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• generate all subsets of size k from a set

  - by Kumar

  hi, i want to generate all the subsets of size k from a set. eg:-say i have a set of 6 elements, i have to list all the subsets in which the cardinality of elements is 3. I tried looking for solution,but those are code snippets. Its been long since I have done coding,so I find it hard to understand the code and construct a executable program around it. A complete executable program in C or C++ will be quite helpful. Hoping of an optimal solution using recursion. Thanks in advance. Kumar.

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• Deserialize array values to .NET properties using DataContractJsonSerializer

  - by James Cadd

  I'm working with the DataContractJsonSerializer in Silverlight 4 and would like to deserialize the following JSON: { "collectionname":"Books", "collectionitems": [ ["12345-67890",201, "Book One"], ["09876-54321",45, "Book Two"] ] } Into classes like the following: class BookCollection { public string collectionname { get; set; } public List<Book> collectionitems { get; set; } } class Book { public string Id { get; set; } public int NumberOfPages { get; set; } public string Title { get; set; } } What's the proper place to extend DataContractJsonSerializer to map the unnamed first array element in "collectionitems" to the Id property of the Book class, the second element to the NumberOfPages property and the final element to Title? I don't have control over the JSON generation in this instance and would like the solution to work with the Silverlight subset of .NET. It would be great if the solution could perform the reverse for serialization as well.

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• How to make a secure login using UDID or device token?

  - by Erik B

  So I'm making an app where I want the users to be able add, edit and rate content, but I do not want to force them to register. Instead I was planning on just using their device id or device token to identify them. I'm planning on making both an iPhone and Android version, so I'm looking for a general solution, but the iPhone version has higher priority, so an iPhone specific solution would also be welcome. The problem is that I don't want just anyone to be able to use my web service by sending a phony device id or someone else's device id. How would the client prove to the server that it is providing the correct device id?

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• What is the best design for these data base tables?

  - by Mohammed Jamal

  I need to find the best solution to make the DB Normalized with large amount of data expected. My site has a Table Tags (contain key word,id) and also 4 types of data related to this tags table like(articles,resources,jobs,...). The big question is:- for the relation with tags what best solution for optimazaion & query speed? make a table for each relation like: table articlesToTags(ArticleID,TagID) table jobsToTags(jobid,tagid) etc. or put it all in one table like table tagsrelation(tagid,itemid,itemtype) I need your help. Please provide me with articles to help me in this design consider that in future the site can conation new section relate to tag Thanks

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• Extract part of HTML in C/Objective-C

  - by Dan

  Hi, I need to extract the detail content of a website while preserve all formatting of the division. The section I wish to extract is: ... <div class="detailContent"><p> <P dir=ltr><STRONG>Hinweis</strong>: Auf ... </p> </div> ... My current solution is to use HTMLParser from libxml2 and xpath to find the nodes and walk through all the nodes to reconstruct this piece of HTML. This is a long an complicated code. I' just wondering if there is an easier solution to extract part of HTML? Thanks.

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• How do we know the correct moves of Tower of Hanoi?

  - by Saqib

  We know that: In case of iterative solution: Alternating between the smallest and the next-smallest disks, follow the steps for the appropriate case: For an even number of disks: make the legal move between pegs A and B make the legal move between pegs A and C make the legal move between pegs B and C repeat until complete For an odd number of disks: make the legal move between pegs A and C make the legal move between pegs A and B make the legal move between pegs B and C repeat until complete In case of recursive solution: To move n discs from peg A to peg C: move n-1 discs from A to B. This leaves disc n alone on peg A move disc n from A to C move n-1 discs from B to C so they sit on disc n Now the questions are: How did we get this two solutions? Only by intuition? Or by logical/mathematical computation? If computation, how?

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• How to make a Scala Applet whose Applet class is a singleton?

