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  • Google App. Engine for RoR and Python apps

    - by RPK
    I fairly understand that this Q+A site is programmers destination and questions on hosting are not permitted here, but anyone who has heard of Google's App. Engine is well aware that this question is suited for this site only. Google App. Engine supports either Java or Python interpreter. I want to know what type of applications can be hosted on this engine? If my Python or RoR application needs a database behind, will this engine support it? For RoR applications, which interpreter to choose? What are the advantages of Google App.Engine over a local IDE?

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  • Ken Cox explores EF4s Pluralization Service with a WCF Service

    When I have done “what’s new in EF4” talks at user groups and conferences, I like to show off the new pluralization support in the EDM Wizard. I also like to have a little fun showing some cases where it doesn’t do so well. For example, it correctly singularized Breweries to Brewery, but uses the same rule on Movies, turning it to Movy. The wizard uses a runtime feature referred to as the Pluralization Service which you can code against yourself. Ken Cox recently built a WCF...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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  • How to tweet automatically when you push a new package to nuget.org

    - by Daniel Cazzulino
    Wouldn’t it be nice if your followers could be notified whenever you publish a new version of a NuGet package? Currently, nuget.org offers no support for this, but with the following tricks, you can get it working without programming. The essential idea is to use the OData feed that nuget.org exposes to build an RSS feed with new items as you publish them, and have IFTTT do the tweeting from it. The tools we’ll use to get this working are: LinqPad: to examine the nuget.org OData feed at https://nuget.org/api/v2  Yahoo Pipes: to tweak the OData feed output so that it looks like a “plain” feed IFTTT: to consume the pipe output and auto-tweet on new items   Exploring NuGet OData Feed with LinqPad In order to build the query that will become your tweets’ source, we will add a new connection in LinqPad by clicking on the “Add Connection” link:...Read full article

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  • Minidlna Directory Issues

