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• Using ASP.NET session state with Silverlight (PRISM)

  - by Jon Andersen

  Hi, The scenario: I have a PRISM application developed in Silverlight (4), and I'm using a ASP.NET server side application to host several web-services (which, in turn, accesses WCF-services, but that's not really important here). The Silverlight application must be able to call the web services cross-domain (meaning that the web services isn't necessarily on the same server hosting the silverlight application). The Silverlight application consists of several modules, each accessing the ASP.NET web-services. I do not have much experience with Silverlight and PRISM, but as far as I can see, this is not a very unusual scenario... The problem: My challange is, that when 2 different modules access the web-services, I get 2 new sessions on the web-server. I would have thought that since both modules live on the same HTML-page (and then also in the same browser session), they would get the same session on the web-server...? I have tried to make the web-service Proxy-client globally available in the container (using Unity), by registering an instance (using Container.RegisterInstance), and then getting this instance whenever a module needs to make a web-service call (using Container.Resolve), but this doesn't seem to help. However, any calls made within the same module always gets the same session on the server. Can anyone see what I'm missing here...? Thanks! Jon

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• Linking Mapkit with Core Data, Search and user location. Converting annotations from a database in a tableview with search to display in a mapview?

  - by Jon

  Xcode is quite new to me so explanations are appreciated. I am looking to build an application that displays annotations in a mapview (zoomed in on current user location). I want the applications to come from some sort of database rather than manually inputting all the annotations (which is what I'm currently doing) What would be my application type? tab based? window based? i want a tab for a tableview with a list of my annotations and a mapview tab that will show my database of annotations but with the map zoomed in on current location. In a perfect world, it would be great if the user could add favourites from these annotations and keep them in a favourites tableview tab. I'm desperate to work this out and create a fully functional app for a final uni project. i have a working application already but it's nothing like what i am trying to achieve, any help would be much appreciated!!!! Jon (if looked through countless tutorials and as of yet found nothing i can understand to achieve a project like this. Some would call me too ambitious, I just want to make a decent app)

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• When returning from a period of not programming, do you find you've improved?

  - by Jon Purdy

  It seems as though whenever I take an extended break from programming—whether to pursue other interests or simply because I fall out of the habit for a while—I invariably find that when I return to a project and set to coding, I come with an abundance of new ideas, novel approaches, and just plain better code. It may be because I have a lot of other creative interests besides programming, and my mind likes to find correlation and crossover between them, so while I'm doing one thing, in the back of my mind I'm usually also applying it to another. So what's your experience? Do you ever return from a break (whether intentional or not) feeling not only refreshed, but also somehow noticeably improved? Is it actually the norm?

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• How do Programmers in the east see programmers in the west?

  - by Jon Hopkins

  The other half of this question: How do programmers in the west see the programmers in the east? I think it's just as interesting and important to see how programmers in the east view programmers in the west. The eastern part of the world (India/China/Philippines ) is often seen as mainly providing outsourcing services to the western world (USA and Europe). Do you have the experience of working as part of an offshore team? If yes, how was it? Do you hold any generalized ideas or opinions about the programmers from the West (e.g. Are they cooperative, do they deliver on time or do they do quality work?)

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• Bridged network between Ubuntu Desktop 10.10 host and Ubuntu Server 10.10 Guest

  - by Jon Cram

  I run Ubuntu 10.10 Desktop on my machine and have installed Ubuntu Server 10.10 in a Virtualbox VM. I'm running Virtualbox 4.0.2. It is not virtualbox-ose. I'd like the guest OS to have an IP address on my local network so that I can run server software and access this from the host OS. My intention is to run a Hudson CI server in the guest OS. I understand I need to set up a network bridge for this to work, however I don't understand what I need to do for this to happen. I have tried following the instructions at https://help.ubuntu.com/community/VirtualBox/Networking, however I run into two issues towards the end: "To take the modifications into account, restart the VirtualBox host networking script". I don't have Virtualbox-ose installed and guide suggests sudo /etc/init.d/vboxnet restart, however /etc/init.d/vboxnet does not exist for me. The end of the guide refers to the vboxusers group. I don't have such a group and am not sure why I need this or how it should be created. I'm simply looking to allow the guest OS to have an IP on my local network so that I can access servers on the guest OS from the host OS. What changes do I need to make to both the host and guest OSs for this to work?

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• How do Programmers in the East see programmers in the West?