  - by Jamie

  Hi, I don't know if a solution exists but it would be highly desirable. I'm making a Scala Applet, and I want the main Applet class to be a singleton so it can be accessed elsewhere in the applet, sort of like: object App extends Applet { def init { // do init here } } Instead I have to make the App class a normal instantiatable class otherwise it complains because the contructor is private. So the ugly hack I have is to go: object A { var pp: App = null } class App extends Applet { A.pp = this def init { // do init here } } I really hate this, and is one of the reasons I don't like making applets in Scala right now. Any better solution? It would be nice...

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• Real time video stream from camera via server to Iphone

  - by devdevdev

  Hi I want to create an Iphone app that can display real time video from a camera. The intended setup is. Camera connected to Mac Mini delivering real time video to Iphone over local network. The Iphone doesn't need to display high quality or use a high frame rate, but it has to be real time. Max 1 sec delay. I've been searching a lot for a solution, but so far I have not found a resonable one. HTTP Live Stream is not a solution due to the delay. Any suggestions?

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• How to solve this problem with lists?

  - by osabri

  what i don't understand in my task here what kind of list i can use, and if it should have 2 attributes key and value ? or only value? with pointers to another node ofc the task: "design a function which create a list using input from the keyboard _ the prefered solution. Assume that some magic stops the input; so the length of a list is not known in advance.(alternative solution: a function which creates explicitly a fixed list. However, all other function can not assume any knowledge about the length of lists). Necessary utilities( additional functions to be created): a function which deallocates the memory used for lists and a function which prints the content of the list. let the element of lists contain a letter. Design a function which create a copy of such list. can't also understand the list line !!!!!???

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• How to Stop Current Playing Song When using one thread with JLayer?

  - by mcnemesis

  I recently used a solution to the one-thread-at-a-time problem whe using Jlayer to play mp3 songs in Java. But this solution by Kaleb Brasee didn't hint at how you could stop the player, i.e how could one then call player.close()? Kaleb's code was: Executor executor = Executors.newSingleThreadExecutor(); executor.execute(new Runnable() { public void run() { /* do something */ } }); and this is the code I put in run() if(player != null) player.close(); try{ player = new Player(new FileInputStream(musicD.getPath())); player.play(); }catch(Exception e){} The problem is that much as this solves the problem of keeping the gui active while the music plays (in only one other thread -- what i'd wanted), I can't start playing another song :-( What could I do?

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• ZeroMQ Java Installation Problem

  - by Ivan

  Hi everyone, I'm trying to install ZeroMQ's Java library but I've been having problem. First error was ./configure complained about JAVA_HOME which everything seemed to be fine but I couldn't manage to solve it but I've found a particular solution in ZeroMQ's chat logs. The suggested solution was; JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Home" ./configure However it doesn't work for me. The error message I've been receiving is checking for jni.h in /Library/Java/Home/include... configure: error: cannot find jni.h in /Library/Java/Home/include. I've tried JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Home" ./configure and JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home" ./configure as well but still no luck. I'd like to hear StackOverflowers' thoughts about how I can solve this. Thanks.

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• StructureMap: Calling repository constructor based on RouteData

  - by FreshCode

  I'm implementing a multi-tenant ASP.NET MVC application and using StructureMap for DI where my repositories depend on an ITenantContext interface, which depends on RouteData (or a base controller property). How do I tell StructureMap to construct TenantContext(tenantID); where tenantID is derived from my RouteData or some base controller property? Given the following route: {tenant}/{controller}/{action} My base controller retrieves and stores the correct Tenant based on the {tenant} URL parameter. Using Tenant, a repository with an ITenantContext can be constructed to retrieve only data that is relevant to that tenant. Based on the other DI questions, AbstractFactory could be a solution?solution?