    - by Somnambulist
    I've done my searching and can't find an answer to THIS specific issue. I have my minidlna set up and running - but it's not really done properly. First off, when I open the server on my bluray player, all of my movies are listed twice - when they are certainly not saved on my external twice. Second, when I open the server - rather than reading "Movies" "TV" "Music", etc - It just mashes all of my movies, tv, and some other folders all together with no real organization. I never had this problem when I had my Windows set up, so I know it's something configured improperly more-so than my external drive giving me gruff. Here's my minidlna.conf file: # This is the configuration file for the MiniDLNA daemon, a DLNA/UPnP-AV media # server. # # Unless otherwise noted, the commented out options show their default value. # # On Debian, you can also refer to the minidlna.conf(5) man page for # documentation about this file. media_dir=/media/somnambulist/Ghost In You # This option can be specified more than once if you want multiple directories # scanned. # # If you want to restrict a media_dir to a specific content type, you can # prepend the directory name with a letter representing the type (A, P or V), # followed by a comma, as so: # * "A" for audio (eg. media_dir=A,/var/lib/minidlna/music) # * "P" for pictures (eg. media_dir=P,/var/lib/minidlna/pictures) # * "V" for video (eg. media_dir=V,/var/lib/minidlna/videos) # # WARNING: After changing this option, you need to rebuild the database. Either # run minidlna with the '-R' option, or delete the 'files.db' file # from the db_dir directory (see below). # On Debian, you can run, as root, 'service minidlna force-reload' instead. #media_dir=/var/lib/minidlna media_dir=V,/media/somnambulist/Ghost In You/Movies media_dir=V,/media/somnambulist/Ghost In You/TV media_dir=P,/home/somnambulist/Pictures # Path to the directory that should hold the database and album art cache. db_dir=/home/somnambulist/serverart # Path to the directory that should hold the log file. log_dir=/home/somnambulist/serverlog # Minimum level of importance of messages to be logged. # Must be one of "off", "fatal", "error", "warn", "info" or "debug". # "off" turns of logging entirely, "fatal" is the highest level of importance # and "debug" the lowest. #log_level=warn # Use a different container as the root of the directory tree presented to # clients. The possible values are: # * "." - standard container # * "B" - "Browse Directory" # * "M" - "Music" # * "P" - "Pictures" # * "V" - "Video" # if you specify "B" and client device is audio-only then "Music/Folders" will be used as root root_container=B # Network interface(s) to bind to (e.g. eth0), comma delimited. #network_interface= # IPv4 address to listen on (e.g. 192.0.2.1). #listening_ip= # Port number for HTTP traffic (descriptions, SOAP, media transfer). port=8200 # URL presented to clients. # The default is the IP address of the server on port 80. #presentation_url=http://example.com:80 # Name that the DLNA server presents to clients. friendly_name=Somnambulist Media Server # Serial number the server reports to clients. serial=12345678 # Model name the server reports to clients. #model_name=Windows Media Connect compatible (MiniDLNA) # Model number the server reports to clients. model_number=1 # Automatic discovery of new files in the media_dir directory. #inotify=yes # List of file names to look for when searching for album art. Names should be # delimited with a forward slash ("/"). album_art_names=Cover.jpg/cover.jpg/AlbumArtSmall.jpg/albumartsmall.jpg/AlbumArt.jpg/albumart.jpg/Album.jpg/album.jpg/Folder.jpg/folder.jpg/Thumb.jpg/thumb.jpg # Strictly adhere to DLNA standards. # This allows server-side downscaling of very large JPEG images, which may # decrease JPEG serving performance on (at least) Sony DLNA products. #strict_dlna=no # Support for streaming .jpg and .mp3 files to a TiVo supporting HMO. #enable_tivo=no # Notify interval, in seconds. #notify_interval=895 # Path to the MiniSSDPd socket, for MiniSSDPd support. #minissdpdsocket=/run/minissdpd.sock` And here's the error I get in terminal when I run: sudo service minidlna restart sudo service minidlna force-reload Force restart error: Restarting DLNA/UPnP-AV media server minidlna [2013/08/12 21:19:27] minidlna.c:474: error: Media directory "/media/somnambulist/Ghost In You/Movies" not accessible! [Permission denied] [2013/08/12 21:19:27] minidlna.c:474: error: Media directory "/media/somnambulist/Ghost In You/TV" not accessible! [Permission denied] Force-reload error: Restarting DLNA/UPnP-AV media server minidlna [2013/08/12 21:19:46] minidlna.c:474: error: Media directory "/media/somnambulist/Ghost In You/Movies" not accessible! [Permission denied] [2013/08/12 21:19:46] minidlna.c:474: error: Media directory "/media/somnambulist/Ghost In You/TV" not accessible! [Permission denied] rm: cannot remove ‘/home/somnambulist/serverart/files.db’: Permission denied rm: cannot remove ‘/home/somnambulist/serverart/art_cache/media/somnambulist/Ghost In You/Movies/Slumdog Millionaire/Slumdog.Millionaire.Cover.jpg’: Permission denied rm: cannot remove ‘/home/somnambulist/serverart/art_cache/media/somnambulist/Ghost In You/Movies/Zack and Miri Make a Porno/ZackAndMiriMakeAPornoCover.jpg’: Permission denied [2013/08/12 21:19:46] minidlna.c:744: warn: Failed to clean old file cache. [ OK ] I've spent hours on this at this point, read through various files - and even had a friend who is relatively Ubuntu-savvy try to help me via chat - no such luck. Thanks in advance for any help.

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  • Which SSL do I need?

    - by Maik Klein
    I need to buy a ssl certificate. Now there are so many different alternatives with a huge price range. I know the very basic differences of browser compatibility and security level. But I need a "cheap" ssl certificate. My homepage looks like this http://www.test.com Now if I go to the loginpage i should switch to https like this https:/www.test.com/login I am also considering to secure the whole site if the user has singed in. Now there are sites which are offering SSl for 7$/year. Would this do the job? Or would you recommend me to get something more expensive like this one? I want to add paypal support in a later version of my website and I don't want to save money on the wrong end. What would you recommend me?

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  • Here’s How to Download Windows 8 Release Preview Right Now

    - by The Geek
    Want to get the latest version of Windows 8 right now? This one is called the Release Preview, and it’s available for download right now. There’s a lot of little bugs resolved, the multi-monitor support has improved, and you should download it now. You can grab the regular installer, or you can get the ISO image and use it in a virtual machine. Download Windows 8 Release Preview in ISO format Download the Windows 8 Release Preview Here’s How to Download Windows 8 Release Preview Right Now HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre

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  • Juniper Strategy, LLC is hiring SharePoint Developers&hellip;

