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• IE won't start session from an iframe?..

  - by jayarjo

  The task was to bypass login form on remote server with a session_id acquired through a call to server's web API. So that user wouldn't have to login twice. Since there's no way to set cookies for different domain. What we came up to was - put a little file on remote server, to which we pass encrypted session_id from hidden iframe and which is supposed to start a proper session for a remote app, which is then loaded in another iframe. This approach works fine in FF/Chrome, but not IE... However if I copy url to self-made remote authorization script from iframe's src attribute to to IE's address bar and load it from there, session get's created as expected. But for some reason it just doesn't want to do the same from an iframe. Does anyone have any clue, why this is happening?

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• How can I make Ruby rake display the full backtrace on uncaught exception

  - by Martinos

  As you may know rake swallows the full backtrace on uncaught exception. If I want to have a full backtrace, I need to add the --trace option. I find this very annoying because some of my tasks take long time to run (up to 6 hours), when it crashes I don't have any debugging info. I need to run it again with the --trace. On top of that, the system may not be in the same state as when the error occurred, so it may not show afterward. I always have to add --trace on any tasks. This displasy stuff that I don't want to see when the task is executed. Is there a way to change this default behaviour? (which I don't think is useful at all)

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• How to instantly termainate an un-supervised script on demand?

  - by errr

  I have a GUI which resembles an interpreter. It allows the user to write a script in Jython (implementation of Python in Java) and run it whenever he wants. Apart from that, I also wish to allow the user to instantly terminate the run whenever he wants. Thing is, I don't really know how to do it. The script is being run on a different Thread, but I don't know of any secure way to stop/interrupt/terminate a thread in the middle of its run, let alone not knowing what is being run by the thread/script (it could be a simple task or maybe some sort of a heavy SQL query against a DB, and a DB is something which requires careful resource handling). How can I instantly terminate such run on demand?

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• How do I truncate a .NET string?

  - by Steve Guidi

  I apologize for such a question that likely has a trivial solution, but I strangely could not find a concise API for this problem. Essentially, I would like to truncate a string such that it its length is not longer than a given value. I am writing to a database table and want to ensure that the values I write meet the constraint of the column's datatype. For instance, it would be nice if I could write the following: string NormalizeLength(string value, int maxLength) { return value.Substring(0, maxLength); } Unfortunately, this raises an exception because maxLength exceeds the string boundaries. Of course, I could write a function like the following, but I was hoping that something like this already exists. string NormalizeLength(string value, int maxLength) { return value.Length <= maxLength ? value : value.Substring(0, maxLength); } Where is the elusive API that performs this task? Is there one?

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• Lightweight messaging (async invocations) in Java

  - by Sergey Mikhanov

  I am looking for lightweight messaging framework in Java. My task is to process events in a SEDA’s manner: I know that some stages of the processing could be completed quickly, and others not, and would like to decouple these stages of processing. Let’s say I have components A and B and processing engine (be this container or whatever else) invokes component A, which in turn invokes component B. I do not care if execution time of component B will be 2s, but I do care if execution time of component A is below 50ms, for example. Therefore, it seems most reasonable for component A to submit a message to B, which B will process at the desired time. I am aware of different JMS implementations and Apache ActiveMQ: they are too heavyweight for this. I searched for some lightweight messaging (with really basic features like messages serialization and simplest routing) to no avail. Do you have anything to recommend in this issue?

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• Call JavaScript function from Silverlight 4.0 application

  - by Raha

  I am trying to call a function from a Silverlight application. It should be a very simple task to do but so far I am not getting the result that I am looking for. This is my Silverlight code: private void button2_Click(object sender, RoutedEventArgs e) { HtmlPage.Window.Invoke("SayHello", new string[] { "Salut!" }); } And this is the JavaScript code : function SayHello(theid) { alert(eval(theid)); var divStatusDiv = document.getElementById("divStatus"); divStatusDiv.style.backgroundColor = "Red"; } The alert message always show "undefined" but when I press "OK" the colour of that DIV gets changed to Red as it should be. Why am I getting "Undefined" all the time ?

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• image_to_function in Rails

  - by FCastellanos

  I have this method on rails so that I have an image calling a javascript function def image_to_function(name, function, html_options = {}) html_options.symbolize_keys! tag(:input, html_options.merge({ :type => "image", :src => image_path(name), :onclick => (html_options[:onclick] ? "#{html_options[:onclick]}; " : "") + "#{function};" })) end I grabbed this code from the application helper of the redmine source code, the problem I'm having is that when I click on the image it's sending a POST, does some one know how can I stop that? This is how I'm using it <%= image_to_function "eliminar-icon.png", "mark_for_destroy(this, '.task')" %> Thanks alot!

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• How can I get JavaDoc into a JunitReport?

