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  • How should objects be in a Java game.

    - by Gabriel A. Zorrilla
    EDIT: i just deleted the entire post and reformulated the question to be more generic. I want to do a simple strategy game: map, units. Map: one class. Units: another class, self drawn. Simple questions: How does an unit should redraw itself on the map. A unit should be a JPanel or similar Swing component (just to be able to manage them as an entity with its own mousehandlers) or can be another thing, without neglecting the fact that it should be an autonomous object with its own action handlers and fields. Is this map-units model correct of a simple game that would help me to learn in a fun way Java and OOP fundamentals. Thats it!

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  • Equivalent of Bloch's Effective Java for C#

    - by Elliot Vargas
    I've jumped into the C# bandwagon and was wondering if there's an equivalent of Joshua Bloch's Effective Java for the C# world. I've already being able to apply some Java knowledge to C# given their similarity but I'm interested in knowledge to make the most effective use of C# specific features. For example, Generics are not implemented equally in Java and C#, so it's not clear to me if the Java Generic "techniques" will work in C# as well. I'm mostly interested in C# 3.0. That is (of course) unless you guys think I would benefit for looking into versions 1 and 2 features.

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  • LINQ how to concatenate 2 db columns to display in dropdownlist

    - by Simke Nys
    I'm trying to concatenate product_name with product_prize_kg by using LINQ so I can display it as one field in a dropdownlist. When I try to do this I get the following error. value of type 'system.collections.generic.list(of anonymous type )' cannot be converted to ... My code is like this: Public Function selectAll() As List(Of tblProduct) Dim result = From product In dc.tblProducts Select New With { Key .productID = product.pk_product_id, Key .productNameKg = Convert.ToString(product.product_name) & " " & Convert.ToString(product.product_price_kg) } Return result.ToList() End Function This is the dropdownlist that I want to fill. <asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="ObjectDataSource1" DataTextField="productNameKg" DataValueField="productID"> </asp:DropDownList> Thanks Grtz Simke

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  • ASP.Net MVC 2 Error Method not found: 'System .string

    - by Saravanan I M
    I converted my website from asp.net mvc 1.0 to 2.0. After converting that i am getting the following error in actionlink Method not found: 'System.String System.Web.Mvc.Html.LinkExtensions.RouteLink(System.Web.Mvc.HtmlHelper, System.String, System.Web.Routing.RouteValueDictionary, System.Collections.Generic.IDictionary`2<System.String,System.Object>)'. Line 102: <%var Signin = Html.Resource("globalResources, Signin"); %> Line 103: <% if (string.IsNullOrEmpty(Signin)) Signin = "Signin"; %> Line 104: <%= Html.ActionLink<AccountController>(cntrl => cntrl.LogOn(), Signin.ToString(), new { @class = "defaultmaster" })%> Line 105: | Line 106: <%var register = Html.Resource("globalResources, Register"); %> Source File: e:\Muchsocial\Sourcecode\Muchsocial\Views\Shared\Muchsocial.Master Line: 104

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  • Best PHP framework for an experienced PHP developer?

    - by andybaird
    Okay, before I start this, I am well aware of how subjective this question is. For my case, I'd like to define the 'best' for me as: Rapid development "Pretty" URLs Data validation Good knowledge base available Not impossible to integrate other PHP software with This is a pretty generic definition, but all I'm looking for here is opinions. Edited: Here's a better way to ask this question: You have two weeks to create a full scale booking and scheduling system that accepts Google Checkout payments (via the API) and integrates with an open source message board software. Which framework do you choose and why?

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  • Don't want to JSON serialize the whole list of classes

    - by mjmcloug
    Hey, I've got a IList of Sites in my application and Site has a large amount of properties. I'm wanting to convert this list to JSON to be used in a dropdownlist similar to this var sites = SiteRepository.FindAllSites(); return new JsonResult() { Data = sites, JsonRequestBehavior = JsonRequestBehavior.AllowGet }; the problem I have is that I only want to use the id and name properties of the site class. I was thinking a way round this would be to use an 'adaptor' class that would then only expose these two properties and I would then serialize that. The problem I have is I want to make the class generic so that it can handle any list of objects. Has anybody come across a similar situation and solved it?

