to resort to a whizz-bang jQuery plugin, I klnow there are many!) to use carriage returns to format the tooltip. To add the tip I'm using the 'title' attribute. I've looked around the usual sites and using the basic template of: <a title='Tool?Tip?On?New?Line' >link with tip</a> I've tried replacing the '?' with: <br /> &013; / &#13; \r\n Environment.NewLine (I'm using C#) Neither work. Is it possible ?? WOW! Thanks all - 6 different answers in less than an hour. Thanks indeed!!

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• Jquery Conflicts with another Jquery Library

  - by Johangsl

  I am currently trying to implement a jquery slider into a joomla website. I already implemented NoConflict(); so that it doesn't step into joomla. And it works, BUT for another reason wich I do not understand it enters another jquery file called jsloader.js of a plugin I use for picture gallery display. I suppose all the module jquery files get preloaded before the one im calling inside the template. it enters the function() in the jsloader.js instead of the one in my jquery file. How Can I force it to enter my jquery file instead of other

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• How should I structure my iPhone OpenGL ES 1.1 game?

  - by Ryan

  I am building an iPhone OpenGL ES 1.1 game. I am using the OpenGL ES template provided by xcode. I am only using the ES1Renderer. I've coded some basic touch actions the user can take, and I've begun to think about the overall structure of the code. All I'm really doing is using C in the ES1Renderer.m for my entire game state. I have an array of bullet structs, an array on enemy structs, etc.. Besides using this structure, where my entire game state is in ES1Renderer.m as C arrays and structs, what other ways are there to structure the code? Should I be using C++ or Objective-C classes to represent the enemies so they are more modular? The main reason I ask this is because I don't normally code in C, C++ and Objective-C..so I am a little fuzzy on coming up with a good architecture here.

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• Doctrine: textarea line breaks & nl2br

  - by Tom

  Hi, I'm pulling my hair out with something that should be very simple: getting line breaks to show up properly in text that's returned from the database with Doctrine 1.2 I'm saving a message: $body = [text from a form textarea]; $m = new Message(); $m->setSubject($subject); $m->setBody($body); $m->save(); Querying the message: $q = Doctrine_Query::create() ->from('Message m') ->where('m.message_id = ?', $id) ->limit(1); $this->message = $q->execute(array(), Doctrine_Core::HYDRATE_ARRAY); In my template: echo $message[0]['body'] ... outputs the text without line breaks echo ln2br($message[0]['body']) ... no difference ... and I've tried every combination I could think of. Is Doctrine doing something to line breaks that's affecting this, or is there something that I'm just missing? Any help would be appreciated. Thanks.

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• How to make my WPF application as FAST as Outlook

  - by Raul Otaño

  The commons WPF applications take some time for loading medium complex views, once the view is loaded it works fine. For example in a Master - Detail view, if the Detail view is very complex and use different DataTemplates take some seconds (2-3 seconds) for load the view. When i open the Outlook application, for instance, it renders complex views and it is relative much more fast. Is there a way for increase the performance of my WPF application? Maybe a way for not loading the template's data every time that change the "master" item, and load it only one time in the app time live? i will appreciate any suggestion.

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• How do I implement jQuery image cycle loops on rollover for multiple thumbnail sets on a page?

  - by Kendrick Ledet

  Here is the Javascript I currently have <script type="text/javascript"> $(function() { $('.slideshow').hover( function() { $('.slides').cycle('resume'); }, function() { $('.slides').cycle('pause'); } ); $('.slides').cycle({ fx: 'fade', speed: .3, timeout: 280, next: '#next', prev: '#prev' }).cycle("pause"); }); </script> It works; but the thing is it works for all thumbnail sets on the page, and whenever I mouseover on one set of images, every other set of images loops as well. I do see that this is because I'm targeting classes, but my jQuery experience is quite limited so I have no idea how to only target a single instance of each class without effecting the others, and I can't go in and hardcode id's because my thumbnails and amount of videos on each page are determined dynamically via this Django template. http://pastebin.com/nf42bSAx I would greatly appreciate any help, as this is essential for my project (open source media platform). Thank you.

