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• ORM vs SQL XML, very simple middle-tier

  - by synergetic

  I know it is rather heated question. But anyway I'd like to hear opinions of those in Stackoverflow. Given that XML support is quite good in SQL Server 2005/2008, and there's no concern about database independency, why one need Linq-to-SQL, Entity Framework, NHibernate and the likes, which are quite complex and awkward in advanced use-cases, if by using POCOs, XmlSerializer, and stored procedures which process XML, one can achieve a lot less complex middle-tier? For reference, see the link: http://weblogs.asp.net/jezell/archive/2007/04/13/who-needs-orm-i-ve-got-sql-2005.aspx

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• Does jQuery or JavaScript have the concept of classes and objects?

  - by Prashant

  I found the following code somewhere, but I am not understanding the code properly. ArticleVote.submitVote('no');return false; Is ArticleVote a class and submitVote() a function of that class? Or what does the above code mean? And is there any concept of classes and objects in jQuery or in traditional JavaScript? How to create them? Please share some reference links or code.

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• facebook application error

  - by moustafa

  it needs facebook facepile plugin(http://developers.facebook.com/docs/reference/plugins/facepile). i tried but i am getting this error (The Facebook Connect cross-domain receiver URL (http://static.ak.fbcdn.net/connect/xd_proxy.php#?=&cb=f223d517566e616&origin=http%3A%2F%2Fpromolife.com.au%2Ff3e13728ba8ec8&relation=parent.parent&transport=postmessage) must have the application's Connect URL (http://www.testsite.com.au/) as a prefix. You can configure the Connect URL in the Application Settings Editor.) why do i getting this error please help me.

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• How is this algorithm, for finding maximum path on a Directed Acyclical Graph, called?

  - by Martín Fixman

  Since some time, I'm using an algorithm that runs in complexity O(V + E) for finding maximum path on a Directed Acyclical Graph from point A to point B, that consists on doing a flood fill to find what nodes are accessible from note A, and how many "parents" (edges that come from other nodes) each node has. Then, I do a BFS but only "activating" a node when I already had used all its "parents". queue <int> a int paths[] ; //Number of paths that go to note i int edge[][] ; //Edges of a int mpath[] ; //max path from 0 to i (without counting the weight of i) int weight[] ; //weight of each node mpath[0] = 0 a.push(0) while not empty(a) for i in edge[a] paths[i] += 1 a.push(i) while not empty(a) for i in children[a] mpath[i] = max(mpath[i], mpath[a] + weight[a]) ; paths[i] -= 1 ; if path[i] = 0 a.push(i) ; Is there any special name for this algorithm? I told it to an Informatics professor, he just called it "Maximum Path on a DAG", but it doesn't sound good when you say "I solved the first problem with a Fenwick Tree, the second with Dijkstra, and the third with Maximum Path".

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• Providing raw MP3/AAC data to Flex/Flash from a custom container

  - by Joonas Trussmann

  Having had a quick look at the Flex docs I can't seem to find any reference to providing audio content to be played from a custom (possibly encrypted - don't worry, it's not that evil) container format. Is this possible and if so, could someone point me in the right direction. Or if that's not possible, some way to hook into the disk/network (disk is much more important in this case) I/O of the sound playing mechanism to provide a supported container in memory from a custom wrapper.

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• Dangling pointers and double free

  - by user151410

  After some painful experiences, I understand the problem of dangling pointers and double free. I am seeking proper solutions. aStruct has a number of fields including other arrays. aStruct *A=NULL, *B = NULL; A = (aStruct*) calloc(1, sizeof(sStruct)); B = A; free_aStruct(A); ... //bunch of other code in various places. ... free_aStruct(B); Is there any way to write free_aStruct(X) so that free_aStruct(B) exists gracefully?? void free_aStruct(aStruct *X){ if (X ! = NULL){ if (X->a != NULL){free(X->a); x->a = NULL;} free(X); X = NULL; } } Doing above only sets A = NULL when free_aStruct(A); is called. B is now dangling. How can this situation be avoided / remedied? Is reference counting the only viable solution? or, are there other "defensive" free approaches, to prevent free_aStruct(B); from exploding? Thanks, Russ

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• Reducing load time, or making the user think the load time is less