  - by benklaasen

  Hi - I'm a tester, with some Java and plenty of bash coding experience. My team is building an automated functional test harness using JUnit 4 and ant. Testers write automated tests in Java and use JavaDoc to document these tests. We're using ant's JunitReport task to generate our test result reports. This works superbly for reporting. What we're missing, however, is a way to combine those JavaDoc free-text descriptions of what the test does along with the JunitReport results. My question is, what's involved to get the JavaDoc into the JunitReport output? I'd like to be able to inject the JavaDoc for a given test method into the JunitReport at the level of each method result. regards Ben

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• Java appliction design question

  - by ring bearer

  Hi I have a hobby project, which is basically to maintain 'todo' tasks in the way I like. One task can be described as: public class TodoItem { private String subject; private Date dueBy; private Date startBy; private Priority priority; private String category; private Status status; private String notes; } as you can imagine I would have 1000 todo items at a given time. What is the best strategy to store a todo item? (currently on an XML file) such that all the items are loaded quickly up on app start up(the application shows kind of a dashboard of all the items at start up) What is the best way to design its back-end so that it can be ported to android/or a J2ME based phone Currently this is done using java swing. What should be the concerns so that it works efficiently on a device where memory is limited? Thanks!

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• Data not displayed first time in android after copying the file from assets to data folder

  - by Thinkcomplete

  Description I have used the code tip from http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/ to copy a pre-filled data file to the target and handled this in a asynch task Problem : On starting the application it gives error and shuts down first time, starting again without any change it works perfectly fine. So first time after the file is copied, the error comes but after that no issues. Please help Code attached:.. private class CopyDatabase extends AsyncTask<String, Void, Boolean> { private final ProgressDialog dialog = new ProgressDialog(BabyNames.this); protected void onPreExecute() { this.dialog.setMessage("Loading..."); this.dialog.show(); } @Override protected Boolean doInBackground(String... params) { // TODO Auto-generated method stub try { namesDBSQLHelper.createDatabase(); return null; } catch(IOException ioe){ ioe.printStackTrace(); } return null; } protected void onPostExecute(final Boolean success){ if (this.dialog.isShowing()){ this.dialog.dismiss(); } } }

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• Fast read of certain bytes of multiple files in C/C++

  - by Alejandro Cámara

  I've been searching in the web about this question and although there are many similar questions about read/write in C/C++, I haven't found about this specific task. I want to be able to read from multiple files (256x256 files) only sizeof(double) bytes located in a certain position of each file. Right now my solution is, for each file: Open the file (read, binary mode): fstream fTest("current_file", ios_base::out | ios_base::binary); Seek the position I want to read: fTest.seekg(position*sizeof(test_value), ios_base::beg); Read the bytes: fTest.read((char *) &(output[i][j]), sizeof(test_value)); And close the file: fTest.close(); This takes about 350 ms to run inside a for{ for {} } structure with 256x256 iterations (one for each file). Q: Do you think there is a better way to implement this operation? How would you do it?

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• What is a good open source job scheduler in Java?

  - by Boaz

  Hi, In an application harvesting (many) RSS feeds, I want to dynamically schedule the feed downloaders based on the following criteria: The speed at which content are generated - source which produce content at a higher rate need to be visited more often. After downloading a feed, its content is analyzed and based on the current rate of publication the next run time is determined for the feed. Note that this is dynamically changing. Sometimes a feed is very active and sometimes it is slow. Every RSS feed should be visited at least once an hour. While the second one is done by most schedulers but the first one is more problematic. What JAVA-based open source scheduler would you recommend for the task? (and why ;) ) Thanks! Boaz

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• python threading and performace?

  - by kumar

  I had to do heavy I/o bound operation, i.e Parsing large files and converting from one format to other format. Initially I used to do it serially, i.e parsing one after another..! Performance was very poor ( it used take 90+ seconds). So I decided to use threading to improve the performance. I created one thread for each file. ( 4 threads) for file in file_list: t=threading.Thread(target = self.convertfile,args = file) t.start() ts.append(t) for t in ts: t.join() But for my astonishment, there is no performance improvement whatsoever. Now also it takes around 90+ seconds to complete the task. As this is I/o bound operation , I had expected to improve the performance. What am I doing wrong?

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• Designing a service for consumption on multiple mobile platforms

  - by Nate Bross

  I am building and designing a (mostly) read-only interface to some data. I'll be uing ASP.NET MVC to build a psudo-restful API. I'm wondering if anyone can provide some resources for building full-client applications for various mobile platforms, iPhone, Android, Blackberry, Windows Mobile, etc. I'm thinking that serving up XML data is going to be the most simple and universal, but parsing XML in objective-C for example doesn't sound like fun to me, but maybe there are some good libaries out there to help ease this task? In other words, what formt will be the quickest to implement on the client side? Are there any JSON parsrs for iPhone or Android? I know there are .NET JSON parsers, but not sure about other platforms -- is ther another format that might better? Or should I stick with pure XML and deal with it on each platform differently?

