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  • Is it really free to deploy SharpDevelop apps?

    - by Gabriel
    I'm trying SharpDevelop to develop c# applications. Regardless of the language and the IDE, is it free to deploy applications that use WinForms? I've been developing with MonoDevelop just because it has a designer for Gtk# (client doesn't want to pay more for licences as to use VS...), but it's too buggy and it's making us lose lots of time. SharpDevelop looks great at first sight, but I wouldn't like the user or us to have problems with legal software. Thank you for the data! Warm regards.

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  • Mario and Luigi’s Pick-up Game of Baseball – Choosing Teams [Video]

    - by Asian Angel
    Mario and Luigi are choosing players for a pick-up game of baseball and Chargin’ Chuck is ready to go. Will Mario or Luigi pick him for their teams early on or will poor Chuck be the last one chosen? Note: Contains slightly inappropriate language. Dorkly Bits: Chargin’ Chuck Gets Picked Last [via Geeks are Sexy] HTG Explains: What’s the Difference Between the Windows 7 HomeGroups and XP-style Networking?Internet Explorer 9 Released: Here’s What You Need To KnowHTG Explains: How Does Email Work?

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  • what, why, when, should I learn computer science?

    - by dramasea
    I'm 16 years old and really an enthusiast on web programming. I know (X)HTML, css, javascript and php. And i heard about computer science. Below are my question: What is computer science? Should a web programmer learn computer science? If the answer of question 2 is yes, then what programming language(s) should I learn before I get into computer science (I saw the video of 'Introduction to computer science' which is one of the MIT opencourse and it started to use python without teaching you from scratch.) Can I learn computer science now? (Without a university degree, I can watch open courseware.)

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  • Le C++ expressif n° 3 : pourquoi les erreurs de templates posent problèmes, un article d'Eric Niebler traduit par Guillaume Belz

    Bienvenue dans le troisième article de la série « le C++ expressif », une série d'articles consacrés aux Domain-Specific Embedded Language (DSEL) et à Boost.Proto, une bibliothèque pour les implémenter en C++. Dans cet article, Eric Niebler aborde le problème délicat des messages d'erreurs générés par les templates et surtout le fait que ce n'est pas une fatalité. Il insiste en particulier sur le fait qu'il est de la responsabilités des concepteurs de bibliothèques de faire en sorte que les messages d'erreurs soient compréhensibles par les utilisateurs. Le C++ expressif n° 3 : pourquoi les erreurs des templates posent des problèmes et qu'est-ce que vous pouvez faire pour ça ?

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  • JavaScript Intellisense with Telerik in ASP.NET Master Page Project with VS 2010

