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• Joda-Time: Period to string

  - by tt

  I'm using the Joda-Time library with Java. I'm having some difficulty trying to turn a Period object to a string in the format of "x days, x hours, x minutes". These Period objects are first created by adding an amount of seconds to them (they are serialized to XML as seconds and then recreated from them). If I simply use the getHours() etc. methods in them, all I get is zero and the total amount of seconds with getSeconds. How can I make Joda calculate the seconds into the respective fields, like days, hours, etc...?

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• calling Overloaded method from a generic method.

  - by asela38

  How to create a generic method which can call overloaded methods? I tried but it gives a compilation error. Test.java:19: incompatible types found : java.lang.Object required: T T newt = getCloneOf(t); ^ import java.util.*; public class Test { private Object getCloneOf(Object s) { return new Object(); } private String getCloneOf(String s) { return new String(s); } private <T> Set<T> getCloneOf(Set<T> set){ Set<T> newSet = null; if( null != set) { newSet = new HashSet<T>(); for (T t : set) { T newt = getCloneOf(t); newSet.add(newt); } } } }

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• Is WPF Decorator class useful?

  - by darja

  I need to create control to draw border around its child. So, I have created class and derived it from Decorator: class RoundedBoxDecorator : Decorator { protected override Size ArrangeOverride(Size arrangeSize) { //some source } protected override void OnRender(DrawingContext dc) { //some source } } It works fine, but I have some doubts about using Decorator as ancestor. I have found in MSDN that there are no special methods or properties in it, only derived from its ancestors (UIElement or FrameworkElement). ArrangeOverride and OnRender are also derived. So, what for Decorator class was designed and does it makes sense to use it? Or I can derive from FrameworkElement?

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• load/unload C dll with C# problems

  - by Goran

  I'm having problems with external native DLL. I'm working on ASP.NET 1.1 web application and have this DLL which I load through DLLImport directives. This is how I map DLL functions: [DllImport("somedllname", CallingConvention=CallingConvention.StdCall)] public static extern int function1(string lpFileName,string lpOwnerPw,string lpUserPw); [DllImport("somedllname", CallingConvention=CallingConvention.StdCall)] public static extern int function2(int nHandle); I call the dll methods and all works great, but I have problems with this DLL crashing my web site on some cases, so I would like an option to unload the dll after I use it. I found a solution at this link, but I don't have 'UnmanagedFunctionPointer' attribute in .NET 1.1 available. http://blogs.msdn.com/jonathanswift/archive/2006/10/03/Dynamically-calling-an-unmanaged-dll-from-.NET-_2800_C_23002900_.aspx Is there a way I can achieve what this guy did with his example?

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• Which collection interface should I use in .NET for COM-interop?

  - by jhominal

  That is a followup from my previous question, but you don't need to read it to understand that one. I'm designing an interface in .NET that would be consumed from COM applications (mainly VB6, but Visual C++ 6 is also a possibility) and I would like to use Collection types as argument and return types for the methods in the interface. Questions: What happens to the VB6 built-in collection types (arrays, collections, dictionaries) when they go through interop? My current guess is that: arrays - System.Array collections - Microsoft.VisualBasic.Collection dictionaries - System.Collections.Hashtable Is that correct? Which interfaces should I use as return types? IEnumerable, ICollection, IList, IDictionary? Would I be able to do a For Each in VB6 to iterate over these interfaces? Should I use the generic or non-generic variants of the interfaces?

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• ASP/NET MVC: Test Controllers w/Sessions? Mocking?

  - by Codewerks

  I read some of the answers on here re: testing views and controllers, and mocking, but I still can't figure out how to test an ASP.NET MVC controller that reads and sets Session values (or any other context based variables.) How do I provide a (Session) context for my test methods? Is mocking the answer? Anybody have examples? Basically, I'd like to fake a session before I call the controller method and have the controller use that session. Any ideas?

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• How far does Dependency Injection reach?

