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• .NET 4.5 now supported with Windows Azure Web Sites

  - by ScottGu

  This week we finished rolling out .NET 4.5 to all of our Windows Azure Web Site clusters.  This means that you can now publish and run ASP.NET 4.5 based apps, and use  .NET 4.5 libraries and features (for example: async and the new spatial data-type support in EF), with Windows Azure Web Sites.  This enables a ton of really great capabilities - check out Scott Hanselman’s great post of videos that highlight a few of them. Visual Studio 2012 includes built-in publishing support to Windows Azure, which makes it really easy to publish and deploy .NET 4.5 based sites within Visual Studio (you can deploy both apps + databases).  With the Migrations feature of EF Code First you can also do incremental database schema updates as part of publishing (which enables a really slick automated deployment workflow). Each Windows Azure account is eligible to host 10 free web-sites using our free-tier.  If you don’t already have a Windows Azure account, you can sign-up for a free trial and start using them today. In the next few days we’ll also be releasing support for .NET 4.5 and Windows Server 2012 with Windows Azure Cloud Services (Web and Worker Roles) – together with some great new Azure SDK enhancements.  Keep an eye out on my blog for details about these soon. Hope this helps, Scott P.S. In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• Copy or Export Byobu screen?

  - by kmassada

  One of the best things about byobu is the scrollback feature in a given session. I have been working on something, and I have tons of lines in the current scrollback session and I want to copy everything to a file, how to?? According to the screen home page, looks like you can do this? but when I'm done I do a search for all those files, can't find them. C-a h (hardcopy) Write a hardcopy of the current window to the file "hardcopy.n". C-a H (log) Begins/ends logging of the current window to the file "screenlog.n". For the screen commands to work, I have to be in screen mode, I believe, and not sure how to check that? kenneth@dv7:~$ ps -ef | grep byobu kenneth 16245 16173 0 05:18 pts/12 00:00:00 grep --color=auto byobu kenneth 25935 1 0 Dec14 ? 00:21:26 /usr/bin/xfce4-terminal -x byobu-launcher kenneth 25938 25935 0 Dec14 pts/0 00:00:00 tmux -2 -f /usr/share/byobu/profiles/tmuxrc new-session /usr/bin/byobu-shell kenneth 25962 1 1 Dec14 ? 00:37:31 tmux -2 -f /usr/share/byobu/profiles/tmuxrc new-session /usr/bin/byobu-shell kenneth 25963 25962 0 Dec14 pts/1 00:00:00 sh -c /usr/bin/byobu-shell This is from the byoby man page and I absolutely don't know what it does? I tried, it, and looked around, can't tell. Ctrl-a ~ - Save the current window's scrollback buffer there's also enter, copy mode, select with space key, and press enter to copy, I do that, the screen displays gibberish for 10 seconds refreshes, done. cat >> ~/log.output << COMM --paste using ctrl a ] I think-- COMM this confirms the copy paste works, but when I press enter, nothing get saved to that log file, I've checked, I do have write privileges in my home directory. lol the select all, from the xfce4-terminal doesn't go far enough, and scrolling back with the mouse, well won't work, no need to try it, I know byobu buffer doesn't work like that.

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• How to use rhythmbox-client on LAN?

  - by Kaustubh P

  A few days ago I had asked this question, and according to one suggestion, used rhythmote. It is a web-interface to change songs on a rhythmbox playing on some PC. However, its not what I had thought of, and I stumbled upon documentation for rhythmbox-client. I tried a few ways of using it, but was unsuccessful. Let me show you a few ways of how I did it. The rhythmbox is running at address 192.168.1.4, lets call it jukebox. Passing the address as a parameter Hoping that I would be able to see and browse through songs on the jukebox rhythmbox-client 192.168.1.4 But, I get this message (rhythmbox-client:8370): Rhythmbox-WARNING **: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. (rhythmbox-client:8370): Rhythmbox-WARNING **: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. SSH ssh -l jukebox 192.168.1.4 rhythmbox-client --print-playing Which spat this at me: (rhythmbox-client:9389): Rhythmbox-WARNING **: /bin/dbus-launch terminated abnormally with the following error: Autolaunch error: X11 initialization failed. rhythmbox-client as root gksudo rhythmbox-client 192.168.1.4 A rhythmbox client comes up, but with no music shown in the library. I am guessing this is running on my own computer. Can anyon tell me how rhythmbox-client is to be run, and is it even correct of me to think that I can get a rhythmbox window showing the songs on the jukebox? PS: There were a few other solutions mentioned, but I want to evaluate each and every one of them. Thanks.

