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• What have you learned from the bugs you helped discover and fix?

  - by Ethel Evans

  I liked the core of this question, and wanted to re-ask it in a way that made it less about 'fun' and more about 'What do these past mistakes tell us about how we can write and test software better?' As an SDET, I'm always looking for anecdotes about new and interesting ways that programs can fail. I've learned a lot from these tales in the past, and would like to get that from the intelligent people in this community as well. I'd be interested in hearing what the issue was, how it was caught, if you think there was anything that could have reasonably done to catch it earlier or to avoid the same issue on later projects, and any other interesting lessons you took away from this bug. Please only write about bugs you personally were involved with, ideally on a project you worked on (e.g., no "10 years before I was born, this happened and it was FUNNY!" answers). Please vote up answers that are thought-provoking or could change how you develop or test in some way, so this isn't just 'social fun'. Try to avoid voting up something just because it was funny.

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• Jittery Movement, Uncontrollably Rotating + Front of Sprite?

  - by Vipar

  So I've been looking around to try and figure out how I make my sprite face my mouse. So far the sprite moves to where my mouse is by some vector math. Now I'd like it to rotate and face the mouse as it moves. From what I've found this calculation seems to be what keeps reappearing: Sprite Rotation = Atan2(Direction Vectors Y Position, Direction Vectors X Position) I express it like so: sp.Rotation = (float)Math.Atan2(directionV.Y, directionV.X); If I just go with the above, the sprite seems to jitter left and right ever so slightly but never rotate out of that position. Seeing as Atan2 returns the rotation in radians I found another piece of calculation to add to the above which turns it into degrees: sp.Rotation = (float)Math.Atan2(directionV.Y, directionV.X) * 180 / PI; Now the sprite rotates. Problem is that it spins uncontrollably the closer it comes to the mouse. One of the problems with the above calculation is that it assumes that +y goes up rather than down on the screen. As I recorded in these two videos, the first part is the slightly jittery movement (A lot more visible when not recording) and then with the added rotation: Jittery Movement So my questions are: How do I fix that weird Jittery movement when the sprite stands still? Some have suggested to make some kind of "snap" where I set the position of the sprite directly to the mouse position when it's really close. But no matter what I do the snapping is noticeable. How do I make the sprite stop spinning uncontrollably? Is it possible to simply define the front of the sprite and use that to make it "face" the right way?

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• What Does Installing Ubuntu "Alongside" Windows Entail?

  - by Soft Skeleton

  I recently posted a question about an error I was receiving trying to access Ubuntu from the boot menu. I am using Windows 7 and Ubuntu 12.x (I THINK because I haven't accessed it in over a year due to being unable to run an important program for one of my classes on Ubuntu). On another laptop, I partitioned the hard drive and installed Windows and Ubuntu on the partitions. On this laptop, I simply installed Ubuntu from Windows, picking the option "alongside Windows", and didn't partition my hard drive manually. I was under the impression "alongside" entailed that Ubuntu would partition my hard drive, and that if I were to return my Windows partition to factory settings it would not affect the Ubuntu partition. However, given my current problem, I am wondering if I was mistaken in this assumption? When installing Ubuntu from Windows, selecting "alongside" Windows as the option from the Ubuntu installer, does that simply install Ubuntu within the Windows partition and thus returning it to factory settings would wipe out anything I had on the Ubuntu OS as well? Ubuntu is still in the boot menu as an option, but when I try to access it it says the drive is "corrupt" and wubi is mentioned in the error. I additionally tried to download a program ran from Windows to investigate partitions and there were no sign of my Ubuntu partition viewable from Windows. Is it possible Windows just can't see it? Any insight, corrections or answers is appreciated.

