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• Which .NET REST approach/technology/tool should I use?

  - by SonOfPirate

  I am implementing a RESTful web service and several client applications that are mostly in Silverlight. I am finding a litany of options for developing both the server-side and client-side of the API but am not sure which is the best approach. I'm concerned about stability as well as a platform that will continue to exist a few months from now. We started using the REST Starter Kit with .NET 3.5 but moved to the new WCF Web API when updating to .NET 4.0. All of their documentation indicates that WCF Web API is the replacement for the RSK. However, Web API is only in Preview 4 and does not include support for Silverlight or Windows Phone 7 clients (yet). WCF Web API looks like a wrapper on top of the WCF WebHttp Services stuff provided in the System.ServiceModel.Web library which makes me think that maybe it would be simpler to just go with the built-in stuff but Web API does offer some nice features. I am specifically tied-up trying to determine the best course for the client-side. My main requirement is that I need to support deserializing into my client-side objects quickly and easily. The Web API offers a nice client library but doesn't have a Silverlight version. I'd like to use the latest approach and the toolset that is being actively developed and supported. Is the REST Starter Kit really obsolete? Has anyone had any success implementing the WCF Web API toolkit? Is there merit to using either of these over the built-in WCF WebHttp Services features found in System.ServiceModel.Web? Is there a single solution that works for any client (web, Silverlight, etc.)? What suggestions do you have?

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• OLL Live webcast - Using SQL for Pattern Matching in Oracle Database

  - by KLaker

  If you are interested in learning about our exciting new 12c SQL pattern matching feature then mark your diaries. On Wednesday, October 30th at 8:00 am (US/Pacific time zone) Supriya Ananth, who is one of our top curriculum developers at Oracle, will be hosting an OLL webcast on our new SQL pattern matching feature. The ability to recognize patterns in a sequence of rows has been a capability that was widely desired, but not possible with SQL until now. Row pattern matching in native SQL improves application and development productivity and query efficiency for row-sequence analysis. With Oracle Database 12c you can use the new MATCH_RECOGNIZE clause to perform pattern matching in SQL to do the following: Logically partition and order the data using the PARTITION BY and ORDER BY clauses Use regular expressions syntax to define patterns of rows to seek using the PATTERN clause. These patterns a powerful and expressive feature, applied to the pattern variables you define. Specify the logical conditions required to map a row to a row pattern variable in the DEFINE clause. Define measures, which are expressions usable in the MEASURES clause of the SQL query. For more information and to register for this exciting webcast please visit the OLL Live website, see here: https://apex.oracle.com/pls/apex/f?p=44785:145:116820049307135::::P145_EVENT_ID,P145_PREV_PAGE:461,143.  Please note - if the above link does not work then go to OLL (https://apex.oracle.com/pls/apex/f?p=44785:1:) and click the OLL Live icon (upper right, beneath the Login link or logout link if you are already logged in). The pattern matching webcast is listed on the calendar of events on 30 October.

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• How to achieve a loosely coupled REST API but with a defined and well understood contract?

  - by BestPractices

  I am new to REST and am struggling to understand how one would properly design a REST system to both allow for loose coupling but at the same time allow a consumer of a REST API to understand the API. If, in my client code, I issue a GET request for a resource and get back XML, how do I know what to do with that xml? e.g. if it contains <fname>John</fname><lname>Smith</lname> how do I know that these refer to the concept of "first name", "last name"? Is it up to the person writing the REST API to define in documentation some place what each of the XML fields mean? What if producer of the API wants to change the implementation to be <firstname> instead of <fname>? How do they do this and notify their consumers that this change occurred? Or do the consumers just encounter the error and then look at the payload and figure out on their own that it changed? I've read in REST in Practice that using a WADL tool to create a client implementation based on the WADL (and hide the fact that you're doing a distributed call) is an "anti-pattern". But I was planning to do this-- at least then I would have a statically typed API call that, if it changed, I would know at compile time and not at run time. Why is this a bad thing to generate client code based on a WADL? And how do I know what to do with the links that returned in the response of a POST to a REST API? What defines this contract and gives true meaning to what each link will do? Please help! I dont understand how to go from statically-typed or even SOAP/RPC to REST!

