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• Storing and comparing biometric information

  - by Chathuranga Chandrasekara

  I am not sure whether this is the best place to post this. But this is strongly related with programming so decided to put this here. In general we use biometrics in computer applications say for authentication. Lets get 2 examples finger prints and facial recognition. In those cases how we keep the information for comparison. As an example we can't keep a image and process it every time. So what are the methodologies we use to store/determine the similarity in such cases? Are there any special algorithms that designed for that purposes.? (Ex : To return a approximately equal value for a finger print of a certain person every time)

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• Are document-oriented databases meant to replace relational databases?

  - by evolve

  Recently I've been working a little with MongoDB and I have to say I really like it. However it is a completely different type of database then I am used. I've noticed that it is most definitely better for certain types of data, however for heavily normalized databases it might not be the best choice. It appears to me however that it can completely take the place of just about any relational database you may have and in most cases perform better, which is mind boggling. This leads me to ask a few questions: Are document-oriented databases have been developed to be the next generation of databases and basically replace relational databases completely? Is it possible that projects would be better off using both a document-oriented database and a relational database side by side for various data which is better suited for one or the other? If document-oriented databases are not meant to replace relational databases, then does anyone have an example of a database structure which would absolutely be better off in a relational database (or vice-versa)?

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• Hooks...exactly what they are

  - by Ygam

  I have seen hooks in Kohana PHP framework, and they work as some sort of a callback function triggered by a certain event (Kohana's events that is, some sort of method overloading). I have seen hooks in Wordpress, and I don't know what they are or how to use them (just saw them yesterday). I'm looking for events in "non-frameworked" php, I cannot find ones. Do hooks work only in an "event-based" environment? What are they anyway (in general, not just in PHP)? What are they good for if not in an "event-based" environment.

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• Is it possible to use best_in_place with typeahead from twitter bootstrap?

  - by Dave H

  Basically, I am using best_in_place in my rails webapp to let users edit their profile info in place. The thing is, I would like users to be presented with a typeahead form for certain entries.. Here's what I'm working with: <p>College/University: <input type="text" class="span3" style="margin: 0 auto;" data-provide="typeahead" data-items="8" data-source='["University of Pennsylvania","Harvard","Yale","Princeton","Cornell","Brown","Columbia","Dartmouth"]'></p> This gives me a working form box with typeahead. However, I want to be able to wrap this in best_in_place with something like <%= best_in_place @student, :education %> so that users only see the typeahead form when they click on the text, and upon clicking away from the box or hitting enter the selection is stored in the database. Is there a reasonably easy way to do this?

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• Consuming an iCal/.ics file in YQL

  - by Josh

  How would one consume an iCal/.ics file in YQL? Given an .ics such as: http://www.hebcal.com/export/ba/8a35a5efbb27548bc0272b94b8de96.ics?subscribe=1&v=1&year=2010&month=x&nh=on&tag=fp.ql&c=off How would I go about using YQL to select certain events based on fields, etc. I've tried the standard formats, and the only format that seems to even parse the file is HTML - which puts it all in a <p>, and removes the line returns that give the file meaning. I've had some success with using Yahoo Pipes' Fetch Feed Source, but was wondering if it's possible to do this entirely in YQL. Any ideas?

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• SSRS 2005 - Usability analysis - Is SSRS a good option for this scenario?

  - by Sach

  How practical is it to consider SSRS 2005 or SSRS 2008 as a reporting solution for a report that has to show reports with millions of records (records vary from 3 to 10 million)? Is there any threshold on the size of report in SSRS? How do I know that for a huge report, wheather SSRS will consume the whole memory and start paging the operations to disk or it will give a memory leak error? Even if I keep on increasing the memory how can I be sure that certain memory will be sufficient for such huge reports for the report server? All the above questions are haunting me because I have a dedicated report server with a decent hardware and OS configuration (8 processors, 8GB RAM, 64 bit OS and 64 bit SQL Server 2005). Still my report with around 2 million records is taking more than 6 minutes and going from one page to another takes 3 minutes!!! My datasource is on separate server and when I execute only the stored proc there, it returns the results in less than 2 minutes.