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• Where to find other versions of Opera browser as deb packages?

  - by cipricus

  I used Opera mainly for the Unite feature now to be abandoned. It is missing in v. 12. Some say its features will re-emerge in future extensions etc. Until then, Unite is still accessible in v. 11. Where do I get the v.11 deb? P.S. In fact it seems that opera unite (at least in its older form) is dying while I am editing this question. Access to opera-unite applications from within opera-unite is poor or absent. This issue is obscure to me for now (31.08.2012) because yesterday I have installed v12 in Windows OS (with opera-unite and basic applications - file sharing and media player - already installed) and it is still working (server is working). The v12 Ubuntu version came today without unite, and after installing v11 (which has unite) I could not get applications (file sharing, etc). But they are still available: here and after downloading these files which have te .ua extension, they can be installed by opening them with Opera (v.11) But as opera-unite is no longer supported, it is possible that the server that provides the file sharing etc will soon be unaccessible. Even if that is the case the question should maybe not be closed at it has a general usefulness independently of the unite issue.

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• Notify-osd notifications appear unthemed in top-left corner (ubuntu 13.10)

  - by Wehlutyk

  Problem I recently upgraded from 13.04 to 13.10, and suddenly notification bubbles don't appear themed as usual in the upper right corner, but they appear as white text on blue background in the upper-left corner. It looks like this: Unsuccesful attempts to fix it I tried reinstalling unity, notify-osd, ubuntu-desktop removed notification-daemon which was installed, none of that fixes it. In fact running ps aux | grep notify-osd shows that notify-osd isn't even running. But when I try to start it manually by running /usr/lib/x86_64-linux-gnu/notify-osd I get: ** (notify-osd:4618): WARNING **: Another instance has already registered org.freedesktop.Notifications ** (notify-osd:4618): WARNING **: Could not register instance If I understand well, the instance is registered by the /usr/share/dbus-1/services/org.freedesktop.Notifications.service file, which right now contains: [D-BUS Service] Name=org.freedesktop.Notifications Exec=/usr/lib/x86_64-linux-gnu/notify-osd Renaming or deleting that file (and rebooting) has no effect whatsoever (and it is not recreated automatically). This is not a duplicate of No notifications from notify-osd on 13.10 (and by the way I purged gnome-flashback-session along with notification-daemon) Question(s) How can I debug this? How can I get notifications to come back to normal? If additional debug information is needed, I'll be happy to add it (just that I can't find any more).

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• Applications are now open for the Microsoft Accelerator for Windows Azure - 2013

  - by ScottGu

  In October, I introduced the finalists for the Microsoft Accelerator for Windows Azure, powered by TechStars. Over the past couple of months, these startups have been mentored by business and technology leaders, met with investors, learned from each other, and, most importantly, been building great products. You can learn more about the startups in the first class and how they’re using Windows Azure here. As the first class approaches Demo Day on January 17th, I’m happy to announce that today we are opening applications for the second class of the Microsoft Accelerator for Windows Azure. The second class will begin on April 1,, 2013 and conclude with Demo Day on June 26, 2013. If you are currently working at a startup or considering founding your own company, I encourage you to apply. We’re accepting applications through February 1st, 2013. You can find more information about the Accelerator and the application process here. It’s been truly inspiring to work with the current class of startups. This inaugural class has brought with them incredible energy and innovation and I look forward to reviewing the applications for this next class. Hope this helps, Scott P.S. In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• How should I design a correct OO design in case of a Business-logic wide operation

  - by Mithir

  EDIT: Maybe I should ask the question in a different way. in light of ammoQ's comment, I realize that I've done something like suggested which is kind of a fix and it is fine by me. But I still want to learn for the future, so that if I develop new code for operations similar to this, I can design it correctly from the start. So, if I got the following characteristics: The relevant input is composed from data which is connected to several different business objects All the input data is validated and cross-checked Attempts are made in order to insert the data to the DB All this is just a single operation from Business side prospective, meaning all of the cross checking and validations are just side effects. I can't think of any other way but some sort of Operator/Coordinator kind of Object which activates the entire procedure, but then I fall into a Functional-Decomposition kind of code. so is there a better way in doing this? Original Question In our system we have many complex operations which involve many validations and DB activities. One of the main Business functionality could have been designed better. In short, there were no separation of layers, and the code would only work from the scenario in which it was first designed at, and now there were more scenarios (like requests from an API or from other devices) So I had to redesign. I found myself moving all the DB code to objects which acts like Business to DB objects, and I've put all the business logic in an Operator kind of a class, which I've implemented like this: First, I created an object which will hold all the information needed for the operation let's call it InformationObject. Then I created an OperatorObject which will take the InformationObject as a parameter and act on it. The OperatorObject should activate different objects and validate or check for existence or any scenario in which the business logic is compromised and then make the operation according to the information on the InformationObject. So my question is - Is this kind of implementation correct? PS, this Operator only works on a single Business-wise Operation.