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• Comparing Dates in Oracle Business Rule Decision Tables

  - by James Taylor

  I have been working with decision tables for some time but have never had a scenario where I need to compare dates. The use case was to check if a persons membership had expired. I didn't think much of it till I started to develop it. The first trap I feel into was trying to create ranges and bucket sets. The other trap I fell into was not converting the date field to a complete date. This may seem obvious to most people but my Google searches came up with nothing so I thought I would create a quick post. I assume everyone knows how to create a decision table so I'm not going to go through those steps. The prerequisite for this post is to have a decision table with a payload that has a date field. This filed must have the date in the following format YYYY-MM-DDThh:mm:ss. Create a new condition in your decision table Right-click on the condition to edit it and select the expression builder In the expression builder, select the Functions tab. Expand the CurrentDate file and select date, and click Insert Into Expression button. In the Expression Builder you need to create an expression that will return true or false, add the operation <= after the CurrentDate.date In my scenario my date field is memberExpire, Navigate to your date field and expand, select toGregorianCalendar(). Your expression will look something like this, click OK to get back to the decision table Now its just a matter of checking if the value is true or false. Simple when you know how :-)

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• FULL LIST Difference Edubuntu over Ubuntu

  - by Richard Kemp

  I have always used Edubuntu rather than Ubuntu because I have many children including home educated ones who casually use the education offerings. I appreciate many but not all of the extra offerings. I never got beyond 8.04.4 LTS, so am considering updating. I note now with Edubuntu 12.04 it is 2GB i.e.4 times bigger, even apparently using squashfs. I do now have to consider whether the extra resources are worth it in each computer in my household. I am sick of reading over and over again 'Edubuntu is Unbuntu with extras such as blah blah', and in a different place the same thing but with a different blah blah. I downloaded Edubuntu 12.04 and ran it 'live'. Can't say I got on at all with the Unity Interface (this can be changed when installed), but the apparent education stuff seemed quite small and pathetic, I am obviously not finding it. Is there anywhere a FULL LIST of what Edubuntu has pre-installed has over Ubuntu, so a sensible decision can be made whether to go for it, or just add packages that look relevant to me to Ubuntu. Is there truly no other difference between Unbuntu/Edubuntu but the extra educational packages? (I for example have no school server, but if I understood exactly what is involved, with the number of computers in the house, it may be worth creating one!) Please advise. Thank You.

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• What tools should every programmer know?

  - by acidzombie24

  What are some tools every programmer know about? Some examples i thought were Source control. (No explanation needed) Profiler. Many could go without but its good to know how to use one when the occasion arise What else? I was thinking a bug report software but i havent used one so i wasnt sure. Should programmers know how to use TRAC? I remember in the past a person telling me if i was making a shared library i should know (Some Name) which generates docs from the source (in that case C++). What was that called and what else should i know about? -edit- what about team management software? any software you could not live without in a specific project would be a good mention. I'll also mention i use VMs frequently during the prototype or end phase to see if there are any issues on a clean XP or linux distro and if i forgot anything in my redistribution. I cant imagine the end/release and testing phase of a project without a VM.

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• Desktop switcher appears to be broken for quick double-switches

  - by Jon Blackburn

  I'm wondering if anyone else has seen this. I have three virtual desktops aligned in a horizontal row. In the middle desktop I have only a single application window. I have keyboard shortcuts mapping to navigate between the desktops. Obviously, I never use the up/down arrows because I only have one row of workspaces. Here's the problem, which only started to happen after I installed 12.04.1: When I rapidly hit to go from workspace 1 to workspace 3, the window on workspace 2 gets moved to workspace 1. I have checked using both Unity and Gnome3, and the behavior is the same under both. If I change back to the default workspace setup (a 2x2 grid of desktops) things seem to settle down (i.e., no wandering windows). Not every type of application window behaves the same way. I couldn't get a Chrome browser to jump from 2 to 1, but both Terminal and Terminator exhibit the behavior. Any thoughts? Better workarounds? Thanks in advance.

