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  • Programming language features that help to catch bugs early

    - by Christian Neumanns
    Do you know any programming language features that help to detect bugs early in the software development process - ideally at compile-time or else as early as possible at run-time? Examples of well-known and effective bug-reducing features are: Static typing and generic types: type incompatibility errors are detected by the compiler Design by Contract (TM), also called Contract Programming: invalid values are quickly detected at runtime (through preconditions, postconditions and class invariants) Unit testing I ask this question in the context of improving an object-oriented programming language (called Obix) which has been designed from the ground up to 'make it easy to quickly write reliable code'. Besides the features mentioned above this language also incorporates other Fail-fast features such as: Objects are immutable by default Void (null) values are not allowed by default The aim is to add more Fail-fast concepts to the language. If you know other features which help to write less error-prone code then please let us know. Thank you.

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  • My computer stops seeing the other computers on my network

    - by dan
    I'm running Ubuntu 11.04. Sometimes my computer stops seeing the names of the other computers on my network. So I can no longer log into another computer by typing the hosting name e.g. ssh [email protected] I can still log in using the local network IP address. How can I get the first way to work again without rebooting? I know this problem is local to the computer. The other computers on my network can still see one another. But they can no longer see the computer I'm working on, not even by local ip address.

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  • Kubuntu login problem

    - by Balázs Mária Németh
    I have a problem when trying to login to my Kubuntu 10.10. The login screen shows up, then I type my password, a blank screen is shown with my desktop background picture and then throws me back on the login screen. if I choose to login from console, I can do that, and by typing startx I can log in just fine but in the end I cannot shutdown the computer from the k menu nor will my settings remembered for the next time I log back. I have my home directory mounted from a different partition but I tried to create a new user account and I could log in without any kind of problem. The home directory is not encrypted, at least not to my knowledge. Some log files: Xorg.0.log dmesg.out kdm.log xsession.errors

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  • How can I solve display glitches and poor performance with ATI fglrx driver on my ThinkPad X100e?

    - by rewbs
    I noticed that video performance on my Thinkpad X100e was very poor compared to Windows 7, so I installed the ATI fglrx proprietary drivers by using the "Additional Drivers" dialogue box. The system has an ATI Radeon Mobility HD 3200 chip. The result of installing the drivers is pretty devastatingly negative, with symptoms such as skewed content in windows, browser tabs and text boxes failing to refresh when their content changes. In fact, please excuse typos in this post, because I can't really see what I am typing. :) I also notice that HD video playback performance is no better - perhaps even worse - than prior to installing the drivers. Example of what I see: Here's the output of fglrxinfo: display: :0.0 screen: 0 OpenGL vendor string: ATI Technologies Inc. OpenGL renderer string: ATI Radeon HD 3200 Graphics OpenGL version string: 3.3.10237 Compatibility Profile Context Output of lspci | grep -i vga: 01:05.0 VGA compatible controller: ATI Technologies Inc RS780M/RS780MN [Radeon HD 3200 Graphics] I'm on Ubuntu 10.10 with kernel 2.6.35-22-generic-pae. What can I try? Many thanks, -R

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  • How to make unity unresponsive in Unity session in precise?

    - by Anwar Shah
    Recently I wanted to test the a keyboard shortcut, which is supposed to kill X server (hence very useful when you have a crash). That shortcut is not dependent on any particular window manager (like lxde, unity, kwin etc). So, it must work, even when you have unresponsive window manager (as opposed to Alt+Ctrl+Backspace which kills the session, and bring you a login screen). That's why I interested to make my WM (unity) unresponsive. Is past, it was very easy. Opening a terminal, typing unity --replace and then force close the terminal, was the simplest procedure. But unfortunately, This is not true in Ubuntu 12.04, (they make it very robust) Because whenever I kill the terminal, Unity automagically restart itself. I also tried compiz --replace but wasn't successful. My question is: How can I make Unity unresponsive while I am in Unity session, so that window manager does not recognize any keyboard shortcut.

