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• How to Deserialize Missing Fields To Nulls

  - by Nathan

  I am working on a .NET project where several versions of the same type of object have been created over the life of the project - most new versions add a field or two. However, now I am looking to mitigate problems for users with an old version. My goal is that when a user tries to open an old version of the serialized object with the new program, the program will automatically assign default values to the fields that are missing from the depreciated version of the file. For example, say I had a class with two boolean fields - RepeatSound and RepeatForever. The first version of the program doesn't know how to repeat forever, so it only saved RepeatSound: <anyType xsi:type="Sound"> <RepeatSound>true</RepeatSound> </anyType> but the new files look like this: <anyType xsi:type="Sound"> <RepeatSound>true</RepeatSound> <RepeatForever>true</RepeatForever> </anyType> My goal is that when I deserialize the first file in the new program that it will create the Sound object but simply default the value of RepeatForever to false. Right now trying to deserialize the first object would throw an exception. Thank you in advance for any responses

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• Is jQuery always the answer?

  - by Kibbee

  I've come across a couple questions, such as this one, and I really have to wonder why "Use jQuery" seems to be the answer when somebody asks how to do something in JavaScript. I understand that jQuery can save you a lot of time, and can help you out a lot, especially when you are doing a lot of fancy JavaScript in your site. However, in instances like this, and in many other instances, it seems like it's just jumping around the problem instead of answering the question. I also feel like this builds too much dependency into libraries. I've seen way too many developers that simply rely too much on libraries, and if they encounter a situation where they didn't have the library, they would be completely unable to function. I feel like there are already enough developers who don't know JavaScript, without just telling everybody to not learn JavaScript, and use jQuery. So, just to reiterate the question. Do you think there's too much of a tendency to use jQuery, for small pieces of JavaScript, when most of the functionality of jQuery isn't being used. Should developers be fluent in the use of bare JavaScript so they don't get too dependent on using libraries? [Additional related conversation topic] Does the existence of jQuery give too much slack to web browser developers who write the JavaScript engines? If we just have workarounds to cover all the inconsistencies in JavaScript, what pressure is there on browser makers to ensure that their JavaScript library works as it should. I feel like this extrapolates the same problem discussed in SO Podcast #36 of "be conservative in what you send, liberal in what you accept". By being so liberal with bad JavaScript engines, and using a common library to work around the flaws, we are promoting their use, and extending the problem.

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• Why can't I use accented characters next to a word boundary?

  - by Rexxars

  I'm trying to make a dynamic regex that matches a persons name. It works without problems on most names, until I ran into accented characters at the end of the name. Example: Some Fancy Namé The regex I've used so far is: /\b(Fancy Namé|Namé)\b/i Used like this: "Goal: Some Fancy Namé. Awesome.".replace(/\b(Fancy Namé|Namé)\b/i, '<a href="#">$1</a>'); This simply won't match. If I replace the é with a e, it matches just fine. If I try to match a name such as "Some Fancy Naméa", it works just fine. If I remove the word last word boundary anchor, it works just fine. Why doesn't the word boundary flag work here? Any suggestions on how I would get around this problem? I have concidered using something like this, but I'm not sure what the performance penalties would be like: "Some fancy namé. Allow me to ellaborate.".replace(/([\s.,!?])(fancy namé|namé)([\s.,!?]|$)/g, '$1<a href="#">$2</a>$3') Suggestions? Ideas?

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• Rails Polymorphic Association with multiple associations on the same model

  - by Matt Rogish

  My question is essentially the same as this one: http://stackoverflow.com/questions/1168047/polymorphic-association-with-multiple-associations-on-the-same-model However, the proposed/accepted solution does not work, as illustrated by a commenter later. I have a Photo class that is used all over my app. A post can have a single photo. However, I want to re-use the polymorphic relationship to add a secondary photo. Before: class Photo belongs_to :attachable, :polymorphic => true end class Post has_one :photo, :as => :attachable, :dependent => :destroy end Desired: class Photo belongs_to :attachable, :polymorphic => true end class Post has_one :photo, :as => :attachable, :dependent => :destroy has_one :secondary_photo, :as => :attachable, :dependent => :destroy end However, this fails as it cannot find the class "SecondaryPhoto". Based on what I could tell from that other thread, I'd want to do: has_one :secondary_photo, :as => :attachable, :class_name => "Photo", :dependent => :destroy Except calling Post#secondary_photo simply returns the same photo that is attached via the Photo association, e.g. Post#photo === Post#secondary_photo. Looking at the SQL, it does WHERE type = "Photo" instead of, say, "SecondaryPhoto" as I'd like... Thoughts? Thanks!

