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• Rails: Generated tokens missing occasionally

  - by Vincent Chan

  We generate an unique token for each user and store it on database. Everything is working fine in the local environment. However, after we upload the codes to the production server on Engine Yard, things become weird. We tried to register an account right after the deploy. It is working fine and we can see the token in the db. But after that, when we register new accounts, we cannot see any tokens. We only have NULL in the db. Not sure what caused this problem because we can't re-produce this in the local machine. Thanks for your help.

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• Viewing, building & debugging Borland C++ Builder project in Visual Studio 2010

  - by grunt

  I would like to use VC2010 to handle a BCB 2006 project I have. I do not want to convert the code to VC since much UI will need to be ported. I just want to be able to view build & debug from VS IDE. Viewing: I assume once I create VS projects for the native BCB code viewing will be possible, although the UI editor will not. Building: I found the "C++ Native Multi-Targeting" option of VS, although I'm not sure on what to set the different options there to (Daffodil is mentioned as helpful although I'm not sure what the added value is over existing functionality). Debugging: not sure how to do this at all from within VS. There are some stand alone console tools that convert debug info files e.g. tds2pdb (wheres the documentation link?). If anyone has experience with such a task I would thank you for any advice.

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• bad performance from too many caught errors?

  - by Christopher Klein

  I have a large project in C# (.NET 2.0) which contains very large chunks of code generated by SubSonic. Is a try-catch like this causing a horrible performance hit? for (int x = 0; x < identifiers.Count; x++) {decimal target = 0; try { target = Convert.ToDecimal(assets[x + identifiers.Count * 2]); // target % } catch { targetEmpty = true; }} What is happening is if the given field that is being passed in is not something that can be converted to a decimal it sets a flag which is then used further along in the record to determine something else. The problem is that the application is literally throwing 10s of thousands of exceptions as I am parsing through 30k records. The process as a whole takes almost 10 minutes for everything and my overall task is to improve that time some and this seemed like easy hanging fruit if its a bad design idea. Any thoughts would be helpful (be kind, its been a miserable day) thanks, Chris

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• Use Tomcat with Java SecurityManager?

  - by pauline

  I'm writing a web application that is supposed to run on Tomcat on Ubuntu. On Ubuntu, Tomcat is per default configured to run with the Java SecurityManager. Besides my own web application, there will only be some well known third party web applications related to my own, like the BIRT report engine. If one of the web applications fails or gets compromised, it may take down all the others without harm, because they all belong together. What I don't wont to happen is that a compromised web app compromises the system itself, like calling rm -r / Do I need to use the java security manager to achieve this? Or is it only necessary to protect one web app from the other? I'd really like to prevent the effort to create .policy files for all the 3rd party web applications I intend to use.

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• Is it possible to install IDLE on Python 2.5 and Ubuntu

  - by broiyan

  Ubuntu Software Center offers versions of IDLE numbered 2.6 and upwards. If I have to use Python 2.5 (because of Google App Engine compatibility), will it be possible to still use IDLE? I am of course assuming that the there is some necessity for the IDLE version number to be the same as the Python version number. Presently, my invocations of IDLE fail because of _tkinter not being found. Likewise it is not found when I try to do an import _tkinter interactively. I then proceeded to install Tcl and Tk and python-tk and one of the IDLE versions being offered (none were labelled 2.5) but _tkinter still does not get imported.

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• GenerateBootstrapper fails to create a working setup.exe

  - by Darren

  I’m seeing some odd behaviour I can’t explain. I'm using wix to generate a msi and using the msbuild GenerateBootstrapper task to handle pre-requisites. It all seems to build correctly i.e. there are no error or warnings but the generated setup.exe won’t run. It gives a nice blank error dialog and the event log gives about the same information. The kicker is that if I drop to the command line and run msbuild manually on the project and specify the bootstrapper target it generates a correct and working setup.exe. I've used this wix article as a base and a number of questions on StackOverflow to no avail. Has anyone seen this behaviour before, better still a fix?

