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  • How do you keep track of the authors of code?

    - by dustyprogrammer
    This is something I was never taught. I have seen alot of different types of authoring styles. I code primarily in Java and Python. I was wondering if there was a standard authoring style or if everything is freestyle. Also if you answer would you mind attaching the style you use to author files that your create at home or at work. I usually just go @author garbagecollector @company garbage inc.

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  • When is it reasonable to create my own programming language?

    - by Daniel Rikowski
    Are there types of killer applications, classes of algorithmic problems, etc., where it is better, in the long run, to create my own language? PS: Just to be sure, I mean a new programming language and a compiler, not a new compiler for an existing language. EDIT: Thank you for the answers. Can you provide some examples, where it is absolutly unnecessary to create a DSL or cases in which a DSL might be a good idea?

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  • Spatial data from shapefiles (for T-SQL Tuesday #006)

    - by Rob Farley
    I’m giving a presentation on May 12th at the Adelaide .Net User Group, around the topic of spatial data, and in particular, the visualization of said data. Given that it’s about one the larger types, this post should also count towards Michael Coles’ T-SQL Tuesday on BLOB data . I wrote recently about my experience with exploded data , but what I didn’t go on to talk about was how using a shapefile like this would translate into a scenario with a much larger number of shapes, such as all the postcode...(read more)

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  • Passing data between the VirtualBox Host and the Guest

    - by Fat Bloke
    Here's a good question: "How can you figure out the VM name from within the VM itself?" While this data is not automatically available, the general purpose, and very powerful VirtualBox "GuestProperty" APIs can be used from the host and guest to pass arbitrary data, in key/value pairs format, in and out of the guest. Note that this does require that the VirtualBox Guest Additions have been installed in the guest. To play with this, try using the "VBoxManage" command line on your VirtualBox host machine, and "VBoxControl" in the guest. Host syntax VBoxManage guestproperty get <vmname>|<uuid> <property> [--verbose] VBoxManage guestproperty set <vmname>|<uuid> <property> [<value> [--flags <flags>]] VBoxManage guestproperty enumerate <vmname>|<uuid> [--patterns <patterns>] VBoxManage guestproperty wait <vmname>|<uuid> <patterns> [--timeout <msec>] [--fail-on-timeout]   Guest syntax VBoxControl.exe guestproperty        get <property> [-verbose] VBoxControl.exe guestproperty        set <property> [<value> [-flags <flags>]] VBoxControl.exe guestproperty        enumerate [-patterns <patterns>] VBoxControl.exe guestproperty        wait <patterns>                                      [-timestamp <last timestamp>]                                      [-timeout <timeout in ms>  So to solve our problem above, we set the vm name in the Host system on an arbitrary key like this: $ VBoxManage guestproperty set "Windows 7 (x64)" /MyData/VMname "Windows 7 (x64)" And within the guest we can use: C:\Program Files\Oracle\VirtualBox Guest Additions>VBoxControl.exe guestproperty get /MyData/VMname Oracle VM VirtualBox Guest Additions Command Line Management Interface Version 4.1.14 (C) 2008-2012 Oracle Corporation All rights reserved. Value: Windows 7 (x64) The GuestProperty API is pretty powerful, so for the interested, get more info in the User Manual. - FB 

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  • Silverlight IConvertible TypeConverter