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• asp.net web form Cutom Router Handler

  - by jparram

  I am using a custom route handler for a webforms application. I am using routes to determine localization. ie: if the url has es or fr in the route it will load either spanish or french resources. for example: www.someroute/es/checkstuff/checkstuff.aspx will load: www.someroute/checkstuff/checkstuff.aspx with the spanish resources. I am configuring the custom routes in global.asax via: protected void Application_Start(object sender, EventArgs e) { RegisterRoutes(RouteTable.Routes); } public static void RegisterRoutes(RouteCollection routes) { foreach (var value in _customRoutes) { routes.Add(value.RouteName, new Route(value.Route, new CustomRouteHandler(value.ResolvedRoute))); } } where _customroutes is a list of routes. Is there a way to do this with some kind of pattern matching so I can avoid adding a specific route for each page in the application. While I know I could use a t4 template to generate the routes, I guess I am looking for a dynamic way to create the list

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• VBA - Prevent Excel 2007 from showing a defined names message box?

  - by John M

  I am working on a Excel 2007 workbook that will contain a macro to save the current sheet (a template) as a PDF file (no problem) a Excel 97-2003 file (problem) When saving the Excel file a messagebox appears asking about "Defined names of formulas in this workbook may display different values when they are recalculated...Do you want Excel to recalculate all formulas when this workbook is opened?". The user can then select Yes/No and then the file will save. How do I disable the messagebox from appearing? The default answer would be 'No'. My code for saving: Sub saveAs_97_2003_Workbook(tempFilePath As String, tempFileName As String) Dim Destwb As Workbook Dim SaveFormat As Long 'Remember the users setting SaveFormat = Application.DefaultSaveFormat 'Set it to the 97-2003 file format Application.DefaultSaveFormat = 56 ActiveSheet.Copy Set Destwb = ActiveWorkbook Destwb.CheckCompatibility = False With Destwb .SaveAs tempFilePath & tempFileName & ".xls", FileFormat:=56 .Close SaveChanges:=False End With 'Set DefaultSaveFormat back to the users setting Application.DefaultSaveFormat = SaveFormat End Sub

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• How to get the url of the page which is currently loading i the iframe

  - by Gayathri

  Hi, I have an requirement that, in my application on clicking an button i have to laod one more application with the same template which i was using for my application. So, on clicking the button in my application i have used one intermediate page in that using iframe i passed that URL of an external application. Its working fine. But the problem is in the external applicatio which is not in my control on clicking an button it is moving to next page. In that page i want to hide an button. I did that also using div tag color as white and set the positions. But the problem is in all the pages in the same position that is affecting. So i want to get the url of the page which is loading in the iframe on the second or third click of an external application, so that i can using some conditions i can hide the control. So please any one help me to get the solution for this problem

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• How to store data to Excel from DataSet without going cell-by-cell?

  - by Jason Barnwell

  Duplicate of: What’s the simplest way to import a System.Data.DataSet into Excel? Using c# under VS2008, we can create an excel app, workbook, and then worksheet fine by doing this: Application excelApp = new Application(); Workbook excelWb = excelApp.Workbooks.Add(template); Worksheet excelWs = (Worksheet)this.Application.ActiveSheet; Then we can access each cell by "excelWs.Cells[i,j]" and write/save without problems. However with large numbers of rows/columns, we are expecting a loss in efficiency. Is there a way to "data bind" from a DataSet object into the worksheet without using the cell-by-cell approach? Most of the methods we have seen at some point revert to the cell-by-cell approach. Thanks for any suggestions.

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• Not able to get the data from the JSON in OpenSocial App!

  - by Abhishek

  I have follwing JSON: {"mykey":[{name:"Jak",interests:"movies"}]} and following opensocial app code: <script type="text/os-template" require="mykey"> <ul> <li repeat="${mykey}"> <span>Offer id: ${Cur.name}</span> <span>Offer: ${Cur.interests}</span> </li> </ul> </script> but the App is not able to get the data from the JSON? Not able to find out the issue!

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• Is it any loose coupling mechanism in Objective-C + Cocoa like C# delegates or C++Qt signals+slots?

