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• Using LINQ to find a common prefix?

  - by Roger Lipscombe

  I've got two sequences: IEnumerable<string> x = new[] { "a", "b", "c" }; IEnumerable<string> y = new[] { "a", "b", "d", "e" }; I'd like to find the common prefix of these two sequences (i.e. "a", "b"). Is there a succinct way to do this in LINQ? Bear in mind that these aren't really IEnumerable<string>; they're IEnumerable<PathComponent>, where I have an implementation of IEqualityComparer<PathComponent>.

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• Implementing an interface using an asynchronous WCF service?

  - by John K.

  Hello, I am trying to figure out if it is possible to implement a .NET interface, where the interface method has to return something and you are implementing that particular interface method with an asynchronous WCF service? Hopefully you should already see the issue I am encountering. Here is the interface: public interface IDataService { IDataServiceResponse SendDataRequest(); } IDataServiceResponse is supposed to represent a simple container that holds the result of my asynchronous WCF callback. Here is the code snippet where I am implementing the interface method, SendDataRequest() public IDataServiceResponse SendDataRequest() { InitializeDataServiceParameters(); // Call the web service asynchronously, here.... _client.BeginQueryJobs(_parameters, DataServiceQueryCallBack, _client); // How do I return _dataServiceResponse, if I am calling the WCF service // asynchronously?? return _dataServiceResponse; } And the callback method signature: void DataServiceQueryCallBack(IAsyncResult result) { // ... implementation code } Thanks in advance, John

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• C#, DI, IOC using Castle Windsor

  - by humblecoder

  Hi! Am working on a design of a project. I would like to move the implementation away hence to decouple am using interfaces. interface IFoo { void Bar(); void Baz(); } The assemblies which implemented the above interface would be drop in some predefined location say "C:\Plugins" for eg: project: A class A : IFoo { } when compiled produces A.dll project: B class A : IFoo { } when compiled produced B.dll Now I would like to provide a feature in my application to enable end use to configure the assembly to be loaded in the database.say C:\Plugins\A.dll or C:\Plugins\B.dll How it can be achieved using Castle Windsor. container.AddComponent("identifier",load assembly from specified location as configured in DB); I would like to do something like this: IFoo foo =container.Resolve("identifier"); foo.Bar(); //invoke method. Any hint would be highly appreciated. Thanks, Hamed.

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• Mathematica Plot3D does not produce a plot when graphing a user-defined function?

  - by pythonscript

  I'm writing a simple Mathematica implementation of the black-scholes model and using Plot3D to plot the pricing surface. However, when I run this code, no plot is produced. My call and put functions to produce correct values when run separately, but no plot is produced. Code: Clear[d1, d2, call, put, stockPrice, strikePrice, riskFreeRate, timeToExp, volatility] d1[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := (Log[stockPrice / strikePrice] + (riskFreeRate + 0.5*volatility^2)*timeToExp) / (volatility * Sqrt[timeToExp]) d2[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := d1[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility] - volatility*Sqrt[timeToExp] call[stockPrice_, strikePrice_, riskFreeRate_, timeToExp_, volatility_] := stockPrice * CDF[NormalDistribution[0, 1], d1[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility]] - strikePrice * Exp[-riskFreeRate*timeToExp] *CDF[NormalDistribution[0, 1], d2[stockPrice, strikePrice, riskFreeRate, timeToExp, volatility]] Plot3D[call[stockPrice, 500, 0.0030, timeToExp, 0.39], {stockPrice, 10, 1000}, {timetoExp, 0.0833333, 5}] Other plots, like this sample from the reference, do work. Plot3D[{x^2 + y^2, -x^2 - y^2}, {x, -2, 2}, {y, -2, 2}, RegionFunction -> Function[{x, y, z}, x^2 + y^2 <= 4], BoxRatios -> Automatic]

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• drupal's hook_preprocess_page not working as expected

