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• How do 2D physics engines solve the problem of resolving collisions along tiled walls/floors in non-grid-based worlds?

  - by ssb

  I've been working on implementing my SAT algorithm which has been coming along well, but I've found that I'm at a wall when it comes to its actual use. There are plenty of questions regarding this issue on this site, but most of them either have no clear, good answer or have a solution based on checking grid positions. To restate the problem that I and many others are having, if you have a tiled surface, like a wall or a floor, consisting of several smaller component rectangles, and you traverse along them with another rectangle with force being applied into that structure, there are cases where the object gets caught on a false collision on an edge that faces the inside of the shape. I have spent a lot of time thinking about how I could possibly solve this without having to resort to a grid-based system, and I realized that physics engines do this properly. What I want to know is how they do this. What do physics engines do beyond basic SAT that allows this kind of proper collision resolution in complex environments? I've been looking through the source code to Box2D trying to find out how they do it but it's not quite as easy as looking at a Collision() method. I think I'm not good enough at physics to know what they're doing mathematically and not good enough at programming to know what they're doing programmatically. This is what I aim to fix.

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• XSLT and possible alternatives [on hold]

  - by wirrbel

  I had a look at XSLT for transforming one XML file into another one (HTML, etc.). Now while I see that there are benefits to XSLT (being a standardized and used tool) I am reluctant for a couple of reasons XSLT processors seem to be quite huge / resource hungry XML is a bad notation for programming and thats what XSLT is all about. It do not want to troll XSLT here though I just want to point out what I dislike about it to give you an idea of what I would expect from an alternative. Having some Lisp background I wonder whether there are better ways for tree-structure transformations based upon some lisp. I have seen references to DSSSL, sadly most links about DSSSL are dead so its already challenging to see some code that illustrates it. Is DSSSL still in use? I remember that I had installed openjade once when checking out docbook stuff. Jeff Atwood's blog post seems to hint upon using Ruby instead of XSLT. Are there any sane ways to do XML transformations similar to XSLT in a non-xml programming language? I would be open for input on Useful libraries for scripting languages that facilitate XML transformations especially (but not exclusively) lisp-like transformation languages, or Ruby, etc. A few things I found so far: A couple of places on the web have pointed out Linq as a possible alternative. Quite generally I any kind of classifications, also from those who have had the best XSLT experience. For scheme http://cs.brown.edu/~sk/Publications/Papers/Published/kk-sxslt/ and http://www.okmij.org/ftp/Scheme/xml.html

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• failbit is being set and I can't figure out why

  - by felipedrl

  I'm writing a MIDI file loader. Everything is going fine until at some track I get a failbit exception while trying to read from file. I can't figure out why, I've checked the file size and it's ok too. Upon checking "errno" and it returns "0". Any ideas? Thanks. The snippet follows: file.read(reinterpret_cast<char*>(&mHeader.id), sizeof(MidiHeader)); mTracks = new MidiTrack[mHeader.nTracks]; for (uint i = 0; i < mHeader.nTracks; ++i) { // this read fails on 6th i. I've checked hexadecimal file and it's // ok so far. file.read(reinterpret_cast<char*>(&mTracks[i].id), sizeof(uint)); if (file.fail()) { std::cerr << errno << std::endl; massert(false); } massert(mTracks[i].id == 0x6B72544D); file.read(reinterpret_cast<char*>(&mTracks[i].size), sizeof(uint)); mTracks[i].size = swapBytes(mTracks[i].size); mTracks[i].data = new char[mTracks[i].size]; file.read(mTracks[i].data, mTracks[i].size * sizeof(char)); totalBytesRead += 8 + mTracks[i].size; massert(totalBytesRead <= fileSize); }

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• Run script at user login as root, with a catch

  - by tubaguy50035

  I'm trying to run a PHP script as root on user login. The PHP script adds a Samba share to the Samba config, thus the need for root privileges. The only issue here, is that the user doesn't exist yet. This system is integrated with active directory. So when a user logs in for the first time, a home directory for them is created under /home/DOMAIN/username. I've found this question and that seems like the correct way to get what I want, but I'm having trouble with the syntax since I don't know the user's name. Would it be something like: ALL ALL=(ALL) NOPASSWD: /home/DOMAIN/*/createSambaShare.php This doesn't seem to work as it is currently. Anyone have any ideas or a "scripted" way to add a Samba share on user login? Since I've made other changes to /etc/skel, I just added the bash necessary to run the PHP script in .profile in there. This then gets copied to the "new" user's home and it tries to run the PHP script. But it fails, because these are not privileged users. Changing permissions on the PHP script will not help. It needs to be run as sudo because it opens the Samba config file for writing. Letting any user run the PHP script would result in a PHP error. The homes Samba directive doesn't work for my use case. I need the Samba share to exist once they exist on the server, even when they're not logged in.

