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• apt-get install kernel source error

  - by MA1

  apt-get source linux-image-$(uname -r) gives me the below error Reading package lists... Done Building dependency tree Reading state information... Done Picking 'linux' as source package instead of 'linux-image-3.0.0-12-generic' NOTICE: 'linux' packaging is maintained in the 'Git' version control system at: http://kernel.ubuntu.com/git-repos/ubuntu/ubuntu-oneiric.git Skipping already downloaded file 'linux_3.0.0-17.30.dsc' Need to get 99.9 MB of source archives. Err http://pk.archive.ubuntu.com/ubuntu/ oneiric-updates/main linux 3.0.0-17.30 (tar) 500 ( The request was rejected by the HTTP filter. Contact your ISA Server administrator. ) Err http://pk.archive.ubuntu.com/ubuntu/ oneiric-updates/main linux 3.0.0-17.30 (diff) 500 ( The request was rejected by the HTTP filter. Contact your ISA Server administrator. ) Failed to fetch http://pk.archive.ubuntu.com/ubuntu/pool/main/l/linux/linux_3.0.0.orig.tar.gz 500 ( The request was rejected by the HTTP filter. Contact your ISA Server administratorThe request was rejected by the HTTP filter. Contact your ISA Server administrator. ) Failed to fetch http://pk.archive.ubuntu.com/ubuntu/pool/main/l/linux/linux_3.0.0-17.30.diff.gz 500 ( The request was rejected by the HTTP filter. Contact your ISA Server administrator. ) E: Failed to fetch some archives. Can someone suggest a solution?

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• Advice: The first-time interviewer's dilemna

  - by shan23

  I've been working in my first job for about 2 years now, and I've been "asked" to interview a potential teammate (whom I might have to mentor as well) on pretty short notice (2 days from now). Initially, I had been given a free rein(or so I thought, and hence agreed), but today, I've been told "not to pose bookish questions" - implying I can only ask basic programming puzzles and stuff similar to the 'fizbuzz' question. I strongly believe that not knowing basic algorithmic notations(the haziest ideas of space/time complexities) or the tiniest idea of regular expressions would make working with the guy very difficult for anyone. I know i'm asking for a lot here, but according to you, what would be a comprehensive way to test out the absolutely basic requirements of a CS guy(he has 2 yrs of exp) without sounding too pedantic/bookish etc ? It seems it would be legit to ask C questions/simple puzzles only....but I really do want to have something a bit different from "finding loops in linked lists" that has kind of become the opening statement of most techie interviews !! This is a face-to-face interview with about an hour or more of time - I looked at Steve's basic phone-screen questions, and I was wondering if there exists a guide on "basic face-to-face interview questions" that I can use(or compile from the community's answers here). EDIT: The position is mostly for a kernel level C programming job, with some smattering of C++ required for writing the test framework.

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• How to keep word document, html and pdf documentation aligned

  - by dendini

  Is there a way to write documentation in a WYSIWYG editor which can then export into HTML, WORD and PDF and keep copies synchronized? This documentation are mostly technical notes and some contextual help for some softwares so they must contain images and some styling, they are not programmer's documentation (API list or functions list) for which probably a program like Javadoc or Doxygen would be the best choice. For example how do companies with hundreds different software lines and thousands of programmers deal with this? I have several solutions but they all seem lacking in some aspect: Latex/Tex : very good pdf and html export, not very user friendly and no full-blown WYSIWYG editor available. LibreOffice/OpenOffice : full blown WYSIWYG editor however html export not so good (need to edit manually exported html which needs to be maintained separately ) Mediawiki or any other wiki : could be keeping documentation in wikitext format, so html is automatically generated, pdf exportation is quite good with many available plugins. Again however need some formation for the staff to use it and need to setup a server for this. Notice I'm not asking for software A vs software B, I'm asking for general advice, big companies procedures for documentation and yes some software product names if available.

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• How do I create a 2.5d parallax effect?