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• .NET 4.5 agora é suportado nos Web Sites da Windows Azure

  - by Leniel Macaferi

  Nesta semana terminamos de instalar o .NET 4.5 em todos os nossos clusters que hospedam os Web Sistes da Windows Azure. Isso significa que agora você pode publicar e executar aplicações baseadas na ASP.NET 4.5, e usar as bibliotecas e recursos do .NET 4.5 (por exemplo: async e o novo suporte para dados espaciais (spatial data type no Entity Framework), com os Web Sites da Windows Azure. Isso permite uma infinidade de ótimos recursos - confira o post de Scott Hanselman com vídeos (em Inglês) que destacam alguns destes recursos. O Visual Studio 2012 inclui suporte nativo para publicar uma aplicação na Windows Azure, o que torna muito fácil publicar e implantar sites baseados no .NET 4.5 a partir do Visual Studio (você pode publicar aplicações + bancos de dados). Com o recurso de Migrações da abordagem Entity Framework Code First você também pode fazer atualizações incrementais do esquema do banco de dados, como parte do processo de publicação (o que permite um fluxo de trabalho de publicação extremamente automatizado). Cada conta da Windows Azure é elegível para hospedar até 10 web-sites gratuitamente, usando nossa camada Escalonável "Compartilhada". Se você ainda não tem uma conta da Windows Azure, você pode inscrever-se em um teste gratuito para começar a usar estes recursos hoje mesmo. Nos próximos dias, vamos também lançar o suporte para .NET 4.5 e Windows Server 2012 para os Serviços da Nuvem da Windows Azure (Web e Worker Roles) - juntamente com algumas novas e ótimas melhorias para o SDK da Windows Azure. Fique de olho no meu blog para mais informações sobre estes lançamentos em breve. Espero que ajude, - Scott PS Além do blog, eu também estou agora utilizando o Twitter para atualizações rápidas e para compartilhar links. Siga-me em: twitter.com/ScottGu Texto traduzido do post original por Leniel Macaferi.

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• Isometric displaying two different images in different positions

  - by Canvas

  I'm creating a simple Isometric game using HTML5 and Javascript, but I can't seem to get the display to work, at the moment i have 9 tiles that have X and Y positions and the player has a X and Y position, the players X and Y properties are set to 100, and the tiles are as shown tiles[0] = new Array(3); tiles[1] = new Array(3); tiles[2] = new Array(3); tiles[0][0] = new point2D( 100, 100); tiles[0][1] = new point2D( 160, 100); tiles[0][2] = new point2D( 220, 100); tiles[1][0] = new point2D( 100, 160); tiles[1][1] = new point2D( 160, 160); tiles[1][2] = new point2D( 220, 160); tiles[2][0] = new point2D( 100, 220); tiles[2][1] = new point2D( 160, 220); tiles[2][2] = new point2D( 220, 220); Now I use this method to work out the isometric position function twoDToIso( point ) { var cords = point2D; cords.x = point.x - point.y; cords.y = (point.x + point.y) / 2; return cords; } point2D is function point2D( x, y) { this.x = x; this.y = y; } Now this i'm sure does work out the correct positioning, but here is the output Isometric view I just need to move my player position a tiny bit, but is that the best way to display my player position in the right position? Canvas P.S. the tile width is 120 and height is 60 and the player is width 30 by height 15

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• Problem with SLATEC routine usage with gfortran

