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• Using the Specification Pattern

  - by Kane

  Like any design pattern the Specification Pattern is a great concept but susceptible to overuse by an eager architect/developer. I am about to commence development on a new application (.NET & C#) and really like the concept of the Specification Pattern and am keen to make full use of it. However before I go in all guns blazing I would be really interested in knowing if anyone could share the pain points that experienced when use the Specification Pattern in developing an application. Ideally I'm looking to see if others have had issues in Writing unit tests against the specification pattern Deciding which layer the specifications should live in (Repository, Service, Domain, etc) Using it everywhere when a simple if statement would have done the job etc? Thanks in advance

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• UIScrollView won't autorotate

  - by clozach

  My app design requires the same scrolling functionality found in the iPhone's native Photos app when browsing photos in full screen. Specifically: Each view snaps into place as the view is swiped Scrolling happens in only one direction Rotating the iPhone rotates the entire scrolling region as well such that the frame of each subview (photos, in Apple's case) rotates in-place and paging is still in the same direction (left-to-right) I started to use Apple's sample PageControl code as a launching point, and everything was going swimmingly until I attempted adding autorotation to the code. My sense from the docs was that all I had to do to get autorotation working was to add this to the sample code's MyViewController.m - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } While that does seem to cause the subviews' backgrounds to rotate, the UILabels and the enclosing UIScrollView stay fixed so that, from a user perspective, paging through the views now requires up/down flicking instead of left/right.

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• OpenGL Wrapper in .Net

  - by Ngu Soon Hui

  This question is similar to the one here. But I feel that the answers recommended ( such as Tao and OpenTK) are not good enough because they are just a direct port from OpenGL, with no OOP design, and hard to use. What I'm looking for is a .Net OpenGL wrapper that is written in clear OOP principles, easy to use ( easy to apply textual and lighting, easy to debug etc), able to rotate the 3D diagram with mouse ( a feature that is critically missing from OpenGL and TAO), and the ability to export to other file formats ( such as dwg or dxf or Google Map file format). Any suggestion? Both Open source or commercial components would do.

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• SQLite3's dynamic typing

  - by Bradford Larsen

  SQLite3 uses dynamic typing rather than static typing, in contrast to other flavors of SQL. The SQLite website reads: Most SQL database engines (every SQL database engine other than SQLite, as far as we know) uses static, rigid typing. With static typing, the datatype of a value is determined by its container - the particular column in which the value is stored. SQLite uses a more general dynamic type system. In SQLite, the datatype of a value is associated with the value itself, not with its container. It seems to me that this is exactly what you don't want, as it lets you store, for example, strings in integer columns. The page continues: ...the dynamic typing in SQLite allows it to do things which are not possible in traditional rigidly typed databases. I have two questions: The use case question: What are some examples where sqlite3's dynamic typing is, in fact, beneficial? The historical/design question: What was the motivation for implementing sqlite with dynamic typing?

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• Why is -[UISwitch superlayer] being called?

  - by Jonathan Sterling

  I've got sort of a crazy thing going on where I have an NSProxy subclass standing in for a UISwitch. Messages sent to the proxy are forwarded to the switch. Please don't comment on whether or not this is a good design, because in context, it makes sense as an incredibly cool thing. The dealio is that when I try to add this object as an accessory view to a UITableViewCell, I get the following crash: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UISwitch superlayer]: unrecognized selector sent to instance 0x5889740' Yes, I could just set the proxy's target as the accessory view, but then I would have to keep track of the proxy so that I could release it at the right time. So, what I really want is to be able to have the proxy retained by the table cell, and released when it is removed from the view just like a normal accessory view. So, why is -[UISwitch superlayer] (a method which does not exist) being called, and how do I save the world?

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• Best non-development book for software developers

  - by Dima Malenko

  What is the best non software development related book that you think each software developer should read? Note, there is a similar, poll-style question here: What non-programming books should programmers read? Update: Peopleware is a great book, must read, no doubt. But it is about software development so does not count. Update: We ended up suggesting more than one book and that's great! Below is summary (with links to Amazon) of the books you should consider for your reading list. The Design of Everyday Things by Donald Norman Getting Things Done by David Allen Godel, Escher, Bach by Douglas R. Hofstadter The Goal and It's Not Luck by Eliyahu M. Goldratt Here Comes Everybody by Clay Shirky ...to be continued.

