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• Include FileUtils raises an error

  - by Bilal Aslam

  I am trying to install CruiseControl.rb on an Amazon EC2 instance. I get this error in the mongrel log: /data/cruisecontrol/releases/20100313003145/vendor/rails/activesupport/lib/active_support/dependencies.rb:105:in `const_missing': uninitialized constant ProjectsMigration::FileUtils (NameError) This error is raised in a file called projects_migration.rb: http://gist.github.com/331025. Check out line 3, which I have commented out. If you remove the comment-out, you will get this error as well. The weird part: from ruby script/console I can include FileUtils just fine!

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• Which layer should create DataContext?

  - by Kevin

  I have a problem to decide which layer in my system should create DataContext. I have read a book, saying that if do not pass the same DataContext object for all the database updates, it will sometimes get an exception thrown from the DataContext. That's why i initially create new instance of DataContext in business layer, and pass it into data access layer. So that the same datacontext is used for all the updates. But this lead to one design problem, if i wanna change my DAL to Non-LinqToSQL in future, i need to re-write the code in business layer as well. Please give me some advice on this. Thanks. Example code 'Business Layer Public Sub SaveData(name As String) Using ts AS New TransactionScope() Using db As New MyDataContext() DAL.Insert(db,name) DAL.Insert(db,name) End Using ts.Complete() End Using End Sub 'Data Access Layer Public Sub Insert(db as MyDataContext,name As string) db.TableAInsert(name) End Sub

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• Learning OOP Design

  - by waiwai933

  I've read Head First Java, and I understand how OOP works. Here's my problem: I'm a PHP programmer, and while I've used OOP in PHP, I'm having trouble figuring out what should be an object and what methods to give it. For example, let's say I have a app that allows people to log in and edit a document. Why should the document be an object if there will ever only be one instance? Should I give the deleteDocument() method to the document object or the admin object? The document is the one being deleted, but the admin is the one performing the action. So my real question is, coming from a procedural background, how do I figure out what should be objects and what should have what methods?

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• WPF UserControls - setting the .Command property on button inside UserControl

  - by Judah Himango

  I've got a UserControl that contains a button and some other controls: <UserControl> <StackPanel> <Button x:Name="button" /> ... </StackPanel> </UserControl> When I create a new instance of that control, I want to get at the Button's Command property: <my:GreatUserControl TheButton.Command="{Binding SomeCommandHere}"> </my:GreatUserControl> Of course, the "TheButton.Command" thing doesn't work. So my question is: Using XAML, how can I set the .Command property of the button inside my user control?

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• NSNotificationCenter and ASIHTTPRequest

  - by user262325

  Hello everyone: I hope to get the http header info(file size) in asynchronous mode. So I initialize as codes: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(processReadResponseHeaders:) name:@"readResponseHeaders" object:nil]; my codes to read the http header -(void)processReadResponseHeaders: (ASIHTTPRequest *)request ;//(id)sender; { unsigned long long contentLength = [request contentLength]; //error occurs here } It has to change the source code of ASIHTTPRequest.m I did add my codes in function readResponseHeaders to notify the event is triggered ) - (void)readResponseHeaders { //......................... [[NSNotificationCenter defaultCenter] postNotificationName:@"readResponseHeaders" object:self];// } the log file reports: 2010-05-15 13:47:38.034 myapp[2187:6a63] * -[NSConcreteNotification contentLength]: unrecognized selector sent to instance 0x46e5bb0 Welcome any comment Thanks interdev

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• Problems setting up an ASP.NET MVC site on IIS7 w/ Nhibernate

  - by Brandon

  When deploying my published website to the host (Its a shared hosting plan) I get this error: [NullReferenceException: Object reference not set to an instance of an object.] System.Web.PipelineStepManager.ResumeSteps(Exception error) +929 System.Web.HttpApplication.BeginProcessRequestNotification(HttpContext context, AsyncCallback cb) +91 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +508 I found this question which describes my problem, but I'm not initializing NHibernate in Application_Start, it is already being done in Init. The only other cause of this error I can find is that the Global.asax file is inheriting from a class other than HttpApplication, but I'm not doing that either. This is pretty much the Global.asax file protected void Application_Start() { AreaRegistration.RegisterAllAreas(); RegisterRoutes(RouteTable.Routes); } public override void Init() { base.Init(); if (_wasNHibernateInitialized) return; // Initialize NHibernate // Other setup like the StructureMap initialization } Is there any other reason why an ASP.NET MVC application would give this error when being deployed to IIS7?

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• GDB says that a KVO observer is registered even though it is not (or is it?).

