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  • How to start coding the "Dining Philosophers" simulation?

    - by GrizzlyGuru
    I'm not a beginner at C# but I really need to increase my understanding, so I've picked a classic deadlock problem to code to help teach myself some of the more advanced concepts of C#. The Dining Philosophers Problem seems like a good one, but I need a little help to get started. I know I need to approach the "diners" as objects, but to simulate the random delays between eating, should I look to threading with each diner in a separate thread? Do I need some kind of "master" to monitor all the actions? Any general design concept advice is welcome, but I'd like to do the grunt programming as an exercise. Thanks!

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  • how to display "complex" widgets in a list in pyqt?

    - by Giorgio Gelardi
    I'm quite new to QT and I have to display a list of "panels" like this: My datamodel handles different classes' instances, so having more than one panel layout would be great - but it's not a requirement. Btw I have to catch mouse clicks on the images to execute related actions. I'm thinking about use some html capable widget (QWebPage?) to render the items in a QListView or QListWidget, but as I said, I don't know QTs so much and need a direction (delegates? stylesheets?). Any help will be appreciated.

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  • Where does the AccountController in Asp.Net MVC 2 store its data?

    - by JLago
    I'm creating a website using ASP.NET MVC 2 and I'm thinking of using the default AccountController and Views to take care of the Users. The only problem is that, for all the rest, I'm using a Postgres database. Is there a way to link The account controller to a User class defined by me? I'm using Nhibernate to connect to the database, so I'll have a User class with whatever fields necessary. Thanks very much.

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  • Android how do I wait until a service is actually connected?

    - by Ryan
    I have an Activity calling a Service defined in IDownloaderService.aidl: public class Downloader extends Activity { IDownloaderService downloader = null; // ... In Downloader.onCreate(Bundle) I tried to bindService Intent serviceIntent = new Intent(this, DownloaderService.class); if (bindService(serviceIntent, sc, BIND_AUTO_CREATE)) { // ... and within the ServiceConnection object sc I did this public void onServiceConnected(ComponentName name, IBinder service) { Log.w("XXX", "onServiceConnected"); downloader = IDownloaderService.Stub.asInterface(service); // ... By adding all kinds of Log.xx I found that the code after if(bindService(...)) actually goes BEFORE ServiceConnection.onServiceConnected is being called - that is, when downloader is still null - which gets me into trouble. All the samples in ApiDemos avoid this timing problem by only calling services when triggered by user actions. But what should I do to right use this service after bindService succeeds? How can I wait for ServiceConnection.onServiceConnected being called reliably?

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  • Rails: url_for to be available in a isolated class that must be instanced

    - by Totty
    Rails: url_for to be available in a isolated class that must be instanced: class ProfilePresenter < ActionController::Base attr_reader :profile def initialize(profile) super @a = url_for(:controller => 'profiles', :action => 'view', :profile_url => 'dd') @a @profile = profile end end How to make the url_for work? i tried to extend the ActionController::Base and the ActionView::Base and i cant :s

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  • How should I structure my iPhone OpenGL ES 1.1 game?

    - by Ryan
    I am building an iPhone OpenGL ES 1.1 game. I am using the OpenGL ES template provided by xcode. I am only using the ES1Renderer. I've coded some basic touch actions the user can take, and I've begun to think about the overall structure of the code. All I'm really doing is using C in the ES1Renderer.m for my entire game state. I have an array of bullet structs, an array on enemy structs, etc.. Besides using this structure, where my entire game state is in ES1Renderer.m as C arrays and structs, what other ways are there to structure the code? Should I be using C++ or Objective-C classes to represent the enemies so they are more modular? The main reason I ask this is because I don't normally code in C, C++ and Objective-C..so I am a little fuzzy on coming up with a good architecture here.

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  • ASP.NET MVC 2 Authorization Regex

    - by Hurricanepkt
    What i currently have is the following: namespace AzureCCCMVC.Controllers { [Authorize(Roles="Admin")] public class AdminController : Controller { //Stuff } } what I want to do is have roles for each client such as Roles { "DEMOAdmin", "GOOGAdmin" , "MSFTAdmin" } and be able to Authorize The Client name (from URL) and in that role I know I am doing a horrible job of explaining this... It is possible that I can have users that are users of several clients but only admin's of one ...