  - by Jon Hopkins

  The other half of this question: How do programmers in the west see the programmers in the east? I think it's just as interesting and important to see how programmers in the east view programmers in the west. The eastern part of the world (India/China/Philippines ) is often seen as mainly providing outsourcing services to the western world (USA and Europe). Do you have the experience of working as part of an offshore team? If yes, how was it? Do you hold any generalized ideas or opinions about the programmers from the West (e.g. Are they cooperative, do they deliver on time or do they do quality work?)

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• SEO: Nested List vs List, Split Over Divs vs Definition List

  - by Jon P

  From an SEO perspective which, if any, is better: Option 1: Nested lists with h2 tags <ul id="mainpoints"> <li><h2>Powerful Analysis</h2> <ul> <li>Charting and indicators</li> <li>Daily trading signals</li> <li>Company health checks</li> </ul> </li> <li><h2>World Market Data</h2> <ul> [List Items removed for brevity] </ul> </li> <li><h2>Daily Market Data</h2> <ul> [List Items removed for brevity] </ul> </li> </ul> Option 2: Divs with h2 and lists <div id="mainpoints"> <div> <h2>Powerful Analysis</h2> <ul> <li>Charting and indicators</li> <li>Daily trading signals</li> <li>Company health checks</li> </ul> </div> <div> <h2>World Market Data</h2> <ul> [List Items removed for brevity] </ul> </div> <div> <h2>Daily Market Data</h2> <ul> [List Items removed for brevity] </ul> </div> </div> Option 3: Definition List <dl id="mainpoints"> <dt>Powerful Analysis</dt> <dd>- Charting and indicators</dd> <dd>- Daily trading signals</dd> <dd>- Company health checks</dd> <dt>World Market Data</dt> [List Items removed for brevity] <dt>Daily Market Data</dt> [List Items removed for brevity] </dl> My instincts tell me that semanticaly the pure list options (1 & 3) are the best and that h2 may be more SEO friendly (1 & 2) which would point to option 1 as being the best option. I do love the lean makeup of the definition list but will I take an SEO hit by losing the h2 tags? Before anyone asks, h2 is not valid markup in a dt tag. Are my instincts right with a nested list being the way to go?

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• how to access inaccessible mac os x hard drive via ubuntu

  - by jon

  Background: My intention was to load a Virtual Machine (VM) on my Mac OS X Snow Leopard. My Mac had just enough room for a VM (my thought process was that VM was the same as partition) However, I burned the newest version of Ubuntu onto a CD, thinking that partitioning and running a virtual machine would be the same. I would restart my computer, booting up Ubuntu installer. The installation would not allow me to partition, forcing me to force shutdown my laptop. when I turn on my laptop, I see that my computer is "missing operating system". So, can someone help me fix my a) bootcamp, b) getting files and if a and b are fixed c) to install ubuntu as a VM?

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• Salt and hash a password in .NET

  - by Jon Canning

  I endeavoured to follow the CrackStation rules: Salted Password Hashing - Doing it Right    public class SaltedHash     {         public string Hash { get; private set; }         public string Salt { get; private set; }         public SaltedHash(string password)         {             var saltBytes = new byte[32];             new RNGCryptoServiceProvider().GetNonZeroBytes(saltBytes);             Salt = ConvertToBase64String(saltBytes);             var passwordAndSaltBytes = Concat(password, saltBytes);             Hash = ComputeHash(passwordAndSaltBytes);         }         static string ConvertToBase64String(byte[] bytes)         {             return Convert.ToBase64String(bytes);         }         static string ComputeHash(byte[] bytes)         {             return ConvertToBase64String(SHA256.Create().ComputeHash(bytes));         }         static byte[] Concat(string password, byte[] saltBytes)         {             var passwordBytes = Encoding.UTF8.GetBytes(password);             return passwordBytes.Concat(saltBytes).ToArray();         }         public static bool Verify(string salt, string hash, string password)         {             var saltBytes = Convert.FromBase64String(salt);             var passwordAndSaltBytes = Concat(password, saltBytes);             var hashAttempt = ComputeHash(passwordAndSaltBytes);             return hash == hashAttempt;         }     }

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• Best in-memory cache of DB objects for Silverlight [closed]

  - by Jon

  Hi, I'd like to set up a cache of database objects (i.e. rows in a table) in memory in silverlight, which I'll do using WCF and linq-to-sql. Once I have the objects in memory, I'm planning on using MSMQ to receive new objects whenever they have been modified. It's a somewhat complex approach but the goal is to reduce trips to the database and allow instant data communication between Silverlight applications that are connected to the MSMQ. My Silverlight applications are meant to be long-running and the amount of data to be cached will not be large. I'm planning on saving the in-memory cache using local storage. Anyway, in order to process the updated objects that come in, I'd like to know if the user has changed the existing object. Could I use some event relating to data-binding to set a flag indicating that the object has changes? Maybe there's a better way to do the cache entirely? Thanks!