  - by Nikolay Dyankov

  I have a decent background in 3D graphics and programming, but I'm new to game development. I'm currently exploring different possibilities and I really want to make an RPG game. I was thinking about classic 2D isometric view, but I really love how Diablo 2 looks and feels to play. My question is - how can I achieve Diablo 2's parallax effect? Everything looks hand drawn with baked lights and shadows and looks awesome, but when you move around you notice some perspective. For example, let's say that I drew a big hall with columns in Photoshop with an orthographic perspective (classic pixel art style, just parallel lines). How would I give parallax effect to this scene when the character moves around? If I use camera-facing sprites for everything it would probably look OK in the distance, but it would be really fake when a character comes close to a column (cylinder) for example. Any suggestions? How did Blizzard make the parallax effect in Diablo 2? See this screenshot: http://guidesmedia.ign.com/guides/10629/images/act2tombs.jpg

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• 5 Design Tricks Facebook Uses To Affect Your Privacy Decisions

  - by Jason Fitzpatrick

  If you feel like Facebook increasingly has fewer and fewer options to reject applications and organization access to your private information, you’re not imagining it. Here are five ways Facebook’s design choices in the App Center have minimized your choices over time. Over at TechCrunch they have a guest post by Avi Charkham highlighting five ways recent changes to the Facebook App Center put privacy settings on the back burner. In regard to the comparison seen in the image above, for example, he writes: #1: The Single Button Trick In the old design Facebook used two buttons – “Allow” and “Don’t Allow” – which automatically led you to make a decision. In the new App Center Facebook chose to use a single button. No confirmation, no decisions to make. One click and, boom, your done! Your information was passed on to the app developers and you never even notice it. Hit up the link below to check out the other four redesign choices that minimize the information about privacy and data usage you see and maximize the click-through and acceptance rate for apps. How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU HTG Explains: Is UPnP a Security Risk?

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• Job title inflation and fluffing

  - by Amir Rezaei

  When you work on the same project for a relative long time you get more experienced. You may also master many new technologies. Besides the coding you may also do what would classify other roles. There is however one part of your career that may not get updated. That is your job title. It seems beside all technological hypes there is also job title hype. It all depends on which company you work for. Many companies give employer better job titles because they want to keep them. The employee doesn’t change their job because the current title is much better, even if they would get better working condition and benefits if they changed their job. When you consider changing you job you notice that your job title is kind of “outdated”. People with less skill have a much better title for their job than you. You may very well explain what you did on your project but the fact is that many employers go by the title. So here are the questions: Do you change your current title in your CV? What are other options? Here are some good readings regarding these phenomena: Job title inflation Job title fluffing

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• Lenovo ThinkPad L520 slows down when AC power adapter is plugged in

  - by Aamir

  I have a new laptop Lenovo ThinkPad L520 (7859-5BG) Core i5-2520M(2.5GHz) with 4GB RAM. Having installed Ubuntu 11.10 32-bit, while browsing with Chrome on GNOME classic (no effects), I noticed 173% CPU usage by chrome browser process, and the system slowly got very very slow, Now, at this stage as I removed the power adapter, the system suddenly got faster (and stopped the lagging behavior) and CPU usage drops down to 48% !! Observation 1: I was browsing through chrome when my system seemed to be seriously lagging, so I killed chrome to see if it gets any faster. But there remained no difference. Notice that CPU usage was a bit strange here. It showed no high activity, but as soon as I would click on applications in gnome panel, it would shoot CPU usage to 70, or 80 or 90 or 143% etc. depending on how quickly i clicked back and forth. At this instance I removed by AC adapter of my laptop, and suddenly system got fine. So i again clicked on gnome panel, and noticed that it now took only 7% or 12% or 13% at max, with same kind of clicks in application menu. Observation 2: At the other times, with AC adapter plugged in, top indicates four instances of chromium taking 90%, 60%, 47% and 2% (for example), and then once I take out the AC adapter same processes take lesser CPU all of a sudden Intermediate conclusions: What does this indicate ? I cannot figure out any "other" process in "top" that is suddenly being triggered, its the same process that hogs up my CPU once AC power is plugged in ! NOTE: the problem is now CONFIRMED, as i can repeat that when I have power adapter plugged in ! Can anyone tell me what exactly does this indicate ? What is wrong, is it some bug with power management or what ?

