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• objective-C : Reset tableview loaded with feltching objects (core data)

  - by the1nz4ne

  hi, i have a tableview application loaded with core data feltching objects and i wanna know if it is possible to reset the table with a simple button. Thanks code to add an object : NSManagedObjectContext *context = [fetchedResultsController managedObjectContext]; NSEntityDescription *entity = [[fetchedResultsController fetchRequest] entity]; NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context]; [newManagedObject setValue:string forKey:@"timeStamp"]; my code to delete (one) object: NSManagedObjectContext *context = [fetchedResultsController managedObjectContext]; [context deleteObject:[fetchedResultsController objectAtIndexPath:indexPath]]; i want a button that reset the tableview and delete everything thanks

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• C# how to correctly dispose of an SmtpClient?

  - by JL

  VS 2010 code analysis reports the following: Warning 4 CA2000 : Microsoft.Reliability : In method 'Mailer.SendMessage()', object 'client' is not disposed along all exception paths. Call System.IDisposable.Dispose on object 'client' before all references to it are out of scope. My code is : public void SendMessage() { SmtpClient client = new SmtpClient(); client.Send(Message); client.Dispose(); DisposeAttachments(); } How should I correctly dispose of client? Update: to answer Jons question, here is the dispose attachments functionality: private void DisposeAttachments() { foreach (Attachment attachment in Message.Attachments) { attachment.Dispose(); } Message.Attachments.Dispose(); Message = null; }

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• Bidirectional one-to-many associations with indexed collections in NHibernate

  - by Jørn Schou-Rode

  Last summer, I asked a question regarding how to add new object to an IList mapped as a one-to-many with NHibernate. One of the answers let me to this paragraph in the documentation: Please note that NHibernate does not support bidirectional one-to-many associations with an indexed collection (list, map or array) as the "many" end, you have to use a set or bag mapping. While I am pretty sure I understand what this paragraph says, I have no idea why or how to work around this limitation. As I am now again working with a model that seems to require a "bidirectional one-to-many association with an index collection", I figured the time was right for follow-up questions: Why does NHibernate have this limitation on associations? It is my impression that the guys behind NHibernate are quite clever, so I assume there is a pretty good reason. What are the common workarounds for this shortcoming? Making the collection a non-indexed bag and adding an explicit Position property to the child class? Any better solutions?

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• Page Lifecycle - Using FindControl to reference a control created programatically during page load

  - by Jay Wilde

  Hi, I'm creating some text boxes on my form programatically which I need to reference later using FindControl. I've put the FindControl instruction in the page load method after the code which creates them but get an error: "Object reference not set to an instance of an object." I assume this is because the textbox controls are not created until later in the lifecycle and therefore cannot be referenced from within Page_Load. Can someone advise where in my code-behind I would need to place the FindControl instruction so that it can find these programatically created text boxes?

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• Flex Force Decimal

  - by babyangel86

  Hi, I'm looking for a regex or a way to format the NumberValidator so that only decimal places are allowed. The domain="real" allows you to put integer values, but I need to force the user to but in 2.0 if they want an integer. This is because they pass through a Castor mapping file, it complains if it gets an integer when it expects a decimal. I dont want to restrict the number of decimal places, just insist that there must be a point, and a number after it. Any help would be much appreciated.

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• Search over multiple fields

  - by schneck

  Hi there, I think I don't unterstand django-haystack properly: I have a data model containing several fields, and I would to have two of them searched: class UserProfile(models.Model): user = models.ForeignKey(User, unique=True, default=None) twitter_account = models.CharField(max_length=50, blank=False) My search index settings: class UserProfileIndex(SearchIndex): text = CharField(document=True, model_attr='user') twitter_account = CharField(model_attr='twitter_account') def get_queryset(self): """Used when the entire index for model is updated.""" return UserProfile.objects.all() But when I perform a search, only the field "username" is searched; "twitter_account" is ignored. When I select the Searchresults via dbshell, the objects contain the correct values for "user" and "twitter_account", but the result page shows a "no results": {% if query %} <h3>Results</h3> {% for result in page.object_list %} <p> <a href="{{ result.object.get_absolute_url }}">{{ result.object.id }}</a> </p> {% empty %} <p>No results</p> {% endfor %} {% endif %} Any ideas?