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• Convert Dynamic to Type and convert Type to Dynamic

  - by Jon Canning

  public static class DynamicExtensions     {         public static T FromDynamic<T>(this IDictionary<string, object> dictionary)         {             var bindings = new List<MemberBinding>();             foreach (var sourceProperty in typeof(T).GetProperties().Where(x => x.CanWrite))             {                 var key = dictionary.Keys.SingleOrDefault(x => x.Equals(sourceProperty.Name, StringComparison.OrdinalIgnoreCase));                 if (string.IsNullOrEmpty(key)) continue;                 var propertyValue = dictionary[key];                 bindings.Add(Expression.Bind(sourceProperty, Expression.Constant(propertyValue)));             }             Expression memberInit = Expression.MemberInit(Expression.New(typeof(T)), bindings);             return Expression.Lambda<Func<T>>(memberInit).Compile().Invoke();         }         public static dynamic ToDynamic<T>(this T obj)         {             IDictionary<string, object> expando = new ExpandoObject();             foreach (var propertyInfo in typeof(T).GetProperties())             {                 var propertyExpression = Expression.Property(Expression.Constant(obj), propertyInfo);                 var currentValue = Expression.Lambda<Func<string>>(propertyExpression).Compile().Invoke();                 expando.Add(propertyInfo.Name.ToLower(), currentValue);             }             return expando as ExpandoObject;         }     }

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• Universal navigation menu across domains

  - by Jon Harley

  I'd like to start by saying that I've searched for hours and could not find a definitive answer to my question. Across different sites on different second-level domains exists a universal navigation bar with a collection of roughly 30 links. This universal bar is exactly the same for every page on each domain. The bar's HTML, CSS and JavaScript are all stored in a subfolder for each domain and the HTML is embedded upon serving the page and is not being injected on the client side. None of the links use any rel directives and are as vanilla as can be. My question is about Google's duplicate content rule. Would something like this be considered duplicate content? Matt Cutt's blog post about duplicate content mentions boilerplate repetition, but then he mentions lengthy legalese. Since the text in this universal bar is brief and uses common terms, I wonder if this same rule applies. If this is considered duplicate content, what would be a good way to correct the problem? Thank you for your help.

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• Broadcom BCM4331 not working on new Mac Mini 5,1

  - by Jon

  I can't seem to get my wireless card working on my Mac Mini 5,1. Lspci returns: 03:00.0 Network controller: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02) But running "additional drivers" doesn't detect anything. The nm-applet menu reads "device not ready--firmware missing." What can I do to get this to work? Note, this is with 12.04.1, so many of the previous discussions (for 11.10, etc) probably don't apply here.

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• Emphasize Some Comments - but not Dirty the Code

  - by Jon Sandness

  I'm having trouble structuring my comments at the moment. I have major sections of the code that, when scrolling through the document, I want to be able to see those stand out. Examples: This is a normal comment: int money = 100; //start out with 100 money - This is a comment to emphasize a certain part of the code: /****** Set up all the money ******/ But I don't like that this isn't very clean. Is there a standard way of setting up this type of a comment?

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• Universal navigation menu across domains - would it be considered duplicate content?

  - by Jon Harley

  Across different sites on different second-level domains exists a universal navigation bar with a collection of roughly 30 links. This universal bar is exactly the same for every page on each domain. The bar's HTML, CSS and JavaScript are all stored in a subfolder for each domain and the HTML is embedded upon serving the page and is not being injected on the client side. None of the links use any rel directives and are as vanilla as can be. My question is about Google's duplicate content rule. Would something like this be considered duplicate content? Matt Cutt's blog post about duplicate content mentions boilerplate repetition, but then he mentions lengthy legalese. Since the text in this universal bar is brief and uses common terms, I wonder if this same rule applies. If this is considered duplicate content, what would be a good way to correct the problem?

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• What are the advantages and disadvantages to using your real name online?

  - by Jon Purdy

  As a programmer, do you see any professional or other advantage in using your real name in online discourse, versus an invented handle? I've always gone by a single username and had my real name displayed whenever possible, for a few reasons: My interests online are almost exclusively professional and aboveboard. It constructs a search-friendly public log of all of my work, everywhere. If someone wants to contact me, there are many ways to do it. My portfolio of work is all tied to me personally. Possible cons to full disclosure include: If you feel like becoming involved in something untoward, it could be harder. The psychopath who inherits your project can more easily find out where you live. You might be spammed by people who are not worth the precious time that could be better spent writing more of the brilliant software you're famous for. Your portfolio of work is all tied to you personally. It seems, anyway, that a vast majority of StackOverflow users go by invented handles rather than real names. Notable exceptions include the best-known users, who are typically well established in the industry. But how could we ever become legendary rockstar programmers if we didn't get our names out there? Discuss.