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• Weird UIView transforms in Retina iPhone

  - by ggambett

  I'm having a problem I don't understand. I'm developing an OpenGL app for iOS. Because at some points I want to force the orientation of the view programatically, and Apple for whatever reason doesn't make it easy (or even possible), I'm doing it by hand. I return always NO in shouldAutoRotateToInterfaceOrientation, and when I want to change the orientation (to portrait, for example), I do something like this in the UIView: [self setTransform:CGAffineTransformMake(1, 0, 0, 1, 0, 0)]; [self setBounds:CGRectMake(0, 0, 768, 1024)]; This works fine. In order to support Retina devices, I started checking [UIScreen mainScreen].scale, and setting self.contentScaleFactor accordingly. I also modified the code above to account for the new dimensions, like this: [self setTransform:CGAffineTransformMake(1, 0, 0, 1, 0, 0)]; [self setBounds:CGRectMake(0, 0, 2*768, 2*1024)]; Same rotation, different size. The weird result with this is that I get a "screen" with the right size, but offsetted half a screen to the bottom and the left. To correct for this, I need to do the following: [self setTransform:CGAffineTransformMake(1, 0, 0, 1, 0, 0)]; [self setBounds:CGRectMake(-768, -1024, 2*768 - 768, 2*1024 - 1024)]; This works, but it's ugly, I also need to make similar corrections when I get touch coordinates, and worst of all, I don't understand what's going on or why the above "correction" works. Can anyone shed some light on this issue?

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• No Thank You &ndash; Yours Truly &ndash; F#

  - by MarkPearl

  I am plodding along with my F# book. I have reached the part where I know enough about the syntax of the language to understand something if I read it – but not enough about the language to be productive and write something useful. A bit of a frustrating place to be. Needless to say when you are in this state of mind – you end up paging mindlessly through chapters of my F# book with no real incentive to learn anything until you hit “Exceptions”. Raising an exception explicitly So lets look at raising an exception explicitly – in C# we would throw the exception, F# is a lot more polite instead of throwing the exception it raises it, … (raise (System.InvalidOperationException("no thank you"))) quite simple… Catching an Exception So I would expect to be able to catch an exception as well – lets look at some C# code first… try { Console.WriteLine("Raise Exception"); throw new InvalidOperationException("no thank you"); } catch { Console.WriteLine("Catch Exception and Carry on.."); } Console.WriteLine("Carry on..."); Console.ReadLine();   The F# equivalent would go as follows… open System; try Console.WriteLine("Raise Exception") raise (System.InvalidOperationException("no thank you")) with | _ -> Console.WriteLine("Catch Exception and Carry on..") Console.WriteLine("Carry on...") Console.ReadLine();   In F# there is a “try, with” and a “try finally” Finally… In F# there is a finally block however the “with” and “finally” can’t be combined. open System; try Console.WriteLine("Raise Exception") raise (System.InvalidOperationException("no thank you")) finally Console.WriteLine("Finally carry on...") Console.ReadLine()

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• What credentials should I use to access a Windows share?

  - by JMCF125

  H
  i, I have installed Samba and CIFS and all that, followed a bunch of tutorials, but still I can't access a share in the separate Windows 7 machine. Before I could access a share in Ubuntu from Windows, but although now I can't for whatever reason; the error of the attempt to mount the Windows share is the same: 13, asking for credentials (the computer with Windows is off now, but I can add the exact error message later). In /etc/fstab I have: # ... (help info) ... # <file system> <mount point> <type> <options> <dump> <pass> # ... (mounting points that don't matter for the question) ... //192.168.1.2/C\:/Users/Public/Documents /srv/Z\:/ cifs user=guest,password=,uid=1000,iocharset=utf8 0 0 I also tried options such as username=guest,uid=1000,iocharset=utf8 and guest,uid=1000,iocharset=utf8, which, of course, don't work. What user am I supposed to use? (user=user; username=user; my credentials in the Windows and Ubuntu machines do not work, at least with the syntax I tried - similar to this). Even if this worked it's not actually what I want. I wanted to setup an authentication for any one trying to access the drive (it's currently 777, for the Linux share as well) and put a limit/quota on the share's use (as I see Z:on Windows, it allows for the entire C:drive to be filled). Thank you in advance. I'd be glad if you suggested a way to do this even without the last paragraph.