    - by Otto Neff
    Today I was looking for a solution to get finally the JScript/Javascript/jQuery Intellisense Featureworking with my ASP.Net Webform Project to work. I found some good articles: - JScript IntelliSense Overview- JScript IntelliSense: A Reference for the “Reference” Tag- Enabling JavaScript intellisense in VS.NET 2010 to work with SharePoint 2010- Rich IntelliSense for jQueryBUT, all of suggested solutions did not work right with my Master Page based Visual Studio 2010 Solution.Only with physical Javascript Files (Telerik includes certain Javascript Files like jQuery as Ressource) or/andconfigure always a new ASP.NET Scriptmanager / RadScriptManager on every page derived from the Master Page, wasn't exactly what I was looking for. So I came up with the following simple Solution, to Trick VS2010and still have the Project running with multiple runat="server" Scriptmanagers. In short:- New ASP.NET control derived from ScriptManager with emtpy overwritten OnInit() to use it as emtpy wrapper for VS2010. In detail:New RadScriptManager Classusing System; using System.Collections.Generic; using System.Linq; using System.Web; using Telerik.Web.UI; namespace IntellisenseJavascript.Controls { public class IntelliJS : RadScriptManager { protected override void OnInit(EventArgs e) { } protected override void OnPreRender(EventArgs e) { } protected override void OnLoad(EventArgs e) { } protected override void Render(System.Web.UI.HtmlTextWriter writer) { } public override void RenderControl(System.Web.UI.HtmlTextWriter writer) { } } } web.config<configuration> ... <system.web> ... <pages> <controls> <add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI, Version=2011.3.1115.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4"/> <add tagPrefix="VSFix" namespace="IntellisenseJavascript.Controls" assembly="IntellisenseJavascript"/> </controls> </pages> ... Master Page<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="IntellisenseJavascript.Site" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html > <head id="head" runat="server"> <title></title> <telerik:RadStyleSheetManager ID="radStyleSheetManager" runat="server" /> </head> <body> <form id="form" runat="server"> <telerik:RadScriptManager ID="radScriptManager" runat="server"> <Scripts> <asp:ScriptReference Assembly="Telerik.Web.UI, Version=2011.3.1115.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4" Name="Telerik.Web.UI.Common.Core.js" /> <asp:ScriptReference Assembly="Telerik.Web.UI, Version=2011.3.1115.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4" Name="Telerik.Web.UI.Common.jQuery.js" /> <asp:ScriptReference Assembly="Telerik.Web.UI, Version=2011.3.1115.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4" Name="Telerik.Web.UI.Common.jQueryInclude.js" /> </Scripts> </telerik:RadScriptManager> <telerik:RadAjaxManager ID="radAjaxManager" runat="server"> </telerik:RadAjaxManager> <div> #MASTER CONTENT# <asp:ContentPlaceHolder ID="contentPlaceHolder" runat="server"> </asp:ContentPlaceHolder> </div> </form> <script type="text/javascript"> $(function () { // Masterpage ready $('body').css('margin', '50px'); }); </script> </body> </html> ASPX Page<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="IntellisenseJavascript.Default" %> <asp:Content ID="Content1" ContentPlaceHolderID="contentPlaceHolder" runat="server"> <VSFix:IntelliJS runat="server" ID="intelliJS"> <Scripts> <asp:ScriptReference Assembly="Telerik.Web.UI, Version=2011.3.1115.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4" Name="Telerik.Web.UI.Common.Core.js" /> <asp:ScriptReference Assembly="Telerik.Web.UI, Version=2011.3.1115.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4" Name="Telerik.Web.UI.Common.jQuery.js" /> <asp:ScriptReference Assembly="Telerik.Web.UI, Version=2011.3.1115.40, Culture=neutral, PublicKeyToken=121fae78165ba3d4" Name="Telerik.Web.UI.Common.jQueryInclude.js" /> </Scripts> </VSFix:IntelliJS> <div style="border: 5px solid #FF9900;"> #PAGE CONTENT# </div> <script type="text/javascript"> $(function () { // Page ready $('body').css('border', '5px solid #888'); }); </script> </asp:Content> The Result I know, this is not the way it meant to be... but now at least you can have a Main ScriptManager for all Common Scripts and Settings, inject page specific Javascripts in PageLoad Event in normal ASPX Files and have JavaScript Intellisense for defined Scripts from JS Files or Assembly Ressouce in your Content Maybe, vNext will fix this.

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  • Will TSQL become useless because of new ORMs? [closed]

    - by Saeed Neamati
    By introducing LINQ to SQL, I found myself and my .NET developer colleagues gradually moving from TSQL to C# to create queries on the database. Entity Framework made that shift almost permanent. Now it's nearly 2 years that I use LINQ to SQL and LINQ to Entities and haven't used TSQL that much. Yesterday, a colleague encountered a problem (he had to create a SP) and we went to help him. But we all found that our TSQL knowledge was diminished for sure, and a simple SP that seemed trivial to us 2 or 3 years ago, was a challenge to be solved yesterday. Thus it came to my mind that while TSQL's life is attached to SQL Server, and logically as long as SQL Server lives and doesn't change it's SQL language, TSQL would also live, practically it might die, and soon very few people might know it. Am I right? Do existence of ORMs like Entity Framework threaten TSQL's life and usability?

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  • Finding a problem in some task [closed]

    - by nagisa
    Recently I competed in nation wide programming contest finals. Not unexpectedly all problems were algorithmic. I lost (40 points out of 600. Winner got ~300). I know why I lost very well - I don't know how to find actual problem in those obfuscated tasks which are life-blood of every competition. I think that being self-taught and not well versed in algorithms got me too. As side effect of learning things myself I know how to search for information, however all I could find are couple questions about learning algorithms. For now I put Python Algorithms: Mastering Basic Algorithms in the Python Language and Analysis of Algorithms which I found in those questions to my "to read" list. That leaves my first problem of not knowing how to find a problem unsolved. Will that ability come with learning algorithms? Or does it need some special attention? Any suggestions are welcomed.

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  • installed openstack using devstack install shell script but getting 500 error when i try opening dashboard