    - by Mark Rackley
    Isn’t everybody these days? It seems as though there are definitely more jobs than qualified devs these days, but yes, we are looking for a few good devs to help round out our burgeoning SharePoint team. Juniper Strategy is located in the DC area, however we will consider remote devs for the right fit. This is your chance to get in on the ground floor of a bright company that truly “gets it” when it comes to SharePoint, Project Management, and Information Assurance. We need like-minded people who “get it”, enjoy it, and who are looking for more than just a job. We have government and commercial opportunities as well as our own internal product that has a bright future of its own. Our immediate needs are for SharePoint .NET developers, but feel free to submit your resume for us to keep on file as it looks as though we’ll need several people in the coming months. Please email us your resume and salary requirements to [email protected] Below are our official job postings. Thanks for stopping by, we look forward to  hearing from you. Senior SharePoint .NET Developer Senior developer will focus on design and coding of custom, end-to-end business process solutions within the SharePoint framework. Senior developer with the ability to serve as a senior developer/mentor and manage day-to-day development tasks. Work with business consultants and clients to gather requirements to prepare business functional specifications. Analyze and recommend technical/development alternative paths based on business functional specifications. For selected development path, prepare technical specification and build the solution. Assist project manager with defining development task schedule and level-of-effort. Lead technical solution deployment. Job Requirements Minimum of 7 years experience in agile development, with at least 3 years of SharePoint-related development experience (SPS, SharePoint 2007/2010, WSS2-4). Thorough understanding of and demonstrated experience in development under the SharePoint Object Model, with focus on the WSS 3.0 foundation (MOSS 2007 Standard/Enterprise, Project Server 2007). Experience with using multiple data sources/repositories for database CRUD activities, including relational databases, SAP, Oracle e-Business. Experience with designing and deploying performance-based solutions in SharePoint for business processes that involve a very large number of records. Experience designing dynamic dashboards and mashups with data from multiple sources (internal to SharePoint as well as from external sources). Experience designing custom forms to facilitate user data entry, both with and without leveraging Forms Services. Experience building custom web part solutions. Experience with designing custom solutions for processing underlying business logic requirements including, but not limited to, SQL stored procedures, C#/ASP.Net workflows/event handlers (including timer jobs) to support multi-tiered decision trees and associated computations. Ability to create complex solution packages for deployment (e.g., feature-stapled site definitions). Must have impeccable communication skills, both written and verbal. Seeking a "tinkerer"; proactive with a thirst for knowledge (and a sense of humor). A US Citizen is required, and need to be able to pass NAC/E-Verify. An active Secret clearance is preferred. Applicants must pass a skills assessment test. MCP/MCTS or comparable certification preferred. Salary & Travel Negotiable SharePoint Project Lead Define project task schedule, work breakdown structure and level-of-effort. Serve as principal liaison to the customer to manage deliverables and expectations. Day-to-day project and team management, including preparation and maintenance of project plans, budgets, and status reports. Prepare technical briefings and presentation decks, provide briefs to C-level stakeholders. Work with business consultants and clients to gather requirements to prepare business functional specifications. Analyze and recommend technical/development alternative paths based on business functional specifications. The SharePoint Project Lead will be working with SharePoint architects and system owners to perform requirements/gap analysis and develop the underlying functional specifications. Once we have functional specifications as close to "final" as possible, the Project Lead will be responsible for preparation of the associated technical specification/development blueprint, along with assistance in preparing IV&V/test plan materials with support from other team members. This person will also be responsible for day-to-day management of "developers", but is also expected to engage in development directly as needed.  Job Requirements Minimum 8 years of technology project management across the software development life-cycle, with a minimum of 3 years of project management relating specifically to SharePoint (SPS 2003, SharePoint2007/2010) and/or Project Server. Thorough understanding of and demonstrated experience in development under the SharePoint Object Model, with focus on the WSS 3.0 foundation (MOSS 2007 Standard/Enterprise, Project Server 2007). Ability to interact and collaborate effectively with team members and stakeholders of different skill sets, personalities and needs. General "development" skill set required is a fundamental understanding of MOSS 2007 Enterprise, SP1/SP2, from the top-level of skinning to the core of the SharePoint object model. Impeccable communication skills, both written and verbal, and a sense of humor are required. The projects will require being at a client site at least 50% of the time in Washington DC (NW DC) and Maryland (near Suitland). A US Citizen is required, and need to be able to pass NAC/E-Verify. An active Secret clearance is preferred. PMP certification, PgMP preferred. Salary & Travel Negotiable

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  • Have Fun with Mozilla Firefox’s Spark and Ember Paper Toys [Geek Project]