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• How to improve Java performance on Informix for Windows

  - by Michal Niklas

  I have problem with performance of Java UDR functions on Informix on Windows. On this server I already have some functions in C and SPL. I chose one function to write it in those 3 languages and I measured performance of this function on test table. Function calculates some kind of checksum so it does not use any db libraries etc. only string and math operations. I observed performance on 30k records with SQL like: select function(txt) from _tmp_perf_test and I changed function to 'function_c, function_spl or function_java. My performance tests showed that C function is the fastest, SPL function is about 5 times slower, where Java is 100 (one hundred!) times slower than C. I checked it few times and 1:100 ratio didn't improve. I changed Java function to simply return length of the string but even this do not help so it looks, that there is general problem with Java function invocation, because there was no difference in time between Java function that calculate checksum and Java function that returns length of the string. I increased JVM_MAX_HEAP_SIZE to 128 and it not helped too. I use IBM Informix Dynamic Server Version 11.50.TC6DE. The same test on Linux server: IBM Informix Dynamic Server Version 11.50.FC6 show more "normal" results, i.e. Java is slower from C and SPL but only 2 to 5 times. What can I do to improve Java performance on Informix server on Windows? More info about Java on servers: c:\Informix\extend\krakatoa\jre\bin>java -version java version "1.5.0" Java(TM) 2 Runtime Environment, Standard Edition (build pwi32dev-20081129a (SR9-0 )) IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Windows Server 2003 x86-32 j9vmwi3223-20081129 (JIT enabled) J9VM - 20081126_26240_lHdSMr JIT - 20081112_1511ifx1_r8 GC - 200811_07) JCL - 20081129 [root@informix11 bin]# ./java -version java version "1.5.0" Java(TM) 2 Runtime Environment, Standard Edition (build pxa64devifx-20071025 (SR6b)) IBM J9 VM (build 2.3, J2RE 1.5.0 IBM J9 2.3 Linux amd64-64 j9vmxa6423-20071005 (JIT enabled) J9VM - 20071004_14218_LHdSMr JIT - 20070820_1846ifx1_r8 GC - 200708_10) JCL - 20071025

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• Why is an Add method required for { } initialization?

  - by Dan Tao

  To use initialization syntax like this: var contacts = new ContactList { { "Dan", "[email protected]" }, { "Eric", "[email protected]" } }; ...my understanding is that my ContactList type would need to define an Add method that takes two string parameters: public void Add(string name, string email); What's a bit confusing to me about this is that the { } initializer syntax seems most useful when creating read-only or fixed-size collections. After all it is meant to mimic the initialization syntax for an array, right? (OK, so arrays are not read-only; but they are fixed size.) And naturally it can only be used when the collection's contents are known (at least the number of elements) at compile-time. So it would almost seem that the main requirement for using this collection initializer syntax (having an Add method and therefore a mutable collection) is at odds with the typical case in which it would be most useful. I'm sure I haven't put as much thought into this matter as the C# design team; it just seems that there could have been different rules for this syntax that would have meshed better with its typical usage scenarios. Am I way off base here? Is the desire to use the { } syntax to initialize fixed-size collections not as common as I think? What other factors might have influenced the formulation of the requirements for this syntax that I'm simply not thinking of?

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• jeditable not updating browser display - leaves "click to edit..." after succesful edit

  - by Enoch

  I am using jeditable fairly simply and it all works fine, updates the database, etc. The only problem I have is after the user types the new value data and hits enter it doesn't update the field in the browser to show the new value - instead it puts "Click to edit..." in place of it. Am I missing something like a return value from my php file? the php fucntion just takes the args and updates the database - and it works fine. Enoch the jquery\jeditable code $('.edit').editable('update.php',{ id: 'field', name: 'val', indicator: 'Saving...', tooltip: 'Click to edit...', select : true, submitdata : { db : "pers", kn : "key", rec : "?php echo $rec; ?" } }); the div <div class="edit" id="svc_ad1"><?php echo $row-svc_ad1; ?>< /div> i also have a css class for pEdit edit{ float:left; width:200px; height:15px; margin-bottom:5px; border-bottom:1px solid #aaaaaa; }

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• How to avoid game rendering component circular references?