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• After upgrading to trusty, ALSA midi connection (aconnect) doesn't seem to work right

  - by SougonNaTakumi

  Previously in kubuntu 13.10 I was able to open vmpk or plug in a midi keyboard, and provided that TiMidity was running in server mode, I could run aconnect [keyboard port (129:0 for vmpk)] 14:0 aconnect 14:0 128:0 and I could play the keyboard and get sound. But now, a while after upgrading to trusty, I tried to do that, and didn't get any sound. TiMidity itself still plays files fine, but if I try to play them with aplaymidi, I still just get silence. Oddly, the midi files are clearly being read. When I ran (where 130:0 was vmpk's input port) aplaymidi -p 130:0 ~/path/to/midi.mid vmpk was highlighting notes on the piano as if it were playing the midi. One time I tried this, TiMidity (?) very briefly played a fraction of a second of the first chord of my song before everything went silent and vmpk just highlighted the first voice on the keyboard as usual. Now the weirdest part of this is that probably about 40% of the time, when I've played at least one note with either aplaymidi or vmpk, when I run aconnect -x I get a sudden burst of a note or chord from my speakers (that is, if I played one note, I get a note; if I played multiple sequential notes, they turn into a chord), as if the notes were being queued up but not being played and that somehow liberated them. I have no idea what's going on there. A little while ago I remember having a problem with Audacity playing wav files sped up and also locking up if I tried to pause it, which it stopped doing when I set the audio devices to the actual audio devices rather than pulse. But now when I checked again, it's doing the opposite: it won't play audio at all and/or acts weirdly if I don't set the audio devices to pulse, and either way will very occasionally randomly do the speeding up thing regardless. Oddly in the midst of what's looking like a pretty screwed up sound system, sound in VLC and Firefox has been working fine and if I play a wav file with aplay ~/path/to/sound.wav that works fine too. Any idea what I could do to figure out what's wrong with ALSA and/or fix it?

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• how to make a continuous machine gun sound-effect

  - by Jan

  I am trying to make an entity fire one or more machine-guns. For each gun I store the time between shots (1.0 / firing rate) and the time since the last shot. Also I've loaded ~10 different gun-shot sound-effects. Now, for each gun I do the following: function update(deltatime): timeSinceLastShot += deltatime if timeSinceLastShot >= timeBetweenShots + verySmallRandomValue(): timeSinceLastShot -= timeBetweenShots if gunIsFiring: displayMuzzleFlash() spawnBullet() selectRandomSound().play() But now I often get a crackling noise (which I assume is when two or more guns are firing at the same time and confuse the sound-device). My question is whether A) This a common problem and there is a well-known solution, maybe to do with the channels or something, or B) I am using a completely wrong approach to the task. I had a look at some sound-assets for other games and they used complete burst with multiple shots. I suppose I could try that, but I would like to have organic little hickups in the gun-fire (that's what the random value is for) to make the game more gritty and dirty. I am using Panda3D, but I had the exact same problem in PyGame and SDL. [edit] Thanks a lot for the answers so far! One more problem with faking it though: Now how do I stop the sound? Let's say I have an effect with 5 bangs... *bang* *bang* *bang* *bang* *bang* And I magically manage to loop it so that there's no gap or overlap if the player fires more than 5 shots. Now, what do I do if the player stops firing halfway through the third bang? How do I know how long to keep playing the sample so that the third bang is completed and I can start playing the rumbling echo of the last shot? Of course I can look up the shot/pause timing of that sound-sample and code accordingly, but it feels extremely hacky.

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• XNA model drawing problem

  - by user1990950

  When using this code: public static void DrawModel(Model model, Vector3 position, Vector3 offset, float xRotation, float yRotation, float zRotation, float allrot, float xScale, float yScale, float zScale) { position.Y *= -1; offset.Y *= -1; Matrix worldMatrix = ((Matrix.CreateRotationZ(MathHelper.ToRadians(zRotation)) * Matrix.CreateRotationX(MathHelper.ToRadians(xRotation))) * Matrix.CreateRotationY(MathHelper.ToRadians(yRotation))) * (Matrix.CreateTranslation(offset) * Matrix.CreateRotationY(MathHelper.ToRadians(allrot))) * Matrix.CreateScale(xScale, yScale, zScale); worldMatrix *= Matrix.CreateTranslation(position) * theCamera.GetTransformation() * Matrix.CreateTranslation(new Vector3(-(graphics.GraphicsDevice.Viewport.Width / 2), graphics.GraphicsDevice.Viewport.Height / 2, 0)); foreach (ModelMesh mesh in model.Meshes) { for (int i = 0; i < mesh.Effects.Count; i++) { ((BasicEffect)mesh.Effects[i]).EnableDefaultLighting(); ((BasicEffect)mesh.Effects[i]).World = worldMatrix; ((BasicEffect)mesh.Effects[i]).View = viewMatrix; ((BasicEffect)mesh.Effects[i]).Projection = projectionMatrix; } mesh.Draw(); } } The model rotates and then scales. It should scale and then rotate, but whenever I try to change it, it won't work.