    - by Asian Angel
    Are you looking for a fun paper-craft project to work on while showing your support for Mozilla Firefox? Then you will enjoy the Spark and Ember paper toys that the folks from the Mozilla Indonesia community have put together. Each comes in an easy to print three page PDF file for easy storage and sharing with friends. Photo courtesy of Mozilla Blog Indonesia. Download the Spark Paper Toy Download the Ember Paper Toy [via Mozilla Blog Indonesia] What is a Histogram, and How Can I Use it to Improve My Photos?How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is Compromised

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  • Messaging Systems – Handshaking, Reconciliation and Tracking for Data Transparency

    - by Ahsan Alam
    As many corporations build business partnerships with other organizations, the need to share information becomes necessary. Large amount of data sharing using snail mail, email and/or fax are quickly becoming a thing of the past. More and more organizations are relying heavily on Ftp and/or Web Service to exchange data. Corporations apply wide range of technologies and techniques based on available resources and data transfer needs. Sometimes, it involves simple home-grown applications. Other times, large investments are made on products like BizTalk, TIBCO etc. Complexity of information management also varies significantly from one organizations to another. Some may deal with handful of simple steps to process and manage shared data; whereas others may rely on fairly complex processes with heavy interaction with internal and external systems in order to serve the business needs. It is not surprising that many of these systems end up becoming black boxes over a period of time. Consequently, people and business start to rely more and more on developers and support personnel just to extract simple information adding to the loss of productivity. One of the most important factor in any business is transparency to data irrespective of technology preferences and the complexity of business processes. Not knowing the state of data could become very costly to the business. Being involved in messaging systems for some time now, I have heard the same type of questions over and over again. Did we transmit messages successfully? Did we get responses back? What is the expected turn-around-time? Did the system experience any errors? When one company transmits data to one or more company, it may invoke a set of processes that could complete in matter of seconds, or it could days. As data travels from one organizations to another, the uncertainty grows, and the longer it takes to track uncertain state of the data the costlier it gets for the business, So, in every business scenario, it's extremely important to be aware of the state of the data.   Architects of messaging systems can take several steps to aid with data transparency. Some forms of data handshaking and reconciliation mechanism as well as extensive data tracking can be incorporated into the system to provide clear visibility to the data. What do I mean by handshaking and reconciliation? Some might consider these to be a single concept; however, I like to consider them in two unique categories. Handshaking serves as message receipts or acknowledgment. When one transmits messages to another, the receiver must acknowledge each message by sending immediate responses for each transaction. Whenever we use Web Services, handshaking is often achieved utilizing request/reply pattern. Similarly, if Ftp is used, a receiver can acknowledge by dropping messages for the sender as soon as the files are picked up. These forms of handshaking or acknowledgment informs the message sender and receiver that a successful transaction has occurred. I have mentioned earlier that it could take anywhere from a few seconds to a number of days before shared data is completely processed. In addition, whenever a batched transaction is used, processing time for each data element inside the batch could also vary significantly. So, in order to successfully manage data processing, reconciliation becomes extremely important; otherwise it may result into data loss or in some cases hefty penalty. Reconciliation can be done in many ways. Partner organizations can share and compare ad hoc reports to achieve reconciliation. On the other hand, partners can agree on some type of systematic reconciliation messages. Systems within responsible parties can trigger messages to partners as soon as the data process completes.   Next step in the data transparency is extensive data tracking. Some products such as BizTalk and TIBCO provide built-in functionality for data tracking; however, built-in functionality may not always be adequate. Sometimes additional tracking system (or databases) needs to be built in order monitor all types of data flow including, message transactions, handshaking, reconciliation, system errors and many more. If these types of data are captured, then these can be presented to business users in any forms or fashion. When business users are empowered with such information, then the reliance on developers and support teams decreases dramatically.   In today's collaborative world of information sharing, data transparency is key to the success of every business. The state of business data will constantly change. However, when people have easier access to various states of data, it allows them to make better and quicker decisions. Therefore, I feel that data handshaking, reconciliation and tracking is very important aspect of messaging systems.

