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• can I read exactly one UDP packet off a socket?

  - by Brian Palmer

  Using UNIX socket APIs on Linux, is there any way to guarantee that I read one UDP packet, and only one UDP packet? I'm currently reading packets off a non-blocking socket using recvmsg, with a buffer size a little larger than the MTU of our internal network. This should ensure that I can always receive the full UDP packet, but I'm not sure I can guarantee that I'll never receive more than one packet per recvmsg call, if the packets are small. The recvmsg man pages reference the MSG_WAITALL option, which attempts to wait until the buffer is filled. We're not using this, so does that imply that recvmsg will always return after one datagram is read? Is there any way to guarantee this? Ideally I'd like a cross-UNIX solution, but if that doesn't exist is there something Linux specific?

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• Invalid AuthenticityToken everywhere

  - by bwizzy

  I have a rails app that I just deployed which is generating Invalid AuthenticityToken errors anywhere a form is submitted. The app uses subdomains as account names and will also eventually allow for a custom domain to be entered. I have an entry in production.rb to allow for cross-domain session handling. The problem is that you can't login / or submit any form because everything raises an Invalid AuthenticityToken error. The issue looks similar but not the same as http://stackoverflow.com/questions/1201901/rails-invalid-authenticity-token-after-deploy plus I'm not using mongrel. I've tried clearing cookies in the browser, and restarting passenger but no luck. Anyone have any ideas? The server is running nginx + passenger 2.3.11, and Rails 2.3.5. #production.rb config.action_controller.session[:domain] = '.domain.com' #environment.rb config.action_controller.session = { :session_key => '_app_session', :secret => '.... nums and chars .....' }

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• Development deployment: how to achive edit-and-reload with JSP pages?

  - by doublep

  Out project uses WebLogic as web-server and uses mostly JSP for user interface. With standard setup it is possible to copy edited JSP files into the exploded deployment directory and WebLogic will automatically pick them up, recompile and serve new content through HTTP. However, is it possible to avoid copying at all, so that I just save a file in my editor and it is immediately (well, after a couple of seconds for recompilation) visible? The project uses Apache Ant as building tool. I would imagine what I want would be possible with symlinks (since this is for deployment only I don't care about cross-platformity), but then I don't see how it is possible to symlink lots of files at once with Ant. So, how do I achieve save-JSP-hit-F5-in-browser functionality either with some setting in WebLogic; or with symlinking JSPs using Apache Ant (instead of copying them as is done now); or something else completely?

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• Creating an image from webcam every x miliseconds

  - by Rita

  Hello everyone, I am using c# to integrate with a web cam. I need to generate a snapshot image every x miliseconds and save it to file. I already have the code up and running to save to file on a button click event, however I wonder what am I supposed to do when taking snapshots in the background - Should this be multi threaded? I'm honestly not sure. I could just block the UI thread, put Thread.Sleep and then just take the snapshot, but I don't know if this is right. I thought of using a background worker, but I am now experiencing cross threaded difficulties with SendMessage... So I wonder if I should even go and bother to multi-thread or just block the UI. Help greatly appertained, thanks in advance.

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• License problem embedding Mono?

  - by mydiscogr

  I'd like to embed Mono into an .exe file but the problem is the license, because a LGPL library can only be linked with LGPL code. However, I'd like to build a commercial app, so I ask if is possible to use a stub that launches a DLL version of the Mono runtime and executes my app. Or do you know a better way to do this? I need a cross-platform framework and Mono seems good, but there are some problem to pack it in one file, so you know a "free" way to do this?

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• Concepts a web application developer should know?

  - by iama

  I think it is imperative for web application developers to know the answers surrounding the following general questions on web development irrespective of the programming language/framework used. What authentication mechanisms HTTP offer & what are their pros and cons? Why should one go for FORMS authentication? How to secure authentication or for that matter any transactions via HTTP? How to maintain state in HTTP? What are the downsides to maintaining state via cookie & what happens when browsers disable them? Security issues like cross site scripting, session hijacking etc. What other questions a web developer should have answers for similar to the ones above that are programming language/web framework agnostic?