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• ASP.NET MVC: ModelState vs. ModelStateDictionary

  - by Alex

  Hello, I have a service which has a method that's called when a certain controller method is triggered. My service returns a custom result object PlacementResult in which I want to communicate errors that may have happened (validation) back to the controller method. Should PlacementResult have a ModelState or a ModelStateDictionary to communicate errors back to the controller (and finally view)? How would I string this together? Finally, how do I get the ModelState/ModelStateDictionary (whichever you tell me I should choose) back into the view (highlighting the appropriate text box, show the error message etc.)? Thank you !

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• NativeWindow WndProc not receiving messages

  - by BadNinja

  Could someone shed some light on why my WndProc method as implemented below isn't receiving any messages? If I put this class below in a WinForms application and pass in that application's handle, WndProc receives messages as I would expect. However, using the IntPtr returned from GetForegroundWindow() as I have below doesn't yield the same results. (FWIW, I have my code set up to execute GetForegroundWindow() when my application is hidden, so I'm certain that the IntPtr is referring to an outside application.) public class MyNativeWindow : NativeWindow { [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)] private static extern IntPtr GetForegroundWindow(); public MyNativeWindow() { this.AssignHandle(GetForegroundWindow()); } // Never called... I set a breakpoint [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] protected override void WndProc(ref Message m) { base.WndProc(ref m); } }

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• Linq - How to query specific columns and return a lists

  - by Billy Logan

  Hello Everyone, I am trying to write a linq query that will only return certain columns from my entity object into a list object. Below is my code which produces an error(can't implicitly convert a generic list of anonymous types to a generic list of type TBLPROMOTION): List<TBLPROMOTION> promotionInfo = null; promotionInfo = (from p in matches orderby p.PROMOTION_NM descending select new { p.EFFECTIVE_DT, p.EXPIRE_DT, p.IS_ACTIVE, p.PROMOTION_DESC, p.PROMOTION_ID, p.PROMOTION_NM }).ToList(); What would be the best way to accomplish this. I do not want to do a "select p" in this case and return all the columns associated with the query. thanks in advance, Billy

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• Resources to learn sh scripting 'just like a normal programming language'

  - by Homer J. Simpson

  Hi, what is the best resource (book would be nice) to learn sh scripting (the "standard" shell on Unix systems) just like when i would learn a "normal" programming/scripting language ? There are lots of tutorials on certain aspects of shell scripting, they mostly deal with shells in general and unix commands and so on, but i would rather like to find a more general approach - meaning a quick syntactic overview and an outlook on how to do things you normally do when programming, like implementing small algorithms and so on. Doing actual scripting, not just a structured batch file. And rather 100-liners than 1-to-3-liners. Can you recommend a good standard book on the topic ?

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• ASP.NET MVC <OutputCache> SqlDependency (CommandNotification?) with LINQ queries

  - by sinni800

  Hello, I use LINQ queries in my ASP.NET MVC application and want to use OutputCache in some of my Actions. I hear this should be possible with CommandNotifications. But those seem to only go for self-created SQLCommands, or am I wrong? Can I manually tell SQL server to send SQLDependency notifications if certain tables change? And if yes, how can I attach them to the OutputCache? Another side question: Can you do this with strongly types views too? Thank you in advance...

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• Using IIRF to redirect to a PDF

  - by Michael Itzoe

  I'm using IIRF to redirect certain URLs to specific PDF files. For instance, for the URL /newsletter/2010/02 I'd like it to redirect to /pdf/newsletters/Feb2010.pdf. I'm not too hot at regular expressions, but I created the following rule: RedirectRule ^/newsletter/2010/01 /pdf/newsletters/Newsletter012010.pdf [I,R=301] and it does redirect, but the address bar doesn't change, and when trying to save the file it wants to save as 01 instead of Feb2010.pdf. I don't presume my users will be savvy enough to enter a PDF extension before saving, and they shouldn't have to. Is there anything I can do about this?

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• Merging deletes in a Team Foundation Server baseless merge

  - by Justin Dearing

  I have two TFS branches that do not have a direct parent/child relationship in TFS. In a certain revision, 94 in my example, several items were deleted. I have been tasked with applying those deletes to the main branch. I'd like to do so through a baseless merge. I tried the following command to do so: tf merge /baseless /recursive /version:94 .\programs\program1 ..\Release\programs\program1 Most of the items in the tree were marked as "merge", and some were marked as "merge edit". However, none of the items were deleted at the destination. On a whim i tried to merge over a single delete like so: tf merge /baseless /recursive /version:94 .\programs\program1\source1.cs ..\Release\programs\program1\source1.cs I got the following error message: The item [TFS_PATH] does not exist at the specified version. How do I do this? Is there a way to avoid making all those deletes myself?

