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• Why Use !boolean_variable Over boolean_variable == false

  - by ell

  A comment on this question: Calling A Method that returns a boolean value inside a conditional statement says that you should use !boolean instead of boolean == false when testing conditions. Why? To me boolean == false is much more natural in English and is more explicit. I apologise if this is just a matter of style, but I was wondering if there was some other reason for this preference of !boolean?

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• 12.10 cifs shares not mounting after modifying /etc/fstab

  - by Doug

  From Ubuntu 11.04 to 12.04 i've been able to mount my nas shares by first making directories in the /media folder, then : sudo gedit /etc/fstab to include the following line for each share I want to auto-mount; //servername/sharename /media/windowsshare cifs guest,uid=1000,iocharset=utf8,codepage=unicode,unicode 0 0 Now, however, I upgraded to 12.10, and suddenly I'm not able to mount the shares after saving /etc/fstab and sudo mount -a, giving me this error: Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) mount error(22): Invalid argument When in Nautilus, The shares are visible under the network tab, unmounted, and when I click on a share, I get the following message: mount: only root can mount //192.168.1.71/photos on /media/photos I checked to ensure smbfs was installed, and no problems there. I'm stumped.

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• Android Touch Event Collision Detection

  - by chrissb

  I'm relatively new to both Java and Android, so hopefully the problem I'm having is stemming from something pretty minor that I've overlooked. I've got a (very early stage) game that I've started working on, for Android using Java. At this stage, when the user touches the screen, if they touched a point at which there is an enemy, the enemies health is decreased and they become immobile (for the current implementation at least). The issue that I'm having is that the touch detection doesn't always seem to work. I've got a testing sprite set up that goes to the eventX and eventY coordinates of the touch down event, and it always seems to collide with the enemy object. Yet, the enemy doesn't always register as being hit, and sometimes a hit is registered when the sprite indicates the touch coordinates were outside of the enemies bounding box. I realise that this probably doesn't mean much without any code, so here's what I've got so far. Be gentle, as this is literally my first attempt at something more than basic movement etc. First off, the MainGamePanel class registers the touch event, and informs the levelmanager class (which is what I set up to monitor/handle enemies) public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN){ levelManager.handleActionDown((int)event.getX(), (int)event.getY()); targetX=event.getX(); targetY=event.getY(); } if (event.getAction() == MotionEvent.ACTION_MOVE) { //the gestures } if (event.getAction() == MotionEvent.ACTION_UP) { //touch was released } return true; } From there, in the levelmanager class the touch event is passed on to all of the enemies within a list array: public static void handleActionDown(int eventX,int eventY){ hit=false; for (enemy1 en : enemy1array){ en.handleActionDown(eventX, eventY); } } The rest of the collision code is handled within the enemies handleActionDown function: public void handleActionDown(int eventX, int eventY) { if(eventX>this.x-enemy1bitmap.getWidth() && eventX<this.x+enemy1bitmap.getWidth() && eventY>this.y-enemy1bitmap.getHeight() && eventY<this.x+enemy1bitmap.getHeight()){ takeDamage(1); levelmanager.setHit(); } } I should probably be using getWidth()/2 and getHeight()/2 for it to be more accurate, but I expanded the area to test this - although I've noticed no improvement. At this stage, the games detection over whether or not the enemy is hit is spotty at best. Generally it takes two or three attempts before a collision is successfully registered, even though the sprite that is being used for testing and set to the eventX and eventY coordinates always indicates that the collision should have worked. Hopefully someone can steer me in the right direction here, and if more information is needed, ask away! Cheers, -Chris

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• Unable to Install GRUB in /dev/sda on raid drives

  - by Henry

  I'm trying to install 12.04LTS on a server but keep running into the unable to install grub error like so "Unable to Install GRUB in /dev/sda". The drives are in raid1 and I'm using fakeraid on a supermicro motherboard, which according to the manual is fully supported. I've tried installing both from USB and CD-R but still no luck. I'm not dual booting with any other OS, just using 2x320gb drives and have been choosing to install using the entire disk. Any ideas what I'm doing wrong or can do to fix this? Thanks

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• Behavior Driven Development (BDD) and DevExpress XAF