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  • Touchpad not working on HP DV4 notebook

    - by Blaze
    the touchpad doesn't respond at all. i had to use an external usb mouse even to install ubuntu. I dont know the name of the manufacturer too. i am a newbie to ubuntu. i checked many related answers but they didnt help some are: sudo rmmod psmouse sudo modprobe psmouse proto=imps i used deconf editor_ in that it shows that touchpad is enabled but nothing haapens. i tried changing the setting 'disable while typing' that didn't work either. please help me. i really want to use ubuntu as i find it really good but without touchpad it would be pointless. literally.

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  • Custom Configuration Section Handlers

    Most .NET developers who need to store something in configuration tend to use appSettings for this purpose, in my experience.  More recently, the framework itself has helped things by adding the <connectionStrings /> section so at least these are in their own section and not adding to the appSettings clutter that pollutes most apps.  I recommend avoiding appSettings for several reasons.  In addition to those listed there, I would add that strong typing and validation are additional reasons to go the custom configuration section route. For my ASP.NET Tips and Tricks talk, I use the following example, which is a simple DemoSettings class that includes two fields.  The first is an integer representing how many attendees there are present for the talk, and the second is the title of the talk.  The setup in web.config is as follows: <configSections> <section name="DemoSettings" type="ASPNETTipsAndTricks.Code.DemoSettings" /> </configSections>   <DemoSettings sessionAttendees="100" title="ASP.NET Tips and Tricks DevConnections Spring 2010" /> Referencing the values in code is strongly typed and straightforward.  Here I have a page that exposes two properties which internally get their values from the configuration section handler: public partial class CustomConfig1 : System.Web.UI.Page { public string SessionTitle { get { return DemoSettings.Settings.Title; } } public int SessionAttendees { get { return DemoSettings.Settings.SessionAttendees; } } } Note that the settings are only read from the config file once after that they are cached so there is no need to be concerned about excessive file access. Now weve seen how to set it up on the config file and how to refer to the settings in code.  All that remains is to see the file itself: public class DemoSettings : ConfigurationSection { private static DemoSettings settings = ConfigurationManager.GetSection("DemoSettings") as DemoSettings; public static DemoSettings Settings{ get { return settings;} }   [ConfigurationProperty("sessionAttendees" , DefaultValue = 200 , IsRequired = false)] [IntegerValidator(MinValue = 1 , MaxValue = 10000)] public int SessionAttendees { get { return (int)this["sessionAttendees"]; } set { this["sessionAttendees"] = value; } }   [ConfigurationProperty("title" , IsRequired = true)] [StringValidator(InvalidCharacters = "~!@#$%^&*()[]{}/;\"|\\")] public string Title { get { return (string)this["title"]; } set { this["title"] = value; }   } } The class is pretty straightforward, but there are some important components to note.  First, it must inherit from System.Configuration.ConfigurationSection.  Next, as a convention I like to have a static settings member that is responsible for pulling out the section when the class is first referenced, and further to expose this collection via a static readonly property, Settings.  Note that the types of both of these are the type of my class, DemoSettings. The properties of the class, SessionAttendees and Title, should map to the attributes of the config element in the XML file.  The [ConfigurationProperty] attribute allows you to map the attribute name to the property name (thus using both XML standard naming conventions and C# naming conventions).  In addition, you can specify a default value to use if nothing is specified in the config file, and whether or not the setting must be provided (IsRequired).  If it is required, then it doesnt make sense to include a default value. Beyond defaults and required, you can specify more advanced validation rules for the configuration values using additional C# attributes, such as [IntegerValidator] and [StringValidator].  Using these, you can declaratively specify that your configuration values be in a given range, or omit certain forbidden characters, for instance.  Of course you can write your own custom validation attributes, and there are others specified in System.Configuration. Individual sections can also be loaded from separate files, using syntax like this: <DemoSettings configSource="demosettings.config" /> Summary Using a custom configuration section handler is not hard.  If your application or component requires configuration, I recommend creating a custom configuration handler dedicated to your app or component.  Doing so will reduce the clutter in appSettings, will provide you with strong typing and validation, and will make it much easier for other developers or system administrators to locate and understand the various configuration values that are necessary for a given application. Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Disable plugin in Firefox (acroread)

