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• OO design - car rental

  - by gkid123

  AnHow would you implement the following car hierarchy along with the accessor functions and a CarRental class which contains the container to store them? A car rental company wants to keep track of its cars. Each vehicle has a license plate and a brand. Currently the company has SUV and Sedans. SUV have an optional third row seat, sedan’s have an optional sport package. Each car can be queried to inquire the number of passengers it can carry.

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• IE8 Jquery Javascript "Error: Object required" Bug

  - by thechrisvoth

  IE8 throws an "Error: Object required" message (error in the actual jquery library script, not my javascript file) when the switch statement in this function runs. This code works in IE6, IE7, FF3, and Safari... Any ideas? Does it have something to do with the '$(this)' selector in the switch? Thanks! function totshirts(){ $('.shirt-totals input').val('0'); var cxs = 0; var cs = 0; var cm = 0; $.each($('select.size'), function() { switch($(this).val()){ case "cxs": cxs ++; $('input[name="cxs"]').val(cxs); break; case "cs": cs ++; $('input[name="cs"]').val(cs); break; case "cm": cm ++; $('input[name="cm"]').val(cm); break; } }); }

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• Silverlight DataStateBehavior, initial value not used

  - by JimmySavile

  Hi, I am trying to use the Silverlight DataStateBehavior, it works fine in most cases where I click a button which sets say a 'Selected' Property in the view model to either false or true. The DataStateBehavior then tells the VisualStateManager to go to the relevant state. Like this: <Button...> <i:Interaction.Behaviors> <id:DataStateBehavior Binding="{Binding Selected}" Value="True" TrueState="SelectedVisualState" FalseState="DeselectedVisualState"/> </i:Interaction.Behaviors> </Button> The above works fine. What I am trying to do though is to get it to set the correct state when the application loads, if I were to set the 'Selected' property on the view model to true by default I wouldn't see any changes in the UI until I clicked the button to change the viewmodel property. I know there are several classes involved with the DataState stuff including: BindingListener.cs ConverterHelper.cs DataStateBehavior.cs DataStateSwitchBehavior.cs DataTrigger.cs Any clues would be good, Thanks

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• ASP.NET: Dynamically enable or disable RequiredFieldValidator based on value of DropDownList

  - by Jeremy

  I have an ASP.NET form with three text inputs, one each for "Work Phone", "Home Phone" and "Cell Phone". Each of these text inputs has a RequiredFieldValidator associated with it. I also have a DropDownList where the user can select the preferred phone type. I want to only require the field that is selected in the DropDownList. For example, if the user selects "Work Phone" from the DropDownList, I want to disable the RequiredFieldValidator for "Home Phone" and "Cell Phone", thereby only making the "Work Phone" field required. I have a method that enables and disables these validators based on the value of the DropDownList, but I cannot figure out when to call it. I want this method to run before the validation takes place on the page. How would I do that? Let me know if you need any more information. Thanks.

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• Inner synchronization on the same object as the outer synchronization

  - by Yaneeve

  Recently I attended a lecture concerning some design patterns: The following code had been displayed: public static Singleton getInstance() { if (instance == null) { synchronized(Singleton.class) { //1 Singleton inst = instance; //2 if (inst == null) { synchronized(Singleton.class) { //3 inst = new Singleton(); //4 } instance = inst; //5 } } } return instance; } taken from: Double-checked locking: Take two My question has nothing to do with the above mentioned pattern but with the synchronized block: Is there any benefit whatsoever to the double synchronization done in lines 1 & 3 with regards to the fact that the synchronize operation is done on the same Object?

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• How to eager load in WCF Ria Services/Linq2SQLDomainModel

  - by Aggelos Mpimpoudis

  I have a databound grid at my view (XAML) and the Itemsource points to a ReportsCollection. The Reports entity has three primitives and some complex types. These three are shown as expected at datagrid. Additionally the Reports entity has a property of type Store. When loading Reports via GetReports domain method, I quickly figure out that only primitives are returned and not the whole graph of some depth. So, as I wanted to load the Store property too, I made this alteration at my domain service: public IQueryable<Report> GetReports() { return this.ObjectContext.Reports.Include("Store"); } From what I see at the immediate window, store is loaded as expected, but when returned to client is still pruned. How can this be fixed? Thank you!

