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  • C++ function-pointer and inheritance

    - by pingvinus
    In parent class I have function, that operates under an array of functions, declared in child-class, number of functions for every child-class may vary. But since every function uses some object-variables, I can't declare them as static. I've try to do something like this: class A { public: typedef int (A::*func)(); func * fs; void f() { /*call functions from this->fs*/ } }; class B : public A { public: int smth; B(int smth) { this->smth = smth; this->fs = new func[1]; fs[0] = &B::f; } int f() { return smth + 1; } }; But, obviously it doesn't work. Any suggestions?

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  • Clean way in GWT/Java to wait for multiple asynchronous events to finish

    - by gerdemb
    What is the best way to wait for multiple asynchronous callback functions to finish in Java before continuing. Specifically I'm using GWT with AsyncCallback, but I think this is a generic problem. Here's what I have now, but surely there is cleaner way... AjaxLoader.loadApi("books", "0", new Runnable(){ public void run() { bookAPIAvailable = true; ready(); }}, null); AjaxLoader.loadApi("search", "1", new Runnable(){ public void run() { searchAPIAvailable = true; ready(); }}, null); loginService.login(GWT.getHostPageBaseURL(), new AsyncCallback<LoginInfo>() { public void onSuccess(LoginInfo result) { appLoaded = true; ready(); } }); private void ready() { if(bookAPIAvailable && searchAPIAvailable && appLoaded) { // Everything loaded } }

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  • Receive messages for derived types in MVVMLight

    - by Hrvoje
    Shouldn't this test pass: [TestMethod] public void derived_message_subscription() { bool handled = false; Messenger.Default.Register<GenericMessage<baseClass>>(this, true, (msg) => handled = true); Messenger.Default.Send(new GenericMessage<testClass>(new testClass())); Assert.IsTrue(handled); } public abstract class baseClass { } public class testClass : baseClass { } I have to receive all messages for classes that inherits from one base class. MVVMLight has bool property receiveDerivedMessagesToo in Register method, but it seems to me that it isn't working.

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  • MySQL : select/join on strings as fieldnames - is this possible?

    - by Dylan
    I can retrieve all column names from table 'categories' with : SELECT col.column_name FROM information_schema.columns AS col WHERE col.table_schema= database() and col.table_name = "categories" This produces a resultset like this : column_name ----------------- categoryID name description I can retrieve all values for a specific category with : SELECT * FROM categories AS c WHERE c.categoryID=12345 this results in a resultset like this: categoryID | name | description ------------------------------------------------ 12345 | test | this is a test Now I would like to get some kind of join of above selects to get a resultset that looks something like this : fieldname | value ---------------------------------------- categoryID | 12345 name | test description | this is a test Does anyone know if this is possible ? Can you do a join on strings that come from another select ?? The reason for this is that I'm writing a universal stored procedure that outputs all fields + their values from a table, without knowing what fields there are in the table. (The tablename is given in a parameter)

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  • Listbox that when you reach the end it goes back to the beginning

    - by Roy
    Hi, Is there a way to make a Listbox go back to the beginning of the list once a user scrolls all the way to the end of list? Current aspx code: <ListBox x:Name="listbox"> <ListBox.ItemTemplate> <DataTemplate> <Image Name="imgSource" Source="{Binding Path=Url}" /> </DataTemplate> </ListBox.ItemTemplate> </ListBox> Current code behind code: public class ImageScroller { public string Url { get; set; } } public MainPage() { InitializeComponent(); LoadImages(); } void LoadImages() { listbox.ItemsSource = new List<ImageScroller> { new ImageScroller { Url = "images/Chrysanthemum.jpg" }, new ImageScroller { Url = "images/Desert.jpg" }, new ImageScroller { Url = "images/Hydrangeas.jpg" }, }; } Thanks for your help!

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  • Is there a JUnit equivalent to NUnit's testcase attribute?

