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• Migrating from Forms to WPF

  - by Jason Williams

  We're considering migrating a WinForms app to WPF, but are just starting on the WPF learning curve now that 4.0 is out. What I'd like to do is migrate our application commands (cut, copy, paste, etc) to a WPF-like command-binding system, while still running as a WinForms app - but in such a way as to make the migration easy when we go ahead with WPF. The ideal approach would be to implement our commands using the WPF command interfaces, classes and events directly, and simply hooking the WinForms events up to them with our own dispatcher. Has anyone tried something like this or know if it might be possible?

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• How can I create a collection of references in C#

  - by Jonathan Kaufman

  Ok I am having a cross language hiccup. In C# with it's great collections like List and I have: a Map class with properties of: List<byte[]> Images; List<Tile> Tiles; a Tile Class of: byte[] ImageData; int X; int Y; Now I want to add an image to the Map class and have the ImageData property of the Tile Classes to "reference" it. I have discovered I can't just assign it Images[0]. You can't have a reference to an object of a List. My fix was to create a Dictionary. Is this the best way or can I somehow have a "pointer" to a collection of objects?

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• Partial form with nested routes

  - by jerhinesmith

  I have two models -- User and Entry -- that are related through a has_many relationship (a User has many Entries). I'm using RESTful routing, and have the following in my routes.rb file: map.resource :user, :controller => "users" do |user| user.resources :entries end This seems to work, but in my partial _form file, when I do this: form_for [@current_user, @entry] do |f| # Form stuff end It generates a URL like this: /user/entries.%23%3Cuser:0xb6a6aea8%3E instead of /user/entries Am I missing something? I should note that the correct classes are applied to the form when doing creation vs. editing, so it does seem to be correctly interpreting what I'm trying to do -- it's just that I can't submit the form to an invalid url.

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• Grails domain class initialization

  - by Don

  Hi, My Grails app has the following Spring bean defined in spring/resources.groovy calendarService(CalendarService) { bean -> bean.initMethod = "init" } This method looks something like: class CalendarService { void init() { User.findByEmail("[email protected]") } } When I call the dynamic finder findByEmail I get a MissingMethodException. My guess is that I'm trying to call this method too early, i.e. before the domain classes have had the dynamic finders added to their metaclass. One solution would be to call CalendarService.init() myself from Bootstrap.init, rather than instructing Spring to call it, but is there a better solution? Thanks, Don

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• Inject WCF proxy with credentials using StructureMap

  - by Steve Horn

  I have a service proxy generated by svcutil which generated an interface(IStudentContract) and a concrete type implementing (StudentContractClient). I'd like to have instances of StudentContractClient injected into my classes via StructureMap. My proxy also needs to have credentials supplied as seen in this passing unit test: <Test()> _ Public Sub Then_the_web_service_call_should_not_throw_an_exception() Dim studentServiceProxy As New StudentContractClient Dim credential As New NetworkCredential credential.Domain = ConfigurationManager.AppSettings("something") credential.UserName = ConfigurationManager.AppSettings("something") credential.Password = ConfigurationManager.AppSettings("something") studentServiceProxy.ClientCredentials.Windows.ClientCredential = credential Dim result = studentServiceProxy.GetCurrentTeachersByStudentSepid(26899) result.Count.ShouldEqual(4) End Sub My question is what would the structuremap configuration look like to have instances of IStudentContract injected with the credentials supplied? Thanks for any help!

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• Interface and base class mix, the right way to implement this

  - by Lerxst

  I have some user controls which I want to specify properties and methods for. They inherit from a base class, because they all have properties such as "Foo" and "Bar", and the reason I used a base class is so that I dont have to manually implement all of these properties in each derived class. However, I want to have a method that is only in the derived classes, not in the base class, as the base class doesn't know how to "do" the method, so I am thinking of using an interface for this. If i put it in the base class, I have to define some body to return a value (which would be invalid), and always make sure that the overriding method is not calling the base. method Is the right way to go about this to use both the base class and an interface to expose the method? It seems very round-about, but every way i think about doing it seems wrong... Let me know if the question is not clear, it's probably a dumb question but I want to do this right.

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• Should i use HttpResponse.End() for a fast webapp?