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• Enabling GTX 570

  - by Silas

  Hello i just built up my new system: Asus Rock Z77 Extreme 4 Intel i7 3770k 16 Gb Corsair Ram Zotac Nvidia GTX 570 bequiet! 630W Power supply 120 GB SSD So after i installed UBUNTU 12.04 64 bit. It ran smoothly. I downloaded and installed all the recommended updates. After checking the Sytem details the GTX 570 didnt show up as graphics unit. so i figured i needed to download the drivers. So i did but being a complete newbie to linux i didnt succeed in installing them. (I think) Anyway after several tries and errors i shut down the PC and restarted it. Resultung in do Signal to my screen after trying to reboot and all the monitor outs with no result i took out the graphic card and now it boots normally but after booting it says there is a problem with the system the graphics cant be recognized something something. So Question A: What do i do? I Like linux but the arbitrarity of the Errors that occur without any changes to the system scare me. Question B: Is there A beginners guide to Ubuntu where i could start from scratch because i really want this to work? Question C: Now that the System is (suddently) showing these graphic errors So far without visible consequence despite the error message. should i reinstall the GPU and give the driver installation another try or the other way around? Ill be very grateful for any help. Thank you in advance!

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• Should I learn the easier framework as a start? [closed]

  - by gunbuster363

  I've been a programmer for 2 years. I learned Java SE, C from college and learned Cobol from the workplace. I've noticed that there is a hype about framework and I actually don't know what is a framework. It is so cool that my colleague once said you cannot find a new job without knowing something like struct spring hibernate. And we should know Java EE too because it was aimed for enterprise application. I've never code something such as server-client web application, and I think I need to try it out. But which language should I code in? I can't decide between the following 2: 1) Java. It is heavily used by many company so I could easily reuse the experience gained. But Java and its related framework are pretty heavy (for the machine and operation). It is on-demand. 2) ROR. It is cool. The syntax of ruby is simple. I can get a better hand on it. And maybe I can learn the concept easily and possibly correctly. However, not much company here would use it. All the job ads are about J2EE/C#. Should I learn the easy one or the difficult one? Not to mention there are a lot of frameworks out there for Java, which makes the decision much more difficult.

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• Two components offering the same functionality, required by different dependencies

  - by kander

  I'm building an application in PHP, using Zend Framework 1 and Doctrine2 as the ORM layer. All is going well. Now, I happened to notice that both ZF1 and Doctrine2 come with, and rely on, their own caching implementation. I've evaluated both, and while each has its own pro's and cons, neither of them stand out as superior to the other for my simple needs. Both libraries also seem to be written against their respective interfaces, not their implementations. Reasons why I feel this is an issue is that during the bootstrapping of my application, I have to configure two caching drivers - each with its own syntax. A mismatch is easily created this way, and it feels inefficient to set up two connections to the caching backend because of this. I'm trying to determine what the best way forward is, and would welcome any insights you may be able to offer. What I've thought up so far are four options: Do nothing, accept that two classes offering caching functionality are present. Create a Facade class to stick Zend's interface onto Doctrine's caching implementation. Option 2, the other way around - create a Facade to map Doctrine's interface on a Zend Framework backend. Use multiple-interface-inheritance to create one interface to rule them all, and pray that there aren't any overlaps (ie: if both have a "save" method, they'll need to accept params in the same order due to PHP's lack of proper polymorphism). What option is best, or is there a "None of the above" variant that I'm not aware of?