    - by cboettig
    I installed acroread from the repositories, and it has decided it should be the default plugin in Firefox, such that when I click on a pdf, it opens in a Firefox window. Unfortunately, it does not display (at least when in dual head mode). This should be simple, but I cannot disable the plugin. Under Firefox Edit - Preferences- Applications - pdf is set to "always ask" so I don't know why it uses acroread in the first place. Under Tools - Manage Content Plugins I see acroread is selected for pdf content. I have the option in the dropdown to search for a new plugin, but not to simply download the file. Typing about:config into the Firefox toolbar gives me a list of configuration options, but does not mention plugin.disable or acroread anywhere. How do I disable the plugin? I have Firefox 11.0 on Ubuntu 11.10

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  • A weekend with the Samsung Galaxy Tab

    - by Richard Mitchell
    This weekend I took one of the Samsung Galaxy Tabs we have lying around the office here home to see how I got on with it as I've been thinking of buying one. Initial impressions The look and feel of the Tab is quite nice. It's a lot smaller than an iPad but that is no bad thing as I imagine they are targeted at different markets. The Tab fits into my inside coat pocket nicely and doesn't feel like it's weighing me down too much. Connecting up the Tab to the network at work was fine, typing in...(read more)

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  • Add Reference with Search

    - by Daniel Cazzulino
    If you have been using VS2010 for any significant amount of time, you surely came across the awkward, slow and hard to use Add Reference dialog. Despite some (apparent) improvements over the VS2008 behavior, in its current form it's even LESS usable than before. A brief non-exhaustive summary of the typical grief with this dialog is: Scrolling a list of *hundreds* of entries? (300+ typically) No partial matching when typing: yes, you can type in the list to get to the desired entry, but the matching is performed in an exact manner, from the beginning of the assembly name. So, to get to the (say) "Microsoft.VisualStudio.Settings" assembly, you actually have to type the first two segments in their entirety before starting to type "Settings"....Read full article

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  • Maximized Office 2007 gets cut off on multi-monitor setup with different resolutions

    - by Adam M-W
    I've got an external monitor plugged into my laptop that I like to use for typing up documents, but I've noticed that when Word is maximized it gets cut off at where the primary monitor's bounds are. Is this a bug in Wine (i'm using version 1.3.32), or with my Window Manager (metacity with compositing enabled, version 2.34.1), with my graphics drivers (nouveau) or something else? I know that I can fix it by unmaximizing (it doesn't get cut off and I can resize to the entirety of the second monitor), but it keeps on maximizing itself as it (rightly so) knows that it should be taking up the entire screen. I don't really want to use the "Emulate a virtual desktop feature", I would prefer to find the source of this issue.

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  • Filezilla Install Problem: Hash Sum Mismatch

    - by kyleskool
    I'm new to the Ubuntu scene, and I tried to install Filezilla today by going to terminal and typing "sudo apt-get install filezilla", and got this error: Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/universe/w/wxwidgets2.8/libwxbase2.8-0_2.8.12.1-6ubuntu2_amd64.deb Hash Sum mismatch Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/universe/w/wxwidgets2.8/libwxgtk2.8-0_2.8.12.1-6ubuntu2_amd64.deb Hash Sum mismatch Failed to fetch http://universe/t/tinyxml/libtinyxml2.6.2_2.6.2-1build1_amd64.deb Hash Sum mismatch Failed to fetch http://universe/f/filezilla/filezilla-common_3.5.3-1ubuntu2_all.deb Hash Sum mismatch Failed to fetch http://universe/f/filezilla/filezilla_3.5.3-1ubuntu2_amd64.deb Hash Sum mismatch E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? Running it again with "--fix-missing" appended to the command didn't work, nor did running apt-get update. Any suggestion? Thanks!