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  • Passing parametrized ArrayList to a function in java

    - by user150505
    I have the following fucntion. func(ArrayList <String> name) { ........ } The function fills the ArrayList. (I don't want to return the ArrayList) However, in the caller function the ArrayList obtained has all items of ArrayList as null. For eg. 1 name = new ArrayList[num]; 2 func(name); 3 System.out.println(name[0]); I get NullPointerException at line 3. Is this because of line 1, i.e. I am not parametrizing? If yes, is there another way this can be done? Because java does not allow creating a generic array of parametrized ArrayList.

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  • Interface "not marked with serializable attribute" exception

    - by Joel in Gö
    I have a very odd exception in my C# app: when trying to deserialize a class containing a generic List<IListMember> (where list entries are specified by an interface), an exception is thrown reporting that "the type ...IListMember is not marked with the serializable attribute" (phrasing may be slightly different, my VisualStudio is not in English). Now, interfaces cannot be Serializable; the class actually contained in the list, implementing IListMember, is [Serializable]; and yes, I have checked that IListMember is in fact defined as an interface and not accidentally as a class! I have tried reproducing the exception in a separate test project only containing the class containing the List and the members, but there it serializes and deserializes happily :/ Does anyone have any good ideas about what it could be?

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  • No persister for: <ClassName> issue with Fluent NHibernate

    - by Amit
    I have following code: //AutoMapConfig.cs using System; using FluentNHibernate.Automapping; namespace SimpleFNH.AutoMap { public class AutoMapConfig : DefaultAutomappingConfiguration { public override bool ShouldMap(Type type) { return type.Namespace == "Examples.FirstAutomappedProject.Entities"; } } } //CascadeConvention.cs using FluentNHibernate.Conventions; using FluentNHibernate.Conventions.Instances; namespace SimpleFNH.AutoMap { public class CascadeConvention : IReferenceConvention, IHasManyConvention, IHasManyToManyConvention { public void Apply(IManyToOneInstance instance) { instance.Cascade.All(); } public void Apply(IOneToManyCollectionInstance instance) { instance.Cascade.All(); } public void Apply(IManyToManyCollectionInstance instance) { instance.Cascade.All(); } } } //Item.cs namespace SimpleFNH.Entities { public class Item { public virtual long ID { get; set; } public virtual string ItemName { get; set; } public virtual string Description { get; set; } public virtual OrderItem OrderItem { get; set; } } } //OrderItem.cs namespace SimpleFNH.Entities { public class OrderItem { public virtual long ID { get; set; } public virtual int Quantity { get; set; } public virtual Item Item { get; set; } public virtual ProductOrder ProductOrder { get; set; } public virtual void AddItem(Item item) { item.OrderItem = this; } } } using System; using System.Collections.Generic; //ProductOrder.cs namespace SimpleFNH.Entities { public class ProductOrder { public virtual long ID { get; set; } public virtual DateTime OrderDate { get; set; } public virtual string CustomerName { get; set; } public virtual IList<OrderItem> OrderItems { get; set; } public ProductOrder() { OrderItems = new List<OrderItem>(); } public virtual void AddOrderItems(params OrderItem[] items) { foreach (var item in items) { OrderItems.Add(item); item.ProductOrder = this; } } } } //NHibernateRepo.cs using FluentNHibernate.Cfg; using FluentNHibernate.Cfg.Db; using NHibernate; using NHibernate.Criterion; using NHibernate.Tool.hbm2ddl; namespace SimpleFNH.Repository { public class NHibernateRepo { private static ISessionFactory _sessionFactory; private static ISessionFactory SessionFactory { get { if (_sessionFactory == null) InitializeSessionFactory(); return _sessionFactory; } } private static void InitializeSessionFactory() { _sessionFactory = Fluently.Configure().Database( MsSqlConfiguration.MsSql2008.ConnectionString( @"server=Amit-PC\SQLEXPRESS;database=SimpleFNH;Trusted_Connection=True;").ShowSql()). Mappings(m => m.FluentMappings.AddFromAssemblyOf<Order>()).ExposeConfiguration( cfg => new SchemaExport(cfg).Create(true, true)).BuildSessionFactory(); } public static ISession OpenSession() { return SessionFactory.OpenSession(); } } } //Program.cs using System; using System.Collections.Generic; using System.Linq; using SimpleFNH.Entities; using SimpleFNH.Repository; namespace SimpleFNH { class Program { static void Main(string[] args) { using (var session = NHibernateRepo.OpenSession()) { using (var transaction = session.BeginTransaction()) { var item1 = new Item { ItemName = "item 1", Description = "test 1" }; var item2 = new Item { ItemName = "item 2", Description = "test 2" }; var item3 = new Item { ItemName = "item 3", Description = "test 3" }; var orderItem1 = new OrderItem { Item = item1, Quantity = 2 }; var orderItem2 = new OrderItem { Item = item2, Quantity = 4 }; var orderItem3 = new OrderItem { Item = item3, Quantity = 5 }; var productOrder = new ProductOrder { CustomerName = "Amit", OrderDate = DateTime.Now, OrderItems = new List<OrderItem> { orderItem1, orderItem2, orderItem3 } }; productOrder.AddOrderItems(orderItem1, orderItem2, orderItem3); session.Save(productOrder); transaction.Commit(); } } using (var session = NHibernateRepo.OpenSession()) { // retreive all stores and display them using (session.BeginTransaction()) { var orders = session.CreateCriteria(typeof(ProductOrder)) .List<ProductOrder>(); foreach (var item in orders) { Console.WriteLine(item.OrderItems.First().Quantity); } } } } } } I tried many variations to get it working but i get an error saying No persister for: SimpleFNH.Entities.ProductOrder Can someone help me get it working? I wanted to create a simple program which will set a pattern for my bigger project but it is taking quite a lot of time than expected. It would be rally helpful if you can explain in simple terms on any template/pattern that i can use to get fluent nHibernate working. The above code uses auto mapping, which i tried after i tried with fluent mapping.

