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• Using a GPL licensed library in a commercial app

  - by user577616

  I develop an android application and in my app I use a libary (jar) that I download from the internet. This jar is open-source under the "GNU General Public License v2". I tried to read the text of the license but had difficulty understanding it. My question is: can I use this libary without changing nothing in the jar in a commercial application? I will be making profit from selling my app which uses this GPL-ed .jar file. If possible, I would like to avoid converting my application to open-source.

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• How to ensure that a member variable is initialized before calling a class method

  - by Omkar Ekbote

  There's a class with a parametrized constructor that initializes a member variable. All public methods of the class then use this member variable to do something. I want to ensure that the caller always creates an object using the parametrized constructor (there is also a setter for this member variable) and then call that object's methods. In essence, it should be impossible for the caller to call any method without setting a value to the member variable (either by using the parametrized constructor or the setter). Currently, a caller can simply make an object using the default constructor and then call that object's method - I want to avoid checking whether or not the member variable is set in each and every one of the 20-odd methods of the class (and throw an exception if it is not). Though a runtime solution is acceptable (better than the one I mentioned above); a compile-time solution is preferable so that any developer will not be allowed to make that mistake and then waste hours debuggging it!

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• usb keyboard stopped working in terminal window after update from 13.04 to 13.10

  - by Jim

  When I start the computer, I am logged in automatically. Using the keyboard, I type Ctrl+Alt+t, which brings up a terminal window, just like it should; however, nothing happens when I attempt to type into the terminal. If I change over to the guest account, I can type into the terminal, but (different problem here, I'll ask it separately unless someone is kind enough to answer it here) my password doesn't work for sudo or anything else. Elsewhere I read that Language support could fix it, but that won't accept my password either - and no, I haven't changed it lately. Also, my Plex Media Server seems to have disappeared. I'll re-install everything if necessary, but I sure would rather avoid that if possible

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• How can an application (like Firefox) be forced to use a certain network interface?

  - by Lekensteyn

  I've two interfaces: eth0 and wlan0 on a notebook. Possible use cases: eth0 grants me Internet access, and wlan0 is currently connected to a router which does not have Internet-connectivity. For development purposes, I need to connect to the wlan0 by default, but use eth0 for surfing eth0 and wlan0 are both connected to the Internet. For a torrent application, eth0 should be used for speed, but for portability of the notebook, SSH should have a connection over wlan0 eth0 is a wire connection, wlan0 is a wireless one. Sensible data should be transferred over eth0, but other traffic can go over wlan0 as well. Is there a way to force applications (like nc.traditional or firefox) to use a certain network interface? A wrapper like example-wrapper eth0 program is fine too if such program exist. It would be nice if it could configured within Firefox (in runtime). I'd like to avoid IPTables solutions if possible.

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• How to build list of items available in World of Warcraft?

  - by Cyclops

  There are a number of non-Blizzard sites that show a complete list of available items in World of Warcraft (such as wowhead, etc). I would like to know the best (easiest) way to compile a similar list. I believe some sites are based on user-entered input, which I would like to avoid. Looking at the lua API, it seems that there are functions to get a list of items, but it's not clear if I can just download everything (I remember a reference to throttling somewhere, can't find it now). Does anyone have code samples that would do this, or links to source? Also, Eve Online has made a database of items available (and I do mean SQL database file for download, not the Armory) - is there anything similar for Wow? I'm just looking for the names and stats, not the graphic icons.

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• Returning multiple results from one row [migrated]

  - by krock

  I have a set of MySQL data similar to the following: | id | type | start | end | ============================================= | 1 | event | 2011-11-01 | 2012-01-02 | | 2 | showing | 2012-11-04 | 2012-11-04 | | 3 | conference | 2012-12-01 | 2012-12-04 | | 4 | event | 2012-01-01 | 2012-01-01 | I want to retrieve events within a certain date range, but I also want to return individual results for each row that has a time span of more than one day. What's the best way to achieve this? Using PHP is a possibility, but I wanted to avoid doing this because I will need to to take pagination into account, etc. Any ideas would be greatly appreciated.

