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• Barcode reading method?

  - by Atlas

  I recently acquired a Metrologic Barcode scanner (USB port), as everyone already knows it works as a keyboard emulator out of the box. Now my question, how do I configure the scanner and my application, so that my app can process the barcode data directly. That is, I don't want the user to focus on a "Text field" and then process the data when the KeyPress event fires.

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• iOS: how to understand the role of rootviewcontroller and its relationship with other objects

  - by Anthony Kong

  I have created a UISplitViewController based iOS app in XCode 3.2.5 Below is a screen shot of Interface builder showing the rootviewcontroller and how it is linked to other objects. Being a beginner myself, I do not understand: 1) What is the role of the rootviewcontroller? Searched the documentation but what I found did not answer this question. 2) I thought a IBOutlet should only link to one corresponding object. Why in this case the rootviewcontroller is linked to two?

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• Some problem of UINavigationController's parentViewController

  - by www.ruu.cc

  navController is class of UINavigationController, I add it to a view whose controller is uiviewcontroller1: [uiviewcontroller1.view addSubview:navController.view]; Now, my question is whose is the navController's parentViewController? (uiviewcontroller1 != navController.parentViewController) is true?

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• initialize a const array in a class initializer in C++

  - by Nathan Fellman

  I have the following class in C++: class a { const int b[2]; // other stuff follows // and here's the constructor a(void); } The question is, how do I initialize b in the initialization list, given that I can't initialize it inside the body of the function of the constructor, because b is const? This doesn't work: a::a(void) : b([2,3]) { // other initialization stuff } Edit: The case in point is when I can have different values for b for different instances, but the values are known to be constant for the lifetime of the instance.

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• Python: if key in dict vs. try/except

  - by LeeMobile

  I have a question about idioms and readability, and there seems to be a clash of Python philosophies for this particular case: I want to build dictionary A from dictionary B. If a specific key does not exist in B, then do nothing and continue on. Which way is better? try: A["blah"] = B["blah"] except KeyError: pass or if "blah" in B: A["blah"] = B["blah"] "Do and ask for forgiveness" vs. "simplicity and explicitness". Which is better and why?

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• How does Object Oriented Programming work?

  - by venom

  Hello, I am not sure about some things in OOP. If I have Class1, which has some private field, for example private Field field1, and make getField1 () { return field1; } then I have some class with constructor public Class2 (Field field) { someMethod(field); } And then I call constructor of Class2 in Class3 like: Class2 cl = new Class2(instanceOfClass1.getField1()); And now the question: Am I working with field1 of instanceOfClass1 in someMethod(field)?

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• OpenEntityManagerInViewFilter and testing the presence of an EntityManager

  - by James P.

  I posted a question a few days ago mentionning Spring's OpenEntityManagerInViewFilter: http://stackoverflow.com/questions/2385858/uirepeat-inside-a-uirepeat-and-lazyinitexception An obvious thing that should have been asked and now comes to mind is how to test for the presence of an EntityManager in a JSF project. What is a good way of doing this?

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• what does '-' stand for in bash?

  - by trybeingarun

  Hi, What exactly are the uses of '-' in bash? I know they can be used for 1. cd - # to take you to the old 'present working directory' 2. some stream generating command | vim - # somehow vim gets the text. My question is what exactly is - in bash? In what other contexts can I use it? Regards Arun

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• help on integrating oracle BI into existing application

  - by ywang1129

  I have an existing application written in perl. Now i need to integrate this application with ocbi. The plan is having button that user can click on to open ocbi in iframe. The ocbi resides on a different server from the running application. Has anyone done this before, know what is the best practice of doing this, and what is the effort of doing this. another question is is it possible to add customize the ocbi displayed in iframe. thanks

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• lisp, differences in assignment functions

  - by johnc

  I'm pretty new to lisp, so apologies for what may be a simple question, Whilst I understand the difference between DEFVAR and DEFPARAMETER (defvar only sets undefined variables), and the LET is for local scope only, what is the is the use of SETF as opposed to the other, previously mentioned assignment functions?

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• quick to setup version control that integrates well with VS2010

  - by raklos

  I've got to a point where i want to start using version control for my project. Mainly for reverting to previous versions of files if things go belly up, doing diff comparisons. Nothing major. I want something that integrates well with visual studio, and something thats relatively simple to setup. - prefereably with a link to a tutorial for setting up would be nice. Im just using my pc for this so something like TFS is out of the question.

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• What is this syntax #[] in REBOL?

