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• Are @property's necessary for Interface Builder?

  - by Rits

  In my UIViewController subclass, I have 3 UIView's with each a @property as an IBOutlet. I do not use these properties at all in my code. The views get instantiated as soon as the view controller is created and they are deallocated when the view controller is deallocated. I was thinking; can't I just remove the @property's? I did, and I could still connect my instance variables (with IBOutlet) in Interface Builder. So my question now is; is there any use for properties in combination with Interface Builder, or is it OK to leave them out? Is it required for some memory management or something? Or are they really just for use in your own code? And if I do leave them out, do I still need to release them in dealloc?

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• iPhone - a question about @property

  - by Roger

  Hi, I am kind of newbie on Objective-C and I was looking at a code, trying to understand a few things, and I come across with this .h file: there was a declaration like that on the @interface section MyVideoClass *contrast_; then below we have @property (nonatomic, retain) MyVideoClass *contrast; @property (nonatomic, retain) FetchClass *fetchMe; The strange part is that the first has an underscrore after the name and the second one, doesn't. The other strange thing is that the guy has a call to these properties like this: FetchClass *fetchOne = [self.fetchMe contrast]; What kind of call is that? This seems pretty insane to me. I simply cannot understand what is going on here, but the code works. pretty insane. Can you guys explain me that? Forgive the stupid question, but I am still learning... thanks

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• Sort List by occurrence of a word by LINQ C#

  - by Thomas

  i have stored data in list like List<SearchResult> list = new List<SearchResult>(); SearchResult sr = new SearchResult(); sr.Description = "sample description"; list.Add(sr); suppose my data is stored in description field like "JCB Excavator - ECU P/N: 728/35700" "Geo Prism 1995 - ABS #16213899" "Geo Prism 1995 - ABS #16213899" "Geo Prism 1995 - ABS #16213899" "Wie man BBA reman erreicht" "this test JCB" "Ersatz Airbags, Gurtstrammer und Auto Körper Teile" now i want to query the list with my search term like geo jcb if you look then the word geo has stored many times in the description field. so i want to sort my list in such way that the word in search term found maximum that data will come first. please help me to do so. thanks

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• Problem in List<double[,]>

  - by Newbie

  What is wrong with this (in C# 3.0): List<double> x = new List<double> { 0.0330, -0.6463, 0.1226, -0.3304, 0.4764, -0.4159, 0.4209, -0.4070, -0.2090, -0.2718, -0.2240, -0.1275, -0.0810, 0.0349, -0.5067, 0.0094, -0.4404, -0.1212 }; List<double> y = new List<double> { 0.4807, -3.7070, -4.5582, -11.2126, -0.7733, 3.7269, 2.7672, 8.3333, 4.7023,0,0,0,0,0,0,0,0,0 }; List<double[,]> z = new List<double[,]>{x,y}; // this line The error produced is: Error: Argument '1': cannot convert from 'System.Collections.Generic.List<double>' to 'double[*,*]' Help needed.

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• Property Scope (Iphone)

  - by Hank

  Hello All. I am having trouble accessing a declared property and I think I am missing something fundamental about the nature of properties and perhaps view controllers. Here's what I'm doing so far: declaring a property "myPhone" in a root view controller called RootViewController. grabbing a phone number from a modally presented people picker setting "myPhone" to the value from the people picker (from within shouldContinueAfterSelectingPerson of ABPeoplePickerNavigationController) trying to access "myPhone" from another modally presented view controller "myPhone" continues to NSLog to null despite trying every permutation of self.myPhone, super, RootViewController, etc. to try and access the value I set. What am I missing?

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• Benefits of arrays

  - by Vitalii Fedorenko

  As I see it, the advantages of List over array are pretty obvious: Generics provide more precise typing: List<Integer>, List<? extends Number>, List<? super Integer>. List interface has a bunch useful methods: addAll, remove etc. While for arrays all standard operations except get/set must be performed in a procedure manner by passing it to a static method. Collections offer different implementations like ArrayList, LinkedList, unmodifieable and synchronized lists, which can be hidden under common List interface. OOB length control. As disadvantages I can only mention absence of syntactic sugar and runtime type check. At the same time supporting of both structures requires frequent using of asList and toArray methods, which makes code less readable. So I am curious if there are any important benefits of using arrays that I miss.