  - by Baddie

  My web app solution consists of 3 projects: Web App (ASP.NET MVC) Business Logic Layer (Class Library) Database Layer (Entity Framework) I want to use Ninject to manage the lifetime of the DataContext generated by the Entity Framework in the Database Layer. The Business Logic layer consists of classes which reference repositories (located in the database layer) and my ASP.NET MVC app references the business logic layer's service classes to run code. Each repository creates an instance of the MyDataContext object from the Entity Framework Repository public class MyRepository { private MyDataContext db; public MyRepository { this.db = new MyDataContext(); } // methods } Business Logic Classes public class BizLogicClass { private MyRepository repos; public MyRepository { this.repos = new MyRepository(); } // do stuff with the repos } Will Ninject handle the lifetime of MyDataContext despite the lengthy dependency chain from the Web App to the Data Layer?

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• iPhone - Bug using CADisplayLink and UIControls - bad to mix openGL and UIControls?

  - by Adam

  Having had problems using other methods, I've decided to stick with CADisplayLink to run my game loop. The animation is smooth now, but sometimes there's a problem where the buttons and other UI elements can't be used, can't be accessed by touch or changed programmatically. This includes UIButtons and UILabels. Has anyone encountered this before? Is it not a good idea in general to use interface builder and uicontrols on top of an OpenGL view? I've heard they don't play well together but haven't heard the reasons. Thanks!

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• Substituting Java for Groovy Little By Little

  - by yar

  I have been checking out Groovy a bit and I feel that moving a Java program to Groovy little by little -- grabbing a class and making it a Groovy class, then converting the method guts a bit at a time -- might be a relatively sane way to take advantage of some of the Groovy language features. I would also do new classes in Groovy. Questions: Is this a reasonable way to convert? Can I keep all of my public methods and and fields in Java? Groovy is "just" a superset, right? What kinds of things would you not do in Groovy, but prefer Java instead?

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• When should I use String.Format or String.Concat instead of the concatenation operator?

  - by Kramii

  In C# it is possible to concatenate strings in several different ways: Using the concatenation operator: var newString = "The answer is '" + value + "'."; Using String.Format: var newString = String.Format("The answer is '{0}'.", value); Using String.Concat: var newString = String.Concat("The answer is '", value, "'."); What are the advantages / disadvantages of each of these methods? When should I prefer one over the others? The question arises because of a debate between developers. One never uses String.Format for concatenation - he argues that this is for formatting strings, not for concatenation, and that is is always unreadable because the items in the string are expressed in the wrong order. The other frequently uses String.Format for concatenation, because he thinks it makes the code easier to read, especially where there are several sets of quotes involved. Both these developers also use the concatenation operator and String.Builder, too.

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• how to store BigInteger values in oracle database.

  - by Bipul

  I have connected Java program to Oracle database using JDBC. I want to store BigInteger values(512 bits) in the database. What should be the type of the column? I m trying like this: I have taken a column of number type in the database. I converted BigInteger to BigDecimal like this: BigInteger b=new BigInteger("5779857570957802579079"); Number n =b; BigDecimal d=(BigDecimal)n; PreparedStatement pstmt=con.prepareStatemant("insert into database values(?,?)"); pstmt.setString(1,"john"); pstmt.setBigDecimal(2,d); I am getting the following exception: javax.servlet.ServletException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.math.BigDecimal root cause java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.math.BigDecimal Is there anything wrong in this code snippet? If there is, please suggest other methods.

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• Reducing piracy of iPhone applications

  - by Alex Reynolds

  What are accepted methods to reduce iPhone application piracy, which do not violate Apple's evaluation process? If my application "phones home" to provide the unique device ID on which it runs, what other information would I need to collect (e.g., the Apple ID used to purchase the application) to create a valid registration token that authorizes use of the application? Likewise, what code would I use to access that extra data? What seem to be the best available technical approaches to this problem, at the present time? (Please refrain from non-programming answers about how piracy is inevitable, etc.)

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• Drools Rules: How can I use a method on "when" section?

  - by manoelhc

  Hi, I need to execute a method on "when" section of a DSLR file and I´m not sure if it´s possible. Example: rule "WNPRules_10" when $reminder:Reminder(source == "HMI") $user:User(isInAgeRange("30-100")==true) Reminder(clickPercentual >= 10) User(haveAtLeastOptIns("1,2,3,4") == true) then $reminder.setPriority(1);update($reminder); end (note: isInAgeRange() and haveAtLeastOptIns() are methods of User) I tried with eval() and no errors appeared, but it didn´t execute. Like this: rule "WNPRules_10" when $reminder:Reminder(source == "HMI") $user:User(eval($user.isInAgeRange("30-100")==true)) Reminder(clickPercentual >= 10) User(eval($user.haveAtLeastOptIns("1,2,3,4") == true)) then $reminder.setPriority(1);update($reminder); end How can I resolve this problem?