    - by Arvind
    I followed the instructions at http://devstack.org/guides/single-machine.html to install OpenStack. I first installed Ubuntu on my Windows 7 PC using the officially supported Windows installer for Ubuntu 12.04 LTS. And after that I followed the instructions at above page to install OpenStack. As per instructions, I should be able to access the dashboard aka Horizon, at http://192.168.1.4/ (thats the IP of the PC on which I installed Ubuntu-OpenStack). However I am getting a 500 error web page when I open that. How do I resolve this error? I want to set up a dev environment for OpenStack. For your ref, the whole error message is given now-- FilterError at / /usr/bin/env: node: No such file or directory Request Method: GET Request URL: http://192.168.1.4/ Django Version: 1.4.2 Exception Type: FilterError Exception Value: /usr/bin/env: node: No such file or directory Exception Location: /usr/local/lib/python2.7/dist-packages/compressor/filters/base.py in input, line 133 Python Executable: /usr/bin/python Python Version: 2.7.3 Python Path: ['/opt/stack/horizon/openstack_dashboard/wsgi/../..', '/opt/stack/python-keystoneclient', '/opt/stack/python-novaclient', '/opt/stack/python-openstackclient', '/opt/stack/keystone', '/opt/stack/glance', '/opt/stack/python-glanceclient/setuptools_git-0.4.2-py2.7.egg', '/opt/stack/python-glanceclient', '/opt/stack/nova', '/opt/stack/horizon', '/opt/stack/cinder', '/opt/stack/python-cinderclient', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PIL', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/ubuntuone-client', '/usr/lib/python2.7/dist-packages/ubuntuone-control-panel', '/usr/lib/python2.7/dist-packages/ubuntuone-couch', '/usr/lib/python2.7/dist-packages/ubuntuone-storage-protocol', '/opt/stack/horizon/openstack_dashboard'] Server time: Sat, 27 Oct 2012 08:43:29 +0000 Error during template rendering In template /opt/stack/horizon/openstack_dashboard/templates/_stylesheets.html, error at line 3 /usr/bin/env: node: No such file or directory 1 {% load compress %} 2 3 {% compress css %} 4 <link href='{{ STATIC_URL }}dashboard/less/horizon.less' type='text/less' media='screen' rel='stylesheet' /> 5 {% endcompress %} 6 7 <link rel="shortcut icon" href="{{ STATIC_URL }}dashboard/img/favicon.ico"/> 8 Also, the traceback is now given below-- Environment: Request Method: GET Request URL: http://192.168.1.4/ Django Version: 1.4.2 Python Version: 2.7.3 Installed Applications: ('openstack_dashboard', 'django.contrib.contenttypes', 'django.contrib.auth', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'django.contrib.humanize', 'compressor', 'horizon', 'openstack_dashboard.dashboards.project', 'openstack_dashboard.dashboards.admin', 'openstack_dashboard.dashboards.settings', 'openstack_auth') Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'horizon.middleware.HorizonMiddleware', 'django.middleware.doc.XViewMiddleware', 'django.middleware.locale.LocaleMiddleware') Template error: In template /opt/stack/horizon/openstack_dashboard/templates/_stylesheets.html, error at line 3 /usr/bin/env: node: No such file or directory 1 : {% load compress %} 2 : 3 : {% compress css %} 4 : <link href='{{ STATIC_URL }}dashboard/less/horizon.less' type='text/less' media='screen' rel='stylesheet' /> 5 : {% endcompress %} 6 : 7 : <link rel="shortcut icon" href="{{ STATIC_URL }}dashboard/img/favicon.ico"/> 8 : Traceback: File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response 111. response = callback(request, *callback_args, **callback_kwargs) File "/usr/local/lib/python2.7/dist-packages/django/views/decorators/vary.py" in inner_func 36. response = func(*args, **kwargs) File "/opt/stack/horizon/openstack_dashboard/wsgi/../../openstack_dashboard/views.py" in splash 38. return shortcuts.render(request, 'splash.html', {'form': form}) File "/usr/local/lib/python2.7/dist-packages/django/shortcuts/__init__.py" in render 44. return HttpResponse(loader.render_to_string(*args, **kwargs), File "/usr/local/lib/python2.7/dist-packages/django/template/loader.py" in render_to_string 176. return t.render(context_instance) File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render 140. return self._render(context) File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _render 134. return self.nodelist.render(context) File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render 823. bit = self.render_node(node, context) File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node 74. return node.render(context) File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render 155. return self.render_template(self.template, context) File "/usr/local/lib/python2.7/dist-packages/django/template/loader_tags.py" in render_template 137. output = template.render(context) File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render 140. return self._render(context) File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in _render 134. return self.nodelist.render(context) File "/usr/local/lib/python2.7/dist-packages/django/template/base.py" in render 823. bit = self.render_node(node, context) File "/usr/local/lib/python2.7/dist-packages/django/template/debug.py" in render_node 74. return node.render(context) File "/usr/local/lib/python2.7/dist-packages/compressor/templatetags/compress.py" in render 147. return self.render_compressed(context, self.kind, self.mode, forced=forced) File "/usr/local/lib/python2.7/dist-packages/compressor/templatetags/compress.py" in render_compressed 107. rendered_output = self.render_output(compressor, mode, forced=forced) File "/usr/local/lib/python2.7/dist-packages/compressor/templatetags/compress.py" in render_output 119. return compressor.output(mode, forced=forced) File "/usr/local/lib/python2.7/dist-packages/compressor/css.py" in output 51. ret.append(subnode.output(*args, **kwargs)) File "/usr/local/lib/python2.7/dist-packages/compressor/css.py" in output 53. return super(CssCompressor, self).output(*args, **kwargs) File "/usr/local/lib/python2.7/dist-packages/compressor/base.py" in output 230. content = self.filter_input(forced) File "/usr/local/lib/python2.7/dist-packages/compressor/base.py" in filter_input 192. for hunk in self.hunks(forced): File "/usr/local/lib/python2.7/dist-packages/compressor/base.py" in hunks 167. precompiled, value = self.precompile(value, **options) File "/usr/local/lib/python2.7/dist-packages/compressor/base.py" in precompile 210. command=command, filename=filename).input(**kwargs) File "/usr/local/lib/python2.7/dist-packages/compressor/filters/base.py" in input 133. raise FilterError(err) Exception Type: FilterError at / Exception Value: /usr/bin/env: node: No such file or directory