    - by codingbloke
    I recently answered the following question on stackoverflow:  Silverlight 3 custom control: only ‘int’ as numeric type for a property? [e.g. long or int64 seems to break] I quickly knocked up the class ConvertibleTypeConverter<T> that I posted in the question (listed later here as well). Afterward I fully expected to find that of the usual clever “bods who blog” to have covered this probably with a better solution than I.  So far though I’ve not found one so I thought I’d blog it myself. The Problem Here is a classic gotcha I’ve seen asked more than once on stackoverflow :- public class MyClass {     public float SomeValue { get; set; } } <local:MyClass SomeValue="45.15" /> This fails with the error  “Failed to create a 'System.Single' from the text '45.15'”  and results in much premature hair loss.  Fortunately this is SL4, in SL3 the error message is almost meaningless.  So what gives, how can it be that this fails when we can see other very similar values parsing happily all over the place? It comes down the fact that the Xaml parser only handles a few of the primitive data types namely: bool, int, string and double.  Since the parser has no idea how to convert a string to a float we get the above error. The Solution The sensible solution is “use double not float” but lets not dwell on that, there has to be occasions where such an answer isn’t acceptable. In order to achieve parsing of other types we need an implementation of TypeConverter for the type of the property and then we need to use the TypeConverterAttribute to decorate the property .  As an example the Silverlight SDK provides one for DateTime the DateTimeTypeConverter (yes I know DateTime isn’t really a primitive). The following class will parse in Xaml:- public class MyClass {     [TypeConverter(typeof(DateTimeTypeConverter))]     public DateTime SomeValue {get; set; } } So far though we would need to create a TypeConverter for each primitive type we are using, what if I had the following mad class to support in Xaml:- public class StrangePrimitives {     public Boolean BooleanProp { get; set; }     public Byte ByteProp { get; set; }     public Char CharProp { get; set; }     public DateTime DateTimeProp { get; set; }     public Decimal DecimalProp { get; set; }     public Double DoubleProp { get; set; }     public Int16 Int16Prop { get; set; }     public Int32 Int32Prop { get; set; }     public Int64 Int64Prop { get; set; }     public SByte SByteProp { get; set; }     public Single SingleProp { get; set; }     public String StringProp { get; set; }     public UInt16 UInt16Prop { get; set; }     public UInt32 UInt32Prop { get; set; }     public UInt64 UInt64Prop { get; set; } } Then I want to fill an instance of StrangePrimitives with the following Xaml which of course fails. <local:StrangePrimitives x:Key="MyStrangePrimitives"                          BooleanProp="True"                          ByteProp="156"                          CharProp="A"                          DateTimeProp="06 Jun 2010"                          DecimalProp="123.56"                          DoubleProp="8372.937803"                          Int16Prop="16532"                          Int32Prop="73738248"                          Int64Prop="12345678909298"                          SByteProp="-123"                          SingleProp="39.0"                          StringProp="Hello, World!"                          UInt16Prop="40000"                          UInt32Prop="4294967295"                          UInt64Prop="18446744073709551615"      /> I got to thinking, though, one thing all these primitive types have in common is that they all implement IConvertible so it should be possible to write just one converter to handle them all.  Here it is:- The ConvertibleTypeConverter public class ConvertibleTypeConverter<T> : TypeConverter where T : IConvertible {     public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)     {         return sourceType.GetInterface("IConvertible", false) != null;     }     public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)     {         return destinationType.GetInterface("IConvertible", false) != null;     }     public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)     {         return ((IConvertible)value).ToType(typeof(T), culture);     }     public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)     {         return ((IConvertible)value).ToType(destinationType, culture);     } } I won’t bore you with an explanation of how it works, it simply adapts one existing interface (the IConvertible) and exposes it as another (the TypeConverter).   With that in place the previous strange primitives class can be modified as:- public class StrangePrimitives {     public Boolean BooleanProp { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<Byte>))]     public Byte ByteProp { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<Char>))]     public Char CharProp { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<DateTime>))]     public DateTime DateTimeProp { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<Decimal>))]     public Decimal DecimalProp { get; set; }     public Double DoubleProp {get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<Int16>))]     public Int16 Int16Prop { get; set; }     public Int32 Int32Prop { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<Int64>))]     public Int64 Int64Prop { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<SByte>))]     public SByte SByteProp { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<Single>))]     public Single SingleProp { get; set; }     public String StringProp { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<UInt16>))]     public UInt16 UInt16Prop { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<UInt32>))]     public UInt32 UInt32Prop { get; set; }     [TypeConverter(typeof(ConvertibleTypeConverter<UInt64>))]     public UInt64 UInt64Prop { get; set; } } This results in the previous Xaml parsing happily.  Now it seems such an obvious thing to do that one may wonder why such a class doesn’t already existing in Silverlight or at least in the SDK.   I would not be surprised if there were some very good reasons hence use the ConvertibleTypeConverter with caution.  It does seem to me to be a useful little class to have lying around in the toolbox for the odd occasion where it may be needed.

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  • What should I wear to a job interview with a game development company?

    - by Bill
    Many game development companies are less formal in terms of workplace attire than other types of software development houses. For example, I know that one place at which I will be interviewing soon has a predominant workplace culture of jeans and polos or t-shirts. Should I wear a suit? Shirt and tie? Shirt and sport jacket, with or without tie? I want to show that I'm serious about the job, but that I understand the culture, too.

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  • Do I need "cube subclasses" to represent the blocks in a Minecraft-like world?

