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• Difference between Covariance & Contra-variance

  - by jane doe

  I am having trouble understanding the difference between covariance and contravariance. My understanding is one supports out, as in "action" with no return type, which is casting to. The other takes in an argument and is casting from, is this correct?

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• EC2 Instance Available Bandwidth?

  - by Dr.HappyPants

  Is there any way to determine what should be your available bandwidth on EC2? Documentation seems to indicate that it should be based on your instance size, but I'm having a bit of trouble finding any specific numbers.

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• jquery hide certain form elements untill a certain textfield has been populated?

  - by Rubytastic

  I have a long signup form and would like to hide a few fields and only show them when a certain input field is populated with text, if the user types some text in this field the other form fields will show. I have looked at hide and show divs but have some trouble getting form elements hide and show them on a certain trigger ( populating a form with text ) anyone can point me in the right direction on how to implement such feature in query ? thx in advanche!

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• Creating Unix Commands with Xcode

  - by golfromeo

  Hello, I'm trying to make a Terminal Unix command with XCode, and I'm having a little trouble... What I've been doing is creating a "Standard Tool" written in C in XCode, then copying the produced executable to Developer/Tools/. What am I doing wrong? Thanks for any help in advance.

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• Is there a Visual C++ equivalent to gcc --kill-at?

  - by seurimas

  Namely, a DLL name has an extra @8 at the end which is causing trouble. Apparently, using the --kill-at flag in gcc would solve this, but I can't find any similar suggestions for MSVC.

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• How do I use multiple where clauses in GHCi?

  - by T.R.

  I'm playing around with GHCi for the first time, and I'm having some trouble writing multi-line functions. My code is as follows: Prelude> :{ Prelude| let diffSquares lst = abs $ squareOfSums lst - sumOfSquares lst Prelude| where Prelude| squareOfSums lst = (fst (sumsAndSquares lst))^2 Prelude| sumOfSquares lst = snd (sumsAndSquares lst) Prelude| sumsAndSquares = foldl (\(sms,sqrs) x -> (sms+x,sqrs+x^2)) (0,0) Prelude| :} It gives the following error: <interactive>:1:142: parse error on input `=' Could someone kindly point me in the direction of what I'm missing?

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• Quickest way to run a linux dev-environment inside windows

  - by Industrial

  Hi everyone, I get more and more trouble from running WAMP on my XP computer to solve my local development needs. It feels like as more and more things just go wrong or could not be installed at all to a Windows version of PHP. I have been looking for an alternative and found AndLinux plus this link. Would it be a good idea to get an Ubuntu box running virtually on my XP computer to simulate the production web server?

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• Facebook Cucumber testing with Authlogic - how test user logged in as facebook user?

  - by rhh

  I'm having trouble implementing this step: Given "I am logged in as a Facebook user" do end The best suggestions I can find on the web (http://opensoul.org/2009/3/6/testing-facebook-with-cucumber) do not seem to be using Authlogic for authentication. Can someone with the Cucumber/Authlogic_facebook_connect/Authlogic combo post their step for testing facebook logins? Thank you very much.

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• Accessing raw touch data from iPhone screen

  - by Adam

  I know Apple went to a lot of trouble to convert a big blob of touch data to a nice single point, and I appreciate it, but does anyone know how to access the raw data before it's processed? Official or unofficial method, it doesn't matter.

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• In a JTable, how do I render a checkbox column with a dirty marker?

  - by Kevin Stembridge

  Hi all, I'm trying to show a marker on checkbox columns in a JTable to indicate that the value is dirty. I'm having trouble coming up with a way to render the marker. I've tried setting an icon on the JCheckbox but this just renders the icon instead of the checkbox. I've tried using a Panel but it messes up the layout. Does anyone have an idea what is the best way to do this? Thanks

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• Why my jar file build by eclipse cannot run on blackberry???

  - by user315253

  Hello everybody!I build a project in eclipse for my blackberry.I got a trouble that the jar cannot runs on my phone with the error "907 Invaild JAR Descriptor missing required atrribute:MIDlet-1".Need your help.

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• Scraping &#151 character (long dash) error in Nokogiri

  - by DavidP6

  I having trouble scraping a certain long dash that is encoded as — ; on the Time magazine site. It looks like this: —. It works fine when this dash is encoded as mdash, but when the problem dash is scraped, it is returned as unknown characters. I am using Nokogiri and am wondering if I have to use some sort of special encoding? The page says it is encoded with UTF-8.

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• How to store a scaleable sized extensible event log?