  - by CodexArcanum

  I'm working on a simple game design, and I wanted to break up my game objects into more reusable components. But I'm getting stuck on how exactly to implement the design I have in mind. Here's an example: I have a Logger object, whose job is simply to store a list of messages and render them to screen. You know, logging. Originally the Logger just held the list, and the game loop rendered it's contents. Then I moved the rendering logic into the Logger.Draw() method, and now I want to move it further into a LoggerRenderer object. In effect, I want to have the game loop call RenderAll, which will then call Logger.Render, which will in turn call the LoggerRenderer.Render and finally output the text. So the Logger needs to contain a Renderer object, but the Renderer needs access to the Logger's state (the message queue) in order to render. How do I resolve that? Should I be passing in the message queue and other state information explicitly to the Render method? Or should the game loop be calling the Renderer directly and it links back to the logger, but the RenderAll method never actually sees the logger object itself? This feels kind of like Command pattern, but I'm botching it up terribly.

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• Is there a standard lexer/parser tool for Python?

  - by Salim Fadhley

  A volunteer job requires us to convert a large number of LaTeX documents into ePub format. It's a series of open-source fiction book which has so far only been produced only on paper via a print on demand service. We'd like to be able to offer the book to users of book-reader devices (such as Kindle) which require the ePub format for best results. Fortunately, ePub is a very simple format, however there's no trivial way for LaTeX to produce the XHTML outut required. We experimented with alternative LaTeX compilers (e.g. plastex) but in the end we figured that it would probably be a lot easier to simply write our own compiler which understands a tiny subset of the LaTeX language and compiles directly to XHTML / ePub. Previously I used a tool on Windows called GOLD. This allowed me to go directly from BNF grammars to a stub parser. It also alllowed me to implement the parser in any language I liked. (I'd choose Python). This product has to work on Linux, so I'm wondering if there's an equivalent toolchain that works as well under Ubutnu / Eclipse / Python. The idea is that we will take the grammar of TeX and just implement a teeny subset of that, but we do not want to spend a huge amount of time worrying about grammar and parsing. A parser generator would obviously save us a great deal of time. Sal UPDATE 1: Bonus marks for a solution with excellent documentation or tutorials.

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• Why won't my program terminate?

  - by Qwertie

  I have a .NET Compact Framework app that can runs on three windows machines (Desktop windows and two WinCE machines) and on the WinCE devices, the process never terminates on exit, even if I call Application.Exit(). Besides .NET, it uses one COM component (which does everything on the UI thread). If I break into the debugger after exitting, Visual Studio shows only one thread and a completely blank call stack. What could possibly cause this? Update: My process is terminating on the desktop but not the WinCE machines. I tried to force the process to terminate with the following code, but it doesn't work: [DllImport("coredll.dll")] static extern int TerminateProcess(IntPtr hProcess, uint uExitCode); static public void ExitProcess() { if (Platform.IsWindowsCE) TerminateProcess(new IntPtr(-1), 0); Application.Exit(); } There are also supposed to be ExitProcess() and GetCurrentProcess() APIs like the following, but if I try to call them, I get EntryPointNotFoundException. Therefore I am using TerminateProcess(-1, 0) because the documentation for the desktop version of GetCurrentProcess claims that it simply returns -1. [DllImport("coredll.dll")] static extern int ExitProcess(IntPtr hProcess); [DllImport("coredll.dll")] static extern IntPtr GetCurrentProcess(); Even if I do this: static public void ExitProcess() { if (Platform.IsWindowsCE) TerminateProcess(new IntPtr(-1), 0); Application.Exit(); throw new Exception("Trying to force quit."); } A fatal error dialog appears with a helpful "Quit" button, but pushing the button still does not cause the process to terminate on either machine!

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• session regeneration in tomcat ?

  - by shrini1000

  Hi, I am using Spring security to secure my Java web application which is deployed in tomcat. I found out that it is vulnerable to session fixation attacks because tomcat does not create a new session upon successful log in. On debugging some more, here's what I found. For the following code (which is supposed to create a new session - pl. note, it's just a snippet and not full code): HttpSession session = request.getSession(false); session.invalidate(); session = request.getSession(true); // we now have a new session I thought a new session will be created, but tomcat simply uses the same session that got invalidated and hence the session id does not change. I searched online and found a solution which uses a 'valve' - http://marvinsmutterings.blogspot.com/2010/02/fixing-session-fixation-in-liferay-on.html but could not get it to work because it's looking for a jboss logging class and when I add it to lib, I get a reflection exception and the server doesn't start up. I'm using tomcat 5.5.28. Will be glad to have any pointers. Pl. let me know if you need more details, since I don't want to make this post too long. Sincere thanks!

