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• vs2010: trying to debug javascript using Chrome: this is not a valid location for a breakpoint

  - by George

  Everytime I try to set a debug point in Javascript, eietehr while in Design mode or while runniong, I get the error: trying to set a breakpoint in javascript: this is not a valid location for a breakpoint When I go to VS2010's Options screen under Debugging Just In Time, I see that Managed, Native & Script are selected, I also placed the line "debugger;" in the first line of a javascript function that is called but the break is never hit. In the Web.Config (although this is probably for compiled code:): <compilation debug="true I'm reliving this problem on a new machine...Can u help? Edit: I left out a huge detail: Google Chrome is my default browser. (I am trying to debug a Chrome-only error.) Must I resort to other debug tools other than VS2010? I am thinking that it should work. Too hopeful, eh?

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• Why does calling setScaleX during pinch zoom gesture cause flicker?

  - by numan

  I am trying to create a zoomable container and I am targeting API 14+ In my onScale (i am using the ScaleGestureDetector to detect pinch-zoom) I am doing something like this: public boolean onScale (ScaleGestureDetector detector) { float scaleFactor = detector.getScaleFactor(); setScaleX(getScaleX() * scaleFactor); setScaleY(getScaleY() * scaleFactor); return true; }; It works but the zoom is not smooth. In fact it noticeably flickers. I also tried it with hardware layer thinking that the scaling would happen on the GPU once the texture was uploaded and thus would be super fast. But it made no difference - the zoom is not smooth and flickers weirdly sometimes. What am I doing wrong?

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• Facebook connect - api_client->users_getInfo throws error Cannot use string offset as an array

  - by Gublooo

  Hey guys I have this piece of code which works 90% of the time: $user_details=$fb-api_client-users_getInfo($fb_user, array('last_name','first_name','proxied_email')); $firstName=$user_details[0]['first_name']; But sometimes I get this error: Fatal error: Cannot use string offset as an array for line $firstName=$user_details[0]['first_name']; I have read several people report the same issue - but I'm still not clear as to what is the reason - Am I getting this error because facebook is not returning any results or am I getting because it is returning only a single array instead of array of arrays. This is the fix I'm thinking of: if (!is_array($user_details)) { $firstName=''; } else { $firstName = ($user_details[0]) ? $user_details[0]['first_name'] : $user_details['first_name']; } Also if I'm not getting the name - is it because of a timeout issue or something else? Thanks

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• Create an XML file using Datasets Using info from XML Schema

  - by Voulnet

  Hello there, I have been thinking about the optimal way to create an XML file using data from a Dataset AND according to the rules of an XML schema. I've been searching around for a bit, and I failed to find a way in which I only take the data from the Dataset and put it inside a XML tags, with the tags being defined by an already-existing schema. So it might go like this: 1- Create Dataset and fill its rows with data. 2- Create an XML according to an XML schema rules. 3- Fill said XML file with data from Dataset such that data is taken from the Dataset while structure of the XML file is taken from the XML schema.

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• Create a subarray reference in C# (using unsafe ?)

  - by Wam

  Hello there, I'm refactoring a library we currently use, and I'm faced with the following problem. We used to have the following stuff : class Blah { float[][] data; public float[] GetDataReference(int index) { return data[index]; } } For various reasons, I have replaced this jagged array version with a 1 dimensionnal array version, concatenating inner arrays. My question is : how can I still return a reference to a sub array of data ? class Blah { float[] data; int rows; public float[] GetDataReference(int index) { // Return a reference data from offset i to offset j; } } I was thinking that unsafe and pointers stuff may be of use, is it doable ?

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• Way to concat strings when using binding in Silverlight

  - by Artur

  I wonder if there is a way of concating two strings in Silverlight inside xaml file. I have a DataGrid where one of the columns is 'Default Contact' and I would like to represent data in there as first and last name. <sdk:DataGridTextColumn Header="Default Contact" Binding="{Binding Path=DefaultContact.FirstName}" /> I was thinking about something like: Binding="{Binding Path=DefaultContact.FirstName + " " + DefaultContact.LasttName}" But this doesn't work. I don't even know if this is possible to achieve. Seems like really basic thing so I hope it is supported in some way. Any help would be greatly appreciated.