    - by Steph
    I've googled for JUnit test case, and it comes up with something that looks a lot more complicated to implement - where you have to create a new class that extends test case which you then call: public class MathTest extends TestCase { protected double fValue1; protected double fValue2; protected void setUp() { fValue1= 2.0; fValue2= 3.0; } } public void testAdd() { double result= fValue1 + fValue2; assertTrue(result == 5.0); } but what I want is something really simple, like the NUnit test cases [TestCase(1,2)] [TestCase(3,4)] public void testAdd(int fValue1, int fValue2) { double result= fValue1 + fValue2; assertIsTrue(result == 5.0); } Is there any way to do this in JUnit?

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  • Sphinx: change column set for searching in runtime

    - by Fedyashev Nikita
    I use Ultrasphinx gem plugin as a wrapper for accessing Sphinx search daemon. My model declaration: class Foo < ActiveRecord::Base is_indexed :fields => ['content', 'private_notes', 'user_id'] Client code: filters = {} if type == "private" # search only in `content` column filters['user_id'] = current_user.id else # search in `content` and `private_notes` columns end results = Ultrasphinx::Search.new(:query => params[:query], :per_page => 20, :page => params[:page] || 1, :filters => filters) The problem I have now with Ultrasphinx gem(or Sphinx, in general?) is that it does not allow me to change set of fields where to look for matches IN RUNTIME How can I solve this problem?

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  • Best way to handle MySQL date for performance with thousands of users

    - by bitLost
    I am currently part of a team designing a site that will potentially have thousands of users who will be doing a number of date related searches. During the design phase we have been trying to determine which makes more sense for performance optimization. Should we store the datetime field as a mysql datetime. Or should be break it up into a number of fields (year, month, day, hour, minute, ...) The question is with a large data set and a potentially large set of users, would we gain performance wise breaking the datetime into multiple fields and saving on relying on mysql date functions? Or is mysql already optimized for this?

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  • Remove Validation in ASP.NET MVC 3

    - by johndoe
    I am trying to get remote validation working in ASP.NET MVC 3 but for some reason the validation never gets fired. I am returning json from the controller and in FireFox it ask me to download the files. Not sure what is going on here. Here is my code: @using(Html.BeginForm(new {Action = "ValidateUserName"})) { <text> Enter UserName: </text> @Html.TextBoxFor(x => x.UserName) <input type="submit" value="Login" /> } Here is the RegistrationViewModel: public class RegistrationViewModel { [Required(ErrorMessage = "UserName is required!")] [Remote("ValidateUserName","Home",ErrorMessage ="UserName already taken!")] public string UserName { get; set; } } And here is the HomeController: public ActionResult ValidateUserName(RegistrationViewModel registrationViewModel) { return Json(!registrationViewModel.UserName.Equals("test"),JsonRequestBehavior.AllowGet); }

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  • searching within a compressed sorted fixed width file

    - by user275455
    Assume I have a regular compressed fixed width file that is sorted on one of the fields. Given that I know the length of the records, I can use lseek to implement a binary search to records with fields that match a given value without having to read the entire file. Now the difficulty is that the file is gzipped. Is it possible to do this without completely inflating the file? If not with gzip. is there any compression that supports this kind of behavior?

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  • Structuremap and creating objects with initial state

    - by Simon
    I have an object which needs a dependency injected into it public class FootballLadder { public FootballLadder(IMatchRepository matchRepository, int round) { // set initial state this.matchRepo = matchRepository; this.round = round; } public IEnumerable<LadderEntry> GetLadderEntries() { // calculate the ladder based on matches retrieved from the match repository // return the calculated ladder } private IMatchRepository matchRepo; private int round; } For arguments sake, lets assume that I can't pass the round parameter into the GetLadderEntries call itself. Using StructureMap, how can I inject the dependency on the IMatchRepository and set the initial state? Or is this one of those cases where struggling against the framework is a sign the code should be refactored?

