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• Is it bad practice to pass instances through several layers?

  - by Puckl

  In my program design, I often come to the point where I have to pass object instances through several classes. For example, if I have a controller that loads an audio file, and then passes it to a player, and the player passes it to the playerRunnable, which passes it again somewhere else etc. It looks kind of bad, but I don´t know how to avoid it. Or is it OK to do this? EDIT: Maybe the player example is not the best because I could load the file later, but in other cases that does not work.

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• Basics of drawing in 2d with OpenGL 3 shaders

  - by davidism

  I am new to OpenGL 3 and graphics programming, and want to create some basic 2d graphics. I have the following scenario of how I might go about drawing a basic (but general) 2d rectangle. I'm not sure if this is the correct way to think about it, or, if it is, how to implement it. In my head, here's how I imagine doing it: t = make_rectangle(width, height) build general VBO, centered at 0, 0 optionally: t.set_scale(2) optionally: t.set_angle(30) t.draw_at(x, y) calculates some sort of scale/rotate/translate matrix (or matrices), passes the VBO and the matrix to a shader program Something happens to clip the world to the view visible on screen. I'm really unclear on how 4 and 5 will work. The main problem is that all the tutorials I find either: use fixed function pipeline, are for 3d, or are unclear how to do something this "simple". Can someone provide me with either a better way to think of / do this, or some concrete code detailing performing the transformations in a shader and constructing and passing the data required for this shader transformation?

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• Remote Desktop Viewer Set-up for 12.10

  - by Sir Linuxalot

  How do you set up the Remote Desktop in 12.10? I've scanned the available answers here and didn't find anything that answers the question considering the 12.10 interface. Specifically, advice says to check the "Allow Others to Control Your Desktop" and an IP will pop up (10.04 I believe). But when checking this in Quezal no IP shows. So how would I connect to my desktop from somewhere other than the local network, like say a coffee house? I also see this Remmina client program but have no idea if I need to use that as well. Can someone give me a step-by-step or point me to one that I haven't found yet? Thanks.

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• I'm porting my app from iOS to Android: what do I need to know?

  - by kubi

  What pitfalls should I avoid? What Java language paradigms do Objective-C developers consistently misunderstand? I learned to program in Java, but I have worked in nothing but Objective-C for years now. How are the design patterns different between Android and iOS? If you've made the transition yourself, what parts of Android confused you or took you longer to learn than it should have? Is Eclipse the best OS X IDE for Android? For the record, my app is very strongly tied to UIKit and Foundation, so the word "porting" may be a misnomer; I'll actually be completely rewriting it for Android. No code reuse. Also, I'm doing this to learn Android, so I'd rather fail at the port and learn Android than take a shortcut.

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• phpbb users table entries deletion and its effects. what are all the clean up work before deleting an user

  - by Jayapal Chandran

  I am writing a window program which will run from the system tray. which will ping my phpbb board site to fetch new users registration information. So with the result i can check whether the user is spam user or not. if i feel it is a spam user then i will delete that entry from the users table. before deleting the users table what are all the other table that i should delete. so that there will not be any unlinked references which will then in due course of time gets numerous and waste of disk space. so i want to know what i should do before deleting an user so that all his other activities should be cleaned off before i deleting a user.

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• Using Delegates in C# (Part 1)

