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• Problem in the Android documentation

  - by Nick

  Hi all, This is my first post ever -- I love the Android SDK (been at it for a week), but I did notice a small typo in the official documentation that needs correcting. Not sure if this is where I post it, but on this page: http://developer.android.com/reference/android/os/CountDownTimer.html within the example source code, the source says "CountdownTimer" on line one when it should say "CountDownTimer" (notice the capitalization of the letter "D"). An easy fix for one with programming experience, but the code as written will not compile, which could be confusing for someone using this code for the first time. Is this where documentation bugs are submitted, and if not, where should I go to request the fix? Thanks all!

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• Which class will be instanciated

  - by Michael

  Say I have 2 subclasses from UIViewController, class A and class B. In Main nib file an object is representing class A and it is set to load file from Secondary nib file. The owner of Secondary nib is of class B. The question is - from which class an object in Main nib file will be instanciated once the nib files unarchived in the memory? The reason this question arised is that I have to take care myself if such reference to external NIB file present, to ensure that the first nib's object and second nib's owner is same. Please correct me if my statement is wrong.

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• Why does my WCF service return and ARRAY instead of a List <T> ?

  - by user193189

  In the web servce I say public List<Customer> GetCustomers() { PR1Entities dc = new PR1Entities(); var q = (from x in dc.Customers select x).ToList(); return q; } (customer is a entity object) Then I generate the proxy when I add the service.. and in the reference.cd it say public wcf1.ServiceReference1.Customer[] GetCustomers() { return base.Channel.GetCustomers(); } WHY IS IT AN ARRAY? I asked for a List. help.

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• JQuery Slider, Need to Create a Slider with range as Current Date - 3 Months...

  - by Cozmoz

  I am new to Jquery but my task is to create a Slider in Jquery, which will have a range as Current Date to (Last 3 Months Date). Slider --------------------------------------------------------------------- (Below is Just a Reference, the Slider should have a callout box or an area to show the Current Date which is selected) 1-----------------31 | 1---------28 | 1---------30 | 1------Curr Date Jan Feb Mar Apr Also the Data should change according to the range selected. If anyone who has come across any such problem/solution please let me know, I would be more than grateful to him/her. Thanks!

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• IE7 preventDefault() not working on skip links

  - by josh

  I currently have skip links that jump to the div ids and was using e.preventDefault() to stop the url from changing when jumping to the element but in IE7 and IE8 it doesn't work at all using e.preventDefault() and if I take it out the url changes to the div the anchor tag contains reference to. Is their any fix or way around this? Here is the code $('body').delegate('a.skiplink-accessible-text', 'click', function (e) { //e.preventDefault(); if (!$.browser.msie) { e.preventDefault(); } var jumpTo = $(this).attr('href'); $('body').find(jumpTo).attr('tabindex', - 1).focus(); }); EDIT: heres a little jsbin example for testing purposes http://jsbin.com/welcome/20846/edit

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• Is possible to remove an event listener in actionscript 3 (flash) ??

  - by DomingoSL

  In the frame 1 of my movie, part of my code is: stage.addEventListener(Event.RESIZE, resizeHandler); It works all fine, but when i go to the frame 2 the listener is still there but the function resizeHandler is not anymore (and i dont want it). So the console output this: TypeError: Error #1009: Cannot access a property or method of a null object reference. at index_fla::MainTimeline/resizeHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at flash.display::Stage/dispatchEvent() at index_fla::MainTimeline/frame2() Is possible to remove the event listener on the frame 2? Thanks!!!

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• C# Why does calling an interface member from a class generate an error?