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• SDL_DisplayFormat works, but not SDL_DisplayFormatAlpha

  - by Bounderby

  The following code is intended to display a green square on a black background. It executes, but the green square does not show up. However, if I change SDL_DisplayFormatAlpha to SDL_DisplayFormat the square is rendered correctly. So what don't I understand? It seems to me that I am creating *surface with an alpha mask and I am using SDL_MapRGBA to map my green color, so it would be consistent to use SDL_DisplayFormatAlpha as well. (I removed error-checking for clarity, but none of the SDL API calls fail in this example.) #include <SDL.h> int main(int argc, const char *argv[]) { SDL_Init( SDL_INIT_EVERYTHING ); SDL_Surface *screen = SDL_SetVideoMode( 640, 480, 32, SDL_HWSURFACE | SDL_DOUBLEBUF ); SDL_Surface *temp = SDL_CreateRGBSurface( SDL_HWSURFACE, 100, 100, 32, 0, 0, 0, ( SDL_BYTEORDER == SDL_BIG_ENDIAN ? 0x000000ff : 0xff000000 ) ); SDL_Surface *surface = SDL_DisplayFormatAlpha( temp ); SDL_FreeSurface( temp ); SDL_FillRect( surface, &surface->clip_rect, SDL_MapRGBA( screen->format, 0x00, 0xff, 0x00, 0xff ) ); SDL_Rect r; r.x = 50; r.y = 50; SDL_BlitSurface( surface, NULL, screen, &r ); SDL_Flip( screen ); SDL_Delay( 1000 ); SDL_Quit(); return 0; }

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• Web hosting company basically forces me to use their domain name [closed]

  - by Jinx

  I've recently stumbled upon an unusual problem with one of hosting companies called giga-international.com. Anyway, I've ordered com.hr domain from Croatian domain name registration company, and my client insisted on using this host provider as couple of his friends already are hosted with them. I thought something was fishy when the first result on Google for Giga International was this little forum rant instead of their webpage. When I was checking their services they listed many features etc... space available, bandwidth etc. I just wanted to check how much ram do I get for my PHP scripts so I emailed them, and they told me that was company secret. Seriously? Anyway, since my client still insisted on hosting with them I've bought their Webspace package. During registration I had to choose free domain name because I couldn't advance registration without it. Nowhere was said, not even in general terms and conditions that I wouldn't be able to change that domain name. At least not for double the price of domain name per year. They said I can either move my domain name over to them (and pay them domain registration), or pay them 1 Euro per month for managing a DNS entry. On any previous hosting solution I was able to manage my domain names just by pointing my domain to their name servers, and this is something completely new and absurd for me. They also said that usual approach is not possible because of security and hardware limitations. I'd like to know what you guys think about this case, and should I report, and where should I report this case. In short. They forced me to register free domain name which doesn't suit my needs in order to register for their webspace package, and refuse to change domain name for my account until I either transfer domain to them or pay them DNS management which costs double the price of the domain name per year.

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• Pair Programming, for or against? [on hold]

  - by user1037729

  I believe it has many advantages over individual programming: Pros By pairing senior with relatively junior staff, the more junior can get up to speed with both project and computing experience, and the senior will re-think the problem in order to communicate with the junior, thus re-checking his own thinking (rubber duck principle!). At least 2 people will know about any single piece of work, if one person is away the other can cover, or if some one leaves a project knowledge transfer is easier. Two brains on a complex task is more effective, communication keeps the work free flowing and provides redundancy in decision making. Code is effectively reviewed as its being written, no need for a separate reviewing phase which requires a context switch as someone who has not been working on the piece in question would be required to understand and review the related code. Reviewing code on your own which you haven't written or architected is not fun, hence counter productive. Cons Less bandwith for performing tasks, lets say we have 4 devs, pair programming requires 2 devs per task, so we would be doing 2 tasks concurrently as a posed to 4. I believe this "Con" does not stand up as the pair programmed task would complete sooner and comes with a review built in for free! Ie the pair programming task would be more efficient and thus free up resources earlier. Less flexibility to chop and change tasks as two developers are tied into a task, when flexibility is required this could be a problem.

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• How to Edit aspx, Cshtml and other kind of files live on FTP server ?

  - by Anirudha

  Originally posted on: http://geekswithblogs.net/anirugu/archive/2013/06/27/how-to-edit-aspx-cshtml-and-other-kind-of-files.aspxMany time we just want to make a small changes on site and we don’t want to download the whole project again. In this post I will show you some good way to do it.   People who have Expression Web 4 can do it. I tried it and it’s work good with aspx file. If you have site in asp.net and use aspx engine then this is a good option. Well, Expression Web is free (previously paid software). A another good option is Komodo Edit. You can use komodo edit and few plugin to make FTP editing work for you. The problem in these 2 apps are they don’t have syntax highlight and support for CSHTML file which are introduced with MVC 3. For this I suggest you to go with webmatrix. You can use Webmatrix to edit cshtml file online. Remember that Webmatrix don’t support Compiling of MVC project. You need Visual Web developer Express at-least to compile your project. if you are in hurry try  https://c9.io/ put your FTP settings and you just got your hands ready to make changes on live site. If you have anything else in your mind share it here.