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  • VS 2010 SP1 BETA – App.config XML Transformation Fix

    - by João Angelo
    The current version for App.config XML tranformations as described in a previous post does not support the SP1 BETA version of Visual Studio. I did some quick tests and decided to provide a different version with a compatibility fix for those already experimenting with the beta release of the service pack. This is a quick workaround to the build errors I found when using the transformations in SP1 beta and is pretty much untested since I’ll wait for the final release of the service pack to take a closer look to any possible problems. But for now, those that already installed SP1 beta can use the following transformations: VS 2010 SP1 BETA – App.config XML Transformation And those with the RTM release of Visual Studio can continue to use the original version of the transformations available from: VS 2010 RTM – App.config XML Transformation

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  • Role Center Installation for IIS Default Feature XPS-VIEWER

    - by ssmantha
    While installing Dynamics Ax 2009 Roles Center and Enterprise Portal on Windows Server 2008 R2, there is a prerequisite for IIS Default components which fails to install. The error log file for IIS component installation points to an error while installing feature NET-XPS-VIEWER. This issue can be resolved by editing “ServerManagerCmdInputIIS.xml” file present in the support folder of the DAX 2009 installer. Edit the entry “<Feature Id="NET-XPS-Viewer" />” to “<Feature Id="NET-XPS-Viewer" />” and try reinstalling the installer should now continue uninterrupted. The issue is due to the feature name which is now XPS-VIEWER in windows server 2008 R2. Happy Installing!! :-)

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  • Is there a expected set of button mappings games commonly use?

    - by Scott Chamberlain
    I am making a game that will support a XBox 360 controller but I would like to try and keep the default button mappings to be what is expected from a user's past history from playing other games. Is there a set of guidelines from Microsoft on what should map to what (Do you use A for fire or left trigger?), or has the gaming community picked up a common set of controls that is just not written anywhere, everyone just "knows" it (like WASD for movement). The hardest thing for me is I have walking movement, vehicle movement, and airplane movement. I plan on allowing custom configuration of each, but I don't know what to set as the defaults.

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  • Performance Gains using Indexed Views and Computed Columns

    - by NeilHambly
    Hello This is a quick follow-up blog to the Presention I gave last night @ the London UG Meeting ( 17th March 2010 ) It was a great evening and we had a big full house (over 120 Registered for this event), due to time constraints we had I was unable to spend enough time on this topic to really give it justice or any the myriad of questions that arose form the session, I will be gathering all my material and putting a comprehensive BLOG entry on this topic in the next couple of days.. In the meantime here is the slides from last night if you wanted to again review it or if you where not @ the meeting If you wish to contact me then please feel free to send me emails @ [email protected] Finally  - a quick thanks to Tony Rogerson for allowing me to be a Presenter last night (so we know who we can blame !)  and all the other presenters for thier support Watch this space Folks more to follow soon.. 

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  • Blackberry OS 7.1 ouvre BBM aux développeurs pour « créer de la viralité » autour de leurs applications, des API pour le NFC

    Blackberry OS 7.1 ouvre BBM aux développeurs Pour « créer de la viralité» autour de leurs applications, des API pour le NFC Research In Motion ne va pas bien financièrement, mais RIM n'est pas mort pour autant. L'annonce de la version 7.1 de son BlackBerry OS montre en effet que le canadien est toujours prêt à se battre. Comment ? En étant toujours une référence pour les professionnels (support de tout type de messagerie, de protocoles et d'outils ? d'Exchange à SAP en passant par Lync de Microsoft ou les technologies de Cisco) et en donnant de nouveaux outils aux développeurs. [IMG]http://ftp-developpez.com/gordon-fowler/BBPlateforme.png[/IMG] RIM a par exemple fai...

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  • Good, free isometric game engine?

    - by posfan12
    Any recommendations for a good isometric game engine that is also free? Should be possible to develop entirely using freely available tools (meaning: no Flash, and no I don't want to learn haXe...) Works-in-a-browser is a plus, but not required. Support for 32-bit images is required! Good performance. Excellent documentation. I have looked at FIFE but it is still too unfinished, and the documentation sucks! Thanks!

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  • Wireless driver - how to load manufacturer's STA file (Ralink 3290)

    - by Matt
    Caution: I'm a newb. Hardware: Giada i35G, cedar trail atom with nvidia gf119, railtek ethernet and Ralink 3290 for wireless. Already accomplished: Installed Ubuntu 12.10, loaded GPU drivers and redirected sound out through GPU card to HDMI. Ethernet works like a charm. Issue: Can't get my wireless up and running. There seems to be no package to which I can simply run a sudo get-aspt install ... I found the corresponding Linux driver from the manufacturer's site, but I have not managed to find out what to with the file. Here's the manufacturers site: http://www.ralinktech.com/en/04_support/support.php?sn=501 I get a file with the following name: \2012_0508_RT3290_Linux_STA_v2.6.0.0.bz2 I hope somebody might be able to tell me what to do next. Thanks for reading and apologies for potentially asking a trivial question. Best regards, Matt

