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• why not use unmanaged safe code in c#

  - by user613326

  There is an option in c# to execute code unchecked. It's generally not advised to do so, as managed code is much safer and it overcomes a lot of problems. However I am wondering, if you're sure your code won't cause errors, and you know how to handle memory then why (if you like fast code) follow the general advice? I am wondering this since I wrote a program for a video camera, which required some extremely fast bitmap manipulation. I made some fast graphical algorithms myself, and they work excellent on the bitmaps using unmanaged code. Now I wonder in general, if you're sure you don't have memory leaks, or risks of crashes, why not use unmanaged code more often ? PS my background: I kinda rolled into this programming world and I work alone (I do so for a few years) and so I hope this software design question isn't that strange. I don't really have other people out there like a teacher to ask such things.

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• Terminal line glitches

  - by foxy

  I installed Ubuntu 11.10 mini + LXDE and wanted to make my command line different in terminal (than just plain white), so I added blue color to path line (everything until $ sign) and it works fine but I have two strange glitches now: When i write a line which is longer than terminal window, instead of starting at next line it starts at the same one, overwriting everything which was in there. Sometimes while navigating over previous commands (up/down arrow keys) some part of command gets stuck and is treated as part of prompt (the blue text), but it is white and is non-deletable and is not taken as part of command when i press enter. What could I mess up? The bad thing is that I don't remember what exactly did I change, but i'm sure I changed only one line in bashrc

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• Can't boot without Flash Drive plugged in

  - by vlad

  (Sorry for my bad English) I had Ubuntu 12.04 Beta installed on my computer. When 12.04 was finally released, I made a bootable USB Flash Drive using Startup Disk Creator. Then I decided to check if this drive works properly and to reinstall the system on my desktop. I must add, my desktop behaves a bit strange when it comes to bootable USB's, it recognizes them as HDD. In BIOS I changed priority of boot so USB Flash Drive (recognized as HDD) was first. Successfully booted, I installed Ubuntu. Everything worked fine, but... Now I cannot boot from my real HDD. Every time I want to boot, I put the USB Flash Drive into my computer, boot, safely remove it and everything works. What have I to do, to repair boot? Thank you for your time!

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• Combining Shared Secret and Username Token – Azure Service Bus