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• Basic Ruby on Rails Question about routing

  - by Acidburn2k

  I have a controller without any related model. This controller is to span some informations from various models. I have lots of actions there, which define certain views on the page. What would be the best way to organize routes for this controller. What I would like is to have /dashboard/something point to any action in the dashboard controller. Not actions like new/edit but arbitrary (showstats, etc). With trail and error I made something like this: map.dashboard 'dashboard/:action', :controller => 'dashboard', :action => :action Now it is possible to access those url using helper: dashboard_url('actionname') This approch seems to be working ok, but is this the way to go? I am not quite sure understand, how are the helper method names generated. How to generate same helper names as in basic controllers "action_controller_url" ? That would be more generic and made the code more consistent. Thanks in advance.

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• Trying to understand Java Classloading

  - by Jens

  Hello, I'm currently getting to know Java and OSGi, so I've read a few books. In one particular book the class loading is described. You can download it (free and legal) from the authors page (Neil Bartlett): OSGi Book On page 9 and 10 are this pictures: It seems like there is the possibility that our class "Foo" won't use the class "Bar" of foobar.jar, but instead class "Bar" from naughty.jar. Because of the flat and global structure of the Java classpath this could be, but as far as I know you would define a package from where you want to import a certain class: import foobar.Bar This should prevent loading the wrong class, shouldn't it? Of course assuming that the package is called "foobar".

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• [WPF C#]Get UserControl or VisualTree in DataValidation of TextBlock

  - by dalind

  Hy, I have a validator set on the text property of a textblock. For a correct validation I would need the parent usercontrol of the textblock, but the only things I have in the validator are the value object (a string) and the culture (doesn't help either). Does anyone know a way to get certain usercontrols in a class/a method where I have no access to any kind of visual or control of my application. The problem could be solve if I could give the validator the usercontrol or the textblock as parameters, but I didn't find a way to do so.. Thank you very much for your answers. Greets

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• Algorithm to detect no movable pieces in Stratego.

  - by maleki

  I am creating a Stratego Game and am having trouble creating an algorithm that can detect when there are no more possible moves because all your pieces are gone or the remaining pieces are unmovable or trapped by forbidden squares, unmovable pieces, or other trapped pieces. For simplicity you can think of the board as an array of Squares which can contain pieces. Square[][] gameBoard = new Square[10][10] Squares have easily checkable state such as hasPiece(), hasEnemyPiece(), hasUnMovablePiece(), hasMoveablePiece(), isBlocked(). It would also probably be nice if this algorithm wasn't run every time a player moved but maybe checked in the beginning and then only certain conditions were checked when the player moved.

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• Subsonic 3.0 Query limit with MySQL c#.net LinQ

  - by omegawkd

  Hello, a quick question which may or may not be easily answered. Currently, in order to return a limited result set of data to my calling reference using SubSonic I use a similar function as below: _DataSet = from CatSet in t2_aspnet_shopping_item_category.All() join CatProdAssignedLink in t2_aspnet_shopping_link_categoryproduct.All() on CatSet.CategoryID equals CatProdAssignedLink.CategoryID join ProdSet in t2_aspnet_shopping_item_product.All() on CatProdAssignedLink.ProductID equals ProdSet.ProductID where ProdSet.ProductID == __ProductID orderby CatProdAssignedLink.LinkID ascending select CatSet; and select the first item from the data set. Is there a way to limit the lookup initially to a certain amount of rows? I'm using MySQL as the base database.

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• NHibernate illegal access to loading collection error

  - by Rob

  I'm getting the error "Illegal acces to loading collection" when i'm trying to get a list of variants belonging to a certain product. The NHibernate mapping is as below; <list name="Variants" lazy="false" cascade="save-update" inverse="false" table="PluginProduct_ProductVariant"> <key column="ProductId" /> <index column="Ordinal" /> <one-to-many class="Plugin.Product.Business.Entities.Variant, Plugin.Product" /> </list> </joined-subclass> I already tried chancing the laziness and inverse properties as suggested in other topics on this site, but they didn't do the trick.