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• Recommendations for books and training resources covering for Design for Programmers

  - by Jon Hopkins

  Off the back of one of the answers to this question (currently the second highest scoring), it made me think, what's the best way to get developers up to speed on good basic design principals. I'm not talking about making them into graphic designers but some developers almost take pride in ugly UIs, seeing them as unimportant next to the functionality. What primarily interested in are the graphic design elements rather than the usability aspects which is pretty well covered by books such as Don't Make Me Think. Use of white space, emphasis, font selection and a million other things I'm probably not even aware of. I know people are often seen as artistic or not artistic but surely the basics can be taught and someone has written a book covering this?

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• Are there any non-self-taught famous programmers? [closed]

  - by Jon Purdy

  It seems to me that being a self-taught programmer has significant advantages over picking it up only in higher education. Not only does a self-taught developer have a headstart on their 10 000-odd hours of mastery, but their hobby demonstrates genuine interest. This will likely lead to a process of continuous self-improvement over their career, not to mention increased likelihood of producing personal projects that are worthy of fame. A programmer who spends four years in study (not nearly all of which is going to be directly concerned with programming) has far less leisure to explore and learn independently than does a developer who starts college with even a few years of dedicated hobbyist study. I wonder whether there are any famed developers who had no exposure to programming before deciding to study it in university. I simply doubt that an 18-year-old has the capacity to become a brilliant programmer with no prior experience, but that seems like an awfully elitist and unpleasant view, so I'd like to be proven wrong.

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• Recover files in Ubuntu from USB stick

  - by Jon

  I have Ubuntu 11.04 running from a USB stick. I think I ran some updates in terminal and now it has a kernel panic during boot up. Is there a way I can get hold of files I saved when Ubuntu was working? I just managed to watch the booot screen and it looks as if there are some errors saying there is no room to write to disk however my USB stick has 5GB free UPDATE: Here is what I see when I plug the USB stick into Windows

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• OData Mix10 &ndash; Part Dos

  - by Jon Dalberg

  The other day I had a snazzy post on fetching all the video (WMV) files from Mix ‘10. A simple, console application that grabbed the urls from the OData feed and downloaded the videos. I wanted to change that app to fire the OData query asynchronously so here’s what resulted: 1: static void Main(string[] args) 2: { 3: var mix = new Mix.EventEntities(new Uri("http://api.visitmix.com/OData.svc")); 4:   5: var temp = mix.Files.Where(f => f.TypeName == "WMV"); 6: var query = temp as DataServiceQuery<Mix.File>; 7:   8: query.BeginExecute(OnFileQueryComplete, query); 9:   10: // waiting... 11: Console.ReadLine(); 12: } 13:   14: static void OnFileQueryComplete(IAsyncResult result) 15: { 16: var query = result.AsyncState as DataServiceQuery<Mix.File>; 17: var response = query.EndExecute(result); 18:   19: var web = new WebClient(); 20:   21: var myVideos = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyVideos), "Mix10"); 22:   23: Directory.CreateDirectory(myVideos); 24:   25: foreach (Mix.File f in response) 26: { 27: var fileName = new Uri(f.Url).Segments.Last(); 28: Console.WriteLine(f.Url); 29: web.DownloadFile(f.Url, Path.Combine(myVideos, fileName)); 30: } 31: } There are two important things here that are not explained well in the MSDN docs: See lines 5 and 6? That’s where I query for the WMV files and it returns an IQueryable<T>. You *have* to cast that to a DataServiceQuery<T> and then call BeginExecute. The documented example does not filter so it didn’t show that step. Line 16 shows the correct way to get the previously executed DataServiceQuery<T> from the async result. If you looked at the MSDN example docs it shows (incorrectly) just casting the result, like this: // wrong var query = result as DataServiceQuery<Mix.File>; Other than those items it is relatively straight forward and we’re all async-ified. Enjoy!