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• jackson failing to map empty array with No content to map to Object due to end of input

  - by ijabz

  I send a query to an api and map the json results to my classes using Jackson. When I get some results it works fine, but when there are no results it fails with java.io.EOFException: No content to map to Object due to end of input at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2766) at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2709) at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1854) at com.jthink.discogs.query.DiscogsServerQuery.mapQuery(DiscogsServerQuery.java:382) at com.jthink.discogs.query.SearchQuery.mapQuery(SearchQuery.java:37)* But the thing is the api isn't returning nothing at all, so I dont see why it is failing. Here is the query: http://api.discogs.com/database/search?page=1&type=release&release_title=nude+and+rude+the+best+of+iggy+pop this is what I get back { "pagination": { "per_page": 50, "pages": 1, "page": 1, "urls": {}, "items": 0 }, "results": [] } and here is the top level object Im trying to map to public class Search { private Pagination pagination; private Result[] results; public Pagination getPagination() { return pagination; } public void setPagination(Pagination pagination) { this.pagination = pagination; } public Result[] getResults() { return results; } public void setResults(Result[] results) { this.results = results; } } Im guessing the problem is something to do with the results array being returned being blank, but cant see what Im doing wrong EDIT: The comment below was correct, although I usually receive { "pagination": { "per_page": 50, "pages": 1, "page": 1, "urls": {}, "items": 0 }, "results": [] } and in these cases there is no problem but sometimes I seem to just get an empty String. Now Im wondering if the problem is how I read from the inputstream if (responseCode == HttpURLConnection.HTTP_OK) InputStreamReader in= new InputStreamReader(uc.getInputStream()); BufferedReader br= new BufferedReader(in); while(br.ready()) { String next = br.readLine(); sb.append(next); } return sb.toString(); } although I dont read until I get the response code, is it possible that the first time I call br.ready() that I call it before it is ready, and therefore I don't read the input EDIT 2: Changing above code to simply String line; while ((line = br.readLine()) != null) { sb.append(line); } resolved the issue.

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• What makes merging in DVCS easy?

  - by afriza

  I read at Joel on Software: With distributed version control, the distributed part is actually not the most interesting part. The interesting part is that these systems think in terms of changes, not in terms of versions. and at HgInit: When we have to merge, Subversion tries to look at both revisions—my modified code, and your modified code—and it tries to guess how to smash them together in one big unholy mess. It usually fails, producing pages and pages of “merge conflicts” that aren’t really conflicts, simply places where Subversion failed to figure out what we did. By contrast, while we were working separately in Mercurial, Mercurial was busy keeping a series of changesets. And so, when we want to merge our code together, Mercurial actually has a whole lot more information: it knows what each of us changed and can reapply those changes, rather than just looking at the final product and trying to guess how to put it together. By looking at the SVN's repository folder, I have the impression that Subversion is maintaining each revisions as changeset. And from what I know, Hg is using both changeset and snapshot while Git is purely using snapshot to store the data. If my assumption is correct, then there must be other ways that make merging in DVCS easy. What are those?

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• Using htaccess rewrite/redirect so single PHP file can display data according to GET/POST variables

  - by revive

  Hey gang, Bear with me as I try to learn more about .htaccess redirect rules - I'm a UI guy by profession and I'm doing my best to enhance my coding skills languages other than HTML/CSS/PHP, etc So, what I have is an index.php file that contains a menu - pretty simple. If Javascript is enabled on the users computer then forms are shown below the menu using simple jQuery goodies, with each link having a 'return false;' applied. What I am trying to do is make the page accessible with JS turned off, so instead of redirecting the user to a different page, I would like to use POST or GET variables from each link, to show the various forms.. within the same index.php file - but have the URL reflect the menu choice Here is an example using menu items named - Home, About, Form1 and Form2: With JS on, clicking on of the above example buttons simply slides the form or containing the data down onto the page. With JS off, if the user clicks the 'About' link, I would like to rewrite the URL to be http://domain.com/about - but keep the user on the index.php page (since it is the only page) and be able to use POST or GET variable to show the using PHP. So, accessing http://domain.com/index.php?page=about would show http://domain.com/about in the URL but pass the GET variable 'page' to the index.php file. Hope that makes sense.. and I'm sure there are many ways to accomplish this, so if you have ideas of how to improve on it, by all means, I'd love to hear it ! Thanks again Revive