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• Update fails to Install

  - by FirmTech

  I get the below error when I try to install updates using Software Updater: Not enough free disk space The upgrade needs a total of 81.3 M free space on disk '/boot'. Please free at least an additional 15.9 M of disk space on '/boot'. Empty your trash and remove temporary packages of former installations using 'sudo apt-get clean'. What should I do? firmtechnologies@FirmTechnologies:~$ (ls -l /boot) total 155801 -rw-r--r-- 1 root root 1158016 May 3 01:30 abi-3.13.0-24-generic -rw-r--r-- 1 root root 1161713 May 8 01:31 abi-3.13.0-26-generic -rw-r--r-- 1 root root 1161713 May 15 20:07 abi-3.13.0-27-generic -rw-r--r-- 1 root root 1161764 Jun 4 22:57 abi-3.13.0-29-generic -rw-r--r-- 1 root root 165510 May 3 01:30 config-3.13.0-24-generic -rw-r--r-- 1 root root 165538 May 8 01:31 config-3.13.0-26-generic -rw-r--r-- 1 root root 165521 May 15 20:07 config-3.13.0-27-generic -rw-r--r-- 1 root root 165544 Jun 4 22:57 config-3.13.0-29-generic drwxr-xr-x 5 root root 1024 Jun 6 14:31 grub -rw-r--r-- 1 root root 29091568 May 7 21:31 initrd.img-3.13.0-24-generic -rw-r--r-- 1 root root 29094684 May 12 12:24 initrd.img-3.13.0-26-generic -rw-r--r-- 1 root root 29095678 May 18 10:57 initrd.img-3.13.0-27-generic -rw-r--r-- 1 root root 29093700 Jun 6 14:32 initrd.img-3.13.0-29-generic drwx------ 2 root root 12288 Apr 30 17:11 lost+found -rw-r--r-- 1 root root 176500 Mar 12 13:31 memtest86+.bin -rw-r--r-- 1 root root 178176 Mar 12 13:31 memtest86+.elf -rw-r--r-- 1 root root 178680 Mar 12 13:31 memtest86+_multiboot.bin -rw------- 1 root root 3372643 May 3 01:30 System.map-3.13.0-24-generic -rw------- 1 root root 3377429 May 8 01:31 System.map-3.13.0-26-generic -rw------- 1 root root 3377429 May 15 20:07 System.map-3.13.0-27-generic -rw------- 1 root root 3378267 Jun 4 22:57 System.map-3.13.0-29-generic -rw------- 1 root root 5776416 May 3 01:30 vmlinuz-3.13.0-24-generic -rw------- 1 root root 5790912 May 8 01:30 vmlinuz-3.13.0-26-generic -rw------- 1 root root 5790912 May 15 20:07 vmlinuz-3.13.0-27-generic -rw------- 1 root root 5792544 Jun 4 22:57 vmlinuz-3.13.0-29-generic

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• Why doesn't unity show icons or panel after installing numix theme?

  - by Sid

  I'm a beginner to Ubuntu/Linux and I have a problem: Unity is not loading! When I choose Unity in the log-in screen, I get notifications and I can see the mouse, but that's it. I have Ubuntu 14.04 installed, along with Bumblebee/Primus. I had no issues whatsoever, until I decided to try the numix-theme and the numix icon pack. I added the PPA and installed it, but when I logged off and logged back on, nothing showed up. I panicked, and in tty1, I purged numix-* but that did not solve the issue. To get by day-to-day use, I installed gnome-flashback, and among those environments, only the metacity one works. (The compiz one does not.) I've tried installing the unity-tweak-tool to reset unit, installing dconf and doing: dconf reset -f /org/compiz/ but that didn't work either. One site even told me to delete /org/compiz/, but that did not resolve the issue. When I checked ccsm, the Unity plugin had a check to it. I also tried with Unity doesn't load, no Launcher, no Dash appears, but it gets stuck on "loading icons". Any help will be awesome!

