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• Hello!

  - by barryoreilly

  After many months of deliberating I have finally gotten around to starting this blog! The reason for doing this is the large number of half finished articles lying around on my hard disk, unpublished and unloved. These articles have been of huge benefit to me, and have been written in an attempt to consolidate my own thinking, in order to help me structure my thoughts and ideas as I have tried to digest new ideas and understand abstract theories. It is my hope that by tidying up these articles and publishing them here that I can continue this learning process by getting feedback on the ideas from within the developer community. i have worked with .NET for 8 years now, and have worked with ASP.NET, SQL Server, Windows programming as well as general network administration. Since 2004 my focus has been on integration, web services, and more often than not Biztalk Server. The last two years have seen me focus on SOA and WCF, and the Managed Services Engine, so this is probably where the main focus of the blog will to start with, but there are so many fun things to play with these days that i have no idea where it will end up.....   Barry

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• Blender/POV-Ray differences

  - by Magnap

  I am currently following a tutorial for Blender, but came across POV-Ray mentioned as a renderer. After having researched it a bit, i took a look at it's scene description (scripting) language, which kind of fascinated me. But, after even more googling of the topic, i am still wondering: What are the main and key differences between working with 3D in resp. Blender and POV-Ray? PS: I suspect this might not be the best place for a question such as this, but it seems to be the most suitable.

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• CUDA 4.1 Particle Update

  - by N0xus

  I'm using CUDA 4.1 to parse in the update of my Particle system that I've made with DirectX 10. So far, my update method for the particle systems is 1 line of code within a for loop that makes each particle fall down the y axis to simulate a waterfall: m_particleList[i].positionY = m_particleList[i].positionY - (m_particleList[i].velocity * frameTime * 0.001f); In my .cu class I've created a struct which I copied from my particle class and is as follows: struct ParticleType { float positionX, positionY, positionZ; float red, green, blue; float velocity; bool active; }; Then I have an UpdateParticle method in the .cu as well. This encompass the 3 main parameters my particles need to update themselves based off the initial line of code. : __global__ void UpdateParticle(float* position, float* velocity, float frameTime) { } This is my first CUDA program and I'm at a loss to what to do next. I've tried to simply put the particleList line in the UpdateParticle method, but then the particles don't fall down as they should. I believe it is because I am not calling something that I need to in the class where the particle fall code use to be. Could someone please tell me what it is I am missing to get it working as it should? If I am doing this completely wrong in general, the please inform me as well.

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• Integrating Amazon EC2 in Java via NetBeans IDE

  - by Geertjan

  Next, having looked at Amazon Associates services and Amazon S3, let's take a look at Amazon EC2, the elastic compute cloud which provides remote computing services. I started by launching an instance of Ubuntu Server 14.04 on Amazon EC2, which looks a bit like this in the on-line AWS Management Console, though I whitened out most of the details: Now that I have at least one running instance available on Amazon EC2, it makes sense to use the services that are integrated into NetBeans IDE:  I created a new application with one class, named "AmazonEC2Demo". Then I dragged the "describeInstances" service that you see above, with the mouse, into the class. Then the IDE automatically created all the other files you see below, i.e., 4 Java classes and one properties file: In the properties file, register the access ID and secret keys. These are read by the other generated Java classes. Signing and authentication are done automatically by the code that is generated, i.e., there's nothing generic you need to do and you can immediately begin working on your domain-specific code. Finally, you're now able to rewrite the code in "AmazonEC2Demo" to connect to Amazon EC2 and obtain information about your running instance: public class AmazonEC2Demo { public static void main(String[] args) { String instanceId1 = "i-something"; RestResponse result; try { result = AmazonEC2Service.describeInstances(instanceId1); System.out.println(result.getDataAsString()); } catch (IOException ex) { Logger.getLogger(AmazonEC2Demo.class.getName()).log(Level.SEVERE, null, ex); } } } From the above, you'll receive a chunk of XML with data about the running instance, it's name, status, dates, etc. In other words, you're now ready to integrate Amazon EC2 features directly into the applications you're writing, without very much work to get started. Within about 5 minutes, you're working on your business logic, rather than on the generic code that anyone needs when integrating with Amazon EC2.