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• Machine learning challenge: diagnosing program in java/groovy (datamining, machine learning)

  - by Registered User

  Hi All! I'm planning to develop program in Java which will provide diagnosis. The data set is divided into two parts one for training and the other for testing. My program should learn to classify from the training data (BTW which contain answer for 30 questions each in new column, each record in new line the last column will be diagnosis 0 or 1, in the testing part of data diagnosis column will be empty - data set contain about 1000 records) and then make predictions in testing part of data :/ I've never done anything similar so I'll appreciate any advice or information about solution to similar problem. I was thinking about Java Machine Learning Library or Java Data Mining Package but I'm not sure if it's right direction... ? and I'm still not sure how to tackle this challenge... Please advise. All the best!

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• Component based game engine design

  - by a_m0d

  I have been looking at game engine design (specifically focused on 2d game engines, but also applicable to 3d games), and am interested in some information on how to go about it. I have heard that many engines are moving to a component based design nowadays rather than the traditional deep-object hierarchy. Do you know of any good links with information on how these sorts of designs are often implemented? I have seen evolve your hierarchy, but I can't really find many more with detailed information (most of them just seem to say "use components rather than a hierarchy" but I have found that it takes a bit of effort to switch my thinking between the two models). Any good links or information on this would be appreciated, and even books, although links and detailed answers here would be preferred.

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• Implementing automatic logout in silverlight and wcf due to user inactivity

  - by rubin-attack

  I have a WCF web-service and a Silverlight app displaying data from that service. In my service I'd like to implement automatic logout of the user, if no service methods were invoked during a period of time (for example 20 minutes). I'm thinking about smth like that: Dictionary<User,TimeSpan> Inactivity When a service method is invoked i reset the TimeSpan. But what will happen, if 20 minutes pass, and I call the Logout method (which clears all User caches), and suddenly the User returns from lunch)) and presses a button in his Silverlight app? Obviously he'll get an error. Is there any way to avoid this, or all my concept is wrong? Maybe there's a better way to logout the user automatically?

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• How to determine if binary tree is balanced?

  - by user69514

  It's been a while from those school years. Got a job as IT specialist at a hospital. Trying to move to do some actual programming now. I'm working on binary trees now, and I was wondering what would be the best way to determine if the tree is height-balanced. I was thinking of something along this: public boolean isBalanced(Node root){ if(root==null){ return true; //tree is empty } else{ int lh = root.left.height(); int rh = root.right.height(); if(lh - rh > 1 || rh - lh > 1){ return false; } } return true; } Is this a good implementation? or am I missing something?

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• ASP.NET MVC authentication for iPhone application

  - by manu08

  This is for an ASP.NET MVC application. For browser based access on my normal controllers, I'm using standard forms authentication and auth cookies. My question is how I do the same for an iPhone application. I have a set of RESTful controllers that the iPhone application uses directly, but I'm not sure how to go about authentication... I was thinking of having a special Login method that returns the auth cookie. Then I can use the standard Authentication attribute on the ASP.NET MVC side, but I'm not sure how to handle this on the iPhone side? Can I store this cookie and have it automatically sent with every request? Perhaps there's a better approach altogether?

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• ADO Entity Framework 4 to WPF Datagrid. DatagridComboBox nightmare.