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• Fonts look bad in Microsoft Office using Wine

  - by amfcosta

  Office fonts in wine look very different from what they look in Windows or LibreOffice. As can be seen from the attached screenshots, they look blurry in some sizes and aliased in other sizes. You can see the differences not only in the document text but also in the ribbon menu. It happens with a lot of fonts. I'm testing it with Office 2010 now, but it also happens in Office 2007. Things I've tried: Changing fontsmooth settings with winetricks - made no difference. Copying fonts from a Windows system - made no difference. Using Ubuntu's fonts (by removing the Windows/Fonts from the wineprefix) - removed the blurriness in some fonts but increased aliasing. The three screenshots correspond to different "configurations": office_wine.png - Office Word in Wine using Wine's original fonts; office_nowinefonts.png - Office Word in Wine using Ubuntu's fonts; office_windows.png - Office Word in Windows. PS: please make sure to see the screenshots without scaling them to notice the problem. EDIT: A screenshot of how Calibri behaves in Wine here.

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• Suitability of ground fog using layered alpha quads?

  - by Nick Wiggill

  A layered approach would use a series of massive alpha-textured quads arranged parallel to the ground, intersecting all intervening terrain geometry, to provide the illusion of ground fog quite effectively from high up, looking down, and somewhat less effectively when inside the fog and looking toward the horizon (see image below). Alternatively, a shader-heavy approach would instead calculate density as function of view distance into the ground fog substrate, and output the fragment value based on that. Without having to performance-test each approach myself, I would like first to hear others' experiences (not speculation!) on what sort of performance impact the layered alpha texture approach is likely to have. I ask specifically due to the oft-cited impacts of overdraw (not sure how fill-rate bound your average desktop system is). A list of games using this approach, particularly older games, would be immensely useful: if this was viable on pre DX9/OpenGL2 hardware, it is likely to work fine for me. One big question is in regards to this sort of effect: (Image credit goes to Lume of lume.com) Notice how the vertical fog gradation is continuous / smooth. OTOH, using textured quad layers, I can only assume that layers would be mighty obvious when walking through them -- the more sparse they were, the more obvious this would be. This is in contrast to where fog planes are aligned to face the player every frame, where this coarseness would be much less obvious.

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• Crontab -e gives me error messages

  - by DNA

  I get a bunch of error messages when I run crontab -e Here are the error messages. And here is my crontab file under `/usr/bin/': # /etc/crontab: system-wide crontab # Unlike any other crontab you don't have to run the `crontab' # command to install the new version when you edit this file # and files in /etc/cron.d. These files also have username fields, # that none of the other crontabs do. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly 25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) 47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) 52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly ) 30 * * * * root rsync /home/dnaneet/Downloads/*.pdf /home/dnaneet/Downloads/pdfs/ # I notice that the last task ('rsync') NEVER RUNS! Why is this happening? What did I do wrong? Running Ubuntu 11.10/Bash. I have read this... Am I missing a shebang? And I don't know if my anacron jobs run. Edit 1 In light of Masi's comment, I commented out lines 17 thru 25 of my crontab file with #. Now when I run sudo crontab -e, all I get is: /usr/bin/crontab: 11: 17: not found /usr/bin/crontab: 12: 25: not found (gedit:4301): Gtk-WARNING **: Attempting to store changes into `/root/.local/share/recently-used.xbel', but failed: Failed to create file '/root/.local/share/recently-used.xbel.GOHVBW': No such file or directory (gedit:4301): Gtk-WARNING **: Attempting to set the permissions of `/root/.local/share/recently-used.xbel', but failed: No such file or directory What in the world?

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• Debugging the NetBeans Platform