  - by Jack

  So I have an interface: interface IFoo { int Bar(); int this[int i] {get; set;} } And a class that derives from it class Foo : IFoo { public int IFoo.Bar() { //Implementation { public int IFoo.this[int i] { //Implementation } } Now, I try to do this: var fooey = new Foo(); int i = Fooey.Bar(); or this: int i = Fooey[4]; I would expect these to work properly. However, the compiler generates an error as if such members don't exist. Why is that? I am aware I can cast Foo as IFoo, but I am also aware that casting is costly to performance, which is often the reason to use interfaces in the first place. EDIT 1: These are the errors generated 'Foo' does not contain a definition for 'Bar' and no extension method 'Bar' accepting a first argument of type 'Foo' could be found (are you missing a using directive or an assembly reference?) "Cannot apply indexing to an expression of type 'Foo'"

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• What is the time complexity of LinkedList.getLast() in Java?

  - by i.

  I have a private LinkedList in a Java class & will frequently need to retrieve the last element in the list. The lists need to scale, so I'm trying to decide whether I need to keep a reference to the last element when I make changes (to achieve O(1)) or if the LinkedList class does that already with the getLast() call. What is the big-O cost of LinkedList.getLast() and is it documented? (i.e. can I rely on this answer or should I make no assumptions & cache it even if it's O(1)?)

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• The right way to implement communication between java objects

  - by imoschak

  I'm working on an academic project which simulates a rather large queuing procedure in java. The core of the simulator rests within one package where there exist 8 classes each one implementing a single concept. Every class in the project follows SRP. These classes encapsulate the behavior of the simulator and inter-connect every other class in the project. The problem that I has arisen is that most of these 8 classes are, as is logical i think, tightly coupled and each one has to have working knowledge of every other class in this package in order to be able to call methods from it when needed. The application needs only one instance of each class so it might be better to create static fields for each class in a new class and use that to make calls -instead of preserving a reference in each class for every other class in the package (which I'm certain that is incorrect)-, but is this considered a correct design solution? or is there a design pattern maybe that better suits my needs?

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• Downloading file using FTP client in BlackBerry

  - by AMUL

  Hi i am new to blackberry (7.0) environment. Recently i have been trying to download a file from the server on to the sdcard of the simulaotr through a FTP client. After searching a lot, i have not been able to find a reference for how to code a FTP. Can anyone please help or provide me a link where i can get a sample code of how to download a file using FTP. Also when i was working in Android environment previously, i made use of external jar file of FTP. But in Blackberry that same jar file is of no use. So please help me its part of my project...

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• C# directory to "play with"

  - by Adam S

  Simple question here. I have a C# program which needs to stores some files onto the hard drive, but I don't need them to be anywhere useful to the end-user, only somewhere that the program can read/write from. Is there a directory that I can reference programmatically to be my "filespace playground" - that is, that I can read/write freely to and from? EDIT: Also, if I use a temp directory, how long are the files guaranteed to be there? I don't want the them to disappear while my program is still running!

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• Lambda expression will not compile

  - by John Soer

  I am very confused. I have this lamba expression: tvPatientPrecriptionsEntities.Sort((p1, p2) => p1.MedicationStartDate .Value .CompareTo(p2.MedicationStartDate.Value)); Visual Studio will not compile it and complains about syntax. I converted the lamba expression to an anonymous delegate as so: tvPatientPrecriptionsEntities.Sort( delegate(PatientPrecriptionsEntity p1, PatientPrecriptionsEntity p2) { return p1.MedicationStartDate .Value .CompareTo(p2.MedicationStartDate.Value); }); and it works fine. The project uses .NET 3.5 and I have a reference to System.Linq.

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• Changing the context of a self-executing function

  - by TaylorMac

  This code is copied directly from: http://www.bennadel.com/blog/2264-Changing-The-Execution-Context-Of-Your-Self-Executing-Function-Blocks-In-JavaScript.htm // Set the singleton value to the return value of the self- // executing function block. var singleton = (function(){ // Declare a private variable. var message = "Stop playing with your context!"; this.getMessage = function(){ return( message ); }; // Return this object reference. return( this ); }).call( {} ); // alert the singleton message. alert( "Message:", singleton.getMessage()); ?My thought is that I can use this to better contain the variables and functions in my programs. However, when I try to run the code in a JSfiddle: http://jsfiddle.net/xSKHh/ It does not return the message. What am I missing?