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  • Lightweight PHP/HTML/CSS editor with code browser

    - by Nisto
    I'm looking for a freeware editor which has; syntax highlighting and a code browser (or code suggestions/hints). Preferably freeware license! I've tried out quite a few editors, but a lot of them are unfortunately very resource heavy and provides a lot more functions than I ever needed. So far, there's two editors that I really like, and is lightweight: jEdit and Notepad++. Although, unfortunately... Notepad++ doesn't have code browser support for both control structures and functions for PHP. Also, there's no code browser for HTML... I really liked jEdit as well, but there doesn't seem to be a code browser for it. Except for maybe Completion, but it's a bothersome plugin, and doesn't show the code browser unless you type something in and press CTRL+B. Other editors I've tried, but wasn't satisfied with: Adobe Dreamweaver CodeLobster PHP Edition Aptana Studio Komodo Edit EditPlus BlueFish PHP Designer 2007 - Personal PhpStorm Scriptly Eclipse UltraEdit Notepad2 EditPad Pro Rapid PHP EDIT I'm using Windows XP

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  • JavaScript Intellisense Improvements with VS 2010

    This is the twentieth in a series of blog posts Im doing on the upcoming VS 2010 and .NET 4 release.  Todays blog post covers some of the nice improvements coming with JavaScript intellisense with VS 2010 and the free Visual Web Developer 2010 Express.  Youll find with VS 2010 that JavaScript Intellisense loads much faster for large script files and with large libraries, and that it now provides statement completion support for more advanced scenarios compared to previous versions...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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  • Shader effect similar to Metro 2033 gasmask

    - by Tim
    I was thinking about effects in games the other day and I was reminded of the Gasmask effect from Metro 2033. Once you put the gasmask on it blurred a bit in the corners and could ice up and even get cracked. I assume that something like that is done using a shader. I have been experimenting a bit with game development, so far mostly playing with existing rendering engines and adding physics support etc. I would like to learn more about this sort of effect. Can someone give me a simple example of a shader that would alter the entire scene like this. Or if not a shader then an idea on how it would be done. Thanks. Edit : Include screenshot of the metro 2033 gasmask effect.

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  • JavaScript Class Patterns

    - by Liam McLennan
    To write object-oriented programs we need objects, and likely lots of them. JavaScript makes it easy to create objects: var liam = { name: "Liam", age: Number.MAX_VALUE }; But JavaScript does not provide an easy way to create similar objects. Most object-oriented languages include the idea of a class, which is a template for creating objects of the same type. From one class many similar objects can be instantiated. Many patterns have been proposed to address the absence of a class concept in JavaScript. This post will compare and contrast the most significant of them. Simple Constructor Functions Classes may be missing but JavaScript does support special constructor functions. By prefixing a call to a constructor function with the ‘new’ keyword we can tell the JavaScript runtime that we want the function to behave like a constructor and instantiate a new object containing the members defined by that function. Within a constructor function the ‘this’ keyword references the new object being created -  so a basic constructor function might be: function Person(name, age) { this.name = name; this.age = age; this.toString = function() { return this.name + " is " + age + " years old."; }; } var john = new Person("John Galt", 50); console.log(john.toString()); Note that by convention the name of a constructor function is always written in Pascal Case (the first letter of each word is capital). This is to distinguish between constructor functions and other functions. It is important that constructor functions be called with the ‘new’ keyword and that not constructor functions are not. There are two problems with the pattern constructor function pattern shown above: It makes inheritance difficult The toString() function is redefined for each new object created by the Person constructor. This is sub-optimal because the function should be shared between all of the instances of the Person type. Constructor Functions with a Prototype JavaScript functions have a special property called prototype. When an object is created by calling a JavaScript constructor all of the properties of the constructor’s prototype become available to the new object. In this way many Person objects can be created that can access the same prototype. An improved version of the above example can be written: function Person(name, age) { this.name = name; this.age = age; } Person.prototype = { toString: function() { return this.name + " is " + this.age + " years old."; } }; var john = new Person("John Galt", 50); console.log(john.toString()); In this version a single instance of the toString() function will now be shared between all Person objects. Private Members The short version is: there aren’t any. If a variable is defined, with the var keyword, within the constructor function then its scope is that function. Other functions defined within the constructor function will be able to access the private variable, but anything defined outside the constructor (such as functions on the prototype property) won’t have access to the private variable. Any variables defined on the constructor are automatically public. Some people solve this problem by prefixing properties with an underscore and then not calling those properties by convention. function Person(name, age) { this.name = name; this.age = age; } Person.prototype = { _getName: function() { return this.name; }, toString: function() { return this._getName() + " is " + this.age + " years old."; } }; var john = new Person("John Galt", 50); console.log(john.toString()); Note that the _getName() function is only private by convention – it is in fact a public function. Functional Object Construction Because of the weirdness involved in using constructor functions some JavaScript developers prefer to eschew them completely. They theorize that it is better to work with JavaScript’s functional nature than to try and force it to behave like a traditional class-oriented language. When using the functional approach objects are created by returning them from a factory function. An excellent side effect of this pattern is that variables defined with the factory function are accessible to the new object (due to closure) but are inaccessible from anywhere else. The Person example implemented using the functional object construction pattern is: var personFactory = function(name, age) { var privateVar = 7; return { toString: function() { return name + " is " + age * privateVar / privateVar + " years old."; } }; }; var john2 = personFactory("John Lennon", 40); console.log(john2.toString()); Note that the ‘new’ keyword is not used for this pattern, and that the toString() function has access to the name, age and privateVar variables because of closure. This pattern can be extended to provide inheritance and, unlike the constructor function pattern, it supports private variables. However, when working with JavaScript code bases you will find that the constructor function is more common – probably because it is a better approximation of mainstream class oriented languages like C# and Java. Inheritance Both of the above patterns can support inheritance but for now, favour composition over inheritance. Summary When JavaScript code exceeds simple browser automation object orientation can provide a powerful paradigm for controlling complexity. Both of the patterns presented in this article work – the choice is a matter of style. Only one question still remains; who is John Galt?