  - by Eye of Hell

  Hello. For a large programs, the standard way to chalenge a complexity is to divide a program code into small objects. Most of the actual programming languages offer this functionality via classes, so is Objective-C. But after source code is separated into small object, the second challenge is to somehow connect them with each over. Standard approaches, supported by most languages are compositon (one object is a member field of another), inheritance, templates (generics) and callbacks. More cryptic techniques include method-level delagates (C#) and signals+slots (C++Qt). I like the delegates / signals idea, since while connecting two objects i can connect individual methods with each over, without objects knowing anything of each over. For C#, it will look like this: var object1 = new CObject1(); var object2 = new CObject2(); object1.SomethingHappened += object2.HandleSomething; In this code, is object1 calls it's SomethingHappened delegate (like a normal method call) the HandleSomething method of object2 will be called. For C++Qt, it will look like this: var object1 = new CObject1(); var object2 = new CObject2(); connect( object1, SIGNAL(SomethingHappened()), object2, SLOT(HandleSomething()) ); The result will be exactly the same. This technique has some advantages and disadvantages, but generally i like it more than interfaces since if program code base grows i can change connections and add new ones without creating tons of interfaces. After examination of Objective-C i havn't found any way to use this technique i like :(. It seems that Objective-C supports message passing perfectly well, but it requres for object1 to have a pointer to object2 in order to pass it a message. If some object needs to be connected to lots of other objects, in Objective-C i will be forced to give him pointers to each of the objects it must be connected. So, the question :). Is it any approach in Objective-C programming that will closely resemble delegate / signal+slot types of connection, not a 'give first object an entire pointer to second object so it can pass a message to it'. Method-level connections are a bit more preferable to me than object-level connection ^_^.

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• How can I get Weblogic to connect to a RedBrick database?

  - by Scott

  I am trying to get Weblogic 9.2.3 to talk to a legacy RedBrick database and am having trouble. I have the redbrick.jar file from the software installation and have added to my APP_RUNTIME_CLASSPATH and my MANIFEST_CLASSPATH. This is my jConnect template line: <url>jdbc:rbw:protocol:${DB_LT_SERVER}:${DB_LT_PORT}/${DB_LT_NAME}</url> <driver-name>redbrick.jdbc.RBWDriver</driver-name> (Variables get replaced with good values during build.) When starting up I get this error: weblogic.common.ResourceException: Unknown Data Source jConnectLT weblogic.common.resourcepool.ResourceSystemException: Cannot load driver class: redbrick.jdbc.RBWDriver Do I have to do more to make Weblogic see the RedBrick database? Thanks for any tips or pointers.

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• Laravel Passing variable not working

  - by Friend

  Hello People here is my code i have used in controller... public function bulk() { return View::make('bulk')->with('message','hii there'); } my route file contains... Route::get('bulk',array('uses'=>'HomeController@bulk'))->before('auth'); In my view Iam testing it by ... @if(Session::has('message')) Present @else not Present @endif The page is making a view with the message 'not Present' why is it?? I even tried return Redirect::to('bulk')->with('message','hii there'); I get an erro mesage on Console mypro/public/bulk net::ERR_TOO_MANY_REDIRECTS What could be the problem?? is there any issues with name?? I tried this method earlier which worked fine for me.... :( Iam using Blade Template..

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• Difference between User Control and Custom Control Library

  - by Rod

  I'm working on creating a date/time user control in WPF using C# 2008. My first user control. I'm also using Matthew MacDonald's book, "Pro WPF in C# 2008". In that book he strongly recommended creating a user control using the WPF Custom Control Library project template; so I followed his suggestion. I've finished writing the code which would go into what I think of as the code-behind file. Now I'm ready to write the XAML. The only problem is, I just discovered there is no corresponding .xaml file? So, I don't get why using a WPF Custom Control Library project is better, or prefered, when writing a user control?

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• Is the use of union in this matrix class completely safe?

  - by identitycrisisuk

  Unions aren't something I've used that often and after looking at a few other questions on them here it seems like there is almost always some kind of caveat where they might not work. Eg. structs possibly having unexpected padding or endian differences. Came across this in a math library I'm using though and I wondered if it is a totally safe usage. I assume that multidimensional arrays don't have any extra padding and since the type is the same for both definitions they are guaranteed to take up exactly the same amount of memory? template<typename T> class Matrix44T { ... union { T M[16]; T m[4][4]; } m; }; Are there any downsides to this setup? Would the order of definition make any difference to how this works?

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• Django: optimizing queries

  - by Josh

  I want to list the number of items for each list. How can I find this number in a single query, rather than a query for each list? Here is a simplified version of my current template code: {% for list in lists %} <li> {{ listname }}: {% with list.num_items as item_count %} {{ item_count }} item{{ item_count|pluralize }} {% endwith %} </li> {% endfor %} lists is passed as: List.objects.filter(user=user) and num_items is a property of the List model: def _get_num_items(self): return self.item_set.filter(archived=False).count() num_items = property(_get_num_items) This queries SELECT COUNT(*) FROM "my_app_item" WHERE... n times, where n is the number of lists. Is it possible to make a single query here?