  - by Patrick Liekhus

  So in my previous posts I showed you how I used EDMX to quickly build my business objects within XPO and XAF.  But how do you test whether your business objects are actually doing what you want and verify that your business logic is correct?  Well I was reading my monthly MSDN magazine last last year and came across an article about using SpecFlow and WatiN to build BDD tests.  So why not use these same techniques to write SpecFlow style scripts and have them generate EasyTest scripts for use with XAF.  Let me outline and show a few things below.  I plan on releasing this code in a short while, I just wanted to preview what I was thinking. Before we begin… First, if you have not read the article in MSDN, here is the link to the article that I found my inspiration.  It covers the overview of BDD vs. TDD, how to write some of the SpecFlow syntax and how use the “Steps” logic to create your own tests. Second, if you have not heard of EasyTest from DevExpress I strongly recommend you review it here.  It basically takes the power of XAF and the beauty of your application and allows you to create text based files to execute automated commands within your application. Why would we do this?  Because as you will see below, the cucumber syntax is easier for business analysts to interpret and digest the business rules from.  You can find most of the information you will need on Cucumber syntax within The Secret Ninja Cucumber Scrolls located here.  The basics of the syntax are that Given X When Y Then Z.  For example, Given I am at the login screen When I enter my login credentials Then I expect to see the home screen.  Pretty easy syntax to follow. Finally, we will need to download and install SpecFlow.  You can find it on their website here.  Once you have this installed then let’s write our first test. Let’s get started… So where to start.  Create a new testing project within your solution.  I typically call this with a similar naming convention as used by XAF, my project name .FunctionalTests (i.e.  AlbumManager.FunctionalTests).  Remove the basic test that is created for you.  We will not use the default test but rather create our own SpecFlow “Feature” files.  Add a new item to your project and select the SpecFlow Feature file under C#.  Name your feature file as you do your class files after the test they are performing. Now you can crack open your new feature file and write the actual test.  Make sure to have your Ninja Scrolls from above as it provides valuable resources on how to write your test syntax.  In this test below you can see how I defined the documentation in the Feature section.  This is strictly for our purposes of readability and do not effect the test.  The next section is the Scenario Outline which is considered a test template.  You can see the brackets <> around the fields that will be filled in for each test.  So in the example below you can see that Given I am starting a new test and the application is open.  This means I want a new EasyTest file and the windows application generated by XAF is open.  Next When I am at the Albums screen tells XAF to navigate to the Albums list view.  And I click the New:Album button, tells XAF to click the new button on the list grid.  And I enter the following information tells XAF which fields to complete with the mapped values.  And I click the Save and Close button causes the record to be saved and the detail form to be closed.  Then I verify results tests the input data against what is visible in the grid to ensure that your record was created. The Scenarios section gives each test a unique name and then fills in the values for each test.  This way you can use the same test to make multiple passes with different data. Almost there.  Now we must save the feature file and the BDD tests will be written using standard unit test syntax.  This is all handled for you by SpecFlow so just save the file.  What you will see in your Test List Editor is a unit test for each of the above scenarios you just built. You can now use standard unit testing frameworks to execute the test as you desire.  As you would expect then, these BDD SpecFlow tests can be automated into your build process to ensure that your business requirements are satisfied each and every time. How does it work? What we have done is to intercept the testing logic at runtime to interpret the SpecFlow syntax into EasyTest syntax.  This is the basic StepDefinitions that we are working on now.  We expect to put these on CodePlex within the next few days.  You can always override and make your own rules as you see fit for your project.  Follow the MSDN magazine above to start your own.  You can see part of our implementation below. As you can gather from the MSDN article and the code sample below, we have created our own common rules to build the above syntax. The code implementation for these rules basically saves your information from the feature file into an EasyTest file format.  It then executes the EasyTest file and parses the XML results of the test.  If the test succeeds the test is passed.  If the test fails, the EasyTest failure message is logged and the screen shot (as captured by EasyTest) is saved for your review. Again we are working on getting this code ready for mass consumption, but at this time it is not ready.  We will post another message when it is ready with all details about usage and setup. Thanks

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• Oracle Magazine, May/June 2009

  Oracle Magazine May/June features articles on Developer solutions, Oracle and Windows support for midsize businesses, application testing solutions, custom frameworks, ODP.NET transactions, managing literal values with PL/SQL, modernizing Oracle Forms, customizing Oracle Application Express, improving performance in Oracle Database 11g, Tom Kyte answering your questions and much more.

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• Configure mounting timeout at boot

  - by René Pieters

  On remotely rebooting a 12.04 machine I found it hanging at the "unable to mount soandso: Skip, Manual Abort? " (That's pretty much how I remember the message) The machine was basically stopped there until I hooked up a keyboard and pressed "s". I can see the rationale for the question, but I'd really like to know where to configure it or turn it off altogether. A mandatory question like this makes sense in a desktop environment but for servers I'd like more flexibility. So where do I fiddle and tweak this?