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  • Is google gson running on android?

    - by Janusz
    I'm playing arround with google gson for communication with my web back end at the moment. This and this older posts indicate that there are some problems with gson on android. I did some easy tests on the device already but maybe I just missed the bug. Edit I'm now parsing a lot more data. Generic lists etc. still not encountered the bug. Has anybody used gson on Android already? How does it work? Has somebody encountered bugs or something that will stop me from using it once it gets more complicated?

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  • mod_wsgi | linux installation error

    - by MMRUser
    I'm getting the following error when I try to install mod_wsgi ./configure checking for apxs2... no checking for apxs... /usr/sbin/apxs checking Apache version... 2.2.3 configure: creating ./config.status config.status: creating Makefile make /usr/sbin/apxs -c -I/usr/local/include/python2.6 -DNDEBUG mod_wsgi.c -L/usr/local/lib -L/usr/local/lib/python2.6/config -lpython2.6 -lpthread -ldl -lutil -lm /apr-1/build/libtool --silent --mode=compile gcc -prefer-pic -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -fno-strict-aliasing -DLINUX=2 -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -pthread -I/usr/include/httpd -I/usr/include/apr-1 -I/usr/include/apr-1 -I/usr/local/include/python2.6 -DNDEBUG -c -o mod_wsgi.lo mod_wsgi.c && touch mod_wsgi.slo sh: /apr-1/build/libtool: No such file or directory apxs:Error: Command failed with rc=8323072 . make: *** [mod_wsgi.la] Error 1 libtool is installed on my system.. mod_wsgi 3.2 *Apache 2.2* *Python 2.6*

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  • Does a recursive Ant task exist to recover properties from external file?

    - by Julia2020
    Hi, I ve got a problem in getting properties with ant from a properties file. With a simple target like this in my build.xml, i'd like to get at least two properties path1 and path2. I'd like to have a generic target to get this two properties.... in order to avoid modifying the build.xml (just adding a new prop) Any suggestions? Thanks in advance ! build.xml : <target name="TEST" description="test ant"> <property file="dependencies.properties"/> <svn> <export srcUrl="${path.prop}" destPath="${workspace}/rep/" /> </svn> </target> dependencies.properties : path1.prop = /path/to/src1 path2.prop = /path/to/src2

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  • Python: How do I create a reference to a reference?