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• How to display consistent background image

  - by Tofu_Craving_Redish_BlueDragon

  Drawing a large background is relatively slow in PyGame. In order to avoid drawing BG every frame, you could draw it once, then do nothing. However, if something is overdrawn onto the surface and keeps moving, you will need to redraw the background in order to "erase" the color pixels left by moving object; otherwise, you will have "traces" of the moving object. I have a moving object in my PyGame. However, I do not want to "clear the color buffer" by redrawing the background image. Redrawing the background image every frame is slow. My solution : I will "clear" only required portions (where the "traces" of moving object are left) of the "buffer" by redrawing portions of background. Is there any other better way to have a consistent background?

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• Fujitsu B6220 laptop, sometimes my desktop freezes upon resume from standby

  - by user89756

  I installed Ubuntu 11.10 on my Fujitsu Lifebook B6220 laptop just before 12.04 was released. I can not remember if I had this issue with Ubuntu 11.10 as I updated the install to 12.04 about a week after 12.04 came out. My problem is that sometimes upon resume from standby my desktop is frozen. The keyboard, touch pad, and touchscreen work, but there is no response from the desktop. I can ctrl-alt-f2 and log in and then from there I just reboot the computer. This happens about 50% of the time when I resume from standby but I have not noticed a distinct pattern. I have thought about reinstalling 12.04, since I upgraded 11.10 to 12.04 instead of a fresh install. But I have customized my laptop a lot and I would prefer to avoid reinstalling it, I'm not even sure if that would fix it. Anyone have a idea what might be the problem? If I should submit this as a bug, could someone point me in the right direction please? Thanks, Matt

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• Structuring an input file

  - by Ricardo

  I am in the process of structuring a small program to perform some hydraulic analysis of pipe flow. As I am envisioning this, the program will read an input file, store the input parameters in a suitable way, operate on them and finally output results. I am struggling with how to structure the input file in a sane way; that is, in a way that a human can write it easily and a machine can parse it easily. A sample input file made available to me for a similar program is just a stream of comma-separated numbers that don't make much sense on their own, so that's the scenario I am trying to avoid. Though I am giving the details of my particular problem, I am more interested in general input-file structuring strategies. Is a stream of comma-separated values my best bet? Would I be better off using some sort of key:value structure? I don't know much about this, so any help will probably put me in a better track than I am now.

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• reinstalling totem 3.0.1 from source

  - by user1537727

  I have totem 3.0.1 installed on my system, but I wish to install from source the same and when I do so i am presented with the following dependency errors. How can this be possible? configure: error: Package requirements ( glib-2.0 >= 2.27.92 gio-2.0 >= 2.27.92 gtk+-3.0 >= 2.99.3 gdk-x11-3.0 >= 2.99.3 gmodule-2.0 totem-plparser >= 2.32.4 gstreamer-tag-0.10 >= 0.10.26 cairo) were not met: No package 'totem-plparser' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables DEPENDENCY_CFLAGS and DEPENDENCY_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details.

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• Alternatives to using cookies?

  - by theclueless1

  Whate are alternatives to using cookies/client-side storage for a PHP/MySQL based site on Apache. Scenario/Requirements: I want to try using some anti-bot code to prevent specific scrapers etc. from accessing the site. I would like to run this code before launching the rest of the site (before DB access etc.). I don't want to constantly run the same code on every page-load after a visitor has passed the initial check. I'd like to avoid the use of Cookies/Client side storage if at all possible. The only solution I can currently think of is to write files to the server based on the visitors IP/UA, or to write a list of them to a single file. Yet this has the limitation of multiple users through a proxy/same connection, etc ... So, any ideas/suggestions? Or am I simply over working the issue?

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• "Google files": Building a web interface to find/ack/grep

  - by user27915816

  I am working on a project where we would like to have build a web interface that gives the user the ability to "Google" files in a directory in a remote machine. For example, the user would type a string in a box, and then the system would find all files that contain that string and present them in the browser. The system would then give the user the ability click on any of the files to open them/display them in the browser. We want to avoid reinventing the wheel if possible, but don't really know where to start (none of us in the team have much experience building websites). What software packages, libraries or tools exist that can help us get this done?