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• What You Said: How You Customize Your Computer

  - by Jason Fitzpatrick

  Earlier this week we asked you to share the ways you customize your computing experience. You sounded off in the comments and we rounded up your tips and tricks to share. Read on to see how your fellow personalize their computers. It would seem the first stop on just about everyone’s customization route is stripping away the bloat/crapware. Lisa Wang writes: Depending on how much time I have when I receive my new machine,I might do the following in a few batches, starting with the simplest one. Usually, my list goes like this:1.Remove all bloatware and pretty much unneeded stuffs.2.Change my wallpaper,login screen,themes, and sound.3.Installing my ‘must-have’ softwares-starting with fences and rocketdock+stacks plugin4.Setting taskbar to autohide, pinning some apps there5.Installing additional languages6.Tweaking all settings and keyboard shortcuts to my preferance7.Changing the icons(either manual or with TuneUp Styler) Interface tweaks like the aforementioned Fences and Rocket Dock made quite a few appearances, as did Rainmeter. Graphalfkor writes: How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

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• Downloading 12.04 Beta today - Does it now have the daily distro updates?

  - by Stephen Myall

  I downloaded the 12.04 Beta 2 on the day of launch and have been testing and sending bug reports. I now want to install it on another machine. My question is do I use the original image I downloaded and apply the daily distro updates through Update manager OR do a download a new image (because it now has the distro updates included). To be clear I am asking does the 12.04 Beta 2 ISO get updated on a daily basis?

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• Rel = translation

  - by Tom Gullen

  I can't find much online about rel="translation" We have tutorials and manual entries which we are going to get users to translate. If the original page in English is: http://www.scirra.com/tutorial/start And there are two translations: http://www.scirra.com/tutorial/es/start (spanish) http://www.scirra.com/tutorial/de/start (german) How would I correctly link all these up? I'm aware at the top of the page I would need to specify the correct IS639-1 code: <html lang="de"> But I'm more interested in letting Google know they are not duplicates but are translated.

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• How to get working cups command line tools on Server 14.04

  - by Nick

  It looks like some of the commands like lpr and lprm have broken versions that don't work with cups. These commands worked properly on 10.04. lpr for cups has an -o option, but no lpr is intalled when cups is installed, and the lpr installed with apt-get install lpr does not have the -o option and does not appear to be the cups version of lpr. man lpr shows BSD General Commands Manual at the top, where man lpr on the Ubuntu 10.04 server said Apple, inc in the same spot. which leads me to believe the "wrong" lpr is in the "lpr" package or package names got moved around. There is also a lprng package, but trying to install it wants to remove cups and cups-client. lprm also returns lprm: PrinterName: unknown printer when PrinterName is in fact a valid printer installed with cups and does appear in lpstat -t. How do I get the proper cups versions of lpr working on Server 14.04?

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• Linux Under The Spotlight As We Prepare For A Chaos Bound National Elections

  <b>Tech Source:</b> "With less than a few days to go before the Philippines will hold its first ever fully automated national elections, it seems like we're in for a really bumpy ride. Serious, embarrassing, and idiotic technical glitches were discovered while testing the Precinct Count Optical Scan (PCOS) machines that will be used to count votes for the polls."

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• How do I get an HP 1018 laser printer to work on 12.04?

  - by MInner

  edit : already printed on windows-machine Ubuntu 12.04, LJ 1018. I've tried making foo2zjs from sourse. I've downloaded firmware and placed it where necessarily manually from here I've also tried this - same as manual dowload but with some patches like stoping cups, etc.. I've fixed usbfs: process 11200 (usb) did not claim interface 0 before use problems using sudo rmmod usblp as described here. And now I have Aug 10 11:51:59 pav /usr/sbin/hplj1018: foo2zjs: usb://HP/LaserJet%201018?serial=KP07RLV... download failed. Aug 10 11:51:59 pav /usr/sbin/hplj1018: foo2zjs: loading HP LaserJet 1018 firmware /lib/firmware/hp/sihp1018.dl to CUPS USB device ... error. Before that prinet was stucking on "Sending data to printer". Now it's code is "Not connected". Unless ben@pav:~$ lsusb ... Bus 001 Device 015: ID 03f0:4117 Hewlett-Packard LaserJet 1018 Thank you.

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• Creating collection with no code (almost)

  - by Sean Feldman

  When doing testing, I tend to create an object mother for the items generated multiple times for specifications. Quite often these objects need to be a part of a collection. A neat way to do so is to leverage .NET params mechanism: public static IEnumerable<T> CreateCollection<T>(params T[] items) { return items; } And usage is the following: private static IEnumerable<IPAddress> addresses = CreateCollection(new IPAddress(123456789), new IPAddress(987654321));

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• Hello, World!