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• Use SQL query to populate property in nHibernate mapping file

  - by brainimus

  I have an object which contains a property that is the result of an SQL statement. How do I add the SQL statement to my nHibernate mapping file? Example Object: public class Library{ public int BookCount { get; set; } } Example Mapping File: <hibernate-mapping> <class name="Library" table="Libraries"> <property name="BookCount" type="int"> <- This is where I want the SQL query to populate the value. -> </class> </hibernate-mapping> Example SQL Query: SELECT COUNT(*) FROM BOOKS WHERE BOOKS.LIBRARY_ID = LIBRARIES.ID

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• C# style properties in python

  - by 3D-Grabber

  I am looking for a way to define properties in Python similar to C#, with nested get/set definitions. This is how far I got: #### definition #### def Prop(fcn): f = fcn() return property(f['get'], f['set']) #### test #### class Example(object): @Prop def myattr(): def get(self): return self._value def set(self, value): self._value = value return locals() # <- how to get rid of this? e = Example() e.myattr = 'somevalue' print e.myattr The problem with this is, that it still needs the definition to 'return locals()'. Is there a way to get rid of it? Maybe with a nested decorator?

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• Drools rule to filter element with a numeric property below a percentage of the total

  - by Mario

  Hello, I have just started using Drools on a small project and now I need to write a rule a bit complex and I don't really know what's the best way to do it. I am applying this rule to a list of objects of the same type (this class have a property called numberOfExecutions). I need to check for each element of the list if the numberOfExecutions of that element is bigger than 5% of the total numberOfExecutions (the sum of numberOfExecutions of all the elements in the list). I could not think of a nice way to implement this in drools so far, do you have a suggestion?

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• Cannot bind to list<T>.property or list<T>.item.property in details section of Telerik report

  - by fluf

  I have created a Telerik report and I am setting the datasource on runtime to an object with some properties and a List. I am using the properties in the page and report header sections and i want to use the list as the details. Now the problem is binding to the List's item properties in the details section. I have played around with the expression builder and it seems that i should access the properties like this : [=Fields.myList.Item.myProperty] when i run the program i get a nice big red rectangle with the following error : An error has occured while processing TextBox 'textBox28':Common Language Runtime detected an invalid program. I have tried to change different variants of expression which also gives me other errors [=Fields.myList.myPropery] An error has occured while processing TextBox 'textBox28': The expression contains object 'myProperty' that is not defined in the current context. The closest i have gotton was with the object it self, which outputs the object.toString() [=Fields.myList]

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• How to expose a control collection to a property grid at design time

  - by Stefano Delendati

  I have a custom control that with a property that is a collection of custom object. This custom object hava a reference to some component/controls. When at design time I tray to add an item to the collection and select the object, VS tells me that the control is not serializable. This is the code (simplified version - but not to much): public class ViewRefObj { public control view { get; set; } public ViewRefObj() { } } private List<ViewRefObj> _controls=new List<ViewRefObj>(); public List<ViewRefObj> Views { get { return _controls; } }

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• Best naming for a property in C#?

  - by Lance Fisher

  Which of the following three options would you choose for a property name in C#, and why? YearToDateWages YTDWages YtdWages

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• rspec mocking object property assignment

  - by charlielee

  I have a rspec mocked object, a value is assign to is property. I am struggleing to have that expectation met in my rspec test. Just wondering what the sytax is? The code: def create @new_campaign = AdCampaign.new(params[:new_campaign]) @new_campaign.creationDate = "#{Time.now.year}/#{Time.now.mon}/#{Time.now.day}" if @new_campaign.save flash[:status] = "Success" else flash[:status] = "Failed" end end The test it "should able to create new campaign when form is submitted" do campaign_model = mock_model(AdCampaign) AdCampaign.should_receive(:new).with(params[:new_campaign]).and_return(campaign_model) campaign_model.should_receive(:creationDate).with("#{Time.now.year}/#{Time.now.mon}/#{Time.now.day}")campaign_model.should_receive(:save).and_return(true) post :create flash[:status].should == 'Success' response.should render_template('create') end The problem is I am getting this error: Spec::Mocks::MockExpectationError in 'CampaignController new campaigns should able to create new campaign when form is submitted' Mock "AdCampaign_1002" received unexpected message :creationDate= with ("2010/5/7") So how do i set a expectation for object property assignment? Thanks

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• trying to get property of non object curl issue

  - by user550265

  I have a curl setup as follows to access a json object $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "http://sitename.com"); curl_setopt($ch, CURLOPT_HEADER, 0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_BINARYTRANSFER, true); curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookiefilename.txt'); curl_setopt($ch, CURLOPT_HTTPHEADER, array('Host:sitename.com')); $output = curl_exec($ch); curl_close($ch); $output = json_decode($output); echo $output->property; I get the error 'trying to access property of non object'.

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• wrong data type in mysql for grails byte[] property

  - by srkiNZ84

  Hi, I have an application which is trying to save a photo to the database. I've created a grails domain class with a byte[] property and this was working well when using HSQLDB (the default in grails). However, when I changed the database to MySQL I ended up getting the following error: Data truncation: Data too long for column 'photo' at row 1 I then had a look at the schema and found that the byte[] was being created as a TINYBLOB field, which was causing the error. How can I specify that this property should correspond to a BLOB/LONGBLOB type in the database?