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• Handling changes in an interface shared across multiple solutions?

  - by Anthony Mastrean

  Our "main" solution is the development code: shared libraries, services, UI projects, etc. The other solution is an integration and automated tests solution. It references several of the development projects. The reason it is separate is to avoid interference with the development solution's unit test VSMDI file. And to allow us to play with different execution methods (other test runners, like Gallio or StoryTeller) without interfering with the development solution. Recently, an interface changed in the development solution, one of our test mocks implemented that interface. But, it was not updated because there was no warning at compile time because it was in another solution. This broke our CI build. Does anyone have a similar setup? How do you handle these issues, do you follow a strict procedure or is there some kind of technical answer?

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• Android process killer

  - by Martin

  I have similar question, maybe you can help. Is it possible to get list of all process which are running in the Android system, and kill some of them? I know that there are some applications (task managers), but I would like to write my own, simple application. I would like to write simple task manager, just list of all process and button which will kill some of them. Could you just write some Java methods which I can call in order to get list of process, and method for killing them. Or just give me some advices. Thanks for answers. Regards Martin

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• How to use DAOs with hibernate/jpa?

  - by Ari

  Assuming the DAO structure and component interaction described below, how should DAOs be used with persistence layers like hibernate and toplink? What methods should/shouldn't they contain? Would it be bad practice to move the code from the DAO directly to the service? For example, let's say that for every model we have a DAO (that may or may not implement a base interface) that looks something like the following: public class BasicDao<T> { public List<T> list() { ... } public <T> retrieve() { ... } public void save() { ... } public void delete() { ... } } Component interaction pattern is -- service DAO model

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• smarter character replacement using ruby gsub and regexp

  - by agriciuc

  Hi guys! I'm trying to create permalink like behavior for some article titles and i don't want to add a new db field for permalink. So i decided to write a helper that will convert my article title from: "O "focoasa" a pornit cruciada, împotriva barbatilor zgârciti" to "o-focoasa-a-pornit-cruciada-impotriva-barbatilor-zgarciti". While i figured out how to replace spaces with hyphens and remove other special characters (other than -) using: title.gsub(/\s/, "-").gsub(/[^\w-]/, '').downcase I am wondering if there is any other way to replace a character with a specific other character from only one .gsub method call, so I won't have to chain title.gsub("a", "a") methods for all the UTF-8 special characters of my localization. I was thinking of building a hash with all the special characters and their counterparts but I haven't figured out yet how to use variables with regexps. What I was looking for is something like: title.gsub(/\s/, "-").gsub(*replace character goes here*).gsub(/[^\w-]/, '').downcase Thanks!

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• Like Html.RenderAction() but without reinstantiating the controller object

  - by Jørn Schou-Rode

  I like to use the RenderAction extension method on the HtmlHelper object to render sidebars and the like in pages, as it allows me to keep the data access code for each such part in separate methods on the controller. Using an abstract controller base, I can define a default "sidebar strategy", which can then be refined by overriding the method in a concrete controller, when needed. The only "problem" I have with this approach, is that the RenderAction is built in a way where it always creates a news instance of the controller class, even when rendering actions from the controller already in action. Some of my controllers does some data lookup in their Initialize method, and using the RenderAction method in the view causes this to occur several times in the same request. Is there some alternative to RenderAction which will reuse the controller object if the action method to be invoked is on the same controller class as the "parent" action?

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• Copy Structure To Another Program

  - by Steven

  Long story, long: I am adding a web interface (ASPX.NET: VB) to a data acquisition system developed with LabVIEW which outputs raw data files. These raw data files are the binary representation of a LabVIEW cluster (essentially a structure). LabVIEW provides functions to instantiate a class or structure or call a method defined in a .NET DLL file. I plan to create a DLL file containing a structure definition and a class with methods to transfer the structure. When the webpage requests data, it would call a LabVIEW executable with a filename parameter. The LabVIEW code would instantiate the structure, populate the structure from the data file, then call the method to transfer the data back to the website. Long story, short: How do you recommend I transfer (copy) an instance of a structure from one .NET program to a VB.NET program? Ideas considered: sockets, temp file, xml file, config file, web services, CSV, some type of serialization, shared memory