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• Recently reloaded computer, now have trailing effect when windows overlap

  - by Tony

  I recently did a clean install of my home machine and I am having a weird graphical error where if I move one window across the top of another it leaves a trail: I have the most recent NVIDIA drivers installed and nothing new is installed on my machine than before the reload (and I never had this issue before). I have two monitors and it happens on both so I'm sure it isn't a hardware issue (the card and my main monitor are also both less than 6 months old) I've also noticed a ripple when scrolling down on web pages which I believe is related. Any ideas what might be causing this and solutions to fix it?

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• How to enable systemd instantiated service with puppet?

  - by Richard Pena

  I've got the following puppet service: service { "[email protected]": provider => systemd, ensure => running, enable => true, } When I try to apply this configuration on my client, it throws the following error: err: /Stage[main]//Node[puppetclient]/Service[[email protected]]/enable: change from false to true failed: Could not enable [email protected]: The service is running fine and I can make sure it's started on system boot by adding a symlink to getty.target.wants: ln -s /lib/systemd/system/[email protected] /etc/systemd/system/getty.target.wants/[email protected] Of source, I could go ahead and remove "enable = true" from the service definition and include a the symlink manually in the puppet configuration, but shouldn't puppet take care of this? Am I doing something terribly wrong?

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• Recommendations for a cloud/hosted server environment that can run different Windows VMs?

  - by Rory

  I currently have a colocated Win 2008 server that I use for hosting different windows VMs for testing: Win 2008, Win XP, Vista, Win7, Win 2000. I'd like to ditch the server and use something like Amazone AWS but the key thing is I need to be able to launch VMs for these different windows versions. AWS doesn't allow this currently. Can anyone recommend somewhere that I could use? The main reasons I want to get away from my own server are: administration: backup, windows updates, etc space: disk limitations mean I can't have all the VMs I want. I'd like to be able to pay for space incrementally. I'll typically only run 1-3 at a time but want lots of snapshots of different machines.

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• How do I interpolate air drag with a variable time step?

  - by Valentin Krummenacher

  So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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• Will SSD degrade when running VMWare Workstation from SSD?

  - by Andrey Botalov

  My main OS (Windows 7 or 8) is runned from SSD. I'd want to run Mac OS X 10.7 or 10.8 using VMWare workstation. I've heard that VMWare doesn't support TRIM and other things to optimize SSD usage. So SSD will quickly degrade if VM will be runned from SSD. Will it be better to put guest OS's files (.vmdk and the rest) to external HDD (connected through USB 2 or 3) instead of SSD? What advantages and disadvantages it will give? What if VM will be put to internal HDD? At what drive type performance of VM will be better?

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• Fix Fatal Error Condition showing system path

  - by JMC

  I've noticed there are a large number of servers running Magento Commerce that will return a fatal error showing the system path: Fatal error: Uncaught exception 'Exception' with message 'File '/usr/local/www/magento/data1702/media/css' does not exists.' in /usr/local/www/magento/data1702/lib/Varien/File/Transfer/Adapter/Http.php:96 Stack trace: #0 /usr/local/www/magento/data1702/get.php(205): Varien_File_Transfer_Adapter_Http->send('/usr/local/www/...') #1 /usr/local/www/magento/data1702/get.php(165): sendFile('/usr/local/www/...') #2 {main} thrown in /usr/local/www/magento/data1702/lib/Varien/File/Transfer/Adapter/Http.php on line 96 Magento as an application is generally good about supressing error messages. How can a linux server running apache be configured to avoid returning this error message since the app has problems suppressing it.

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• SharePoint 2010 MySites - Host on separate servers

  - by Chris W

  We're playing with the SP 2010 Beta ahead of a planned deployment later this year in an academic environment. We anticipate that the majority of traffic will be through MySites when everything is provisioned so we're looking at how we can plan our SP topology to scale nicely. An initial thought is to run the main portal on one server, host "Student" MySites on one server and "Staff" on another. Is it acutally possible to do this easily or are we going down a bad path? Specifically - can we have 2 different MySites site collections, each hosted on a dedicated server? If so, can we configure SharePoint to work out from the users's logon account type of user they are and route them to the correct server?