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• Collapsible menu and amount of links in a web page

  - by dstonek

  One of my pages contain three levels of a collapsible menu (JS + CSS from mycssmenu.com). There are a dozen first level items displayed to users, each one with various second level items, and finally a lot of third level items, each one containing a related link. This generates a lot of internal links (300+). Because of SEO should I change the way the collapsible menu is displayed to reduce link amount? What do you suggest? I would like to avoid users to have to open a new page just to only see what are third level items and eventually follow one of its links.

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• Getting collision detection in Pygames

  - by user36010

  I am writing a game in Pygame, I want to get collision detection. The aim is when a object hits another, the target object disappears. I want to avoid having classes and just have my code class less for now, in one script. This makes it difficult to get collision detection because the Rect method in Pygame is called on by an object(class). The logic I want to achieve is: object hits a target object target object disappears. is there an easy way to achieve this?(with minimal code possible)

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• Website custom tracking

  - by Francisco Goldenstein

  I'm using ASP.NET MVC 4 and I want to track the incoming traffic of my site to know things like: 1) How many users that clicked a Google Adwords advertisement have bought one particular product? 2) Ranking of buyers grouped by Google Adwords advertisements. I could add a parameter to the URL like mysite.com?source=advertisement1234 but I want to avoid this practice to have cleaner URLs and for SEO purposes. Url.Referrer is not going to give me that information either, it's just going to say that the referrer is Google. Any suggestions? Thanks in advance!

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• Cursor-Killing: Accessing Data in the Next Row

  Cursors are considered by many to be the bane of good T-SQL. What are the best ways to avoid iterative T-SQL and to write queries that look and perform beautifully? This first part in an ongoing series of cursor-killing handles inter-row analysis. 24% of devs don’t use database source control – make sure you aren’t one of themVersion control is standard for application code, but databases haven’t caught up. So what steps can you take to put your SQL databases under version control? Why should you start doing it? Read more to find out…

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• Advice on what to learn? [closed]

  - by ICTech

  Currently I work as a .NET C# programmer, quite fresh faced at that (only been working professionally for 8 months) I'm enjoying what I'm doing, but I'm now thinking ahead for other languages to learn. I've heard from quite a few seasoned developers that they reckon it's worth getting in to HTML5. Before I asked this question I read a few of the other questions similar to this, but most were dated back a few years. I'm wondering what your advice would be to an aspiring programmer, what I should avoid going for (i.e. as I understand it Flash is essentially going to be phased out due to HTML5) I was looking in to WPF and the more updated .NET technologies, but someone advised me that WPF stuff will probably be redundant in the future. Thanks for your advice and opinions :)

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• Failed to allocate memory - What is it trying to say?

  - by asprin

  In my early days of programming I often used to get memory related fatal errors in the following format: Fatal error: Allowed memory size of <some big number> bytes exhausted (tried to allocate <some small number> bytes) in /path/to/filename.php on line <some line number> I'm a little embarrassed to state that even though I have figured out how to solve them and take steps to avoid them altogether, I'm still not quite sure what exactly does the message translate to in simple words. For example, if I get a message such as: Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 4000 bytes) in ........ on line 34 As things stand at the moment, I assume it to be stating that the script consumes 67108864 bytes of data, but only 4000 bytes are available during runtime. Am I right in my assumption? If not, what's the correct interpretation?

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• ACPI Events not triggered after booting

  - by user3208188

  I purchased a Convertible (Laptop and Tablet, Ubuntu 14.04 installed) and would like to execute a script when changing from laptop to tablet mode and the other way around. So I created two new files within the /etc/acpi/events folder corresponding to two new scripts in the /etc/acpi folder. Everything works well if I create a new acpid process (e.g "sudo acpid -c /etc/acpi/events -s /var/run/acpid.socket") manually. However, if I do not initiate this process manually the scripts are not executed, even though there is a process running with the same options right after the machine has booted by default. The only difference I can find is the parent pid. If I create the process the parent is "init --user", while the parent of the automatically initiated process is "/sbin/init". Can anyone help me by explaining why this issue happens and how I can avoid to start an acpid process manually every time I boot the device?