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  • Would a cut and paste coder ever get past a job interview?

    - by bigdave
    As a long time cut and paste coder I never committed much of the syntax of a language to memory. Even worse, I now use google to solve many of the coding problems which are of the type typically used in job interviews. This has greatly increased my productivity, the quality of the end result and stops me perpetuating the same bugs across all my code. However it means I don't actually remember the detail of the solution. For some reason in a job interview "I would look that up on google" does not seem to be the right answer. Am I better off in the interview to pass no comment on my coding style and simply pull out an iPad and produce the solution?

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  • UPK Content State

    - by peter.maravelias
    State is an editable property for communicating the status of a document in the UPK library. This is particularly helpful when working with other authors in a development team. Authors can assign a state to any document using the values that are defined in the master list. The default master list of State values includes Not Started, Draft, In Review, and Final (in the language installed on the server). Administrators can customize the list by adding, deleting, or renaming the values as well as sequencing the values as they will appear on the assignment list from the Properties pane. Let us know if or how you are using UPK Content States in your development efforts!

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  • what, why, when, should I learn computer science?

    - by dramasea
    I'm 16 years old and really an enthusiast on web programming. I know (X)HTML, css, javascript and php. And i heard about computer science. Below are my question: What is computer science is? Should a web programmer learn computer science? If the answer of question 2 is yes, then what programming language should i learn before i get into computer science(I saw the video of 'Introduction to computer science' which is one of the MIT opencourse and it started to use python without teaching u from scratch) Can I learn computer science now?(Without a university degree, i can watch opencourseware)

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  • Oracle Extends Life Sciences Edition in New Release

    - by charles.knapp
    By Chris Kanaracus, IDG News Service Oracle (ORCL) announced the 17th version of its on-demand CRM (customer relationship management) application Wednesday and made a fresh push into pharmaceutical sales with a Life Sciences edition of the software. New features in CRM on Demand Release 17 include tools for managing sales pipelines and performing forecasts of future business; a redesigned user interface; and added language support. But one CRM industry observer flagged the Life Sciences product as a particular point of interest. Read the full article here.

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  • Follow your friends on StackOverflow with FriendOverflow

    - by Mike Grace
    Screenshot About I created this app because I wanted to see what my friends and co-workers were doing on StackOverflow. I was previously going to their profiles to see what they were asking, answering, and commenting on because most of the time I found what they were doing was interesting or relevant to what I was doing. This app is for anyone who visits StackOverflow using their desktop browser and has 'friends' they would like to follow on StackOverflow. Cost Free Download Google Chrome extension http://goo.gl/ooE34 Mozilla Firefox extension http://goo.gl/3Pnqa Bookmarklet http://goo.gl/FkuQW Platform Desktop browsers via Google Chrome extension, Mozilla Firefox extension, and bookmarklet Contact @MikeGrace Code App was built on the Kynetx platform using KRL (Kynetx Rule Language)

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  • Female Armor is Horribly Designed [Humorous Video]

    - by Asian Angel
    Our intrepid group of adventurers show up at the blacksmith shop to pick up their new armor, but not all is well. The two gentlemen in the group “provided” the design for their companion’s armor and she is less than pleased with the result. Does she get the armor and revenge she wants? Watch to find out! Note 1: Video contains some language that may be considered inappropriate. Note 2: Make sure to catch the last few seconds of the video for the best part of all! Female Armor Sucks [via Dorkly Bits] How To Encrypt Your Cloud-Based Drive with BoxcryptorHTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)

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  • Programmaticaly finding the Landau notation (Big O or Theta notation) of an algorithm?

    - by Julien L
    I'm used to search for the Landau (Big O, Theta...) notation of my algorithms by hand to make sure they are as optimized as they can be, but when the functions are getting really big and complex, it's taking way too much time to do it by hand. it's also prone to human errors. I spent some time on Codility (coding/algo exercises), and noticed they will give you the Landau notation for your submitted solution (both in Time and Memory usage). I was wondering how they do that... How would you do it? Is there another way besides Lexical Analysis or parsing of the code? PS: This question concerns mainly PHP and or JavaScript, but I'm opened to any language and theory.