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• C++ function templates, function name confusion. This is funny [migrated]

  - by nashmaniac

  Alright so heres the program and works absolutely right #include <iostream> using namespace std; template <typename T> void Swap(T &a , T &b); int main(){ int i = 10; int j = 20; cout<<"i, j = " << i <<" , " <<j<<endl; Swap(i,j); cout<<"i, j = " << i <<" , " <<j<<endl; } template <typename T> void Swap(T &a , T &b){ T temp; temp = a ; a = b; b= temp; } but when I change the function's name from Swap to swap it generates an error saying error: call of overloaded 'swap(int&, int&)' is ambiguous| note: candidates are: void swap(T&, T&) [with T = int]| ||=== Build finished: 1 errors, 0 warnings ===| what happened is it a rule to start functions using templates to start with a capital letter ?

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• Cannot navigate Microsoft store after app install / update

  - by Jay

  Every time i go to the store and install a new app or update an existing one, I go back to the main screen of Store after a few screen refreshes. And then oddly, scrolling doesn't work and neither do the buttons, although the Tiles are fine. I then have to close the app and then re-open it and things are back to normal. I don't know if this is a weird bug or just the way it is. Could anyone please confirm and / or give a possible explanation?

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• Software solution from the 2000's, should I attempt to patch or remake the whole thing?

  - by ShadowScripter

  I was sent out to discuss a system that a certain company is currently using and what should be done with it. The company manufactures various carton displays. This system was developed to keep track of clients, orders and prices. Lots have happened since the system was created and the system is now, as the manager described it, "locked up" and "problematic", which I translate as "not dynamic" and "unstable". Some info about the system It was developed around the year 2000 Fairly small system, 2-5 users, 6 forms, ~8 tables with average quantities of data Built on early Visual Basic, forms created with the drag and drop design. Interface is basically just a window with a menu and some forms Uses MSSQL database (SQL2005 server) to store data and ODBC driver to query, data was migrated from excel before this system, and before excel it was handled, calculated and written by hand and paper Users work in Microsoft XP environment (and up) Their main problem is that they can't adjust and calculate prices, can't add new carton types etc, correctly anymore because they can't (or rather, they don't know how to) touch the data on the server. I suggested 3 possible solutions Attempt to patch the current system Create a fresh new interface (preferably similar environment, VB.net or VB based) Bring it back to an Excel solution, considering it is such a small system There might be more options, but these are the ones I could think of. My questions are What should I recommend and why? What is or could be the pros and cons of these alternatives? Are there other (possibly better) alternatives?

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• Conditional formatting & vlookup

  - by zorama

  Please help me with the formula: Main Sheet is Sheet2 B COLUMN I want to look up sheet1 A & B columns with Sheet2 A & B columns from 1 workbook that if sheet2 A are same/equal as Sheet1 A column, also if Sheet2 B column are same/equal as Sheet1 B column , how will I highlight the Sheet2 B column that if Sheet1 A & B + Sheet2 A & B are exactly equal . EXAMPLE: SHEET 1 SHEET 2 SHEET 2 Result A B A B A B CODE NO CODE NO CODE NO A 12 B 205 B 205 (highlight to red) B 105 B 20 B 20 (highlight to red) A 45 B 100 B 100 A 56 A 56 A 56 (highlight to red) A 78 B 25 B 25 A 100 A 12 A 12 (highlight to red) B 77 A 45 A 45 (highlight to red) B 108 A 20000 A 20000 B 20 B 205

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• Danger in running a proxy server? [closed]

  - by NessDan

  I currently have a home server that I'm using to learn more and more about servers. There's also the advantage of being able to run things like a Minecraft server (Yeah!). I recently installed and setup a proxy service known as Squid. The main reason was so that no matter where I was, I would be able to access sites without dealing with any network content filter (like at schools). I wanted to make this public but I had second thoughts on it. I thought last night that if people were using my proxy, couldn't they access illegal materials with it? What if someone used my proxy to download copyright material? Or launched an attack on another site via my proxy? What if someone actually looked up child pornography through the proxy? My question is, am I liable for what people use my proxy for? If someone does an illegal act and it leads to my proxy server, could I be held accountable for the actions done?