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• Using Java server-side with PHP-generated front-end

  - by Storm

  Hi!  Does anyone have a real-world experience in building such a project? I'd like to move away questions about "is it good idea or not", but focus on possible solutions. I see one simple way - HTTP GET/POST + xml/json - and one more elegant - AJAX/DWR. As for the first one - I understand that it is possible, but needs quite a lot coding. As for second way - is it possible to use Java DWR engine with PHP front-end? Is DWR language-independent for client side (as it uses just JavaScript)?  Would it be a problem, that client page was generated by one web server (for example, apache+php) and served on server-side by another (for example, tomcat)? I suspect, that Tomcat will complain about sessions. Can this problem be fixed with allowing cross-domain AJAX? Thank you in advance. Denis.

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• Is there an "extended" UIHint attribute to apply CSS styles for DisplayFor - EditorFor templates?

  - by AJ

  Intro: After reading Brad Wilson Metadata series and searching unsuccesfully on google, I was wondering: Question: Has any OS project / code been created that allows you to tag CSS styles in the Meta information, for example in my (buddy) Model, I want to be able to decorate a property with multiple CSS styles (a single style you can fake with UIHint, I want to set many possible styles - and be able to "cross-utilise") eg. public class MyModel { [DisplayCssHint("h5")] [DisplayCssHint("color:#777;")] [EditorCssHint(".myCoolTextClass")] [EditorCssHint(".myOtherCoolTextClass")] public string Title{ get;set; } [DisplayCssHint(".normaltext")] [EditorCssHint(".myCoolTextClass")] [EditorCssHint(".myOtherCoolTextClass")] public string Message {get;set;} } Thoughts: I know that this does not seem like a logical place to put styling information, however as it is metadata and is discriptive... besides it would be nice to do this while prototyping - (especially being able to apply class styles and extending it further - to generate .Less files would really be cool! more to the point I would hate to write it, if its already been done ;). Any links/pointers/idea's would be appreciated. Thanks,

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• Password authentication in sqlite3 for iphone

  - by user271753

  Hey Guys .. I am new to programming in Objective C . I checked many tutorials on reading data in sqlite3 , but almost all of them have show the data in UITableView . I have a page where the user types in the password, the password lets say 1234 is saved in the database ( I have created a table already ) . I have got the database into the project folder . I just want a statement like if(databasepassword == correct from the uitextfield ) { show next page } else { password is incorrect.text } I will figure out on how to show the next page and display the password is incorrect.text I just want a method to cross check with the password saved in the database . How can I do that ? Regards

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• What is the best jQuery based window plug-in you have ever used?

  - by Emre Sevinç

  I tried a couple of jQuery based window plug-ins but unfortunately was not satisfied with any of them. Here's what I tried: http://hernan.amiune.com/labs/jQuery-Windows-Engine-Plugin/jQuery-Windows-Engine-Plugin.html http://fstoke.me/jquery/window/ http://www.soyos.net/aerowindow-jquery.html I need following features without any compromises: Maximize, minimize (to a reasonable location such as bottom-left corner, not in the middle of the screen), drag, resize, etc. Highly and easily configurable Actively developed (this can be relaxed a little bit) Comes with good documentation (and examples) works cross-browser (I had problems in IE when I tried to use fstoke.me's implementation). The three plug-ins I have tried failed in one or more respects. I'm not looking for very fancy, animated effects, just very basic but yet adequate functionality. Any suggestions?

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• need a web browser in my desktop application

  - by javadahut

  part of the specification of this desktop application is to have a mini browser built in, so that you can enter URL, and navigate the site as you would on a normal browser. Access to the browser page's DOM is required, should let me programmatically change the rendering view of a page, should be cross-platform, renders javascript JDIC seems outdated and I've heard Mozswing doesn't run on Mac.... Jxbrowser license costs a grand and up. Is Java the wrong platform to be creating such app? Are there any other solutions out there for building an application like this ? Thank you.

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• Facebook Is it possible to grab a user's data and populate a form in an iframe?

  - by super9

  I am trying to create an iframe tab for a Facebook Page. On this page, I am loading in an iframe which consists of a form from another domain/site. Is it possible to use javascript to query the graph api to load the user's data into this iframe loaded form using javascript such that is appears pre-populated to the user? I am aware that there is a cross domain security issue. In that case, suppose that my iframe tab is now hosted on the same domain as the iframe loaded form, will this be doable now?