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• RESTful API Documentation

  - by PartlyCloudy

  I'm going to design a RESTful API soon, thus I need to describe it in order to enable other people to start implementing clients using it. I've looked around a bit, but unfortunately, I've not found any standardized form of describing web-based RESTful services. What I'am looking for is something like JavaDoc, although it don't have to be generated out of any sort of code. I'm also not talking about something like WADL, I rather want to have some human-readable documentation I can hand out. Due to the nature of RESTful web-based services, it should be quite easy to standardize a documentation. It should just list available ressources, corresponding URIs, allowed methods, content-types and describe the availabe actions. Do you have any suggestions therefore? Thanks in advance & Greets

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• Building a list of favorites from Core Data

  - by Jim

  I'm building an app with two tabs. The first tab has a main tableview that connects to a detail view of the row. The second tab will display a tableView based on the user adding content to it by tapping a button on the detail view. My question is this. What is the correct design pattern to do this? Do I create a second ManagedObjectContext/ManagedObjectContextID then save that context to a new persistent store or can the MOC be saved to the existing store without affecting the original tableview? I've looked at CoreData Recipes and CoreData Books and neither deal with multiple stores although books does deal with multiple MOC's. Any reference would be great.

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• Submit HTML form with GET method with full action path

  - by Manny Calavera

  Hello. I am trying to submit a form with method GET and action "index.php?id=3". The problem is that it jumps to the url specified but it cuts off "?id=3" part. I need that so I can identify an user. Any ideas on how I could submit the whole url ? I don't want to change this method, by design is much complex than I told you here. It's a simple version. Any ideas ? Thanks.

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• Adding an attribute to a class by using properties editor

  - by Fred Yang

  Visual studio allows you to design component visually. For example, you are designing a windows form. You change its property in the properties editor. The IDE will generate the code in a partial class in xx.designer.cs file. We can customize this behavior by changing the UITypeEditor for the properties. The question now is , Can we extend this code generation behavior? for example, we change a setting in property window, and then the IDE will add an .net Attribute to the class? Thanks

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• Problem using Winforms WebBrowser control as editor

  - by thecaptain0220

  I am currently working on a project where I am using a WebBrowser control as an editor. I have design mode turned on and it seems to be working. The issue im having is when I try to save the Document and load another it pops up the "This document has been modified." message. What I am trying to do is as simple as this if (frontPage) { frontPage = false; frontContent = webEditor.DocumentText; webEditor.DocumentText = backContent; } else { frontPage = true; backContent = webEditor.DocumentText; webEditor.DocumentText = frontContent; } Like I said everytime I enter some text and run this code it just pops up a message saying its been modified and asks if I want to save. How can I get around this?

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• Image scaling in C

  - by Ganesh

  Hi, I am designing a jpeg to bmp decoder which scales the image. I have been supplied with the source code for the decoder so my actual work is to design a scaler . I do not know where to begin. I have scouted the internet for the various scaling algorithms but am not sure where to introduce the scaling. So should I do the the scaling after the image is converted into bmp or should I do this during the decoding at the MCU level. am confused :( If you guys have some information to help me out, its appreciated. any material to read, source code to analyse etc....

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• Comparison of ASP.Net Reporting Solutions

  - by Brian MacKay

  This week my team spent way too much time trying to do simple things in reporting services, and I've decided to start evaluating other options. I know there are some good options out there now that aren't too expensive. I've heard that Telerik, ActiveReports, and a few others are widely used. I was hoping to get some first hand accounts regarding reporting tools that you've used. Specifically, I definitely want to hear your thoughts about: Pain points and gotchas you ran into. Ease of use for report design. It's a little bizarre to me that Access still seems to hold the throne in this area! What's your favorite tool? Anything I've missed that seems important to you. Thanks a lot!

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• The Zen of Python distils the guiding principles for Python into 20 aphorisms but lists only 19. What's the twentieth?

  - by Jeff Walden

  From PEP 20, The Zen of Python: Long time Pythoneer Tim Peters succinctly channels the BDFL's guiding principles for Python's design into 20 aphorisms, only 19 of which have been written down. What is this twentieth aphorism? Does it exist, or is the reference merely a rhetorical device to make the reader think? (One potential answer that occurs to me is that "You aren't going to need it" is the remaining aphorism. If that were the case, it would both exist and act to make the reader think, and it would be characteristically playful, thus fitting the list all the better. But web searches suggest this to be an extreme programming mantra, not intrinsically Pythonic wisdom, so I'm stumped.)