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• SQL update a table with a foreign key

  - by drousseau

  I have a categories table, which one of the fields serves as the foreign key for a sub-categories table. One field that serves as part of the primary key for each table is the language id. I need to update these in both tables. Basically, wherever the language id = x in both tables, I need to set it to y. When I try to do an update on either table, I get a 'The UPDATE statement conflicted with the REFERENCE constraint..' which refers to the foreign key constraint. How can I update the language field on both of these tables?

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• [Flex] Modify components that is not included in the current state?

  - by user322896

  In Flex 4, is it possible to modify components that is not include in the current state? For example, I have labelA included in stateA, how do I change the label text in stateB? If I directly change the label text in stateB, I'll get an null reference error message. One workaround is to include labelA in all states, and set it to be invisible in states other than stateA. However, if the number of this kind of component goes too large, the work becomes tedious, and also I don't think it's reasonable to include unnecessary UI components in unrelated states. Is there better solution for this situation? Thanks! Regards

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• can I get .class from generic type argument?

  - by Mike S

  I have the following class: public abstract class MyClass<T extends Object> { protected T createNewFromData(Reader reader){ GSON.fromJSON(reader,T.class); // T.class isn't allowed :( } } How do I pass a Class<T instance into there? Is there some wierd and wacky work around? Is there a way to get a Class<T reference other than from a pre-instantiated Object of type T? It won't let me do this either: T t = new T(); Class<T> klass = t.class; ANSWER BELOW Thanks to the accepted answer, here is the solution: Type type = new TypeToken<T>(){}.getType(); return gson.fromJson(reader, type);

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• Is there a faster way to remove un-referenced controls from a Form's designer file?

  - by Eric

  I started looking into the designer file of one of my Forms and noticed that a lot of the old controls I thought I had deleted are still being instantiated but are not actually used on the form. Is there any easy way to clean up these controls from the designer file that are not being used? Right now I've printed out a list of all the private fields at the bottom of the designer file that reference the controls of the form. I'm going down the list one by one trying to determine if the control is actually used or not, and then deleting those that I find are not on the form. The document outline is useful for figuring out what controls are on the form, but this is still a rather tedious process. Does anyone have a better way?

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• Python 2.7 creating a multidimensional list

  - by poop

  I don't know why I am having so much trouble creating a 3 dimensional list. I need the program to create an empty n by n list. So for n = 4: x = [[[],[],[],[]],[[],[],[],[]],[[],[],[],[]],[[],[],[],[]]] I've tried using: y = [n*[n*[]]] y = [[[]]* n for i in range(n)] Which both appear to be creating copies of a reference. I've also tried naieve application of the list builder with little success: y = [[[]* n for i in range(n)]* n for i in range(n)] y = [[[]* n for i in range(1)]* n for i in range(n)] I've also tried building up the array iteratively using loops, with no success. In my rapid flurry of attempts to not post something stupidly easy to SO, I came upon a solution: y = [] for i in range(0,n): y.append([[]*n for i in range(n)]) Is there an easier/ more intuitive way of doing this?

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• using jquery $.post() for returning multiple values

  - by Aninemity

  Hi all I am trying to use a $.post() in the following way: $.post("file.php", { file_id: $(this).val()}, function(data){...} The file.php then does a database query and returns an array with a title, description and image reference. What I want to do then is be able to update the .val() for form fields for each. I understand how to do this on a single variable, it would just be the following: $.post("file.php", { file_id: $(this).val()}, function(data){ $('#title').val(data); } But, how do I get the data returned to be recognizable in jquery as either separate variables or as an array? Thanks in advance

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• How can I loop through all the open instances of a particular form?