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• Problems installing Ubuntu on a vaio with SSD, GRUB installation failure

  - by Alberto

  I have installed and used Ubuntu in several computers. But now I have a problem that I don't know how to solve. I have a Vaio (Product name: vpcz13c5e), it has a SSD 128gb. I decided to install Ubuntu (12.04, but I have tried older versions as well). Firstly, I tested with live USB, and everything was fine, so I decided go for the complete installation. Then everything went as follows: I chose to use the whole disk (first option, formatting everything). I got a message Executing 'grub-install' /deb/sdb failed. This is a fatal error After clicking ok I got another window with 3 options: the first offers different devices to install the bootloader on (I tried all of them and none works). Second option: Continue without a bootloader. In that case I got You will need to manually install a bootloader in order to start Ubuntu The third option is Cancel the installation. So, I chose Continue without a bootloader. Then I restart the computer (with the Live cd) and in a terminal type sudo fdisk -l but I obtain fdisk: unable to seek on /dev/sda: Invalid argument What can I do? any help will be appreciated.

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• Configuring WS-Security with PeopleSoft Web Services

  - by Dave Bain

  I was speaking with a customer a few days ago about PeopleSoft Web Services.  The customer created a web service but when they went to deploy it, they had so many problems configuring ws-security, they pulled the service.  They spent several days trying to get it working but never got it working so they've put it on hold until they have time to work through the issues. Having gone through the process of configuring ws-security myself, I understand the complexity.  There is no magic 'easy' button to push.  If you are not familiar with all the moving parts like policies, certificates, public and private keys, credential stores, and so on, it can be a daunting task.  PeopleBooks documentation is good but does not offer a step-by-step example to follow.  Fear not, for those that want more help, there is a place to go. PeopleSoft released a Mobile Inventory Management application over a year ago.  It is a mobile app built with Oracle Fusion Application Development Framework (ADF) that accesses PeopleSoft content through standard web services.  Part of the installation of this app is configuring ws-security for the web services used in the application.  Appendix A of the PeopleSoft FSCM91 Mobile Inventory Management Installation Guide is called Configuring WS-Security for Mobile Inventory Management.  It is a step-by-step guide to configure ws-security between a server running Oracle Web Server Management (OWSM) and PeopleSoft Integration Broker.  Your environment might be different, but the steps will be similar, and on the PeopleSoft side, Integration Broker will remain a constant. You can find the installation guide on Oracle Suport.  Sign in to https://support.us.oracle.com and search for document 1290972.1.  Read through Appendix A for more details about how to set up ws-security with PeopleSoft web services.

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• Getting xsession-errors after Unity Lens install

  - by David

  I apologize in advance if I am leaving something out here. Please let me know what additional info is required, and i will be happy to post it. Can you tell me what these error messages are, and how I can go about resolving them? WARN 2012-02-02 14:02:56 unity.glib.dbusproxy GLibDBusProxy.cpp:255 Cannot call method InfoRequest proxy /net/launchpad/lens/utilities does not exist WARN 2012-02-02 14:02:56 unity.glib.dbusproxy GLibDBusProxy.cpp:255 Cannot call method SetActive proxy /net/launchpad/lens/utilities does not exist WARN 2012-02-02 14:02:56 unity.iconloader IconLoader.cpp:509 Unable to load contents of file:///usr/share/icons/unity-icon-theme/places/svg/category-installed.svg: Error opening file: No such file or directory WARN 2012-02-02 14:02:56 unity.iconloader IconLoader.cpp:509 Unable to load contents of file:///usr/share/icons/unity-icon-theme/places/svg/category-available.svg: Error opening file: No such file or directory WARN 2012-02-02 14:02:56 unity.glib.dbusproxy GLibDBusProxy.cpp:255 Cannot call method InfoRequest proxy /net/launchpad/lens/askubuntu does not exist WARN 2012-02-02 14:02:56 unity.glib.dbusproxy GLibDBusProxy.cpp:255 Cannot call method SetActive proxy /net/launchpad/lens/askubuntu does not exist I am also getting Nautilus errors logged here. I do not remember what lenses I installed, or from where (Software Center, manual install, etc).