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• Hardware Emulator / Simulator for Winforms .Net Application

  - by Suneet

  I have a WinForms .Net HMI software which talks to hardware over USB. I check for communication with the hardware at Load time and if communication is active then run it (The hardware manufacturer has provided a communication library to talk over USB). I want to build an emulator for cases when communication with hardware is not possible (not connected) and want the software to run in simulated mode by providing dummy values for different states of hardware. Has anyone implemented something similar? Any pointers will be helpful. Are there any design patterns to handle such implementations. TIA

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• ASP.NET MVC ajax - data transfer

  - by Grienders

  How can I get result from action? I need to show the commentID on the page (aspx) after successes comment insert. controller [AcceptVerbs(HttpVerbs.Post )] public ActionResult ShowArticleByAjax(Guid id, string commentBody) { Guid commentID = Comment.InsertComment(id, commentBody); //How can I tranfer commentID to the aspx page ??? return PartialView("CommentDetails",Article.GetArticleByID(id)); } ascx <%using (Ajax.BeginForm("ShowArticleByAjax", new { id = Model.ID }, new AjaxOptions { HttpMethod = "Post", UpdateTargetId = "divCommentDetails", OnSuccess = "successAddComment", OnFailure = "failureAddComment", OnBegin = "beginAddComment" })) { %> <p> <%=Html.TextArea("commentBody", new { cols = "100%", rows = "10" })%> </p> <p> <input name="submit" type="image" src="../../Content/Images/Design/button_s.gif" id="submit" /> </p> <%} %> aspx doesn't matter

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• AJAX: how to get progress feedback in web apps, and to avoid timeouts on long requests?

  - by David Dombrowsky

  This is a general design question about how to make a web application that will receive a large amount of uploaded data, process it, and return a result, all without the dreaded spinning beach-ball for 5 minutes or a possible HTTP timeout. Here's the requirements: make a web form where you can upload a CSV file containing a list of URLs when the user clicks "submit", the server fetches the file, and checks each URL to see if its alive, and what the title tag of the page is. the result is a downloadable CSV file containing the URL, and the result HTTP code the input CSV can be very large ( 100000 rows), so the fetch process might take 5-30 minutes. My solution so far is to have a spinning javascript loop on the client site, which queries the server every second to determine the overall progress of the job. This seems kludgy to me, and I'm hesitant to accept this as the best solution. I'm using perl, template toolkit, and jquery, but any solution using any web technology would be acceptable.

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• Real world uses of Reflection.Emit

  - by Ryu

  In all the books I've read on reflection they often say that there aren't many cases where you want to generate IL on the fly, but they don't give any examples of where it does make sense. After seeing Reflection.Emit as a job requirement for a gaming company I was curious where else it's being used. I'm now wondering if there are any situations you've seen in the real world were it was the best solution to the problem. Perhaps it is used as an implementation to a design pattern? Note I imagine PostSharp / AOP uses it.

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• ClearCase: Copy old versions with Snapshot Views under Windows

  - by cogmios

  Using IBM Rational ClearCase: - I have only access to Snapshot Views so NO dynamic Views I want to copy ALL versions from a certain changeset to c:\temp. I have already listed the changeset versions in a file (couple of hundred of versions, I only need the latest one), I do not have a baseline over this older set. What I now have and does not work: #!/usr/bin/perl -w # # PROGRAM: copytest.pl $filename = "Design test123.doc"; $view = "D:\\AdminViews\\ABC_R1_READ_2\\ABCD002\\ABC_DESIGN\\BLA Framework\\P0\\"; $version = "\\main\\ABC_R1_READ\\1"; $printhet = 'cleartool find . -name "' . $filename . '" -version version(' . $version. ') -exec "cmd /c copy %CLEARCASE_XPN% D:\temp\%CLEARCASE_PN%"'; system($printhet);

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• Embedded BI for ASP.NET

  - by Michael Shimmins

  Can anyone recommend a decent business intelligence & reporting application that can be integrated into an OEM application? Primary requirements are: Administrators can define cubes/dimensions etc (or we - the OEM - can predefine some) Report designers can easily inspect data by visually selecting dimensions, filters etc in an adhoc way that is quickly output with little upfront investment Report designers can design a report based on dimensions/filters and save their definition to be run as required Report viewers can view the reports defined by the report designers All of this plus in .NET that can be branded/integrated into our existing web application's look and feel. Permissions need to work off our user/groups system. I've found a few that look good, but they are all in Java and I don't want to ask our clients to install ASP.NET for the app, and then Java, tomcat etc just for reporting. Thanks

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• Desigining problem in asp.net?