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• Commands don't have permission when using absplute path

  - by Markos

  I have folders set up this way: /srv/samba/video getfacl /srv/samba/video # file: srv/samba/video # owner: root # group: nogroup user::rwx group::--- group:sambaclients:rwx group:deluge:rwx mask::rwx other::--- default:user::rwx default:group::--- default:group:sambaclients:rwx default:group:deluge:rwx default:mask::rwx default:other::--- That means, user deluge has rwx to folder /srv/samba/video. However, when running command as user deluge, I am getting weird permission errors. When in folder /srv/samba/video: sudo -u deluge mkdir foo works flawlessly. But when using absolute path: sudo -u deluge mkdir /srv/samba/video/foo I am getting permission denied. When running sudo -u deluge id, I get output uid=113(deluge) gid=124(deluge) skupiny=124(deluge) which shows that user deluge is indeed in group deluge. Also, the behavior was the same when I gave the permissions also to user deluge not just group deluge. When executing as non-system user, it does work. The reason that I want to use absolute paths is that I am using automatically triggered post-download script which extracts some files into the folder. I have spent way too many hours to solve this problem myself. mkdir isn't the only command that fails, touch is doing the same thing, so I suspect that it's not mkdir's fault. If you need more info, I will try to put it in here, just ask. Thanx in advance.

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• VMware Kernel Module Updater hangs on Ubuntu 13.04

  VMware Player has a nice auto-detection of kernel changes, and requests the user to compile the required modules in order to load them. This happens from time to time after a regular update of your system. Usually, the dialog of VMware Kernel Module Updater pops up, asks for root access authentication, and completes the compilation. VMware Player or Workstation checks if modules for the active kernel are available. In theory this is supposed to work flawlessly but in reality there are pitfalls occassionally. With the recent upgrade to Ubuntu 13.04 Raring Ringtail and the latest kernel 3.8.0-21 the actual VMware Kernel Module Updater simply disappeared and the application wouldn't start as expected. When you launch VMware Player as super user (root) the dialog would stall like so: VMware Kernel Module Updater stalls while stopping the services Prior to version 5.x of VMware Player or version 7.x of VMware Workstation you would run a command like: $ sudo vmware-config.pl to resolve the module version conflict but this doesn't work anyway. Solution Instead, you have to execute the following line in a terminal or console window: $ sudo vmware-modconfig --console --install-all Those switches are (as of writing this article) not documented in the output of the --help switch. But VMware already documented this procedure in their knowledge base: VMware Workstation stops functioning after updating the kernel on a Linux host (1002411). Update As of today I had the first kernel upgrade to version 3.8.0-22 in Ubuntu 13.04. Don't even try it without vmware-modconfig...

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• Problem graphics with ATI Radeon x1270 (RS690M) on Ubuntu 12.04

  - by Giuseppe Della Corte

  I'm Italian and so I apologize for my English! I'm a beginner to Ubuntu and I tried it on my desktop PC and it's fantastic, fast and fun! I decided to try it on my netbook Packard Bell DOT M/A and this is the configuration: AMD Athlon L110 1.2GHz 2GB of RAM ATI Radeon x1270 (RS690M) 150GB Hard Disk I installed Ubuntu 12.04 with Wubi (dualboot Windows 7 + Ubuntu 12.04), because the netbook does not have a DVD player! During the installation everything is OK, after it was installed I see mistakes in the graphical display! I see objects that are seen in different colors and moving (buttons, mouse pointer, text bar ... etc ...) At one point came not to see anything, such as this screenshot: The drivers are open, that is already installed in Ubuntu. Windows 7 video card runs fine, can run well Aero (transparent window effects), I can watch movies in HD and play some games with the Catalyst drivers from AMD. Now I ask a favor, you can help me solve this problem? Is there a fix for this driver or drivers different on the Internet? Thanks for your attention, good bye!

