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Articles indexed Saturday April 10 2010

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  • What is the best Battleship AI?

    - by John Gietzen
    Battleship! Back in 2003, (when I was 17,) I competed in a Battleship AI coding competition. Even though I lost that tournament, I had a lot of fun and learned a lot from it. Now, I would like to resurrect this competition, in the search of the best battleship AI. Here is the framework: Battleship.zip The winner will be awarded +450 reputation! The competition will be held starting on the 17th of November, 2009. No entries or edits later than zero-hour on the 17th will be accepted. (Central Standard Time) Submit your entries early, so you don't miss your opportunity! To keep this OBJECTIVE, please follow the spirit of the competition. Rules of the game: The game is be played on a 10x10 grid. Each competitor will place each of 5 ships (of lengths 2, 3, 3, 4, 5) on their grid. No ships may overlap, but they may be adjacent. The competitors then take turns firing single shots at their opponent. A variation on the game allows firing multiple shots per volley, one for each surviving ship. The opponent will notify the competitor if the shot sinks, hits, or misses. Game play ends when all of the ships of any one player are sunk. Rules of the competition: The spirit of the competition is to find the best Battleship algorithm. Anything that is deemed against the spirit of the competition will be grounds for disqualification. Interfering with an opponent is against the spirit of the competition. Multithreading may be used under the following restrictions: No more than one thread may be running while it is not your turn. (Though, any number of threads may be in a "Suspended" state). No thread may run at a priority other than "Normal". Given the above two restrictions, you will be guaranteed at least 3 dedicated CPU cores during your turn. A limit of 1 second of CPU time per game is allotted to each competitor on the primary thread. Running out of time results in losing the current game. Any unhandled exception will result in losing the current game. Network access and disk access is allowed, but you may find the time restrictions fairly prohibitive. However, a few set-up and tear-down methods have been added to alleviate the time strain. Code should be posted on stack overflow as an answer, or, if too large, linked. Max total size (un-compressed) of an entry is 1 MB. Officially, .Net 2.0 / 3.5 is the only framework requirement. Your entry must implement the IBattleshipOpponent interface. Scoring: Best 51 games out of 101 games is the winner of a match. All competitors will play matched against each other, round-robin style. The best half of the competitors will then play a double-elimination tournament to determine the winner. (Smallest power of two that is greater than or equal to half, actually.) I will be using the TournamentApi framework for the tournament. The results will be posted here. If you submit more than one entry, only your best-scoring entry is eligible for the double-elim. Good luck! Have fun! EDIT 1: Thanks to Freed, who has found an error in the Ship.IsValid function. It has been fixed. Please download the updated version of the framework. EDIT 2: Since there has been significant interest in persisting stats to disk and such, I have added a few non-timed set-up and tear-down events that should provide the required functionality. This is a semi-breaking change. That is to say: the interface has been modified to add functions, but no body is required for them. Please download the updated version of the framework. EDIT 3: Bug Fix 1: GameWon and GameLost were only getting called in the case of a time out. Bug Fix 2: If an engine was timing out every game, the competition would never end. Please download the updated version of the framework. EDIT 4: Results!

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  • Parse JSON into a ListView friendly output