  - by Malfist

  I've been working on a website, and we've managed to reduce the total content for a page load from 13.7MiB's to 2.4, but the page still takes forever to load. It's a joomla site (ick), and it has a lot of redundant DOM elements (2000+ for the home page), and make 60+ HttpRequest's per page load, counting all the css, js, and image requests. Unlike drupal, joomla won't merge them all on the fly, and they have to be kept separate or else the joomla components will go nuts. What can I do to improve load time? Things I've done: Added colors to dom elements that have large images as their background so the color is loaded, then the image Reduced excessively large images to much smaller file sizes Reduced DOM elements to ~2000, from ~5000 Loading CSS at the start of the page, and javascript at the end Not totally possible, joomla injects it's own javascript and css and it does it at the header, always. Minified most javascript Setup caching and gziping on server Uncached size 2.4MB, cached is ~300KB, but even with so many dom elements, the page takes a good bit of time to render. What more can I do to improve the load time?

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• Spring/Eclipse 'referenced bean not found' warning when using <import>?

  - by HDave

  I have just broken up a Spring bean configuration file into smaller external files and have used the the "import" directive to include them in my Spring Test application context XML file. But whenever I reference one of the beans from the imported files I get a warning within Eclipse/STS/Spring XML editor complaining that "referenced bean 'foo' not found" Is this is a bug or is it me? It's really annoying because I don't want to disable the warning, yet at my company we try to eliminate all warnings.

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• Web Shop Schema - Document Db

  - by Maxem

  I'd like to evaluate a document db, probably mongo db in an ASP.Net MVC web shop. A little reasoning at the beginning: There are about 2 million products. The product model would be pretty bad for rdbms as there'd be many different kinds of products with unique attributes. For example, there'd be books which have isbn, authors, title, pages etc as well as dvds with play time, directors, artists etc and quite a few more types. In the end, I'd have about 9 different products with a combined column count (counting common columns like title only once) of about 70 to 100 whereas each individual product has 15 columns at most. The three commonly used ways in RDBMS would be: EAV model which would have pretty bad performance characteristics and would make it either impractical or perform even worse if I'd like to display the author of a book in a list of different products (think start page, recommended products etc.). Ignore the column count and put it all in the product table: Although I deal with somewhat bigger databases (row wise), I don't have any experience with tables with more than 20 columns as far as performance is concered but I guess 100 columns would have some implications. Create a table for each product type: I personally don't like this approach as it complicates everything else. C# Driver / Classes: I'd like to use the NoRM driver and so far I think i'll try to create a product dto that contains all properties (grouped within detail classes like book details, except for those properties that should be displayed on list views etc.). In the app I'll use BookBehavior / DvdBehaviour which are wrappers around a product dto but only expose the revelent Properties. My questions now: Are my performance concerns with the many columns approach valid? Did I overlook something and there is a much better way to do it in an RDBMS? Is MongoDb on Windows stable enough? Does my approach with different behaviour wrappers make sense?

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• How do I calculate percentiles with python/numpy?

  - by Uri

  Is there a convenient way to calculate percentiles for a sequence or single-dimensional numpy array? I am looking for something similar to Excel's percentile function. I looked in NumPy's statistics reference, and couldn't find this. All I could find is the median (50th percentile), but not something more specific.

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• DLL administration

  - by carlos

  I build some dlls to be used in a big application, and have a team working in the dlls heart of the application and another team working in the gui, but i am having a problems in the deployment of the dll's when a change is done, because the gui team needs or copy the new dll to the project folder, or delete the old reference and add the new one. Is there a best practice to deal with this problem? I am using Visual Studio 2008 and devoloping int VB and C# Thanks !!!

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• Python 3 with numpy and object refernces

  - by user963386

  I need to create a large matrix (array) structure (3 axis) and each element should store the reference to a Python object (myclass instance). Is it possible to use numpy to create such an array. Which data type should I use in order to store Python references? The advantage of numpy is the support of slicing at different levels. The alternativee is to create a nested (nested) list but it is a cumbersome solution.

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• gcc compiling invalid C code

  - by aks

  Some of my C programs are not working as expected. For example, pass by reference is not possible in C, but when I write a C program which uses that and compile it with gcc it works fine. Is gcc a C++ compiler? How do I make it behave like a C compiler?

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• asp.net: Where can I put my source files.

  - by David Sykes

  I am developing a web form using Visual Web Developer Currently I have class source files in the same directory as the web form, or in the App_Code folder. I'd like to organise the files into folders within the web form folder, but I can't find a way of adding a reference to the folders, and they don't seem to be being picked up automatically. These are files that are under constant development. What is the asp.net/c#'s equivalent concept to c++'s #include?