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  • How to redirect by checking for a particular previous url

    - by Bearish_Boring_dude
    I have the following piece of code in my controller def index session[:previous_url] = URI(request.referer).path if session[:previous_uri] != new_path redirect_to registration_path(id: current_user.associate_username) end end However this does not actually work and i get a bad URI error. I just want to check if the request came from a particular page and if not redirect it to another page. I would also like to know if there is a better way for doing this?.Thank you

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  • Unable to send an associative array in JSON format in Zend to client

    - by Anorflame
    Hi, In one of my actions in a controller, I'm using the json view helper to send back a response to an ajax request. On the client side I alert the data that is passed to the success callback function. It works fine as long as the response is a number or an array with default keys. Once I try to send an associative array, it alerts with [object Object]. Server code: $childArray = array('key'=>'value'); $this->_helper->json($childArray); javascript: function displayChildren(data){ alert(data); } ... $.ajax({ url: "/po/add", dataType: "json", data: {format: "json"}, success: displayChildren }); I have no idea what am I doing wrong here, so any help would be appreciated...

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  • node.js storing gamestate, how?

    - by expressnoob
    I'm writing a game in javascript, and to prevent cheating, i'm having the game be played on the server (it's a board game like a more complicated checkers). Since the game is fairly complex, I need to store the gamestate in order to validate client actions. Is it possible to store the gamestate in memory? Is that smart? Should I do that? If so, how? I don't know how that would work. I can also store in redis. And that sort of thing is pretty familiar to me and requires no explanation. But if I do store in redis, the problem is that on every single move, the game would need to get the data from redis and interpret and parse that data in order to recreate the gamestate from scratch. But since moves happen very frequently this seems very stupid to me. What should I do?

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  • Java Servlet says file does not exist

    - by Austin
    Hello World! I have developed a java servlet that monitors a folder on a network drive for new files then does some actions on them depending on what kind of file it is. It worked in Eclipse when Eclipse and Tomcat were running with each other, but now that I have deployed it onto a server(different machine), the servlet keeps logging that it cannot find the folder to be mapped. The exact same network drive is mapped, and the folder definitely exists. This problem only occurs when the servlet is run on the server, not on the development machine. Thanks! PS: It is a Windows Server 2003 Enterprise Server with Tomcat v6 installed.

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  • Returning back to the results after editing

    - by Parhs
    Hello, I am developing an application which has several CRUD actions... I am using Java and i am forced to use Struts framework. My problem is: I have a search page which returns some results.The user can click at a result and then he goes to another edit-page... He may apply changes or not...What i need is a way to return at the result page again and at the same scroll position.Javascript must be enabled for this project however.. I am wondering which is the best practice to achieve this effect... A solution would be to save the last search URL but i know that this wouldnt work if the user has multiple results. I know how to do it but i am lloking for a good practice!

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  • NetBeans & PHPUnit

    - by Ahmed
    i have a problem in crateing the PHPUnit tests. where the framework i am using is codeignaitor in addition to doctorin for the ORM the error it i got is cannt find class controller

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  • zend framework - view not rendering

    - by Ashley
    Hi My zend framework render function returns: Warning: include(C:\wamp\www\cms\application\modules\default\views\scripts) [function.include]: failed to open stream: Permission denied... It's being called in a postDispatch function on the controller, but that doesn't matter as no matter where i put it, it fails. Any ideas? My view and layout are started in the bootstrap. Thanks

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  • Disabling a window after SendInput()

    - by DD
    From my application I want to do two 'very basic' actions: 1. send a bunch of input (movemouse on window 'W', click, movemouse back) using SendInput() 2. disable window 'W' either by setting its layered alpha property to zero or using EnableWindow(W, FALSE). No matter what the delay between 1 and 2 is, it doesn't work. If I don't ever disable the window, if I don't do step 2, then it works great all the time. I tried putting a Sleep(10000) and it still didn't work. Window gets disabled but it doesn't receive the input. What could I be missing here?

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  • 3D framework/library os x

    - by Deano
    Does anyone have any advice as to a good framework for simplifying the generation of 3D models? I am trying to construct a parametric program for tasks such as ship design. Actions such as surface modelling, intersections etc are a must. I have investigated openCASCADE and it shows promise but getting it to integrate into a native cocoa interface is not currently achievable (By me at any rate). All ideas and suggestions welcome. Should I just forget it and integrate an X11 window, if so any tutorials for doing this?

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  • Convert a form_tag select_datetime to SQL datetime

    - by Mitchell
    Hi I am trying to make a simple search form that uses a startTime and endTime to specify a time range. The db has a datetime field time that is compared against. So far when i try to use params[:startTime] in the controller I get an array of values which wont work with :conditions = ['time < ?', params[:endTime]] Is there a simple solution to parse the form's datetime to SQL datetime?

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  • what's the right way to cause a subview to redraw when the device orientation changes?

    - by RobertL
    I have a view controller with a view and one subview. When the device orientation changes the view auto-redraws but the subview doesn't. If I explicitly do [subview setNeedsDisplay] it redraws but I don't have a logical place to put that call in my code. And, since I don't have to explicitly tell the view to redraw, it seems counter-intuitive to tell the subview to redraw. Is there a way to make the subview auto-redraw when the view redraws?