  - by Jason

  The WPF datagrid -seems- like it's going to work, but the combobox implementation does not work straight from the designer. So I'm left wandering around in the XAML randomly changing things trying to get it to work. The problems are numerous. I want to display a foreign key relationship (with drop down) instead of a bunch of numbers for a selection. It seems like it shouldn't be this hard. I can get the right values to show up (their description instead of an ID), but the table freaks out thinking that all the values have been modified. If I select a drop down, it refuses to allow me to edit anything else. I want to chalk this up as a .NET bug, but since I'm new to WPF datagrids, it's probably just me. Here is the code. <DataGridComboBoxColumn Header="Make Up" ItemsSource="{Binding Source={StaticResource materialMakeUpTypesViewSource}}" DisplayMemberPath="Description" TextBinding="{Binding Path=MaterialMakeUpType.Description}" SelectedItemBinding="{Binding Path=MaterialMakeUpType.Description}" SelectedValueBinding="{Binding Path=MaterialMakeUpType.ID}" />

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• What advantages does TFS 2010 have over Axios OnTime?

  - by Russell

  I am currently creating a business case for rolling out TFS 2010 as our source control and bug/release management tool. We currently use OnTime for our bug tracking software and subversion for our SCM. I was wondering what advantages TFS 2010 has over OnTime? I have done some thinking so far and would love to hear responses: TFS 2010 allows linking changesets-work items-builds TFS 2010 provides greater customisation of workflow than OnTime TFS 2010 is integrated into the Visual Studio IDE - This requires less apps to be open and less window flicking Thanks in advance.

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• Pathfinding Algorithm For Pacman

  - by user280454

  Hi, I wanted to implement the game Pacman. For the AI, I was thinking of using the A* algorithm, having seen it on numerous forums. However, I implemented the Breadth First Search for some simple pathfinding (going from point a to point b with certain obstacles in between) and found it gave the optimum path always. I guess it might be because in a game like pacman which uses simple pathfinding, there is no notion of costs in the graph. So, will it be OK if I use BFS instead of A* for pathfinding in Pacman?

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• Encryption Product Keys : Public and Private key encryption

  - by Aran Mulholland

  I need to generate and validate product keys and have been thinking about using a public/private key system. I generate our product keys based on a client name (which could be a variable length string) a 6 digit serial number. It would be good if the product key would be of a manageable length (16 characters or so) I need to encrypt them at the base and then distrubute the decryption/validation system. As our system is written in managed code (.NET) we dont want to distribute the encryption system, only the decryption. I need a public private key seems a good way to do this, encrypt with the one key that i keep and distribute the other key needed for decrpytion/verification. What is an appropriate mechanism to do this with the above requirements?

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• Cornerstone vs Versions for Mac OS X

  - by splicer

  I've been using svn on the command line for 5+ years, but I'm thinking of switching to GUI. The two kings of Mac subversion apps seem to be Versions and Cornerstone. Most of the reviews/comments I've seen comparing the two are from way back in 2008, when Cornerstone was first released. It's now 2010, and both apps have undergone significant changes. I've been running trial copies of both apps for the past week, and I still can't make up my mind. Which would you recommend and why?

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• help with number calculation algorithm [hw]

  - by sa125

  Hi - I'm working on a hw problem that asks me this: given a finite set of numbers, and a target number, find if the set can be used to calculate the target number using basic math operations (add, sub, mult, div) and using each number in the set exactly once (so I need to exhaust the set). This has to be done with recursion. So, for example, if I have the set {1, 2, 3, 4} and target 10, then I could get to it by using ((3 * 4) - 2)/1 = 10. I'm trying to phrase the algorithm in pseudo-code, but so far haven't gotten too far. I'm thinking graphs are the way to go, but would definitely appreciate help on this. thanks.

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• PHP - Alternatives to runkit for intercepting method calls

  - by Radu

  I have some very test-unfriendly code (to say the least) that I need to test. Refactoring unfortunately is not an option. I have to test the code as it is, without the possibility of changing it. To do that, I was thinking of intercepting function calls and dynamically change what they do so I can run my tests, as I need some functions and methods to return known values, and I need others that make requests, connect to the database, etc, to stop doing that and return what I need them to return. Is there any way to do this without runkit_method_redefine(), which is preferably not "EXPERIMENTAL" and still maintained? Maybe an alternative to runkit? Maybe a better way? Edit: will use PHPUnit's test doubles and PHP 5.3.2's features for making private methods accessible, if I need that functionality.