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  • Need Japanese IME with Dvorak keyboard with 13.10

    - by user916792
    I recently did a fresh install of 13.10 and enabled Japanese language support. In the past this seemed to work seamlessly with my other keyboard settings when I set up my Dvorak keyboard. But this time when I toggle the IME on it uses the standard QWERTY layout. Typing English uses the Dvorak layout as I expect. This just worked for me in the past to the point where I stopped paying attention to what the underlying IME is and I don't recall any special steps other then choosing my keyboard layout and enabling Japanese. Any help would be appreciated!

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  • adjust resolution on Ubuntu Server 10.04?

    - by Mike Grace
    Installed Ubuntu Server 10.04 on an old laptop and I noticed that the system is trying to show the CLI below my screen. This means that if I run a script or a program with a bunch of output, once it is done, I have to press return several times to bring the output to the point where I can actually see it on the screen. I also have to clear the screen to be able to see what I am typing at the current command prompt. The laptop is an EliteGroup 536S with a native screen resolution of 1024 x 768 How can I adjust the resolution for Ubuntu Server 10.04? What file do I need to edit if editing a file is the solution? I've seen posts on how to change the resolution on the desktop version of Ubuntu but not the server version.

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  • API Design Techniques

    - by Dehumanizer
    Is it right or more beautiful to name the functions with an prefix, like in Qt? Or using "many" namespaces, but 'normal' names for functions? For example, slOpenFile(); //"sl" means "some lib" vs some_lib::file_functions::openFile(); UPD: I've read somewhere that the first variant(using some prefix) is better, because the API users can perform 'fast' search among the documentation and in the Internet. E.g. by typing the magic prefix search engine starts to advice the exact functions. Is it enough to use the first variant?

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  • Where to find clients who are willing to pay top dollar for highly reliable code?

    - by Robin Green
    I'm looking to find clients who are willing to pay a premium above usual contractor rates, for software that is developed with advanced tools and techniques to eliminate certain classes of bugs. However, I have little experience of contracting, and relatively few contacts. It's important to state that the kind of tools and techniques I'm thinking of (e.g. formal verification) are used commercially extremely rarely, as far as I'm aware. There is kind of a continuum of approaches to higher reliability, with basic testing and basic static typing at one end and full-blown formal verification at the other, but the methods I'm thinking of are towards the latter end of the spectrum.

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  • How can I install binutils from source?

    - by sven
    uname -a: Linux ubuntu 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:05:29 UTC 2013 i686 i686 i686 GNU/Linux root@ubuntu:/home/ubuntu# apt-get source binutils Reading package lists... Done Building dependency tree Reading state information... Done E: Ignore unavailable target release 'stable' of package 'binutils' E: Unable to find a source package for I did apt-get update before typing the command. How can I get binutils? I am using Ubuntu 12.10. I am following the instruction on https://wiki.ubuntu.com/Toolchain/Crosscompilers/ARMEABIToolchain I am stuck at the first line. I did sudo add-apt-repository ppa:germia/archive3 previously, however I got some errors then, I did sudo add-apt-repository --remove ppa:germia/archive3 to undo the setting. I wonder if my problem is related wtih this PPA?

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  • Choppy/unresponsive keyboard and mouse pointer until suspend

    - by Stefan Thyberg
    I had a problem where my mouse and keyboard would be choppy, the mouse pointer would work at 1-2 fps and the keyboard would keep missing letters as I was typing them. Since they were both USB I suspected there was a problem there immediately. Whenever I got this problem I would suspend the computer and start it again and the problem would be gone. The problem started appearing when I plugged the mouse and keyboard directly into the computer rather than the USB hub in the screen. I'm using a Logitech UltraX Flat and a Razer Lachesis, but I'm not sure if that matters.