  - by Geertjan

  Once you've set up the NetBeans Platform sources as your NetBeans Platform, you're able to debug the NetBeans Platform itself. That's an occasional question (certainly not a frequent question) on the mailing list and in NetBeans Platform courses: "Is it possible to debug the NetBeans Platform?" Well, here's how: Firstly, set up the NetBeans Platform sources as your NetBeans Platform. Now, open into NetBeans IDE the NetBeans module where you'd like to place a breakpoint. That in itself is the hardest part of this task. I.e., you know you want to debug the NetBeans Platform, but have no idea where to place your breakpoint. One way to figure that out, from 7.1 onwards, is to take a visual snapshot of the NetBeans Platform and then analyze that snapshot in NetBeans IDE. To do this, right-click a module that you've set as using the NetBeans Platform sources as your NetBeans Platform and then choose Debug. The application, i.e., the NetBeans Platform, including your custom module, starts up and you'll see this, i.e., NetBeans IDE in debug mode together with your NetBeans Platform application:Notice there's a new toolbar button (new in NetBeans IDE 7.1) that resembles an orange camera. Click that button and the IDE creates a visual snapshot of the running application, which in this case is the NetBeans Platform. When you click components in the visual snapshot, the Navigator and Properties window display information about the related GUI component: By clicking the above components, you can end up identifying the component you'd like to debug and even the module where it is found. Open that module. Set a breakpoint on the line of interest. Right-click the module again and choose Debug. A debug session starts and when the breakpoint is hit, the Debugger in the IDE will open and there you can step through the NetBeans Platform sources.

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• Syntactic sugar in PHP with static functions

  - by Anna

  The dilemma I'm facing is: should I use static classes for the components of an application just to get nicer looking API? Example - the "normal" way: // example component class Cache{ abstract function get($k); abstract function set($k, $v); } class APCCache extends Cache{ ... } class application{ function __construct() $this->cache = new APCCache(); } function whatever(){ $this->cache->add('blabla'); print $this->cache->get('blablabla'); } } Notice how ugly is this->cache->.... But it gets waay uglier when you try to make the application extensible trough plugins, because then you have to pass the application instance to its plugins, and you get $this->application->cache->... With static functions: interface CacheAdapter{ abstract function get($k); abstract function set($k, $v); } class Cache{ public static $ad; public function setAdapter(CacheAdapter $a){ static::$ad = $ad; } public static function get($k){ return static::$ad->get($k); } ... } class APCCache implements CacheAdapter{ ... } class application{ function __construct(){ cache::setAdapter(new APCCache); } function whatever() cache::add('blabla', 5); print cache::get('blabla'); } } Here it looks nicer because you just call cache::get() everywhere. The disadvantage is that I loose the possibility to extend this class easily. But I've added a setAdapter method to make the class extensible to some point. I'm relying on the fact that I won't need to rewrite to replace the cache wrapper, ever, and that I won't need to run multiple application instances simultaneously (it's basically a site - and nobody works with two sites at the same time) So, am doing it wrong?

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• Join the Geek+ Community on Google+ and Share Your Random Geekery

  - by The Geek

  It turns out that Google+ recently added a new feature that allows you to create your own community inside of Google+, where anybody that’s a member can post images, links, or start a discussion. We’ve created the Geek+ Community, so stop by and join in the fun. You’ll notice that there’s only a few members right now, but we’re hoping that we can get every How-To Geek reader to participate in the geeky discussion. You’re welcome to: Post random geeky stuff that you find. Yell at us for articles that you don’t like, or tell us how we can do things better. Participate in discussions with other HTG readers. Post up your own Geek Trivia. We might even publish it over here on How-To Geek. Ask others for advice. Just read everything that the other readers post. Lots of other things we can’t think of right now. Note: If you want tech support, you should post on our regular forum. Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• How Can I Know Whether I Am a Good Programmer?

  - by Kristopher Johnson

  Like most people, I think of myself as being a bit above average in my field. I get paid well, I've gotten promotions, and I've never had a real problem getting good references or getting a job. But I've been around enough to notice that many of the worst programmers I've worked with thought they were some of the best. Bad programmers who are surrounded by other bad programmers seem to be the most self-deluded. I'm certainly not perfect. I do make mistakes. I do miss deadlines. But I think I make about the same number of bonehead moves that "other good programmers" do. The problem is that I define "other good programmers" to mean "people who are like me." So, I wonder, is there any way a programmer can make some sort of reasonable self-evaluation? How do we know whether we are good or bad at our jobs? Or, if terms like good and bad are too ill-defined, how can programmers honestly identify their own strengths and weaknesses, so that they can take advantage of the former and work to improve the latter?

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• Hidden web standards behind Google "custom searchEngines"?