  - by Paperflyer

  When my application is closed, the main controller class removes itself as Observer from the model and then releases the model. Like this: - (void)dealloc { [theModel removeObserver:self forKeyPath:@"myValue"]; [theModel release]; [super dealloc]; } And right after that, the debugger says: 2010-04-29 14:07:40.294 MyProgram[13678:a0f] An instance 0x116f2e880 of class TheModel was deallocated while key value observers were still registered with it. Observation info was leaked, and may even become mistakenly attached to some other object. Set a breakpoint on NSKVODeallocateBreak to stop here in the debugger. Here's the current observation info: <NSKeyValueObservationInfo 0x100288450> ( <NSKeyValueObservance 0x1002aca90: Observer: 0x116f40ec0, Key path: myValue, Options: <New: YES, Old: NO, Prior: NO> Context: 0x0, Property: 0x116f80430> ) where 0x116f2e880 is indeed the model and 0x116f40ec0 is indeed the controller. How can the controller still be an observer when it just removed itself as an observer?

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• VS2008 on Win7 64-Bit: Debugging a Windows Service

  - by Richard

  Hi all, I'm trying to debug a Windows Service using VS2008 on Win7 64-Bit. The problem I'm having is that none of my breakpoints are being hit, regardless of which build configuration I choose: x86, x64 or AnyCPU. Using "Attach to Process" after the service has started, none of the breakpoints are hit - yet the IDE doesn't inform me that they won't be hit (by making the solid red circle and outline, for instance) - it simply seems to act as if the breakpoints weren't even there. Can anyone point me in the right direction here? Thanks /Richard.

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• How far does Dependency Injection reach?

  - by Baddie

  My web app solution consists of 3 projects: Web App (ASP.NET MVC) Business Logic Layer (Class Library) Database Layer (Entity Framework) I want to use Ninject to manage the lifetime of the DataContext generated by the Entity Framework in the Database Layer. The Business Logic layer consists of classes which reference repositories (located in the database layer) and my ASP.NET MVC app references the business logic layer's service classes to run code. Each repository creates an instance of the MyDataContext object from the Entity Framework Repository public class MyRepository { private MyDataContext db; public MyRepository { this.db = new MyDataContext(); } // methods } Business Logic Classes public class BizLogicClass { private MyRepository repos; public MyRepository { this.repos = new MyRepository(); } // do stuff with the repos } Will Ninject handle the lifetime of MyDataContext despite the lengthy dependency chain from the Web App to the Data Layer?

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• Create New Pseudo Variables in Squeak

  - by Artium

  Large part of squeak is implemented using squeak itself. I am curious to know if pseudo variables such as self or true are also implemented using squeak. If the answer is yes, where the implementation located? Specifically, assume that I want to add new subclass of "Boolean" called "Other" which will represent a third option: neither true nor false. I want that other, the only instance of Other to be similar to the true/false global singletons. Any ideas? Thank you.

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• Google Analytics API - Tying Behavior to Specific Dates

  - by DavidS

  I am using the API to understand the performance of Adwords ad campaigns. I need to know how to attribute metrics back to the date dimension. For instance, for a given date, if I have 20 clicks, 18 visits, and 3 goal completions, does it mean that: 1) All of these actions happened on the day in question and are otherwise independent (meaning that the 3 goals could have been for people that clicked any time in the past 30 days, not who clicked on that day) 2) The on-site actions are a subset of the click activity on that day (i.e. on that day, 20 people clicked, 18 registered a real visit, and 3 completed a goal) If it is scenario 2, does that mean there is a need to refresh old rows every day? Thanks!

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• Dialing a command prefix on the iPhone

  - by tewha

  Our application lets users call phone numbers. Users would like to be able to block their caller ID. On other platforms, we let the user specify a custom dialing prefix. For instance, on my cell provider it's #31#. I've tried two approaches so far. First: id url = [NSURL URLWithString: @"tel:#31#0000000"] // produces nil Second: id encoder = ["#31#0000000" stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]; // produces %2331%230000000 id url = [NSURL URLWithString: [NSString stringWithFormat: @"tel:%@", encoded]]; // produces a valid-looking NSURL which doesn't do anything I'm thinking at this point that I'm just not allowed to dial # and *, even from a Cocoa touch application. (I know it's not allowed from a web app.) Is this true, or am I missing something obvious?

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• In UISplitViewController rootView/masterView to tell detailView to push a viewcontroller ?