  - by user39461

  I am trying to compute the Bessel function of the second kind (Bessel_y) using the SLATEC's Amos library available on Netlib. Here is the SLATEC code I use. Below I have pasted my test program that calls SLATEC routine CBESY. PROGRAM BESSELTEST IMPLICIT NONE REAL:: FNU INTEGER, PARAMETER :: N = 2, KODE = 1 COMPLEX,ALLOCATABLE :: CWRK (:), CY (:) COMPLEX:: Z, ci INTEGER :: NZ, IERR ALLOCATE(CWRK(N), CY(N)) ci = cmplx (0.0, 1.0) FNU = 0.0e0 Z = CMPLX(0.3e0, 0.4e0) CALL CBESY(Z, FNU, KODE, N, CY, NZ, CWRK, IERR) WRITE(*,*) 'CY: ', CY WRITE(*,*) 'IERR: ', IERR STOP END PROGRAM And here is the output of the above program: CY: ( 5.78591091E-39, 5.80327020E-39) ( 0.0000000 , 0.0000000 ) IERR: 4 Ierr = 4 meaning there is some problem with the input itself. To be precise, the IERR = 4 means the following as per the header info in CBESY.f file: ! IERR=4, CABS(Z) OR FNU+N-1 TOO LARGE - NO COMPUTA- ! TION BECAUSE OF COMPLETE LOSSES OF SIGNIFI- ! CANCE BY ARGUMENT REDUCTION Clearly, CABS(Z) (which is 0.50) or FNU + N - 1 (which is 1.0) are not too large but still the routine CBESY throws the error message number 4 as above. The CY array should have following values for the argument given in above code: CY(1) = -0.4983 + 0.6700i CY(2) = -1.0149 + 0.9485i These values are computed using Matlab. I can't figure out what's the problem when I call CBESY from SLATEC library. Any clues? Much thanks for the suggestions/help. PS: if it is of any help, I used gfortran to compile, link and then create the SLATEC library file ( the .a file ) which I keep in the same directory as my test program above. shell command to execute above code: gfortran -c BesselTest.f95 gfortran -o a *.o libslatec.a a GD.

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• 36 Hour Free Offer: jQuery Fundamentals Training

  - by ScottGu

  Pluralsight (a great .NET training company) is offering the opportunity to watch their jQuery Fundamentals course for free for the next 36 hours. The course is presented by the most excellent Dan Wahlin and contains 5 hours of great end to end content.  Pluralsight will be offering this jQuery Fundamentals course for free until Thursday evening (9pm PST). Pluralsight has about 100 other great training courses available similar to this one.  They recently launched a new subscription plan that allows you to watch all of their courses online starting from $29 a month.  They also offer a 10 day free trial option that you can use to try it out.  You can learn more about it here. Free jQuery 1.5 Visual Cheat Sheet While on the topic of jQuery, I wanted to link to one other useful resource to download if you are using jQuery – which is a free jQuery PDF “cheat sheet” for the jQuery 1.5 APIs. You can download it for free here. Hope this helps, Scott P.S. I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• HTML5 or Javascript game engine to develop a browser game

  - by Jack Duluoz

  I would like to start developing a MMO browser game, like Travian or Ogame, probably involving also a bit of more sophisticated graphical features such as players interacting in real time with a 2d map or something like that. My main doubt is what kind of development tools I should use: I've a good experience with PHP and MySQL for the server side and Javascript (and jQuery) regarding the client side. Coding everything from scratch would be of course really painful so I was wondering if I should use a javascript game engine or not. Are there (possibly free) game engine you would recommend? Are they good enough to develop a big game? Also, I saw a lot of HTML5 games popping up lately but I'm now sure if using HTML5 is a good idea or not. Would you recommend it? What are the pro and cons about using HTML5? If you'd recommend it, do you have any good links regarding game development with HTML5? (PS: I know that HTML5 and a Javascript engine are not mutually exclusive, I just didn't know how to formulate a proper title since English is not my main language. So, please, answer addressing HTML5 and a game engine pro and cons separately)

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• Ubuntu backlight problem with Nvidia graphics

  - by Vladimir

  I have a laptop mySN QMG6 / Chiligreen Mobilitas NW which is Quanta TW9 barebone with intel i3 and nvidia 335m GT onboard. On ubuntu distros 10.04, 10.10, 11.04 and 11.10 i had problem with changing screen backlight with nouveau and nvidia drivers. FN+F4/F5 buttons did not change my brightness. I tried to edit xorg.conf, adding Option “RegistryDwords” “EnableBrightnessControl=1? Also tried to add some lines to grug acpi_osi="Linux" acpi_backlight=vendor Neither worked for me. Today I installed Ubuntu 12.04 beta2 and... With nouveau driver my FN key works, and changes the brightness (is it a new 3.0.22 linux kernel, or patched nouveau driver, i don't know). This is a big step forward. But, when installing proprietary nvidia driver (295.33) FN button stops working and i can't change brightness. I also tried workaround with xorg and grub with no result. Tried to install acpi from apt - no result. Is there anything left to try? I really need that nvidia driver working with FN keys, as i would like to have a working 3D acceleration. P.S. Does the nouveau driver has 3d acceleration like nvidia drivers??? If there is need to provide some log data, please write what should i print, as i'm a bit new to Ubuntu. P.P.S. Same problems i had with other Linux distros (Mint, Fedora and others) P.P.P.S. Other FN buttons work with both drivers (Mute, VOL UP/DOWN, WiFi on/off, Bluetooth, Sleep, Start/Pause, Stop, Next/Prev song)