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• 'Buy the app' landing page implementations

  - by benwad

  My site (using Django) has an app that I'm trying to push - I currently have a piece of middleware that redirects the user to a page advertising the app if they're accessing the page on the iPhone, then setting a cookie so that the user isn't bugged by the message every time they visit the site. This works fine, however checking the page with the mobile Googlebot checker shows that the Googlebot gets stuck in the redirect (since it doesn't store cookies) and therefore won't index the proper content. So, I'm trying to think of an alternative implementation that won't hurt the site's Google ranking and won't have any other adverse effects. I've considered a couple of options: Redirect (the current solution), but don't redirect if the user agent matches the Googlebot's UA string. This would be ideal, however I'm not sure if Google like their bot being treated differently from other users, and I'm afraid the site's ranking may be somehow penalised if I go ahead with this. Use a Javascript popup instead of a redirect. This would make sure the Googlebot finds the content it needs, however I envision this approach causing compatibility issues with the myriad mobile devices/browsers out there, and may affect the page load time. How valid are these options? And is there a better option for implementing this feature out there? I've tried researching this topic but surprisingly can't find any reputable-looking blog posts that explore this topic. EDIT: I posted this on SF because it seemed unsuitable for SO, but if there's another site that would be better for this issue then I'd be happy to move the question elsewhere.

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• Incomplete Ubuntu 12.04 install dual-boot XP

  - by Mike

  This weekend has been the 1st time I've tried to install Ubuntu. On the initial install, (I am using a USB) the installation went all the way through and asked to restart when completed. I was not able to get grub to boot and kept going through Windows. After some research I found some articles on updating/reinstalling grub, so I followed those. I finally got grub to load after a day but there was no Windows option only the Ubuntu 12.04 which when I selected it only gave me a fatal error 17. I booted from the USB again and deleted the partitions and installed again. This time I got an error 15. I then booted through XP and downloaded the WUBI.exe and uninstalled Ubuntu and reinstalled again. The installation went to the very end and then gave an error message (which I don't remember exactly what it said) something along the lines of checking my logs on my C drive. I then uninstalled Ubuntu and removed the wubi.exe file and wiped my USB and did the download to the USB again. Booted through USB and ran the install process again. It again went through the install process but after creating username and password and hitting continue, the installation dialogue box disappears and the mouse spinning wheel is displayed, but I do not receive the prompt to restart. I can still access the side menu for Ubuntu but the wheel keeps spinning. How do I get Ubuntu to install properly?

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• ISO 12207 - testing being only validation activity? [closed]

  - by user970696

  Possible Duplicate: How come verification does not include actual testing? ISO norm 12207 states that testing is only validation activity, while all static inspections are verification (that requirement, code.. is complete, correct..). I did found some articles saying its not correct but you know, it is not "official". I would like to understand because there are two different concepts (in books & articles): 1) Verification is all testing except for UAT (because only user can really validate the use). E.g. here OR 2) Verification is everything but testing. All testing is validation. E.g. here Definitions are mostly the same, as Sommerville's: The aim of verification is to check that the software meets its stated functional and non-functional requirements. Validation, however, is a more general process. The aim of validation is to ensure that the software meets the customer’s expectations. It goes beyond simply checking conformance with the specification to demonstrating that the software does what the customer expects it to do It is really bugging me because I tend to agree that functional testing done on a product (SIT) is still verification because I just follow the requirements. But ISO does not agree..

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• DB Object passing between classes singleton, static or other?