  - by arash13

  This is almost a follow up of my last question. Now i have a splitview with a rootview / leftview that has a table and detailview / rightView that has some view controller pushed into it's navigationcontroller. So this is what i want to achieve: When i tap on a tablerow on my rootView , i want my detail view to push a viewController associated with that row... any ideas ? I also tried making a protocol on my tableviewcontroller and have it implemented in detailview controller .. but i dont know how to call it, is it [self performselector:.... ? case 1:{switch ([indexPath row]) { case 0:{[_detailViewController.navigationController pushViewController:_s2d animated:YES]; // just trying to push it from here but didnt work }break; case 1:{ [_detailViewController loadEqViewController]; // this one is an instance method in detailview it is being called but nothing happends }break; }}break;

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• Detect the URI encoding automatically in Tomcat

  - by Roland Illig

  I have an instance of Apache Tomcat 6.x running, and I want it to interpret the character set of incoming URLs a little more intelligent than the default behavior. In particular, I want to achieve the following mapping: So%DFe => Soße So%C3%9Fe => Soße So%DF%C3%9F => (error) The bevavior I want could be described as "try to decode the byte stream as UTF-8, and if it doesn't work assume ISO-8859-1". Simply using the URIEncoding configuration doesn't work in that case. So how can I configure Tomcat to encode the request the way I want? I might have to write a Filter that takes the request (especially the query string) and re-encodes it into the parameters. Would that be the natural way?

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• Casting Error with Reflection

  - by Mitchel Sellers

  I have an application that uses plugins that are managed via an interface I then dynamically load the plugin classes and cast them to the interface to work with them. I have the following line of code, assume that IPlugin is my interface. IPlugin _plugin = (IPlugin)Activator.CreateInstance(oInfo.Assembly, oInfo.FullyQualifiedName) This should be pretty simple, create the instance and cast it to the interface. I know that the assembly and fully qualified name values are correct, but I am getting the following exception. Exception= System.InvalidCastException: Unable to cast object of type ‘System.Runtime.Remoting.ObjectHandle’ to type ‘MyNamespace.Components.Integration.IPlugin’. at MyNamespace.Components.Integration.PluginProxy..ctor(Int32 instanceId) Any ideas what could cause this?

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• PHP Tag Cloud System

  - by deniz

  Hi, I am implementing a tag cloud system based on this recommendation. (However, I am not using foreign keys) I am allowing up to 25 tags. My question is, how can I handle editing on the items? I have this item adding/editing page: Title: Description: Tags: (example data) computer, book, web, design If someone edits an item details, do I need to delete all the tags from Item2Tag table first, then add the new elements? For instance, someone changed the data to this: Tags: (example data) computer, book, web, newspaper Do I need to delete all the tags from Item2Tag table, and then add these elements? It seems inefficient, but I could find a more efficient way. The other problem is with this way is, if someone edits description but does not change the tags box, I still need to delete all the elements from Item2Tag table and add the same element. I am not an experienced PHP coder, so could you suggest a better way to handle this? (pure PHP/MySQL solution is preferable) Thanks in advance,

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• Understanding how to inject object dependencies

  - by Hans

  I have an object that loads an instance of another object in a method. $survey = new survey; $question = new question($survey); $question-load($question_id); class question { public function __construct(&$survey) { $this-survey = $survey; } public function load ($id) { // now a question is loaded // want to load the survey that this question is in $this->survey->load($this->get('survey_id')); // ** survey_id is a field in the questions table // now $this->survey object has all the info about the survey this question is in } private function get($name) { // returns $name, if isset() from array that load() sets } } This is frying my brain, though, because it seems like $survey should come into $response already being a complete object. But, how do I do that, if I don't know what survey_id to load until I'm in the object? I am revamping a site and the most complex part is littered with this issue. TIA - Hans.

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• How to make Excel strip ALL quotes from CSV text fields

  - by Klay

  When importing a CSV file into Excel, it only strips the double-quotes from the FIRST field on the line, but leaves them on all other fields. How can I force Excel to strip the quotes from ALL strings? For instance, I have a CSV file: "text1", "text2", "numeric1", "numeric 2" "abc", "def", 123, 456 "abc", "def", 123, 456 "abc", "def", 123, 456 "abc", "def", 123, 456 I import it into Excel using Data Import External Data Import Data. I specify that the fields are delimited by commas, and that the text delimiter is the double-quote character. Both the data preview and the actual Excel spreadsheet columns only strip the double-quotes from the first text field. All other text fields still have quotes around them. What's really strange is that Access is able to import this data correctly (i.e. strips quotes from every text field. Note that this is NOT a matter of internal commas or quotes or escape characters. This happens in Excel 2003 and Excel 2007.

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• What is the query string of a BlazeDS request?