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• Inconsistent booting problem 12.04LTS on Asus U46E RAL7

  - by G. He

  The laptop is dual booting with windows 7 and ubuntu 11.10. For 11.10 to boot, I had to add 'nolapic' in GRUB boot options. I downloaded 12.04LTS LiveCD yesterday and made a CD and a bootable USB stick. With both USB and LiveCD, occasionally I can boot into 12.04. But many times, the boot process stuck at some point. For USB boot, sometime it works. But other times, it seems to stuck right after seeing the message: NMI watchdog enabled. takes one hw-pmu counted [0.408590] #2 The number in [] changes. Some times it stuck at #2, and sometimes at #3. For LiveCD boot, sometime it works. But when it stuck, it stuck at different places. At times, the boot process go directly to a blank screen with a blink '_' at up left corner. Sometime it went a bit further, after showing options to try/install ubuntu then stuck with a blank screen with blink '_'. Anything I can do to get around of this?

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• What is Mark Shuttleworth's "Easter eggs" blog a reference to? [closed]

  - by fluteflute

  I saw this blog post today, and I was wondering if there's some meaning within the Ubuntu community that I've missed? (I know what an easter egg is in a computer context.) One of our ducks has started dropping eggs in random locations in the garden. I don’t know which duck, but I assume it’s one of the new females we took in from the SPCA, who hasn’t figured out “nesting” yet. I do love ‘em but they’re not African Grey’s in the IQ department. Anyhow, I think I finally understand why people hide eggs in the garden at Easter. Because ducks used to do it for them! I suppose, for millennia, this has been the season to go hunting for eggs. Now we just substitute chocolate ones instead. For the moment, I’ve kept them in a cool shady spot while I keep an eye out for an actual nest. If a polecat doesn’t find them first, I may be able to slip them onto the nest in time for them to get hatched along with some cousins.

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• What data to send when tracking clicks with Google Analytics events (and how)?

  - by user359650

  When tracking clicks on links, there are 3 items I'm interested in: link location in the page by grabbing the id of the closest parent: to see influence of location on click-through link text: to see influence of text on click-through link href attribute value: to see where people go when leaving my website The problem when using Google Analytics to track those clicks is that events only have 3 available text fields, one of which being the category, which if you use to store one of the above items will create a mess in your Event reporting because you will have as many categories as item values. Therefore if you assign a predefined value to the category (e.g. clicks), then you're left with only 2 event fields (action, label) to store 3 items (location, text, href). That in itself isn't the end of the world because you can concatenate 2 items into 1 event field, then use the reporting or the API to filter things out. Accordingly what I plan on doing is this: category: clicks action: {location_on_page} ¦ {text} label: {href} where {__} are variable values related to the clicked links With this I can easily create some reports directly via the GUI: downloads: include only events where label ends with .pdf click outs to particular domains: include only events where label contains domain And for more complex tasks I need to export the data (or use the API): influence of location on clicks: for each location in the design, count number of events that have that location in the action, then corroborate with pageviews of the corresponding pages. Whilst this looks good I'm wondering if there is a better approach, hence the following questions: Q1: Can you foresee any particular issues with this particular setup (e.g. things I won't be able to report on)? Q2: Can you think of other data that would be interesting to include in the event?

