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• Hidden features of Ruby

  - by squadette

  Continuing the "Hidden features of ..." meme, let's share the lesser-known but useful features of Ruby programming language. Try to limit this discussion with core Ruby, without any Ruby on Rails stuff. See also: Hidden features of C# Hidden features of Java Hidden features of JavaScript Hidden features of Ruby on Rails (Please, just one hidden feature per answer.) Thank you

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• How does this print stylesheet work?

  - by Martin

  I really like how http://www.honorshaven.com/ looks printed (to pdf). I've looked through the source to try to figure out how they did it (my navigation always turns into ugly bullet lists on print...) -- and I'm at a loss. Anyone know? Any help would be awesome! Thanks, Martin

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• Oracle ALTER DATABASE OPEN

  - by Tom

  Hi everyone, Im having some trouble with an oracle database. Every time i try to connect, i get this message. ORA-01033: ORACLE initialization or shutdown in progress I searched the web, and found that the solution is to execute an alter database open command, but what I dont understand is where should i execute if, since I cant connect to the database. Am I missing something? Thanks in advance

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• How to compile OpenGL with a python C++ extension using distutils on Mac OSX?

  - by Matthew Mitchell

  When I try it I get: ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/cscalelib.so, 2): Symbol not found: _glBindFramebufferEXT Referenced from: /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/cscalelib.so Expected in: dynamic lookup I've tried all sort of things in the setup.py file. What do I actually need to put in it to link to OpenGL properly? My code compiles fine so there's no point putting that on there.

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• What C++ library do I need to get this program to compile

  - by Phenom

  When I try to compile my program I get these errors: btio.c:19: error: ‘O_RDWR’ was not declared in this scope btio.c:19: error: ‘open’ was not declared in this scope btio.c: In function ‘short int create_tree()’: btio.c:56: error: ‘creat’ was not declared in this scope btio.c: In function ‘short int create_tree(int, int)’: btio.c:71: error: ‘creat’ was not declared in this scope what library do I need to include to fix these errors?

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• Which languages are dynamically typed and compiled (and which are statically typed and interpreted)?

  - by Skilldrick

  In my reading on dynamic and static typing, I keep coming up against the assumption that statically typed languages are compiled, while dynamically typed languages are interpreted. I know that in general this is true, but I'm interested in the exceptions. I'd really like someone to not only give some examples of these exceptions, but try to explain why it was decided that these languages should work in this way.

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• Using pointers in PHP.

  - by Babiker

  I ask this question because i learned that in programming and designing, you must have a good reason for decisions. I am php learner and i am at a crossroad here, i am using simple incrementation to try to get what im askin across. I am certainly not here to start a debate about the pros/cons of pointers but when it comes to php, which is the better programming practice: function increment(&$param) { $param++; } Or function increment($param){ return $param++; } $param = increment($param);

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• SELECT INTO and "Undeclared variable" error

  - by hsz

  Hello ! When I try to execute following querry: SELECT id_subscriber INTO newsletter_to_send FROM subscribers I get an error: #1327 - Undeclared variable: newsletter_to_send What is wrong with that query ?

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• Crystal Report deployment error

  - by Gold

  i have C# program that works with Oracle 11g when it works on my computer all works excellent but when its run on the customer computer - the connection to Oracle work good but when i try to run any Crystal-Report i get this error: Could not load file or assembly CrystalDecisions.windows.forms.version = 10.5.3700.0. culture = neutral.publicKey Token = 69fbea5521e1304 or one of its dependencies. The system cannot find the specified thank's for any help

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• inheritance from str or int

  - by wiso

  Why I have problem creating a class the inherite from str (or also int) class C(str): def __init__(self, a, b): str.__init__(self,a) self.b = b C("a", "B") TypeError: str() takes at most 1 argument (2 given) tha same appened if I try to use int instead of str, but it works with custom classes. I need to use __new__ instead of __init__? why?

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• JTwitter OAuth with callback authorisation

  - by RenegadeAndy

  Hey guys. I am writing an App using JTwitter however I need to authenticate in order to not have the 150 requests per minute on the public api. Jtwitter seems to support OAuth however I have some questions. My app will be running behind a company firewall - so the URL wont be accessible outside of the company's network - will callback authorisation work, and does anybody have an example of using callback authorisation using OAuth in JTwitter - because I cannot work it out in order to try it. Cheers, Andy

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• Opengraph W3C valid ?

  - by mnml

  Hi, I would like to know if the opengraph markup is W3C valid, I'm getting the following error when I try to validate it: Line 14, Column 17: there is no attribute "PROPERTY" <meta property="og:site_name" content="sitename"> In case it's not valid, will it impact my pagerank and other search engines algo? Is it possible to cloak those properties?