  - by Michael Stephenson

  As discussed in the introduction article this walkthrough will explain how you can implement WCF security with the Windows Azure Service Bus to ensure that you can protect your endpoint in the cloud with a shared secret but also flow through a username token so that in your listening WCF service you will be able to identify who sent the message. This could either be in the form of an application or a user depending on how you want to use your token. Prerequisites Before going into the walk through I want to explain a few assumptions about the scenario we are implementing but to keep the article shorter I am not going to walk through all of the steps in how to setup some of this. In the solution we have a simple console application which will represent the client application. There is also the services WCF application which contains the WCF service we will expose via the Windows Azure Service Bus. The WCF Service application in this example was hosted in IIS 7 on Windows 2008 R2 with AppFabric Server installed and configured to auto-start the WCF listening services. I am not going to go through significant detail around the IIS setup because it should not matter in relation to this article however if you want to understand more about how to configure WCF and IIS for such a scenario please refer to the following paper which goes into a lot of detail about how to configure this. The link is: http://tinyurl.com/8s5nwrz   The Service Component To begin with let's look at the service component and how it can be configured to listen to the service bus using a shared secret but to also accept a username token from the client. In the sample the service component is called Acme.Azure.ServiceBus.Poc.UN.Services. It has a single service which is the Visual Studio template for a WCF service when you add a new WCF Service Application so we have a service called Service1 with its Echo method. Nothing special so far!.... The next step is to look at the web.config file to see how we have configured the WCF service. In the services section of the WCF configuration you can see I have created my service and I have created a local endpoint which I simply used to do a little bit of diagnostics and to check it was working, but more importantly there is the Windows Azure endpoint which is using the ws2007HttpRelayBinding (note that this should also work just the same if your using netTcpRelayBinding). The key points to note on the above picture are the service behavior called MyServiceBehaviour and the service bus endpoints behavior called MyEndpointBehaviour. We will go into these in more detail later.   The Relay Binding The relay binding for the service has been configured to use the TransportWithMessageCredential security mode. This is the important bit where the transport security really relates to the interaction between the service and listening to the Azure Service Bus and the message credential is where we will use our username token like we have specified in the message/clientCrentialType attribute. Note also that we have left the relayClientAuthenticationType set to RelayAccessToken. This means that authentication will be made against ACS for accessing the service bus and messages will not be accepted from any sender who has not been authenticated by ACS.   The Endpoint Behaviour In the below picture you can see the endpoint behavior which is configured to use the shared secret client credential for accessing the service bus and also for diagnostic purposes I have included the service registry element. Hopefully if you are familiar with using Windows Azure Service Bus relay feature the above is very familiar to you and this is a very common setup for this section. There is nothing specific to the username token implementation here. The Service Behaviour Now we come to the bit with most of the username token bits in it. When you configure the service behavior I have included the serviceCredentials element and then setup to use userNameAuthentication and you can see that I have created my own custom username token validator.   This setup means that WCF will hand off to my class for validating the username token details. I have also added the serviceSecurityAudit element to give me a simple auditing of access capability. My UsernamePassword Validator The below picture shows you the details of the username password validator class I have implemented. WCF will hand off to this class when validating the token and give me a nice way to check the token credentials against an on-premise store. You have all of the validation features with a non-service bus WCF implementation available such as validating the username password against active directory or ASP.net membership features or as in my case above something much simpler.   The Client Now let's take a look at the client side of this solution and how we can configure the client to authenticate against ACS but also send a username token over to the service component so it can implement additional security checks on-premise. I have a console application and in the program class I want to use the proxy generated with Add Service Reference to send a message via the Azure Service Bus. You can see in my WCF client configuration below I have setup my details for the azure service bus url and am using the ws2007HttpRelayBinding. Next is my configuration for the relay binding. You can see below I have configured security to use TransportWithMessageCredential so we will flow the username token with the message and also the RelayAccessToken relayClientAuthenticationType which means the component will validate against ACS before being allowed to access the relay endpoint to send a message.     After the binding we need to configure the endpoint behavior like in the below picture. This is the normal configuration to use a shared secret for accessing a Service Bus endpoint.   Finally below we have the code of the client in the console application which will call the service bus. You can see that we have created our proxy and then made a normal call to a WCF service but this time we have also set the ClientCredentials to use the appropriate username and password which will be flown through the service bus and to our service which will validate them.     Conclusion As you can see from the above walkthrough it is not too difficult to configure a service to use both a shared secret and username token at the same time. This gives you the power and protection offered by the access control service in the cloud but also the ability to flow additional tokens to the on-premise component for additional security features to be implemented. Sample The sample used in this post is available at the following location: https://s3.amazonaws.com/CSCBlogSamples/Acme.Azure.ServiceBus.Poc.UN.zip

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• How can I make the camera return to the beginning of the terrain when it reaches the end?

  - by wbaccari

  How can I make the camera return to the beginning of the terrain when it reaches the end? I tried using the ICameraSceneNode*-setPosition(). if (camera->getPosition().X>1200.f) camera->setPosition(vector3df(1.f,1550.f,camera->getPosition().Z)); if (camera->getPosition().X<0.f) camera->setPosition(vector3df(1199.f,1550.f,camera->getPosition().Z)); if (camera->getPosition().Z>1200.f) camera->setPosition(vector3df(camera->getPosition().X,1550.f,1.f)); if (camera->getPosition().Z<0.f) camera->setPosition(vector3df(camera->getPosition().X,1550.f,1199.f)); It seems to work fine with a flat terrain (one shade of grey in heightmap) but it starts to produce a strange behavior as soon as i try to add some hills. Edit: The setPosition() call seems to perform a translation of the camera toward the new position, therefore the camera stops at the first obstacle it encounters on its way.

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• Unable to drag brush tool in Photoshop CS5 in 12.04

  - by Rodrane

  I was able to use Photoshop CS5 perfectly on Ubuntu 11.10. After upgraded to 12.04 I've noticed that when I try to use brush tool in by dragging the left mouse button I cannot get continous effect on photos. It only effects the area I click with mouse. In the screenshot all the time I was holding the left mouse button but it only affected the image once, creating dots instead of lines. At first I thought its something with Wine. I reinstalled it then deleted Photoshop in my ApplicationData folder (Windows keeps user software options in this folder). None of these worked. I tried on my laptop and this strange problem exists there too.