    - by Thomas McDonald
    So I have this JSON, which then my activity retrieves to a string: {"popular": {"authors_last_month": [ { "url":"http://activeden.net/user/OXYLUS", "item":"OXYLUS", "sales":"1148", "image":"http://s3.envato.com/files/15599.jpg" }, { "url":"http://activeden.net/user/digitalscience", "item":"digitalscience", "sales":"681", "image":"http://s3.envato.com/files/232005.jpg" } { ... } ], "items_last_week": [ { "cost":"4.00", "thumbnail":"http://s3.envato.com/files/227943.jpg", "url":"http://activeden.net/item/christmas-decoration-balls/75682", "sales":"43", "item":"Christmas Decoration Balls", "rating":"3", "id":"75682" }, { "cost":"30.00", "thumbnail":"http://s3.envato.com/files/226221.jpg", "url":"http://activeden.net/item/xml-flip-book-as3/63869", "sales":"27", "item":"XML Flip Book / AS3", "rating":"5", "id":"63869" }, { ... }], "items_last_three_months": [ { "cost":"5.00", "thumbnail":"http://s3.envato.com/files/195638.jpg", "url":"http://activeden.net/item/image-logo-shiner-effect/55085", "sales":"641", "item":"image logo shiner effect", "rating":"5", "id":"55085" }, { "cost":"15.00", "thumbnail":"http://s3.envato.com/files/180749.png", "url":"http://activeden.net/item/banner-rotator-with-auto-delay-time/22243", "sales":"533", "item":"BANNER ROTATOR with Auto Delay Time", "rating":"5", "id":"22243"}, { ... }] } } It can be accessed here as well, although it because it's quite a long string, I've trimmed the above down to display what is needed. Basically, I want to be able to access the items from "items_last_week" and create a list of them - originally my plan was to have the 'thumbnail' on the left with the 'item' next to it, but from playing around with the SDK today it appears too difficult or impossible to achieve this, so I would be more than happy with just having the 'item' data from 'items_last_week' in the list. Coming from php I'm struggling to use any of the JSON libraries which are available to Java, as it appears to be much more than a line of code which I will need to deserialize (I think that's the right word) the JSON, and they all appear to require some form of additional class, apart from the JSONArray/JSONObject script I have which doesn't like the fact that items_last_week is nested (again, I think that's the JSON terminology) and takes an awful long time to run on the Android emulator. So, in effect, I need a (preferably simple) way to pass the items_last_week data to a ListView. I understand I will need a custom adapter which I can probably get my head around but I cannot understand, no matter how much of the day I've just spent trying to figure it out, how to access certain parts of a JSON string..

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  • problem to genrate swf file.

    - by nemade-vipin
    hello friend I have created one flex Air application where I have created the one authentication actionscript class. and one mxml file.This complete application using webservice and google map API. but when I am building application it is not genrating the SWF file in bin-debug folder. that is changes not reflecting in our application. my code is:- Action script class is :- package src { import adobe.utils.XMLUI; import mx.rpc.events.FaultEvent; import mx.controls.Alert; import generated.webservices.*; import mx.collections.ArrayCollection; public class Authentication { [Bindable] private var childName:ArrayCollection; [Bindable] private var childId:ArrayCollection; private var photoFeed:ArrayCollection; private var arrayOfchild:Array; private var newEntry:GetSBTSMobileAuthentication; public function authentication():void { // Instantiate a new Entry object. user = new SBTSWebService(); if(user!=null) { user.addSBTSWebServiceFaultEventListener(handleFaults); user.addgetSBTSMobileAuthenticationEventListener(authenticationResult); newEntry = new GetSBTSMobileAuthentication(); if(newEntry!=null) { newEntry.mobile=mobileno.text; newEntry.password=password.text; user.getSBTSMobileAuthentication(newEntry); } } } public function handleFaults(event:FaultEvent):void { Alert.show("A fault occured contacting the server. Fault message is: " + event.fault.faultString); } public function authenticationResult(event:GetSBTSMobileAuthenticationResultEvent):void { if(event.result != null && event.result._return>0) { if(event.result._return > 0) { var UserId:int = event.result._return; loginform.enabled = false; //getChildList(UserId); viewstack2.selectedIndex=1; } else { Alert.show("Authentication fail"); } } } } } mxml file is :- import src.Authentication; var user:Authentication = new Authentication(); ]]> <mx:TabNavigator id="viewstack2" selectedIndex="0" creationPolicy="all" width="100%" height="100%"> <mx:Form label="Login Form" id="loginform"> <mx:FormItem label="Mobile NO:"> <mx:TextInput id="mobileno"/> </mx:FormItem> <mx:FormItem label="Password:"> <mx:TextInput displayAsPassword="true" id="password" /> </mx:FormItem> <mx:FormItem> <mx:Button label="Login" click="user.authentication()"/> </mx:FormItem> </mx:Form> <mx:Form label="Child List"> <mx:Label width="100%" color="blue" text="Select Child."/> </mx:Form> <mx:Form label="Child Information"> </mx:Form> <mx:Form label="Bus Location"> </mx:Form> <mx:Form label="Bus path"> </mx:Form> </mx:TabNavigator> </mx:Panel>

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  • Autofac Unit Testing using RegisterControllers()