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• Apache Solr: Setting HTTP Response Headers From solrconfig.xml For CORS

  - by Noah Freitas

  Is it possible to setup the sending of a custom HTTP response header from within the solrconfig.xml file? I am thinking that it might be possible to add some configuration to the <requestDispatcher> since it controls caching headers. I am sure this is possible in the servlet container configuration (Jetty, Tomcat, etc.), but I would like to do this from within Solr's configuration files if at all possible. If this makes any difference, I am attempting to set an Access-Control-Allow-Origin header for CORS AJAX requests for a different host.

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• Automapper use in a MVVM application

  - by Echiban

  I am building a MVVM application. The model / entity (I am using NHibernate) is already done, and I am thinking of using AutoMapper to map between the ViewModel and Model. However this clause scares the jebus out of me: (from http://www.lostechies.com/blogs/jimmy_bogard/archive/2009/01/22/automapper-the-object-object-mapper.aspx) Blockquote AutoMapper enforces that for each type map (source/destination pair), all of the properties on the destination type are matched up with something on the source type To me, the logical choice is to map from model to viewmodel, (and I'll let viewmodel manually assign to model), but the quote basically kills the idea since the viewmodel will definitely have properties that don't exist on the model. How have you been using Automapper in a MVVM app? Please help!

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• Some solid OOP criticism?

  - by Bubba88

  Hi! I want to ask you to provide me with some articles (maybe books), which you possibly have found very convincing criticising the OOP methodology. I have read some in the WWW on this topic and I didn't really find a 'definitive demotivator'. It's not much about my personal attitude to the OOP, but I really would like to have something constructive, rigorous foundation for any kind of discussion and just abstract thinking. You can post some original research too, but please be very constructive (as my personal request). Thank you very much!

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• Spark VS 2010 intellisense

  - by mare

  I was thinking about switching one of my projects (and after that subsequently other projects too) to Spark View Engine but after todays research I ran into problem of a lack of Intellisense for Visual studio 2010. Not only that but it seems that the project is not maintained regularly. So I'm left with a feeling that I should not choose Spark at this time yet. However, apparently NHaml has the same "issues" too. I know it is discussed in more detail here http://stackoverflow.com/questions/1451319/asp-net-mvc-view-engine-comparison but I would still like you thoughts on what to choose or just stay with WebForms view engine for now?

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• Dynamic programming - Coin change decision problem?

  - by Tony

  I'm reviewing some old notes from my algorithms course and the dynamic programming problems are seeming a bit tricky to me. I have a problem where we have an unlimited supply of coins, with some denominations x1, x2, ... xn and we want to make change for some value X. We are trying to design a dynamic program to decide whether change for X can be made or not (not minimizing the number of coins, or returning which coins, just true or false). I've done some thinking about this problem, and I can see a recursive method of doing this where it's something like... MakeChange(X, x[1..n this is the coins]) for (int i = 1; i < n; i++) { if ( (X - x[i] ==0) || MakeChange(X - x[i]) ) return true; } return false; Converting this a dynamic program is not coming so easily to me. How might I approach this?

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• AnkhSVN client side pre-commit hook

  - by santa

  Basically I want to do the same thing as the fella over there. It seems that everybody was thinking about server-side hooks (with all their evil potential). I want a client side script be run before commit so astyle can format the code the way my boss likes to see it. Since my IDE (VS2010Pro) automatically checks when a file changed on the disk an opts me in for reloading it, there is no real evil with all that. Is there any (clean) way to accomplish that with AnkhSVN? Maybe there's also a way to extend VisualStudio to call my pre-commit-script...

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• Erlang: 2 database on 2 webserver ??

  - by xRobot

  I have created a blogging system with php+postgresql. Now I want to add a web chat ( in REAL TIME for Million of users simultaneously ) where every message is saved in database. I am thinking to use Erlang+Mnesia on a different webserver for this issue. Message's table will be like this: message_id, user_id, message, date user_id should be related with users table in Postgresql database in another webserver. How can I do that without lose performance ? If you have any other creative solutions tell me please ;).

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