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• Cannot Open Shared Object cygmpfr-1.dll

  - by Nathan Campos

  I'm testing CeGCC, that is a gcc built to cross-compile applications to Windows CE devices. As everyone do to test compilers, I've done a Hello World program: #include <stdio.h> int main() { printf("Hello, World!"); return 0; } As I'm using Windows now(because this is my other laptop), I'm using Cygwin. But when I tried to compile I got some errors, as you can see on the terminal log: C:\Dev\WinCE\Testarm-mingw32ce-gcc test.c /opt/mingw32ce/libexec/gcc/arm-mingw32ce/4.4.0/cc1.exe: error while loading shared libraries: cygmpfr-1.dll: cannot open shared object file: No such file or directory C:\Dev\WinCE\Test What can I do?

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• Suggestion on algorithm to distribute objects of different value

  - by Unknown

  Hello, I have the following problem: Given N objects of different values (N < 30, and the values are multiple of a "k" constant, i.e. k, 2k, 3k, 4k, 6k, 8k, 12k, 16k, 24k and 32k), I need an algorithm that will distribute all items to M players (M <= 6) in such a way that the total value of the objects each player gets is as even as possible (in other words, I want to distribute all objects to all players in the fairest way possible). I don't need (pseudo)code to solve this (also, this is not a homework :) ), but I'll appreciate any ideas or links to algorithms that could solve this. Thanks!

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• Value of AppDomain.CurrentDomain.SetupInformation.ConfigurationFile changes based on if the file exi

  - by Dan Neely

  I have a check to make sure the app.config file exists and to report an error if it does not: System.Windows.Forms.MessageBox.Show(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile); if (!File.Exists(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile)) { throw new ConfigurationErrorsException("Unable to find configuration file. File is expected at location: " + AppDomain.CurrentDomain.SetupInformation.ConfigurationFile + "\n"); } When I build the app.config file in my solution is added to the output directory as AppName.exe.config, and if run from outside visual studio AppDomain.CurrentDomain.SetupInformation.ConfigurationFile contains the path C:...\AppName.exe.config (from within VS it's C:..\AppName.vshost.exe.config). If I delete AppName.exe.config, the value is C:..\Appname.config (no .exe). I did a bit of farther experimentation, and if Appname.config exists that file will also work to load my setting values. What's going on here? I need to have everything consistent for error reporting purposes.

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• Passing arguments by value or by reference in objective C

  - by Rafael

  Hello, I'm kind of new with objective c and I'm trying to pass an argument by reference but is behaving like it were a value. Do you know why this doesn't work? This is the function: - (void) checkRedColorText:(UILabel *)labelToChange { NSComparisonResult startLaterThanEnd = [startDate compare:endDate]; if (startLaterThanEnd == NSOrderedDescending){ labelToChange.textColor = [UIColor redColor]; } else{ labelToChange.textColor = [UIColor blackColor]; } } And this the call: UILabel *startHourLabel; (this is properly initialized in other part of the code) [self checkRedColorText:startHourLabel]; Thanks for your help

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• Help with a compiler warning: Initialization from distinct Objective-C type when types match

  - by Alex Gosselin

  Here is the function where I get the compiler warning, I can't seem to figure out what is causing it. Any help is appreciated. -(void)displaySelector{ //warning on the following line: InstanceSelectorViewController *controller = [[InstanceSelectorViewController alloc] initWithCreator:self]; [self.navController pushViewController:controller animated:YES]; [controller release]; } Interface and implementation for the initWithCreator: method -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)creator; -(InstanceSelectorViewController*)initWithCreator:(InstanceCreator*)crt{ if (self = [self initWithNibName:@"InstanceSelectorViewController" bundle:nil]) { creator = crt; } return self; }

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• Cross-platform embedded database/key-value store for C#

  - by Arne Claassen

  I'm looking for a fast, embeddable key/value store with cursor semantics over key collections (or a simple embeddable DB) that I can use in .NET and mono. Need it to be open-source, would prefer an MIT or Apache style license over a GPL license. Not opposed to a library that needs bindings to be written, as long as binaries are available for both windows and linux. Options considered: SQLite - has bindings and native implementation, but single-threaded and not all that fast Embedded InnoDB - no .NET bindings i can find and it's GPLv2 Berkley DB - no .NET bindings i can find Tokyo Cabinet - no .NET bindings i can find and problematic to build on windows MadCow Memory-mapped data structures - GPLv2 Is there an option better than the above that i'm missing, or bindings for the above i don't know about?

