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• questions about multi threading for sockets/tcp-connections.

  - by Fantastic Fourier

  I have a server that connects to multiple clients using TCP/IP connections, using C in Unix. Since it won't have more than 20 connections at a time, I figured I would use a thread per connection/socket. But the problem is writing to the sockets as I'll be sending user prompted msgs to clients. Once each socket is handled by a thread, how do I interact with the created thread to write to the sockets? Should each thread just read from the sockets and I'll write to sockets in the main program? Not sure if that's a good way to go about it.

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• Convert JSON String to Java Object or HashMap

  - by Priyank

  Hi. I am writing an android app. I want to pass some data across the intents/activities and I feel that a conversion to and from JSON is probably a more optimal way at this point. I am able to convert a java hashmap to a json string successfully using JSONObject support. However i need to convert back this JSON string to a java object or a hashmap. What is the best way to go about it. Is parcelable really a change worth doing; if I have simple 5 field object? What are the other ways to transfer data between intents. Cheers

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• Webfaction: How do I run a Static/Perl app and Django app under the same website

  - by swisstony

  I have an existing Perl app that I'm moving to a Webfaction website. I will be adding Django apps to this Webfaction website too. I would like the Django app to get first call and so would want its URL path to be / This would allow me to add any new URLs to the urls.py I wish as my app grows. If the URL doesn't match anything in the urls.py I would like it to get passed to the static Perl app. For example /app1 - Django /app2 - Django Everything else not picked up by urls.py I would want going to my Perl app For example: /index.html - Static/Perl app /about.html - Static/Perl app /contact.html - Static/Perl app /apps/perlapp1.cgi - Static/Perl app etc How do I go about achieving this in Webfaction?

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• Interface Design Problem: Storing Result of Transactions

  - by jboyd

  Requirements: multiple sources of input (social media content) into a system multiple destinations of output (social media api's) sources and destinations WILL be added some pseudo: IContentProvider contentProvider = context.getBean("contentProvider"); List<Content> toPost = contentProvider.getContent(); for (Content c : toPost) { SocialMediaPresence smPresence = socialMediaService.getSMPresenceBySomeId(c.getDestId()); smPresence.hasTwitter(); smPresence.hasFacebook(); //just to show what this is smPresence.postContent(c); //post content could fail for some SM platforms, but shoulnd't be lost forever } So now I run out of steam, I need to know what content has been successfully posted, and if it hasn't gone too all platforms, or if another platform were added in the future that content needs to go out for it as well (therefore my content provider will need to not only know if content has gone out, but for what platforms). I'm not looking for code, although sample/pseudo is fine... I'm looking for an approach to this problem that I can implement

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• Rotation Interpolation

  - by Rob

  Hello, NB: I'll present this question in degrees purely for simplicity, radians, degrees, different zero-bearing, the problem is essentially the same. Does anyone have any ideas on the code behind rotational interpolation? Given a linear interpolation function: Lerp(from, to, amount), where amount is 0...1 which returns a value between from and to, by amount. How could I apply this same function to a rotational interpolation between 0 and 360 degrees? Given that degrees should not be returned outside 0 and 360. Given this unit circle for degrees: where from = 45 and to = 315, the algorithm should take the shortest path to the angle, i.e. it should go through zero, to 360 and then to 315 - and not all the way round 90, 180, 270 to 315. Is there a nice way to achieve this? Or is it going to just be a horrid mess of if() blocks? Am I missing some well understood standard way of doing this? Any help would be appreciated.

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• How do I specify the block object / predicate required by NSDictionary's keysOfEntriesPassingTest ?

  - by Todd

  For learning (not practical -- yet) purposes, I'd like to use the following method on an NSDictionary to give me back a set of keys that have values using a test I've defined. Unfortunately have no idea how to specify the predicate. NSDictionary keysOfEntriesPassingTest: - (NSSet *)keysOfEntriesPassingTest:(BOOL (^)(id key, id obj, BOOL *stop))predicate Let's say for example all my values are NSURLs, and I'd like to get back all the URLs that are on port 8080. Here's my stab at coding that -- though it doesn't really make sense to me that it'd be correct: NSSet * mySet = [myDict keysOfEntriesPassingTest:^(id key, id obj, BOOL *stop) { if( [[obj port] isEqual: [NSNumber numberWithInt: 8080]]) { return key; }] And that's because I get back the following compiler error: incompatible block pointer types initializing 'void (^)(struct objc_object *, struct objc_object *, BOOL *)', expected 'BOOL (^)(struct objc_object *, struct objc_object *, BOOL *)' What am I missing? I'd appreciate a pointer at some docs that go into more detail about the "Block object" that the predicate is supposed to be. Thanks!