  - by Peter Carrero

  i am having an issue where hook_preprocess_page 's changes to &$variables is not being rendered, even though it is the last item under $theme_registry['page']['preprocess functions']. logging contents of $variables to a file show the contents changed, but contents appear unchanged on the site. flushed all cache on drupal, flushed all browser caches and still the same result. /** * Implementation of hook_preprocess_page(). */ function grinchlist_preprocess_page(&$variables) { if (grinchlist_usercheck($variables['user']['uid'])) { $variables['scripts'] = preg_replace('/<script[^>]*christmas_snow.*<\/script>/','',$variables['scripts']); } file_put_contents('/tmp/vars.txt',print_r($variables,true)); } the /tmp/vars.txt shows the variables properly, but the browser still show the script being loaded. this may be a silly example, but i've had this issue with the hook_preprocess_page in other instances and it would really help out to understand what is going on here... thanks.

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• .NET SettingsProvider/ApplicationSettingsBase caching

  - by Andy White

  I'm looking at some code that uses the .NET System.Configuration.SettingsProvider and ApplicationSettingsBase to handle configuration. We have a class that derives from SettingsProvider that uses a database as the data store, and then we have other settings classes that inherit from ApplicationSettingsBase, and have the [SettingsProvider(typeof(MySettingsProvider))] attribute. The problem is that we're using these settings classes in multiple applications, but they seem to permanently cache the configuration values, the first time they are loaded. The issue is that if a setting is changed in one application, the other applications will not get the setting until the next restart, because they are cached everywhere. My question is: is there a way to force the SettingsProvider implementation, or the classes derived from ApplicationSettingsBase to not cache values, and re-query the datastore every time the setting is accessed? A valid answer might be that these classes were not intended to be used in multi-application environments...

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• How do I write a constant-space length function in Haskell?

  - by Bill

  The canonical implementation of length :: [a] -> Int is: length [] = 0 length (x:xs) = 1 + length xs which is very beautiful but suffers from stack overflow as it uses linear space. The tail-recursive version: length xs = length' xs 0 where length' [] n = n length' (x:xs) n = length xs (n + 1) doesn't suffer from this problem, but I don't understand how this can run in constant space in a lazy language. Isn't the runtime accumulating numerous (n + 1) thunks as it moves through the list? Shouldn't this function Haskell to consume O(n) space and lead to stack overflow? (if it matters, I'm using GHC)

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• JSF 2 -- Composite component with optional listener attribute on f:ajax