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  • O&rsquo;Reilly Deal of the Day 6/August/2014 - Professional C# 5.0 and .NET 4.5.1

    - by TATWORTH
    Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2014/08/06/orsquoreilly-deal-of-the-day-6august2014---professional-c-5.0.aspxToday’s half-price deal from O’Reilly at http://shop.oreilly.com/product/9781118833032.do?code=MSDEAL, is Professional C# 5.0 and .NET 4.5.1. “Written by a dream team of .NET experts, Professional C# 5.0 and .NET 4.5.1 includes everything developers need to work with C#, the language of choice for .NET applications. This book is perfect for both experienced C# programmers looking to sharpen their skills and professional developers who are using C# for the first time. The authors deliver unparalleled coverage of Visual Studio 2013 and .NET Framework 4.5.1 additions, as well as new test-driven development and concurrent programming features. Source code for all the examples are available for download, so you can start writing Windows desktop, Windows Store apps, and ASP.NET web applications immediately.”

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  • Is OpenGL after C++ job oriented?

    - by Ani
    First, my regards to all programmers out there who have put their endless efforts in learning and becoming expert, wise, efficient and best. Let me describe my situation. I have just graduated from Electronics and Communication Stream. Though I have more interest in software development and hence I have opted to become a software developer rather than Electronics engg. I have learned C++ and wish to wish to go more deep. I have started to learn OpenGL. Guide me in the following: Is OpenGL good to learn and is it job oriented? Should I learn some other language rather then OpenGL after C++?

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  • "Software sources" crashes since unbuntu updated from 12.04 to 12.10

    - by Jean-Sebastien
    First of all, sorry for my English, I is not my native language. I recently updated my PC from ubuntu 12.04 to 12.10. Now “Software sources” crashes when I try to open it directly from Unity or from Ubuntu Software Center ? Software sources. When I try to open “Update manager”, I get the following error message. Note that the internet connection WROKS! W:Failed to fetch http://ppa.launchpad.net/rye/ubuntuone-extras/ubuntu/dists/quantal/main/source/Sources 404 Not Found, ... ... ... E:Some index files failed to download. They have been ignored, or old ones used instead. Please, can somebody help me on this? JS

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  • IIS SEO Toolkit Available in 10 Languages

    A couple of months ago I blogged about the release of the v1.0.1 of the IIS Search Engine Optimization Toolkit. In March we released the localized versions of the SEO Toolkit so now it is available in 10 languages: English, Japanese, French, Russian, Korean, German, Spanish, Chinese Simplified, Italian and Chinese Traditional. Here are all the direct links to download it. Name Language Download URL IIS SEO Toolkit 32bit english http://download.microsoft.com/download/A/C/A/ACA8D740-A59D-4D25-A2D5-1DCFD1D9A01F/IISSEO_x86.msi IIS...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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  • Pure virtual or abstract, what's in a name?

    - by Steven Jeuris
    While discussing a question about virtual functions on Stack Overflow, I wondered whether there was any official naming for pure (abstract) and non-pure virtual functions. I always relied on wikipedia for my information, which states that pure and non-pure virtual functions are the general term. Unfortunately, the article doesn't back it up with a origin or references. To quote Jon Skeet's answer to my reply that pure and non-pure are the general term used: @Steven: Hmm... possibly, but I've only ever seen it in the context of C++ before. I suspect anyone talking about them is likely to have a C++ background :) Did the terms originate from C++, or were they first defined or implemented in a earlier language, and are they the 'official' scientific terms?

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  • C++ Little Wonders: The C++11 auto keyword redux