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• What to look for in a free hosting plan? [duplicate]

  - by Jon

  This question already has an answer here: How to find web hosting that meets my requirements? 5 answers I have a test website that's hosted on a free plan by Zymic. At the moment I'm typing, it and my site is down. I don't want to let my clients down in the future. It's been down for over 2 days. I thought it was a coding problem at first, and then found out I couldn't connect to my server. Zymic had very good reviews, and its downtime was OK (not high or low), but now I want to change my web host. What should I look for (besides downtime guarantee)? Also, do you have any suggestions that with all the benefits? Any feedback will be greatly appreciated.

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• XNA Sprite Rotation Matrix - Moving Origin

  - by Jon

  I am currently grouping sprites together, then applying a rotation transformation on draw: private void UpdateMatrix(ref Vector2 origin, float radians) { Vector3 matrixorigin = new Vector3(origin, 0); _rotationMatrix = Matrix.CreateTranslation(-matrixorigin) * Matrix.CreateRotationZ(radians) * Matrix.CreateTranslation(matrixorigin); } Where the origin is the Centermost point of my group of sprites. I apply this transformation to each sprite in the group. My problem is that when I adjust the point of origin, my entire sprite group will re-position itself on screen. How could I differentiate the point of rotation used in the transformation, from the position of the sprite group? Is there a better way of creating this transformation matrix?

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• The Written Roles of Chief Technology Officer

  - by Jon Hopkins

  A follow up to this question: The Written Roles of Software Development Manager What is the role and what are the responsibilities of a CTO when it's done well, with particular reference to how it might pertain to a programmer with aspirations towards this sort of position? (Reason for asking - it's one potential career destination for programmers looking to move away from a purely hands-on role and for those with this sort of ambition it's worth knowing what it actually entails).

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• How can I get multitouch enabled on my Sentelic touchpad (msi x350 notebook)?

  - by Jon

  I understand my MSI x350 notebook comes with a Sentelic trackpad, which supports multi-touch (according to the MSI website). Is there a way to enable multitouch on Ubuntu? I've been having difficulty finding info about this on google, and since it's not a synaptics touchpad I haven't been able to find much info in ubuntu docs. My mouse preferences doesn't have a trackpad tab like it does on, say, a Macbook. Running "xinput list" returns: FSPPS/2 Sentelic FingerSensingPad id=11 And in my Xorg.0.log: [ 17.481] (II) config/udev: Adding input device FSPPS/2 Sentelic FingerSensingPad (/dev/input/event6) [ 17.481] () FSPPS/2 Sentelic FingerSensingPad: Applying InputClass "evdev pointer catchall" [ 17.481] () FSPPS/2 Sentelic FingerSensingPad: always reports core events [ 17.481] () FSPPS/2 Sentelic FingerSensingPad: Device: "/dev/input/event6" [ 17.500] (II) FSPPS/2 Sentelic FingerSensingPad: Found 11 mouse buttons [ 17.500] (II) FSPPS/2 Sentelic FingerSensingPad: Found scroll wheel(s) [ 17.500] (II) FSPPS/2 Sentelic FingerSensingPad: Found relative axes [ 17.500] (II) FSPPS/2 Sentelic FingerSensingPad: Found x and y relative axes [ 17.500] (II) FSPPS/2 Sentelic FingerSensingPad: Configuring as mouse [ 17.500] () FSPPS/2 Sentelic FingerSensingPad: YAxisMapping: buttons 4 and 5 [ 17.500] (**) FSPPS/2 Sentelic FingerSensingPad: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200 [ 17.500] (II) XINPUT: Adding extended input device "FSPPS/2 Sentelic FingerSensingPad" (type: MOUSE) [ 17.500] (II) FSPPS/2 Sentelic FingerSensingPad: initialized for relative axes. [ 17.500] (II) config/udev: Adding input device FSPPS/2 Sentelic FingerSensingPad (/dev/input/mouse0)

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• eBook editions of programming books

  - by Jon Hopkins

  (I'll get my justification for why this is on topic in early: programming books tend to have fairly specific formatting needs - code samples, tables, images and graphs - which are not common to all book types and are not necessarily well handled by eBook readers. Similarly they're used in different ways - you often dip in and out rather than read cover to cover.) I've just noticed that Don't Make Me Think by Steve Krug is available as an eBook edition for the Kindle (and presumably also for other readers) which set me thinking. There are certain advantages to eBook readers for tech books - primarily that you can carry a massive library of what would be heavy physical books around very easily. The downside is that certain eBook readers allegedly aren't particularly well equipped to cope with tables, code samples and so on and a book like Don't Make Me Think presumably makes extensive use of these sorts of things. So, the question, what are your experiences of reading and using programming books on an eBook reader and would you recommend it? I'm specifically interested in the latest generation Kindle but happy to hear about all devices - might be useful to state which one you use in the answer.

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