  - by Dave Maple

  I have a composite component that looks something like this: <!DOCTYPE html> <html xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:dm="http://davemaple.com/dm-taglib" xmlns:rich="http://richfaces.org/rich" xmlns:cc="http://java.sun.com/jsf/composite" xmlns:fn="http://java.sun.com/jsp/jstl/functions" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:a4j="http://richfaces.org/a4j"> <cc:interface> <cc:attribute name="styleClass" /> <cc:attribute name="textBoxStyleClass" /> <cc:attribute name="inputTextId" /> <cc:attribute name="labelText" /> <cc:attribute name="tabindex" /> <cc:attribute name="required" default="false" /> <cc:attribute name="requiredMessage" /> <cc:attribute name="validatorId" /> <cc:attribute name="converterId" /> <cc:attribute name="title"/> <cc:attribute name="style"/> <cc:attribute name="unicodeSupport" default="false"/> <cc:attribute name="tooltip" default="false"/> <cc:attribute name="tooltipText" default=""/> <cc:attribute name="tooltipText" default=""/> <cc:attribute name="onfail" default=""/> <cc:attribute name="onpass" default=""/> </cc:interface> <cc:implementation> <ui:param name="converterId" value="#{! empty cc.attrs.converterId ? cc.attrs.converterId : 'universalConverter'}" /> <ui:param name="validatorId" value="#{! empty cc.attrs.validatorId ? cc.attrs.validatorId : 'universalValidator'}" /> <ui:param name="component" value="#{formFieldBean.getComponent(cc.attrs.inputTextId)}" /> <ui:param name="componentValid" value="#{((facesContext.maximumSeverity == null and empty component.valid) or component.valid) ? true : false}" /> <ui:param name="requiredMessage" value="#{! empty cc.attrs.requiredMessage ? cc.attrs.requiredMessage : msg['validation.generic.requiredMessage']}" /> <ui:param name="clientIdEscaped" value="#{fn:replace(cc.clientId, ':', '\\\\\\\\:')}" /> <h:panelGroup layout="block" id="#{cc.attrs.inputTextId}ValidPanel" style="display:none;"> <input type="hidden" id="#{cc.attrs.inputTextId}Valid" value="#{componentValid}" /> </h:panelGroup> <dm:outputLabel for="#{cc.clientId}:#{cc.attrs.inputTextId}" id="#{cc.attrs.inputTextId}Label">#{cc.attrs.labelText}</dm:outputLabel> <dm:inputText styleClass="#{cc.attrs.textBoxStyleClass}" tabindex="#{cc.attrs.tabindex}" id="#{cc.attrs.inputTextId}" required="#{cc.attrs.required}" requiredMessage="#{requiredMessage}" title="#{cc.attrs.title}" unicodeSupport="#{cc.attrs.unicodeSupport}"> <f:validator validatorId="#{validatorId}" /> <f:converter converterId="#{converterId}" /> <cc:insertChildren /> <f:ajax event="blur" execute="@this" render="#{cc.attrs.inputTextId}ValidPanel #{cc.attrs.inputTextId}Msg" onevent="on#{cc.attrs.inputTextId}Event" /> </dm:inputText> <rich:message for="#{cc.clientId}:#{cc.attrs.inputTextId}" id="#{cc.attrs.inputTextId}Msg" style="display: none;" /> <script> function on#{cc.attrs.inputTextId}Event(e) { if(e.status == 'success') { $('##{clientIdEscaped}\\:#{cc.attrs.inputTextId}').trigger($('##{cc.attrs.inputTextId}Valid').val()=='true'?'pass':'fail'); } } $('##{clientIdEscaped}\\:#{cc.attrs.inputTextId}').bind('fail', function() { $('##{clientIdEscaped}\\:#{cc.attrs.inputTextId}, ##{clientIdEscaped}\\:#{cc.attrs.inputTextId}Label, ##{cc.attrs.inputTextId}Msg, ##{cc.id}Msg').addClass('error'); $('##{cc.id}Msg').html($('##{clientIdEscaped}\\:#{cc.attrs.inputTextId}Msg').html()); #{cc.attrs.onfail} }).bind('pass', function() { $('##{clientIdEscaped}\\:#{cc.attrs.inputTextId}, ##{clientIdEscaped}\\:#{cc.attrs.inputTextId}Label, ##{cc.attrs.inputTextId}Msg, ##{cc.id}Msg').removeClass('error'); $('##{cc.id}Msg').html($('##{clientIdEscaped}\\:#{cc.attrs.inputTextId}Msg').html()); #{cc.attrs.onpass} }); </script> <a4j:region rendered="#{facesContext.maximumSeverity != null and !componentValid}"> <script> $(document).ready(function() { $('##{clientIdEscaped}\\:#{cc.attrs.inputTextId}').trigger('fail'); }); </script> </a4j:region> </cc:implementation> </html> I'd like to be able to add an optional "listener" attribute which if defined would add an event listener to my f:ajax but I'm having trouble figuring out how to accomplish this. Any help would be appreciated.

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• Programmatically allow write access for a Registry key

  - by Kerido

  Hi everybody, I need to programmatically modify the Access Descriptors on a known Registry key during product installation. The way I want it to work is: The installer is run in Administrative mode. A Registry key is created. A function (the one I need) queries the ACL from the key. If this function finds that the group 'Users' already has write access, nothing should be done. If not, it should add a new permission allowing write access to the 'Users' group. The permissions are saved for the Registry key. This question is similar to Setting Registry key write permissions using .NET, however, I need a C++/Win32 implementation. Thanks in advance

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• WCF hosted in a Web application and compatibility mode

