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• Is it safe to override `release` for debugging?

  - by Koning Baard XIV

  Sometimes I need to find out if an object will really be released. I could use Instruments of course, but that takes much time, and I have to search into millions of objects, so I used to do this: -(void)release { NSLog("I'm released"); [super release]; } But the problem is: is this safe to do? Can I get any problems when I override -(void)release. Also, is it really void? And what if I build my application for distribution, but per accident leave it there? Or is it just safe? Thanks

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• Implicitly invoking parent class initializer

  - by Matt Joiner

  class A(object): def __init__(self, a, b, c): #super(A, self).__init__() super(self.__class__, self).__init__() class B(A): def __init__(self, b, c): print super(B, self) print super(self.__class__, self) #super(B, self).__init__(1, b, c) super(self.__class__, self).__init__(1, b, c) class C(B): def __init__(self, c): #super(C, self).__init__(2, c) super(self.__class__, self).__init__(2, c) C(3) In the above code, the commented out __init__ calls appear to the be the commonly accepted "smart" way to do super class initialization. However in the event that the class hierarchy is likely to change, I have been using the uncommented form, until recently. It appears that in the call to the super constructor for B in the above hierarchy, that B.__init__ is called again, self.__class__ is actually C, not B as I had always assumed. Is there some way in Python-2.x that I can overcome this, and maintain proper MRO when calling super constructors without actually naming the current class?

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• Overloading properties in C#

  - by end-user

  Ok, I know that property overloading is not supported in C# - most of the references explain it by citing the single-method-different-returntype problem. However, what about setters? I'd like to directly assign a value as either a string or object, but only return as a string. Like this: public string FieldIdList { get { return fieldIdList.ToString(); } set { fieldIdList = new FieldIdList(value); } } public FieldIdList FieldIdList { set { fieldIdList = value; } } private FieldIdList fieldIdList; Why wouldn't this be allowed? I've also seen that "properties" simply create getter/setter functions on compile. Would it be possible to create my own? Something like: public void set_FieldIdList(FieldIdList value) { fieldIdList = value; } That would do the same thing. Thoughts?

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• In Ruby are there any related applications of the syntax: class << self ... end

  - by pez_dispenser

  class << self attr_accessor :n, :totalX, :totalY end The syntax above is used for defining class instance variables. But when I think about what syntax implies, it doesn't make any sense to me, so I'm wondering if this type of syntax is used for any other types of definitions. My point of confusion here is this: class << self The append operator normally means "add what's on the right to the object on the left". But in the context of this block, how does that add up to "put the contents of this block into the definition of the class instance rather than the instance"? For the same reason I'm confused as to why in one context class << self can define class instance variables while in another it seems to create class variables such as here: class Point # Instance methods go here class << self # Class methods go here end end

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• need thoughts on my interview question - .net, c#

  - by uno

  One of the questions I was asked was that I have a database table with following columns pid - unique identifier orderid - varchar(20) documentid - int documentpath - varchar(250) currentLocation - varchar(250) newlocation - varchar(250) status - varchar(15) I have to write a c# app to move the files from currentlocation to newlocation and update status column as either 'SUCCESS' or 'FAILURE'. This was my answer Create a List of all the records using linq Create a command object which would be perform moving files using foreach, invoke a delegate to move the files - use endinvoke to capture any exception and update the db accordingly I was told that command pattern and delegate did not fit the bill here - i was aksed to think and implement a more favorable GoF pattern. Not sure what they were looking for - In this day and age, do candidates keep a lot of info on head as one always has google to find any answer and come up with solution.

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• How to retain service settings through InstallShield upgrade install

  - by sjohnston

  I have an InstallScript project in IS2010. It has a handful of services that get installed. Some are C++ exes and use the "InstallShield Object for NT Services". Others are Java apps installed as services with Java Service Wrapper through LaunchAppAndWait command line calls. Tomcat is also being installed as a service through a call to its service.bat. When the installer runs in upgrade mode, the services are reinstalled, and the settings (auto vs. manual startup, restart on fail, log-on account, etc.) are reverted to the defaults. I would like to save the service settings before the file transfer and then repopulate them afterward, but I haven't been able to find a good mechanism to do this. How can I save and restore the service settings?