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• Remapping keyboard to get extra cursor keys - but why stick to VIM standard hjkl

  - by Carlo V. Dango

  Inspired from VIM I recently remapped my keyboard layout to get extra keys for cursor movement. Being fluent in both QWERTY and DVORAK, it came quite natural to me to remap the DF and JK keys rather than the VIM standard hjkl keys. Here is my reasoning It enables me to quickly identify cursor keys since F and J are physically marked on my keyboard I'm using two hands for movement rather than one. I guess from DVORAK I learned to appreciate shifting between hands rather than using primarily one hand. It maps well with the Kinesis keyboard mapping http://www.kinesis-ergo.com/advantage.htm that I use occasionally. I feel I'm using my strongest fingers. I don't have to stretch my right index finger to read H as I would using the VIM layout. However, since I am still doing green field explorations on the cursor key remapping, I'd like others to share their experiences and/or criticize my suggested mapping. PS. If you want to toy around with my remapping using Autohotkey here is my script ; extra cursor keys. !d:: Send {Left} <^>!d:: Send {Left} !f:: Send {Right} <^>!f:: Send {Right} !j:: Send {Up} <^>!j:: Send {Up} !k:: Send {Down} <^>!k:: Send {Down} The question Is this mapping sane or is the VIM mapping superior?

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• SharePoint Apps and Windows Azure

  - by ScottGu

  Last Monday I had an opportunity to present as part of the keynote of this year’s SharePoint Conference.  My segment of the keynote covered the new SharePoint Cloud App Model we are introducing as part of the upcoming SharePoint 2013 and Office 365 releases.  This new app model for SharePoint is additive to the full trust solutions developers write today, and is built around three core tenants: Simplifying the development model and making it consistent between the on-premises version of SharePoint and SharePoint Online provided with Office 365. Making the execution model loosely coupled – and enabling developers to build apps and write code that can run outside of the core SharePoint service. This makes it easy to deploy SharePoint apps using Windows Azure, and avoid having to worry about breaking SharePoint and the apps within it when something is upgraded.  This new loosely coupled model also enables developers to write SharePoint applications that can leverage the full capabilities of the .NET Framework – including ASP.NET Web Forms 4.5, ASP.NET MVC 4, ASP.NET Web API, EF 5, Async, and more. Implementing this loosely coupled model using standard web protocols – like OAuth, JSON, and REST APIs – that enable developers to re-use skills and tools, and easily integrate SharePoint with Web and Mobile application architectures. A video of my talk + demos is now available to watch online: In the talk I walked through building an app from scratch – it showed off how easy it is to build solutions using new SharePoint application, and highlighted a web + workflow + mobile scenario that integrates SharePoint with code hosted on Windows Azure (all built using Visual Studio 2012 and ASP.NET 4.5 – including MVC and Web API). The new SharePoint Cloud App Model is something that I think is pretty exciting, and it is going to make it a lot easier to build SharePoint apps using the full power of both Windows Azure and the .NET Framework.  Using Windows Azure to easily extend SaaS based solutions like Office 365 is also a really natural fit and one that is going to offer a bunch of great developer opportunities.  Hope this helps, Scott  P.S. In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu

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• Python HTTPS requests (urllib2) fails on Ubuntu 12.04 without proxy

  - by Pablo

  I have an little app I wrote in Python and it used to work... until yesterday, when it suddenly started giving me an error in a HTTPS connection. I don't remember if there was an update, but both Python 2.7.3rc2 and Python 3.2 are failing just the same. I googled it and found out that this happens when people are behind a proxy, but I'm not (and nothing have changed in my network since the last time it worked). My syster's computer running windows and Python 2.7.2 has no problems (in the same network). response = urllib2.urlopen(url).read() File "/usr/lib/python2.7/urllib2.py", line 126, in urlopen return _opener.open(url, data, timeout) File "/usr/lib/python2.7/urllib2.py", line 400, in open response = self._open(req, data) File "/usr/lib/python2.7/urllib2.py", line 418, in _open '_open', req) File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain result = func(*args) File "/usr/lib/python2.7/urllib2.py", line 1215, in https_open return self.do_open(httplib.HTTPSConnection, req) File "/usr/lib/python2.7/urllib2.py", line 1177, in do_open raise URLError(err) urllib2.URLError: <urlopen error [Errno 8] _ssl.c:504: EOF occurred in violation of protocol> What's wrong? Any help is appreciated. PS.: Older python versions don't work either, not in my system and not in a live session from USB, but DO work in a Ubuntu 11.10 live session.