    - by Kane
    I am having problems using Autofac 2.1.13 and writing my unit tests for my ASP.NET MV2 application. I can't seem to resolve controllers when using the RegisterControllers method. I have tried using the Resolve<() and ControllerBuilder.Current.GetControllerFactory().CreateController() methods but to no avail. I am sure that I've missed something simple here so can anyone assist? This was my first attempt at resolving the HomeController - but does not work. ContainerBuilder builder = new ContainerBuilder(); builder.RegisterControllers(typeof(HomeController).Assembly); IContainer container = builder.Build(); // Throws a Throws a A first chance exception of type 'Autofac.Core.Registration.ComponentNotRegisteredException' occurred in Autofac.dll var homeController = container.Resolve<HomeController>(); Similarly this does not work either. ContainerBuilder builder = new ContainerBuilder(); builder.RegisterControllers(typeof(HomeController).Assembly); IContainer container = builder.Build(); var containerProvider = new ContainerProvider(container); ControllerBuilder.Current.SetControllerFactory(new AutofacControllerFactory(containerProvider)); var request = new Mock<HttpRequestBase>(MockBehavior.Loose); request.Setup(r => r.Path).Returns("Path"); var httpContext = new Mock<HttpContextBase>(MockBehavior.Loose); httpContext.SetupGet(c => c.Request).Returns(request.Object); ControllerBuilder.Current.GetControllerFactory().CreateController(new RequestContext(httpContext.Object, new RouteData()), "home"); Any assistance would be greatly appreciated. I should note if I register my controllers without using the RegisterControllers() method my unit tests work. My question would seem to be limited to specifically using the RegisterControllers() method.

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  • Custom Event - invokation list implementation considerations

    - by M.A. Hanin
    I'm looking for some pointers on implementing Custom Events in VB.NET (Visual Studio 2008, .NET 3.5). I know that "regular" (non-custom) Events are actually Delegates, so I was thinking of using Delegates when implementing a Custom Event. On the other hand, Andrew Troelsen's "Pro VB 2008 and the .NET 3.5 Platform" book uses Collection types in all his Custom Events examples, and Microsoft's sample codes match that line of thought. So my question is: what considerations should I have when choosing one design over the other? What are the pros and cons for each design? Which of these resembles the inner-implementation of "regular" events? Below is a sample code demonstrating the two designs. Public Class SomeClass Private _SomeEventListeners As EventHandler Public Custom Event SomeEvent As EventHandler AddHandler(ByVal value As EventHandler) _SomeEventListeners = [Delegate].Combine(_SomeEventListeners, value) End AddHandler RemoveHandler(ByVal value As EventHandler) _SomeEventListeners = [Delegate].Remove(_SomeEventListeners, value) End RemoveHandler RaiseEvent(ByVal sender As Object, ByVal e As System.EventArgs) _SomeEventListeners.Invoke(sender, e) End RaiseEvent End Event Private _OtherEventListeners As New List(Of EventHandler) Public Custom Event OtherEvent As EventHandler AddHandler(ByVal value As EventHandler) _OtherEventListeners.Add(value) End AddHandler RemoveHandler(ByVal value As EventHandler) _OtherEventListeners.Remove(value) End RemoveHandler RaiseEvent(ByVal sender As Object, ByVal e As System.EventArgs) For Each handler In _OtherEventListeners handler(sender, e) Next End RaiseEvent End Event End Class

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  • UITableView performance difference between Iphone 3G and 3GS ?

    - by gotye
    Hey guys, I managed to put my new app on an adhoc distribution but I just noticed that I only have 3GS's ... It is working quite good on the 3GS (could be a bit faster but that's fine) ... but do you think I should test it on the 3G ? I know there has been a lot of improvements between 3G and 3GS but would that infer on my uitableview performance ? Thanks, Gotye.

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  • How to JOIN a COUNT from a table, and then effect that COUNT with another JOIN

    - by jakenoble
    Hi I have three tables Post ID Name 1 'Something' 2 'Something else' 3 'One more' Comment ID PostId ProfileID Comment 1 1 1 'Hi my name is' 2 2 2 'I like cakes' 3 3 3 'I hate cakes' Profile ID Approved 1 1 2 0 3 1 I want to count the comments for a post where the profile for the comment is approved I can select the data from Post and then join a count from Comment fine. But this count should be dependent on if the Profile is approved or not. The results I am expecting is CommentCount PostId Count 1 1 2 0 3 1 Thanks for any help.

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  • How to open a new browser window AND run Javascript through a single user interaction?

    - by Gj
    Hi I have an HTML page with a simple form. When the user clicks "submit", I'd like a new window to open with the processed results of the form, AND to have the original page redirect somewhere else. If I use a link with target="_blank", I can open the results window but not redirect the original page. If I use Javascript to try and open the new window and then redirect the current page, the opening of the new window gets blocked (at least by my Firefox's default popup blocker). Is there any way to get both a new window and run some Javascript in the original page? Thanks!