  - by rajbk

  This post provides a very basic introduction of delegates in C#. Part 2 of this post can be read here. A delegate is a class that is derived from System.Delegate.  It contains a list of one or more methods called an invocation list. When a delegate instance is “invoked” with the arguments as defined in the signature of the delegate, each of the methods in the invocation list gets invoked with the arguments. The code below shows example with static and instance methods respectively: Static Methods 1: using System; 2: using System.Linq; 3: using System.Collections.Generic; 4: 5: public delegate void SayName(string name); 6: 7: public class Program 8: { 9: [STAThread] 10: static void Main(string[] args) 11: { 12: SayName englishDelegate = new SayName(SayNameInEnglish); 13: SayName frenchDelegate = new SayName(SayNameInFrench); 14: SayName combinedDelegate =(SayName)Delegate.Combine(englishDelegate, frenchDelegate); 15: 16: combinedDelegate.Invoke("Tom"); 17: Console.ReadLine(); 18: } 19: 20: static void SayNameInFrench(string name) { 21: Console.WriteLine("J'ai m'appelle " + name); 22: } 23: 24: static void SayNameInEnglish(string name) { 25: Console.WriteLine("My name is " + name); 26: } 27: } We have declared a delegate of type SayName with return type of void and taking an input parameter of name of type string. On line 12, we create a new instance of this delegate which refers to a static method - SayNameInEnglish.  SayNameInEnglish has the same return type and parameter list as the delegate declaration.  Once a delegate is instantiated, the instance will always refer to the same target. Delegates are immutable. On line 13, we create a new instance of the delegate but point to a different static method. As you may recall, a delegate instance encapsulates an invocation list. You create an invocation list by combining delegates using the Delegate.Combine method (there is an easier syntax as you will see later). When two non null delegate instances are combined, their invocation lists get combined to form a new invocation list. This is done in line 14.  On line 16, we invoke the delegate with the Invoke method and pass in the required string parameter. Since the delegate has an invocation list with two entries, each of the method in the invocation list is invoked. If an unhandled exception occurs during the invocation of one of these methods, the exception gets bubbled up to the line where the invocation was made (line 16). If a delegate is null and you try to invoke it, you will get a System.NullReferenceException. We see the following output when the method is run: My name is TomJ'ai m'apelle Tom Instance Methods The code below outputs the same results as before. The only difference here is we are creating delegates that point to a target object (an instance of Translator) and instance methods which have the same signature as the delegate type. The target object can never be null. We also use the short cut syntax += to combine the delegates instead of Delegate.Combine. 1: public delegate void SayName(string name); 2: 3: public class Program 4: { 5: [STAThread] 6: static void Main(string[] args) 7: { 8: Translator translator = new Translator(); 9: SayName combinedDelegate = new SayName(translator.SayNameInEnglish); 10: combinedDelegate += new SayName(translator.SayNameInFrench); 11:  12: combinedDelegate.Invoke("Tom"); 13: Console.ReadLine(); 14: } 15: } 16: 17: public class Translator { 18: public void SayNameInFrench(string name) { 19: Console.WriteLine("J'ai m'appelle " + name); 20: } 21: 22: public void SayNameInEnglish(string name) { 23: Console.WriteLine("My name is " + name); 24: } 25: } A delegate can be removed from a combination of delegates by using the –= operator. Removing a delegate from an empty list or removing a delegate that does not exist in a non empty list will not result in an exception. Delegates are invoked synchronously using the Invoke method. We can also invoke them asynchronously using the BeginInvoke and EndInvoke methods which are compiler generated.

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• What are my tool options to prototype a 2D online multiplayer game?

  - by Asher Einhorn

  I'm looking for the best tool to allow me to quickly put together a 2D game that relies largely on networking. It's extremely likely that this game will require a server side program to constantly run. I have little experience with these things and since it's a prototype i'd like the easiest options for achieving this. I am looking to make this game for the web and mobile devices, although at present I only have access to ios hardware, (no android etc). I just want to get the bare bones of this set up so I can test it from the earliest opportunity to see if it's fun. EDIT - doesn't unity have some inbuilt networking stuff in it?

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• Cannot execute binary file

  - by user291727

  I am new to Ubuntu and I'm trying to install Popcorn Time. I downloaded 32 bit version and tried to install it but that's where the problem started showing. I duble clicked the executable file and well, nothing happened. It's a official download from their web-site but it doesn't work. Maybe I'm doing something wrong.....Anyway, I found out that you can insatll it from a script, but people keep talking in ubuntu terms and I don't understand it, so I have a few questions: 1.How to make a script? (witch I'm suppose to run in terminal using bash comand), 2.Is it normal that i cannot run the installer, and if that is an installer or just files for the program. 3.If it is an installer, how do I make it work? 4.What does " Cannot execute binary file" mean? Thank you in advance, hope I'm not asking too many questions(please understand that I'm new to ubuntu) and sorry about my English. xD

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• how to recover deleted ntfs patition with data entirely while installing ubuntu 13.04

  - by Anson Varghese

  I've installed ubuntu 13.04 onto my hp 2231tx computer. During installation all of my data was erased. I didn't know all of my three partitions would be deleted. I was shocked after finding out that all of my personal data was erased. I didn't know what to do to resolve this problem so I search google for an answer. I found a program called testdisk and I used it to recover about half of my data. Among this data weren't my personal photos and videos. Is there a way to recover the other half?

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• Cannot run one of two OS

  - by Nathan

  first i am happy cuz i updated to ubuntu 12.10! yeah The grub had an error, but using this guide https://help.ubuntu.com/community/Boot-Repair i fixed it. yeah again I show you the page that gives me the program http://paste.ubuntu.com/1370085/ I have the system selection screen in violet, but i cannot run Windows XP. Only Ubuntu. When i press enter to start windows, the screen turns black and it returns automatically to the system selection screen. Is just that little problem, i need to use twos OS for job's reason. Thanks in advance and sorry for my little english!