  - by DotnetDude

  I have a WCF service hosted in a web application (IIS). I need to expose 1 end point over wsHttp and the other over netTcp. I am on a IIS7 environment that makes it possible for me to host non HTTP based services. Anyways, when I browse the .svc file using a browser, I get the error: The service cannot be activated because it does not support ASP.NET compatibility. ASP.NET compatibility is enabled for this application By googling, I realized that WCF runs in two modes - Mixed and ASP.NET compatible. When I apply the attribute [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] However, it appears that once I apply this attribute to the Service Contract implementation, I cannot use a non HTTP binding. How do I set it up so that: I can support non HTTP endpoints I can host the service on a Web app I don't create multiple services one with aspnet compatibility turned on and the other turned off

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• Is there any reason to use TFS 2010 in a micro ISV?

  - by kyrisu

  Yesterday I was checking VS2010 editions here and I've noticed that with VS10 with MSDN we get TFS2010 with 1 CAL. I'm a micro ISV (basically sole developer, many clients). I just want to save time - did anyone tried it in similar scenario? Are there any features worth looking into for such a small implementation? P.S. Right now I'm using GIT with gitextension - I'm happy with it, but I would like something more integrated with project management and bug tracking so I can show it to my clients when I'm working on their projects.

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• Generic test suite for ASP.NET Membership/Role/Profile/Session Providers

  - by SztupY

  Hi! I've just created custom ASP.NET Membership, Role, Profile and Session State providers, and I was wondering whether there exists a test suite or something similar to test the implementation of the providers. I've checked some of the open source providers I could find (like the NauckIt.PostgreSQL provider), but neither of them contained unit tests, and all of the forum topics I've found mentioned only a few test cases (like checking whether creating a user works), but this is clearly not a complete test suite for a Membership provider. (And I couldn't find anything for the other three providers) Are there more or less complete test suites for the above mentioned providers, or are there custom providers out there that have at least some testing avaialable?

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• Show last command with up arrow on a linux c shell

  - by nunos

  I have implemented a simple linux shell in c. Now, I am adding some features and one I immediately thought about was to be able to show the last commands with the up arrow. Question 1: However, I have no idea how to accomplish this. Do you? Question 2: Any comment on how to store the "history" commands are also appreciated. I suppose something like a queue which allows access to all elements would be a good idea. Am I wrong? Do I have to implement it or is there already some good implementation out there I should know about? Thanks.

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• NoSql Crash Course/Tutorial

  - by Chris Thompson

  Hi all, I've seen NoSQL pop up quite a bit on SO and I have a solid understanding of why you would use it (from here, Wikipedia, etc). This could be due to the lack of concrete and uniform definition of what it is (more of a paradigm than concrete implementation), but I'm struggling to wrap my head around how I would go about designing a system that would use it or how I would implement it in my system. I'm really stuck in a relational-db mindset thinking of things in terms of tables and joins... At any rate, does anybody know of a crash course/tutorial on a system that would use it (kind of a "hello world" for a NoSQL-based system) or a tutorial that takes an existing "Hello World" app based on SQL and converts it to NoSQL (not necessarily in code, but just a high-level explanation). I see this having one solid answer, but if you guys feel like it should be community wiki, I'll be happy to change it. Thanks! Chris

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• iPhone switch statement using enum

  - by Boris

  I have defined an enum in a header file of a class : typedef enum{ RED = 0, BLUE, Green } Colors; - (void) switchTest:(Colors)testColor; and in the implementation file I have : - (void) switchTest:(Colors)testColor{ if(testColor == RED){ NSLog(@"Red selected"); } switch(testColor){ case RED: NSLog(@"Red selected again !"); break; default: NSLog(@"default selected"); break; } } My code compiles correctly without warrnings. When calling the switchTest method with RED, the output is : "Red selected" but once the first line of the switch runs, the application quits unexpectedly and without warrnings/errors. I don't mind using if/else syntax but I would like to understand my mistake.