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• Java File and ByteArray or InputStream - please quick help

  - by Peter Perhác

  I want to use jFuge to play some MIDI music in an applet. There's a class for the MIDI pattern - Pattern - and the only method to load the pattern is from a File. Now, I don't know how applets load files and what not, but I am using a framework (PulpCore) that makes loading assets a simple task. If I need to grab an asset from a ZIP catalogue, I can use the Assets class which provides get() and getAsStream() methods. get() returns the given asset as a ByteArray, the other as an InputStream. I need jFuge to load the pattern from either ByteArray or InputStream. In pseudo-code, I would like to do this: Pattern.load(new File(Assets.get("mymidifile.midi"))); however there is no File constructor that would take a ByteArray. Suggestions, please?

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• Instrumentation class in the Android API.

  - by Riyas

  Hi All, I have question on the Android API. Android API provides a class called "Instrumentation" class. What is the use of this class? Is the Instrumentation class be used only together with Junit for unit testing. Can Junit framework can be used to test the methods of the Android API without using the Instrumentation class. Since Junit package has been included in the Android package, I hope we dont need to use install separately for unit testing. I would appreciate if you could provide me the information as i can't find these clear information anywhere on the Web. If we use Junit test framework to test the Android API, can we have test results in the UI format rather than test format.? Thanks a lot. Apprecite your time. Regards, Riyas

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• NSThread vs. NSOperationQueue vs. ??? on the iPhone

  - by kubi

  Currently I'm using NSThread to cache images in another thread. [NSThread detachNewThreadSelector:@selector(cacheImage:) toTarget:self withObject:image]; Alternatively: [self performSelectorInBackground:@selector(cacheImage:) withObject:image]; Alternatively, I can use an NSOperationQueue NSInvocationOperation *invOperation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(cacheImage:) object:image]; NSOperationQueue *opQueue = [[NSOperationQueue alloc] init]; [opQueue addOperation:invOperation]; Is there any reason to switch away from NSThread? GCD is a 4th option when it's released for the iPhone, but unless there's a significant performance gain, I'd rather stick with methods that work in most platforms.

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• Flex 4 - Using .pfm/.pfb fonts

  - by Zed-K

  Hi everyone, I just switched to Flash Builder 4 & Flex 4 SDK, and it seems it's no longer possible to use a .pfm/.pfb font, either by embedding it or using it as a system font. I keep getting error messages, and Google can't find anybody having the same issue. I tried several methods: - copy/pasting the [Embed] statement which was working using Flex 3 SDK - installing the font and then try to simply call it by its name in a CSS declaration without embedding it ; seems to work for every .ttf and .otf system fonts, but not for .pfm/.pfm ones - using a Flash-generated swf which embeds the font So far none of these seems to work. Has anybody got an idea on how to achieve this? I actually don't care using a system font without embedding it as long as it works. I'll be really grateful if somebody could help me on this, I'm totally stuck and cannot use another font instead.

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• Whats the significance of named scope in rails?

  - by piemesons

  Before going for details. Question 1:-- Whats the meaning of scope here (ie named scope)? whats the benefits of using named scope? Now:- from agile development with rails book:-- class Order < ActiveRecord::Base named_scope :last_n_days, lambda { |days| {:conditions => ['updated < ?' , days] } } named_scope :checks, :conditions => {:pay_type => :check} end Such a named scope would make finding the last weeks worth of orders a snap. orders = Orders.last_n_days(7) Scopes can also be combined orders = Orders.checks.last_n_days(7) why we are using named_scope here. We can do the same using methods. Whats special thing we got using named_scope.

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• Image Uploading - security issues

  - by TenaciousImpy

  Hi, I'm developing an ASP.NET Web app and would like the user to be able to either upload an image from their local system, or pass in a URL to an image. The image can either be a JPG or PNG. What security issues should I be concerned about doing this? I've seen various ways of embedding code within JPG files. Are there any methods in C# (or external libraries) which can confirm that a file is a JPG/PNG, otherwise throw an error? At the very least, I'm making the directory which holds uploaded images non-browsable and putting a max size limit of 1mb, but I'd like to implement further checks. Thanks for any advice.

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