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  • Writing text on icon of Menu in Android?

    - by sunil
    Hi, Can we set Title for a Menu Item in Android if it has an icon from drawable? I have a icon for a Menu Item and if I set the icon then the title that is set for that Menu item is not visible. Is this possible or not? Hope to get a reply soon. Regards Sunil

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  • Can't update contact details in android using code

    - by masterkapu
    I'm trying to update/change contact ringtone using this code: ContentValues values = new ContentValues(); values.put(ContactsContract.Data.CUSTOM_RINGTONE, "D:/TempDownloads/BurpSounds/Alex.wav"); getContentResolver().update(ContactsContract.Contacts.CONTENT_URI, values , "DISPLAY_NAME = 'Ani'", null); I get the message: " the application has stopped unexpectedly" what is wrong with my code and how do I do it? thanks

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  • Zend Framework Handle One to Many

    - by user192344
    I have 2 tables "user", "contact", the relation between two tables is one user has many contact Table member m_id name ------------ Table Contact c_id c_m_id value in zend model class, i do it in this way /* Member.php */ class Default_Model_DbTable_Member extends Zend_Db_Table_Abstract { protected $_name = 'member'; protected $_dependentTables = array('Default_Model_DbTable_Contact'); } /* Contact.php */ class Default_Model_DbTable_Contact extends Zend_Db_Table_Abstract { protected $_name = 'contact'; protected $_referenceMap = array( 'Member' => array( 'columns'=> array('c_id'), 'refTableClass'=> 'Default_Model_DbTable_Member', 'refColumns'=> array('c_m_id') ) ); /* IndexController.php */ class IndexController extends Zend_Controller_Action { public function indexAction() { $m= new Default_Model_DbTable_Member(); $row = $m->find(1); $data = $row->current(); $data = $data->findDependentRowset('Default_Model_DbTable_Contact'); print_r($data->toArray()); } } But i just get Invalid parameter number: no parameters were bound , my goal is to search a member detail record, and it also contains a array which store all contact info (i can use join method to do that, but i just want to try zend feature)

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  • Example with Visitor Pattern

    - by devoured elysium
    public class Song { public string Genre { get; protected set; } public string Name { get; protected set; } public string Band { get; protected set; } public Song(string name, string band, string genre) { Name = name; Genre = genre; Band = band; } } public interface IMusicVisistor { void Visit(List<Song> items); } public class MusicLibrary { List<Song> _songs = new List<Song> { ...songs ... }; public void Accept(IMusicVisitor visitor) { visitor.Visit(_songs); } } and now here's one Visitor I made: public class RockMusicVisitor : IMusicVisitor { public List<Song> Songs { get; protected set; } public void Visit(List<Song> items) { Songs = items.Where(x => x.Genre == "Rock").ToList(); } } Why is this any better than just putting a public property Songs and then letting any kind of class do with it anything that it wants to? This example comes from this post.

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  • Two Key HashSet?

    - by athena
    I need a HashSet implementation where the elements are a pair of Integers eg. Set s = { {1,2} , {3,4} , {1,4}}. Here the set s has 3 elements. This kind of two key HashSet is needed in many situations like, I have a relation in my database where the candidate key is a combination of two columns. Is there some library which already provides this? If no such implementation is available, then rather then implementing the entire data structure from scratch, will it be easier (and efficient?) to extend the HashSet implementation in Java?

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  • Identifying all types with some attribute

    - by Tom W
    Hello SO; I have an issue with .Net reflection. The concept is fairly new to me and I'm exploring it with some test cases to see what works and what doesn't. I'm constructing an example wherein I populate a set of menus dynamically by scanning through my Types' attributes. Basically, I want to find every type in my main namespace that declares 'SomeAttribute' (doesn't matter what it is, it doesn't have any members at present). What I've done is: For Each itemtype As Type In Reflection.Assembly.GetExecutingAssembly().GetTypes If itemtype.IsDefined(Type.GetType("SomeAttribute"), False) Then 'do something with the type End If Next This crashes the application on startup - the first type it identifies is MyApplication which is fairly obviously not what I want. Is there a right and proper way to look for all the 'real' 'sensible' types - i.e. classes that I've defined - within the current assembly?