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• Cant install wine1.5 13.04

  - by Drew S

  So I tried to install wine 1.5 a few times, I got 1.4 installed, and 1.6 installed oddly enough, I completely removed and purged all wine and still nothing. I installed ia32-lib and still nothing, tried installing from synaptic, ubuntu software center, and apt-get method. I get this error from apt-get in the terminal Reading package lists... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help resolve the situation: The following packages have unmet dependencies: wine1.5 : Depends: wine1.6 but it is not going to be installed E: Unable to correct problems, you have held broken packages. The particular windows program I want to install is confirmed working in 1.5(have it working on laptop)

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• Google Open-Sources Their Book Scanner

  - by Jason Fitzpatrick

  Google has released the hardware and software source for their high speed/non-destructive book scanner–If you’re looking to scan a large volume of books, save yourself the design work and check out the Linear Book Scanner project. The design is pretty slick; the scanner uses vacuum pressure to automatically turn the pages as it works. Check out the video above to see a Google Tech Talk about the project and then hit up the link below to grab the hardware and software files. Linear Book Scanner [via Hack A Day] Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It How To Delete, Move, or Rename Locked Files in Windows

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• How to prevent Ubuntu from changing screen brightness?

  - by cholazer

  I have recently installed 12.04 on ASUS-K53SV-V300. I can change the brightness on start-up with: echo 0 > /sys/class/backlight/acpi_video0/brightness >> /etc/rc.local or manually by Fn key. But, whenever Ubuntu dim my screen brightness to save power or wake-up from suspend or inactive for 20-30 seconds, brightness reset to high (my problem get much more when on battery). How can I disable screen brightness service to prevent it from changing my brightness? What service work on screen brightness? If I disable this service, can I manually set brightness by command? I found a program to work on brightness instead of default power manager.

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• Software developer needs Validation for VA Chap 31 to purchase Macbook Pro vs. PC [closed]

  - by David

  I am currently attending college with a path of software development and working towards my BS thanks to VA Chap 31. My old original Macbook Pro is near dead and no longer upgradable on the software or hardware side. The VA has offered to purchase a PC laptop for me (Because my syllabi says computer required), but I do not want to go backwards. I have a lot invested in OS X software and Mac peripherals, not to mention I prefer to program in an Apple environment. PC vs. Mac costs are so drastically different that I must validate my request for a new Macbook Pro. In my request to the VA, I stated the above and some other topics but they requested more validation. Can anyone recommend issues, reasons, etc. to help me validate this purchase by the VA for school? Thanks in advance for your help, David

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• Unity Launcher Does Not Remember Favorites

  - by mpace965

  I have already looked at the similar questions, but none of the solutions there worked for me. Basically, I can edit and remove icons just fine when I am in a session, but the next time I am logged in, they are reset to the default. Even more perplexing is this. If I start dconf-editor, and navigate to desktopunitylauncher, it shows the favorites that are supposed to be there, yet the default ones are still in the Launcher. I have already tried sudo apt-get purge unity and then sudo apt-get install unity from a GNOME session, but to no avail. Any suggestions? Edit: I also tried running gksudo dconf-editor to run the program with elevated privileges. Again I navigated to desktopunitylauncher. This time the default string was there, but when I tried to edit it, it would not change to what I typed.

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• How should I name the language data files?

  - by Ron

  Recently I decided to add some translations to my program. I wonder how I should name the language files? in the culture's name of the language (example: english = en, french = fr, italian = it, etc...) in the name of the language [in english] (example: english = english, french = french, italian = italian, etc..) I know you'll choose the second way because you dont have to detect which filename it is because both have the same name. But the problem is this - I show the name of the languages in its langauge (example: english = english, french = française, italian = italiano, etc..) so I still need to detect which filename it is. The main question is which way I should choose? the name of the language in english or the culture name? and why?... Thanks!

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• View/ViewModel Interaction - Bindings, Commands and Triggers

  It looks like I have a set of posts on ViewModel, aka MVVM, that have organically emerged into a series or story of sorts. Recently, I blogged about The Case for ViewModel, and another on View/ViewModel Association using Convention and Configuration, and a long while back now, I posted an Introduction to the ViewModel Pattern as I was myself picking up this pattern, which has since become the natural way for me to program client applications. This installment adds to this on-going series. I've...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• View/ViewModel Interaction - Bindings, Commands and Triggers

  It looks like I have a set of posts on ViewModel, aka MVVM, that have organically emerged into a series or story of sorts. Recently, I blogged about The Case for ViewModel, and another on View/ViewModel Association using Convention and Configuration, and a long while back now, I posted an Introduction to the ViewModel Pattern as I was myself picking up this pattern, which has since become the natural way for me to program client applications. This installment adds to this on-going series. I've...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• What would you do if your client required you not to use object-oriented programming?

  - by gunbuster363

  Would you try to persuade your client that using object-oriented programming is much cleaner? Or would you try to follow what he required and give him crappy code? Now I am writing a program to simulate the activity of ants in a grid. The ant can move around, pick up things and drop things. The problem is while the action of the ants and the positions of each ant can be tracked by class attributes easily (and we can easily create many instances of such ants) my client said that since he has a background in functional programming he would like the simulation to be made using functional programming. What would you do?