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• Changing ActiveRecord attribute value in before_save hook

  - by fifigyuri

  I needed to fix the encoding of an ActiveRecord attribute and decided to do it in a before_save hook. And at this point I noticed an unexpected feature. When I wanted to change the value of the attribute, simple using the attribute_name=XY did not work as I expected. Instead of that I needed to use self[:attribute_name]=XY. So far did not recognise this behaviour and I used AR.attribute_name=XY. What is the reason for this? Does this behaviour relate to the hook or something else? Thanks for explanation.

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• object of type 'closure' is not subsettable - contradiction?

  - by Alex

  I'm writing a function to produce time series plots of stock prices. However, I'm getting the following error "Error in df[, 7] : object of type 'closure' is not subsettable" Here's an example of the function: plot.prices <- function(df) { require(ggplot2) g <- ggplot(df, aes(x= as.Date(Date, format= "%Y-%m-%d"), y= df[, 7])) + geom_point(size=1) # ... code not shown... g } And example data: spy <- read.csv(file= 'http://ichart.finance.yahoo.com/table.csv?s=SPY&d=11&e=1&f=2012&g=d&a=0&b=29&c=1993&ignore=.csv', header= T) plot.prices(spy) # produces error ggplot(spy, aes(x= as.Date(Date, format= "%Y-%m-%d"), y= spy[, 7])) + geom_point(size=1) ## does not produce error As you can see, the code is identical. I get an error if the call to ggplot() is INSIDE the function but not if the call to ggplot() is OUTSIDE the function. Anyone have any idea why the seeming contradiction?

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• C# System.Threading.Timer and its state object

  - by Captain NedD

  I am writing a C# program that uses System.Threading.Timer to timeout on a UDP socket ReceiveAsync call. My program polls a remote device, sending a UDP packet and expecting one in return. I use the timer in one shot mode calling Timer.Change every time I want a new timeout period. For every occurance of a timeout I'd like the timeout handler to have a different piece of information. If I change the object I pass to the Timer on creation it doesn't seem to change when the handler executes. Is the only way to do this to destroy the timer and create a new one? Thanks,

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• UML Class Diagram for User Login

  - by 01010011

  Hi, The diagram below is my very first attempt at creating a UML class diagram describing a user login into a website. I'm sure its a poor design and full of flaws, but I'm hoping to learn from you guys how you would design a simple login like this. I'm particularly interested in your use of design patterns and which patterns you would use, how you would implement it in the design, and why. Any advise, criticisms, comments and suggestions will be really appreciated. Thanks in advance.

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• WSDL Object model

  - by Swaroop

  I'm using the WSDL object model (WOM) along with XSOM for a project of mine. The WOM gives me a way to drill down and look at messages and the message types which are element declarations. However, I am unable to find a way to parse the simple and complex types. The APIs are tricky. There seems to be some kind of a connection between WOM and XSOM. I'd really appreciate it if you could tell me how I can parse the simple and the complex types in my .wsdl file.

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• TortoiseSVN trunk checkout "Server sent unexpected return value (403 Forbidden) in response to OPTIO

  - by S Bogdan

  First of all please excuse my lack of knowledge, I'm new to Tortoise, and my bad English. My problem is that every time I do some operation with an URL like the following one: https://nttt.dttt.com:8443/svn/nttt/Med/trunk I get "Server sent unexpected return value (403 Forbidden) in response to OPTIONS". The user and password I supplied was correct, so no problem there. I don't know where the problem lies, I don't know if it is the server(on witch I don't have any control) or my Tortoise client. Thanks in advance for any answer or guidance.

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• How to extract a Date from an SQLDateTime object in Mathematica

  - by andrews

  I am trying to do a plot of a time series with DateListPlot. I want to feed it a time series I obtain from an SQL database. When I retrieve the time series the list is composed of SQLDateTime entries that DateListPlot doesn't understand. In[24]:= t=SQLExecute[conn, "select timestamp,value from timeseries order by timestamp asc"] Out[24]={{SQLDateTime[{2010,1,1}],12.3},{SQLDateTime[{2010,1,2}],12.51}} Doesn't work: In[25]:= DateListPlot[t] DateListPlot requires a Date tuple and doesn't understand SQLDateTime. What can I do?

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• What topic in computer science is this?

  - by jasonbogd

  Hi, I am trying to figure out what 'topic' this is called, so I can learn more about it. Basically, I'm talking about designing my applications's architecture. I'm not talking about algorithms. More like -- this class should have these methods and these instance variables, and communicate with this class in this way, this class should have these responsibilities etc. Can anybody tell me what the name of this topic is called and how I can get better at doing this? Thanks.