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• Approaches for memcached sessions

  - by Industrial

  Hi everybody, I was thinking about using memcached to store sessions instead of mySQL, which seemed like a good idea, at first. When it comes to the failover part of utilizing memcached servers, It's a bit worrying that my sessions will stop working if the memcached would go offline. It will certainly affect my users. There's a few techniques that we already utilize to reduce failover, including having a pool of servers available to compensate in the event of downtime, utilizing sharding/consistent hashing across the server pool and so on. We would also do some sort of graceful degradation that tells the users that something have gone wrong and they are welcome to login again, in the event of them being kicked out due to memcached server failover. So how does people generally deal with these issues when storing sessions on memcached servers?

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• How can I fast-forward a single git commit, programmatically?

  - by Norman Ramsey

  I periodically get message from git that look like this: Your branch is behind the tracked remote branch 'local-master/master' by 3 commits, and can be fast-forwarded. I would like to be able to write commands in a shell script that can do the following: How can I tell if my current branch can be fast-forwarded from the remote branch it is tracking? How can I tell how many commits "behind" my branch is? How can I fast-forward by just one commit, so that for example, my local branch would go from "behind by 3 commits" to "behind by 2 commits"? (For those who are interested, I am trying to put together a quality git/darcs mirror.)

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• "os x" + octave + Miscellaneous Package: install errors

  - by Mike Briggs

  Trying to install the Miscellaneous Package into Octave, I get this string of errors: octave-3.2.3:17 pkg install miscellaneous-1.0.9.tar.gz configure: error: in /var/folders/0o/0ox7a-rlFVGd8pZnuF96sE+++TM/-Tmp-/oct-zTlMUh/miscellaneous-1.0.9/src': configure: error: C compiler cannot create executables See config.log' for more details. the configure script returned the following error: checking for gcc... gcc checking for C compiler default output file name... error: called from `pkgconfigure_make' in file /Applications/Octave.app/Contents/Resources/share/octave/3.2.3/m/pkg/pkg.m near line 1240, column 2 error: called from: error: /Applications/Octave.app/Contents/Resources/share/octave/3.2.3/m/pkg/pkg.m at line 714, column 5 error: /Applications/Octave.app/Contents/Resources/share/octave/3.2.3/m/pkg/pkg.m at line 287, column 7 What is this trying to tell me? Where should I go? Mike Briggs

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• Easy to follow LaTeX tutorial on layout?

  - by lexu

  I want to layout a page using LaTeX and distribute text snippets/blocks in predefined locations. Something like this +--------------------------------------------------------+ | +-------------+ | | |bla bla bla| | | |bla bl ab lab| +-------------+ | | |bla bla bla| |bla bla bla| | | |bla bl ab lab| |bla bl ab lab| | | +-------------+ |bla bla bla| | | |bla bl ab lab| | | +-------------+ +----+ | | |more| | | Ich und Du |text| | | Müllers Kuh +----+ | | | +--------------------------------------------------------+ My guess is that I should go about this using a minipage or using boxes like \begin{minipage}[b][2cm]{8cm} \mbox{more} \newline \mbox{text} \newline \end{minipage} Is there a tutorial or a 'how to' page that you know, that shows me how to do this - not a list all LaTeX idioms, I have some books for that. But my books are more focused on command lists, scientific publishing and math ..

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• How to convert an EntityCollection<T> to List<POCOObj>

  - by ggomez

  I have Entity Framework entities Events which have an EntityCollection of RSVP. I want to convert the EntityCollection of RSVP to a generic List< of a POCO class RSVP. So I want EntityCollection - List. What would be the best way to go about achieving this? So far I have this (it's missing the RSVP part) var events = from e in _entities.Event.Include("RSVP") select new BizObjects.Event { EventId = e.EventId, Name = e.Name, Location = e.Location, Organizer = e.Organizer, StartDate = e.StartDate, EndDate = e.EndDate, Description = e.Description, CreatedBy = e.CreatedBy, CreatedOn = e.CreatedOn, ModifiedBy = e.ModifiedBy, ModifiedOn = e.ModifiedOn, RSVPs = ??? }; Thanks.