  - by Hoàng Long

  Today while playing with Google Chrome Omnibox, I notice a strange behavior. I guess there's some "hidden" web standard behind it, but can't figure it out. Here's how to reproduce: Go to http://edition.cnn.com/ Use the search function at the higher right corner, Search a random keyword, for example: "abc" Close the tabs. Open a new tab, type until Chrome reminds you about http://edition.cnn.com/, then press "Tab" The Omnibox now shows "Search CNN.com"! And when you type "abc" and press Enter, it uses the CNN search function to do the job, not Google! I also tried it for several different sites. To some it won't work. But to some sites, like CNN, vnexpress.net, it works after I use the search function of that site once. I also learnt about chrome://settings/searchEngines (type it in your chrome box and you will see), and learnt about you can add custom search engine in chrome. But the question is, why Chrome can realize the search URL automatically to some pages, and not others? It's not because some site subscribe to Google service, because I can do the same method for my site (http://ledohoanglong.wordpress.com), and I'm sure that there's no subscription. So I guess there's a method to "expose" the search function of a site, so that Google Chrome can catch it (after I call the search function of that site once, of courses). Does anyone know about how it works behind the scene?

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• Two Cloudy Observations from Oracle OpenWorld

  - by Gene Eun

  Now that the dust has settled from another amazing Oracle OpenWorld, I wanted to reflect back on a couple of key observations I made during the event. First, it was pretty clear that Cloud was again a big deal at this year's conference. It was hard to not notice that Oracle continues to be "all-in" with respect to cloud computing. Just to give you an idea of the emphasis on Cloud, there were over 300 Cloud-related sessions at this year's OpenWorld. If you caught some of the demo booths in the Oracle Red Lounge, then you saw some of the great platform, application, and social services that are now part of Oracle Cloud, as well as numerous demos of private cloud products that Oracle offers. Second, during Thomas Kurian's keynote presentation on Oracle Cloud, he announced the Preview Availability of a new service called Oracle Developer Cloud Service. This new platform service will provide developers with instant access to environments to better manage the application development lifecycle in the cloud. It provides development project teams access to favorite tools like Hudson, Git, Github, wikis, and tasks to help make innovation faster, more collaborative, and more effective. There's also integration with IDEs like Eclipse, NetBeans, and JDeveloper. If you're a developer, it's an awesome addition to Oracle Cloud's platform services! Want more details about Oracle Developer Cloud Service? Click here.

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• Is it just me or is this a baffling tech interview question

  - by Matthew Patrick Cashatt

  Background I was just asked in a tech interview to write an algorithm to traverse an "object" (notice the quotes) where A is equal to B and B is equal to C and A is equal to C. That's it. That is all the information I was given. I asked the interviewer what the goal was but apparently there wasn't one, just "traverse" the "object". I don't know about anyone else, but this seems like a silly question to me. I asked again, "am I searching for a value?". Nope. Just "traverse" it. Why would I ever want to endlessly loop through this "object"?? To melt my processor maybe?? The answer according to the interviewer was that I should have written a recursive function. OK, so why not simply ask me to write a recursive function? And who would write a recursive function that never ends? My question: Is this a valid question to the rest of you and, if so, can you provide a hint as to what I might be missing? Perhaps I am thinking too hard about solving real world problems. I have been successfully coding for a long time but this tech interview process makes me feel like I don't know anything. Final Answer: CLOWN TRAVERSAL!!! (See @Matt's answer below) Thanks! Matt

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• How do I properly use String literals for loading content?