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• Serialize HTMLDocument and then rendering it in the server?

  - by Yang Bo

  Hi, After some Google search, I did not find anything fill my need. I want to save the current web page just as what it is. I mean, many web pages has Javascript executed and CSS changed, so after some user interactive, the web page may be different from the one when it is firstly loaded into browser. And I want to save the current web page state to the sever and rendering it in the server. Is there any Javascript library for this task? Thanks!

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• Good workflow with emacs+swank+slime+clojure?

  - by grm

  I just wanted opinion on good workflow using the emacs environment with clojure+swank+slime. I often find myself doing very repetitive keycommands and wonder if there is an obvious better way. I include swank with lein and start my project using lein swank from shell. Then I connect with emacs and do the correct use commands so that I can start to use (run-tests ). Then I do some coding and then want to test. To run the test I need to change buffer in emacs to the swank-repl C-x o, then I need to go to the prompt M-, then repeat the command M-p, then enter, maybe with an exception, then back to the code buffer and continue all over again with all the emacs commands. I find it a bit repetitive. I guess the solution would be to start hack on emacs and maybe add a shortcut for doing this repetitive task, but I would love to hear some suggestions because I can't be the only one who find this tedious?

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• Java - SwingWorker - problem in done() method

  - by Yatendra Goel

  I am using javax.swing.SwingWorker for the first time. I want to update a JLabel from the interim result published by the swing worker as follows: publish("Published String"); Now to update the JLabel, I have coded the following: process(List<String> chunks) { if (chunks.size() > 0) { String text = chunks.get(chunks.size() - 1); label.setText(text); } } The above code works but my problem(or to be more specific, my doubt) is as follows: The above swing worker task is an annonymous inner class so it can access label field. But what if I want to make the swing worker class a non-inner class. Should I need to pass label as an argument to the constructor of swing worker class so that the process() method can access. Or Is there any other way? What approach does other developer follow to update UI components from the swing worker class' result when the swing worker class is not an inner class?

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• What CPAN module can summarize Perl error logs?

  - by mithaldu

  I'm maintaining some website code that will soon dump all its errors and warnings into a log file. In order to make this a bit more pro-active I plan to parse this log file daily, summarize the warnings and errors (i.e. count the occurrence of each specific one and group by either warning/error) and then email this to the devs on the project. This would likely admittedly be rather trivial with a hash and some further fiddling, I wondered if there is a suitable module on CPAN that I could use to do this task. It would either be one that summarizes specifically Perl error/warnings logs or one that summarizes arbitrary text files. Any suggestions?

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• how to fill a part of a circle using PIL?

  - by valya

  hello. I'm trying to use PIL for a task but the result is very dirty. What I'm doing is trying to fill a part of a piece of a circle, as you can see on the image. Here is my code: def gen_image(values): side = 568 margin = 47 image = Image.open(settings.MEDIA_ROOT + "/i/promo_circle.jpg") draw = ImageDraw.Draw(image) draw.ellipse((margin, margin, side-margin, side-margin), outline="white") center = side/2 r = side/2 - margin cnt = len(values) for n in xrange(cnt): angle = n*(360.0/cnt) - 90 next_angle = (n+1)*(360.0/cnt) - 90 nr = (r * values[n] / 5) max_r = r min_r = nr for cr in xrange(min_r*10, max_r*10): cr = cr/10.0 draw.arc((side/2-cr, side/2-cr, side/2+cr, side/2+cr), angle, next_angle, fill="white") return image

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• Moving from VPS to Cloud

  - by GRIGORE-TURBODISEL

  ...and I have a few questions. I'm basically working on a MySQL+PHP based webapp. Since I don't have on-demand scaling with VPS, I'm planning to move from VPS to Cloud when I hit the 1000 subscribers barrier. I'm looking at Windows Azure but I'm ok with other suggestions. So here are my questions: Will it really cost me a kidney? Every subscriber needs to download around 4-5MB of static resources each day. Bandwidth is free on the VPS but here I see costs can easily get to $800.00/mo; this makes me very insecure about the whole thing, I mean VPS is just $2,000/yr. Do I need another VM or is PHP included in the Web Sites? I have basic sysadmin skills, I think I can handle setting up a PHP install, but will I have to do this? If yes, what other service do I need to setup manually? What about Memcached, MySQL, etc? What security protections does it include? For example I have some basic protection included, like directory traversals and executable files upload; I also have CloudFlare on my other websites for DDoS protection; will I need to do the same thing here too, can it even be installed, can I edit my DNS records, etc? How are e-mails, subdomains, add-on domains, parked domains, etc. handled? I haven't seen any references to e-mail boxes. On the VPS I simply add them from cPanel ([email protected] / whatever.mysite.com / ...); do I have a similar management interface here? Do I get SSH access? Or at least FTP, remote MySQL access and maybe some incremental back-ups or something? Can I see my quotas and advanced traffic info? I must mention that I really like the idea of the whole "cloud" concept, the added reliability and everything but I really need maybe a parallel to regular hosting or something so I know what to expect.