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• How to recover from terminal custom setup

  - by linq

  I installed ubuntu 12.04 and I added "Terminal" to the launcher bar, the default size of the terminal is a bit small, after some googling here is how I made the disaster change: At HUD menu, type "preference" and I see the option of Edit > preference, this is as I expected After I clicked the option, I forget the exact steps, but somehow I came to some configuration panel and there is a checkbox for terminal "custom" and I checked it now an input box is enabled and I type gnome-terminal --geometry 160x50 Now the problem comes, whenever I click the terminal button at the launcher bar, new terminal windows pops up endlessly from everywhere, I cannot do anything any more except logout or shutdown. The weird thing is, after I come back, I cannot get that Edit > preference any more when I type "preference" in HUD, I tried "Edit", "preference". To be clear, I still can use the computer as long as I do not click that terminal button, but I really want to use terminal to run commands. Help is appreciated greatly! Update - OK, figured out. Go to /home/jibin/.gconf/apps/gnome-terminal/profiles/Default and open that xml file, I can see the options I changed at the GUI, remove them and terminal runs good. The preference HUD is back also, it is actually Profile Preference and it is only available when terminal is open. Continue my ubuntu-ing...

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• 50% off ASP.NET hosting

  - by Fabrice Marguerie

  I haven't blogged for a long time because I'm busy working on an exciting new project. It's too early to tell you more. I'll provide details in a few months. Meanwhile, I wanted to write a quick post to share an excellent offer with you. It's that time of the year when you can get deals on many things, including web hosting. I'd like to remind you about Arvixe, a great web hosting provider for Windows (for ASP.NET) and Linux. For 48 hours, between Thursday November 24th at 00:00 PST (08:00 GMT/UTC) and Friday November 25th, Arvixe will be offering 50% off all of their shared hosting products. This will be for all new accounts, for life (as long as you continue to renew the account)!I've been using Arvixe for my websites for more than one year and a half now, and I highly recommend them. Here is an overview of what I get for a very good price:Unlimited diskspaceUnlimited data transferUnlimited domainsUnlimited POP3 and IMAP mailboxesUnlimited SQL Server 2008 databasesUnlimited MySQL databases.NET 1.1, 2, 3.5 and 4Dedicated application poolsFull trustIIS 7Daily backupsand more... And now, you can get that too for half the price. Just go to Arvixe.com and secure your own hosting account now by using the coupon code "Black Friday" during checkout.Disclaimer: the links to Arvixe are affiliate links that may bring me some money home if you sign up. Still, I recommend Arvixe because I use them and I'm very happy with what they offer.

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• How to manage focus for a small set of simple widgets

  - by Christoph

  I'm developing a set of simple widgets for a small (128x128) display. For example I'd like to have a main screen with an overlay menu which I can use to toggle visibilty of main screen elements. Each option would be an icon with a box around it while it is selected. Button (left, up, right, down, enter) events should be given to the widget that has "focus". Focus is a simple thing to understand when using a GUI, but I'm having trouble implementing this. Can you suggest a simple concept for managing focus and input events? I have these simple ideas: Only one widget can have focus, so I need a single pointer to that widget. When this widget gets some kind of "cycle" input (as in "highlight the next item in this list"), the focus is given to a different widget. a widget must have a way of telling the application which widget the focus is given to next. if a widget cannot give a "next focus" hint, the application must be able to figure out where the focus should go. Widgets are currently structured like this: A widget can have a parent, which is passed to the constructor. Widgets are created statically, as I want to avoid dynamic memory allocation (I only have 16kB of RAM and I'd like to have control over that). widgets have siblings, implemented as an intrusive linked list (they have a next member). A parent has a pointer to the head of its list of children. Input events are arguments to the widgets buttonEvent methods which can accept or ignore that event. If it ignores the event, it can pass the event to its parent. My Questions: How can I manage focus for these widgets? Am I making this too complicated?