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• ASP.Net MVC elegant UI and ModelBinder authorization

  - by SDReyes

  We know authorization stuff is a cross cutting concern, and we do anything we could to avoid merge business logic in our views. But I still not found an elegant way to filter UI components (e.g. widgets, form elements, tables, etc) using the current user roles without contaminate the view with business logic. same applies for model binding. Example Form: Product Creation Fields: Name Price Discount Roles: Role Administrator Is allowed to see and modify the Name field Is allowed to see and modify the Price field Is allowed to see and modify the Discount Role Administrator assistant Is allowed to see and modify the Name Is allowed to see and modify the Price Fields shown in each role are different, and model binding needs to ignore the discount field for 'Administrator assistant' role. How would you do it?

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• Mongrel with Ruby 1.9.

  - by JussiR

  When starting the server, I get this strange error after updating to Ruby 1.9: " [BUG] cross-thread violation on rb_gc() ruby 1.8.6 (2008-08-11) [i386-mswin32] This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. " My mongrel version is 1.1.6, which should be compatible with Ruby 1.9. I also still have the Ruby 1.8.6 installation, so i assume that for some reason mongrel tries to access that and kills ruby? My rails version is 2.3.4, in case it matters.

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• disallow selection inside an input element

  - by mkoryak

  I am looking to do the following Disallow text selection inside of an input element Do not show the cursor carrot inside of an input i cannot simply blur the input on click, focus must remain in the input. There is probably a way to do this in just IE, i would of course rather have a cross browser solution but ill settle for IE (or FF) only solution. Here is a demo page where you can see why i might need this functionality: http://programmingdrunk.com/current-projects/dropdownReplacement/ if you click on the dropdowns in the first row on page, you will see the carrot inside the dropdown which looks funny. (this wont happen in chrome, but will in FF or IE)

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• VBA Macro On Timer style to run code every set number of seconds, i.e. 120 seconds

  - by FinancialRadDeveloper

  I have a need to run a piece of code every 120 seconds. I am looking for an easy way to do this in VBA. I know that it would be possible to get the timer value from the Auto_Open event to prevent having to use a magic number, but I can't quite get how to fire off a timer to get something to run every 120 seconds. I don't really want to use an infinite loop with a sleep if I can avoid it. EDIT: Cross-post based on an answer provided is at: http://stackoverflow.com/questions/2341762/excel-vba-application-ontime-i-think-its-a-bad-idea-to-use-this-thoughts-eit

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• Storage servers architectural solution for backup. What is the best way? (pics inside)

  - by Kirzilla

  Hello, What is the best architecture for storage servers array? Needs... a) easy way to add one more server to array b) we don't have single backup server c) we need to have one backup for each "web" part of each server Group #1 : is cross-server-backuping scheme; the main disadvantage that we can't add one more server, we should add 2 servers in one time. Group #2 : is a Group #1, but with three and more servers. It also have a disadvantage - to add one more server we should move existing backup to it. Any suggestions? Thank you. Thank you.

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• Should we use NsMutableArray in CGRectIntersect ?

  - by srikanth rongali

  To know whether two sprites cross each other or not, should we use NSMutableArray to store the sprites ? In my game one fixed sprite(player) is there. And the other is a bullet fired and if this sprite intersects player sprite, then enemy won. I have used NSMutable Array to store the bullet sprites. If I do not use NSMutableArray then even though the the bullet intersects player it is not recognizing the intersection ? I am using ( (CGRectIntersectsRect(bulletRect, playerRect)). Thank You.

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• Using Java server-side with PHP front-end

  - by Storm

  Hi!  Does anyone have a real-world experience in building such a project? I'd like to move away questions about "is it good idea or not", but focus on possible solutions. I see one simple way - HTTP GET/POST + xml/json - and one more elegant - AJAX/DWR. As for the first one - I understand that it is possible, but needs quite a lot coding. As for second way - is it possible to use Java DWR engine with PHP front-end? Is DWR language-independent for client side (as it uses just JavaScript)?  Would it be a problem, that client page was generated by one web server (for example, apache+php) and served on server-side by another (for example, tomcat)? I suspect, that Tomcat will complain about sessions. Can this problem be fixed with allowing cross-domain AJAX? Thank you in advance. Denis.

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• Load Excel data into Linux / wxWidgets C++ application?