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• apt-get update stuck on "Waiting for Headers"

  - by crasic

  I'm setting up a Maverick server on a spare PC. The install completes fine and the system boots up into the shell. However, when I try to do a apt-get update , apt hangs on almost every entry with the message 99% [Waiting for headers] sometimes a message of 96 b/s appears on the far right. The actual percent that it claims also varies. Searching around online gave a potential solution by using the option Acquire::http::Pipeline-Depth="0" this somewhat alleviates the problem, i.e. it stalls on every other entry with the same message as above. If you wait it out (the whole update took about 4 hours), the update still fails as a good portion of the hits show a "unable to connect" or similar message, despite the fact that I can ping the server from the pc just fine. The problem is also unrelated to the mirror used since I've tried about a dozen mirrors with no success, I've even tried commenting out everything but the main entry in sources.list and it still refuses to update. The network connection is fine since I can ping and wget (apt won't let me install lynx until I run a successful update) just fine. I've also reinstalled the distro with no luck. The only thing weird about the setup is that the PC is connecting to the internet through my windows laptop with ICS configured properly, but as I've said before, the network connection is fine.

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• Baseline for GIS Applications

  - by Geertjan

  The application I introduced here yesterday can best be understood via its author's explanation: "As I developed several different WorldWind-based applications, I noticed that they all started out the same. Terramenta was born so I wouldn't have to recreate the baseline every time, I could just provide NetBeans plugin modules to introduce the new features required by different projects." So, to try it out for myself, I checked out the sources from the Mercurial repo today, built them, and ran them. hg clone https://bitbucket.org/heidtmare/terramenta On Windows, things worked fine, on Ubuntu they didn't because the relevant native libraries aren't provided yet out of the box. Here's the result: The above provides the WorldWind globe, together with all the standard options, e.g., for showing names and other WorldWind features, together with several features that I don't understand yet, such as tools for creating shapes and a recorder for replaying sequences. The complete application is like this, i.e., one single functionality module is provided, which exposes several API packages that can be extended: It would really be cool if the above module could also be added to a Maven-based application via a reference to a Maven repository, in the way that Timon Veenstra and the AgroSense team have made available their GeoViewer. One cool thing from the GeoViewer solution is the Flamingo menubar, which I added to Terramenta by simply putting the dependency below into the application POM: <dependency>    <groupId>nl.cloudfarming.client</groupId>    <artifactId>menu</artifactId>    <version>1.0.24</version></dependency> The result, without doing anything other than the above: I am looking forward to helping to document the use cases and developer scenarios for Terramenta! Something like this, created by Timon to demonstrate the GeoViewer use case would be cool to have: http://java.net/projects/agrosense/pages/ExampleGeoviewerNormal

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• Choppy USB mice on just one of USB ports

  - by user20532

  I've got Lenovo b560 laptop with latest, properly updated Kubuntu on it (11.04 natty, kernel 2.6.38-8-generic). It has three USB2.0 ports onboard. I usually plug a mouse into one of them (I've got 3 different mice - in office, at home and for when on the go). Sometimes, usually after laptop awakening from sleep, the mouse still works but cursor movements are choppy, as if the processor was extremely loaded (it's usually not). I found that if I re-plug the mouse cord into the other USB port, it works just fine. If I plug it back to problematic port, it is still choppy and remains choppy until next boot. Of course I want my mice to always work fine. Problem is: I cannot reproduce this behavior for sure, it happens sporadically but regularly. I use different USB ports (problem has ever happened on each of them since), I use different mice (each has failed me this way at least once), I cannot generally find what exactly is going wrong and why plugging to different port fixes the mouse instantly. So I'd like to hear at least clues where to look at, what to try to identify my problem. A bit of update: while beginning this post, I had the issue once again. I have just replugged the mouse back to problematic port and it is not recognized at all. On the other port it works smoothly.