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• Attach to Property's setter

  - by StupidDeveloper

  I haven't found similiar post so I'm asking this. Let's say I defined somewhere an application wide available static Property (I mean it's not local) and in one class I would like to know when this property is being changed. Apart from aop (transparentproxy etc.) which I think doesn't suit me well here (and I can't add that to project anyway), what are the options here? One solution I can think of, which is probably a very nasty one, is to use some event that would be executed in the setter and just attach it in the class(es) which needs that. Something like: public static event EventHandler CurrentNumberChanged= delegate {}; public static int CurrentNumber { get { return currentNumber; } set { currentNumber = value; CurrentNumberChanged(null, EventArgs.Empty); } } I know it's really unsafe to use such events ( read here ). And since I would use it in asp.net makes it even more ugly. Do you have any advices ?

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• CSS- removing horizontal space in list menu using display inline property

  - by Kayote

  Hi All, Im new to CSS and have a set target of learning & publishing my website in CSS by the end of the month. My question: Im trying to build a CSS horizontal menu with hover drop downs, however, when I use the 'display: inline' property with li (list) items, I get horizontal spaces between the li (list) items in the bar. How do I remove this space? Here is the html: <div id="tabas_menu"> <ul> <li id="tabBut0" class="tabBut">Overview</li> <li id="tabBut1" class="tabBut">Collar</li> <li id="tabBut2" class="tabBut">Sleeves</li> <li id="tabBut3" class="tabBut">Body</li> </ul> </div> And here is the CSS: #tabas_menu { position: absolute; background: rgb(123,345,567); top: 110px; left: 200px; } ul#tabas_menu { padding: 0; margin: 0; } .tabBut { display: inline; white-space: list-style: none; background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(rgba(255,142,190,1)),to(rgba(188,22,93,1))); background: -moz-linear-gradient(top, rgba(255,142,190,1), rgba(188,22,93,1)); font-family: helvetica, calibri, sans-serif; font-size: 16px; font-weight: bold; line-height: 20px; text-shadow: 1px 1px 1px rgba(99,99,99,0.5); -moz-border-radius: 0.3em; -moz-box-shadow: 0px 0px 2px rgba(0,0,0,0.5); -webkit-border-radius: 0.3em; -webkit-box-shadow: 0px 0px 2px rgba(0,0,0,0.5); padding: 6px 18px; border: 1px solid rgba(0,0,0,0.4); margin: 0; } I can get the space removed using the 'float: left/right' property but its bugging me as to why I cannot achieve the same effect by just using the display property.

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• c++ property class structure

  - by Without me Its just Aweso

  I have a c++ project being developed in QT. The problem I'm running in to is I am wanting to have a single base class that all my property classes inherit from so that I can store them all together. Right now I have: class AbstractProperty { public: AbstractProperty(QString propertyName); virtual QString toString() const = 0; virtual QString getName() = 0; virtual void fromString(QString str) = 0; virtual int toInteger() = 0; virtual bool operator==(const AbstractProperty &rightHand) = 0; virtual bool operator!=(const AbstractProperty &rightHand) = 0; virtual bool operator<(const AbstractProperty &rightHand) = 0; virtual bool operator>(const AbstractProperty &rightHand) = 0; virtual bool operator>=(const AbstractProperty &rightHand) = 0; virtual bool operator<=(const AbstractProperty &rightHand) = 0; protected: QString name; }; then I am implementing classes such as PropertyFloat and PropertyString and providing implementation for the comparator operators based on the assumption that only strings are being compared with strings and so on. However the problem with this is there would be no compiletime error thrown if i did if(propertyfloat a < propertystring b) however my implementation of the operators for each derived class relies on them both being the same derived class. So my problem is I cant figure out how to implement a property structure so that I can have them all inherit from some base type but code like what I have above would throw a compile time error. Any ideas on how this can be done? For those familiar with QT I tried using also a implementation with QVariant however QVariant doesn't have operators < and defined in itself only in some of its derived classes so it didn't work out. What my end goal is, is to be able to generically refer to properties. I have an element class that holds a hashmap of properties with string 'name' as key and the AbstractProperty as value. I want to be able to generically operate on the properties. i.e. if I want to get the max and min values of a property given its string name I have methods that are completely generic that will pull out the associated AbstactProperty from each element and find the max/min no matter what the type is. so properties although initially declared as PropertyFloat/PropertyString they will be held generically.

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• How to make TObjectDictionary.Values accessible as property?