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• Java framework "suggestion" for persisting the results from an Oracle 9i stored procedure using Apac

  - by chocksaway

  Hello, I am developing a Java servlet which calls an Oracle stored procedure. The stored procedure is likely to "grow" over time, and I have concerns the amount of time taken to "display the results on a web page". While I am at the implementation stage, I would like some suggestions of a Persistence framework which will work on Apache Tomcat 5.5? I see two approaches to persisting the database results. A scheduled database query every N minutes, or something which utilises triggers. Hibernate seems like the obvious answer, but I have never called stored procedures from Hibernate (HQL and Criteria). Is there a more appropriate framework which can be used? Thank you. cheers Miles.

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• Examining mmaped addresses using GDB

  - by Mikeage

  I'm using the driver I posted at http://stackoverflow.com/questions/647783/direct-memory-access-in-linux/ to mmap some physical ram into a userspace address. However, I can't use GDB to look at any of the address; i.e., x 0x12345678 (where 0x12345678 is the return value of mmap) fails with an error "Cannot access memory at address 0x12345678". Is there any way to tell GDB that this memory can be viewed? Alternatively, is there something different I can do in the mmap (either the call or the implementation of foo_mmap there) that will allow it to access this memory? Note that I'm not asking about /dev/mem (as in the first snippet there) but amount a mmap to memory acquired via ioremap(), virt_to_phys() and remap_pfn_range()

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• Geocoding autocomplete bias not working

  - by chris

  I'm using the following code to get the autocomplete functionality for an address input box using Google Maps API v3: function initializeAutocomplete() { var defaultBounds = new google.maps.LatLngBounds( new google.maps.LatLng(1.484016,103.575212), new google.maps.LatLng(1.233592,104.033618)); var input = document.getElementById('destStreet'); var myOptions = {bounds: defaultBounds, types: ['geocode']}; autocomplete = new google.maps.places.Autocomplete(input, myOptions); } The problem is that biasing doesn't seem to work as the first results are usually not relevant to the defined bounds (a country). I've seen a few apps working fine, so I'm wondering where the problem is. I came across the JQuery autocomplete plugin (http://code.google.com/p/geo-autocomplete/) which would seem like a good alternative since it has a region filter, but I'm unable to "install it" or use it because of my very limited knowledge (I learn by example). Could you please help me getting more relevant results with the above code or guide me through the implementation of the JQuery alternative? Of course I'm very open to other suggestions as well.

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• iPhone: error: request for member 'table' in something not a structure or union

  - by Jack Griffiths

  Hi there, When it comes to compiling my application, I get the error mentioned in the title. How would I go about remedying this error? Basically, I want to get from one table to the other. Hierarchy, navigation. NextViewController.m #import "RootViewController.h" #import "NextViewController.h" @implementation NextViewController - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview // Release anything that's not essential, such as cached data } - (void)dealloc { [super dealloc]; } - (IBAction) changeTable:(NSString *)str{ tblCSS.table = str; } The last line contains the error. If you need any more code, just ask. I'll amend this post with it. Cheers, Jack

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• xerces serialization in Java 6

  - by Jim Garrison

  In Java 6, the entire xerces XML parser/serializer implementation is now in the Java runtime (rt.jar). The packages have been moved under the com.sun.* namespace, which places them off-limits for explicit reference within client code. This is not a problem when using the parser, which is instantiated via javax API-defined factories. However, our code also uses xerces serialization (org.apache.xml.serialize.* ). AFAICT, there are no javax.xml API-defined factories for creating instances of Serializer and OutputFormat. This seems to imply that the only way to get one is to explicitly call the com.sun.org.apache.xml.serialize.* APIs. I've found the serialization classes in javax.xml.stream, but they don't seem to provide any output-formatting control like the xerces OutputFormat class. Question: Is there a way to access the xerces serialization functionality (which is in rt.jar) via a javax standard API, without including xerces.jar and also without explicitly instantiating com.sun.* classes? If not, is there an javax API-compliant way to achieve the same effect?