  - by Dave Voyles

  I've been using verbatim string literals for some time now, and never quite thought about using a regular string literal until I started to come across them in Microsoft provided XNA samples. With that said, I'm trying to implement a new AudioManager class from the Net Rumble sample. I have two (2) issues here: Question 1: In my code for my GameplayScreen screen I have a folder location written as the following, and it works fine: menuButton = content.Load<SoundEffect>(@"sfx/menuButton"); menuClose = content.Load<SoundEffect>(@"sfx/menuClose"); If you notice, you'll see that I'm using a verbatim string, with a forward slash "/". In the AudioManager class, they use a regular string literal, but with two backslashes "\". I understand that one is used as an escape, but why are they BACK instead of FORWARD? (See below) soundList[soundName] = game.Content.Load<SoundEffect>("audio\\wav\\"+ soundName); Question 2: I seem to be doing everything correctly in my AudioManager class, but I'm not sure of what this line means: audioFileList = audioFolder.GetFiles("*.xnb"); I suppose that the *xnb means look for everything BUT files that end in *xnb? I can't figure out what I'm doing wrong with my file locations, as the sound effects are not playing. My code is not much different from what I've linked to above. private AudioManager(Game game, DirectoryInfo audioDirectory) : base(game) { try { audioFolder = audioDirectory; audioFileList = audioFolder.GetFiles("*.mp3"); soundList = new Dictionary<string, SoundEffect>(); for (int i = 0; i < audioFileList.Length; i++) { string soundName = Path.GetFileNameWithoutExtension(audioFileList[i].Name); soundList[soundName] = game.Content.Load<SoundEffect>(@"sfx\" + soundName); soundList[soundName].Name = soundName; } // Plays this track while the GameplayScreen is active soundtrack = game.Content.Load<Song>("boomer"); } catch (NoAudioHardwareException) { // silently fall back to silence } }

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• What to choose for a multilingual site with support for Markdown and commenting

  - by Kent

  I want to publish articles at a multilingual site. I want to be able to write an article in two languages and have them available on separate URLs: thesite.foo/english-breakfast thesite.com/engelsk-frukost If the users web browser is set to English I'd like to show a small notice at the top of the Swedish version with a link to the English one. The link should have an appropriate rel attribute for a translation (search for hreflang at http://diveintohtml5.org/semantics.html). There should be a way to list all articles belonging to these sets: Swedish only, English only, Swedish versions + English only, English versions + Swedish only. I'd like to publish these as four RSS-feeds. And I would like to have two versions of the main site, one in Swedish (showing Swedish versions + English only) and one in English (showing English versions). I shall be able to write the articles using Markdown, as that is the formatting language I find most convenient. There should be a way for users to comment. And some kind of way for me to protect myself against comment spam. I am leaning towards learning Drupal. I suspect I'll have to code this behavior myself as a module. To be frank I'd rather work with Java. Is Drupal the way to go? Or is there something more suitable for this project?

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• Selecting a JAX-RS implementation for a new project

  - by Fernando Correia

  I'm starting a new Java project which will require a RESTful API. It will be a SaaS business application serving mobile clients. I have developed one project with Java EE 6, but I'm not very familiar with the ecosystem, since most of my experience is on the Microsoft platform. Which would be a sensible choice for a JAX-RS implementation for a new project such as described? Judging by Wikipedia's list, main contenders seem to be Jersey, Apache CXF, RESTeasy and Restlet. But the Comparison of JAX-RS Implementations cited on Wikipedia is from 2008. My first impressings from their respective homepages is that: CXF aims to be a very comprehensive solution (reminds me of WCF in the Microsoft space), which makes me think it can be more complex to understand, setup and debug than what I need; Jersey is the reference implementation and might be a good choice, but it's legacy from Sun and I'm not sure how Oracle is treating it (announcements page doesn't work and last commit notice is from 4 months ago); RESTeasy is from JBoss and probably a solid option, though I'm not sure about learning curve; Restlet seems to be popular but has a lot of history, I'm not sure how up-to-date it is in the Java EE 6 world or if it carries a heavy J2EE mindset (like lots of XML configuration). What would be the merits of each of these alternatives? What about learning curve? Feature support? Tooling (e.g. NetBeans or Eclipse wizards)? What about ease of debugging and also deployment? Is any of these project more up-to-date than the others? How stable are them?