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• Binding list of objects to WPF ListView

  - by Dave Colwell

  Hi all, I have a list of objects which i want to bind to a ListView control in my WPF application. The Objects have a DataTemplate already, so no need to define that. The list of objects is a property in the codebehind file in the format list<object> When i add one object programatically, it appears fine. But when i try to bind the ItemSource of the ListBox to the list of objects, nothing shows up. I am using the following binding: ItemsSource="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=Portfolios}" where the name of the property i am trying to bind to is Portfolios and exists on the parent window

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• Custom fine-grained claims based authorization system in ASP.NET MVC - wheres and hows

  - by BuzzBubba

  So, I'd like to implement my own custom authorization system in MVC2. If I'd have to create a global class, where do I instantiate it? Can HttpContext be extended with my own additions and where do I do that? Should I use Authorization filters for rights validation or ActionFilters or do it within an action? Can ActionFilter pass any data to the action itself? Previously (in WebForms) I was using a Session object where I would put a serialized object containing essential user data (account id and a list of roles and rights) and I'd extend my own Page class.

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• Have boost effect on lucene/compass field search.

  - by PeterP

  Hi there, In our compass mapping, we're boosting "better" documents to push them up in the list of search results. Something like this: <boost name="boostFactor" default="1.0"/> <property name="name"><meta-data>name</meta-data></property> While this works fine for fulltext search, it does not when doing a field search, e.g. the boost is ignored when searching something like name:Peter Is there any way to enable boosting for field searches? Thanks for your help and sorry if this is a dumb question - I am new to Lucene/Compass. Best regards, Peter

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• How do I make my NSNotification trigger a selector?

  - by marty

  Here's the code: - (void)viewDidLoad { [super viewDidLoad]; NSURL *musicURL = [NSURL URLWithString:@"http://live-three2.dmd2.ch/buureradio/buureradio.m3u"]; if([musicURL scheme]) { MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] initWithContentURL:musicURL]; if (mp) { // save the music player object self.musicPlayer = mp; [mp release]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(popBack:) name:@"MPMoviePlayerDidExitFullscreenNotification" object:nil]; // Play the music! [self.musicPlayer play]; } } } -(void)popBack:(NSNotification *)note { [self.navigationController popToRootViewControllerAnimated:YES]; } The selector method never gets called. I just want to pop back to the root menu when the "Done" button is pressed on the movie player. I put an NSLog in the selector to check if it was even being called, nothing. The music plays fine. Any thoughts?

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• MAD method compression function

  - by Jacques

  I ran across the question below in an old exam. My answers just feels a bit short and inadequate. Any extra ideas I can look into or reasons I have overlooked would be great. Thanx Consider the MAD method compression function, mapping an object with hash code i to element [(3i + 7)mod9027]mod6000 of the 6000-element bucket array. Explain why this is a poor choice of compression function, and how it could be improved. I basically just say that the function could be improved by changing the value for p (or 9027) to an prime number and choosing an other constant for a (or 3) could also help.

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• How to pass the parameter in SQL query from PowerShell

  - by Zshava

  I have this code in PowerShell, that executes SQL query for UPDATE table: $Connection=new-object data.sqlclient.sqlconnection "server=server;database=mydb;trusted_connection=true;" $Connection.open() For( $i = 0; $i -le $ActID.Length; $i ++ ){ $cmd = New-Object System.Data.SqlClient.SqlCommand $cmd.Connection = $Connection $cmd.CommandText = " update Table set Note = @PATH " $cmd.Parameters.Add("@PATH", $ActID[$i].Values) | Out-Null $cmd.ExecuteNonQuery() } I try to update table with variable defined in this string: $cmd.Parameters.Add("@PATH", $ActID[$i].Values) | Out-Null But when i try to execute script, error log says that there is no value passed in $ActID[$i] Is there other methods to pass parameters (variables) in powershell queries?