    - by stighy
    I would like to try to develop a very simple game like Minecraft for my own education. My main problem at the moment is figuring out how to model classes that represent the world, which will be made of blocks of various types (such as dirt, stone and sand). I am thinking of creating the following class structure: Cube (with proprerties like color, strength, flammable, gravity) with subclasses: Dirt Stone Sand et cetera My question is, do I need the Cube subclasses or a single class Cube sufficient?

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  • Google I/O 2012 - Knowledge-Based Application Design Patterns

    Google I/O 2012 - Knowledge-Based Application Design Patterns Shawn Simister In this talk we'll look at emerging design patterns for building web applications that take advantage of large-scale, structured data. We'll look at open datasets like Wikipedia and Freebase as well as structured markup like Schema.org and RDFa to see what new types of applications these technologies open up for developers. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 1 0 ratings Time: 56:55 More in Science & Technology

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  • Has a multi player graphic adventure* ever been made?

    - by Petruza
    By graphic adventure, I mean point & click LucasArts-type games. Those games have a mostly linear structure in nature, and usually don't offer as many variants as other games types like action, rpg, strategy, which makes this genre difficult to implement a multi-player feature. I'd like to know if there has been any attempts on doing such a thing, and if it would be viable, as players going offline or leaving a game in the middle would affect significantly the other players' game.

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  • Undocumented Query Plans: The ANY Aggregate

    - by Paul White
    As usual, here’s a sample table: With some sample data: And an index that will be useful shortly: There’s a complete script to create the table and add the data at the end of this post.  There’s nothing special about the table or the data (except that I wanted to have some fun with values and data types). The Task We are asked to return distinct values of col1 and col2 , together with any one value from the thing column (it doesn’t matter which) per group.  One possible result set is shown...(read more)

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  • BizTalk 2009 Orchestration Fails to Find References on External Assemblies

    - by Shawn Cicoria
    If you’re developing BizTalk 2009 solutions (Orchestrations) and you’ve split your schemas out into alternative assemblies (projects) – sometimes you’ll get odd not found issues with some (if not all) of the types in those referenced assemblies.  You can try everything – recompile, de-gac, re-gac, – doesn’t matter. Well there’s a hotfix for this: http://support.microsoft.com/kb/977428/en-us FIX: You experience various problems when you develop a BizTalk project that references another BizTalk project in Visual Studio on a computer that is running BizTalk Server 2009

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  • What programming language(s) could I develop this app with for an iPhone

    - by Keon Davies
    The app I'm thinking of making would be little similar to fruit ninja. The app/ game would involve different types of animals flying straight at and you have to choose the right item to catch the animal before he gets to you. For example to capture a fish you would have to select the net and then click on the fish to capture it. Also I would like to have a leader board too. Which programming language(s) could I use to develop what I just described?

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  • Lightweight Projectors That Pack A Punch

    Lightweight projectors are made for people on the go. If you need to make presentations in a variety of locations, then a lightweight LCD or DLP projector is a must for you. There are several types o... [Author: Danny Davidson - Computers and Internet - May 23, 2010]

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  • Single use download script - Modification [on hold]

    - by Iulius
    I have this Single use download script! This contain 3 php files: page.php , generate.php and variables.php. Page.php Code: <?php include("variables.php"); $key = trim($_SERVER['QUERY_STRING']); $keys = file('keys/keys'); $match = false; foreach($keys as &$one) { if(rtrim($one)==$key) { $match = true; $one = ''; } } file_put_contents('keys/keys',$keys); if($match !== false) { $contenttype = CONTENT_TYPE; $filename = SUGGESTED_FILENAME; readfile(PROTECTED_DOWNLOAD); exit; } else { ?> <html> <head> <meta http-equiv="refresh" content="1; url=http://docs.google.com/"> <title>Loading, please wait ...</title> </head> <body> Loading, please wait ... </body> </html> <?php } ?> Generate.php Code: <?php include("variables.php"); $password = trim($_SERVER['QUERY_STRING']); if($password == ADMIN_PASSWORD) { $new = uniqid('key',TRUE); if(!is_dir('keys')) { mkdir('keys'); $file = fopen('keys/.htaccess','w'); fwrite($file,"Order allow,deny\nDeny from all"); fclose($file); } $file = fopen('keys/keys','a'); fwrite($file,"{$new}\n"); fclose($file); ?> <html> <head> <title>Page created</title> <style> nl { font-family: monospace } </style> </head> <body> <h1>Page key created</h1> Your new single-use page link:<br> <nl> <?php echo "http://" . $_SERVER['HTTP_HOST'] . DOWNLOAD_PATH . "?" . $new; ?></nl> </body> </html> <?php } else { header("HTTP/1.0 404 Not Found"); } ?> And the last one Variables.php Code: <? define('PROTECTED_DOWNLOAD','download.php'); define('DOWNLOAD_PATH','/.work/page.php'); define('SUGGESTED_FILENAME','download-doc.php'); define('ADMIN_PASSWORD','1234'); define('EXPIRATION_DATE', '+36 hours'); header("Cache-Control: no-cache, must-revalidate"); header("Expires: ".date('U', strtotime(EXPIRATION_DATE))); ?> The http://www.site.com/generate.php?1234 will generate a unique link like page.php?key1234567890. This link page.php?key1234567890 will be sent by email to my user. Now how can I generate a link like this page.php?key1234567890&[email protected] ? So I think I must access the generator page like this generate.php?1234&[email protected] . P.S. This variable will be posted on the download page by "Hello, " I tried everthing to complete this, and no luck. Thanks in advance for help.