    - by KCArpe
    Hi, I am traditionally a Perl and C++ programmer, so apologies in advance if I am misunderstanding something trivial about Python! I would like to create a reference to a reference. Huh? Ok. All objects in Python are actually references to the real object. So, how do I create a reference to this reference? Why do I need/want this? I am overriding sys.stdout and sys.stderr to create a logging library. I would like a (second-level) reference to sys.stdout. If I could create a reference to a reference, then I could create a generic logger class where the init function receives a reference to a file handle reference that will be overrided, e.g., sys.stdout or sys.stderr. Currently, I must hard-code both values. Cheers, Kevin

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  • Stream (.NET) handling best-practices

    - by Jader Dias
    The question is entitled with the word "Stream" because the question below is a concrete example of a more generic doubt I have about Streams: I have a problem that accepts two solutions and I want to know the best one: I download a file, save it to disk (2 min), read it and write the contents to the DB (+ 2 min). I download a file and write the contents directly to the DB (3 min). If the write to DB fails I'll have to download again in the second case, but not in the first case. Which is best? Which would you use?

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  • Best way to store sales tax information

    - by Seph
    When designing a stock management database system (sales / purchases) what would be the best way to store the various taxes and other such amounts? A few of the fields that could be saved are: Unit price excluding tax Unit price including tax Tax per item Total excluding tax (rounded to 2 decimals) Total including tax (rounded to 2 decimals) Total tax (rounded to 2 decimals) Currently the most reasonable solution so far is storing down (roughly) item, quantity, total excluding tax (rounded) and the total tax (rounded). Can anyone suggest some better way of storing this details for a generic system? Also, given the system needs to be robust, what should be done if there were multiple tax values (eg: state and city) which might need to be separated, in this case a separate table would be in order, but would it be considered excessive to just have a rowID and some taxID mapping to a totalTax column?

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  • is there a way to create an item template (t4) installer like the POCO generator?

    - by bryanjonker
    Subject says it all. I want to modify the POCO generation adapter (http://code.msdn.microsoft.com/EFPocoAdapter) to generate my own code. I have the .tt adapters done, but I want to be able to distribute this to coworkers, so they right-click on the model, choose "Generate Code", and my t4 templates appear in the options along with the other choices. Is there an easy way to do this? I found some articles at http://msdn.microsoft.com/en-us/library/tsyyf0yh(VS.80).aspx but it was focused on generic templates, and I'm looking for specifically model templates.

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  • Using hash functions with Bloom filters

    - by dangerstat
    Hi, A bloom filter uses a hash function (or many) to generate a value between 0 and m given an input string X. My question is how to you use a hash function to generate a value in this way, for example an MD5 hash is typically represented by a 32 length hex string, how would I use an MD5 hashing algorithm to generate a value between 0 and m where I can specify m? I'm using Java at the moment so an example of to do this with the MessageDigest functionality it offers would be great, though just a generic description of how to do about it would be fine too. Thanks

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  • Setting a VCProject property to default

    - by Ofek Shilon
    I'm trying some VS2005 IDE macros to modify a large amount of projects (~80) within a solution. Some of the properties I wish to set do expose a programmatic interface to 'default', but many others do not. Is there a generic way to set such properties to their default? (eventually meaning erasing them from the .vcproj file) Simplified example, setting some random properties: Sub SetSomeProps() Dim prj As VCProject Dim cfg As VCConfiguration Dim toolCompiler As VCCLCompilerTool Dim toolLinker As VCLinkerTool Dim EnvPrj As EnvDTE.Project For Each EnvPrj In DTE.Solution.Projects prj = EnvPrj.Object cfg = prj.Configurations.Item(1) toolLinker = cfg.Tools("VCLinkerTool") If toolLinker IsNot Nothing Then ' Some tool props that expose a *default* interface' toolLinker.EnableCOMDATFolding = optFoldingType.optFoldingDefault toolLinker.OptimizeReferences = optRefType.optReferencesDefault toolLinker.OptimizeForWindows98 = optWin98Type.optWin98Default End If toolCompiler = cfg.Tools("VCCLCompilerTool") If toolCompiler IsNot Nothing Then ' How to set it to default? (*erase* the property from the .vcproj)' toolCompiler.CallingConvention = callingConventionOption.callConventionCDecl toolCompiler.WholeProgramOptimization = False toolCompiler.Detect64BitPortabilityProblems = False End If Next End Sub Any advice would be appreciated.