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• Java SE 8 (with JavaFX) Developer Preview Release for ARM

  - by Roger Brinkley

  In an effort to get ARM developers testing Java SE 8 before the scheduled release later this year a Java SE 8 Developer Preview Release for ARM has been made available. This release has been tested on the Raspberry PI but should work on other ARM platforms. In addition to the new Java SE features, this release provides specific support of hard float GPU on the Raspberry PI. The support for hard float GPU has been anticipated by a number of developers. Additionally, this release includes support of an optimized JavaFX. Specific configurations of JDK 8 on ARM are defined below: Java FX is supported on ARM architecture v6/7 (hard float) Supported platforms without Java FX: ARM architecture v6/7 (hard float) ARM architecture v7 (VFP, little endian) ARM architecture v5 (soft float, little endian) Linux x86 The download page includes setup instructions for a Raspberry PI device as well as demos and samples. Developers are also encouraged to try their own applications as well and to share their stories via the JavaFX or Project Feedback Forums.  If you've got a Raspberry PI or other ARM devices it's time to get started with Java SE 8 Developer Preview release.

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• team viewer 8 beta wont run

  - by Conner Jones

  I installed team viewer 7 and then one of my friends using windows got version 8 so I installed the beta of version 8 for linux. When I try to run it for terminal I get these errors i atempted to do as the comment bellow said and when trying to run teamveiwer i stil got an error conner@DemonicGrace:~$ teamviewer Init... Checking setup... Launching TeamViewer... wine: cannot find L"C:\windows\system32\winemenubuilder.exe" err:wineboot:ProcessRunKeys Error running cmd L"C:\windows\system32\winemenubuilder.exe -a -r" (2) err:winedevice:ServiceMain driver L"MountMgr" failed to load err:secur32:SECUR32_initSchannelSP libgnutls not found, SSL connections will fail fixme:heap:HeapSetInformation (nil) 1 (nil) 0 fixme:ole:CoInitializeSecurity ((nil),-1,(nil),(nil),0,3,(nil),0,(nil)) - stub! fixme:heap:HeapSetInformation (nil) 1 (nil) 0 fixme:process:SetProcessShutdownParameters (00000100, 00000000): partial stub. fixme:resource:GetGuiResources (0xffffffff,0): stub fixme:win:EnumDisplayDevicesW ((null),0,0x32df64,0x00000000), stub! fixme:win:EnumDisplayDevicesW (L"\\.\DISPLAY1",0,0x32dc1c,0x00000000), stub! fixme:win:EnumDisplayDevicesW ((null),1,0x32df64,0x00000000), stub! please help me out if anyone has ideas im more than willing to listen

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• How do I find add-ons for packages when using the command line?

  - by user74660

  My question is a little bit different from others already asked, I guess. I've already searched for answers, but I didn't find anything related. For example, I've always installed K3B via Terminal with the following command "sudo apt-get install k3b". It always worked, of course. One day, I decided to install it via Ubuntu Sofware Center and, to my surprise, there were a few Add-ons I didn't know about. I checked some of them to be installed as well because I found them useful. Now, here's my question: When we try to install a software via Terminal and this software has add-ons, how do we know that? And how do we install the add-ons via Terminal? I suppose we have to know the names of the add-ons first, and then install them one by one, once the main software has already been installed. But how do we get to know those names via Terminal? Using the Software Center is cool because it shows the add-ons, a brief description for each one and their names in brackets, right? How about that via Terminal? I had never paid attention to this until I used the Software Center. By the way, K3B was just an example, of course.

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• Abstract Factory Method and Polymorphism

  - by Scotty C.

  Being a PHP programmer for the last couple of years, I'm just starting to get into advanced programming styles and using polymorphic patterns. I was watching a video on polymorphism the other day, and the guy giving the lecture said that if at all possible, you should get rid of if statements in your code, and that a switch is almost always a sign that polymorphism is needed. At this point I was quite inspired and immediately went off to try out these new concepts, so I decided to make a small caching module using a factory method. Of course the very first thing I have to do is create a switch to decide what file encoding to choose. DANG! class Main { public static function methodA($parameter='') { switch ($parameter) { case 'a': $object = new \name\space\object1(); break; case 'b': $object = new \name\space\object2(); break; case 'c': $object = new \name\space\object3(); break; default: $object = new \name\space\object1(); } return (sekretInterface $object); } } At this point I'm not really sure what to do. As far as I can tell, I either have to use a different pattern and have separate methods for each object instance, or accept that a switch is necessary to "switch" between them. What do you guys think?

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• Does unit testing lead to premature generalization (specifically in the context of C++)?