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• Is it normal to these Xcode prompts/errors when you deploy to IOS Simulator from Unity?

  - by Greg

  Just trying out the IOS build process.... Is it normal to see: Q1 - "upgrade to latest project format - project currently in Xcode 3.1 format, this will upgrade to 3.2" - just click OK and let Xcode do it's stuff? Q2 - same as Q1 but this time for the message "Remove obsolete build settings - will remove the build setting PREBINDING" Q3 - also when deploying to "Lastest IOS Simulator" you get the Simulator target produced, but also a non-simulator target which has lots of errors. So I assume you just ignore this target and not use it in Xcode correct? (i.e. just use the simulator target that is produced) Q4 - get a lot of warning after the simulator target is built? program works ok however.... Images For Q1 and Q2: For Q4: Settings used in Unity: Errors I see in XCode:

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• Windows Phone 7 For Silverlight Programmers

    This is the first in a series of mini-tutorials on Windows Phone 7 Programming for Silverlight Programmers. Goals: Rapid introduction to Win Phone 7 for experienced Silverlight Programmers Design and implementation of WP7 Silverlight HVP Audience: Silverlight Programmers who want to learn to program the new Windows Phone 7. Once the fundamentals are covered, the target [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• building a game for different resoulution phones

  - by Jason

  Hi, I am starting some tests for building a game on the android program. So far everything is working and seems nice. However I do not understand how to make sure my game looks correct on all phones as the all will have slightly different screen ratios (and even very different on some odd phones) What I am doing right now is making a view frustrum ( could also be ortho ) which I set to go from -ratio to +ratio ( as I have seen on many examples) however this causes my test shape to be stretched and sometimes cut off by the edge of the screen. I am tilting my phone to landscape to do my tests ( a bit extreame) but it should still render correctly if I have dome things right. Should I be scaling by some ratio before drawing or something? An example would be greatly apriciated PS I am doing a 2d game

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• How to Banish Duplicate Photos with VisiPic

  - by Jason Fitzpatrick

  You meant well, you intended to be a good file custodian, but somewhere along the way things got out of hand and you’ve got duplicate photos galore. Don’t be afraid to delete them and lose important photos, read on as we show you how to clean safely. Deleting duplicate files, especially important ones like personal photos, makes a lot of people quite anxious (and rightfully so). Nobody wants to be the one to realize that they deleted all the photos of their child’s first birthday party during a hard drive purge gone wrong. In this tutorial we’re going to show you how to go beyond the limited reach of  tools which simply compare file names and file sizes. Instead we’ll be using a program that combines that kind of comparison with actual image analysis to help you weed out not just perfect 1:1 file duplicates but also those piles of resized for email images, cropped images, and other modified images that might be cluttering up your hard drive. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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• OUYA and Unity set up problems

  - by Atkobeau

  I'm having trouble with the Unity / OUYA plugin. I'm using Unity 4 with the latest update on a Windows 7 machine. When I open the starter kit and try to compile the plugin I get the following error: Picked up _JAVA_OPTIONS: -Xmx512M And if I try to Build and Run I get this error: Error building Player: ArgumentException: Illegal characters in path. I'm stumped, I've gone through lots of forum posts here and on stackoverflow and I can't seem to resolve it. My environment variables look like this: PATH - C:\Users\dave\Documents\adt-bundle-windows-x86_64-20130219\sdk\tools; C:\Users\dave\Documents\adt-bundle-windows-x86_64-20130219\sdk\platform-tools\ JAVA_HOME - C:\Program Files (x86)\Java\jdk1.6.0_45\ Everything in the OUYA Panel is white Any ideas?

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• Repacked proprietary software keeps updating the same deb

  - by Johannes

  I repacked a proprietary program delivered as tar file to a deb file for having a company wide repository. I used reprepro to set up a repository and signed it. A unix timestamp is faking a versioning numbering, so I can have different (real) versions installed at the same time. Almost everything works as expected. The deb file looks like this: mysoft8.0v6_1366455181_amd64.deb Only problem on a client machine it tries to install the same deb file over and over again because it thinks its an update. What do I miss: control file in deb package looks like this: Package: mysoft8.0v6 Version: 1366455181 Section: base Priority: optional Architecture: amd64 Installed-Size: 1272572 Depends: Maintainer: me Description: mysoft 8.0v6 dpkg repackaging and the config in the repository: /mirror/mycompany.inc/conf/distributions: Origin: apt.mycompany.inc Label: apt repository Codename: precise Architectures: amd64 i386 Components: main Description: Mycompany debian/ubuntu package repo SignWith: yes Pull: precise Help much appreciated Added guide: This Is the guide I used to create the repository.

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