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• Restore database to the point of disaster

  - by TiborKaraszi

  This is really basic, but so often overlooked and misunderstood. Basically, we have a database, and something goes south. Can we restore all the way up to that point? I.e., even if the last backup (db or log) is earlier than the disaster? Yes, of course we can (unless for more extreme cases, read on), but many don't realize/do that, for some strange reason. This blog post was inspired from a thread in the MSDN forums, which exposed just this misunderstanding. Basically the scenario was that they...(read more)

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• Debian Stable vs Ubuntu LTS for Server?

  - by Kevin

  Quick question: Which is a better platform for a professional use server? Debian Stable or Ubuntu LTS? The third party software we plan to use, works on both. Which one is better on it own merits? Take into account things like the kernel (Ubuntu for example has its own custom kernel for servers), and other Ubuntu specific customizations. I keep switching back and forth, and I need to decide so I can recommend one or the other to a client. Right now, I think I am going to choose Debian Stable. Recently, I have had Ubuntu Server Edition 10.04.1 have a few strange issues... I have Ubuntu setup to do automatic updates via a simple script, and every few months or so, libapache2-mod-php5 gets removed because of conflicting packages... Thereby causing me to loose the php function of the web server. Debian Stable has not done anything like this.

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• Are there any good music mixers available, equivalent to Windows "MP3 Tunes"?

  - by RobinJ

  In Windows my dad used to have a program called MP3 Tunes. I have tried running it with Wine, and it worked. But strange things kept happening to the program, so it's not a reliable way to play music. Basically I just want to have 2 players (in a single window) with these features: Preloading tracks in a player without immediately starting them. Fading from one track to the other. A timer on each player. These features are also desired, but not required: Microphone input. Prelistening before loading a song in a player (through a seperate sound card). Pitch/Tempo control. Just being able to browse folders in the filesystem (without things like a music library). Here are some screenshots of the program to clarify what I'm looking for:

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• Green Website Design

  - by Christofian

  This is kindove a strange question, but... There was a site called Blackle ( http://www.blackle.com/) which "claimed" to save energy by using a black background (it doesn't: see here: http://skeptics.stackexchange.com/questions/4373/how-much-energy-does-displaying-a-webpage-with-a-black-background-actually-save). However, blackle and it's idea of "green website design" interested me, and I was wondering if there are any ways to design an energy saving website that actually save energy. If anyone knows of any, please post them here. If nobody has any, then I guess there isn't a way to save energy through website design...

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• Calculating 3D camera positions from a video

  - by Geotarget

  I need to calculate the 3D camera position and rotation for each frame in a given video. This is typically used for motion-tracking, and to insert 3D objects into a video. I'm currently using VideoTrace to calculate this for me, and I'm getting the data exported as a 3DS Maxscript file. However when I try to use the 3D camera rotations, I'm getting strange errors in my 3D calculations, as if there is an error with the 3x3 rotation matrices. Can you spot any error with the data itself? Or is it my other calculations that are erroneous? frame 1 rotation=(matrix3[-0.011938, 0.756018, -0.654442][-0.382040, -0.608284, -0.695727][-0.924068, 0.241718, 0.296091][0, 0, 0]).rotationpart position=[-0.767177, 0.308723, -0.232722] fov=57.352135 frame 2 rotation=(matrix3[-0.460922, -0.726580, -0.509541][-0.200163, 0.644491, -0.737947][ 0.864572, -0.238145, -0.442495][0, 0, 0]).rotationpart position=[-0.856630, 0.198654, -0.243853] fov=57.352135

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• Restore database to the point of disaster

  - by TiborKaraszi

  This is really basic, but so often overlooked and misunderstood. Basically, we have a database, and something goes south. Can we restore all the way up to that point? I.e., even if the last backup (db or log) is earlier than the disaster? Yes, of course we can (unless for more extreme cases, read on), but many don't realize/do that, for some strange reason. This blog post was inspired from a thread in the MSDN forums, which exposed just this misunderstanding. Basically the scenario was that they...(read more)

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• Listing Unix experience on resume.