  - by acidzombie24

  HttpResponse.End() seems to throw an exception according to msdn. Right now i have the choice of returning a value to say end thread (it only goes 2 functions deep) or i can call end(). I know that throwing exceptions is significantly slower (read the comment for a C#/.NET test) so if i want a fast webapp should i consider not calling it when it is trivially easy to not call it? -edit- I do have a function call in certain functions and in the constructor in classes to ensure the user is logged in. So i call HttpResponse.End() in enough places although hopefully in regular site usage it doesn't occur too often.

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• Process for linking static ObjC libraries in XCode

  - by madmik3

  I'm trying to link to a static library and I keep getting linker errors. I've found a few sites that post examples but I have not been able to see what I am doing wrong. First I create a project that will link to my lib add existing files find my .xcodeproj file select "Copy items into destination groups folder"... Select my host project as Add To Targets. Then I add a direct dependency to my host app expand targets double click MyHost.app click + under direct dependencies select my lib Then I set build flags double click MyHost application icon in Groups and Files. click the build tab then I set the OtherLinerFlag to -ObjC then I set Header Search Paths to my header file location for my static library. I pass the compile stage but any classes in my static lib cause linker error: literal-pointer@_OBJC@_cls_refs@SomeClass in MyHost.o thanks!

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• Mimic an HTTPRequest and HTTPResponse object in Java

  - by Ankur

  How do I mimic an HTTPServletRequest and HTTPServletResponse object. The reason is I want to test the behaviour of some servlets. I know JUnit probably provides this functionality but I don't know how to use it (I will learn soon) and need to do this reasonably quickly. HTTPServletRequest and HTTPServletResponse are both interfaces so they can't be instantiated. There is a HttpServletRequestWrapper which implements HttpServletRequest but it doesn't seem to have any setParameter() type methods and HttpServletResponse doesn't seem to have any implementing classes at all. How can I test my code by passing a suitable HttpServletRequest object and then checking that the received HttpServletResponse object matches what I expect?

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• Problem with assigning elements of a class array to individual variables in MATLAB

  - by Marc

  This is a bit of a duplicate of this question, this question, and this question, however those solutions don't work, so I'm asking mine. I've got an array of locally defined classes and I'd like to assign it to multiple, individual variables. This pattern doesn't work: %a is 2x1 of MyClass temp = mat2cell(a); [x,y] = temp{:}; %throws: ??? Insufficient number of outputs from right hand side of equal sign to satisfy assignment. Because temp is a single cell, with my 2x1 array in one cell, rather than a 2x1 cell array with one element of each of my original array in one cell. Any ideas?

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• What is the relationship between IRimTable and PersistenceStore?

  - by Martin

  The BlackBerry Desktop API has the interface IRimTable which apparently maps an "application database" on a BlackBerry device to a virtual structure (i.e, IRimTable has IRimRecords, each of which has IRimField) that developer can browse the handheld device data when it is connected to a desktop computer. Meanwhile, applications in the handheld device can store its data in PersistenceStore databases. The point where I'm stuck is the PersistenceStore API doesn't define any Table or Records or Fields. Does anybody knows what is the relationship between these two classes? And how does the mapping work (if at all) ?

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• What is the worst class/variable/function name you have ever encountered

  - by Chris Noe

  Naming things well is arguably Job 1 for professional programmers. Yet we have all suffered from some bad naming choices from time to time. So just to vent a little, what are some doozies that you may have run across? Just to get things started: One of our original developers wasn't sure what to call a secondary key - on what turned out to be a primary table for this app - so he called it: DL2WhateverTheHellThatIs. Unfortunately this system generates entity mappings from the XML, and attributes defined there result in classes, methods, and constants that are referenced through-out the app. To this day it is very hard to find a source file that does not reference this, er, thing! A few actual examples: DL2WhateverTheHellThatIsBean cos = (DL2WhateverTheHellThatIsBean)itr.next(); String code = getDL2WhateverTheHellThatIs().getCode(); From from = new From("DL2WhateverTheHellThatIs"); String filter = "_dL2WhateverTheHellThatIs._code"; (Very difficult to refactor)

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• C++ method declaration, class definition problem

  - by John Fra.

  I have 2 classes: A and B. Some methods of class A need to use class B and the opposite(class B has methods that need to use class A). So I have: class A; class B { method1(A a) { } } class A { method1(B b) { } void foo() { } } and everything works fine. But when I try to call foo() of class A from B::method1 like this: class B { method1(A a) { a.foo(); } } I get as result compile errors of forward declaration and use of incomplete type. But why is this happening? (I have declared class A before using it?)