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• Accessing Static Methods on a Generic class in c#

  - by mrlane

  Hello, I have the following situation in code, which I suspect may be a bit dodgey: I have a class: abstract class DataAccessBase<T> : IDataAccess where T : AnotherAbstractClass This class DataAccessBase also has a static factory method which creates instances of derived classes of itself using an enum value in a which statement to decide which derived type to create: static IDataAccess CreateInstance(TypeToCreateEnum) Now, the types derived from DataAccessBase<T> are themselves NOT generic, they specify a type for T: class PoLcZoneData : DataAccessBase<PoLcZone> // PoLcZone is derived from AnotherAbstractClass So far I am not sure if this is pushing the limits of good use of generics, but what I am really concerned about is how to access the static CreateInstance() method in the first place: The way I am doing this at the moment is to simply pass any type T where T : AnotherAbstractClass. In particular I am passing AnotherAbstractClass itself. This allows compilation just fine, but it does seem to me that passing any type to a generic class just to get at the statics is a bit dodgey. I have actually simplified the situation somewhat as DataAccessBase<T> is the lower level in the inheritance chain, but the static factory methods exists in a middle tier with classes such as PoLcZoneData being the most derived on the only level that is not generic. What are peoples thoughts on this arrangement?

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• Custom DataType in DataTemplate breaks WPF designer

  - by PRINCESS FLUFF

  Why does the DataTemplate line break the WPF designer in Visual Studio 2008? The program compiles and runs properly. The DataTemplate is applied as it should. However the entire DataTemplate block of code is underlined in red, and when I simply "build" the program without running, I get the error "Type reference cannot find public type named 'Character'" How come it can't find it in the designer yet the program applies the template properly? <UserControl x:Class="WPF_Tests.Tests.TwoCollecViews.TwoViews" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:DetailsPane="clr-namespace:WPF_Tests.Tests.DetailsPane" > <UserControl.Resources> <DataTemplate DataType="{x:Type DetailsPane:Character}"> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Path=Name}"></TextBlock> </StackPanel> </DataTemplate> </UserControl.Resources> <Grid> <ListBox ItemsSource="{Binding Path=Characters}" /> </Grid> </UserControl> EDIT: I am being told that this may be a bug in Visual Studio 2008, as it worked correctly in 2010. You can download the code here: http://www.mediafire.com/?z1myytvwm4n - The Test/TwoCollec xaml file's designer will break with this code.

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• SyntaxHighlighter and Line Break Tags

  - by azamsharp

  I am using the following syntax highligher: http://alexgorbatchev.com/wiki/SyntaxHighlighter For some reason when it encounter <br> it simply prints out <br> tags. I cannot replace the whole thing with System.Environment.NewLine since it will mess up the complete description. Here is my code: public static string GetDescription(string description) { string codeStartPattern = "&lt;code&gt;"; string codeEndPattern = "&lt;/code&gt;"; Regex reg = new Regex(codeStartPattern); description = reg.Replace(description, ReplaceWithStartDiv); reg = new Regex(codeEndPattern); description = reg.Replace(description, ReplaceWithEndDiv); return description; } private static string ReplaceWithStartDiv(Match m) { return "<script type='syntaxhighlighter' class='brush: csharp'><![CDATA["; } private static string ReplaceWithEndDiv(Match m) { return "]]></script>"; } I guess I only need to replace <br> with System.Environment.Newline with the code that is between the <code> snippet here </code> Thanks!

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• Using custom coordinates with QGraphicsScene

  - by Rob

  I am experimenting with a WYSIWYG editor that allows a user to draw shapes on a page and the Qt graphics scene support seems perfect for this. However, instead of working in pixels I want all my QGraphicsItem objects to work in tenths of a millimetre but I don't know how to achieve this. For example: // Create a scene that is the size if an A4 page (2100 = 21cm, 2970 = 29.7cm) QGraphicsScene* scene = new QGraphicsScene(0, 0, 2100, 2970); // Add a rectangle located 1cm across, 1cm down, 5cm wide and 2cm high QGraphicsItem* item = scene->addRect(100, 100, 500, 200); ... QGraphicsView* view = new QGraphicsView(scene); setCentralWidget(view); Now, when I display the scene above I want the shapes to appear at correct size for the screen DPI. Is this simply a case of using QGraphicsView::scale or do I have to do something more complicated? Note that if I was using a custom QWidget instead then I would use QPainter::setWindow and QPainter::setViewport to create a custom mapping mode but I can't see how to do this using the graphics scene support.