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• Code review “on a napkin” — could it be useful?

  - by gaRex

  Preconditions Team uses DVCS IDE supports comments parsing (like TODO and etc.) Tools like CodeCollaborator are expensive for budget Tools like gerrit are too complex for install or not usable Workflow Author publishes somewhere on central repo feature branch Reviewer fetch it and start review In case of some question/issue reviewer create comment with special label, like "BLA". Such label MUST not be in production code -- only on review stage: $somevar = 123; // BLA Why do echo this here? echo $somevar; When reviewer finish post comments -- it just commits with stupid message "comments" and pushes back Author pulls feature branch back and answer comments in similar way or improve code and push it back When "BLA" comments have gone we can think, that review has successfully finished. Author interactively rebases feature branch, stashes it to remove those "comment" commits and now is ready to merge feature to develop or make any action that usualy could be after successful internal review IDE support I know, that custom comment tags are possible in eclipse & netbeans. Sure it also should be in blablaStorm family. So my specific questions are Do you think this methodology is viable? Do you know something similar? What can be improved in it? ps: migrated from http://stackoverflow.com/questions/12692695/code-review-on-a-napkin-could-it-be-useful

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• How to get the path of a file after publishing my game

  - by NDraskovic

  I made a "game" for a college project that reads data from .txt file at startup and draws some models according to the data in that file. This is the code I use using (StreamReader sr = new StreamReader(@"C:\Users\User\Desktop\Linije.txt")) { String linija; while ((linija = sr.ReadLine()) != null) { red = linija.Split(','); model = red[0]; x = red[1]; y = red[2]; z = red[3]; elementi.Add(Convert.ToInt32(model)); podatci.Add(new Vector3(Convert.ToSingle(x),Convert.ToSingle(y),Convert.ToSingle(z))); } } As you see, this code fills some variables that are then used to define the model that will be drawn and the coordinates where it will be drawn. The problem that I'm having is that I don't know how to distribute that file to other computers (obviously on another computer it would have another path)? Do you have some advices on how to do this? P.S I tried to put it in the Content and set the Build Action on None, and I can see the file in the content directory, but when I change it, nothing happens (the models don't change as they should)

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• Why am I getting this "Connection to PulseAudio failed" error?

  - by Dave M G

  I have a computer that runs Mythbuntu 11.10. It has an external USB Kenwood Digital Audio device. When I open up pavucontrol, I get this message: If I do as the message suggests and run start-pulseaudio-x11, I get this output: $ start-pulseaudio-x11 Connection failure: Connection refused pa_context_connect() failed: Connection refused How do I correct this error? Update: Somewhere during the course of doing the suggested tests in the comments, a new audio device has now become visible in my sound settings. I have not attached or made any new device, so this must be the result of of some setting change. The device I use and know about is the Kenwood Audio device. The "GF108" device will play sound through the Kenwood anyway, but not reliably: Command line output as requested in the comments: $ ls -l ~/.pulse* -rw------- 1 mythbuntu mythbuntu 256 Feb 28 2011 /home/mythbuntu/.pulse-cookie /home/mythbuntu/.pulse: total 200 -rw-r--r-- 1 mythbuntu mythbuntu 8192 Oct 23 01:38 2b98330d36bf53bb85c97fc300000008-card-database.tdb -rw-r--r-- 1 mythbuntu mythbuntu 69 Nov 16 22:51 2b98330d36bf53bb85c97fc300000008-default-sink -rw-r--r-- 1 mythbuntu mythbuntu 68 Nov 16 22:51 2b98330d36bf53bb85c97fc300000008-default-source -rw-r--r-- 1 mythbuntu mythbuntu 49152 Oct 14 12:30 2b98330d36bf53bb85c97fc300000008-device-manager.tdb -rw-r--r-- 1 mythbuntu mythbuntu 61440 Oct 23 01:40 2b98330d36bf53bb85c97fc300000008-device-volumes.tdb lrwxrwxrwx 1 mythbuntu mythbuntu 23 Nov 16 22:50 2b98330d36bf53bb85c97fc300000008-runtime -> /tmp/pulse-EAwvLIQZn7e8 -rw-r--r-- 1 mythbuntu mythbuntu 77824 Nov 1 12:54 2b98330d36bf53bb85c97fc300000008-stream-volumes.tdb And yet more requested command line output: $ ps auxw|grep pulse 1000 2266 0.5 0.2 294184 9152 ? S<l Nov16 4:26 pulseaudio -D 1000 2413 0.0 0.0 94816 3040 ? S Nov16 0:00 /usr/lib/pulseaudio/pulse/gconf-helper 1000 4875 0.0 0.0 8108 908 pts/0 S+ 12:15 0:00 grep --color=auto pulse