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• undefined method `events' for #<ActiveRecord::Relation:0x4177518> -rails 3.0.3

  - by brg

  I am having this unexplained NoMethodError with undefined method `events' for #. I don't know why since my model association are well defined and the event table has the foreign keys for the user table. I tried using this fix but it failed: Rails 3 ActiveRecord::Relation random associations behavior event.rb class Event < ActiveRecord::Base belongs_to :user attr_accessible :event_name, :Starts_at, :finish, :tracks end user.rb class User < ActiveRecord::Base has_many :events, :dependent = :destroy attr_accessible :name, :event_attributes accepts_nested_attributes_for :events, :allow_destroy = true end schema.rb ActiveRecord::Schema.define(:version = 20101201180355) do create_table "events", :force = true do |t| t.string "event_name" t.string "tracks" t.datetime "starts_at" t.datetime "finish" t.datetime "created_at" t.datetime "updated_at" t.integer "user_id" end end error message NoMethodError in Users#index undefined method `events' for # Extracted source (around line #10): 7: <%= sortable "Tracks" % 8: 10: <% @users.events.each do |event| % 11: <% debugger % 12: 13: <%= event.starts_at % Trace of template inclusion: app/views/users/index.html.erb Rails.root: C:/rails_project1/events_manager Application Trace | Framework Trace | Full Trace app/views/users/_event_user.html.erb:10:in _app_views_users__event_user_html_erb__412443848_34308540_1390678' app/views/users/index.html.erb:7:in_app_views_users_index_html_erb___603337143_34316016_0'

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• Automatic VisualState Manager in Silverlight

  - by Matt

  If you create a simple button and then choose Edit Template - Edit a Copy, Blend will automatically generate a style area, along with all the button states (MouseEnter, MouseLeave, Pressed, etc). No where in the code behind or auto generated style area does it say that on a "MouseOver" event, change the state to "MouseOver", but it still manages to work! Is the only way to change a button's state have to be done the code behind using the VisualStateManager.GoToState method, or can you change it much like CSS does (a:hover) using the VisualStateManager? From my experience, setting just doesn't seem to do the trick.

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• Problem installing wordpress child themes.

  - by Jay

  Hi, I've tried to install either the Fusion or Thematic child themes for my blog. My Wordpress directory is located at myblog/wordpress while my domain is just myblog (example). Everything works fine with both basic themes or the parent Fusion or Thematic themes. When I install a child theme for either framework, I can view the preview and select 'activate.' However, after that my entire site crashes. I can't even view the wordpress admin panel. I've had to restore my database from my hosting provider just to get my blog working. All that I'm able to see is my favicon icon and a blank page. I've tried to deactivate all plugins and this doesn't help either. I really want to use the Hybrid News child template. Any thoughts on what might be happening? thanks so much!

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• WP7 - attempt to select and use application static resource in codebehind not working (no resources found).

  - by pearcewg

  With Windows Phone 7, I'm attempting to dynamically add controls to and object in codebehind, and apply a StaticResource to the new control. Xaml file sample: <phone:PhoneApplicationPage.Resources> <ControlTemplate x:Key="PushpinControlTemplateBlue" TargetType="my2:Pushpin"> ... </ControlTemplate> </phone:PhoneApplicationPage.Resources> Codebehind sample: >Pushpin myPush = new Pushpin(); >myPush.Location = new GeoCoordinate(52.569593, -0.9261151403188705); >myPush.Content = ""; >myPush.Template = (ControlTemplate)Application.Current.Resources["PushpinControlTemplateBlue"]; >mapMain.Children.Add(myPush); When I debug, and look at "Application.Current.Resources", there are no items in the collection, so the item is added to the controls list, but doesn't show up because it has no content. Is there something simple I'm doing wrong? How do I correctly access the resource?

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• How to retrieve all keys (or values) from a std::map?

  - by Owen

  This is one of the possible ways I come out: struct RetrieveKey { template <typename T> typename T::first_type operator()(T keyValuePair) const { return keyValuePair.first; } }; map<int, int> m; vector<int> keys; // Retrieve all keys transform(m.begin(), m.end(), back_inserter(keys), RetrieveKey()); // Dump all keys copy(keys.begin(), keys.end(), ostream_iterator<int>(cout, "\n")); Of course, we can also retrieve all values from the map by defining another functor RetrieveValues. Is there any other way to achieve this easily? (I'm always wondering why std::map does not include a member function for us to do so.)

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