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• Finding a way to simplify complex queries on legacy application

  - by glenatron

  I am working with an existing application built on Rails 3.1/MySql with much of the work taking place in a JavaScript interface, although the actual platforms are not tremendously relevant here, except in that they give context. The application is powerful, handles a reasonable amount of data and works well. As the number of customers using it and the complexity of the projects they create increases, however, we are starting to run into a few performance problems. As far as I can tell, the source of these problems is that the data represents a tree and it is very hard for ActiveRecord to deterministically know what data it should be retrieving. My model has many relationships like this: Project has_many Nodes has_many GlobalConditions Node has_one Parent has_many Nodes has_many WeightingFactors through NodeFactors has_many Tags through NodeTags GlobalCondition has_many Nodes ( referenced by Id, rather than replicating tree ) WeightingFactor has_many Nodes through NodeFactors Tag has_many Nodes through NodeTags The whole system has something in the region of thirty types which optionally hang off one or many nodes in the tree. My question is: What can I do to retrieve and construct this data faster? Having worked a lot with .Net, if I was in a similar situation there, I would look at building up a Stored Procedure to pull everything out of the database in one go but I would prefer to keep my logic in the application and from what I can tell it would be hard to take the queried data and build ActiveRecord objects from it without losing their integrity, which would cause more problems than it solves. It has also occurred to me that I could bunch the data up and send some of it across asynchronously, which would not improve performance but would improve the user perception of performance. However if sections of the data appeared after page load that could also be quite confusing. I am wondering whether it would be a useful strategy to make everything aware of it's parent project, so that one could pull all the records for that project and then build up the relationships later, but given the ubiquity of complex trees in day to day programming life I wouldn't be surprised if there were some better design patterns or standard approaches to this type of situation that I am not well versed in.

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• Determinism in multiplayer simulation with Box2D, and single computer

  - by Jake

  I wrote a small test car driving multiplayer game with Box2D using TCP server-client communcations. I ran 1 instance of server.exe and 2 instance of client.exe on the same machine that I code and compile the executables. I type inputs (WASD for a simple car movement) into one of the 2 clients and I can get both clients to update the simulation. There are 2 cars in the simulation. As long as the cars do not collide, I get the same identical output on both client.exe. I can run the car(s) around for as long as I could they still update the same. However, if I start to collide the cars, very quickly they go out of sync. My tools: Windows 7, C++, MSVS 2010, Box2D, freeGlut. My Psuedocode: // client.exe void timer(int value) { tcpServer.send(my_inputs); foreach(i = player including myself) inputs[i] = tcpServer.receive(); foreach(i = player including myself) players[i].process(inputs[i]); myb2World.step(33, 8, 6); // Box2D world step simulation foreach(i = player including myself) renderer.render(player[i]); glutTimerFunc(33, timer, 0); } // server.exe void serviceloop { while(all clients alive) { foreach(c = clients) tcpClients[c].receive(&inputs[c]); // send input of each client to all clients foreach(source = clients) { foreach(dest = clients) { tcpClients[dest].send(inputs[source]); } } } } I have read all over the internet and SE the following claims (paraphrased): Box2D is deterministic as long as floating point architecture/implementation is the same. (For any deterministic engine) Determinism is gauranteed if playback of recorded inputs is on the same machine with exe compiled using same compiler and machine. Additionally my server.exe and client.exe gameloop is single thread with blocking socket calls and fixed time step. Question: Can anyone explain what I did wrong to get different Box2D output?

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• Which software to keep track of my project?