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• How do I manage report paging in HTML?

  - by ProfK

  I have a small, custom crafted HTML report, not using any reporting engine, for various reasons. The client's layout is quite handy, as each report section fits on its own page, so I have one div for each page, with a CSS class of .page, setting A4 dimensions with margin, and a header image. Each 'page' also has a small header table just under the header image, and a section heading label. Now, some sections threaten to overflow their page, and I'm looking at ways to handle this. One clumsy approach is to include a second page for those sections that might overflow, and delete these pages before rendering if they are empty. If I do this, how can I 'tell' content on one page to overflow into the next page? The report is finished and a once off effort, so I'm not keen to convert it into a SSRS or Telerik report just to achieve this paging.

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• Programming with midi, and tuning notes to specific frequencies

  - by froggie0106

  I am working on a project in which I need to be able to generate midi notes of varying frequencies with as much accuracy as possible. I originally tried to write my program in Java, but it turns out that the sound.midi package does not support changing the tunings of notes unless the frequencies are Equal Tempered frequencies (or at least it didn't in 1.4, and I haven't been able to find evidence that this has been fixed in recent versions). I have been trying to find a more appropriate language/library to accomplish this task, but since this is my first time programming with MIDI and my need for specific tuning functionality is essential, I have been having considerable trouble finding exactly what I need. I am looking for advice from people who have experience writing MIDI programs as to what languages are useful, especially for tuning notes to specific frequencies. Any links to websites with API docs and example code would also be extremely helpful.

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• Are there plans to make a non-programming general version of StackOverFlow like Yahoo Answer! [close

  - by RoboShop

  Firstly, I would like to say I think StackOverflow is a really great website, not just from a content perspective, but from a design perspective. The UI is designed in a way that makes it easy to use and the points are great incentives to be a productive part of the community. I was wondering, is there a part of the site, or maybe is there plans to make a new site, which is not programming driven. Like a general knowledge site but with StackOverflow as the engine. I use sites like Yahoo Answer! and they can be useful. But I think the main difference between Stack Overflow and Yahoo Answer is that Yahoo Answer encourages content indiscriminately, whereas Stack Overflow is disciplined enough that it only encourages content that are helpful or useful. I find it great that I can load up a question and the best answer pops up immediately, and the bad answers are voted down. Thanks

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• Delete backup files older than 7 days

  - by rockbala

  Using osql command, SSQL backup of a database is created. It is saved to Disk. Then renamed to match the date of the day backup was taken. All these files are saved in a single folder all the time. for example: Batch1.bat does the following 1) Created backup.bak 2) renamed to backup 12-13-2009.bak (this is done by the combination of % ~ - etc to get the date parameter) This is now automated to take backup everyday by Task scheduler in Windows. Can the batch file also be modified to delete backup files older than 7 days? if so, how ? If it is not possible via batch file, other than manually deleting the files are there any other alternatives to automate the deleting job ? Thanks in advance, Balaji S

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• Java Spring 3.0 MVC Annotation vs COC. Whats the preferred method in the Java community?

  - by Athens

  I am using Spring's MVC framework for an application I'm hosting on Google's App Engine. So far, my controllers are registered via the @Controller annotation; however, prior to getting into Spring, I evaluated ASP.net MVC 2 which requires no configuration and is based on convention. Is convention over configuration (COC) the current and preferred method in the Java community to implement MVC with Spring. Also, this may be a result of my limited knowledge so far but i noticed that i could only instantiate my Controllers the required constuctor injection if i use the COC method via the ControllerClassNameHandlerMapping. For instance the following controller bean config will fail if i use the defaultannotationhandlermapping. <bean id="c" class="com.domain.TestController"> <constructor-arg ref="service" /> </bean> <bean id="service" class="com.domain.Service" /> My com.domain.TestController controller works fine if i use ControllerClassNameHandlerMapping/COC but it results in an error when i use defaultannotationhandlermapping/Annotations.