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• Problem about Chrome Extension

  - by Gnu

  Hi! I try to write an extension and i saw the very restricted policy security. I should create an extension that allows me to listen and download podcast from web. It is possible? I use Chrome OS with VMWare, this OS has additional Api than Google Chrome Browser? Thanks

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• Is it possible to auto-regenerate and load tags table in emacs rather than having to keep running vi

  - by anair

  I am trying to find a way to auto-regenerate tags for my application and visit those tags in emacs to try to improve my workflow. Is it possible to get emacs to detect changes in TAG file and re-visit it ?

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• random quote generator in php using mysql

  - by fusion

  i coded a random quote generator in php using mysql but also jquery. however when i try to integrate it with facebook, since i opted to use fbml, i could not use jquery. how do i get the quote to display randomly in php at say, 30 mins, without using jquery or javascript?

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• Overload operator in F#

  - by forki23

  Hi, I would like to overload the (/) operator in F# for strings and preserve the meaning for numbers. /// Combines to path strings let (/) path1 path2 = Path.Combine(path1,path2) let x = 3 / 4 // doesn't compile If I try the following I get "Warning 29 Extension members cannot provide operator overloads. Consider defining the operator as part of the type definition instead." /// Combines to path strings type System.String with static member (/) (path1,path2) = Path.Combine(path1,path2) Any ideas? Regards, forki

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• Logoff User when browser tab page is closed, ASP.NET MVC

  - by Gopinath

  In one of the ASP.NET MVC apps we would like to logoff the user automatically if he closes the browser tab in which the app is opened. We are using the following code when he authenticates. FormsAuthentication.SetAuthCookie(userName, false) As of now, if we closes the browser window and relaunch it, users are asked to authenticate again. But we want to ask users to authenticate again if they close the tab and try to access any of the website urls.

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• How to catch exception in the main thread if the exception occurs in the secondary thread?

  - by Ashish Ashu

  How to catch exception in the main thread if the exception occurs in the secondary thread? The code snippet for the scenario is given below: private void button1_Click(object sender, EventArgs e) { try { Thread th1 = new Thread(new ThreadStart(Test)); th1.Start(); } catch (Exception) { } } void Test() { for (int i = 0; i < 100; i++) { Thread.Sleep(100); if (i == 2) throw new MyException(); } } }

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• How can I import the System.Linq namespace to Boo?

  - by OmiD Rezaei

  When I try to import the System.Linq namespace to Boo compiler, I get this error: Boo.Lang.Compiler.CompilerError: Namespace 'System.Linq' not found, maybe you forgot to add an assembly reference? I use "Rhino.DSL.dll" and my DSL engine code is here: public class MyDslEngine : DslEngine { protected override void CustomizeCompiler(BooCompiler compiler, CompilerPipeline pipeline, string[] urls) { pipeline.Insert(1, new AnonymousBaseClassCompilerStep(typeof(DslBase), "Prepare", "System.Linq", "Azarakhsh.Framework.Repository" //it's my repository framework )); pipeline.Insert(2, new UseSymbolsStep()); pipeline.Insert(3, new RunScriptCompilerStep()); } }

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• How to unlock a phone? [closed]

  - by Rocker

  Hi everyone. I am not sure here is a good place to ask about how to unlock a phone. But I just try anyway. I have a locked sony ecrison T707 phone. How can I unlock it by code? or any techniques to unlock it? Please give me a hand.... thanks in advance.

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• List<> own comparer

  - by netmajor

  I have a List where element is: struct element { double priority; int value; } How can I implement my own comparer which allow me sort List by priority ? I try with SortredList... but it don't allow douplicated keys :( Big thanks for help!

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• Edit and Continue in Silverlight?

  - by Shnitzel

  Edit-And-Continue is one of my favorite debugging tools which I have previously used on C# based Winforms and ASP.NET projects. However, I'm running a Silverlight 3.0 application on VS 2008 and whenever I try to make a change (after breaking) it says "Changes are not allowed when debugging Silverlight applications". Also there isn't an "Enable Edit and Continue" option in the project settings. Does anyone (possibly an insider) know when this feature will be supported by Microsoft??? (I NEED IT!)

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• Using UNINSTALL_SHORTCUT Intent

  - by Lucas S.

  I am trying to use the following intent action, but i get an ActivityNotFoundException in the fisrt case. And nothing at all in the second case. "com.android.launcher.action.UNINSTALL_SHORTCUT" I try to use it with the following code: Intent i = new Intent ("com.android.launcher.action.UNINSTALL_SHORTCUT"); startActivity(i); Also with the following: Intent i = new Intent ("com.android.launcher.action.UNINSTALL_SHORTCUT"); sendBroadCast(i);

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• Error message for failed new ImageIcon(url)

  - by Carsten

  I try to load an image with: ImageIcon imageIcon = new ImageIcon(url); if I query the load status: imageIcon.getImageLoadStatus(); it returns MediaTracker.ERRORED Is there a way to get an error message saying what the problem was?

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• Need some help with constructor

  - by mousey

  you have a class A, where you set ctor to be private, so a client can't call "A a;" to create obj on stack. But someday another developer add a new ctor: "A(int)" and try to call "A a(1);" inside main(). So this will create a obj on stack. How do you prevent that?

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