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• Upload image from Silverlight to ASP .net MVC 2.0 Action

  - by Raha

  Hello ... I have been trying really hard to Upload a photo from a Silverlight app to ASP .net MVC app. I simply use WebClient like this in Silverlight : private bool UploadFile(string fileName, Stream data) { try { UriBuilder ub = new UriBuilder("http://localhost:59933/Admin/Upload"); ub.Query = string.Format("filename={0}", fileName); WebClient wc = new WebClient(); wc.OpenReadCompleted += (sender, e) => { PushData(data, e.Result); e.Result.Close(); data.Close(); }; wc.OpenWriteAsync(ub.Uri); } catch (Exception) { throw; } return true; } private void PushData(Stream input, Stream output) { byte[] buffer = new byte[4096]; int byteRead; while ((byteRead = input.Read(buffer, 0, buffer.Length)) != 0) { output.Write(buffer, 0, byteRead); } } On the other hand I have created a simple action called Upload like this: [AcceptVerbs(HttpVerbs.Post)] public ActionResult Upload() { //Some code here } The problem is that it doesn't hit the break point in Upload method. Is this even possible ? The reason why I am using Silverlight is that I want to preview the image before uploading it to server and it is very simple in Silverlight. I failed to do that in JavaScript and that is why Silverlight might be more useful here.

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• Iphone CATextLayer doesn't show it's text.

  - by lovecactus

  Here is my new bee issue: I was simply trying to add a CATextlayer in an UIView layer. However, according to the following code, I only get the CATextlayer's background color be displayed in the UIView, without any text. Just wonder what did I missed to display the text. Could anyone ofter a hint/sample how to use CATextlayer? Thanks. (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) { // Custom initialization CATextLayer *TextLayer = [CATextLayer layer]; TextLayer.bounds = CGRectMake(0.0f, 0.0f, 100.0f, 100.0f); TextLayer.string = @"Test"; TextLayer.font = [UIFont boldSystemFontOfSize:18].fontName; TextLayer.backgroundColor = [UIColor whiteColor].CGColor; TextLayer.wrapped = NO; //TextLayer.backgroundColor = [UIColor blueColor]; self.view = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 100.0f)]; self.view.backgroundColor = [UIColor blueColor]; [self.view.layer addSublayer:TextLayer]; [self.view.layer layoutSublayers]; } return self; }

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• Need to format character precedence in Strings.

  - by Christian

  I'm currently writing a Roman Numeral Converter for the fun of it. The problem works up to the aforementioned character precedence. Since Roman Numerals are not positional, i.e. III does not symbolize 1*whatever base^2 + 1*whatever base^1 + 1*whatever base^0. That of course makes it hard when somebody types in XIV and I need to make sure that the I is not added in this case, but rather subtracted. I'm not sure how to do this. What would be the best approach to tackle this? I have both the Roman Symbols and their respective decimal numbers stored in arrays: const char cRomanArray[] = "IVXLCDM"; const int romanArray[] = { 1, 5, 10, 50, 100, 500, 1000 }; so it wouldn't be too hard for me to brute-force the damn thing by simply checking the precedence within the array, i.e. if the symbol is smaller than the next symbol, i.e. in the exampe 'XIV' if 'I' is smaller than 'V', in which case it would be because I have ordered them in the array, then I could make it subtract the value instead of add. But this seems like a very ugly solution. Are there perhaps any better ones? I was thinking something along the lines of Regular Expressions maybe( forgive me if that sounds like a horrible idea, I haven't used RegExp yet, but it sounds like it could do what I need, and that's to determine the characters in a string.)

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• Any book on designing and implementing a CRPG engine?