  - by codingbloke

  This is my first blog.  Currently just testing to see what skin I prefer. Union Square Software Bullet 1 Bullet 2 Bullet 3

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• How to boot from a debootstrap based install?

  - by João Pinto

  I would like to boot a testing Ubuntu release from a directory (which contains a debootstrap based install). As far as I understand I just need someway to tell the boot process (initrd scripts?) that it should chroot() into the specified dir immediately after mounting the root partition, and then resume the regular upstart/init start. Could someone provide some instructions on how to achieve this?

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• 12.04 Dual Monitor Configuration changes to "Mirrored" automatically

  - by Josef

  After installing 12.04 on my Samsung X120 Notebook (with Intel GMA 4500 internal graphics card) i have a Problem with the configuration off my 2nd monitor. Its a 22" with 1680 * 1050 Pixel connected via HDMI. I use the display configuration and set internal display=off and external display=main display. That works fine. After rebooting i still have that configuration, but after a while (often when i press a button on the keyboard), the configuration automatically changes to "Mirror Screen" and the internal display switches on. Both displays then have a bad resolution. When i do the manual display configuration again, everything is fine for the duration of that session. What could be the problem, that this display configuration gets lost / resets?

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• Strategy for building an application to replace a large spreadsheet

  - by Dan Walmsley

  I'm working on an application that is going to replace a rather large spreadsheet. The spreadsheet is used to budget purchases and things like that. It is the largest spreadsheet I have ever seen, and it required a lot of manual data entry, so this application is going to automate much of that. But as I'm working on this I've noticed its slow going. And I got to thinking this must be a common thing to do many companies will start with something like a spreadsheet, then when they get too big to maintain that, they will get a custom application built. So is there anything out there ( a framework or similar ) that does this sort of thing, migrating a spreadsheet to a custom application. I've had a quick Google but not really seen the kind of thing that I'm looking for. It's too late for this project, but I thought it would be worth having a look for next time. How do you guys tackle this problem?

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• Cannot mount a CIFS network share on Ubuntu over VPN

  - by Aron Rotteveel

  I have setup u VPN connection to our Windows 2008 server at the office and it seems to work fine. For some reason, however, I still am not able to access the network shares over a VPN connection using my standard fstab entries. When I am physically connected to the network, it works fine, but now when trying this over VPN I get the following error: mount error(110): Connection timed out Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) My /etc/fstab looks like this: //server2008/share /mnt/share cifs iocharset=utf8,credentials=/home/aron/.smbcredentials,uid=1000 0 0 As said, it works fine when physically connected, but over VPN it just wont work. Any help is appreciated.

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• Migrating from OCS 2007 R2 to Lync: Part 2

  In the story so far, Johan has described how to check that the migration from your OCS to Lync is supported and how to determine the requirements for the new installation This was followed by a walk-through of the preparation the Active Directory and installation of the first Lync Front End Server with a Mediation Server co-located. Now Johan tackles the merging the OCS configuration, and connection to the outsode world, followed by testing, performing and then validating the migration.

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• Nester

  - by csharp-source.net

  Nester is a tool for mutation testing of your C# source code in order to assess the adequacy of your unit tests. It involves modification of programs to see if existing tests can distinguish the original program from the modified program.

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• 10 unexpected online user behaviours to look out for

  When designing a website, there are key user behaviours that should be taken into account. But in order to take them into account, it helps to know them. Below are 10 of the more interesting and less well-known user behaviours that regularly occur in user testing.

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• Database Delivery Patterns and Practices

  Continuous database delivery is an automated process for building, deploying and testing databases to reduce risk and make rapid releases possible. It's enabled by a pipeline that starts when database changes are checked in, and ends when they're deployed to production. The articles collected here will help you understand the theories and methodologies behind every stage of the database delivery pipeline.

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• ASP.NET MVC Case Study on StackOverflow.com

  Learn how StackOverflow.com, the popular question and answer website, used ASP.NET MVC to enhance performance, enable faster development and ease code testing and maintenance.

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• New OPN Certified Implementation Exam - Oracle Enterprise Manager 12C Essentials

  - by Javier Puerta

  This exam (1Z1-457) is now available in Beta testing. This certification differentiates candidates in the marketplace by providing a competitive edge through proven expertise and is intended for professionals who possess a strong technical background and exposure to Oracle Enterprise Manager 12c implementation. Take advantage and request a free beta exam voucher to [email protected]. Invite your partners to learn more about this exam here.

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