  - by Martin

  Preliminary notes I'll not go into the distinction of the different kinds of test there are, there are already a few questions on these sites regarding that. I'll take what's there and that says: unit testing in the sense of "testing the smallest isolatable unit of an application" from which this question actually derives The isolation problem What is the smallest isolatable unit of a program. Well, as I see it, it (highly?) depends on what language you are coding in. Micheal Feathers talks about the concept of a seam: [WEwLC, p31] A seam is a place where you can alter behavior in your program without editing in that place. And without going into the details, I understand a seam -- in the context of unit testing -- to be a place in a program where your "test" can interface with your "unit". Examples Unit test -- especially in C++ -- require from the code under test to add more seams that would be strictly called for for a given problem. Example: Adding a virtual interface where non-virtual implementation would have been sufficient Splitting -- generalizing(?) -- a (smallish) class further "just" to facilitate adding a test. Splitting a single-executable project into seemingly "independent" libs, "just" to facilitate compiling them independently for the tests. The question I'll try a few versions that hopefully ask about the same point: Is the way that Unit Tests require one to structure an application's code "only" beneficial for the unit tests or is it actually beneficial to the applications structure. Is the generalization code need to exhibit to be unit-testable useful for anything but the unit tests? Does adding unit tests force one to generalize unnecessarily? Is the shape unit tests force on code "always" also a good shape for the code in general as seen from the problem domain? I remember a rule of thumb that said don't generalize until you need to / until there's a second place that uses the code. With Unit Tests, there's always a second place that uses the code -- namely the unit test. So is this reason enough to generalize?

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• Ubuntuone promting that my account is full, but its not....

  - by Andreas

  My Ubuntuone is prompting that my account is full. It has done that for over a week now, but its the account is not full at all... I have tried this guide: 1 down vote Can you please try the following: Quit the Ubuntu One Preferences, if open Open (Lucid): Applications-Accessories-Passwords and Encryption Keys (Maverick): System - Preferences - Password and Encryption Keys Click on the arrow next to "Passwords" Right-click on the Ubuntu One token and select "Delete" Go to https://one.ubuntu.com/account/machines/ Click on the checkbox next to your computer Click the "Remove selected computers" button (Maverick): killall ubuntu-sso-login; u1sdtool -q; u1sdtool -c (Lucid): u1sdtool -q; killall ubuntuone-login; u1sdtool -c a web page, if in Lucid, or a window, in Maverick, should open,prompting you to add your computer to your Ubuntu One account Add your computer This guide did not change any thing and i still get prompted that my account is full every time something is syncing. I also tried to create and connect to a new account butt still... the new account was doing the same. So I am now relay confused, pleas help!

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• C++ Windows Forms application unhandled exception error when textbox empty

  - by cmorris1441

  I'm building a temperature conversion application in Visual Studio for a C++ course. It's a Windows Forms application and the code that I've written is below. There's other code to of course, but I'm not sure you need it to help me. My problem is, when I run the application if I don't have anything entered into either the txtFahrenheit or txtCelsius2 textboxes I get the following error: "An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll" The application only works right now when a number is entered into both of the textboxes. I was told to try and use this: Double::TryParse() but I'm brand new to C++ and can't figure out how to use it, even after checking the MSDN library. Here's my code: private: System::Void btnFtoC_Click(System::Object^ sender, System::EventArgs^ e) { // Convert the input in the Fahrenheit textbox to a double datatype named fahrenheit for manipulation double fahrenheit = Convert::ToDouble(txtFahrenheit->Text); // Set the result string to F * (5/9) -32 double result = fahrenheit * .5556 - 32; // Set the Celsius text box to display the result string txtCelsius->Text = result.ToString(); } private: System::Void btnCtoF_Click(System::Object^ sender, System::EventArgs^ e) { // Convert the input in the Celsius textbox to a double datatype name celsius for manipulation double celsius = Convert::ToDouble(txtCelsius2->Text); // Set the result2 string to C * (9/5) + 32 double result2 = celsius * 1.8 + 32; // Set the Fahrenheit text box to display the result2 string txtFahrenheit2->Text = result2.ToString(); }

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• How to Extract the images from the doc file without Having Microsoft office ?