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• Netbeans-esque retrospective auto-comment/phpDocumentor tool (for Eclipse or standalone)

  - by Andy

  Is there anything similar to netbean's Javadoc auto comment tool for PHP/phpDocumentor/Eclipse? In the netbeans implementation: A dialog pops up and allows you to run through all the members of your class and enter comments, which are added to the source file. It even verifies that there are no parameters you have not accounted for, so you can be sure that your comments are complete. Ideally this would be standalone software, but plugins are OK too :) p.s. netbeans 6+ auto comment was moved/renamed. Now in "Tool-Options", Tab: "Java Code", Javadoc: "Hints" edit: screengrab of the original Netbeans tool:

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• Self-type mismatch in Scala

  - by Alexey Romanov

  Given this: abstract class ViewPresenterPair { type V <: View type P <: Presenter trait View {self: V => val presenter: P } trait Presenter {self: P => var view: V } } I am trying to define an implementation in this way: case class SensorViewPresenter[T] extends ViewPresenterPair { type V = SensorView[T] type P = SensorPresenter[T] trait SensorView[T] extends View { } class SensorViewImpl[T](val presenter: P) extends SensorView[T] { presenter.view = this } class SensorPresenter[T] extends Presenter { var view: V } } Which gives me the following errors: error: illegal inheritance; self-type SensorViewPresenter.this.SensorView[T] does not conform to SensorViewPresenter.this.View's selftype SensorViewPresenter.this.V trait SensorView[T] extends View { ^ <console>:13: error: type mismatch; found : SensorViewPresenter.this.SensorViewImpl[T] required: SensorViewPresenter.this.V presenter.view = this ^ <console>:16: error: illegal inheritance; self-type SensorViewPresenter.this.SensorPresenter[T] does not conform to SensorViewPresenter.this.Presenter's selftype SensorViewPresenter.this.P class SensorPresenter[T] extends Presenter { ^ I don't understand why. After all, V is just an alias for SensorView[T], and the paths are the same, so how can it not conform?

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• Exceptions and web services

  - by Schildmeijer

  Im using the standard java ws implementation shipped with e.g. java6 (javax.jws.*). I have the following: import javax.jws.*; @WebService(name="Widget") public interface Widget { @WebMethod public @WebResult String getGadget(@WebParam(name = "id") long id) throw MyOwnException; } Is this possible? Do I have to annotate MyOwnException with e.g the @WebFault annotation? During my initial tests I also noticed that, on the client side, the autogenerated MyOwnException was renamed to MyOwnException_Exception and wrapped the "original" MyOwnException. Or if this is a bad idea, are there any recommended Exceptions to throw from a webservice like this?

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• Pure Java open-source libraries for portfolio selection (= constrained, non-linear optimization)?

  - by __roland__

  Does anyone know or has experience with a pure Java library to select portfolios or do some similar kinds of quadratic programming with constraints? There seems to be a lot of tools, as already discussed elsewhere - but what I would like to use is a pure Java implementation. Since I want to call the library from within another open-source software with a BSD-ish license I would prefer LGPL over GPL. Any help is appreciated. If you don't know such libraries, which is the most simple algorithm you would suggest to implement? It has to cope with an inequality constraint (all x_i = 0) and an equality constraint (sum of all x_i = 1).

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• Is there a SortedList<T> class in .net ? (not SortedList<Key,Value> which is actually a kind of Sort

  - by Brann

  I need to sort some objects according to their contents (in fact according to one of their properties, which is NOT the key and may be duplicated between different objects) .net provides two classes (SortedDictionnary and SortedList), and both are some kind of Dictionaries. The only difference (AFAIK) is that SortedDictionnary uses a binary tree to maintain its state whereas SortedList does not and is accessible via an index. I could achieve what I want using a List, and then using its Sort() method with a custom implementation of IComparer, but it wouldn't be time-efficient as I would sort the whole List each time I insert a new object, whereas a good SortedList would just insert the item at the right position. What I need is a SortedList class with a RefreshPosition(int index) to move only the changed (or inserted) object rather than resorting the whole list each time an object inside changes. Am I missing something obvious ?

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