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• Markdown to text/plain and text/html for multipart email

  - by fphilipe

  I’m looking for a solution to send DRY multipart emails in Rails. With DRY I mean that the content for the mail is only defined once. I’ve thought about some possible solutions but haven’t found any existing implementations. The solutions I’ve thought about are: load the text from I18n and apply Markdown for the html mail and apply Markdown with a special output type for the text mail where links are put in parenthesis after the link text bold, italic and other formatting that doesn't make sense are removed ordered and unordered lists are maintained generate only the html mail and convert that to text according to the above conditions Is there any available solution out there? Which one is probably the better way to do it?

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• Is it possible / recommendable sending HTML emails containing Javascript?

  - by Adriano Varoli Piazza

  This is mostly a rhetorical question, as far as I've checked the answer is 'don't even bother', but I wanted to be really sure. We have an email app, where you can send email to lists of subscribers. This is not spam: it's used, for example, by an university to send communications to its students, by a museum to send emails to subscribers, etc. Recently, I was asked by a prospective client if it was possible to send html messages containing javascript without being marked as spam. Not knowing, I did a short trip of the webs and what I've got is (percentages out of my posterior) 'half the clients won't display properly', 'half the clients will flag you as spam' and 'half the clients will have blocked javascript altogether' (There's clearly some superposition). So the best solution seems to be adding a link to a proper page if really necessary. Have you got a different experience? Do you know of any email-merge solution that provides this feature? Do you know if specific clients accept it or refuse to display html with javascript?

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• ASP.NET Forms automation/serialization/binding

  - by creo

  I need to implement many forms in ASP.NET application (for IRS mostly). There are will be a lot of standard controls for each form (textboxes, dropdowns, checkboxes, radio). And business entity assigned to each. What's the best solution to automate this process? I need to: Have layout stored in DB (in XML). Layout must support several columns, tabbed interface Automatically bind business object values to the form Automatically read form values and write to business object Must support automatic validation Some basic workflows support would be good I used to work with TFS and saw how they implemented WorkItem templates (.wit files). In general this is all I need. But what framework did they build it on? How can I utilize this solution? I know about Dynamic Data only: http://www.asp.net/dynamicdata

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• Strategy for developing a multi function asp.net web application

  - by user247023

  I'm about to start a new project and want some advice on how to implement. I need a web application which contains a booking module for reserving timeslots, and a time management module which will enable employees to clock in / clock out. If I am writing an update to the time managment module, I don't want to disrupt the booking engine availability by releasing a new solution containing both modules. to make things more difficult, there is some shared functionality like common users, roles and security. Here's a suggestion I've gotten, which sounds a bit cruddy, but may be functional. Write a 'container' web application which consists of basically a frame, and authentication / security features. This then has links which, will load the 2 independantly built and released web applications into the frame. I can see that say, if I wanted to update the time management module, I would only need to build and release this separately, and the rest of the solution would be 'untouched' Any better alternatives?

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• Determite when and which a character added or deleted to/from a Text Box.

  - by Alon

  I have a simple text box in a WPF application. I need to know when a character was added/deleted in the text box, which character and where it was added or deleted. I thought to use the TextBox.KeyDown event, but it has some problems: I can't know where the character was added or deleted. I have no idea how to determite which character was added (from the KeyEventArgs). Any ideas? I don't care to use a completely different solution from what I thought. In addition, I've just started this project so I don't care to use Windows Forms instead of WPF if your solution requires it. Thank you.

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• How can I sync a database driven website to a different server

  - by tbrandao

  I have a website using cPanel on a dedicated account, I would like to be able to automatically sync the website to a second hosting company or perhaps to a local (in house ) server. Basically this is a type of replication. The website is database driven (MySQL), so Ideally it would sync everything (content, database, emails etc.) , but most importantly is syncing the website files and its database. I'm not so much looking for a fail-over solution as an automatic replication solution, so if the primary site (Server) goes off-line, I can manually bring up the replicated site quickly. I'm familiar with tools like unison and rsync, but most of these only sync file(s) and do not do too well with open database connections.