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• Address calling class [Java]

  - by Samuel

  Hello! [I am rather new to Java and Object Oriented programming] I have an abstract class Moveable with the method abstract void move() which is extended by the class Bullet and the abstract class Character, and Character is extended by the class Survivor and the class Zombie. In Survivor and Bullet the move() method doesnt require any parameters while in the class Zombie the move() method depends on the actual position of the survivor. The survivor and multiple zombies are created in the class Gui. I wanted to access the survivor in Zombie - what's the best way of doing this? In Gui i wrote a method getSurvivor() but i don't see how to access this method in Zombie? I am aware that as a workaround i could just pass a [Survivor survivor] as parameter in move() and ignore it in Bullet and Survivor, but that feels so ... bad practice. Thank you for your time! Samuel [I am not sure what tags to set here, please correct me if i'm wrong]

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• When to use AsyncOperation and AsyncOperationManager

  - by Sir Psycho

  Hi, I've spent many many hours tonight reading up on implementing the event-based asynchronous pattern Unfortunately, I haven't been able to find any articles at all on witting a class that only supports one Async invocation. Every example I've seen assumes that a method call will be called more than once and thus, should have a userState object passed into the MethodNameAsync You'll see that MS makes mention of this in the third bullet point on this article http://msdn.microsoft.com/en-us/library/ms228974(VS.80).aspx under the "Simultaneously Executing Operations" heading. But I'm confused. Should I be using AsyncOperation and AsyncOperationManager classes to have asynchronous functionality where a method can only be called by one thread at a time? A link would also be nice :) Thanks

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• How to use CFUUID, can CFUUID be traced back to a unique individual. security/privacy

  - by Kevin

  Hi, i an new to iphone Dev and the concept of CFUUID, so thought i should ask, before i start implementing it. so the string returned by CFUUID is it really unique or can it be traced back to a unique individual. meaning lets say, i generate a CFUUID object and convert it to string(using the methods provided) , and then this info is used in my app or stored on a server database. and how unique is it, i mean is their a chance it can be similar to one generated on some other device. is it a good idea to use this info freely or are their some security/privacy aspects that i am not thinking about here. any help is greatly appreciated thanks

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• NHibernate: Many-to-many relationship with field in the relationship table

  - by Fossmo

  I'm scratching my head; I have a Car table and a Customer table that have a many-to-many relationship. In this relationship table I want to add a column that can tell me what kind of relationship this is; is the customer testdriving the car, do he want to buy the car, ect. What I want to end up with is a class Car object that holds a collection of Customers and the relationship information. I might be looking at this the wrong way so feel free to push me in the right direction.

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• Tuning OS X Virtual Memory

  - by dcolish

  I've noticed some really odd results form vm_stat on OSX 10.6. According to this, its barely hitting the cache. Searches of pretty much everywhere I could think of turn up little to explain why the rate is so low. I asked a few friends and they're seeing the same thing. What gives and how can I make it better? Mach Virtual Memory Statistics: (page size of 4096 bytes) Pages free: 78609. Pages active: 553411. Pages inactive: 191116. Pages speculative: 6198. Pages wired down: 153998. "Translation faults": 116031508. Pages copy-on-write: 2274338. Pages zero filled: 33360804. Pages reactivated: 264378. Pageins: 1197683. Pageouts: 43756. Object cache: 20 hits of 1550639 lookups (0% hit rate)

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• Error calling webservice using JSONP + jquery with IE on remote domain

  - by Jay Heavner

  I have a .Net webservice on my app server that returns data formatted as JSONP. I have an HTML test client on that server which works fine using IE, Firefox, & Chrome. If I copy the same HTML to my workstation or deploy to my webserver it works with Firefox & Chrome but in IE I'm getting two javascript errors. Message: Object doesn't support this property or method Line: 1 Char: 1 Code: 0 URI: http://mydomain/WebServices/LyrisProxy/Services/Lyris/JSONP/Lyris.asmx/AddUser?lyrisInstance="1"&email="[email protected]"&fullName="My Name"&lyrisList="listname"&format=json&callback=jsonp1274109819864&_=1274109829665 Message: Member not found. Line: 59 Char: 209 Code: 0 URI: http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js I'm kind of at loss as to what to do to fix this.

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• Entity Framework and the XmlIgnoreAttribute

  - by Mikey Cee

  Say you have a one to one relationship in your entity model. The code generator will decorate it with the following attributes: [global::System.Xml.Serialization.XmlIgnoreAttribute()] [global::System.Xml.Serialization.SoapIgnoreAttribute()] public RelatedObject Relationship { get {...} set {...} } I want to serialize my parent object together with all its properties for which data has been loaded through an XML web service. Obviously, these related properties do not get serialized because of these attributes. So for my purposes I just want to remove these "don't serialize me" attributes. I can do a find and replace in the designer code, but any modifications I make in the designer will put these attributes back in. How do I permanently get rid of these attributes? VS 2008 / EF 3.5.