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• Consumed WCF service returns void although return type (& value) specified

  - by Abs

  I have a WCF service that I am attempting to connect to via a console application for testing (although will move to WPF for the final interface). I have generated the proxy, added the service reference to my project in visual studio and I can see all the methods I have created in my WCF interface: SupportStaffServiceClient client = new SupportStaffServiceClient("WSHttpBinding_ISupportStaffService"); client.myMethod(message); However when I call a method, which in the WCF interface is specified as returning a value, the method returns void in the console application. client.getMethod(message); The WCF service method is definitely returning a message, I'm just unsure as to why the client cannot "see" the return.

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• jQuery in sharepoint retruning Object Expected

  - by Simon Thompson

  When I add jquery to sharepoint 2007 (MOSS) and try and use it on a page no matter what I write on the client i get an "object expected" at the line/column where the "$" appears. I have used fiddler to check that the client is downloading the query JS (which it is) But its like its being ignore and therefor eth "$" is not understood. Searching google everybody is saying its the selector not finding the elements but see code below I do not see how it can not find my very simple example. In master page in header <script type="text/javascript" src="jquery.min.js"></script> version 1.4.2 On a page <a href="javascript:abc();">Testing</a> <script> function abc(){ $("#simon").css("border","3px solid red"); } </script> <div id="simon">

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• how to dynamically add observer methods to an Ember.js object

  - by Rick Moss

  So i am trying to dynamically add these observer methods to a Ember.js object holderStandoutCheckedChanged: (-> if @get("controller.parent.isLoaded") @get("controller").toggleParentStandout(@get("standoutHolderChecked")) ).observes("standoutHolderChecked") holderPaddingCheckedChanged: (-> if @get("controller.parent.isLoaded") @get("controller").toggleParentPadding(@get("holderPaddingChecked")) ).observes("holderPaddingChecked") holderMarginCheckedChanged: (-> if @get("controller.parent.isLoaded") @get("controller").toggleParentMargin(@get("holderMarginChecked")) ).observes("holderMarginChecked") I have this code so far but the item.methodToCall function is not getting called methodsToDefine = [ {checkerName: "standoutHolderChecked", methodToCall: "toggleParentStandout"}, {checkerName: "holderPaddingChecked", methodToCall: "toggleParentPadding"}, {checkerName: "holderMarginChecked", methodToCall: "toggleParentMargin"} ] add_this = { } for item in methodsToDefine add_this["#{item.checkerName}Changed"] = (-> if @get("controller.parent.isLoaded") @get("controller")[item.methodToCall](@get(item.checkerName)) ).observes(item.checkerName) App.ColumnSetupView.reopen add_this Can anyone tell me what i am doing wrong ? Is there a better way to do this ? Should i be doing this in a mixin ? If so please

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• wpf binding by selected value - swap out bound object without disturbing binding

  - by Andy Clarke

  Hi, I've got combo box bound to a custom collection type - its basically an overridden ObservableCollection which I've added a facility to update the underlying collection (via Unity). I don't want to confuse the issue too much, but thats the background. My xaml looks like this <ComboBox ItemsSource="{Binding Manufacturers}" DisplayMemberPath="Name" SelectedValuePath="ID" SelectedValue="{Binding Vehicle.ManufacturerID}" /> And in my overridden collection i was doing this. index = IndexOf(oldItem); Insert(index, (T)newItem); RemoveAt(index + 1); I had hoped because it was bound by value, that inserting the new object(which had the same id) and then removing the old one would work. But it seems that although its bound by SelectedValue it still knows that its being swapped for a different one. The combo just looses its selection. Can anyone help please?

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• Determine if getPixel() value is greater than or less than 50% gray

  - by cmal

  I am trying to loop through a bitmap and determine if each pixel is lighter or darker than gray using getPixel(). Problem is, I am not sure how to tell whether the value returned by getPixel() is darker or lighter than gray. Neutral gray is about 0x808080 or R:127, G:127, B:127. How would I need to modify the code below to accurately determine this? for (var dx:int=0; dx < objectWidth; dx++) { for (var dy:int=0; dy < objectHeight; dy++) { if (testBmd.getPixel(dx, dy) > GRAY) { trace("Lighter than gray!"); } else { trace("Darker than gray!"); } } }

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