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  • Add UserControl To Page From Another Class

    - by Raika
    I have page and call method inside my page. I want to add some control to my page Control (not page itself) inside that method. namespace Program { public partail class Default : Page { protected void Page_Load(object sender, Eventargs e) { MyClass.Calling(this); } } } in another class namespace Program { public class MyClass { public static void Calling(Page page) { Textbox txt = new Textbox() // I want somthing like this. // page.PlaceHolder1.Controls.Add(txt); } } } Is this possible? My Default.aspx : <%@ Page Title="Home Page" MasterPageFile="~/Site.master" ... %> <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder> </asp:Content> Update: thanks to The King for help. his suggest work correctly if control is inside page not Content of master page like my defualt sample code.

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  • Why isn't the @Deprecated annotation triggering a compiler warning about a method?

    - by Scooter
    I am trying to use the @Deprecated annotation. The @Deprecated documentation says that: "Compilers warn when a deprecated program element is used or overridden in non-deprecated code". I would think this should trigger it, but it did not. javac version 1.7.0_09 and compiled using and not using -Xlint and -deprecation. public class test_annotations { public static void main(String[] args) { test_annotations theApp = new test_annotations(); theApp.this_is_deprecated(); } @Deprecated public void this_is_deprecated() { System.out.println("doing it the old way"); } }

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  • nhibernate3 weaknesses

    - by Adrakadabra
    from the moment we've migrated from hibernate 2 to hibernate3 ,around 30% of queries can not execute anymore,while there were not any problem with the previous version. does anybody have such problems? for example some of errors we see r like these Specified cast is not valid: Repository<CountrySubdivision>.Find(p => p.Parent.Id == parentId); specified method is not supported: public JsonResult AllEducationDegree(string search) { var data = Repository<EducationDegree> .FindBySpecification(new EducationDegreeSpecification().Search(search)) .Take(10) .Select(p => new NameValue(p.Title, (int)p.Id)) .ToList(); // .AsDropdown(" "); return Json(data, JsonRequestBehavior.AllowGet); } public class EducationDegreeSpecification : FluentSpecification<EducationDegree> { public EducationDegreeSpecification Search(string EducationDegreeSearch) { if (!String.IsNullOrEmpty(EducationDegreeSearch)) { string[] searchs = EducationDegreeSearch.Split(' '); foreach (string search in searchs) { if (!String.IsNullOrEmpty(search)) { AddExpression(p => p.Title.Contains(search)); } } } return this; } }

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  • Flex custom toggleswitch not working in actionscript

    - by Gavin Jones
    I have a custom Flex Toggleswitch component that changes the text values of the switch. package skins { import spark.skins.mobile.ToggleSwitchSkin; public class MyToggleSwitchSkin extends ToggleSwitchSkin { public function MyToggleSwitchSkin() { super(); selectedLabel="Serviceable"; unselectedLabel="Fault"; } } } If I add the control using the MXML tag, it works fine. However, when I add the component using action script, it does not. import skins.MyToggleSwitchSkin; public function addToggle():void { var myCustomToggle:MyToggleSwitchSkin = new MyToggleSwitchSkin(); hgroup.addElement(myCustomToggle); } The control dsiplays but will not activate. Any ideas what I have missed?

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  • What am i doing wrong with this in asp.net-mvc?

    - by Pandiya Chendur
    I gave this in my site.master <li><%= Html.ActionLink("Material", "Index", "Material")%></li> But my link doesnt seem to get my material controller Index method... I have this in my global asax file, public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default", "{controller}/{action}/{id}", new { controller = "Home", action = "Index", id = "" } ); routes.MapRoute( "Default", "{controller}/{action}/{id}", new { controller = "Material", action = "Index", id = "" } ); } My controller: public class MaterialController : Controller { // // GET: /Material/ Material material = new Material(); public ActionResult Index() { var materials = material.FindAllMaterials(); return View(); } } What am i doing wrong.... When i click the link i get The resource cannot be found. error.. Any suggestion...

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  • How can I redirect the stdout of ironpython in C#?