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• MKMapView not centered on pin

  - by Val Smith

  Hi all, I have an mkmapview that i'm currently adding pins to, but for some reason when I call [mapView setRegion:[detailItem coordinateRegion] animated:YES]; the pin is off-centered (toward the right side of the screen) on the map. Here is the code for [deailItem coordinateRegion]: - (MKCoordinateRegion)coordinateRegion { MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } }; region.center = self.coordinate; region.span.longitudeDelta = 0.0075f; region.span.latitudeDelta = 0.0075f; return (region); } I'm setting the coordinateRegion's center to the object's x,y coordinate, so why is it off-center on the map? I feel like there's something I'm missing here... ::Val::

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• After playing a MediaElement, how can I play it again?

  - by Edward Tanguay

  I have a variable MediaElement variable named TestAudio in my Silverlight app. When I click the button, it plays the audio correctly. But when I click the button again, it does not play the audio. How can I make the MediaElement play a second time? None of the tries below to put position back to 0 worked: private void Button_Click_PlayTest(object sender, RoutedEventArgs e) { //TestAudio.Position = new TimeSpan(0, 0, 0); //TestAudio.Position = TestAudio.Position.Add(new TimeSpan(0, 0, 0)); //TestAudio.Position = new TimeSpan(0, 0, 0, 0, 0); //TestAudio.Position = TimeSpan.Zero; TestAudio.Play(); }

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• populate a comboBox in Griffon App dynamically

  - by kulkarni

  I have 2 comboBoxes in my View of Griffon App (or groovy swingBuilder) country = comboBox(items:country(), selectedItem: bind(target:model, 'country', value:model.country), actionPerformed: controller.getStates) state = comboBox(items:bind(source:model, sourceProperty:'states'), selectedItem: bind(target:model, 'state', value:model.state)) The getStates() in the controller, populates @Bindable List states = [] in the model based on the country selected. The above code doesn't give any errors, but the states are never populated. I changed the states from being List to a range object(dummy), it gives me an error MissingPropertyException No such property items for class java.swing.JComboBox. Am I missing something here? There are a couple of entries related to this on Nabble but nothing is clear. The above code works if I had a label instead of a second comboBox.

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• Linq to Sql saying that item by 'Customer' already exists. Choose a different name.

  - by Anthony Potts

  I have been going round and round with a linq to sql file while using svn for quite some time. The latest is that my dbml file shows as having an error which states that An item named "Customer" already exists. Please choose a different name. And then it repeats that again. In fact, it says it for almost every object. What is my fix? I have tried renaming the one named Customer, but that didn't fix it. I don't know where to go to fix this. I went to the .dbml file and don't see any duplication, and I went to the .dbml.layout file and didn't see any duplication there either.

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• How to be sure that my MVC project is runting on the correct version after upgrade to vs2010?

  - by Stephane

  I just installed visual studio 2010 and upgraded my MVC project (which was running on MVC RC2 in visual studio 2008). visual studio 2010 updated every project file to target the framework 4.0. But the system.web.dll is pointing to C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 2\Assemblies\System.Web.Mvc.dll in VS2010 object browser, I have every dll showing up in multiple versions as expected (3.5.0.0 and 4.0.0.0) except for the System.Web.Mvc dll which doesn't show any version and points to the path I mentioned above. Isn't this namespace point to the Framework folder like the System.Web namespace? C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Web.dll

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• Overriding classes/functions from a .dll.

  - by Jeff

  Say I have class A and class B. B inherits from class A, and implements a few virtual functions. The only problem is that B is defined in a .dll. Right now, I have a function that returns an instance of class A, but it retrieves that from a static function in the .dll that returns an instance of class B. My plan is to call the created object, and hopefully, have the functions in the .dll executed instead of the functions defined in class A. For some reason, I keep getting restricted memory access errors. Is there something I don't understand that will keep this plan from working?

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• Using 2 JQuery Autocomplete

  - by Trike

  Hi All! I am using the JQuery Autocomplete Plugin 1.1. When I try to add autocomplete to 2 inputs in this way: $("#object_ac").autocomplete("autocomplete_search.php", { extraParams: {object:1}, width: 160, selectFirst: false, minChars: 2 }); $("#id_norm_doc_ac").autocomplete("autocomplete_search.php", { width: 460, selectFirst: false, mustMatch: true }); $("#id_norm_doc_ac").result(function(event, data, formatted) { $("#id_norm_doc_add").val(data[1]); }); When #object_ac selected before #id_norm_doc_ac I get error after selecting one of suggestions in #id_norm_doc_ac: data is undefined [Break on this error] data = elementToString(data.documentElement, true); If I select #id_norm_doc_ac before other inputs, everything goes normal. Thanks in advance for any assistance!