  - by Anirudha

  Originally posted on: http://geekswithblogs.net/anirugu/archive/2013/06/29/how-to-extract-the-images-from-the-doc-file-without.aspxMany time we got the doc file who have some images. We need to try to extract them in Microsoft word which come with Windows 7 (not Microsoft office word). Looking to this article http://www.techrepublic.com/blog/itdojo/save-images-in-microsoft-word-documents-as-separate-files/135 This article is only useful when you have Microsoft word installed. Now if I don’t have Microsoft office then what ? No problem, here is a trick. when you open the doc file in Word  then select the image and right click on image and choose cut. open the Microsoft paint. paste them here. Without clicking anywhere click on crop icon on toolbar.   Now you got your image in the same size as you have in word file. Don’t worry about Image format. Microsoft paint have support for save them in PNG format.

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• Developing wheel reinventing tendencies into a skill as opposed to reluctantly learning wheel-finding skills? [duplicate]

  - by Korey Hinton

  This question already has an answer here: Is reinventing the wheel really all that bad? 20 answers I am more of a high-level wheel reinventor. I definitely prefer to make use of existing API features built into a language and popular third-party frameworks that I know can solve the problem, however when I have a particular problem that I feel capable of solving within a reasonable time I am very reluctant to find someone else's solution. Here are a few reasons why I reinvent: It takes time to learn a new API API restrictions might exist that I don't know about Avoiding re-work of unfamiliar code I am conflicted between doing what I know and shifting to a new technique I don't feel comfortable with. On one hand I feel like following my instincts and getting really good at solving problems, especially ones that I would never challenge myself with if all I did was try to find answers. And on the other hand I feel like I might be missing out on important skills like saving time by finding the right framework and expanding my knowledge by learning how to use a new framework. I guess my question comes down to this: My current attitude is to stick to the built-in API and APIs I know well* and to not spend my time searching github for a solution to a problem I know I can solve myself within a reasonable amount of time. Is that a reasonable balance for a successful programmer? *Obviously I will still look around for new frameworks that save time and solve/simplify difficult problems.

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• Memory limiting solutions for greedy applications that can crash OS?

  - by Hooked

  I use my computer for scientific programming. It has a healthy 8GB of RAM and 12GB of swap space. Often, as my problems have gotten larger, I exceed all of the available RAM. Rather than crashing (which would be preferred), it seems Ubuntu starts loading everything into swap, including Unity and any open terminals. If I don't catch a run-away program in time, there is nothing I can do but wait - it takes 4-5 minutes to switch to a command prompt eg. Ctrl-Alt-F2 where I can kill the offending process. Since my own stupidity is out of scope of this forum, how can I prevent Ubuntu from crashing via thrashing when I use up all of the available memory from a single offending program? At-home experiment*! Open a terminal, launch python and if you have numpy installed try this: >>> import numpy >>> [numpy.zeros((10**4, 10**4)) for _ in xrange(50)] * Warning: may have adverse effects, monitor the process via iotop or top to kill it in time. If not, I'll see you after your reboot.

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• Is there any place to find real-world usage-style tutorials for programming languages?

  - by OleDid

  Let's face it. When you want to learn something completely new, be it mathematics or foreign languages, it's easiest to learn when you get real world scenarios in front of you, with theory applied. For example, trigonometry can be extremely interesting when applied to creation of 2D platform games. Norwegian can be really interesting to learn if you live in Norway. When I try to look at a new programming language, I always find these steps the hardest: What tools do I need to compile and how do I do it Introduction-step: Why is this programming language so cool? Where and how is it used? (The step I am looking for, real-world scenarios) The rest, deep diving into the language, pure theory and such, is often much easier if you have completed step 1 and 2. Because now you know what it's all about, and can just read the specification when you need to. What I ask is, do you have any recommendations for places I can find such material for programming languages? Be it websites or companies selling books in this style, I'm interested. Also, I am interested in all languages. (If I had found a "real-world usage" explained for even INTERCAL, I would be interested). In some other thread here, I found a book called "Seven Languages in Seven Weeks". This is kind of what I am looking for, but I believe there must be "more like this".

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