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• make gnome3 to work as I expect! [closed]

  - by gnome

  Possible Duplicate: How to revert to GNOME Classic? I don't like unity so I tried Ubuntu Gnome Remix 12.10. But I feel disappointed too. - No right click on desktop. (I know there is a way to enable it). - No icon on desktop. - I want to have "applications", "palces", "systems" on top panel as before. It just takes much more steps to arrive where I want to go in default gnome 3 settings. - It seems to me that for some applications, when it is maximalized, there is no close buttons or "restore to previous size" button. In fact, it has no title bar in this case, so I can't drag the title bar to restore its previous size and move the window. So I got 3 questions here: (for those who like the way gnome work before) What difference between gnome2 and gnome3 that you prefer the way it works in gnome2? How do you change it to work in the gnome2 way? I don't like the appearance in gnome3. For those who have tried to make your gnome3 looks good, could you share how you customize your gnome3 appearance? (this is for chatting only, not a real question) Why all the main OS (Windows, Mac, Some Linux) want to integrate Desktop and Tablet with focus on Tablet? (Which means that when it is installed on a desktop, it still has tablet appearance, which makes things strange.) Do they think the personal desktop PC will become less and less?

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• fresh install of ubuntu 12.04 using usb stick booted into tty1?

  - by croc

  I just installed ubuntu 12.04 alternate for the first time to give it a try using a usb stick burned with UnetBootIn. It installed without a problem. But it booted into a tty1 console without booting into a GUI. after loging into the tty1 console i typed 'unity'. it appeared that the system doesn't have unity desktop !!! How can it be solved ? My installation didn't show any error. Something worth mentioning: 1. during installation i had to choose an option saying 'customize the system to your needs' something like that i don't remember correctly with options 'SSH server','Mail Server', 'Ubuntu Desktop',.....,'Manual selection of packages' etc. I chose 'Ubuntu Desktop'. I haven't encountered something like this in ubuntu 11.04. to do an installation of alternate iso using UnetBootIn i used '12.04_Hdmedia' option of that software and had to change file extension of .ude to .udeb in /pool/main/l/linux that i found in Alternate ubuntu cdrom detect to go around with the cdrom detection problem. I have a 945G intel graphics.

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• Map localhost to IP address on Windows XP & Internet Explorer 7+?

  - by roblocop

  I'm trying to map 'localhost' to an IP address elsewhere on the network, say '10.0.1.1' for example. I've tried editing my hosts file, changing the entry from: 127.0.0.1 localhost to 10.0.1.1 localhost with no luck. The closest I've gotten is using DNS spoofing via Charles. Adding a DNS spoof entry mapping the host name 'localhost' to '10.0.1.1' works fine in Firefox, but fails in Internet Explorer, basically showing IE's 404 page. I'm wondering if there's some specific setting or way I can get DNS spoofing to work in IE? The main issue I'm trying to resolve is that our development environment points to 'localhost' and rather than setting the dev env up in a legacy Windows laptop to try and debug, point to a server that has it all setup and I can make the changes remotely.

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• nginx: URL rewrites and performance

  - by j0nes

  I have a website where I need to change the URL structure. The old URLs look like /olddir/part1_de.htm, the new ones will look like /newdir/sub/category/anotherpage.htm. There are a lot of URL rewrites I need to do, I assume about 500 distinct rewrites in the end. As my website gets quite a lot of traffic, my main concern is about performance at the moment. My questions are: I assume that for each request, the rewrites block will be parsed and the regex will be evaluated. Am I right? Will there be a performance penalty if I use these rewrites? Can nginx handle this? Are there any "best practices" to follow when doing a lot of rewrites?

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• Will the Driver Support for Intel HD Graphics be Improved in 12.10?