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• Joining and compressing all javascript files together - good idea?

  - by Tomáš Zato

  Curently, I avoid loading any unnecesary scripts on individual pages of my site. I have a class that remembers all javascript files that were requested during PHP processing and adds them to HTML. I was just thinking that I could merge the current set of files, save the result in special directory and let the browser download just one, big file. Since the number of possible combinations is not very high, I would end up with about 10 combined files for different pages. I've never seen that on any site. What are the reasons not to do it? I need very fast page load.

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• Using mocks to set up object even if you will not be mocking any behavior or verifying any interaction with it?

  - by smp7d

  When building a unit test, is it appropriate to use a mocking tool to assist you in setting up an object even if you will not be mocking any behavior or verifying any interaction with that object? Here is a simple example in pseudo-code: //an object we actually want to mock Object someMockedObject = Mock(Object.class); EqualityChecker checker = new EqualityChecker(someMockedObject); //an object we are mocking only to avoid figuring out how to instantiate or //tying ourselves to some constructor that may be removed in the future ComplicatedObject someObjectThatIsHardToInstantiate = Mock(ComplicatedObject.class); //set the expectation on the mock When(someMockedObject).equals(someObjectThatIsHardToInstantiate).return(false); Assert(equalityChecker.check(someObjectThatIsHardToInstantiate)).isFalse(); //verify that the mock was interacted with properly Verify(someMockedObject).equals(someObjectThatIsHardToInstantiate).oneTime(); Is it appropriate to mock ComplicatedObject in this scenario?

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• PASS Summit 2013, a Hit in Charlotte! (and an apology)

  - by andyleonard

  I had a great time at the PASS Summit 2013 this past week in Charlotte! I spoke to several people who told me they were pleasantly surprised by the venue and the event. Charlotte rocks! As a NASCAR fan, I particularly enjoyed the Community Event held at the NASCAR Hall of Fame . It is always an honor to present and I was honored to deliver Designing an SSIS Framework and to participate in a cool panel discussion titled How to Avoid Living at Work: Lessons from Working at Home . Panel discussions...(read more)

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• How do you usually manage callbacks in Java using Swing library?

  - by none

  I'm quite new to the Java Swing programming, and GUI development as well. As a beginner, I'm currently reading Design Pattern, but finding what I'm looking for is quite hard, most of the times. So far, I've never had huge problems defining a view hierarchy - I just use to subclass component from component. But the hard-to-do here is how managing callbacks, which often become hard to maintain due to the hard code. During my last projects, I tried to separate GUI, Listener and Callbacker objects which cooperated together, but in this way it was really hard adding new features. So, which kind of best patterns or best practices do you tend to use when trying to maintain, add new features or even worst avoid to hard-code classes which manage callbacks method in this kind of frameworks (mainly Java Swing)?

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• Moving a LAMP set up from 32 bit to 64 bit

  - by user10157

  Hello everyone... I have setup an Ubuntu server 10.10 32bit on an old Dell D610 Laptop for testing. I have the latest PHP, MySQL and Apache with Wordpress installed. After the testing is over and once I finish adding material to my wordpress I will build a Ubuntu 10.10 64bit VM on Hyper-V. What I am wondering is , if it's best practice to build everything from scratch (which will take me more time and would like to avoid) or transfer the database and all other settings? If I choose to transfer how and what I need to do? Here's where I'd like some help as I am still an intermediate admin (If I can call it that!) I am looking forward for your help. Thanks!

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• Installing Ubuntu before or after upgrading from Vista to Win 7?

  - by amh

  I just got a new SSD hard drive for my thinkpad laptop. I just installed Vista with the factory CDs. On my old OS, my main OS was Ubuntu but I do want to keep Windows on a separate partition as a dual booth system. I definitely want to upgrade to Win 7 though and I will get it in a few days. My question is: should I install Ubuntu now and then upgrade to Win 7 in a few days? or is that going to mess up with the grub (or something else)? If that is the case, then I'd rather wait to install Ubuntu until after I upgrade to Vista. P.S. I know that probably any kind of mess done by the Win upgrade could be fixed, but I just want to avoid wasting time.

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