    - by James Michael Hare
    I’ve decided to create a sub-series of my Little Wonders posts to focus on C++.  Just like their C# counterparts, these posts will focus on those features of the C++ language that can help improve code by making it easier to write and maintain.  The index of the C# Little Wonders can be found here. This has been a busy week with a rollout of some new website features here at my work, so I don’t have a big post for this week.  But I wanted to write something up, and since lately I’ve been renewing my C++ skills in a separate project, it seemed like a good opportunity to start a C++ Little Wonders series.  Most of my development work still tends to focus on C#, but it was great to get back into the saddle and renew my C++ knowledge.  Today I’m going to focus on a new feature in C++11 (formerly known as C++0x, which is a major move forward in the C++ language standard).  While this small keyword can seem so trivial, I feel it is a big step forward in improving readability in C++ programs. The auto keyword If you’ve worked on C++ for a long time, you probably have some passing familiarity with the old auto keyword as one of those rarely used C++ keywords that was almost never used because it was the default. That is, in the code below (before C++11): 1: int foo() 2: { 3: // automatic variables (allocated and deallocated on stack) 4: int x; 5: auto int y; 6:  7: // static variables (retain their value across calls) 8: static int z; 9:  10: return 0; 11: } The variable x is assumed to be auto because that is the default, thus it is unnecessary to specify it explicitly as in the declaration of y below that.  Basically, an auto variable is one that is allocated and de-allocated on the stack automatically.  Contrast this to static variables, that are allocated statically and exist across the lifetime of the program. Because auto was so rarely (if ever) used since it is the norm, they decided to remove it for this purpose and give it new meaning in C++11.  The new meaning of auto: implicit typing Now, if your compiler supports C++ 11 (or at least a good subset of C++11 or 0x) you can take advantage of type inference in C++.  For those of you from the C# world, this means that the auto keyword in C++ now behaves a lot like the var keyword in C#! For example, many of us have had to declare those massive type declarations for an iterator before.  Let’s say we have a std::map of std::string to int which will map names to ages: 1: std::map<std::string, int> myMap; And then let’s say we want to find the age of a given person: 1: // Egad that's a long type... 2: std::map<std::string, int>::const_iterator pos = myMap.find(targetName); Notice that big ugly type definition to declare variable pos?  Sure, we could shorten this by creating a typedef of our specific map type if we wanted, but now with the auto keyword there’s no need: 1: // much shorter! 2: auto pos = myMap.find(targetName); The auto now tells the compiler to determine what type pos should be based on what it’s being assigned to.  This is not dynamic typing, it still determines the type as if it were explicitly declared and once declared that type cannot be changed.  That is, this is invalid: 1: // x is type int 2: auto x = 42; 3:  4: // can't assign string to int 5: x = "Hello"; Once the compiler determines x is type int it is exactly as if we typed int x = 42; instead, so don’t' confuse it with dynamic typing, it’s still very type-safe. An interesting feature of the auto keyword is that you can modify the inferred type: 1: // declare method that returns int* 2: int* GetPointer(); 3:  4: // p1 is int*, auto inferred type is int 5: auto *p1 = GetPointer(); 6:  7: // ps is int*, auto inferred type is int* 8: auto p2 = GetPointer(); Notice in both of these cases, p1 and p2 are determined to be int* but in each case the inferred type was different.  because we declared p1 as auto *p1 and GetPointer() returns int*, it inferred the type int was needed to complete the declaration.  In the second case, however, we declared p2 as auto p2 which means the inferred type was int*.  Ultimately, this make p1 and p2 the same type, but which type is inferred makes a difference, if you are chaining multiple inferred declarations together.  In these cases, the inferred type of each must match the first: 1: // Type inferred is int 2: // p1 is int* 3: // p2 is int 4: // p3 is int& 5: auto *p1 = GetPointer(), p2 = 42, &p3 = p2; Note that this works because the inferred type was int, if the inferred type was int* instead: 1: // syntax error, p1 was inferred to be int* so p2 and p3 don't make sense 2: auto p1 = GetPointer(), p2 = 42, &p3 = p2; You could also use const or static to modify the inferred type: 1: // inferred type is an int, theAnswer is a const int 2: const auto theAnswer = 42; 3:  4: // inferred type is double, Pi is a static double 5: static auto Pi = 3.1415927; Thus in the examples above it inferred the types int and double respectively, which were then modified to const and static. Summary The auto keyword has gotten new life in C++11 to allow you to infer the type of a variable from it’s initialization.  This simple little keyword can be used to cut down large declarations for complex types into a much more readable form, where appropriate.   Technorati Tags: C++, C++11, Little Wonders, auto

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  • Does HTML 5 &ldquo;Rich vs. Reach&rdquo; a False Choice?