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• Resources for widget creation

  - by Kenji Crosland

  My rails app is about to go live and I'm trying to figure out how to create a widget based on data on the site. My Javascript is not too hot--limited to the O'reilly head first book on JS. I can read simple Javascript okay but when it comes to writing it I'm a little lost. That said, I hope to roll out a widget, maybe a wordpress plugin too soon after my app is launched. Does anyone know of any rails plugins, javascript templates, tutorials or books that can get me going? I did ask a similar question before here: But my limited knowledge of JS kept me from implementing the suggested answer properly.

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• How to set the pointer to the current row in the Datagridview in C Sharp

  - by user286546

  I have a datagridview on the Windows Form in c#. I am updating and filling the table adapter on the cell event. The problem is that When I go to lower half of the datagrid which is not visible until I scroll down, as I click any cell, the table adapter is filled and updated and the pointerpoints to the very first row. Any suggestion on how to fix it. I have a ideas to record the top row of the datagridview that is visible and set the pointer to that row. But how to do it?

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• Between a jsf page and a managed bean, why the getter method is called twice

  - by Bariscan

  Hi, I have a jsf page with a form has an outputtext in it. The value of outputtext component is called from a backing bean (or managed bean). I know when I code it as #{MyBean.myString} Jsf rename it and calls getMyString() method. However the wierd thing is, when I put a breakpoint to the getter method of this component, I see it is called twice during the page is being rendered. The outputtext is in a h:form, and it is the only component wich is bind to a backingbean. I mean, it is so wierd that jsf should get the value when it first come to the getter method, however it needs to go to the getter method twice. Can you explain what is the reason of this behaviour in jsf? Any help would be appreciated, Best wishes, Baris

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• How can I resume downloads in Perl?

  - by Neeraj

  I have a project that depends upon some other binaries to be downloaded from web at install time.For this what i do is: if ( file-present-in-src/) # skip that file else # use wget to download the file The problem with this approach is that when I interrupt a download in middle, and do invoke the script next time, the partially downloaded file is also skipped (which is not desired), also I want wget to resume the download of the partially downloaded file. How should I go about it: Possible Solutions I could think of: Let the file to be downloaded to some file say download_tmp. Move to original file if successful. Handle SIG{'INT'} to write proper cleanup code. But none of these could help resume the partial file download, Any insights?

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• Multiple JS effects on one event

  - by Cylindric

  I've got a bunch of Ajax links in a menu that reload a div called #ajaxupdatediv. I want to display another div while that's loading the new content, so how would I fire off both effects? <div id="#ajaxupdatediv"> Content will go here </div> <div id="ajaxloadingdiv"> ...Loading... </div> Here's a bit of the PHP array( 'update' => '#ajaxupdatediv', 'before' => $this->Js->get('#ajaxupdatediv')->effect('fadeOut'), 'complete' => $this->Js->get('#ajaxupdatediv')->effect('fadeIn'), )

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• Converting raw bytes into audio sound

  - by Afro Genius

  In my application I inherit a javastreamingaudio class from the freeTTS package then bypass the write method which sends an array of bytes to the SourceDataLine for audio processing. Instead of writing to the data line, I write this and subsequent byte arrays into a buffer which I then bring into my class and try to process into sound. My application processes sound as arrays of floats so I convert to float and try to process but always get static sound back. I am sure this is the way to go but am missing something along the way. I know that sound is processed as frames and each frame is a group of bytes so in my application I have to process the bytes into frames somehow. Am I looking at this the right way? Thanx in advance for any help.

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• PHP DOMXml XPath of recursive Xpointer

  - by user256007

  My xml document reflects an Object. as referential Recursion is possible in objects and arrays. I need to reflect that in reproduced XML Structure too. Currently I am using Unique IDs to identify each node separately and a node like <recursion refer="IDREF"> and specifying the ID of the referenced Element. But in This way I need My Own Custom XPath resolver cause I want to let the users go deeper into the recursive node through the Identifying IDREF (Hope I am able to make you understand). So is there any better/liteweight solution ?? might be XPointer or XLink (I am not sure). Any help ??

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• SlideDown then call custom function

  - by user275074

  Hi, Having difficulty understanding why my function is being called twice. I'm trying to detect when a radio button is called (intRev_yes), check if a div is empty, slide down another div and then call a custome function which dynamically creates a date field. if(this.id=="intRev_yes"){ if($('div#mainField').is(':empty')){ $('.intRevSections').slideDown('slow',function(){ current=-1; addIrField(); }); } } When I alert out at each stage, after getting to the end (i.e. addIrField()), the script seems to go back to the slideDown() section and recalls addIrField(). I can't understand why, there are no loops. current is used as an index for the date field.

