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  • Why can't I inherit static classes?

    - by User
    I have several classes that do not really need any state. From the organizational point of view, I would like to put them into hierarchy. But it seems I can't declare inheritance for static classes. Something like that: public static class Base { } public static class Inherited : Base { } will not work. Why have the designers of the language closed that possibility?

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  • .hgignore for VB.Net (Express)?

    - by OverTheRainbow
    Hello I didn't see a question on this subject in the archives, so here goes: For those of you experienced Mercurial users, is this a correct .hgignore file to tell VB.Net Express to ignore files/sub-dirs when adding items in a new repository? bin obj temp *.user *.suo *.ncb Thank you.

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  • How do I use accepts_nested_attributes_for? I cannot use the .build method (!)

    - by Angela
    Editing my question for conciseness and to update what I've done: How do I model having multiple Addresses for a Company and assign a single Address to a Contact, and be able to assign them when creating or editing a Contact? Here is my model for Contacts: class Contact < ActiveRecord::Base attr_accessible :first_name, :last_name, :title, :phone, :fax, :email, :company, :date_entered, :campaign_id, :company_name, :address_id, :address_attributes belongs_to :company belongs_to :address accepts_nested_attributes_for :address end Here is my model for Address: class Address < ActiveRecord::Base attr_accessible :street1, :street2, :city, :state, :zip has_many :contacts end I would like, when creating an new contact, access all the Addresses that belong to the other Contacts that belong to the Company. So here is how I represent Company: class Company < ActiveRecord::Base attr_accessible :name, :phone, :addresses has_many :contacts has_many :addresses, :through => :contacts end Here is how I am trying to create a field in the View for _form for Contact so that, when someone creates a new Contact, they pass the address to the Address model and associate that address to the Contact: <% f.fields_for :address, @contact.address do |builder| %> <p> <%= builder.label :street1, "Street 1" %> </br> <%= builder.text_field :street1 %> <p> <% end %> When I try to Edit, the field for Street 1 is blank. And I don't know how to display the value from show.html.erb. At the bottom is my error console -- can't seem to create values in the address table: My Contacts controller is as follows: def new @contact = Contact.new @contact.address.build # I GET AN ERROR HERE: says NIL CLASS @contact.date_entered = Date.today @campaigns = Campaign.find(:all, :order => "name") if params[:campaign_id].blank? else @campaign = Campaign.find(params[:campaign_id]) @contact.campaign_id = @campaign.id end if params[:company_id].blank? else @company = Company.find(params[:company_id]) @contact.company_name = @company.name end end def create @contact = Contact.new(params[:contact]) if @contact.save flash[:notice] = "Successfully created contact." redirect_to @contact else render :action => 'new' end end def edit @contact = Contact.find(params[:id]) @campaigns = Campaign.find(:all, :order => "name") end Here is a snippet of my error console: I am POSTING the attribute, but it is not CREATING in the Address table.... Processing ContactsController#create (for 127.0.0.1 at 2010-05-12 21:16:17) [POST] Parameters: {"commit"="Submit", "authenticity_token"="d8/gx0zy0Vgg6ghfcbAYL0YtGjYIUC2b1aG+dDKjuSs=", "contact"={"company_name"="Allyforce", "title"="", "campaign_id"="2", "address_attributes"={"street1"="abc"}, "fax"="", "phone"="", "last_name"="", "date_entered"="2010-05-12", "email"="", "first_name"="abc"}} Company Load (0.0ms)[0m [0mSELECT * FROM "companies" WHERE ("companies"."name" = 'Allyforce') LIMIT 1[0m Address Create (16.0ms)[0m [0;1mINSERT INTO "addresses" ("city", "zip", "created_at", "street1", "updated_at", "street2", "state") VALUES(NULL, NULL, '2010-05-13 04:16:18', NULL, '2010-05-13 04:16:18', NULL, NULL)[0m Contact Create (0.0ms)[0m [0mINSERT INTO "contacts" ("company", "created_at", "title", "updated_at", "campaign_id", "address_id", "last_name", "phone", "fax", "company_id", "date_entered", "first_name", "email") VALUES(NULL, '2010-05-13 04:16:18', '', '2010-05-13 04:16:18', 2, 2, '', '', '', 5, '2010-05-12', 'abc', '')[0m

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  • Proving that P <= NP

    - by Gail
    As most people know, P = NP is unproven and seems unlikely to be true. The proof would prove that P <= NP and NP <= P. Only one of those is hard, though. P <= NP is almost by definition true. In fact, that's the only way that I know how to state that P <= NP. It's just intuitive. How would you prove that P <= NP?