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• Displaying the Saved Pictures in the Windows Phone 8 emulator

  - by Laurent Bugnion

  One cool feature of the Windows Phone emulator is that it allows you to select pictures from your app (using the PhotoChooserTask) without having to try your app on a physical device. For example, this code (which I used in some of my recent presentations) will trigger the Photo Chooser UI to be displayed on the emulator too: private Action<IEnumerable<IImageFileInfo>> _callback; public void SelectFiles(Action<IEnumerable<IImageFileInfo>> callback) { var task = new PhotoChooserTask { ShowCamera = true }; task.Completed += TaskCompleted; _callback = callback; task.Show(); } void TaskCompleted(object sender, PhotoResult e) { if (e.Error == null && e.ChosenPhoto != null && _callback != null) { var fileName = e.OriginalFileName .Substring(e.OriginalFileName.LastIndexOf("\\") + 1); var info = new FileViewModel(e.ChosenPhoto, fileName); var infos = new List<IImageFileInfo> { info }; _callback(infos); } } In Windows Phone 8 however, when you execute this code, you will be shown an almost empty Photo Chooser UI: Notice that the “Saved Pictures” album is missing. At first I thought it was just not there at all, but you can actually restore it with the following steps: Press on the Windows button On the main screen, press on Photos Press on Albums Open the so called “8” photo album Press Back until you are back into your app and try again. This time you will see the saved pictures, and can perform your tests in more realistic conditions! Happy coding! Laurent   Laurent Bugnion (GalaSoft) Subscribe | Twitter | Facebook | Flickr | LinkedIn

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• What is a widely accepted term for a string variable that would probably contain a file path and file name?

  - by Peter Turner

  For functions that need to index files in a directory and rename them FileName0001, FileName0002, etc... I often need to write a function that splits the file name from the file path and rename the file. When I put the file name and file path back together, I don't have a very good name for the variable that contains both of them and I usually just wind up concatenating them every time I want to use them (usually using them as parameters for functions labeled either filename or filepath) so I never really know what I'm doing until I notice a lot of files being written in the same directory as my binaries. Anyway, what do I call a file name and a file path? I don't want to call it File, because that usually means the binary information behind the file. I don't want to call it URI because that usually means I've got some sort of protocol, which I don't. I just want a good way to denote "c:\somedir\somedir\somedir\somefile.txt" so as to deconfuse this mess I've just realized I'm in. Please don't just list your personal preference. I think an excellent answer should "'site its sources". (as in, provide a link to a repository with a good example of the code being used as I described)

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• "Serious errors found HF checking the drive for /home" After Moving /home to external HFSplus partition

  - by Arctic Shadow

  I just installed Mac OS X 10.7 "Lion" and Ubuntu 11.10 on my MacBook Pro. Using these instructions: tuxation.com/creating-home-partition-mac-linux.html . After changing the location of my home folder to the new location, it gives me the error in the title, and my username no longer appears in the login screen. Using the "Other" option with my username seems to make it try to log in, but the screen quickly flashes between blank and a shell before kicking me back to the login screen without notice. I'm trying to share my home folder between Mac OS X and Ubuntu, using an hfsplus partition (unjournaled) between the two. The home partition seems to mount fine as /home, and I am able to modify it under Ubuntu. Below is the line I've added to fstab: /dev/sda3 /home hfsplus defaults 0 1 I should also note that I changed my account's username and home directory location to match this, though I've double checked that and everything seems in order there... Thank you in advance for any assistance. Edit: It seems that the /etc/passwd file didn't have my new home directory's location in it, so I changed that, and I am now able to log into my account, although I am still not listed in the login screen, and my username in the menu on the top right shows up as "[Invalid UTF-8]"...

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• ASP.NET: Building tree picker dialog using jQuery UI and TreeView control