  - by beacon

  I have been using Linux for quite a long time, and I am familiar with many Unix commands and tools. However, my only experience with Unix is through various Linux distributions. How should I communicate on my resume that I am familiar with the Unix command line even though I have never used a UNIX(R) system? It seems strange to me to list Unix when I've never used UNIX(R). Some people refer to Unix clones as *nix, but I'm afraid that might fly over the heads of some HR people.

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• Brightness issues on MSI GT683

  - by Mitu

  I'm experiencing brightness related issues on my MSI GT683 (Intel Core i5-2410M, nVidia GeForce GTX 560M, Ubuntu 12.04 LTS x64, nVidia driver version 295.40). To start with, when I open brightness settings, the slider is working incorrectly - screen is the dimmest on about 1/3 of a bar, moving it to the left side increases brightness. Next, while pressing the keyboard buttons (Fn+up, Fn+down), brightness changes incorrectly - sometimes 2 steps up/down, but sometimes it's totally irregular - ex. in order to set the lowest brightness, I have to set the maximum, then hit Fn+down, then Fn+up. (after 2 moves from 8 to 2... What's even more strange, while changing brightness from keyboard on boot and on login screen, it works perfect. Tried adding acpi related switches to GRUB, but the brightness settings wouldn't work at all. Any help appreciated.

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• front usb wont mount harddrives, internal usb ports do

  - by Thesgsuser

  I have noticed something in my new build, i am using Ubuntu desktop newest version my motherboard is the asus f1a75-m pro R2.0 with the usb ports in the back all my NTFS hard disks or usb sticks work fine, but then.. when i put them in the front usb ports of my chassis (silverstone milo ml-03) they wont mount... I have 2 usb 3.0 ports in front of the case connected with a internal usb 3.0 header. But i verified that the usb 3.0 ports on the back do mount the harddisk so it has nothing to do with usb 3.0 i think. The strange thing is, my mouse works fine on the front usb ports. Every usb hardware piece seems to work except if it has any memory inside it :( What seems to be the problem?

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• Chrome and Catalyst - no tab text

  - by Martin Fejes

  I just installed Ubuntu, updated, installed AMD proprietary drivers (for my Radeon HD6870) and noticed that some (most) of the tabs in Google Chrome don't have text, only the favicon. My first idea was that maybe 13.10 may have some issues with the new drivers so I switched to the normal driver instead of the beta one. It was not good. Okay then, I put back the open source drivers. It worked. Okay, it's strange. Let's install Ubuntu Gnome to see if it's Unity. No it was not. Let's install Ubuntu 13.04. Same behavoir. By this time I was desperate. I installed Fedora, the problem was there. Now I'm back to Ubuntu 13.10, but am out of ideas. Could anyone help me, please? P.s.: I can upload a screenshot, if needed.

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• Goals are not registering in Google Analytics

  - by Adjam

  I've had a site online for a few weeks, and Google Analytics is working fine. Except Goals, which are not registering for some strange reason. To be clear: visits to the site are being registered, but no goals are being registered. This is not correct, as people are visiting the goal pages. I've set up two pages specifically to test this, Funnel Page and Goal Page. (You can visit these, but please do not visit any other pages on the site, as I am performing an experiment and SO referrals would taint results). Below is a screenshot of Profiles > Goals on Analytics. Can you see any obvious mistakes I have made? I think I must have missed something really obvious, as this is my first time using Analytics, but I must get this fixed ASAP. It's driving me crazy.

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• '6' key stuck when outside the graphical interface

  - by Felipe Jacob

  A strange thing has been happening since I installed Ubuntu. Whenever I'm not on the graphical interface, that is, if I do ctrl+alt+f2, or while the system is shutting down, or when I try to reset my password accessing root on security mode, the '6' key seems to be stuck. This doesn't affect my day-to-day usage at all, but whenever I change from the graphical console, I can't do anything because it keeps pressing '666666...'. Does anyone know why that might be happening? My keyboard is a Logitech G710+, and hasn't shown any other possible compatibility issues.