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• Global Timer in Javascript with Multiple Callbacks

  - by Mike Beepo

  I want to create a global timer object in javascript and then be able to add callbacks to it on the fly. This way I can just use one global timer in my script to execute all actions at a certain interval rather than wasting resources by using multiples. This is how I want to be able to piece things together: var timer = new function() { clearInterval( this.interval ); //[1] At this point I want the Callbacks to be run var self = this; setTimeout(function() {self.timer()}, 200); } function otherObject = new function() { //When created I want to bind my object's function called cb to the global timer at [1] } otherObject.prototype.cb = function() { //Stuff that should be done every time the timer is run } var someObject = new otherObject(); How would I make it possible bind any number functions (most of which are functions within other objects) to run at the interval of my timer on the fly?

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• Finding distance travelled by robot using Optical Flow

  - by user280454

  Hi, I'm working on a project right now in which we are developing an autonomous robot. I have to basically find out the distance travelled by the robot between any 2 intervals. I'm using OpenCV, and using the Optical Flow functions of OpenCV, I'm able to find out the velocity/distance of each pixel in 2 different images. Using this information, I want to be able to find out the distance travelled by the robot in the interval between those 2 images. I thought of a way in which we could develop an input output mapping between the distance travelled by pixels and the distance travelled by the bot (using some tests). In this way, using neural networks, we would be able to find the relationship. However, the optical flow would depend on the distance of the camera from the pixel, which would cause problems. Is there any way to solve this problem?

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• Call a function by its name, given from string java

  - by Joao

  Hello, I would like to be able to call a function based on its name provided by a string. Something like public void callByName(String funcName){ this.(funcName)(); } I have searched a bit into lambda funcions but they are not supported. I was thinking about going for Reflection, but I am a bit new to programming, so I am not so familiar with the subject. This whole question was brought up on my java OOP class, when I started GUI (Swing, swt) programming, and events. I found that using object.addActionCommand() is very ugly, because I would later need to make a Switch and catch the exact command I wanted. I would rather do something like object.attachFunction(btn1_click), so that it would call the btn1_click function when the event click was raised. Thank you Joao

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• WPF Skin Skinning Security Concerns

  - by Erik Philips

  I'm really new to the WPF in the .Net Framework (get that out of the way). I'm writing an application where the interface is very customizable by simply loading .xaml (at the moment a Page element) files into a frame and then mapping the controls via names as needed. The idea is to have a community of people who are interested in making skins, skin my application however they want (much like Winamp). Now the question arises, due to my lack of Xaml knowledge, is it possible to create malicious Xaml pages that when downloaded and used could have other embedded Iframes or other elements that could have embed html or call remote webpages with malicious content? I believe this could be the case. If this is the case then I two options; either I have an automated process that can remove these types of Xaml files by checking it’s elements prior to allowing download (which I would assume would be most difficult) or have a human review them prior to download. Are there alternatives I’m unaware of that could make this whole process a lot easier?

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• Hibernate advanced select

  - by Marcus

  We want to get a row from a table using Hibernate a la: select max(id) from mytable where date = <date> Then select * from mytable where id = <max_id> We are currently using Hibernate to map mytable to Java domain objects. I know how to load the domain object based on an id. So I could just do #1 using JDBC and then load the domain object using Hibernate the "normal" way. But.. is there a way to do this with one single Hibernate logical query?

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• JPopupMenu returning a null?