  - by Gregory Higley

  In another question, I saw the following syntax: #[unset!] What is that? If I say type? #[unset!] in R3, it tells me unset!, but it doesn't solve the mystery of what #[] is. So curious.

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• which is better ? Python or C++?

  - by drfacundo

  Hi boys, im newest... I've got a simple question... wich is better? Python or C++? I wanna study computational science, and i like algorithms and TAD analyses... what do you prefer?

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• How to pass an Array object to the setInterval function

  - by coderex

  I want to pass an object array to the setTimer function in Javascript. setTimer("foo(object_array)",1000); am getting error on this code. Note:Sorry ! some correction in my question : Is it possible in setInterval() function.

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• SVG Scaling Text to fit container

  - by Tom

  This is likely a very simple question, but how do I get text in SVG to stretch to fit its container? I don't care if it looks ugly from being stretched too long or high, but it needs to fits its container and be as big as possible. Thanks

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• Is there a template engine for Node.js?

  - by Seb

  I'm kind of falling in love with Node.js not because you write app code in javascript but because of its performance. I really don't care a lot about how beautiful a server side language might be but how much requests per second it can handle. So anyway I'm looking forward to experiment building an entire webapp using Node.js (and going back to the actual question) is there a template engine similar to let's say the django template engine or something similar (that at least allows you to extend base templates) available for Node.js?

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• how to do new lines? [ textarea -> jquery -> p tag ]

  - by Haroldo

  I'm doing something very similar to the stackoverflow question preview only much more basic. user types in text area - keyup shows what they've typed in preview new lines aren't working $('input, textarea').keyup(function(){ var value = $this.attr('value').replace('\n', '<br />').replace('\r', '<br />'); $('p.preview').html(value); })

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• Books on Debugging Techniques?

  - by zooropa

  Are there any books on debugging techniques? A friend of mine is learning to code and he asked me this question. I told him I don't know of any. Is it that you just have to go through the School of Hard Knocks to learn?

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• How does Python store lists internally?

  - by Mike Cooper

  How are lists in python stored internally? Is it an array? A linked list? Something else? Or does the interpreter guess at the right structure for each instance based on length, etc. If the question is implementation dependent, what about the classic CPython?

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• vb and ado dot net have good scope? the company that offer me a job only works on that technology

  - by Senthil

  might be repetitive question..please answer guys 1.the company that offer me a job only works on vb and ado.net technology I'm new to dotnet. I dont know about it..So tell me about the scope,?Is it good to say yes to my employer? 2.after 2 years of experience in that , will i still can get a good job, ? 3..Most of the companies still using vb and ado.net?

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• can i use hadoop cloudera without root access?

  - by in_the_cloud

  a bit of a binary question (okay, not excatly) - but was wondering if one is able to configure cloudera / hadoop to run at the nodes without root shell access to the node computers (although i can setup ssh passwordless login)? appears from their instructions that root access is needed, at yet i found a hadoop wiki which suggest root access might not be needed ? http://wiki.apache.org/nutch/NutchHadoopTutorial

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• Building a life-critical System using Agile

  - by Ben Breen

  Looking at the general trend of comments in my question about Building an Aircraft using Agile, the biggest problem other than cost appears to be safety. Do people feel that it is not possible to build a safe system (or prove it is safe) using agile? Doesn’t all the iterative testing mitigate this? Is it likely that a piece of software developed using agile will never be as reliable as counterparts such as waterfall?

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• Should I learn a operating system specific language or something like Java?

  - by Ben Ratajesak

  I am torn. I want to start making applications for OS X. There is a specifically under-served market that I would like to tap but I don't know if I should develop it only for the mac with Cocoa and Objective C or if I should develop it with Java and JavaFX. I guess my question is, is Java robust enough to handle the same things as Objective C on Mac and C# (.net) on Windows?

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• best way to find out type

  - by laspal

  hi, I have a dict val_dict - {'val1': 'abcd', 'val': '1234', 'val3': '1234.00', 'val4': '1abcd 2gfff'} All the values to my keys are string. So my question is how to find out type for my values in the dict. I mean if i say`int(val_dict['val1']) will give me error. Basically what I am trying to do is find out if the string is actual string or int or float.` if int( val_dict['val1'): dosomething else if float(val_dict['val1']): dosomething thanks

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• how do i "View in browser" a mvc 2 app?

  - by wcpro

  this is probably a pretty simple question, but i don't see how to view in browser like i would for a traditional asp.net application.

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