    - by Begtostudy
    public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button3_Click(object sender, EventArgs e) { try { var strExpression = @" import sys sys.stdout=my.write print 'ABC' "; var engine = Python.CreateEngine(); var scope = engine.CreateScope(); var sourceCode = engine.CreateScriptSourceFromString(strExpression); scope.SetVariable("my", this); var actual = sourceCode.Execute(scope); textBox1.Text += actual; } catch (System.Exception ex) { MessageBox.Show(ex.ToString()); } } public void write(string s) { textBox1.Text += s; } }<code> But Exception says there is not write. Where is wrong? Thanks!

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  • Why wasn't C# designed with 'const' for variables and methods?

    - by spoulson
    I suspect const was simplified for the C# spec for general language simplicity. Was there a specific reason we can't declare variable references or methods as const like we can with C++? e.g.: const MyObject o = new MyObject(); // Want const cast referenece of MyObject o.SomeMethod(); // Theoretically legal because SomeMethod is const o.ChangeStuff(); // Theoretically illegal because ChangeStuff is not const class MyObject { public int val = 0; public void SomeMethod() const { // Do stuff, but can't mutate due to const declaration. } public void ChangeStuff() { // Code mutates this instance. Can't call with const reference. val++; } }

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  • Pattern for database-wrapper in java

    - by Space_C0wb0y
    I am currently writing a java-class that wraps an SQLite database. This class has two ways to be instantiated: Open an existing database. Create a new database. This is what I cam up with: public class SQLiteDatabaseWrapper { public static SQLiteDatabaseWrapper openExisting(File PathToDB) { return new SQLiteDatabaseWrapper(PathToDB); } public static SQLiteDatabaseWrapper createNew(File PathToDB) { CreateAndInitializeNewDatabase(PathToDB); return new SQLiteDatabaseWrapper(PathToDB); } private SQLiteDatabaseWrapper(File PathToDB) { // Open connection and setup wrapper } } Is this the way to go in Java, or is there any other best practice for this situation?

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  • Copy Paste is Disabled in Property Grid

    - by ofarooq
    Hi All, I have a FileNameEditor inside a property grid, which has a few entries like Main File : "C:\blah1" Sec File: "C:\blah2" and so on. My problem is that I cannot copy and paste from one property entry to another, and I cannot type in the fields manually as well. Is there a specific property that will enable editing inside the FileNameEditor. Example public class MyEditor : FileNameEditor { public override bool GetPaintValueSupported(ITypeDescriptorContext context) { return false; } public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { object e = base.EditValue(context, provider, value); if ((value as MyFileS) != null) { (value as MyFilesS).FileName = (String) e; } return e; } protected override void InitializeDialog(OpenFileDialog openFileDialog) { base.InitializeDialog(openFileDialog); } } Thanks

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  • Casting objects to Integer,string ,...

    - by Milan
    Hello everybody! I have one small problem. I have list of types(int,string,..) ArrayList<Class> typeList; and I have some input values; ArrayList<Object> values; How to cast some value to some type if I know which type from the typeList is the values; typeList.get(i).cast(values.get(i)); <- this is not working??? Actualy I generate dynamic form in runtime. With Java reflection I get parameterTypes from methods from some class, I generate form with input fields and then i want to cast the text from the input fields to specific types from the paramterTypes that I got with Java reflection from some class.

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  • Whats wrong with the following code, its not compiling

    - by Ganesh Kundapur
    #include <iostream> #include <vector> using namespace std; class Base { public: void Display( void ) { cout<<"Base display"<<endl; } int Display( int a ) { cout<<"Base int display"<<endl; return 0; } }; class Derived : public Base { public: void Display( void ) { cout<<"Derived display"<<endl; } }; void main() { Derived obj; obj.Display(); obj.Display( 10 ); } $test1.cpp: In function ‘int main()’: test1.cpp:35: error: no matching function for call to ‘Derived::Display(int)’ test1.cpp:24: note: candidates are: void Derived::Display() On commenting obj.Display(10), it works.