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  • JavaScript Class Patterns

    - by Liam McLennan
    To write object-oriented programs we need objects, and likely lots of them. JavaScript makes it easy to create objects: var liam = { name: "Liam", age: Number.MAX_VALUE }; But JavaScript does not provide an easy way to create similar objects. Most object-oriented languages include the idea of a class, which is a template for creating objects of the same type. From one class many similar objects can be instantiated. Many patterns have been proposed to address the absence of a class concept in JavaScript. This post will compare and contrast the most significant of them. Simple Constructor Functions Classes may be missing but JavaScript does support special constructor functions. By prefixing a call to a constructor function with the ‘new’ keyword we can tell the JavaScript runtime that we want the function to behave like a constructor and instantiate a new object containing the members defined by that function. Within a constructor function the ‘this’ keyword references the new object being created -  so a basic constructor function might be: function Person(name, age) { this.name = name; this.age = age; this.toString = function() { return this.name + " is " + age + " years old."; }; } var john = new Person("John Galt", 50); console.log(john.toString()); Note that by convention the name of a constructor function is always written in Pascal Case (the first letter of each word is capital). This is to distinguish between constructor functions and other functions. It is important that constructor functions be called with the ‘new’ keyword and that not constructor functions are not. There are two problems with the pattern constructor function pattern shown above: It makes inheritance difficult The toString() function is redefined for each new object created by the Person constructor. This is sub-optimal because the function should be shared between all of the instances of the Person type. Constructor Functions with a Prototype JavaScript functions have a special property called prototype. When an object is created by calling a JavaScript constructor all of the properties of the constructor’s prototype become available to the new object. In this way many Person objects can be created that can access the same prototype. An improved version of the above example can be written: function Person(name, age) { this.name = name; this.age = age; } Person.prototype = { toString: function() { return this.name + " is " + this.age + " years old."; } }; var john = new Person("John Galt", 50); console.log(john.toString()); In this version a single instance of the toString() function will now be shared between all Person objects. Private Members The short version is: there aren’t any. If a variable is defined, with the var keyword, within the constructor function then its scope is that function. Other functions defined within the constructor function will be able to access the private variable, but anything defined outside the constructor (such as functions on the prototype property) won’t have access to the private variable. Any variables defined on the constructor are automatically public. Some people solve this problem by prefixing properties with an underscore and then not calling those properties by convention. function Person(name, age) { this.name = name; this.age = age; } Person.prototype = { _getName: function() { return this.name; }, toString: function() { return this._getName() + " is " + this.age + " years old."; } }; var john = new Person("John Galt", 50); console.log(john.toString()); Note that the _getName() function is only private by convention – it is in fact a public function. Functional Object Construction Because of the weirdness involved in using constructor functions some JavaScript developers prefer to eschew them completely. They theorize that it is better to work with JavaScript’s functional nature than to try and force it to behave like a traditional class-oriented language. When using the functional approach objects are created by returning them from a factory function. An excellent side effect of this pattern is that variables defined with the factory function are accessible to the new object (due to closure) but are inaccessible from anywhere else. The Person example implemented using the functional object construction pattern is: var john = new Person("John Galt", 50); console.log(john.toString()); var personFactory = function(name, age) { var privateVar = 7; return { toString: function() { return name + " is " + age * privateVar / privateVar + " years old."; } }; }; var john2 = personFactory("John Lennon", 40); console.log(john2.toString()); Note that the ‘new’ keyword is not used for this pattern, and that the toString() function has access to the name, age and privateVar variables because of closure. This pattern can be extended to provide inheritance and, unlike the constructor function pattern, it supports private variables. However, when working with JavaScript code bases you will find that the constructor function is more common – probably because it is a better approximation of mainstream class oriented languages like C# and Java. Inheritance Both of the above patterns can support inheritance but for now, favour composition over inheritance. Summary When JavaScript code exceeds simple browser automation object orientation can provide a powerful paradigm for controlling complexity. Both of the patterns presented in this article work – the choice is a matter of style. Only one question still remains; who is John Galt?