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  • When using delegates, need better way to do sequential processing

    - by Padawan
    I have a class WebServiceCaller that uses NSURLConnection to make asynchronous calls to a web service. The class provides a delegate property and when the web service call is done, it calls a method webServiceDoneWithXXX on the delegate. There are several web service methods that can be called, two of which are say GetSummary and GetList. The classes that use WebServiceCaller initially need both the summary and list so they are written like this: -(void)getAllData { [webServiceCaller getSummary]; } -(void)webServiceDoneWithGetSummary { [webServiceCaller getList]; } -(void)webServiceDoneWithGetList { ... } This works but there are at least two problems: The calls are split across delegate methods so it's hard to see the sequence at a glance but more important it's hard to control or modify the sequence. Sometimes I want to call just GetSummary and not also GetList so I would then have to use an ugly class-level state variable that tells webServiceDoneWithGetSummary whether to call GetList or not. Assume that GetList cannot be done until GetSummary completes and returns some data which is used as input to GetList. Is there a better way to handle this and still get asynchronous calls? Update based on Matt Long's answer: Using notifications instead of a delegate, it looks like I can solve problem #2 by setting a different selector depending on whether I want the full sequence (GetSummary+GetList) or just GetSummary. Both observers would still use the same notification name when calling GetSummary. I would have to write two separate methods to handle GetSummaryDone instead of using a single delegate method (where I would have needed some class-level variable to tell whether to then call GetList). -(void)getAllData { [[NSNotificationCenter defaultCenter] addObserver:self              selector:@selector(getSummaryDoneAndCallGetList:)                  name:kGetSummaryDidFinish object:nil];     [webServiceCaller getSummary]; } -(void)getSummaryDoneAndCallGetList { [NSNotificationCenter removeObserver] //process summary data [[NSNotificationCenter defaultCenter] addObserver:self              selector:@selector(getListDone:)                  name:kGetListDidFinish object:nil];     [webServiceCaller getList]; } -(void)getListDone { [NSNotificationCenter removeObserver] //process list data } -(void)getJustSummaryData { [[NSNotificationCenter defaultCenter] addObserver:self              selector:@selector(getJustSummaryDone:) //different selector but                  name:kGetSummaryDidFinish object:nil]; //same notification name     [webServiceCaller getSummary]; } -(void)getJustSummaryDone { [NSNotificationCenter removeObserver] //process summary data } I haven't actually tried this yet. It seems better than having state variables and if-then statements but you have to write more methods. I still don't see a solution for problem 1.

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  • Now with GWT2, what are the advantages over wicket and likewise?

    - by Antony Stubbs
    Apart from the argument of wicket's simplicity (that is, wicket is a simpler system IMHO) and GWT's responsiveness in the client (GWT's client side state and javascript - potentially complex client side code) and GWT's greater potential for scaling, what is the argument for using GWT over wicket? Personally I've done a lot of wicket development, but have only had a quick look at GWT a long time ago.

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  • I want to scramble an array in PHP

    - by BRUL
    I want PHP to randomly create a multi-dimensional array by picking a vast amount of items out of predefined lists for n times, but never with 2 times the same. Let me put that to human words in a real-life example: i want to write a list of vegetables and meat and i want php to make a menu for me, with every day something else then yesterday. I tried and all i got was the scrambling but there were always doubles :s

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  • http error code 12019 in Ajax call

    - by Bas Hendriks
    Hi, When executing a ajax call i received a http error code 12019. This call works most of the time, but in rare occasions i get this errorcall. I found that this error code is described as "The requested operation cannot be carried out because the handle supplied is not in the correct state." (@msdn). Can anybody tell me what this means? Thanx, Bas Hendriks

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  • WCF web service: response is 200/ok, but response body is empty