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  • php foreach looping twice

    - by Jack
    Hi, I am trying to loop through some data from my database but it is outputting it twice. $fields = 'field1, field2, field3, field4'; $idFields = 'id_field1, id_field2, id_field3, id_field4'; $tables = 'table1, table2, table3, table4'; $table = explode(', ', $tables); $field = explode(', ', $fields); $id = explode(', ', $idFields); $str = 'Egg'; $i=1; while ($i<4) { $f = $field[$i]; $idd = $id[$i]; $sql = $writeConn->select()->from($table[$i], array($f, $idd))->where($f . " LIKE ?", '%' . $str . '%'); $string = '<a title="' . $str . '" href="' . $currentProductUrl . '">' . $str . '</a>'; $result = $writeConn->fetchAssoc($sql); foreach ($result as $row) { echo 'Success! Found ' . $str . ' in ' . $f . '. ID: ' . $row[$idd] . '.<br>'; } $i++; } Outputting: Success! Found Egg in field3. ID: 5. Success! Found Egg in field3. ID: 5. Could someone please explain why it is looping through both the indexed and associative values? UPDATE I did some more playing around and tried the following. $fields = 'field1, field2, field3, field4'; $idFields = 'id_field1, id_field2, id_field3, id_field4'; $tables = 'table1, table2, table3, table4'; $table = explode(', ', $tables); $field = explode(', ', $fields); $id = explode(', ', $idFields); $str = 'Egg'; $i=1; while ($i<4) { $f = $field[$i]; $idd = $id[$i]; $sql = $writeConn->select()->from($table[$i], array($f, $idd))->where($f . " LIKE ?", '%' . $str . '%'); $string = '<a title="' . $str . '" href="' . $currentProductUrl . '">' . $str . '</a>'; $sth = $writeConn->prepare($sql); $sth->execute(); $result = $sth->fetch(PDO::FETCH_ASSOC); foreach ($result as $row) { echo 'Success! Found ' . $str . ' in ' . $f . '. ID: ' . $row[$idd] . '.<br>'; } $i++; } The interesting thing is that this outputs the below: Success! Found Egg in field3. ID: E. Success! Found Egg in field3. ID: E. Success! Found Egg in field3. ID: 5. Success! Found Egg in field3. ID: 5. Success! Found Egg in field3. ID: E. Success! Found Egg in field3. ID: E. Success! Found Egg in field3. ID: 5. Success! Found Egg in field3. ID: 5. I have also tried adding $i to the output and this outputs 2 as expected. If I change fetch(PDO::FETCH_BOTH) to fetch(PDO::FETCH_ASSOC) the output is as follows: Success! Found Egg in field3. ID: E. Success! Found Egg in field3. ID: E. Success! Found Egg in field3. ID: 5. Success! Found Egg in field3. ID: 5. This has been bugging me for too long, so if anyone could help I would be very appreciative!

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  • Get Item from Collection by unique ID

    - by David Murdoch
    I have a collection of Contacts that inherits from CollectionBase: public class ContactCollection : CollectionBase{ //... } each contact in the collection has a unique ID: public class Contact{ public int ContactID{ get; private set; } //... } I think what I would like to do is something like the following: // get the contact by their unique [Contact]ID Contact myPerson = Contact.GetContactById(15); // get all contacts for the customer ContactCollection contacts = customer.GetContacts(); // replaces the contact in the collection with the // myPerson contact with the same ContactID. contacts.ReplaceAt(myPerson); // saves the changes to the contacts and the customer // customer.Save(); There is probably a better way...if so, please suggest it.

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  • How to set the ReturnUrl for the Login link in MVC 3 app?

    - by user762196
    using System; using Microsoft.Practices.Unity; namespace <MyNameSpace> { public class UrlFactory { public static UrlFactory Current { get { return HttpApplicationUnityContext.Current.Resolve<UrlFactory>(); } } public string GetLoginUrl() { return String.Format("{0}/login?ReturnUrl={1}", MyConfig.BaseHttpUrl, <GET_PAGE_URL>); } } The user can be on any page on the site and click the Login link. But the ReturnUrl must always point to the exact page where he clicked it. I must take the user back to the page he clicked the login link. In my code above, how do I get the page url in <GET_PAGE_URL>? Thanks

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