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  • Powershell STA watin

    - by Mike Koerner
    Wow, two posts on the same day. I was working on a quick DLL project to do some web scripting using the awsome power of Watin.  In the past I use to create a vbscript as the test handler to call the DLL but lately I got a Powershell bug to call .NET DLLs. When I tried to debug the Watin call I received: The CurrentThread needs to have it's ApartmentState set to ApartmentState.STA to be able to automate Internet Explorer. I couldn't find a quick google answer to powershell apartmentstate .  Apparently you can set the powershell apartment state by the command line -STA.  http://technet.microsoft.com/en-us/library/dd315276.aspx I've found that the powershell documentation and examples is lacking compared to the Microsoft support I've come to expect.  Why is the Powershell v2.0 in C:\WINDOWS\SYSTEM32\windowspowershell\v1.0 ?

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  • SonicFileFinder 2.2 Released

    My colleague Jens Schaller has released a new version of his free Visual Studio add-in SonicFileFinder, adding support for Visual Studio 2010. Announcement on his blog Download on the SonicFileFinder website As far as I can tell, there are no new features compared to version 2.1, but good to know that this add-in is now available for VS2010. For those who a wondering what SonicFileFinder is about: SonicFileFinder implements a command for searching and opening files in a Visual Studio solution,...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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  • Version control and project management for freelancing jobs

    - by Groo
    Are there version control and project management tools which "work well" with freelancing jobs, if I want to keep my customer involved in the project at all times? What concerns me is that repository hosting providers have their fees based on the "number of users", which I feel is the number which will constantly increase as I finish one project after another. For each project, for example, I would have to add permissions to my contractor to allow him to pull the source code and collaborate. So how does that work in practice? Do I "remove" the contractor from the project once it's done? This means I basically state that I offer no support and bugfixes anymore. Or do freelances end up paying more and more money for these services? Do you use such online services, or you host them by yourself? Or do you simply send your code to your customer by e-mail in weekly iterations?

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  • SQLAuthority News – SQL Server 2008 R2 Update for Developers Training Kit – Download – May Update

    - by pinaldave
    I often receive the question what is the quickest way to learn SQL Server 2008 R2. Microsoft have published developers training kit which one can download and learn at your own pace, it has tutorials, videos, and hands-on lab which one can practice. This training kit has been published earlier and has been refreshed in May 2011. The May 2011 update provides support for Windows 7 SP1, Windows Server 2008 R2 SP1 and Visual Studio 2010 SP1. Additionally, any demos or hands-on labs that no longer have a Visual Studio 2008 dependency were updated to Visual Studio 2010. The training kit is divided into four sections: Getting Started (for Web and BI developers who are new to SQL Server) SQL Server 2008 (for experienced SQL Server developers who want to understand what’s new in 2008) SQL Server 2008 R2 (for experienced SQL Server developers who want to understand what’s new in 2008 R2) Office 2010 (for experienced BI developers who want to understand what’s new in 2008 R2 and Office 2010) SQL Server 2008 R2 Update for Developers Training Kit Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Documentation, SQL Download, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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