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• 3-legged-oauth and Google ContactsClient problem

  - by PanosJee

  Hi I am using 3-legged-oauth to import a users' Google contacts in my app. I did not find the ContactsClient library but i was using only the ContacsService and i was fetching the ContactsFeed but that resulted to not having a lot of data. After the user allows my apps i store the auth_token key and secret so i can run a cron task to fetch contacts' updates I am using this code atm: google = gdata.contacts.service.ContactsService(source=GOOGLE_OAUTH_SETTINGS['APP_NAME']) google.SetOAuthInputParameters(GOOGLE_OAUTH_SETTINGS['SIG_METHOD'], GOOGLE_OAUTH_SETTINGS['CONSUMER_KEY'], consumer_secret=GOOGLE_OAUTH_SETTINGS['CONSUMER_SECRET']) access_token = gdata.auth.OAuthToken(user_oauth_token, user_oauth_secret) access_token.oauth_input_params = google.GetOAuthInputParameters() google.SetOAuthToken(access_token) feed = google.GetContactsFeed() When i try to use the contacts client contacts_client = gdata.contacts.client.ContactsClient( source=GOOGLE_OAUTH_SETTINGS['APP_NAME']) feed2 = contacts_client.GetContacts(auth_token = access_token) I get the following error (please note that the access_token is the same as above and I user 3-legged-oauth HMAC) Actual results: File "/Library/Python/2.5/site-packages/atom/client.py", line 108, in request auth_token.modify_request(http_request)

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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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• Guidelines for good webcrawler 'Etiquette'

  - by Harry

  I'm building a search engine (for fun) and it has just struck me that potentially my little project might wreak havok by clicking on ads and all sorts of problems. So what are the guidelines for good webcrawler 'Etiquette'? Things that spring to mind: Observe Robot.txt instructions Limit the number of simultaneous requests to the same domain Don't follow ad links? Stopping the crawler from clicking on ads - This one is particularly on my mind at the moment... how do i stop my bot from 'clicking' on ads? if it is going straight to the url in the ad is it counted as a click?

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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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• Extremely basic PHP and Mysql

  - by fighella

  Background: I am more of a designer than a programmer, but have hacked templates for many open source CMS's (Drupal, Joomla, Wordpress) I want to start from scratch in regards to the relations of php and a mysql database. Lets assume I have a working database and php engine locally. What would be my first step to connecting to my database and creating a table... (im happy to be led to an appropriate tutorial...) Many of the tutorials I have seen start with basic php, but I would rather explore the connection between the db and the php.

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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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• Easy way to parse a url in C++ cross platform?

  - by Andrew Bucknell

  I need to parse a url to get the protocol host path and query in an application I am writing in c++. The application is intended to be cross platform. Im surprised I cant find anything that does this in boost or poco libraries. Is it somewhere obvious Im not looking? Any suggestions on appropriate open source libs? Or is this something I just have to do my self? Its not super complicated but it seems such a common task I am surprised there isnt a common solution.

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• Redirect in combination with a rewrite condition in htaccess

  - by Robbert van den Bogerd

  Hi all! I've got a cms-driven website, with no option to change the code. What I want to accomplish is creating friendly url's, using only apaches mod-rewrite engine. The problem is I'm creating an infinite loop, because I first redirect the original url (index.php?id=21) to a friendly one (/friendly/) and then rewrite the '/friendly' part back to 'id=21' I know there should be an extra condition or parameter to avoid looping in this case, but I can´t get one of the possible solutions to work. Here´s the code: RewriteCond %{query_string} ^id=21$ [NC] RewriteRule /* /peuterspeelzaal? [R=301,L] RewriteRule ^peuterspeelzaal$ index.php?id=21 [L]

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• Building a minimal plugin architecture in Python.