  - by dacracot

  I have a Tomcat service running on localhost:8080 and I have installed BlazeDS. I created and configured a simple hello world application like this... package com.adobe.remoteobjects; import java.util.Date; public class RemoteServiceHandler { public RemoteServiceHandler() { //This is required for the Blaze DS to instantiate the class } public String getResults(String name) { String result = “Hi ” + name + “, the time is : ” + new Date(); return result; } } With what query string can I invoke RemoteServiceHandler to my Tomcat instance via just a browser? Something like... http://localhost:8080/blazeds/?xyz

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• htaccess: how to differentiate document requests from variable requests? ... also, how to allow for

  - by Lucas

  hello, my last post was met by smarmy, unhelpful "answers" (comments), so i'll get right to it: if i have and htaccess file like so: RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}.php -f RewriteRule ^(.*)$ $1.php RewriteCond %{REQUEST_FILENAME} -f RewriteRule ^ - [L] RewriteRule ^([^/]+)/([^/]+)$ /index.php?page=$1&subject=$2 RewriteRule ^([^/]+)$ /index.php?page=$1 [L] how can i allow for other url variable names and values to be handled... say for instance i want to add extra unexpected url vars to this scenario /page/subject?urlvar1=value1&urlvar2=value2 and get the page i want without creating unexpected results? any real help is greatly appreciated. thanks!

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• Is it possible for competing file access to cause deadlock in Java?

  - by BlairHippo

  I'm chasing a production bug that's intermittent enough to be a real bastich to diagnose properly but frequent enough to be a legitimate nuisance for our customers. While I'm waiting for it to happen again on a machine set to spam the logfile with trace output, I'm trying to come up with a theory on what it could be. Is there any way for competing file read/writes to create what amounts to a deadlock condition? For instance, let's say I have Thread A that occasionally writes to config.xml, and Thread B that occasionally reads from it. Is there a set of circumstances that would cause Thread B to prevent Thread A from proceeding? My thanks in advance to anybody who helps with this theoretical fishing expedition. Edit: To answer Pyrolistical's questions: the code isn't using Filelock, and is running on a WinXP machine.

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• jQuery Toggle with multiple unique DIVs?

  - by tony noriega

  I am using jQuery toggle with a link and a div. I will eventually have approx. 50 divs i want to toggle, and instead of creating a new function for each one, is there a way i can create a class and have it read unique ID's for each div? (if that makes sense) For instance, i will have A1, A2, A3, B1, B2, B3..e.tc.. $(document).ready(function() { $('#slickbox').hide(); $('a#slick-toggleA1').click(function() { $('#A1').toggle(300); return false; }); });

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• Visual studio winform designer shows design errors as text rather than html

  - by Miki Watts

  All of the sudden, visual studio displays designer errors as plain html text, for example: <DIV id="div1" class="ErrorStyle" width="100%"><span style="font-weight: 600"><br>Object reference not set to an instance of an object. </span><br><a href="" instead of displaying the usual html formatted. I haven't been able to find anything similar to it on google. Before getting this problem, when I tried opening the winform designer, I would get the run/save/cancel dialog of internet explorer for a .tmp file, instead of the designer window. That went away when I found out that I had notepad assigned to the .tmp file type and removed that. Any ideas how to fix this?

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• DataSource for Tomcat web app, Spring and Hibernate

  - by EugeneP

  Web app runs on Tomcat. Datasource is configured with Spring configuration, and is used by Hibernate. If we cannot use JNDI, what would you suggest to use as a DataSource? org.springframework.jdbc.datasource.DriverManagerDataSource will be ok? It's not very good, but sincerely speaking, it can be used on production server, right? Just a bit of headache with too frequent connection reopening. Also, we can use BasicDataSource from Apache. It's much better of course, but here's the question. IF WE DON'T USE JNDI, THEN: If every instance of an app will create its own copy of a DataSource, and every DataSource can have 5 open connections, what do we get? Num_of_running_apps * Num_of_max_active_connections = max active open connection on a DB for this user? Second question: from the perspective of Hibernate, is there any difference about what datasource implementation is used? Will it work with no matter what datasource perfectly and in a stable way?

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• Silverlight MEF Embedded Resources

  - by Fastidious

  I have two different Silverlight UserControls imported with MEF from two different xaps. The UserControls are simply an Image on a Canvas. Both UserControls have the image marked as 'Resource'. The images are different but their names are the same (key point). I'm not quite sure what's going on behind the scenes of the MEF import but both images seem to end up in the same AppDomain. After the composition when I stick the UserControls on a Canvas, each is an instance of the class it should be, but they both show the same image. Obviously if the image file names are unique across all xaps I import I have no problem but I don't like that solution. Is there a better one?

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