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• Compiler doesn't find methods from base class

  - by Paul

  I am having a problem with my virtual methods in a derived class. Here are my (simplified) C++ classes. class Base virtual method accept( MyVisitor1* v ) { /*implementation is here*/ }; virtual method accept( MyVisitor2* v ) { /*implementation is here*/ }; virtual method accept( MyVisitor3* v ) { /*implementation is here*/ }; class DerivedClass virtual method accept( MyVisitor2* v ) { /*implementation is here*/ }; The following use causes VS 2005 to give: "error C2664: 'DerivedClass::accept' : cannot convert parameter 1 from 'Visitor1*' to 'Visitor2 *'". DerivedClass c; MyVisitor1 v1; c.accept(v1); I was expecting the compiler to find and call Base::accept(MyVisitor1) for my DerivedClass as well. Obviously this is not working, but I don't understand why. Any ideas? Thanks, Paul

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• Generics and Exposing .Net Types For COM Consumers?

  - by IbrarMumtaz

  I remember seeing a question on my official MS 70-536 exam that talked about a simple class that was designed to be exposed for COM calling clients and etc. of all the members defined in the classes I chose the answer D. The one that used a generic. My question to you guys is this: If you were designing a .net custom type that was to be eventually consumed by a com caller or a com type .... of all the guidelines I have read on this subject. Generics is the one .Net topic I would not include in a class for this purpose I would omit such a data member or use something else? Am I right in thinking this. As soon as I saw this question I knew it was generics but I can't seem to prove it. Surely I did not make this up ... generics is a .net feature right?

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• flex/actionscript assignment failing?

  - by user346713

  I'm seeing something weird in my actionscript code I have two classes foo and bar, bar extends foo. In a model class I have a foo member variable, I assign an bar object to the foo variable. But after the assignment the foo variable is null. [Bindable] public var f:foo; public function someFunc(arr:ArrayCollection):void { if(arr.length > 0) { var tempBar:bar = arr.getItemAt(0) as bar; if(tempBar != null) { tempBar.someProp++; f = tempBar; // f is now null } } } Any ideas on what I could be doing wrong?

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• Parsing a dynamic value with Lift-JSON

  - by Surya Suravarapu

  Let me explain this question with an example. If I have a JSON like the following: {"person1":{"name": "Name One", "address": {"street": "Some Street","city": "Some City"}}, "person2":{"name": "Name Two", "address": {"street": "Some Other Street","city": "Some Other City"}}} [There is no restriction on the number of persons, the input JSON can have many more persons] I could extract this JSON to Persons object by doing var persons = parse(res).extract[T] Here are the related case classes: case class Address(street: String, city: String) case class Person(name: String, address: Address, children: List[Child]) case class Persons(person1: Person, person2: Person) Question: The above scenario works perfectly fine. However the need is that the keys are dynamic in the key/value pairs. So in the example JSON provided, person1 and person2 could be anything, I need to read them dynamically. What's the best possible structure for Persons class to account for that dynamic nature.

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• Ruby on Rails: How to find all items with a hash that contain a specific value...

  - by kingjeffrey

  Suppose I have three models: Student, SchoolClass, and DayOfWeek. There is a HABTM relationship between Student and SchoolClass, and between SchoolClass and DayOfWeek. What I'd like to do is find all school classes belonging to a given student that meet on Monday. Now I suppose I could do something like: @student = Student.find(:student_id) @student_classes = @student.school_classes.find(:all) @student_classes_on_monday = Array.new @student_classes.each do |student_class| if student_class.day_of_week.include?("Monday") @student_classes_on_monday << student_class end end But there has to be a more elegant way. Can you help me find it?

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• Should I use the Model-View-ViewModel (MVVM) pattern in Silverlight projects?

  - by Jon Galloway

  One challenge with Silverlight controls is that when properties are bound to code, they're no longer really editable in Blend. For example, if you've got a ListView that's populated from a data feed, there are no elements visible when you edit the control in Blend. I've heard that the MVVM pattern, originated by the WPF development community, can also help with keeping Silverlight controls "blendable". I'm still wrapping my head around it, but here are some explanations: http://www.nikhilk.net/Silverlight-ViewModel-Pattern.aspx http://mark-dot-net.blogspot.com/2008/11/model-view-view-model-mvvm-in.html http://www.ryankeeter.com/silverlight/silverlight-mvvm-pt-1-hello-world-style/ http://jonas.follesoe.no/YouCardRevisitedImplementingTheViewModelPattern.aspx One potential downside is that the pattern requires additional classes, although not necessarily more code (as shown by the second link above). Thoughts?