  - by Surya sasidhar

  hi, in my application i am displaying a image (image size is 90px width,90px height) and below that i displaying title of the image in data list control (horizontal display). i used table (tags) in source code. the image and title will display dynamically from database. my problem is when title is too long it is disturbing my design, when title is too long it should come down, the title should same size as the picture if it is too long it come down in second line. for example the below is a image and below that image title -------------- | | | | | | | | | | |_____________| surya sasidhar rao the above image title is too long. the letters "rao" should come in second line. -------------- | | | | | | | | | | |_____________| surya sasidhar rao this is the desing i want. how can i get it. this is my source code ' CommandName="Play" CommandArgument='<%#Eval("VideoName")+"|"+Eval("videoid")+","+Eval("username")%' Width ="90px" Height ="90px" / ' CommandName="title" CommandArgument='<%#Eval("VideoName")+"|"+Eval("videoid")+","+Eval("username")%' ' '

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• suggestions for Membership in ASP.NET MVC application

  - by mare

  With this question I am mostly looking for answers from people that have implemented the out-of-the-box ASP.NET membership in their own database - I've set up the tables inside my database and as far as I can see they contain mostly what I need but not everything. I will have the notion of a Firm (Company) to which Users will belong so I will have to associate the aspnet_Users with my Firms table (each user will be a member of exactly one firm). If possible, provide some guidelines how did you do it and what I might run into if I have to modify the table design at some point in the future. Preferably I will be using the default Membership provider. I am having trouble to decide whether to go from scratch or use what ASP.NET already offers.

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• Supporting multiple screen sizes with Android using ImageButtons

  - by droidy

  I've read the Android documentation: http://developer.android.com/guide/practices/screens_support.html but still have some questions. I'm trying to design a music application which basically has images of the instrument (ImageButton) that play a sound when clicked. However, I'm confused about how to have the ImageButtons scale to fit all the different screen sizes and how to position them. Which layout is best used for needing to position ImageButtons in specific locations on the screen? (i.e. cymbals on a drum set) FrameLayout, RelativeLayout? If I only really care about medium and large screens, do I need to create different resources (images) for both as well as a different XML layout to position them? I'm trying to find the simplest way to do this without having to create a separate layout XML file for positioning/size and separate image resources for each screen. Any guidance is greatly appreciated. Thanks!

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• IEditableCollectionView.AddNew() Throwing ArgumentNullException

  - by Eugarps

  In the context of Silverlight RIA using DomainContext and, the code as follows: private void AddProductButton_Click(object sender, RoutedEventArgs e) { var target = (Web.LocatorProduct)((IEditableCollectionView)ProductSource.DataView).AddNew(); target.Locator = LocatorID; target.Product = NewProduct.Text.ToUpper(); ((IEditableCollectionView)ProductSource.DataView).CommitNew(); } Is throwing ArgumentNullException in AddNew(), CreateIdentity() further up on the stack (a generated method) due to product being null. Product and LocatorID are, in combination, the primary key. I'm guessing that EF is not allowing me to generate a new item without meeting database contraints? How does this make sense if I need to obtain a primary key from the user? I have control over all tiers of the application, so suggestions on database design if needed are also welcomed.

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• crossword algorithm....

  - by teddy

  I'm making algorithm like crossword, but i dont know how to design d algorith. for example, there are words like 'car', 'apple' in the dictionary. and the 'app' words is given on the board. and there are letters like 'l' 'e' 'c' 'r'....for making words. so the algorithm work is making correct words which are stored in dictionary. app - lapp- leapp- lecapp- .... - lappe - eappc - ... - appl - apple(correct answer) what is the best solution for this algorithm?

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