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  • DeveelDB

    - by csharp-source.net
    DeveelDB is a full embeddedable SQL database management system for .NET and Mono frameworks, managing small to large amount of data with a wide support for complex types. Some of the key features of this project are: - the strong transactional system for isolated operations an efficient memory management to reduce the impact on the runtime - its open architecture, to permit development of modules and features - a small footprint: the core library is ~1Mb

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  • Microsoft Certifications &ndash; how to prep? and why?

    - by Kelly Jones
    I often get asked by my colleagues, “how do you prepare for Microsoft exams?” Well, the answer for me is a little complicated, so I thought I’d write up here what I do. The first thing I do is go to Microsoft’s website to find the exam that I need to take.  If you’re looking to get a particular certification, then their site lists the exam or exams that you’ll need to pass.  If you’ve already taken an exam, you can log onto the MCP website and use their certification planner.  This little tool tells you what tests you need, based on the exams you’ve already passed.  It is very helpful with the certifications that are multiple tests and especially ones that have electives. Once you’ve identified the test, you can use Microsoft’s website to see the topics that it covers.  This is a good outline to follow when you study.  I’ll keep this handy to reference back throughout my studying to make sure that I’m covering all the topics I need to know. The next step is probably where I am a little different from others.  IF the exam outline covers material that I’ve already been working with, then I’ll skip a lot of the studying and go directly to the practice tests.  However, if I’m looking at the outline and wondering how in the world do you do that? – then it’s time to hit the books. So, where to find study materials?  Try typing in the exam number into any search engine.  You’ll typically find a ton of resources.  If you’re lucky, you’ll find books that others recommend based on their studying and exam experience.  As a Sogeti employee, I have access to three really good resources: an internal company list of all of the consultants who have passed particular tests (on our Connex website), Books 24x7, and Transcender practice exams. Once my studying is done (either through books or experience), I’ll go through the practice exams.  I find them really helpful in getting my knowledge lined up to the thinking process that the exam writers use.  If I’m relying on my experience, then this really helps me to identify gaps in my knowledge that I’ll need to fill. That’s about it.  If I’m doing ok on the practice exams, then I’ll take the real thing.  I’ve found that the practice exams are usually more difficult than then real thing. Oh – one other thing I do related to Microsoft exams – I try to take any beta exams that Microsoft makes available that fall into my skill set.  Microsoft has started a blog to announce these and the seats usually fill up really quick.  The blog is at http://blogs.technet.com/betaexams/ . You don’t get your results instantly, like a normal exam, instead you have to wait for everyone to finish taking the beta exams and for Microsoft to determine which questions they are using and which they are dropping.  So, be prepared to wait six to eight weeks for your results.