  - by Zenzen

  Ok so I'm working on an Eclipse plugin based on the JGraph example. The problem is I can't really get the "save" method to work, here's how the program works in short: - I have a DiagramEditor class with an init() method, where I create a GraphEditor object and call the createFrame() methord of that object. - GraphEditor extends the BasicGraphEditor (which extends JPanel), the createFrame() method returns a JFrame and has a line "frame.setJMenuBar(menuBar)" - the "menuBar" is an object variable, which is initialized in the BasicGraphEditor. Till here everything is cool, the problem is with the action listener which is supposed to save a file. To get the graph I need to get the GraphEditor component, so I do a Component component = (Component) e.getSource() whitch is the ActionEvent passed to that action listener and at that stage is the JMenuItem "save", then I get the parent which is the JPopupMenu, then I want to get that JPopupMenu's parent which should be the GraphEdiotor, but instead I get a null. Any idea why? Here's some source code: DiagramEditor.java: @Override public void init(IEditorSite site, IEditorInput input) throws PartInitException { setSite(site); setInput(input); this.diagram = ((DiagramEditorInput)input).getDiagram(); setPartName(this.diagram.getName()); gEditor = new GraphEditor(); gEditor.createFrame().setVisible(true); } BasicGraphEditor.java: public JFrame createFrame() { JFrame frame = new JFrame(); frame.getContentPane().add(this); frame.setJMenuBar(menuBar); //frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(870, 640); return frame; } In the constructor: menuBar = new JMenuBar(); menu = new JMenu("File"); menu.setMnemonic(KeyEvent.VK_F); menuBar.add(menu); JMenuItem openMenuItem = new JMenuItem("Open", KeyEvent.VK_O); // ADD FILE OPENING //openMenuItem.addActionListener(menuListener); menu.add(openMenuItem); JMenuItem saveMenuItem = new JMenuItem("Save", new ImageIcon("/images/save.gif")); saveMenuItem.setMnemonic(KeyEvent.VK_S); saveMenuItem.addActionListener( new SaveAction(false) ); menu.add(saveMenuItem); // menu.add(new SaveAction(false)); JMenuItem saveMenuItemAs = new JMenuItem("SaveAs", new ImageIcon("/images/saveas.gif")); //saveMenuItemAs.setMnemonic(KeyEvent.VK_S); saveMenuItemAs.addActionListener( new SaveAction(true) ); menu.add(saveMenuItemAs); //menu.add(new SaveAction(true)); JMenuItem closeMenuItem = new JMenuItem("Close", KeyEvent.VK_C); closeMenuItem.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } } ); menu.add(closeMenuItem);

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• Updating List Elements, Haskell

  - by Tom

  I have homework where I am to update a list using a function that takes two elements and returns a value of part of the first element given in the function. So it's required to update the entire listing by going through each element and update its value by applying the function against all other elements in the list (including itself). So far I've been trying to firstly map the list (so that each element is done the same) and then specifically update each elements value by mapping again just the value of the specified element however in trying to map just the specific value through: the function, the specific element and the entire list I keep getting complaints that I'm inferring the list of values made from the 'map function p@list list' rather than simply giving the value at p@list. Is this the correct method to try to update a list against the entire list itself? EDIT: spelling mistakes and grammar

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• C# - Removing items from lists and all references to them.

  - by LiamV

  Hi there, I'm facing a situation where I have dependent objects and I would like to be able to remove an object and all references to it. Say I have an object structure like the code below, with a Branch type which references two Nodes. public class Node { // Has Some Data! } public class Branch { // Contains references to Nodes public Node NodeA public Node NodeB } public class Graph { public List<Node> Nodes; public List<Branch> Branches; } If I remove a Node from the Nodes list in the Graph class, it is still possible that one or more Branch objects still contains a reference to the removed Node, thus retaining it in memory, whereas really what I would quite like would be to set any references to the removed Node to null and let the garbage collection kick in. Other than enumerating through each Branch and checking each Node reference sequentially, are there any smart ideas on how I remove references to the Node in each Branch instance AND indeed any other class which reference the removed Node? Much appreciated, Liam

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• Problem using FluentNHibernate, SQLite and Enums