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  • Login screen doesn't prompt for password

    - by jbristow
    I just installed Ubuntu 12.10, and tied it to my company LDAP. On the login screen, instead of prompting for a password there is just a "Log In" button by my name. I click it, and I am immediately logged in without typing in a password. I checking my User Account options, and "Automatic Login" is turned off. I can also click on other LDAP users accounts, and get in without a password. There is a local user on the system. When I try to log in as that user, I am prompted for a password.

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  • Differences between C# and Javascript for Unity [closed]

    - by vrinek
    Apart from the language differences (class-based vs prototypical, strong vs weak typing), what are the differences between using Javascript and using C# when developing games in Unity3D? Is there a noticable performance difference? Is the javascript code packaged as-is? And if yes, does this help the game's modability? Is it possible to use libraries developed for one language while developing in the other one? Is it possible to mix the two languages in the same Unity project by coding some parts in C# and others in Javascript? The next couple of questions are time-specific so feel free to ignore or remove: If libraries are not cross-functional, which language has better library support from the game development perspective? Which language has better game dev specific resources available (books, websites, forums)?

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  • Is Haskell's type system an obstacle to understanding functional programming?

    - by Eric Wilson
    I'm studying Haskell for the purpose of understanding functional programming, with the expectation that I'll apply the insight that I gain in other languages (Groovy, Python, JavaScript mainly.) I choose Haskell because I had the impression that it is very purely functional, and wouldn't allow for any reliance on state. I did not choose to learn Haskell because I was interested in navigating an extremely rigid type system. My question is this: Is a strong type system a necessary by-product of an extremely pure functional language, or is this an unrelated design choice particular to Haskell? If it is the latter, I'm curious what would be the most purely functional language that is dynamically typed. I'm not particularly opposed to strong typing, it has its place, but I'm having a hard time seeing how it benefits me in this educational endeavor.

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  • MVVM - how to make creating viewmodels at runtime less painfull

    - by Mr Happy
    I apologize for the long question, it reads a bit as a rant, but I promise it's not! I've summarized my question(s) below In the MVC world, things are straightforward. The Model has state, the View shows the Model, and the Controller does stuff to/with the Model (basically), a controller has no state. To do stuff the Controller has some dependencies on web services, repository, the lot. When you instantiate a controller you care about supplying those dependencies, nothing else. When you execute an action (method on Controller), you use those dependencies to retrieve or update the Model or calling some other domain service. If there's any context, say like some user wants to see the details of a particular item, you pass the Id of that item as parameter to the Action. Nowhere in the Controller is there any reference to any state. So far so good. Enter MVVM. I love WPF, I love data binding. I love frameworks that make data binding to ViewModels even easier (using Caliburn Micro a.t.m.). I feel things are less straightforward in this world though. Let's do the exercise again: the Model has state, the View shows the ViewModel, and the ViewModel does stuff to/with the Model (basically), a ViewModel does have state! (to clarify; maybe it delegates all the properties to one or more Models, but that means it must have a reference to the model one way or another, which is state in itself) To do stuff the ViewModel has some dependencies on web services, repository, the lot. When you instantiate a ViewModel you care about supplying those dependencies, but also the state. And this, ladies and gentlemen, annoys me to no end. Whenever you need to instantiate a ProductDetailsViewModel from the ProductSearchViewModel (from which you called the ProductSearchWebService which in turn returned IEnumerable<ProductDTO>, everybody still with me?), you can do one of these things: call new ProductDetailsViewModel(productDTO, _shoppingCartWebService /* dependcy */);, this is bad, imagine 3 more dependencies, this means the ProductSearchViewModel needs to take on those dependencies as well. Also changing the constructor is painfull. call _myInjectedProductDetailsViewModelFactory.Create().Initialize(productDTO);, the factory is just a Func, they are easily generated by most IoC frameworks. I think this is bad because Init methods are a leaky abstraction. You also can't use the readonly keyword for fields that are set in the Init method. I'm sure there are a few more reasons. call _myInjectedProductDetailsViewModelAbstractFactory.Create(productDTO); So... this is the pattern (abstract factory) that is usually recommended for this type of problem. I though it was genious since it satisfies my craving for static typing, until I actually started using it. The amount of boilerplate code is I think too much (you know, apart from the ridiculous variable names I get use). For each ViewModel that needs runtime parameters you'll get two extra files (factory interface and implementation), and you need to type the non-runtime dependencies like 4 extra times. And each time the dependencies change, you get to change it in the factory as well. It feels like I don't even use an DI container anymore. (I think Castle Windsor has some kind of solution for this [with it's own drawbacks, correct me if I'm wrong]). do something with anonymous types or dictionary. I like my static typing. So, yeah. Mixing state and behavior in this way creates a problem which don't exist at all in MVC. And I feel like there currently isn't a really adequate solution for this problem. Now I'd like to observe some things: People actually use MVVM. So they either don't care about all of the above, or they have some brilliant other solution. I haven't found an indepth example of MVVM with WPF. For example, the NDDD-sample project immensely helped me understand some DDD concepts. I'd really like it if someone could point me in the direction of something similar for MVVM/WPF. Maybe I'm doing MVVM all wrong and I should turn my design upside down. Maybe I shouldn't have this problem at all. Well I know other people have asked the same question so I think I'm not the only one. To summarize Am I correct to conclude that having the ViewModel being an integration point for both state and behavior is the reason for some difficulties with the MVVM pattern as a whole? Is using the abstract factory pattern the only/best way to instantiate a ViewModel in a statically typed way? Is there something like an in depth reference implementation available? Is having a lot of ViewModels with both state/behavior a design smell?