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  • Accessing WPF Template for Custom Control from Code behind

    - by Ashwani Mehlem
    Hi, i am trying to access a named grid inside a default template for a custom control from code behind. But it seems that the template for the control is null, even after calling ApplyTemplate(). Is that impossible inside the controls constuctor? Here's the code: Generic.xaml: ... <ControlTemplate TargetType="{x:Type local:TimeTableControl}"> <Grid Name="ContentGrid"> </Grid> </ControlTemplate> ... TimeTableControl.cs: public TimeTableControl() { ApplyTemplate(); contentGrid = (Grid)(Template.FindName("ContentGrid", this)); //Line above causes null-pointer-exception ... }

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  • Reworking my singly linked list

    - by Stradigos
    Hello everyone, thanks for taking the time to stop by my question. Below you will find my working SLL, but I want to make more use of C# and, instead of having two classes, SLL and Node, I want to use Node's constructors to do all the work (To where if you pass a string through the node, the constructor will chop it up into char nodes). The problem is, after an a few hours of tinkering, I'm not really getting anywhere... using System; using System.Collections.Generic; using System.Text; using System.IO; namespace PalindromeTester { class Program { static void Main(string[] args) { SLL mySLL = new SLL(); mySLL.add('a'); mySLL.add('b'); mySLL.add('c'); mySLL.add('d'); mySLL.add('e'); mySLL.add('f'); Console.Out.WriteLine("Node count = " + mySLL.count); mySLL.reverse(); mySLL.traverse(); Console.Out.WriteLine("\n The header is: " + mySLL.gethead); Console.In.ReadLine(); } class Node { private char letter; private Node next; public Node() { next = null; } public Node(char c) { this.data = c; } public Node(string s) { } public char data { get { return letter; } set { letter = value; } } public Node nextNode { get { return next; } set { next = value; } } } class SLL { private Node head; private int totalNode; public SLL() { head = null; totalNode = 0; } public void add(char s) { if (head == null) { head = new Node(); head.data = s; } else { Node temp; temp = new Node(); temp.data = s; temp.nextNode = head; head = temp; } totalNode++; } public int count { get { return totalNode; } } public char gethead { get { return head.data; } } public void traverse() { Node temp = head; while(temp != null) { Console.Write(temp.data + " "); temp = temp.nextNode; } } public void reverse() { Node q = null; Node p = this.head; while(p!=null) { Node r=p; p=p.nextNode; r.nextNode=q; q=r; } this.head = q; } } } } Here's what I have so far in trying to work it into Node's constructors: using System; using System.Collections.Generic; using System.Text; using System.IO; namespace PalindromeTester { class Program { static void Main(string[] args) { //Node myList = new Node(); //TextReader tr = new StreamReader("data.txt"); //string line; //while ((line = tr.ReadLine()) != null) //{ // Console.WriteLine(line); //} //tr.Close(); Node myNode = new Node("hello"); Console.Out.WriteLine(myNode.count); myNode.reverse(); myNode.traverse(); // Console.Out.WriteLine(myNode.gethead); Console.In.ReadLine(); } class Node { private char letter; private Node next; private Node head; private int totalNode; public Node() { head = null; totalNode = 0; } public Node(char c) { if (head == null) { head = new Node(); head.data = c; } else { Node temp; temp = new Node(); temp.data = c; temp.nextNode = head; head = temp; } totalNode++; } public Node(string s) { foreach (char x in s) { new Node(x); } } public char data { get { return letter; } set { letter = value; } } public Node nextNode { get { return next; } set { next = value; } } public void reverse() { Node q = null; Node p = this.head; while (p != null) { Node r = p; p = p.nextNode; r.nextNode = q; q = r; } this.head = q; } public void traverse() { Node temp = head; while (temp != null) { Console.Write(temp.data + " "); temp = temp.nextNode; } } public int count { get { return totalNode; } } } } } Ideally, the only constructors and methods I would be left with are Node(), Node(char c), Node(string s), Node reserve() and I'll be reworking traverse into a ToString overload. Any suggestions?