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• converting NSTimer running not on main runloop to GCD

  - by Justin Galzic

  I have a task that runs periodically and it was originally designed to run on a separate run loop than the main runloop using NSThread and NSTimer. What's the best way to adapt this to take advantage of GCD? Current code: -(void)initiateSomeTask { [NSThread detachNewThreadSelector:@selector(startTimerTask) toTarget:self withObject:nil]; } -(void)startTimerTask { // We won't get back the main runloop since we're on a new thread NSRunLoop *myRunLoop = [NSRunLoop currentRunLoop]; NSPort *myPort = [NSMachPort port]; [myRunLoop addPort:myPort forMode:NSDefaultRunLoopMode]; NSTimer *myTimer = [NSTimer timerWithTimeInterval:10 /* seconds */ target:self selector:@selector(doMyTaskMethod) userInfo:nil repeats:YES]; [myRunLoop addTimer:myTimer forMode:NSRunLoopCommonModes]; [myRunLoop run]; } Is there anything I can do besides replace detachNewThreadSelector with dispatch_async?

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• Garbage collection - manually wiping EVERYTHING!

  - by Glycerine

  I have been building a game for a while (nearly done) - But the game needs a replay button and its a big task. I know the GC is dreadful in flash, but I wanted to know if there is a way to wipe EVERYTHING as if the flash app has just begun. Clearing memory, game data - I haven't to worry about game loading as its not really heavy on data. Everything pretty much lives in a DataModel - but I fear if I just clear the all variables, I'll have pockets of orphaned memory. Any forwarding idea would be great. cheers guys.

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• Speech recognition with Flash or Silverlight

  - by Sebastián Grignoli

  I'm developing a web user interface to enter some information that is not very complex but needs to be loaded in real time. I think that the application could make use of speech recognition to facilitate the task. Te core of the interface is being built with Javascript and jQuery, but can easily include a flash or silverlight component. I believe that´s probably the way to go... I don't need to recognize everything that the user says, but only a few prerecorded commands. Also, I don't want the user to click on a button to specify the begining and the end of the spoken command. It should be detected live. Is there anything that does this? I would be grateful if anyone tells me about a complete solution, free or commercial, as well as any advice on capturing a sound stream from the mic and process it with flash or sliverlight. Sebastian.-

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• Getting "stack level too deep" error when deploying with Capistrano, Rails 3.1 ruby 1.9.2

  - by Victor S

  Here is the log for the cap deploy script output around where the error occurs. Anny suggestions why this might be happening? Thanks! [yup.la] executing command [yup.la] sh -c 'cd /srv/www/portrait/releases/20120406051647 && bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile' ** [out :: yup.la] rake aborted! ** [out :: yup.la] ** [out :: yup.la] stack level too deep ** [out :: yup.la] (in /srv/www/portrait/releases/20120406051647/app/assets/stylesheets/mobile.css.scss) ** [out :: yup.la] ** [out :: yup.la] Tasks: TOP => assets:precompile:primary ** [out :: yup.la] (See full trace by running task with --trace) ** [out :: yup.la] command finished in 30868ms *** [deploy:update_code] rolling back * executing "rm -rf /srv/www/portrait/releases/20120406051647; true" servers: ["yup.la"] [yup.la] executing command [yup.la] sh -c 'rm -rf /srv/www/portrait/releases/20120406051647; true' command finished in 288ms failed: "sh -c 'cd /srv/www/portrait/releases/20120406051647 && bundle exec rake RAILS_ENV=production RAILS_GROUPS=assets assets:precompile'" on yup.la /Users/victorstan/Sites/portrait ?

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• FileInputStream for a generic file System

  - by Akhil

  I have a file that contains java serialized objects like "Vector". I have stored this file over Hadoop Distributed File System(HDFS). Now I intend to read this file (using method readObject) in one of the map task. I suppose FileInputStream in = new FileInputStream("hdfs/path/to/file"); wont' work as the file is stored over HDFS. So I thought of using org.apache.hadoop.fs.FileSystem class. But Unfortunately it does not have any method that returns FileInputStream. All it has is a method that returns FSDataInputStream but I want a inputstream that can read serialized java objects like vector from a file rather than just primitive data types that FSDataInputStream would do. Please help!

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