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• Filtering MySQL query result according to a interval of timestamp

  - by celalo

  Let's say I have a very large MySQL table with a timestamp field. So I want to filter out some of the results not to have too many rows because I am going to print them. Let's say the timestamps are increasing as the number of rows increase and they are like every one minute on average. (Does not necessarily to be exactly once every minute, ex: 2010-06-07 03:55:14, 2010-06-07 03:56:23, 2010-06-07 03:57:01, 2010-06-07 03:57:51, 2010-06-07 03:59:21 ...) As I mentioned earlier I want to filter out some of the records, I do not have specific rule to do that, but I was thinking to filter out the rows according to the timestamp interval. After I achieve filtering I want to have a result set which has a certain amount of minutes between timestamps on average (ex: 2010-06-07 03:20:14, 2010-06-07 03:29:23, 2010-06-07 03:38:01, 2010-06-07 03:49:51, 2010-06-07 03:59:21 ...) Last but not least, the operation should not take incredible amount of time, I need this functionality to be almost fast as a normal select operation. Do you have any suggestions?

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• How do I automate navigation to a website that requires authentication?

  - by Wiz

  Here's what I'm trying to achieve. I would like to write a script that will navigate to a website that requires me to be authenticated as myself, say Facebook, Live Spaces, Twitter or any other, and then have that script search for certain information on one of the pages of the website. I've done something similar in the past with the Windows.Forms WebBrowser control, which is a full blown implementation of IE that can be controlled through code and will store whatever cookies you get once you're authenticated, but it was very unfriendly to modify and I was hoping to use a scripting language instead, maybe Powershell or something of that sort. Are there maybe some good tutorials about this out there on the web? Thanks!

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• c# XML add an XML node as a child to a particular other node

  - by kacalapy

  I have an XML doc with a structure like this: <Book> <Title title="Door Three"/> <Author name ="Patrick"/> </Book> <Book> <Title title="Light"/> <Author name ="Roger"/> </Book> I want to be able to melodramatically add XML nodes to this XML in a particular place. Lets say I wanted to add a Link node as a child to the author node where the name is Roger. I think it's best if the function containing this logic is passed a param for the name to add an XML node under, please advise and what's the code I need to add XML nodes to a certain place in the XML? Now I am using .AppendChild() method but it doesn't allow for me to specify a parent node to add under...

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• iPhone + AdMob + remove the Ad view

  - by pratik

  Hello, I have integrated AdMob in my iPhone application. I am adding an Ad view in of my UIViewController as follows: ProgrammaticAdViewController *temp = [[ProgrammaticAdViewController alloc] init]; temp = [[ProgrammaticAdViewController alloc] initWithNibName:nil bundle:nil]; [self.view addSubview:temp.view]; So, I will be able to see an Ad view on top of my UIViewController. Now I have two problems: I am not able to tap on certain buttons of my UIViewController on which I have added the Ad View. So, for temporary purpose I adding the Ad view as: [self.view insertSubView:temp.view atIndex:1]; I want to remove the Ad view after sometime so I am using: [temp.view removeFromSuperView]; But my Ad view is not being removed. Please help me. Regards, Pratik

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• Map API with Building Elevation Data

  - by Laserallan

  Hi! I'm looking for a map API where I can get detailed elevation for points. I'm not looking elevation differences for certain paths along roads on the map but actual building heights. Getting the the 3d meshes for buildings would also be fine since I can compute the height myself using that information. Does any of the map API's out there support giving out this kind of information? EDIT: Free API's are preferred but if that's not an option I'd like to hear about non free alternatives as well.

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• Maven SVN checkout example

  - by c0mrade

  Concerning my previous question - http://stackoverflow.com/questions/2622191/is-there-a-svn-maven , I went trough usage page - http://maven.apache.org/scm/maven-scm-plugin/usage.html didn't found quite what I was looking for, here what I would like to do : Checkout list of projects which I specify for ex : http://mysvnurl/myprojectname where I could parametrize the project name Then lets say if there is 3-4 or n number of sub-projects(modules)(for which I can specify the names as well) that I want to checkout, and that I could specify branch(trunk) and revision. To simplify : Checkout certain sub-projects(modules) trunk of myprojectname Ex : http://mysvnurl/myprojectname/project1/trunk/* // get everything http://mysvnurl/myprojectname/project2/trunk/* // get everything How would I do that with maven, can someone with more expirience explain how to do this or point me to somewhere where I can read how to, I've googled nothing specific to my needs. Thank you

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