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  • Track pageviews in Google Analytics on partial url of Grails application

    - by Pieter van Gent
    For my Grails application I want to set up Google Analytics to track only "partial" url's. I 'll explain: a typical Grails url consists of the following parts: domain + application-name + controller + action + id e.g. www.mydomain.com/myapp/controller/action/12345 As far as I understand for Google Analytics the page to be tracked is identified by the entire url. For my purpose I'm not interested in the id part of the url: I want to know which actions have been performed, but I need not know for which id the action was executed. And of course I would like a generic solution, because I have multiple controllers and multiple actions... Maybe some kind of filter stating "I want to track pages 3 levels deep (/myapp/controller/action)" would do? Or a filter stating "exclude everything from url after the last /"? Any help would be much appreciated. Kind regards, Pieter

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  • How to do a natural sort on an NSArray?

    - by Cory Imdieke
    I've got an array of objects, and I need them sorted by their "title" key. It's currently working, though it's using an ASCII sort instead of a natural sort. The titles are filenames, so they look like this: file1 file2 file3 ... file10 file11 file12 I'm getting, as you would expect: file1 file10 file11 file12 file2 file3 ... Does anyone know if there is a way built-in to the NSArray sorting functionality to get this natural sorting as opposed to the alphabetical sort? I found some generic algorithms, but I was hoping for something built-in...

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  • nested linq-to-sql queries

    - by ile
    var result = ( from contact in db.Contacts join user in db.Users on contact.CreatedByUserID equals user.UserID orderby contact.ContactID descending select new ContactListView { ContactID = contact.ContactID, FirstName = contact.FirstName, LastName = contact.LastName, Company = (from field in contact.XmlFields.Descendants("Company") select field.Value).SingleOrDefault().ToString() }).Take(10); Here I described how my database tables look like. So, contacts table has one field that is xml type. In that field is stored Company filename and I need to read it. I tried it using this way: Company = (from field in contact.XmlFields.Descendants("Company") select field.Value).SingleOrDefault().ToString() }).Take(10); but I get following error: Member access 'System.String Value' of 'System.Xml.Linq.XElement' not legal on type 'System.Collections.Generic.IEnumerable`1[System.Xml.Linq.XElement]. Any solution for this? Thanks in advance, Ile

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  • Testing complex entities

    - by Carlos
    I've got a C# form, with various controls on it. The form controls an ongoing process, and there are many, many aspects that need to be right for the program to run correctly. Each part can be unit tested (for instance, loading some coefficients, drawing some diagnostics) but I often run into problems that are best described with an example: "If I click here, then here, then change this, then re-open the form, then click here, it crashes or produces an error" I've tried my best to use common code organisational ideas (inheritance, DRY, separation of concerns) but there never seems to be a way to test every single path, and inevitably, a form with several controls will have a huge number of ways to execute. What can I read (preferably online) that addresses this kind of issue, and is there a (non-generic) term for it. This isn't a specific problem I'm having, but one that creeps up on me, especially with WinForms.

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  • Does MS Test provide a default value equals comparison?

    - by fearofawhackplanet
    I want to test for example int orderId = myRepository.SubmitOrder(orderA); orderB = myRepository.GetOrder(orderId); Assert.AreEqual(orderA, orderB); // fail Obviously I need a value comparison here, but I don't want to have to provide an overridden Equals implementation for all of my classes purely for the sake of testing (it wouldn't be of any use in the rest of the app). Is there a provided generic method that just checks every field using reflection? Or if not, it is possible to write my own?

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