    - by user1021224
    I am creating a WCF web api service. My problem is that some methods return a 200/OK response, but the headers and the body are empty. In setting up my web service, I created an ADO.NET Entity Data Model. I chose ADO.NET DbContext Generator when I added a code generation item. In the Model.tt document, I changed HashSet and ICollection to List. I built my website. It used to be that when I coded a method to return a List of an entity (like List<Customer> or List<Employee> in the Northwind database), it worked fine. Over time, I could not return a List of any of those, and could only grab one entity. Now, it's gotten to a point where I can return a List<string> or List<int>, but not a List or an instance of any entity. When I try to get a List<AnyEntity>, the response is 200/OK, but the response headers and body are empty. I have tried using the debugger and Firefox's Web Console. Using FF's WC, I could only get an "undefined" status code. I am not sure where to go from here. EDIT: In trying to grab all Areas from the database, I do this: [WebGet(UriTemplate = "areas")] public List<a1Areas> AllAreas() { return context.a1Areas.ToList(); } I would appreciate any more methods for debugging this. Thanks in advance. Found the answer, thanks to Merlyn! In my Global.asax file, I forgot to comment out two lines that took care of proxies and disposing of my context object. The code is below: void Application_BeginRequest(object sender, EventArgs e) { var context = new AssignmentEntities(); context.Configuration.ProxyCreationEnabled = false; HttpContext.Current.Items["_context"] = context; } void Application_EndRequest(object sender, EventArgs e) { var context = HttpContext.Current.Items["_context"] as AssignmentEntities; if (context != null) { context.Dispose(); } }

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  • Tag problem c# listbox

    - by Poppy
    Hi i'm trying to use the tag item of a listbox. heres my code. int number = 0; foreach (ListViewItem item in listBox1.Items) { Tag tag = (Tag) item.Tag; saveSlide(showid, tag.photoid, enumber); number++; } problem im havin is when i run the program i get an error message sayin cannot convert type string to system.ListView but i haven't declared item as a string anywher in my program

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  • Queue ExternalInterface calls to Flash Object in UpdatePanel - Needs Improvement?

    - by Laramie
    A Flash (actually Flex) object is created on an ASP.Net page within an Update Panel using a modified version of the embedCallAC_FL_RunContent.js script so it can be written in dynamically. It is re-created with this script with each partial postback to that panel. There are also other Update Panels on the page. With some postbacks (partial and full), External Interface calls such as $get('FlashObj').ExternalInterfaceFunc('arg1', 0, true); are prepared server-side and added to the page using ScriptManager.RegisterStartupScript. They're embedded in a function and stuffed into Sys.Application's load event, for example Sys.Application.add_load(funcContainingExternalInterfaceCalls). The problem is that because the Flash object's state state may change with each partial postback, the Flash (Flex) object and/or External Interface may not be ready or even exist yet in the DOM when the JavaScript - Flash External Interface call is made. It results in an "Object doesn't support this property or method" exception. I have a working strategy to make the ExternalInterface calls immediately if Flash is ready or else queue them until such time that Flash announces its readiness. //Called when the Flash object is initialized and can accept ExternalInterfaceCalls var flashReady = false; //Called by Flash when object is fully initialized function setFlashReady() { flashReady = true; //Make any queued ExternalInterface calls, then dequeue while (extIntQueue.length > 0) (extIntQueue.shift())(); } var extIntQueue = []; function callExternalInterface(flashObjName, funcName, args) { //reference to the wrapped ExternalInterface Call var wrapped = extWrap(flashObjName, funcName, args); //only procede with ExternalInterface call if the global flashReady variable has been set if (flashReady) { wrapped(); } else { //queue the function so when flashReady() is called next, the function is called and the aruments are passed. extIntQueue.push(wrapped); } } //bundle ExtInt call and hold variables in a closure function extWrap(flashObjName, funcName, args) { //put vars in closure return function() { var funcCall = '$get("' + flashObjName + '").' + funcName; eval(funcCall).apply(this, args); } } I set the flashReady var to dirty whenever I update the Update Panel that contains the Flash (Flex) object. ScriptManager.RegisterClientScriptBlock(parentContainer, parentContainer.GetType(), "flashReady", "flashReady = false;", true); I'm pleased that I got it to work, but it feels like a hack. I am still on the learning curve with respect to concepts like closures why "eval()" is apparently evil, so I'm wondering if I'm violating some best practice or if this code should be improved, if so how? Thanks.

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  • GWT: library for encoding/decoding arbitrary data in URL fragments

    - by Caffeine Coma
    Ajax applications, and GWT in particular, use the URL fragment (e.g. http://example.com/myapp#fragment) to maintain application state on the client without reloading the page. Is there a GWT library that facilitates the encoding and decoding of arbitrary parameters into the URL fragment? I'm looking for something analogous to the Servlet API's getParameter() method, but for client-side URL parameters.