    - by andrewbrust
    The competition between the Web and proprietary rich platforms, including Windows, Mac OS, iPhone/iPad, Adobe’s Flash/AIR and Microsoft’s Silverlight, is not new. But with the emergence of HTML 5 and imminent support for it in the next release of the major Web browsers, the battle is heating up. And with the announcements made Wednesday at Google's I/O conference, it's getting kicked up yet another notch. The impact of this platform battle on companies in the media and advertising world, and the developers who serve them, is significant. The most prominent question is whether video and rich media online will shift towards pure HTML and away from plug-ins like Flash and Silverlight. In fact, certain features in HTML 5 make it suitable for development for line of business applications as well, further threatening those plug-in technologies. So what's the deal? Is this real or hype? To answer that question, I've done my own research into HTML 5's features and talked to several media-focused, New York area developers to get their opinions. I present my findings to you in this post. Before bearing down into HTML 5 specifics and practitioners’ quotes, let's set the context. To understand what HTML 5 can do, take a look at this video of Sports Illustrated’s HTML 5 prototype. This should start to get you bought into the idea that HTML 5 could be a game-changer. Next, if you happen to have installed the beta version of Google's Chrome 5 browser, take a look at the page linked to below, and in that page, click on any of the game thumbnails to see what's possible, without a plug-in, in this brave new world. (Note, although the instructions for each game tell you to press the A key to start, press the Z key instead.). Here's the link: http://www.kesiev.com/akihabara As an adjunct to what's enabled by HTML 5, consider the various transforms that are part of CSS 3. If you're running Safari as your browser, the following link will showcase this live; if not, you'll see a bitmap that will give you an idea of what's possible: http://webkit.org/blog/386/3d-transforms Are you starting to get the picture (literally)? What has up until now required browser plug-ins and other patches to HTML, most typically Flash, will soon be renderable, natively, in all major browsers. Moreover, it's looking likely that developers will be able to deliver such content and experiences in these browsers using one base of markup and script code (using straight JavaScript and/or jQuery), without resorting to browser-specific code and workarounds. If you're skeptical of this, I wouldn't blame you, especially with respect to Microsoft's Internet Explorer. However, i can tell you with confidence that even Microsoft is dedicated to full-on HTML 5 support in version 9 of that browser, which is currently under development. So what’s new in HTML 5, specifically, that makes sites like this possible?  The specification documents go into deep detail, and there’s no sense in rehashing them here, but a summary is probably in order.   Here is a non-authoritative, but useful, list of the major new feature areas in HTML 5: 2D drawing capabilities and 3D transforms. 2D drawing instructions can be embedded statically into a Web page; application interactivity and animation can be achieved through script.  As mentioned above, 3D transforms are technically part of version 3 of the CSS (Cascading Style Sheets) spec, rather than HTML 5, but they can nonetheless be thought of as part of the bundle.  They allow for rendering of 3D images and animations that, together with 2D drawing, make HTML-based games much more feasible than they are presently, as the links above demonstrate. Embedded audio and video. A media player can appear directly in a rendered Web page, using HTML markup and no plug-ins. Alternately, player controls can be hidden and the content can play automatically. Major enhancements to form-based input. This includes such things as specification of required fields, embedding of text “hints” into a control, limiting valid input on a field to dates, email addresses or a list of values.  There’s more to this, but the gist is that line-of-business applications, with complicated input and data validation, are supported directly Offline caching, local storage and client-side SQL database. These facilities allow Web applications to function more like native apps, even if no internet connection is available. User-defined data. Data (or metadata – data about data) can easily be embedded statically and/or retrieved and updated with Javascript code. This avoids having to embed that data in a separate file, or within script code. Taken together, these features position HTML to compete with, and perhaps overtake, Adobe’s Flash/AIR (and Microsoft’s Silverlight) as a viable Web platform for media, RIAs (rich internet applications – apps that function more like desktop software than Web sites) and interactive Web content, including games. What do players in the media world think about this?  From the embedded video above, we know what Sports Illustrated (and, therefore, Time Warner) think.  Hulu, the major Internet site for broadcast TV content, is on record as saying HTML5 video does not pass muster with them, at least not yet.  YouTube, on the other hand, already has an experimental HTML 5-based version of their site.  TechCrunch has reported that NetFlix is flirting with HTML 5 too, especially as it pertains to embedded browsers in TV-based devices.  And the New York Times’ Web site now embeds some video clips without resorting to Flash.  They have to – otherwise iPhone, iPod Touch and iPad users couldn’t see them in the Mobile Safari browser. What do media-focused developers think about all this?  I talked to several to get their opinions. Michael Pinto is CEO and Founder of Very Memorable Design whose primary focus has been to help marketing directors get traction online.  The firm’s client roster includes the likes Time, Inc., Scholastic and PBS.  Pinto predicts that “More and more microsites that were done entirely in Flash will be done more and more using jQuery. I can also see slideshows and video now being done without Flash. However if you needed to create a game or highly interactive activity Flash would still be the way to go for the web.” A dissenting view comes from Jesse Erlbaum, CEO of The Erlbaum Group, LLC, which serves numerous clients in the magazine publishing sector.  When I asked Erlbaum whether he thought HTML 5 and jQuery/JavaScript would steal significant market share from Flash, he responded “Not at all!  In particular, not for media and advertising customers!  These sectors are not generally in the business of making highly functional applications, which is the one place where HTML5/jQuery/etc really shines.” Ironically, Pinto’s firm is a heavy user of Flash for its projects and Erlbaum’s develops atop the “LAMP” (Linux, Apache, MySQL and PHP/Perl) stack.  For whatever reason, each firm seems to see the other’s toolset as a more viable choice.  But both agree that the developer tool story around HTML 5 is deficient.  Pinto explains “What’s lost with [HTML 5 and Javascript] techniques is that there isn’t a single widely favored easy-to-use tool of choice for authoring. So with Flash you can get up and running right away and not worry about what is different from one browser to the next.“  Erlbaum agrees, saying: “HTML5/Javascript lacks a sophisticated integrated development environment (IDE) which is an essential part of Flash.  If what someone is trying to make is primarily animation, it's a waste of time…to do this in Javascript.  It can be done much more easily in Flash, and with greater cross-browser compatibility and consistency due to the ubiquity of Flash.” Adobe (maker of Flash since its 2005 acquisition of Macromedia) likely agrees.  And for better or worse, they’ve decided to address this shortcoming of HTML 5, even at risk of diminishing their Flash platfrom. Yesterday Adobe announced that their hugely popular Deamweaver Web design authoring tool would directly support HTML 5 and CSS 3 development.  In fact, the Adobe Dreamweaver CS5 HTML5 Pack is downloadable now from Adobe Labs. Maybe Adobe is bowing to pressure from ardent Web professionals like Scott Kellum, Lead Designer at Channel V Media,  a digital and offline branding firm, serving the media and marketing sectors, among others.  Kellum told me that HTML 5 “…will definitely move people away from Flash. It has many of the same functionalities with faster load times and better accessibility. HTML5 will help Flash as well: with the new caching methods you can now even run Flash apps offline.” Although all three Web developers I interviewed would agree that Flash is still required for more sophisticated applications, Kellum seems to have put his finger on why HTML 5 may nonetheless dominate.  In his view, much of the Web development out there has little need for high-end capabilities: “Most people want to add a little punch to a navigation bar or some video and now you can get the biggest bang for your buck with HTML5, CSS3 and Javascript.” I’ve already mentioned that Google’s ongoing I/O conference, at the Moscone West center in San Francisco, is driving the HTML 5 news cycle, big time.  And Google made many announcements of their own, including the open sourcing of their VP8 video codec, new enterprise-oriented capabilities for its App Engine cloud offering, and the creation of the Chrome Web Store, which the company says will make it easier to find and “install” Web applications, in a fashion similar to  the way users procure native apps on various mobile platforms. HTML 5 looks to be disruptive, especially to the media world.  And even if the technology ends up disappointing, the chatter around it alone is causing big changes in the technology world.  If the richness it promises delivers, then magazine publishers and non-text digital advertisers may indeed have a platform for creating compelling content that loads quickly, is standards-based and will render identically in (the newest versions of) all major Web browsers.  Can this development in the digital arena save the titans of the print world?  I can’t predict, but it’s going to be fun to watch, and the competitive innovation from all players in both industries will likely be immense.