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• Access 2007 can I capture the "clicked" field using an OnClick event on a report?

  - by Aaron Quince

  In Access 2007 I want to be able to click on a name field in a report and call a separate report with personal information about the person who's name was clicked to start the event. This would be as an alternative to creating a subreport or including the subreport fields in the main report in the interest of saving space. How do I reference the value of the clicked field for use in a query called with the OnClick event? Thanks for your help.

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• JVMTI: FollowReferences : how to skip Soft/Weak/Phantom references?

  - by Jayan

  I am writing a small code to detect number of objects left behind after certain actions in our tool. This uses FollowReferences() JVMTI-API. This counts instances reachable by all paths. How can I skip paths that included weak/soft/phantom reference? (IterateThroughHeap counts all objects at the moment, so the number is not fully reliable) Thanks, Jayan

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• How to get the header of the parent node of a selected TreeViewItem?

  - by Dabblernl

  I have this TreeView: Main Node Header="Main" Sub Node Header="Sub1" Final Node Header="Item1" Final Node Header="Item2" Sub Node Header="Sub 2" Final Node Header="Item1" Final Node Header="Item2" I have two textboxes that are bound to this TreeView. One has its Text property bound to the TreeView's SelectedItem property and works OK. The other TextBox I want to bind to the Header text of the Sub Node directly above the selected Item. How do I reference it?

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• Wcf service operation contract change

  - by pdiddy

  I recently added a parameter to one of the method of a wcf. It was a string parameter. The thing is that I didn't update the service reference on the client side but I was still able to call the wcf service ..... Wasn't it suppose to break?

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• Can I swap WCF deserializer from configuration?

  - by JohnIdol

  I have a problem with WCF deserialization where the client hangs on the response for more than a minute. I'd like to try to swap different deserializers and see if it affects the behavior. Can I swap in/out different serializers (are there any others?) from configuration, and if so can I do that with any binding, or is that out of control once the service reference is imported? Any help appreciated!

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• How can I get username of a gtalk user using XMPP with google appengine ?

  - by srivigneshwar

  I am using google appengine for my gtalk agent , I want to get the username of the gtalk user how can I get it ? for reference i use this in beginning XMPPService xmpp = XMPPServiceFactory.getXMPPService(); //STEP 2 Message msg = xmpp.parseMessage(req); JID fromJid = msg.getFromJid();

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• How to convert binary, OCT, HEX to calculate in Java?

  - by user316751

  Write an application that inputs one number consisting of FIVE digits from the user, separates the number into its individual digits and prints the digits separated from one another by three spaces each. For example, if the user types in the number 12345, the program should print 1 2 3 4 5 The following screen dump of result is for your reference. Input a digit: 12345 Digits in 12345 = 1 2 3 4 5 How to convert binary, OCT, HEX to calculate the question?

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• Trying to understand setting content providers in Android.

  - by Gabriel A. Zorrilla

  Hi there. I wanna change APN settings in a phone. Looked the api and there is a content provider named ACTION_APN_SETTINGS developer.android.com/reference/android/provider/Settings.html#ACTION_APN_SETTINGS but i'm having a hard time figuring out how to use it. Is there any example or something that does not involve the "contacts" content provider? Thanks.

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• Implementing Communication Protocols on CC2420 motes powered by TinyOS

  - by stanigator

  I would like to load TinyOS on CC2420 radio motes to operate on certain communication protocols (e.g. epidemic routing, probabilistic routing, etc.). However, I have no prior experience in programming motes to perform the protocols I want. I'm just wondering about the most applicable resources for reference and how difficult (if not impossible) was implementing such mentioned protocols. It would be great to hear from you. Thanks in advance!

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• Prepending character N followed by line numbers

  - by Denis

  Hi, I'm hand editing CNC Gcode text files and need a way to reference locations in the file and on the toolpath. I want to modify each line in the text file so that it begins with the the upper case N character followed by line numbers which increment in tens for every successive line, then a whitespace,followed by the original text file. Can I do this in vi?

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• Could not load file or assembly or one of its dependencies

  - by kp

  I changed some names of namespaces, assemblies in one of existing project (C# and ASP.NET). But when I try to debug it; I get this error. Could not load file or assembly 'HR' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040). I have replaced DFI with HR in the code.

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