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  • Guidance related to Paypal Integration Using Codeigniter

    - by anum
    I need some guidance related to Paypal Integration. Its not similar to regular cart. After checkout, the site offers a form for payment option, either its paypal or some other payment process. The form directs to controller after submit. A array exists which contains all items value, from here on how can I proceed to paypal site. How can I do this?

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  • Based on your development stack, which is easier for you and why? Debugging or logging?

    - by leeand00
    Please state if you are developing on the front end, back end, or if you are developing a mobile/desktop application. List your development stack Language, IDE, etc.. Unit Testing or no Unit Testing Be sure to include any AOP frameworks if used. Tell me if it is easier for you to use debugging or to using logging during development, and why you feel it is easier. I'm just trying to get a feel for why people choose debugging or logging based on their development stack.

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  • Reading HTTP server push streams with Python

    - by Sam
    I'm playing around trying to write a client for a site which provides data as an HTTP stream (aka HTTP server push). However, urllib2.urlopen() grabs the stream in its current state and then closes the connection. I tried skipping urllib2 and using httplib directly, but this seems to have the same behaviour. Is there a way to get the stream to stay open, so it can be checked each program loop for new contents, rather than waiting for the whole thing to be redownloaded every few seconds, introducing lag?

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  • How to get a group of toggle buttons to act like radio buttons in WPF?

    - by code-zoop
    I have a group of buttons that should act like toggle buttons, but also as radio buttons where only one button can be selected / pressed down at a current time. It also need to have a state where none of the buttons are selected / pressed down. The behavior will be kind of like Photoshop toolbar, where zero or one of the tools are selected at any time! Any idea how this can be implemented in WPF?

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  • Properly Establishing an ApplicationEndpoint in UCMA 3.0

    - by user570720
    I've been struggling with getting an application endpoint working on UCMA 3.0. I am trying to run an application on a server separate from the Lync server which uses a registered ApplicationEndpoint to monitor presence and act as a bot which can send other users messages. I used to have my code working with a UserEndpoint (which was fine for monitoring presence), but did not have the capabilities to send IMs to other Lync users. After searching the web, I'm finally at the point where I'm getting this error when running my code: System.ArgumentException was unhandled Message=An ApplicationEndpoint can be registered only if proxy and Multual Tls have been specified. Source=Microsoft.Rtc.Collaboration StackTrace: at Microsoft.Rtc.Collaboration.ApplicationEndpoint..ctor(CollaborationPlatform platform, ApplicationEndpointSettings settings) at Waldo.endpointHelper.CreateApplicationEndpoint(ApplicationEndpointSettings applicationEndpointSettings) in C:\Users\l1m5\Desktop\waldoproject\trunk\WaldoSoln\waldoGrabPresence\endpointHelper.cs:line 117 at Waldo.endpointHelper.CreateEstablishedApplicationEndpoint(String endpointFriendlyName) in C:\Users\l1m5\Desktop\waldoproject\trunk\WaldoSoln\waldoGrabPresence\endpointHelper.cs:line 228 at Waldo.waldoGrabPresence.Run() in C:\Users\l1m5\Desktop\waldoproject\trunk\WaldoSoln\waldoGrabPresence\waldoGrabPresence.cs:line 60 at Waldo.waldoGrabPresence.Main(String[] args) in C:\Users\l1m5\Desktop\waldoproject\trunk\WaldoSoln\waldoGrabPresence\waldoGrabPresence.cs:line 42 at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: After some searching, I followed the instructions here: http://blogs.claritycon.com/blogs/michael_greenlee/archive/2009/03/21/installing-a-certificate-for-ucma-v2-0-applications.aspx to import a certificate onto the server that I'm trying to run the application on, but to no avail. So at this point, I think that there must be something wrong with how I'm setting up the ApplicationEndpointSettings, CollaberationPlatform or ApplicationEndpoint objects. Here's how I'm doing it: ApplicationEndpointSettings settings = new ApplicationEndpointSettings(_ownerURIPrompt, _serverFQDNPrompt, _trustedPortPrompt); ServerPlatformSettings settings = new ServerPlatformSettings(null, _serverFQDNPrompt, _trustedPortPrompt, _trustedApplicationGRUU); _collabPlatform = new CollaborationPlatform(settings); _applicationEndpoint = new ApplicationEndpoint(_collabPlatform, applicationEndpointSettings); Does anyone see any problems with what I'm doing? Or, better yet, does anyone know of a blog that walks you through establishing an application endpoint in the situation I'm in? I work really well with tutorials or samples, but have not found one that seems to accomplish what I'm trying to do. Thanks for the help!

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