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  • High contrast theme Firefox problem

    - by user87239
    I am using the high contrast inverse theme in 12.04 as I am visually impaired. This generally works great but causes a problem in Firefox as entered text e.g into a Google search is white. As the text background is also white you cannot see what you are typing. I have read through a good thirty websites with similar issues but thus far nothing works. I have tried all the settings in Firefox like un-checking "Use System Defaults" as well as manually telling Firefox what colours to use and these setting have absolutely no effect on anything.

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  • HTG Explains: Why Does Photo Paper Improve Print Quality?

    - by Eric Z Goodnight
    So you’ve shelled out the money for a fancy inkjet photo printer, only you’re not impressed with the images you’re getting out of your standard office paper. Have you ever wondered why that photo paper works so much better? Surely, paper is paper, right? What can be so special about it? In this article, we’ll explore the differences between regular typing paper, why these differences are good for printing, and how to take advantage of them for superior photographic printing Latest Features How-To Geek ETC The 50 Best Registry Hacks that Make Windows Better The How-To Geek Holiday Gift Guide (Geeky Stuff We Like) LCD? LED? Plasma? The How-To Geek Guide to HDTV Technology The How-To Geek Guide to Learning Photoshop, Part 8: Filters Improve Digital Photography by Calibrating Your Monitor Our Favorite Tech: What We’re Thankful For at How-To Geek Settle into Orbit with the Voyage Theme for Chrome and Iron Awesome Safari Compass Icons Set Escape from the Exploding Planet Wallpaper Move Your Tumblr Blog to WordPress Pytask is an Easy to Use To-Do List Manager for Your Ubuntu System Snowy Christmas House Personas Theme for Firefox

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  • Programming languages similar to ActionScript 3 / EcmaScript based

    - by Juanlu001
    I almost learned programming and OOP basic concepts with ActionScript 3 on the Flash Platform years ago. Some time has passed since then; I'm not a professional programmer, but I have written code in PHP, Fortran, and now Python. But, lately, I have missed ActionScript 3 OOP implementation, static typing and, I confess, curly braces. As Flash platform is slowly dying nowadays, I'm looking for an Open Sourced programming language similar to ActionScript 3. I've read about Java, which is the most similar one I found, but actually is the only one it doesn't interest me (I started to hate it after bad experiences with web applets). Any ideas? Edit: Added EcmaScript to the title and the tags; I think that is what I am looking for.

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