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• Proper way to copy a readonly NSMutableArray

  - by Jon Hull

  I have an object with a readonly property that I am trying to implement NSCopying for. It has a mutableArray called "subConditions" (which holds "SubCondition" objects). I have made it readonly because I want callers to be able to change the data in the array, but not the array itself. This worked really well until it was time to write the -copyWithZone: method. After fumbling around a bit, I managed to get something that seems to work. I am not sure if it is the best practice though. Here is a simplified version of my -copyWithZone: method: -(id)copyWithZone:(NSZone*)zone { Condition *copy = [[[self class]allocWithZone:zone]init]; NSArray *copiedArray = [[NSArray alloc]initWithArray:self.subConditions copyItems:YES]; [copy.subConditions setArray:copiedArray]; [copiedArray release]; return copy; } Is this the correct/best way to copy a readonly mutableArray?

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• How to make a post request with REQUESTS package for Python?

  - by jorrebor

  I am trying to use the toggl api. I use Requests instead of Urllib2 for doing my GETs en POSTS. But i am stuck. payload = { "project":{ "name":"Another Project", "billable":False, "workspace":{ "Name":"jorrebor's workspace", "id":213272 }, "automatically_calculate_estimated_workhours":False } } url = "https://www.toggl.com/api/v6/projects.json" r = requests.post(url, data=json.dumps(payload), auth=HTTPBasicAuth('[email protected]', 'mypassword')) Authentication seems to be fine, but the payload format probably isn't. a curl command with the same parameters: curl -v -u heremytoken:api_token -H "Content-type: application/json" -d "{\"project\":{\"billable\":true,\"workspace\":{\"id\":213272},\"name\":\"Another project\",\"automatically_calculate_estimated_workhours\":false}}" -X POST https://www.toggl.com/api/v6/projects.json does work fine. What wrong with my payload? The response is get is: ["Name can't be blank","Workspace can't be blank"] which leads me to conclude that the authentication works but toggl cannot read my json object.

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• Activator.CreateInstance(Type) for a type without parameterless constructor

  - by Seb

  Reading existing code at work, I wondered how come this could work. I have a class defined in an assembly : [Serializable] public class A { private readonly string _name; private A(string name) { _name = name; } } And in another assembly : public void f(Type t) { object o = Activator.CreateInstance(t); } and that simple call f(typeof(A)) I expected an exception about the lack of a parameterless constructor because AFAIK, if a ctor is declared, the compiler isn't supposed to generate the default public parameterless constructor. This code runs under .NET 2.0.

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• Does C# have an equivalent to Scala's structural typing?

  - by Tom Morris

  In Scala, I can define structural types as follows: type Pressable { def press(): Unit } This means that I can define a function or method which takes as an argument something that is Pressable, like this: def foo(i: Pressable) { // etc. The object which I pass to this function must have defined for it a method called press() that matches the type signature defined in the type - takes no arguments, returns Unit (Scala's version of void). I can even use the structural type inline: def foo(i: { def press(): Unit }) { // etc. It basically allows the programmer to have all the benefits of duck typing while still having the benefit of compile-time type checking. Does C# have something similar? I've Googled but can't find anything, but I'm not familiar with C# in any depth. If there aren't, are there any plans to add this?

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• Detecting rotation to landscape manually

  - by Thomas Joos

  hi all, I am working on an iPhone application based on UITabBarController and UIViewControllers for each page. The app needs to run in portrait mode only, so every view controller + app delegate goes with this line of code: (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } There is one view controller where I would like to pop up a UIImageView when the iPhone is rotaed to landscapeleft. The design of the image looks landscape, although the width and height are 320x460 ( so its portrait ). How can/should I detect this type of rotation manually, just in this specific view controller, withouth having an auto rotation on the entire view? Thomas UPDATE: Thanks! I added this listener in the viewDidLoad: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:)name:UIDeviceOrientationDidChangeNotification object:nil]; the didRotate looks like this: (void) didRotate:(NSNotification *)notification { UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; if (orientation == UIDeviceOrientationLandscapeLeft) { //your code here } }

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