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• What are the options for simple Ajax calls for a Java webapp?

  - by Cedric Martin

  I've got a very simple need and I don't know what are the options available. If I simplify, users see webpage like this server by a Java webapp server: [-] red [x] green [-] blue [-] yellow The selected color is green And then I want the user to be able to select the yellow color and have the part of the page containing the relevant text change to: [-] red [-] green [-] blue [x] yellow The selected color is yellow Basically I want something a bit more user friendly than simply using HTTP GET all the time. There shall be a lot of options the user can select from and this shall affect an (HTML formatted) text displayed on the page. And I want the user to see his change as soon as possible, without having the page to fully reload and without being redirected to another page. There shall be a client/server round-trip (the information to display depending on the options selected ain't available on the client-side so I cannot do it all in JavaScript in the browser). I'd like to use Ajax requests but I don't know which way to go: jQuery GWT something else What are my options and what would be the pros and cons of the various approach? P.S: I'm very familiar with Java (SCP since the last century and basically being a Java programmer for the last 12 years or so) but not familiar at all with JavaScript (though I did hack a few Ajaxy-calls years ago, way before great libraries existed).

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• PHP Aspect Oriented Design

  - by Devin Dixon

  This is a continuation of this Code Review question. What was taken away from that post, and other aspect oriented design is it is hard to debug. To counter that, I implemented the ability to turn tracing of the design patterns on. Turning trace on works like: //This can be added anywhere in the code Run::setAdapterTrace(true); Run::setFilterTrace(true); Run::setObserverTrace(true); //Execute the functon echo Run::goForARun(8); In the actual log with the trace turned on, it outputs like so: adapter 2012-02-12 21:46:19 {"type":"closure","object":"static","call_class":"\/public_html\/examples\/design\/ClosureDesigns.php","class":"Run","method":"goForARun","call_method":"goForARun","trace":"Run::goForARun","start_line":68,"end_line":70} filter 2012-02-12 22:05:15 {"type":"closure","event":"return","object":"static","class":"run_filter","method":"\/home\/prodigyview\/public_html\/examples\/design\/ClosureDesigns.php","trace":"Run::goForARun","start_line":51,"end_line":58} observer 2012-02-12 22:05:15 {"type":"closure","object":"static","class":"run_observer","method":"\/home\/prodigyview\/public_html\/public\/examples\/design\/ClosureDesigns.php","trace":"Run::goForARun","start_line":61,"end_line":63} When the information is broken down, the data translates to: Called by an adapter or filter or observer The function called was a closure The location of the closure Class:method the adapter was implemented on The Trace of where the method was called from Start Line and End Line The code has been proven to work in production environments and features various examples of to implement, so the proof of concept is there. It is not DI and accomplishes things that DI cannot. I wouldn't call the code boilerplate but I would call it bloated. In summary, the weaknesses are bloated code and a learning curve in exchange for aspect oriented functionality. Beyond the normal fear of something new and different, what are other weakness in this implementation of aspect oriented design, if any? PS: More examples of AOP here: https://github.com/ProdigyView/ProdigyView/tree/master/examples/design

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• Declarative programming vs. Imperative programming

  - by EpsilonVector

  I feel very comfortable with Imperative programming. I never have trouble expressing algorithmically what I want the computer to do once I figured out what is it that I want it to do. But when it comes to languages like SQL or Relational Algebra I often get stuck because my head is too used to Imperative programming. For example, suppose you have the relations band(bandName, bandCountry), venue(venueName, venueCountry), plays(bandName, venueName), and I want to write a query that says: all venueNames such that for every bandCountry there's a band from that country that plays in venue of that name. In my mind I immediately go "for each venueName iterate over all the bandCountries and for each bandCountry get the list of bands that come from it. If none of them play in venueName, go to next venueName. Else, at the end of the bandCountries iteration add venueName to the set of good venueNames". ...but you can't talk like that in SQL and I actually need to think about how to formulate this, with the intuitive Imperative solution constantly nagging in the back of my head. Did anybody else had this problem? How did you overcome this? Did you figured out a paradigm shift? Made a map from Imperative concepts to SQL concepts to translate Imperative solutions into Declarative ones? Read a good book? PS I'm not looking for a solution to the above query, I did solve it.