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• Unable to create xcode project again from unity

  - by Engr Anum

  I am using unity 4.5.3. I already created/built xcode project from unity. However, there were some strange linking errors I was unable to solve, so I decided to delete my xcode project and rebuilt it again from unity. Unfortunately, whenever I try to build the project, just empty project folder is created. There is nothing inside it. I don't know why it is happening. Please tell me how can I create xcode project again. May be I am missing small thing. Thanks.

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• Do you think code is self documenting?

  - by Desolate Planet

  This is a question that was put to me many years ago as a gradute in a job interview and it's kind of picked at my brain now and again and I've never really found a good answer that satisfies me. The interviewer in question was looking for a black and white answer, there was no middle ground. I never got the chance to ask about the rationale behind the question, but I'm curious why that question would be put to a developer and what you would learn from a yes or no answer? From my own point of view, I can read Java, Python, Delphi etc, but if my manager comes up to me and asks me how far along in a project I am and I say "The code is 80% complete" (and before you start shooting me down, I've heard this uttered in a couple of offices by developers), how exactly is that self documenting? Apologies if this question seems strange, but I'd rather ask and get some opinions on it to gain a better understanding of why it would be put to someone in an interview.

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• When syncing, removed contacts still show upp (One contacts)

  - by Niklas

  Hi! I just tried out using the Ubuntu One Contacts app for android. First I imported all the contacts from my phone, SIM-card and Google mail account, then I spent quite a while removing duplicates which got imported. Then I tried to sync it for the first time. The strange thing is that I also got all the contacts which I removed from my contacts list on the website. So I have to set "show only contacts with phone numbers" to get all the email adresses I imported from google ealier to not show up, even though I deleted them from the contacts list and have only Ubuntu One contacts showing. Why is that? Thank you!

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• Internet Explorer 10 aborting some stylesheets

  - by Joe

  Strange problem exhibited only with IE10 on Windows 8. No other IE version, no other OS version. Some stylesheets are aborted, apparently in transport, intermittently. This seems to happen when there are three <link> tags in sequence. The tags are correctly specified and are being served from Amazon S3 over HTTPS. The first two items abort when (or prior to) loading. Altering the order of the items appears to make the first two items abort in all cases. This problem is intermittent, and different people can reproduce with differing success. I have seen a lot of conjecture about this on the web but no solution.

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• Mysterious subdomains to my site indexed by Google

  - by shouren

  Stackers, We have an issue with strange subdomains pointing to (pages on) our site such as: www2.example.com 2.example.com anothersite.com.example.com A few things are perplexing: who created them? why they do that? why Google index them and made them appear in the search results when clicking them gets a 5xx error. how can we get rid of them? It seems some type of scams that hurt our site's free search and experience. Anyone had similar experience and knows the answers? Really appreciate it!

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• Ambiguous Comparison Hint

  - by Ondrej Brejla

  Hi everybody! Today we would like to show you some new hint which will be available in NetBeans 7.3. It's called Ambiguous Comparison hint. Its name seems to be quite fuzzy, but it describes exactly what the hint does. It tries to check all comparisons whether they are intended. Because sometimes you want to make a simple assignment, but you make a typo and comparison appears. It's really dangerous mistake because then your code doesn't work as expected. Your application can produce buggy results. So here is how it looks like: But sometimes a comparison is really intended. E.g. in return statements when you want to return a boolean, so then the hint works as expected and no warning appears. That's all for today and as usual, please test it and if you find something strange, don't hesitate to file a new issue (component php, subcomponent Editor). Thanks.

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• What does intermittent "Input/output error" suggest?

  - by dan

  Lately my Ubuntu 12 system has started acting very strange. Sometimes the computer freezes and then unfreezes 2 minutes later, and other times when I try a basic command like less I get the error bash: /usr/bin/less: Input/output error. But this is intermittent too. Any suggestions? Also if I try sudo reboot and enter my password, I get sudo: unable to open /var/lib/sudo/plato/7: Read-only file system Before I used to be able to do sudo reboot fine. If I tail /var/log/syslog I do see these curious lines: .... ata1: softreset failed (device not ready) .... ata1: hard resettting link .... ata1: link is slow to respond, please be patient (ready=0) What can I do to fix this?

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