  - by Fabzter

  Hi! First, let me tell you, I am not really interested in making my own rpg engine (at least not in the near future, hehe), but I do feel like I want to understand the internals of how a rpg engine works. Why? Well, because I like to read about programming and design, It keeps me motivated and excited, and because I know I will learn a lot, for, even when I have been programming for some years now, I never stop considering myself an ignorant... there are simply SO many things involving a game engine (specially rpg ones, like branching storylines, and items and economics!) I'm eager to know. I've been searching (and thus, finding) lots of info online, but it is never focused in what I'm interested (most of it talks about the mathematics and AI algorithms implementation, which I know quite well), which is the design of overall structure, patterns, scripting engine, decision engine... damn, so many things I can't even imagine, since I've never done any game programming. I hope you know have an idea of how I feel, and how I want to learn for the sake of learning, and why would I want you to tell me if you know if there exist books touching the topics that interest me the most.

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• Retrieve click() handler in jQuery for later use

  - by Xiong Chiamiov

  I'm using the jQuery tablesorter plugin to sort a table, which assigns .click() handlers to the <th>s in the table. Since my table has alternating colors for each column, I've built a simple fix_table_colors(identifier) function that does as it should when I call it manually using Firebug. I would like, however, to have that automatically called after a sort. To do this, I decided to retrieve the .click() handler from the <th>s, and assign a new handler that simply calls the previous handler, followed by fix_table_colors(). (This SO question is similar, but uses standard onClick() attributes, which won't work here.) From the accepted answer to this question, I have created the following code: $(document).ready(function() { $("table.torrents").tablesorter({ debug: true, headers: { 1: { sorter: 'name' }, 2: { sorter: 'peers' }, 3: { sorter: 'filesize' }, 4: { sorter: 'filesize' }, 5: { sorter: 'filesize' }, 6: { sorter: 'ratio' } } }); $('table.torrents thead th').each(function() { var th = $(this); var clickHandler = th.data('events').click[0]; th.click(function() { clickHandler(); fix_table_colors('table.torrents'); }); }); }); While this is conceptually correct, clickHandler doesn't appear to actually be a function, and so I cannot call it. With a bit more digging in Firebug, I found that click[3] appears to hold the function I'm looking for (and click[10] my new one). I get an 'e is undefined' error on line 2 of tablesorter.min.js when using that, though. Am I even going down the right path? I have a feeling that with what I've found so far, I can make this work, but it's going to be much uglier than I would expect it needs to be.

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• My simple program runs on Android emulator, but not on my Nexus One

  - by noisesolo

  To clarify, I have no trouble getting the Nexus One connected in developer's mode. I can actually get Eclipse to "run" my program on my Nexus One. However, my Nexus One simply gets stuck in a reboot loop. I've also created an .apk file and put it onto my Nexus One, installing it with apkInstaller. However, it crashed while installing. I see my app on my phone, but I'm kind of afraid to run it. I am not doing anything fancy in my program; all it does is generate text by shuffling a couple arrays of strings together. It uses a bunch of text views, two buttons, and a spinner. I have only edited the main source file, the strings XML file, and the layout XML file, nothing else. It's a 2.1-update1 program and it runs fine on the emulator. Does anyone have any idea what's going on? I'm using Windows 7 (32 bit) and my Nexus One is running Cyanogen 5.0.7.1. I'm pretty sure it's my code that's causing the problem. Now I'm just wondering if there are any common mistakes that would lead my app to run on the emulator but not on my device. Thanks in advance.

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• Cladogram, tree of life, cladistics, taxonomy in JS or canvas?

  - by boblet

  Good people - I need some help to find a way to create an interactive cladogram or phylogenetic tree (yes, I have read all related posts, and do not find what I am looking for). The thing is, I need the nodes to be name-able. An example would be something like this Most scripts I find are either applets, flash, or simply do not show the node classification, ie it would skip "feliformia" in this example. This is useless to me, as I would then end up with carnivore - anonymous node - anonymous node - anonymous node - tiger, and that is not good. This tree will in theory cover all life, so it could get rather large, and get links and names in english and latin from database. So: no flash, no applets. It must be horizontal, no supertrees (circular). I have gone through this http://bioinfo.unice.fr/biodiv/Tree_editors.html but most of them seems to be either old, not displaying sub-node levels, applets, or way too complex. I imagine this would be a delightful job for canvas/jQuery..? And chances are, someone got there before me? Any pointers much appreciated. Note: if anyone out there would like to do something like this as a project, I will be happy to help, even though it would not benefit me for this project.This type of taxonomy is not as simple as it may seem, and I would be happy see this happen.

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