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• Depth interpolation for z-buffer, with scanline

  - by Twodordan

  I have to write my own software 3d rasterizer, and so far I am able to project my 3d model made of triangles into 2d space: I rotate, translate and project my points to get a 2d space representation of each triangle. Then, I take the 3 triangle points and I implement the scanline algorithm (using linear interpolation) to find all points[x][y] along the edges(left and right) of the triangles, so that I can scan the triangle horizontally, row by row, and fill it with pixels. This works. Except I have to also implement z-buffering. This means that knowing the rotated&translated z coordinates of the 3 vertices of the triangle, I must interpolate the z coordinate for all other points I find with my scanline algorithm. The concept seems clear enough, I first find Za and Zb with these calculations: var Z_Slope = (bottom_point_z - top_point_z) / (bottom_point_y - top_point_y); var Za = top_point_z + ((current_point_y - top_point_y) * Z_Slope); Then for each Zp I do the same interpolation horizontally: var Z_Slope = (right_z - left_z) / (right_x - left_x); var Zp = left_z + ((current_point_x - left_x) * Z_Slope); And of course I add to the zBuffer, if current z is closer to the viewer than the previous value at that index. (my coordinate system is x: left - right; y: top - bottom; z: your face - computer screen;) The problem is, it goes haywire. The project is here and if you select the "Z-Buffered" radio button, you'll see the results... (note that the rest of the options before "Z-Buffered" use the Painter's algorithm to correctly order the triangles. I also use the painter's algorithm -only- to draw the wireframe in "Z-Buffered" mode for debugging purposes) PS: I've read here that you must turn the z's into their reciprocals (meaning z = 1/z) before you interpolate. I tried that, and it appears that there's no change. What am I missing? (could anyone clarify, precisely where you must turn z into 1/z and where to turn it back?)

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• Can mediatomb VLC profile transcode audio as MP3 rather than mpga ?

  - by djangofan

  In the /etc/mediatomb/config.xml, can mediatomb VLC profile transcode audo as MP3 rather than mpga ? My Sony GoogleTV wont render streamed .avi files files with a mpga audio in them. The original files are Divx encoded with 128kbs MP3 audio but mediatomb is transcoding them. How can I change this? Any ideas? Can I turn off the audio and video transcoding somehow? I need some ideas to try. <profile name="vlcprof" enabled="yes" type="external"> <mimetype>video/mpeg</mimetype> <agent command="vlc" arguments="-I dummy %in --sout #transcode{venc=ffmpeg,vcodec=mp2v,vb=4096,fps=25,aenc=ffmpeg,acodec=mpga,ab=192,samplerate=44100,channels=2}:standard{access=file,mux=ps,dst=%out} vlc:quit"/> <buffer size="10485760" chunk-size="131072" fill-size="2621440"/> <accept-url>yes</accept-url> <first-resource>yes</first-resource> </profile> I know that that MP3 encoding support is external to FFmpeg and must be configured appropriately, but I have no idea how to handle that. I would guess I can work around that by somehow telling ffmpeg to not transcode the audio stream? Also, should I create a separate vlcprof entry for video/avi ? Can you create more than one profile for VLC in the config.xml for mediatomb?

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• What's a good approach to adding debug code to your application when you want more info about what's going wrong?

  - by Andrei

  When our application doesn't work the way we expect it to (e.g. throws exceptions etc.), I usually insert a lot of debug code at certain points in the application in order to get a better overview of what exactly is going on, what the values for certain objects are, to better trace where this error is triggered from. Then I send a new installer to the user(s) that are having the problem and if the problem is triggered again I look at the logs and see what they say. But I don't want all this debug code to be in the production code, since this would create some really big debug files with information that is not always relevant. The other problem is that our code base changes, and the next time, the same debug code might have to go in different parts of the application. Questions Is there a way to merge this debug code within the production code only when needed and have it appear at the correct points within the application? Can it be done with a version control system like git so that all would be needed is a git merge? P.S. The application I'm talking about now is .NET, written in C#.

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