  - by Holgerwa

  I have an object like this: TMyObj = class private FObjList: TObjectDictionary <integer, TMyObject>; public constructor Create; destructor Destroy; // How to access Values correctly? Something similar to this not working code property Values: TValueCollection read FObjList.Values write FObjList.Values; end; var MyObj: TMyObj; To access the values of FObjList, I'd like to write: for tmpObject in MyObj.Values do ... How do I need to declare the property "Values" so that MyObj.Values behaves exactly as if I would access MyObj.FObjList.Values?

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• ASP webservice serialization of properties

  - by badra

  I got a class like this which gets returned from an ASP webservice: class Data { public int A { get; set; } public int B { get; set; } public int Sum { get { return A + B; } } } When I try to consume the webservice on the client side using Silverlight I only get the properties A and B but I also need Sum. I know I can't return any logic from a webservice, so the expected behavior was it will return the the Sum as a fixed/precalculated property in the client which is what I need. Any ideas except for redesigning my class? Thanks ...

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• Crash when checking BOF property of pessimistic locked ADO recordset

  - by Patrick

  Bit of an odd one for you: I've got two connections to a database, on one I've opened a _RecordsetPtr with a pessimistic lock. I can no longer send an UPDATE command on the other connection. I can send a SELECT command on the second connection and data is returned. If I use a read only lock then there are no problems however when I use a pessimistic lock on the second connection as well I can check the State == adStateOpen but the program hangs when I test the BOF property! If I don't test the BOF property and try to call moveNext on the second connection the software hangs If I do neither of these I am able to access the data via the second connection but trying to access the data from the first connection causes the software to hang. Any one seen anything similar as I'm a bit stuck? EDIT : it wasn't hanging, someone had put a 30 minute timeout on the connection and I wasn't waiting that long while testing...

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• PHP: Accessing an object property with a variable.

  - by Peter

  Let's assume I have an array of object properties I'd like to access: $properties = array('foo', 'bar'); I'd like to loop through the object and access these properties dynamically (specifically, I'm trying to dynamically handle missing JSON elements based on an array of expected elements): foreach ($data as $item) { foreach ($properties as $property) { if (empty($item->{$property})) { // Do something } } } Each $item in $data should have the properties 'foo' and 'bar'. If empty(), I'll handle them. I'm trying to get the loop (in line 3) to access $item-{'foo'} and $item-{'bar'}, but it's not working. Any idea why? Thanks!

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• IE7 and the CSS table-cell property

  - by Ryan Smith

  So I just love it when my application is working great in Firefox, but then I open it in IE and... Nope, please try again. The issue I'm having is that I'm setting a CSS display property to either "none" or "table-cell" with JavaScript. I was initially using "display: block;", but Firefox was rending it weird without the table-cell property. I would love to do this without adding an hack in the JavaScript to test for IE. Any suggestions? Thanks.

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• Dynamically udpate canvasOverlay property of jQuery jqPlot

  - by You Kuper

  I want to dynamically udpate canvasOverlay property of jQuery jqPlot. This will provide the effect of a timeline in my jqPlot. This effect should be similar to the one shown in this jFiddle. However, instead of drawing points, I want to update canvasOverlay property every second: canvasOverlay: { show: true, objects: [ { rectangle: { xmax: new Date(), xminOffset: "0px", xmaxOffset: "0px", yminOffset: "0px", ymaxOffset: "0px", color: "rgba(0, 0, 0, 0.1)", showTooltip: true } }, ] } How can I do this? What are the functions I should use? UPDATE: My idea is to do something like this: canvasOverlay: { name: 'current', show: true, objects: [ { rectangle: { xmax: new Date(), xminOffset: "0px", xmaxOffset: "0px", yminOffset: "0px", ymaxOffset: "0px", color: "rgba(0, 0, 0, 0.1)", showTooltip: true } }, ] } /... var co = plot.plugins.canvasOverlay; var current = co.get('current'); current.options.objects.rectangle.xmax = new Date(); co.draw(plot);

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• ASP.NET Custom Control With A Property That Is An Interface

  - by user129674

  I want to have a property on my custom control that is an interface type. For example: [ ToolboxData("<{0}:MyTextBox runat=server></{0}:MyTextBox"), ParseChildren(true, "Validation") ] class MyTextBox : WebControl { [ Category("Behavior"), Description("The validation to use"), DesignerSerializationVisibility(DesignerSerializationVisibility.Content), PersistenceMode(PersistenceMode.InnerDefaultProperty) ] public IValidation Validation { get; set; } } Then when I go to use my control in a web form I would like to be able to do: <my:MyTextBox ID="txt" runat="server"> <my:FancyValidator /> </my:MyTextBox> That way I will be able to define one class that could use any number of validators. When I try and do this now, I end up with an error saying: Type 'IValidator' does not have a public property named 'FancyValidator' What do I need to do to make this work? Thanks!

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