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  • Understanding When Social Interactions Should Be Resolved in Another Channel

    - by Christina McKeon
    Guest Blogger: Aphrodite Brinsmead, Senior Analyst at Ovum Agents need to respond to customers’ social comments and questions quickly and in the right tone. But more importantly, they need to offer resolutions. Customers care most about how long it takes to find information rather than which channel they are using. They choose to use social media because they are comfortable with the channel and it offers a convenient way to communicate. Ideally agents will resolve questions within social media, but they need guidance as to how and when to escalate interactions to a more private channel. First, businesses should assess the way in which customers are using social media to communicate with them and categorize posts into groups: complaints, feedback, technical queries or more general support questions. They should then consider the types of interactions that can easily be handled within social media and those that need to be followed up in another channel. This will be very dependent on the industry. Examples of queries that can be resolved in social media include Shipping pricing and timeframes Outage updates and resolution plans Flight status information Product stock check Technical support videos or forum posts Availability of facilities Both customers and agents need to be educated about the types of questions they can expect to resolve within social media. As the channel matures as a customer service tool, it needs to have value other than just as a forum for complaints. Social customer service agents need the power to start a web chat or phone call Any questions where customers need to divulge personal details in order to get a resolution will need to be addressed in a private channel: a private social message, web chat, email or phone call. Customers should never disclose their date of birth, social security, credit card number, or healthcare records in a public forum. Flight issues, changes to a booking, billing queries or account updates will all need to be completed via a private interaction. Agents responding to questions on social media need the ability to start a web chat or phone call with the customer. The customer doesn’t want to have to repeat their question and the agent should be empowered to connect customer records and access account or billing information. These agents will need to be trained across different channels and should be able to view all customer communications in one application. They also need to follow up questions that began on a public forum in the initial channel to make it clear that the issue was addressed. In order to make this possible, social media needs to be integrated as part of a broader customer service strategy. Irrespective of how many channels are used to complete an interaction, businesses should prioritize customer satisfaction and issue resolution. They need a clear strategy and trained agents that can handle and respond to social interactions. Follow me on Twitter @diteb. 

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  • What options are out there for an embeddable WYSIWIG text editor?

    - by Evan Plaice
    I'm thinking something along the lines of TinyMCE Please include a list of features. Examples include: supports text formatting supports links supports images syntax types (markdown/wiki/etc) licensing and/or pricing customizibility plugin support browser compatibility Note: Please limit the answers to one editor per answer to preserve cleanliness Update: Forgot to add browser compatibility to the list

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  • Black Techniques Of SEO

    Search Engine Optimization, or more popularity known as SEO, is one of the most popular types of Internet marketing techniques used by many webmasters today. It is used not only to market their brand... [Author: Margarette Mcbride - Web Design and Development - June 10, 2010]

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  • CommonFilter and CommonData solutions on CodePlex updated

    - by TATWORTH
    The CommonFilter and CommonData solutions on Codeplex have been updated post VS2010 SP1. The respective URLs are: http://commondata.codeplex.com/releases/view/62502 http://commonfilter.codeplex.com/releases/view/62499 CommonFilter is a cut-down version of CommonData containing just the filter functions. Common Data contains a vast number of useful functions for building ASP.NET web sites including: Lightweight reporting to a custome event log Filter functions for common types of data input

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  • Open Source Analysis

    - by BluFire
    There are a lot of code in open source projects, looking at all of the code is time consuming and can be confusing to a novice like me. Are there any sections of open-source projects that should be focused on? What should I focus on when I look at code? I'm asking this in general because if I ask this specifically, the question will only apply in one or two projects rather than an entire group of projects ranging in different types of games and difficulty.

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  • New Best-in-Class Solutions in Supply Chain Planning - Part 1

    Hear Nadeem Syed, Oracle Group Vice President, Advanced Planning Products discusst Oracle's recently announced best-in-class Supply Chain Planning solutions: Advanced Planning Command Center, Demand Signal Repository, Spare Parts Planning and Manufacturing Operations Center. Gain an understanding of the capabilities of these ground-breaking planning solutions and what types of enterprises can benefit from them.

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  • How to find out console equivalents of Ubuntu System Settings GUI?

    - by user4514
    How do I in general find out, what the very nice "System Settings GUI" in Ubuntu (say 12.04) does and how to replicate the changes in command line? Many people ask questions like "how to change the keyboard rate using command line", and often the answers do not help and are hard to find. What is the easiest way to find out, what the GUI is actually changing (for various types of settings. I.e. keyboard layout, rate, mouse, network, ...)

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  • Explore What';s Inside of a Fiber Optic Cable

    Fiber optic cable (or optical fiber) is unlike most types of cables; it draw on light instead of electricity to transmit signals. As you have already known, light is the fastest method of transmittin... [Author: Rahim Bidgoli - Computers and Internet - April 02, 2010]

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