  - by Exa

  I'm about to start the first real phase of my game development which will consist of the acquisition of information, resources and the definition of where I want to go and what I will need for that. I just want to make sure that I'm prepared as best as possible before I actually start development. I don't like the thought of using Microsoft Word or Excel for my project management... I already worked with MS Project but I don't think it fits my needs. I need a software where I can easily maintain project steps, milestones, important issues, information about technologies and engines I use, as well as simple notes and thoughts I just want to write down. I usually prefer a whiteboard for stuff like that but unfortunately it's not a persistent way of storing. ;) Also writing it down the old-school way is something I can think of, but only for quick notes... Which software do you use for that? Are there commonly used programs? Is there any free software at all?

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• Web.NET event coming in October

  - by Chris Massey

  If you’re a web developer in Europe (or would like an excuse to travel to Europe), you should definitely take a look at the Web.NET event coming in October. It’s being organized by two Italian web maestros (Simone Chiaretta and Ugo Lattanzi) and the session list looks fantastic. The event site pretty much speaks for itself, but here’s a quick version: It’s a free one-day event on October 20th, with a huge variety of great sessions by great speakers, all 100% focused on web development. There’s a pizza-fuelled hackathon in the evening; thrills, spills and hot new skills. It’s a great chance to network with the local (in relative terms) web development community. It’s free (although all donations are very greatly appreciated). It’s in Milan, darling. Here’s what you need to do: Go and register on www.webnetconf.eu, and vote on which sessions you think look the most interesting. I know this will be a difficult process – it’s *very* hard to choose – but persevere! Grab your place when the free tickets become available early next month (places are limited). Come to Milan in October, learn some new skills, meet some great people, and maybe build something awesome if you feel like staying up late. I’ll be there, and hopefully I’ll see you on the day.

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• Mapping XFCE4/xRDP sessions to users

  - by garrilla

  I have Ubuntu 13.10 with Xubuntu Desktop - XFCE4. I'm trying to use XDRP to allow MS Windows users to login to the machine with their own user. I've been a lot around the houses with this! I've find two half-way solutions, but can't get them to work as I'd like... 1) in /etc/xrdp/xrdp.ini I set the port to -1 [xrdp1] name=sesman-Xvnc lib=libvnc.so username=ask password=ask ip=127.0.0.1 port=-1 each time any user logs on they get a new session - they can never go back to their original session 2) in /etc/xrdp/xrdp.ini I set the port to 5912 (e.g) [xrdp1] name=sesman-Xvnc lib=libvnc.so username=ask password=ask ip=127.0.0.1 port=5912 each time any user logs on they always log on to the same session irrespective of their logon details ??) I found a mid-way solution, to create a lot of sessions by adding adding additional options in the xrdp.ini e.g. [xrdp8] name=Bob's Logon lib=libvnc.so username=ask password=ask ip=127.0.0.1 port=5913 [xrdp9] name=Jill's Logon lib=libvnc.so username=ask password=ask ip=127.0.0.1 port=5914 and so on, but he problem with this is that Jill can still log into Bob's remote session ??? Is it possible to to do what I'm trying to do? Maybe I have to use different tools?

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• Scanline filling of polygons that share edges and vertices

  - by Belgin

  In this picture (a perspective projection of an icosahedron), the scanline (red) intersects that vertex at the top. In an icosahedron each edge belongs to two triangles. From edge a, only one triangle is visible, the other one is in the back. Same for edge d. Also, in order to determine what color the current pixel should be, each polygon has a flag which can either be 'in' or 'out', depending upon where on the scanline we currently are. Flags are flipped according to the intersection of the scanline with the edges. Now, as we go from a to d (because all edges are intersected with the scanline at that vertex), this happens: the triangle behind triangle 1 and triangle 1 itself are set 'in', then 2 is set in and 1 is 'out', then 3 is set 'in', 2 is 'out' and finally 3 is 'out' and the one behind it is set 'in', which is not the desired behavior because we only need the triangles which are facing us to be set 'in', the rest should be 'out'. How do process the edges in the Active Edge List (a list of edges that are currently intersected by the scanline) so the right polys are set 'in'? Also, I should mention that the edges are unique, which means there exists an array of edges in the data structure of the icosahedron which are pointed to by edge pointers in each of the triangles.