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  • SSRS Email Subscription

    - by Lijo
    Hi Team, I have an report to be sent in email using SSRS 2005. I have created subscription through C# code, some time back. It used to send emails successfully. Now, it does not send. There is a message as "The delivery extension for this subscription could not be loaded." [The report is rendering properly when I try with Report Manager.] What all are the possible reasons for this? Please help... Thanks Lijo

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  • Uninstall Mono from Mac OS X v10.5 Leopard

    - by Mac
    I installed Mono on my iMac last night and I immidiately had a change of heart! I don't think Mono is ready for prime time. The Mono website says to run the following script to uninstall: #!/bin/sh -x #This script removes Mono from an OS X System. It must be run as root rm -r /Library/Frameworks/Mono.framework rm -r /Library/Receipts/MonoFramework-SVN.pkg cd /usr/bin for i in `ls -al | grep Mono | awk '{print $9}'`; do rm ${i} done Has anyone had to uninstall Mono? Was it as straight forward as running the above script or do I have to do more? How messy was it? Any pointers are appreciated. Thanks

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  • aspx page which isn't rendering.

    - by sunglim
    Hello. I Need to make a webpage. asp.net this webpage recieve parameter by using Request.Querystring and Redirect webpage. in this page, no need to render. what should I write code in .aspx file? does this aspx file need html tag? or only <%@ Page %> need to be coded? <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TargetMarketingRedirect.aspx.cs" Inherits="Arche.Buy.Event.TargetMarketingRedirect" %

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  • Jquery FancyBox target specific DIV ID?

    - by MrThomas
    How do I get Fancy box to target a specific DIV ID on a page and not request the whole page in the fancybox.? This my code so fare $(function() { $(".style_image a").live('click', function(event) { $(".style_image a").find("#show_style").fancybox(); }); }); This don't work? I originally tried the following: $(function() { $(".style_image a").live('click', function(event) { $(this.href + " #show_style").fancybox(); }); }); Not sure how this done, or if it is even possible? here are the doc's

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  • flex tabnavigator skin flicker

    - by Proyb2
    I am try to skin my tabnavigator with PNG, and extend with TabSkin.as and SelectedTabSkin.as, however, when I tried to mouseover, it will caused a flicker into black and load the tab image which I define. What can I do to avoid flicker? TabSkin.as same as SelectedTabSkin.as but different image package { import mx.controls.Image; public class TabSkin extends Image { public function TabSkin():void { super(); } override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void { super.updateDisplayList(unscaledWidth, unscaledHeight); } } } Tab.MXML TabNavigator { tabHeight: 39; tab-width: 108; tabOffset: 1; tabStyleName: "tab"; } .tab { fillColors: #000000, #000000; up-skin: ClassReference("TabSkin"); down-skin: ClassReference("TabSkin"); over-skin: ClassReference("TabSkin"); selected-up-skin: ClassReference("SelectedTabSkin"); selected-down-skin: ClassReference("SelectedTabSkin"); selected-over-skin: ClassReference("SelectedTabSkin"); } .selectedTab { font-weight: bold; corner-radius: 0; } <mx:TabNavigator x="223" y="82" width="100%" height="100%" id="tab2"/>

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  • How do you manage tasks within your work?

    - by Michael
    Just wondering how you all manage your workload effectively when there's a lot of your plate? What do you do to break it down into bite-size chunks and how do you track progress of each task? Do you find TDD helps to focus your attention of getting areas of functionality complete before moving onto the next one? I quite often find myself getting a bit overwhelmed when I have an involving task on the go (even if it can be broken down into lots of small chunks), even though I know I'm more than capable of doing the work. We have a kind of agile approach Interested to hear how everyone manages things effectively.

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  • ASP.NET MVC - Find Absolute Path to the App_Data folder from Controller

    - by tyndall
    What is the correct way to find the absolute path to the App_Data folder from a Controller in an ASP.NET MVC project? I'd like to be able to temporarily work with an .xml file and I don't want to hardcode the path. This does not work: [HandleError] public class HomeController : Controller { public ActionResult Index() { string path = VirtualPathUtility.ToAbsolute("~/App_Data/somedata.xml"); //.... do whatever return View(); } } I think outside of the web context VirtualPathUtility.ToAbsolute() doesn't work. string path comes back as "C:\App_Data\somedata.xml" Where should I determine the path of the .xml file in an MVC app? global.asax and stick it an application-level variable?

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