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  • What do neglected O'Reilly book topics tell us about that topic?

    - by Peter Turner
    Does anybody know how O'Reilly chooses topics to publish? For some reason, I don't see how it can be based on demand. The reason, I ask, is because they haven't published a Delphi book in almost 12 years and Object Pascal is at least as esoteric as Erlang and as practical as PHP and as robust as C++. So, maybe someone knows what rationale is behind O'Reilly's publishing methodology or what it is supposed to tell us about the relative popularity or usefulness of any given language or programming technique? Oh, I forgot about pig and robotlegs

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  • Rhythmbox not saving the album art permanently

    - by Nik
    I run ubuntu 10.10 and use rhythmbox (version 0.13.1) regularly with the albumartsearch plugin installed. However when I change the album art it is only temporary. On moving to the next song it automatically removes the previous song's album art cover. (I do know about banshee but would like to use rhythmbox). The cover art plugin is also installed by default however it cannot display some of the album covers since the songs are in my local language (tamil) hence it cannot retrieve the album cover from the internet. However the albumartsearch plugin seems to do the job although only temporarily. Any reason why it might be? I have tried looking for other rhythmbox plugins which might be similar to albumartsearch but in vain. Any help would be appreciated. I have filed a bug in the albumartsearch plugin's website. Waiting for the reply.

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  • O&rsquo;Reilly Deal of the Day 4/Aug/2014 - Windows PowerShell 4.0 for .NET Developers

    - by TATWORTH
    Originally posted on: http://geekswithblogs.net/TATWORTH/archive/2014/08/04/orsquoreilly-deal-of-the-day-4aug2014---windows-powershell-4.0.aspxToday’s half-price Deal of the Day from O’Reilly at http://shop.oreilly.com/product/9781849688765.do?code=MSDEAL is Windows PowerShell 4.0 for .NET Developers. “The world of technology is growing faster than ever, and the business needs are getting more complex every day. With PowerShell in your toolbox, you have an object-based scripting language, task-based shell, along with a powerful automation engine. PowerShell is built on top of .NET framework which gives an edge over the other tools when it comes to integration and automation of Microsoft product and technologies.”

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