  - by raz3r

  I need to update a ListBox of a Form2 created dinamically. Let's say that in the event where I have to update this ListBox (in Form1 of course) I don't have a reference of this Form2 so I can't call the UpdateList method (and no, I can't make it static). I don't even know if there is a Form2 opened, it could be or not. What do you suggest? Is there a way to loop through all the open istances of Form2? Code Sample: //Form1 public void event() { //UPDATE FORM2 LISTBOX } //SOMEWHERE IN FORM1 Form2 runTime = new Form2(); //Form2 public void UpdateList() { //UPDATE LISTBOX }

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• Is there any reason I shouldn't do database calls from the destructor?

  - by ryeguy

  I want to create a sort of datamapper library, where you'd do something like this: $users = Users::getTable(); $users->add($newUser1); $users->add($newUser2); Now $users contains 2 user records, but they aren't yet persisted to the database. To be efficient, I'd like to flush them all at once. I would like to have a flush() method to do this (not an issue), but I'd also like for it to happen implicitly when the $users table reference falls out of scope. Is there any reason I shouldn't do this in the destructor?

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• How does * work in Python

  - by Deqing

  Just switched from C++ to Python, and found that sometimes it is a little hard to understand ideas behind Python. I guess, a variable is a reference to the real object. For example, a=(1,2,5) meaning a - (1,2,5), so if b=a, then b and a are 2 references pointing to the same (1,2,5). It is a little like pointers in C/C++. If I have: def foo(a,b,c): print a,b,c a=(1,3,5) foo(*a) What does * mean here? Looks like it expands tuple a to a[0], a[1] and a[2]. But why print(*a) is not working while print(a[0],a[1],a[2]) works fine?

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• What are some Coldfusion (mx7 and greater) "Gotchas" that I should know about?

  - by jakeonrails

  I just spent half the day troubleshooting what is apparently a rather famous gotcha for Coldfusion MX7 and below: The nested query loop bug: Where you are required to reference the current_row of the outer query or else you will only see the first record. For example: <cfloop query="outer"> <cfloop query="innner"> <p>#outer.field#</p><!--- this won't work, you'll only get the first row ---> <p>#outer.field[current_row]#</p><!--- you must do this instead ---> </cfloop> </cfloop> Are there any other ways in which ColdFusion does not work in the obvious way?

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• Rsync module path needs to be a home directory

  - by Malfist

  I'm trying to use rsync to backup windows servers to an rsync server. I'm having problems with rsync on the linux side though, it doesn't like symlinks. Currently I'm trying to use the module path of ~/backup, but rsync says that the chroot failed. I looked up what to do and saw that I needed to add the option use chroot = no and munge symlinks = no. That fixed the @ERROR: chroot failed but now it's telling me @ERROR: chdir failed and the log files say that there is no ~/backup directory. I know the user I'm authenticating with has a backup folder in his directory. How can I fix this? For reference I'm using a .NET port of rsync called NetSync and tunneling it over a port forwarded SSH connection generated with granados.

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• Help in restructuring a project

  - by mrblah

  I have a commerce application, asp.net mvc. I want it to be extensible in the sense others can create other payment providers, as long as they adhere to the interfaces. /blah.core /blah.web /blah.Authorize.net (Implementation of a payment provider using interfaces Ipaymentconfig and paymentdata class) Now the problem is this: /blah.core - PaymentData /blah.core.interfaces - IPaymentConfig where Payment Data looks like: using blah.core; public class PaymentData { public Order Order {get;set;} } IPayment data contains classes from blah.core like the Order class. Now I want to use the actual Authorize.net implementation, so when I tried to reference it in the blah.core project I got a circular dependency error. How could I solve this problem? Many have said to break out the interfaces into their own project, but the problem is PaymentData references entities that are found in blah.core also, so there doesn't seem to be a way around this (in my head anyhow). How can I redesign this?

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