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• Extending Windows Desktop using C#

  - by Lijo

  Hi Team, I am trying to customize my Windows XP’s desktop using C# code. This is my first venture of this kind. Could you please point me to some documentation that will Give the names of classes that can be used for extending/customizing Windows’ desktop Some example code What I am trying to do specifically is as follows I am planning to customize the desktop. When I unlock my computer (by entering user name and password) the files should come(by flying) into their required places. Initially the files are to be located in the right end corner. Thanks Lijo Cheeran Joseph

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• Code jumps out of a jar and runs? What is causing this?

  - by Mike

  I am trying to get a sample program working with JUNG, a graphing tool in Java. I downloaded and referenced all the .jar files in eclipse so my project hierarchy looks like this: In Test.java I have the following code: public class Test { static public void main() { System.out.print("Hello"); }} For some reason though when I try to run it as a Java Application by right clicking on Jung test in the project hierarchy I am presented with a bunch of classes. My Test.java isn't on the list so if I just leave it as ** and press ok it starts running a program that is dynamically adding nodes and vertexes to a graph. I can't seem to figure out what code its actually executing. I know java but stuff like this with the jar files seems to be getting lost on me. Any ideas? Thanks

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• DocuSign Connect xsd [on hold]

  - by Brian

  I'm trying to parse xml inbound to our system from the DocuSign Connect service (which publishes status updates to a given web service). I typiclly use jaxb to process xml but as far as I know I need xsd's in order to generate the jaxb. I don't have (or can't find) xsd's from DocuSign in order to do this. I could use other java classes/libraries to parse the xml but without xsd's I'd have to guess at types, restrictions and formats. Is there a way to generate jaxb without having xsd's?

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• I need help translating this portion of the ECMAScript grammar?

  - by ChaosPandion

  I've been working on my own implementation of ECMAScript for quite some time now. I have basically done everything by hand to help gain a deep understanding of the process. Repeated attempts to analyze and understand this portion of the grammar have failed so I've been working on the run time instead. Now I am at a point were I will be working on object literals so I really need to polish my syntactic analyzer. Can anyone put this in terms a language parser novice could understand? My biggest source of confusion is the following: new MemberExpression Arguments This is supposed to be a member expression, but this seemingly conflicts with the following: NewExpression : MemberExpression new NewExpression Is a new expression a member expression or a left hand side expression? To be honest I am having trouble laying out the proper C# classes for the concrete grammar. MemberExpression : PrimaryExpression FunctionExpression MemberExpression [ Expression ] MemberExpression . IdentifierName new MemberExpression Arguments NewExpression : MemberExpression new NewExpression CallExpression : MemberExpression Arguments CallExpression Arguments CallExpression [ Expression ] CallExpression . IdentifierName LeftHandSideExpression : NewExpression CallExpression

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• Recommended Python publish/subscribe/dispatch module ?

  - by Eli Bendersky

  From PyPubSub: Pypubsub provides a simple way for your Python application to decouple its components: parts of your application can publish messages (with or without data) and other parts can subscribe/receive them. This allows message "senders" and message "listeners" to be unaware of each other: one doesn't need to import the other a sender doesn't need to know "who" gets the messages, what the listeners will do with the data, or even if any listener will get the message data. similarly, listeners don't need to worry about where messages come from. This is a great tool for implementing a Model-View-Controller architecture or any similar architecture that promotes decoupling of its components. There seem to be quite a few Python modules for publishing/subscribing floating around the web, from PyPubSub, to PyDispatcher to simple "home-cooked" classes. Can you recommend a module that works well in most cases ? Which modules have you had positive experience with ? Negative ? Thanks in advance

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• Getting Prepared/Planning

  - by The.Anti.9

  For the first time, I am trying to create a rather large .NET project. I think the largest one I have made so far was about 6 classes, but this one is already at 14. For the section I'm starting to work on, I'm having some trouble putting everything together in my head, which is what I normally do. I think it's just a little too complex for that. I want to plan it out, and I want some way to visualize it and be able to play with it and manipulate the structure easily. Is there any sort of (free) program I can use to do this?

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