  - by weenet

  I have a Sharp Architecture based app using Fluent NHibernate with Automapping. I have the following Enum: public enum Topics { AdditionSubtraction = 1, MultiplicationDivision = 2, DecimalsFractions = 3 } and the following Class: public class Strategy : BaseEntity { public virtual string Name { get; set; } public virtual Topics Topic { get; set; } public virtual IList Items { get; set; } } If I create an instance of the class thusly: Strategy s = new Strategy { Name = "Test", Topic = Topics.AdditionSubtraction }; it Saves correctly (thanks to this mapping convention: public class EnumConvention : IPropertyConvention, IPropertyConventionAcceptance { public void Apply(FluentNHibernate.Conventions.Instances.IPropertyInstance instance) { instance.CustomType(instance.Property.PropertyType); } public void Accept(FluentNHibernate.Conventions.AcceptanceCriteria.IAcceptanceCriteria criteria) { criteria.Expect(x = x.Property.PropertyType.IsEnum); } } However, upon retrieval, I get an error regarding an attempt to convert Int64 to Topics. This works fine in SQL Server. Any ideas for a workaround? Thanks.

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• ASP.NET MVC Routes

  - by MVCDummy09

  Can I see one example that would make this piece of code compile? public IEnumerable<RouteBase> Routes { get { return new List<Route>() { new Route(...) } } } What would you do if RouteCollection.MapRoute() didn't exist? I'm trying to put my Controller in charge of mapping routes, not Global.asax.cs. public IEnumerable<RouteBase> Routes is a member of my Controller. If the Controller is responsible for a Route, it's a bad idea to decouple the Route by using routes.MapRoute() in Global.asax.cs.

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• System.Diaganostics.Process.Id Isn't the Same Process Id Shown in Task Manger. Why?

  - by LonnieBest

  I'm using c#'s System.Diagnostic.Process object. One of its properties is Id. The Id this produces is not the same as the PID, shown in Windows Task Manager. Why is this? You see, once this process is started. It launches two other unmanaged processes, for which I can't explicitly get IDs for by object property references. I have to search through all processes to find them by process name via System.Diagnostics.Process.GetProcesses(). I'm trying to find a reliable way to kill this process and all associated processes by PID, the one that shows in Task Manager. Is there a better way? I can't just kill all processes with the associated process names, because that might kill other instances of those processes that have nothing to do with my program.

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• How to decode a JSON String with several objects in PHP?

  - by ilnur777

  Hi, guys! I know how to decode a JSON string with one object with your help from this example http://stackoverflow.com/questions/2543389/how-to-decode-a-json-string But now I would like to improve decoding JSON string with several objects and I can't understand how to do it. Here is an example: { "programmers": [ { "firstName": "Brett", "lastName":"McLaughlin" }, { "firstName": "Jason", "lastName":"Hunter" }, { "firstName": "Elliotte", "lastName":"Harold" } ], "authors": [ { "firstName": "Isaac", "lastName": "Asimov" }, { "firstName": "Tad", "lastName": "Williams" }, { "firstName": "Frank", "lastName": "Peretti" } ], "musicians": [ { "firstName": "Eric", "lastName": "Clapton" }, { "firstName": "Sergei", "lastName": "Rachmaninoff" } ] } How to decode this JSON, call data and display on the page from what object the informartion list is being read? Thank you!

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• exception 'Zend_Controller_Action_Exception' with message 'Action "index" does not exist and was not

  - by princyp

  Anyone know what this error means? after googling I found a bunch of sites that appear to have the same error? thanks exception 'Zend_Controller_Action_Exception' with message 'Action "index" does not exist and was not trapped in __call()' in /usr/local/zend/apache2/htdocs/pintsy/lib/Zend/Controller/Action.php:485 Stack trace: #0 /usr/local/zend/apache2/htdocs/pintsy/lib/Zend/Controller/Action.php(515): Zend_Controller_Action->__call('indexAction', Array) #1 /usr/local/zend/apache2/htdocs/pintsy/lib/Zend/Controller/Dispatcher/Standard.php(289): Zend_Controller_Action->dispatch('indexAction') #2 /usr/local/zend/apache2/htdocs/pintsy/lib/Zend/Controller/Front.php(946): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http)) #3 /usr/local/zend/apache2/htdocs/pintsy/html/index.php(114): Zend_Controller_Front->dispatch() #4 {main}

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