  - by Hiranya

  I recently installed Ubuntu 12.04 on a HP Pavilion dv4 laptop. This is a core i7 machine with Intel HD graphics and also a separate nVidia VGA card. I had a lot of issues getting Ubuntu 12.04 working on this system. First there were issues booting up the live CD for installation. I worked around that by using the 'nomodeset' option. Then I continued to have similar issues after installation has completed. So I had to permanently add the nomodeset option to my GRUB boot configuration. At the moment I have a working installation but there are many issues: Ubuntu GUI is a bit flaky at times. The mouse pointer goes on and off when hovering over certain icons. Certain things doesn't get rendered properly on the screen. I can't access any of the tty consoles. Hitting Ctrl+Alt+F[1-6] gives me a blank screen. And once that happens I can't even come back to the UI by hitting Ctrl+Alt+F7. I've realized that tty consoles are actually working. I just can't see the text. If I enter a command like 'sudo reboot' into the empty screen the machine reboots. Can't get external displays (monitors, projectors etc) working. But I think this is probably because the VGA out is wired to the nVidia card which is not being used by Linux. colord program crashes every now and then triggering a popup message. So my main question is, will the support for Intel HD graphics be improved in the next release? Or will I have to keep using the nomodeset option in the new release too? Also I appreciate if anybody can shed some light on any of the issues listed above. Thanks in advance.

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• is it okay to use random URLs instead of passwords?

  - by stew

  Is it considered "safe" to use URL constructed from random characters like this? http://example.com/EU3uc654/Photos I'd like to put some files/picture galleries on a webserver that are only to be accessed by a small group of users. My main concern is that the files should not get picked up by search-engines or curious power-users that poke around my site. I've set up an .htaccess file, just to notice that clicking on http://user:pass@url/ links doesn't work well with some browsers/email clients, prompting dialogs and warnings messages that confuse my not-too-computer-savy users.

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• How to start Sharepoint Development - Resources wanted [closed]

  - by user1249641

  I'm a apprentice for software development here in good ol' Germany and I've been doing fairly well with c#, asp.net mvc, entity framework and LINQ so far. My superiors want me to focus solely on our intranet development and Sharepoint development. They don't provide me with any resources to start. No books, no co-workers with actual webpart-dev-experience, seminars and the likes. There for it's do it on your own or die. I bought a book and started working through it on my virtual machine messing with the infrastructure and everything i can get a grip on. My main problem however stays the actual development. I have managed to write 2 webparts which can be used as a rudimentary ticket system(using WSP Builder and SP2007). But there it stops. Are there any comprehensive step by step tutorials or blogs out there, like the asp.net tutorials on www.asp.net which take you by the hand go over each step with you? Starting with the basic classes, going over custom css implementation, Jquery/Javascript ajax and async calls? No matter how trivial, I appreciate every help and hint you can give.

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• How to make a video card use DVI output by default in text mode?

  - by Igor Zinov'yev

  I have an ASUS ENGT440/DI1GD5 video card which has three outputs: DVI, D-Sub and HDMI. I am using both D-Sub and DVI, but my main monitor is connected to the DVI output. Everything works fine except for the text mode. The card somehow uses the D-Sub output in text mode when both monitors are connected (when I disconnect the D-Sub output and leave only the primary monitor connected to the DVI output, it's being used correctly). How do I make the card use only the DVI output (or both) in text mode?

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• Where and how does Kindle Cloud Reader store downloaded books, on a Windows 7 system?

  - by einpoklum

  I use Firefox and sometimes Chrome, on Windows 7. Amazon's in-browser Kindle Cloud Reader lets you "download" books for local/offline viewing. Where are these stored, given my OS+browser combination? I've searched the Users subdirectory for my user, and could not find a relevant (separate) file in there, specifically not in the Firefox and Chrome profile directories. To clarify, the files are obviously not downloaded as-is and are stored in some potentially-obfuscated format, possibly in the browser's local store and possibly elsewhere. The question is, where and how exactly? (This was the first of this question, but wasn't answered there since it was not the main focus of the question.)

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