  - by Milan Babuškov

  I'm using wxWidgets to write cross-plafrom applications. In one of applications I need to be able to load data from Microsoft Excel (.xls) files, but I need this to work on Linux as well, so I assume I cannot use OLE or whatever technology is available on Windows. I see that there are many open source programs that can read excel files (OpenOffice, KOffice, etc.), so I wonder if there is some library that I could use? Excel files it needs to support are very simple, straight tabular data. I don't need to extract any formatting except column/row position and the data itself.

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• Windows threading: _beginthread vs _beginthreadex vs CreateThread C++

  - by Lirik

  What's a better way to start a thread? I'm trying to determine what are the advantages/disadvantages of _beginthread, _beginthreadex and CreateThread. All of these functions return a thread handle to a newly created thread, I already know that CreateThread provides a little extra information when an error occurs (it can be checked by calling GetLastError)... but what are some things I should consider when I'm using these functions? I'm working with a windows application, so cross-platform computability is already out of the question. I have gone through the msdn documentation and I just can't understand, for example, why anybody would decide to use _beginthread instead of CreateThread or vice versa. Cheers! Update: OK, thanks for all the info, I've also read in a couple of places that I can't call WaitForSingleObject() if I used _beginthread(), but if I call _endthread() in the thread shouldn't that work? What's the deal there?

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• Question about layout in java.

  - by extro

  I have two panels main_panel and child_panel. I have set layout for main_panel by using "main_panel.setLayout(flowlayout)" and added child_panel in main_panel by using "main_panel.add(child_panel)". This child_panel gets added to main_panel but its position is at the cross-section of horizontal midpoint and top vertical section of screen. But I want child_panel to be at the top left corner, something I could have done by using "child_panel.setlocation(a,b)" method, if I have set the Layout of main_panel as NULL. I have used flowlayout here because I want components in the JPanel to keep adjusting with the size of JFrame. So question is, can I add child_panel to main_panel at the exact location I want, even if I set the Layout of main_panel as not NULL.

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• Not able to override CSS within IFrame

  - by Madhur Ahuja

  I am using disqus comments for my jekyll blog with some CSS styles overriden in my stylesheet and used to work perfectly. Recently, disqus has introduced a new UI for their comments system which has completely broken the font colors. Since my site has dark background, I am trying to apply styles based on new disqus HTML structure generated. However, it seems that none of my styles get applied. It seems that is because disqus is loaded within iframe. Any ideas how can I fix the font colors. Example of the post: http://www.madhur.co.in/blog/2012/03/27/codeplexmovegit.html UPDATE Based on this question How to apply CSS to iFrame? it seems that you cannot style a child IFrame cross domain. I am wondering how it used to work earlier. Disqus even has documentation on it http://docs.disqus.com/help/69/

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• passing request params from jQuery to jersey service using json

  - by ccduga

  hi, im trying to POST (cross domain) some data to a jersey web service and retrieve a response (a GenericEntity object). The post successfully gets mapped to my jersey endpoint however when i pull the parameters from the request they are empty.. $ .ajax({ type: "POST", dataType: "application/json; charset=utf-8", url: jerseyNewUserUrl+'?jsoncallback=?', data:{'id':id, 'firstname':firstname,'lastname':lastname}, success: function(data, textStatus) { $('#jsonResult').html("some data: " + data.responseMsg); }, error: function ( XMLHttpRequest, textStatus, errorThrown){ alert('error'); } }); this is my jersey endpoint.. @POST @Produces( { "application/x-javascript", MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML }) @Path("/new") public JSONWithPadding addNewUser(@QueryParam("jsoncallback") @DefaultValue("empty") final String argJsonCallback, @QueryParam("id") final String argID, @QueryParam("firstname") final String argFirstName, @QueryParam("lastname") final String argLastName) is there something missing from my $.ajax call?

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• Program crashes in debugger before anything happens

  - by Tim

  I'm building an application for Windows XP using the MinGW tool chain and it sometimes crashes unexpectedly. So, I'm trying to use a debugger (Gdb) but the program exits with code 03 before anything happens. In fact, all I see from GDB is: [New thread 3184.0x7b8][New thread 3184.0xef8] Program exited with code 03. My suspicion is that there is some failed dynamic linking of a dependency (which are Qt, VTK, and ITK, all built with MinGW). However, this does not happen when I just run the program normally. Or if it happens, it appears to be intermittent and well after the program is launched and running. NOTE: I'm also using Cmake for cross compiling. What should I do? What can I try?

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