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• Recommendation for web-based database visualization tool

  - by prometheus

  Tableau is extremely flexible when it comes to visualizing and playing around with datasets, but it is extremely slow when you go into "production mode" and publish a particular view that you've created onto your server. Does anyone know of any tools that can be used to connect to a database, present interactive (or somewhat interactive) dashboards, and perform reasonably well when published to a server? To be clearer, I am looking for something like this -- http://www.corda.com/executive-dashboard-graph-styles.php. I realize that such a product might not exist. If so, is there a particular framework or library that I could use to create killer interactive visualizations of data for the web?

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• Debug .Net Framework's source code only shows disassembly in Visual Studio 2010

  - by jdecuyper

  Hi! I'm trying to debug .Net Framework's source code using Visual Studio 2010 Professional. I followed the steps described in Raj Kaimal's post but I must be doing something wrong since the only code I'm getting to see is the disassembly code: As you can see in the image, the Go to Source Code and the Load Symbols options are disabled. Nevertheless, symbols are downloaded from Microsoft's server since I can see them inside the local cache directory. The code I'm debugging goes as follow: var wr = WebRequest.Create("http://www.google.com"); Console.WriteLine("Web request created"); var req = wr.GetRequestStream(); Console.Read(); When I hit F11 to step into the first line of code, a window pops us looking for the "WebRequst.cs" file inside "f:\dd\ndp\fx\src\Net\System\Net\WebRequest.cs" which does not exists on my machine. What am I missing? Thanks a lot for your help.

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• C#: Messaging in local network

  - by Richard

  Hi All, I need to implement some form of communitcation mechanism in my application, to send Notifications/messages from one Application instance to all the others. This is a normal scenario where someone adds and item or deletes and item and you want to notify other users that this has happened. The application runs on the Client and connects to a database on the local network. So its not like all clients access a server instance of the application. So from what I know I could use MessageQueues or some form of Database polling where I have a table that stores all the messages (not ideal). Issue is I need to implement this very quickly, so sadly can't go very complex but need the quickest easiest solution. thanks for the help!

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• insertNewObjectForEntityForName: inManagedObjectContext: returning NSNumber bug?

  - by beinstein

  I'm relatively well versed in CoreData and have been using it for several years with little or no difficulty. All of a sudden I'm now dumbfounded by an error. For the life of me, I can't figure out why insertNewObjectForEntityForName:inManagedObjectContext: is all of a sudden returning some sort of strange instance of NSNumber. GDB says the returned object is of the correct custom subclass of NSManagedObject, but when I go to print a description of the NSManagedObject itself, I get the following error: *** -[NSCFNumber objectID]: unrecognized selector sent to instance 0x3f26f50 What's even stranger, is that I'm able to set some relationships and attributes using setValue:forKey: and all is good. But when I try to set once specific relationship, I get this error: *** -[NSCFNumber entity]: unrecognized selector sent to instance 0x3f26f50 Has anyone ever encountered anything like this before? I've tried clean all targets, restarting everything, even changing the model to the relationship in question is a to-one instead of a to-many. Nothing makes any difference.

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• Writing an app with Perl and Ruby?

  - by Jeff Erickson

  I am working on a project that is mostly Ruby on Rails. However, I need to generate and parse Excel files in this project (I know, I know...), so I've been using Perl's Spreadsheet::WriteExcel and Spreadsheet::ParseExcel which work well. However, what is the best way to combine this use of Perl with the larger Ruby on Rails app? Is calling the Perl script with backticks the kosher way to go about this? It feels a little hacky to me, but if that is the only (or best) way, then that's what I'll do. I wanted to reach out and see if anyone else has some suggestions or advise. Thank you!

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• Renaming and Moving Files in Bash or Perl

  - by Katie

  HI, I'm completely new to Bash and StackOverflow. I need to move a set of files (all contained in the same folder) to a target folder where files with the same name could already exist. In case a specific file exists, I need to rename the file before moving it, by appending for example an incremental integer to the file name. The extensions should be preserved (in other words, that appended incremental integer should go before the extension). The file names could contain dots in the middle. Originally, I was thinking about comparing the two folders to have a list of the existing files (I did this with "comm"), but then I got a bit stuck. I think I'm just trying to do things in the most complicated possible way. Any hint to do this in the "bash way"? It's OK if it is done in a script other than bash script.

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