  - by firoso

  Hello everyone! I've been contemplating writing a simple "event log" that takes a paramater list and stores event messages in a log file, trouble is, I forsee this file growing to be rather large (assume 1M entries or more) the question is, how can I implement this system without pulling teeth, I know that SQL would be a possible way to go. XML would be ideal but not really practical for scaleability if i'm not going nuts. Example Log Entry -----Time Date-------- ---------Sender----------------------- ---------Tags---------- --Message---------- 12/24/2008 24:00:00 $DOMAIN\SYSTEM\Application$ :Trivial: :Notification: It's Christmas in 1s

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• Problem storing an RSS feed in Flex 4

  - by ben

  Hey guys, I'm having some trouble storing the results of an RSS feed in my Flex 4 app. Here is the variables view, showing the result of the HTTPService which gets the feed: And here is the code I use to store the result: public var rssXML:XML; rssXML = event.result as XML; But after this code is run, rssXML is still null. What am I doing wrong? Thanks for reading.

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• How can i resolve the N+1 Selects problem ?

  - by Maxime ARNSTAMM

  Hello everyone, I have trouble understanding how to avoid the n+1 select in jpa or hibernate. From what i read, there's the 'left join fetch', but i'm not sure if it still works with more than one list (oneToMany).. Could someone explain it to me, or give me a link with a clear complete explanation please ? I'm sorry if this is a noob question, but i can't find a real clear article or doc on this issue. Thanks

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• How would one rotate an image around itself using Canvas?

  - by Wolfr

  I'm having trouble roating an image around itself using Canvas. Since you can't rotate an image you have to rotate the canvas: if I rotate the canvas by a degree the origin around which I want to rotate changes. I don't get how to track this change. This is my current code: http://pastie.org/669023 And a demo is at http://preview.netlashproject.be/cog/ If you want to give things a shot the zipped up code and image is at http://preview.netlashproject.be/cog/cog.zip

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• Flash: Am i totally misunderstanding Event Listening?

  - by Kohan

  I don't know why but i am having trouble getting my head round event dispatching. Take this for example. someClass():Void{ this.addEventListener("onChange",someObj); } Am i right in assuming this means that someClass is listening for an onChange event and when it gets it, it is then going to fire the onChange method on someObj? Thanks, Kohan.

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• Window.open is not working in IE8 fine in firefox.

  - by lakshmi

  I having trouble getting pop-up window in IE. I have used following code. Its works fine in Firefox but not in IE6. Code: com.google.gwt.user.client.Window.open(url, "Admin ", "menubar=no," + "location=false," + "resizable=yes," + "scrollbars=yes," + "status=no," + "dependent=true");; Any Help greatly Appreciated

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• Android Set up Question - Which API Level do I Install?

  - by Greg

  Hi all, I'm trying to set up the Android SDK on Ubuntu. Someday I want to make apps that can reach most of the market. I've heard I need to make the apps compatible with Android 1.6 for this. Does that mean everything I install should be for Android 1.6 (API level 4?). Will I have any trouble running the apps on my phone with is Android 2.1?

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• regular expression for letters, numbers and - _ .

  - by Jorre

  I'm having trouble checking in PHP if a value is is any of the following combinations letters (upper or lowercase) numbers (0-9) underscore (_) dash (-) point (.) no spaces! or other characters a few examples: OK: "screen123.css" OK: "screen-new-file.css" OK: "screen_new.js" NOT OK: "screen new file.css" I guess I need a regex for this, since I need to throw an error when a give string has other characters in it than the ones mentioned above.

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• JSONResult to String

  - by Dustin Laine

  I have a JsonResult that is working fine, and returning JSON from some POCO's. I want to save the JSON as a string in a DB. public JsonResult GetJSON() { JsonResult json = new JsonResult { Data = GetSomPocos() }; return json; } I need to audit the response, so I want to save the json into a DB. I am having trouble finding a way to get the JSON as a string. Any help is appreciated.

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• How to create and add elements in a list in Scheme?

  - by Chris

  I want to define a method that take an integer as input and creates dynamically a list of all descending integer numbers to zero. I find trouble into calling method for the n-1 element

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• BackgroundWorker Thread in IIS7 - FAIL!

  - by Darren Oster

  Just wondering if anyone has had any trouble using a BackgroundWorker Thread in a site running under IIS 7 in Integrated Pipeline mode? I am trying to use such a beast to update the database schema (admin function, obviously), and it works perfectly in Cassini, but when I deploy to IIS 7, the thread gets about one line of code in and silently ends. Is there a way to tell why a thread ended? Thanks in advance.

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• Getting ORA Oracle error code using PHP function oci_connect?

  - by me_here

  The PHP function oci_connect (which connects to an Oracle database) just returns false if it fails, which at the moment I handle like this: $connection = oci_connect($username, $password, $database); if (!$connection){ return $result = "Trouble connecting to the Oracle Database"; } But really I'd like to have the actual ORA error code, so I can be more informative. Is this possible?

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• PHP get a boolean when it is set later in the page

  - by Thomas

  In the header of my page I have a conditional statement to check if $foo boolean is set, the trouble is that the $foo boolean doesn't get set until the footer is loaded. Any way to retroactively check the status of this boolean?

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