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• Is Play Framework good for doing some logic parallely?

  - by pmichna

  I'm going to build a web application that's going to host urban games. A user visits my website, clicks "Start game" and starts receiving some SMS messages when gets to some location and has to answer them to get points. My question: is Play suitable for this kind of application? From what I've read I know for sure it's ok for traditional web applications: user interface for same data storage and manipulation. But what if after clicking the "start button" some logic has to go on its own course? How would I handle parallely checking geolocation of the players (I have API for that)? I guess in some threads that would ping them every ~5 sec. and do some processing but is it possible to just "disconnect" them from the main user interface? So to sum up: I want an application written in Play that starts a separate thread for a game after clicking "start game" and other users are able to view their data (statisctics etc.), while the threads work their way with the game logic. I found something like jobs but they are documented for version 1.2 (current one is 2.2). Sorry for my somewhat fuzzy explenation, I tried to do my best.

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• Unity throws SynchronizationLockException while debugging

  - by pjohnson

  I've found Unity to be a great resource for writing unit-testable code, and tests targeting it. Sadly, not all those unit tests work perfectly the first time (TDD notwithstanding), and sometimes it's not even immediately apparent why they're failing. So I use Visual Studio's debugger. I then see SynchronizationLockExceptions thrown by Unity calls, when I never did while running the code without debugging. I hit F5 to continue past these distractions, the line that had the exception appears to have completed normally, and I continue on to what I was trying to debug in the first place.In settings where Unity isn't used extensively, this is just one amongst a handful of annoyances in a tool (Visual Studio) that overall makes my work life much, much easier and more enjoyable. But in larger projects, it can be maddening. Finally it bugged me enough where it was worth researching it.Amongst the first and most helpful Google results was, of course, at Stack Overflow. The first couple answers were extensive but seemed a bit more involved than I could pull off at this stage in the product's lifecycle. A bit more digging showed that the Microsoft team knows about this bug but hasn't prioritized it into any released build yet. SO users jaster and alex-g proposed workarounds that relieved my pain--just go to Debug|Exceptions..., find the SynchronizationLockException, and uncheck it. As others warned, this will skip over SynchronizationLockExceptions in your code that you want to catch, but that wasn't a concern for me in this case. Thanks, guys; I've used that dialog before, but it's been so long I'd forgotten about it.Now if I could just do the same for Microsoft.CSharp.RuntimeBinder.RuntimeBinderException... Until then, F5 it is.

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• XNA Skinned Animated Mesh Rendering Exported from Maya

  - by Devin Garner

  I am working on translating an old RTS game engine I wrote from DirectX9 to XNA. My old models didn't have animation & are an old format, so I'm trying with an FBX file. I temporarily "borrowed" a model from League of Legends just to test if my rendering is working correctly. I imported the mesh/bones/skin/animation into Maya 2012 using an "unnamed" 3rd-party import tool. (obviously I'll have to get legit models later, but I just want to test if my programming is correct). Everything looks correct in maya and it renders the animations flawlessly. I exported everything into a single FBX file (with only a single animation). I then tried to load this model using the example at the following site: http://create.msdn.com/en-US/education/catalog/sample/skinned_model With my exported FBX, the animation looks correct for most of the frames, however at random times it screws up for a split second. Basically, the body/arms/head will look right, but the leg/foot will shoot out to a random point in space for a second & then go back to the normal position. The original FBX from the sample looks correct in my program. It seems odd that my model was imported into maya wrong, since it displays fine in Maya. So, I'm thinking either I'm exporting it wrong, or the sample code is bad & the model from the sample caters to the samples bad code. I'm new to 3D programming & maya, so chances are I'm doing something wrong in the export. I'm using mostly the defaults, but I've tried all 3 interpolation modes (quaternion, euler, resample). Thanks

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