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• white-label collaborative open-source development (e.g. github/sourceforge/google-code in a box) ?

  - by Justin Grant

  Does anyone have a recommendation for an open-source or paid (either packaged or SaaS) solution for integrating collaborative development features into your own website? Here's more details: We currently host an online plugin gallery for our product. Users can upload and download plugins. But users can't easily collaborate on a plugin's development, can't easily report and track bugs on a plugin, can't easily track a plugin's versions or roadmap, etc. Of course, contributors can host their plugin development on github, sourceforge, google code, codeplex, etc. But keeping users on our website has some advantages. For example: We can use single-sign-on to avoid yet another username/password required we can integrate end-user issue tracking into our existing online issue-tracking systems we can get integrated analytics so we can better meet the needs of top contributors as well as downloaders We can easily reward reputation points to committers just like we do for people who answer lots of questions Anyone know a good solution for white-label sites for open-source project developer collaboration?

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• Denormalize for Simplicity: Ungood idea?

  - by yar

  After reading this question, I've learned that denormalization is not a solution for simplicity. What about this case? I have news-articles which have a list of sites-article-will-be-published-to. The latter can be expressed in normalized fashion either by table and a many-to-many relationship (via a cross-table, I think). But the simple solution is to just throw a bunch of booleans for the sites-article-will-be-published-to. Assuming the sites are: small in number will not change over time have no fields themselves, except a name Is this still a terrible idea? The many-to-many relationship seems somewhat cumbersome, but I've done it before in cases like this (and it seemed cumbersome). Note: I'm doing this in Rails, where it's not that painful.

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• How to allow sorting in the Django admin by a custom list_display field, which doesn't have a DB fie

  - by Gj

  I have a custom list_display field which is responsible for a column of integers in one of my admin pages. I need to allow staff members to sort according to it. There's a solution for how to acheive that if the integer represents a count/average/etc of some DB field, which is not the case for me. [ the solution for that case is here: http://stackoverflow.com/questions/2168475/django-admin-how-to-sort-by-one-of-the-custom-list-display-fields-that-has-no-da ] Any ideas how I can achieve this sorting without actually creating and maintaining a DB field for the values?

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• Document -> Flash viewer, not hosted

  - by Dane

  I've got a content management solution where we present scanned images (TIFF), PDFs, word docs for viewing. While we can simply embed a PDF, sometimes depending on user preferences it's a bit fiddly and sometimes not user-intuitive. I'd like a solution like scribd, embedit, etc, but not hosted. I want to run the application on our own servers and manage it that way (for legal reasons, and our clients won't buy the service if it's hosted somewhere else). SWFtools looks a little basic for my needs, plus doesn't do doc, docx or ppt. Any options? Doesn't have to be free, but would be ideal.

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• problem with connection of facebook in my app for iPhone

  - by Arun Sharma

  hello I have complete code of facebook connection. But When i dragged the complete code into my application then 112 errors will occurs. wherever i have use use that code "FBConnect/FBConnectGlobal.h"Then error will arises "FBConnect/FBConnectionGlobal.h" No such file or directory. Even i have given all the path in project setting/project active setting. So please tell me some solution how to rectify some solution. and also tell me exact place where i have set the path and what to give in that path Thanks

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• crossing edges in the travelling salesman problem

  - by bob

  Does there exist a travelling salesman problem where the optimal solution has edges that cross?

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• How to position a span inside a headline tag?

  - by citronas

  I'm forced to find a solution for the following situation: I have a h1 tag, like this: <h1 style="text-align: left">FOO FOO FOO<span class="h1subSpan">FOO 1 Foo 2</span></h1> The result should be like the following: FOO FOO FOO this space is invisible and achived through floating Foo1 Foo 2 This solution works with FF, Opera and IE8. How can I adapt this, to work with IE 7 as well? .h1subSpan { font-size:small; float:right; padding-right:19px; padding-top:5px; }

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