  - by DigiMortal

  Selecting things from dialogs and data represented as trees are very common things we see in business applications. In this posting I will show you how to use ASP.NET TreeView control and jQuery UI dialog component to build picker dialog that hosts tree data. Source code You can find working example with source code from my examples repository in GitHub. Please feel free to give me feedback about my examples. Source code repository GitHub Building dialog box As I don’t like to invent wheels then I will use jQuery UI to solve the question related to dialogs. If you are not sure how to include jQuery UI to your page then take a look at source code - GitHub also allows you to browse files without downloading them. I add some jQuery based JavaScript to my page head to get dialog and button work. <script type="text/javascript">     $(function () {         $("#dialog-form").dialog({             autoOpen: false,             modal: true         });         $("#pick-node")             .button()             .click(function () {                 $("#dialog-form").dialog("open");                 return false;             });     }); </script> Here is the mark-up of our form’s main content area. <div id="dialog-form" title="Select node">     <asp:TreeView ID="TreeView1" runat="server" ShowLines="True"          ClientIDMode="Static" HoverNodeStyle-CssClass="SelectedNode">         <Nodes>             <asp:TreeNode Text="Root" Value="Root">                 <asp:TreeNode Text="Child1" Value="Child1">                     <asp:TreeNode Text="Child1.1" Value="Child1.1" />                     <asp:TreeNode Text="Child1.2" Value="Child1.2" />                 </asp:TreeNode>                 <asp:TreeNode Text="Child2" Value="Child2">                     <asp:TreeNode Text="Child2.1" Value="Child2.1" />                     <asp:TreeNode Text="Child2.2" Value="Child2.2" />                 </asp:TreeNode>             </asp:TreeNode>         </Nodes>     </asp:TreeView>     &nbsp; </div> <button id="pick-node">Pick user</button> Notice that our mark-up is very compact for what we will achieve. If you are going to use it in some real-world application then this mark-up gets even shorter – I am sure that in most cases the data you display in TreeView comes from database or some domain specific data source. Hacking TreeView TreeView needs some little hacking to make it work as client-side component. Be warned that if you need more than I show you here you need to write a lot of JavaScript code. For more advanced scenarios I suggest you to use some jQuery based tree component. This example works for you if you need something done quickly. Number one problem is getting over the postbacks because in our scenario postbacks only screw up things. Also we need to find a way how to let our client-side code to know that something was selected from TreeView. We solve these to problems at same time: let’s move to JavaScript links. We have to make sure that when user clicks the node then information is sent to some JavaScript function. Also we have to make sure that this function returns something that is not processed by browser. My function is here. <script type="text/javascript">     function         $("#dialog-form").dialog("close");         alert("You selected: " + value + " - " + text);         return undefined;     } </script> Notice that this function returns undefined. You get the better idea why I did so if you look at server-side code that corrects NavigateUrl properties of TreeView nodes. protected override void OnPreRender(EventArgs e) {     base.OnPreRender(e);                 if (IsPostBack)         return;     SetSelectNodeUrls(TreeView1.Nodes); } private void SetSelectNodeUrls(TreeNodeCollection nodes) {     foreach (TreeNode node in nodes)     {         node.NavigateUrl = "javascript:selectNode('" + node.Value +                             "','" + node.Text + "');";         SetSelectNodeUrls(node.ChildNodes);     }        } Now we have TreeView that renders nodes the way that postback doesn’t happen anymore. Instead of postback our callback function is used and provided with selected values. In this function we are free to use node text and value as we like. Result I applied some more bells and whistles and sample data to source code to make my sample more informative. So, here is my final dialog box. Seems very basic but it is not hard to make it look more professional using style sheets. Conclusion jQuery components and ASP.NET controls have both their strong sides and weaknesses. In this posting I showed you how you can quickly produce good results when combining jQuery  and ASP.NET controls without pushing to the limits. We used simple hack to get over the postback issue of TreeView control and we made it work as client-side component that is initialized in server. You can find many other good combinations that make your UI more user-friendly and easier to use.

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• Auto Save and Auto Load Game onto the Device's Storage Concept Question

  - by David Dimalanta

  I'm trying to make a simple app that will test the save and load state. Is it a good idea to make an app that has an auto save and load game feature only every time the newbies open the first app then continues it on the other day? I tried making a sprite that is moving, starting at the center. When I close and re-open the app, the sprite goes back to the center instead of the last coordinate where the sprite land on this part (i.e. at the top). The thing I want to know how the sequence of saving and loading goes like this: I open the app The starting sprite at the center. It displays a coordinate of the sprite plus number of times does the sprite move. I exit the app that automatically saves the game without notice. Finally, when I re-opened it, it automatically loads the game retaining the number of times the sprite move, coordinates, and the sprite's area landed. These steps above are similar, but not the sprite movement test app, to the sequence of saving and loading the game's level and record in Jewel Stackers for the Android app. And, by default, if there is no SD card in any tab or phone that runs on Android, does it automatically save/load onto the internal drive or the APK file itself? Is it also useful to use auto save and auto load feature for protecting and fetching informations (i.e. fastest time, last time where the sprite is located via coordinates, etc.)?

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