  - by Stephen

  So I'm designing a reporting system at work it's my first project written OOP and I'm stuck on the design choice for the DB class. Obviously I only want to create one instance of the DB class per-session/user and then pass it to each of the classes that need it. What I don't know it what's best practice for implementing this. Currently I have code like the following:- class db { private $user = 'USER'; private $pass = 'PASS'; private $tables = array( 'user','report', 'etc...'); function __construct(){ //SET UP CONNECTION AND TABLES } }; class report{ function __construct ($params = array(), $db, $user) { //Error checking/handling trimed //$db is the database object we created $this->db = $db; //$this->user is the user object for the logged in user $this->user = $user; $this->reportCreate(); } public function setPermission($permissionId = 1) { //Note the $this->db is this the best practise solution? $this->db->permission->find($permissionId) //Note the $this->user is this the best practise solution? $this->user->checkPermission(1) $data=array(); $this->db->reportpermission->insert($data) } };//end report I've been reading about using static classes and have just come across Singletons (though these appear to be passé already?) so what's current best practice for doing this?

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• Is constantly looking for code examples a sign of a bad developer?

  - by Newly Insecure

  I am a CS student with several years of experience in C and C++, and for the last few years I've been constantly working with Java/Objective C doing app development and now I have switched to web development and am mainly focused on ruby on rails and I came to the realization that (as with app development , really) I reference other code way too much. I constantly Google functionality for lots of things I imagine I should be able to do from scratch and it's really cracked my confidence a bit. Basic fundamentals are not an issue, I hate to use this as an example but I can run through javabat in both java/python at a sprint - obviously not an accomplishment and but what I mean to say is I have a strong base for the fundamentals I think? I know what I need to use typically but reference syntax constantly. Would love some advice and input on this, as it has been holding me back pretty solidly in terms of looking for work in this field even though I'm finishing my degree. My main reason for asking is not really about employment, but more that I don't want to be the only guy at a hackathon not hammering out nonstop code and sitting there with 20 Google/github tabs open, and I have refrained from attending any due to a slight lack of confidence... Is a person a bad developer by constantly looking to code examples for moderate to complex tasks?

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• Are Java's public fields just a tragic historical design flaw at this point?

  - by Avi Flax

  It seems to be Java orthodoxy at this point that one should basically never use public fields for object state. (I don't necessarily agree, but that's not relevant to my question.) Given that, would it be right to say that from where we are today, it's clear that Java's public fields were a mistake/flaw of the language design? Or is there a rational argument that they're a useful and important part of the language, even today? Thanks! Update: I know about the more elegant approaches, such as in C#, Python, Groovy, etc. I'm not directly looking for those examples. I'm really just wondering if there's still someone deep in a bunker, muttering about how wonderful public fields really are, and how the masses are all just sheep, etc. Update 2: Clearly static final public fields are the standard way to create public constants. I was referring more to using public fields for object state (even immutable state). I'm thinking that it does seem like a design flaw that one should use public fields for constants, but not for state… a language's rules should be enforced naturally, by syntax, not by guidelines.

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• Emulate Historical Figures i.e. Einstein - Is this possible using linguistic logic for my http://www.ustimeline.com Education System

  - by Johnnylight

  After hearing about the success of IBM's Watson I started thinking perhaps emulating human language is now possible? My goal is to create Virtual Historical characters to represent the main characters in my Adventur-Cation The Great American Adventure program such as Einstein or Crazy Horse. The goal is to build an intelligent system capable of indexing the internet and storing the data using a schema using modern knowledge on linguistic theory (phonemes, morphemes, syntax) to build a system capable to returning a semantically sound response very similar to the response made by the same person if still alive today. The goal would be to use the same engine/system for all characters. Each characters would have their own digital representation and voice, and would organize data differently based on tags/keywords stored about the individual. Imagine a Max Headroom Einstein. Based on the success of Watson, I believe something like this may now be possible. Would be an interesting way to study history and would be a vehicle of entertainment as well. Can anyone confirm if this has already been attempted? Is anyone interested in exploring this using Cognitive Science, Psychology, Artificial Intelligence, Historical data captured on the internet, and Linguistic theory?

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• is wisdom of what happens 'behind scenes' (in compiler, external DLLs etc.) important?