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  • Touch Screen Product Catalog for Retail Store

    - by Patrick
    I am a UI/UX designer and I would like to create kiosk type of app that would be a product catalog (help/suggestor) for customers in a retail store using a touch screen monitor (and computer). Something as simple as this: http://www.youtube.com/watch?v=aoH0u6YTTK4 This is what I would like it to do: 1st Screen (Main Menu): Pick a type of category (For example: Dog, Cat, Small Animal) 2nd Screen pick a sub-category of a main category (For example: Puppy, Adult, Senior - DOG) 3rd Screen pick a sub-category of previous sub-category (For example: Food, Healthy, Toys) Then it will display a list of all products with a picture, small description, and price. Thats it. So the point of the kiosk is to help customers find certain products that match their pet criteria. (Dog Puppy Healthy Dog Food) I am wondering what is the best solution: RIA (Flex/Air or Silveright) or flash/action script. I am not sure what is the best technology to use for the following benefits: user-experience (smoothness of touch screen actions) and fast development.

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  • Handling null values with PowerShell dates

    - by Tim Ferrill
    I'm working on a module to pull data from Oracle into a PowerShell data table, so I can automate some analysis and perform various actions based on the results. Everything seems to be working, and I'm casting columns into specific types based on the column type in Oracle. The problem I'm having has to do with null dates. I can't seem to find a good way to capture that a date column in Oracle has a null value. Is there any way to cast a [datetime] as null or empty?

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  • Using HTML in Swing Applications

    - by Padur
    Hello all Need some help here..I am trying to write a simple swing application which displays some text based on user actions. Its like help where user clicks on some url and he is redirected to that page. I have huge html code and I want to render it in swing components. I was able to do it in JDK1.6 software but not in JDK1.4. Is there any way we can render complex html in swing components in JDK 1.4 software? I appreciate help. Thanks Padur

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  • Navigating to rootViewController of non-visible UINavigationController CRASH

    - by Bertie
    First off I'n not sure if this is exactly the issue... but it appears to be central to the problem. There are vast gaps in what I know and this may be something very obvious. I have a split view controller with various Master and Detail Views. From one 'menu' branch I want to return to the rootView of both the Master & Detail Navigation Controllers when the user taps a 'Done' button. Initially I had the button positioned on the navigation bar of the master view. This is the code I was using: - (IBAction)doneClicked:(id)sender { UINavigationController *detailNav = [self.splitViewController.viewControllers objectAtIndex:1]; NSArray *allDetailViewControllers = detailNav.viewControllers; HomePage *destinationDetailVC = [allDetailViewControllers objectAtIndex:0]; destinationDetailVC.splitViewBarButtonItem = self.splitViewButton; [detailNav popToRootViewControllerAnimated:NO]; [self.navigationController popToRootViewControllerAnimated:NO]; } That works fine but if the device is in portrait mode it means the user has to open the menus to access the button. So I decided to put the 'Done' button onto the detail view NavBar instead. Using a delegate declared in the detailVC and adopted by the masterVC I am now using this method: - (void)theUserClickedDoneInTheDetailView:(DetailVC *)controller withButton:(UIBarButtonItem *)splitViewButton { UINavigationController *detailNav = [self.splitViewController.viewControllers objectAtIndex:1]; NSArray *allDetailViewControllers = detailNav.viewControllers; HomePage *destinationDetailVC = [allDetailViewControllers objectAtIndex:0]; destinationDetailVC.splitViewBarButtonItem = splitViewButton; [detailNav popToRootViewControllerAnimated: NO]; [self.navigationController popToRootViewControllerAnimated:NO]; } Both methods are in the MasterVC.m file The only difference between the two is that on is passed a UIBarButtonItem to use and the other has already had it passed when it is set in the detail view. That seems to be working because I do get a button. When the device is in Landscape mode both methods work fine. All behaviour as expected. When the device is in Portrait the first method still works fine. The second appears to work fine and the detail view is the rootView, the button for the menus is there BUT, as soon as I turn the device to landscape it crashes. The only thing I can think of is that it is because the masterView is hidden. Can anyone help...?

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  • declerative_authorization on User problem

    - by Webpain
    I am trying to block all default methods except create and update in my users controller using declerative_authorization. But at the time I add filter_resource_access or filter_access_to into my usersController i always get "Couldn't find User without an ID". Anyone care to explain why this could be happening? class UsersController :new end end def show @user = @current_user end def edit @user = @current_user end def update @user = @current_user # makes our views "cleaner" and more consistent if @user.update_attributes(params[:user]) flash[:notice] = "Account updated!" redirect_to account_url else render :action = :edit end end end

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