  - by dF

  I have an application, written in Python, which is used by a fairly technical audience (scientists). I'm looking for a good way to make the application extensible by the users, i.e. a scripting/plugin architecture. I am looking for something extremely lightweight. Most scripts, or plugins, are not going to be developed and distributed by a third-party and installed, but are going to be something whipped up by a user in a few minutes to automate a repeating task, add support for a file format, etc. So plugins should have the absolute minimum boilerplate code, and require no 'installation' other than copying to a folder (so something like setuptools entry points, or the Zope plugin architecture seems like too much.) Are there any systems like this already out there, or any projects that implement a similar scheme that I should look at for ideas / inspiration?

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• Python Scraper for Javascript?

  - by Diego

  Hey all, Can anyone direct me to a good Python screen scraping library for javascript code (hopefully one with good documentation/tutorials)? I'd like to see what options are out there, but most of all the easiest to learn with fastest results... wondering if anyone had experience. I've heard some stuff about spidermonkey, but maybe there are better ones out there? Specifically, I use BeautifulSoup and Mechanize to get to here, but need a way to open the javascript popup, submit data, and download/parse the results in the javascript popup. <a href="javascript:openFindItem(12510109)" onclick="s_objectID=&quot;javascript:openFindItem(12510109)_1&quot;;return this.s_oc?this.s_oc(e):true">Find Item</a> I'd like to implement this with Google App engine and Django. Thanks!

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• Does all SPWeb or SPSite instances automatically disposed when console app process has ended?

  - by Janis Veinbergs

  We have Best practices on using disposable object in SharePoint. But i`m thinking - can I skip these when using Console Application? That's some code I want to execute once and after that process has finished. Do or don't SPSite and SPWeb's remain opened somwhere? Why i`m asking this? I just don't want to stress when using something like var lists = from web in site.AllWebs.Cast<SPWeb>() where web is meeting workspace && list is task list select list then do some stuff on lists etc. Some serious resource leak there because webs get opened, filtered and NOT closed. So should I worry in console app?

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• InnoDB or MyISAM - Why not both?

  - by Skoder

  Hey. I'm new to databases, and I've read various threads about which is better between InnoDB and MyISAM. It seems that the debates are to use or the other. Is it not possible to use both, depending on the table? What would be the disadvantages in doing this? As far as I can tell, the engine can be set during the CREATE TABLE command. Therefore, certain tables which are often read can be set to MyISAM, but tables that need transaction support can use InnoDB. I'm sure there must be a problem, otherwise this would be the ultimate answer :).

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• Is being a programmer a younger person's job?

  - by Saobi

  After you get old, say past 30 or 40. Can you still keep up with the young coders from your company, those fresh out of school, who can code for 15+ hours on 10 cans of redbulls (most people in Google, Facebook, etc) ? And given the lightning speed with which today's programming frameworks and architectures evolve, can you keep up with the most up to date stuff and be as proficient at them as the next college grad? I know for jobs like unix/c/embedded programming, it might be that the older the better. But for programming jobs in say web development, social media, search engine technology, etc. Do you become less and less competitive career-wise versus youngsters? For example, most coders in Google and Facebook, I believe are under 25 years old. In other words, once you reach a certain age, would it be unwise to continue to be a coder, and is it better to try becoming a project manager or architect?

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• Django Asynchronous Processing

  - by freyrs

  Hello all, I have a bunch of Django requests which executes some mathematical computations ( written in C and executed via a Cython module ) which may take an indeterminate amount ( on the order of 1 second ) of time to execute. Also the requests don't need to access the database. Right now everything is synchronous ( using Gunicorn with sync worker types ) but I'd like to make this asynchronous and nonblocking. I am very new to asynchronous Django, and so my question is what is the best stack for doing this. Is this sort of process something a task queue is well suited for? Would anyone recommend Tornado + Celery + RabbitMQ, or perhaps something else? Thanks in advance!

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