  - by I_Question_Things_Deeply

  I have been a computer-fanatic for almost a decade now. I've always loved and wondered how computers work, even from the purest, lowest hardware level to the very smallest pixel on the screen, and all the software around that. That seems to be my problem though ... as I try to write code (I'm pretty fluent at C++) I always sit there enormous amounts of time in front of a text-editor wondering how every line, statement, datum, function, etc. will correspond to every Assembly and machine instruction performed to do absolutely everything necessary for the kernel to allocate memory to run my compiled program, and all of the other hardware being used as well. For example ... I would write cout << "Before memory changed" << endl; and run the debugger to get the Assembly for this, and then try and reverse disassemble the Assembly to machine code based on my ISA, and then research every .dll, library file, linked library, linking process, linker source code of the program, the make file, the kernel I'm using's steps of processing this compilation, the hardware's part aside from the processor (e.g. video card, sound card, chipset, cache latency, byte-sized registers, calling convention use, DDR3 RAM and disk drive, filesystem functioning and so many other things). Am I going about programming wrong? I mean I feel I should know everything that goes on underneath English syntax on a computer program. But the problem is that the more I research every little thing the less I actually accomplish at all. I can never finish anything because of this mentality, yet I feel compelled to know everything... what should I do?

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• Unable to make sound play in headset

  - by user50849

  Top right, I click the sound icon, select sound settings, and connect my USB-headset. I can them see the headset being detected as it pops up in the menu. I click it, and expect the currently played audio to get sent to the headset instead. My problem is that it does not. The audio keeps playing through the built-in speakers. More info: The icon for my built-in card in the sound settings is a circuit with a note symbol on top. The symbol for the headset is just black background with a "No" symbol on it. Might mean it doesn't work somehow. I installed pavucontrol, and notice that no second sound card shows up in there. When connecting, the syslog says Jun 20 09:38:46 yuna kernel: [40144.553431] usb 2-1.2: new full-speed USB device number 11 using ehci_hcd Jun 20 09:38:46 yuna kernel: [40144.650609] input: C-Media USB Headphone Set as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.3/input/input20 Jun 20 09:38:46 yuna kernel: [40144.650895] generic-usb 0003:0D8C:000C.000B: input,hidraw0: USB HID v1.00 Device [C-Media USB Headphone Set ] on usb-0000:00:1d.0-1.2/input3 Jun 20 09:38:46 yuna mtp-probe: checking bus 2, device 11: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2" Jun 20 09:38:46 yuna mtp-probe: bus: 2, device: 11 was not an MTP device

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• Anyone can suggest some Game Frameworks for GNU/Linux? [closed]

  - by dysoco

  So I've been developing a little bit with XNA + C# in Windows, not really much: just some 2D stuff, but I've found that XNA is a really good framework. I'm a GNU/Linux user, and I'm definitely migrating my desktop to Gentoo Linux (I've been using Arch in my laptop for a while now). But, of course, I need a C# + XNA alternative... I'm not really an expert in any language, so I can really pick up anything (except, maybe, Functional ones), I prefer C-Like languages like Java or Ruby, I tried Python but found the Whitespace syntax confusing. I would like to hear some of you'r suggestions, I'm not asking for "the best", but for "some suggestions", so I think this is objective enough. Probably you're going to suggest C++ + SDL, but I would prefer something more "High Level" like XNA, but I'm open to discuss anything. So... any ideas ? Note: I think this questions meets the guidelines for this site, if it doesn't: please not only downvote this question, but comment on what can I do to improve it. Thanks. PS: 2D Games, not 3D

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• Throwing and catching exceptions in the same function/method

  - by usr

  I've written a function that asks a user for input until user enters a positive integer (a natural number). Somebody said I shouldn't throw and catch exceptions in my function and should let the caller of my function handle them. I wonder what other developers think about this. I'm also probably misusing exceptions in the function. Here's the code in Java: private static int sideInput() { int side = 0; String input; Scanner scanner = new Scanner(System.in); do { System.out.print("Side length: "); input = scanner.nextLine(); try { side = Integer.parseInt(input); if (side <= 0) { // probably a misuse of exceptions throw new NumberFormatException(); } } catch (NumberFormatException numFormExc) { System.out.println("Invalid input. Enter a natural number."); } } while (side <= 0); return side; } I'm interested in two things: Should I let the caller worry about exceptions? The point of the function is that it nags the user until the user enters a natural number. Is the point of the function bad? I'm not talking about UI (user not being able to get out of the loop without proper input), but about looped input with exceptions handled. Would you say the throw statement (in this case) is a misuse of exceptions? I could easily create a flag for checking validity of the number and output the warning message based on that flag. But that would add more lines to the code and I think it's perfectly readable as it is. The thing is I often write a separate input function. If user has to input a number multiple times, I create a separate function for input that handles all formatting exceptions and limitations.

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