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Articles indexed Tuesday September 4 2012

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• Situations that require protecting files against tampering when stored on a users computer

  - by Joel

  I'm making a 'Pokémon Storage System' with a Client/Server model and as part of that I was thinking of storing an inventory file on the users computer which I do not wish to be edited except by my program. An alternative to this would be to instead to store the inventory file on the server and control it's editing by sending commands to the server but I was wondering if there are any situations which require files to be stored on a users computer where editing would be undesirable and if so how do you protect the files? I was thinking AES with some sort of checksum?

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• Which SSL do I need?

  - by Maik Klein

  I need to buy a ssl certificate. Now there are so many different alternatives with a huge price range. I know the very basic differences of browser compatibility and security level. But I need a "cheap" ssl certificate. My homepage looks like this http://www.test.com Now if I go to the loginpage i should switch to https like this https:/www.test.com/login I am also considering to secure the whole site if the user has singed in. Now there are sites which are offering SSl for 7$/year. Would this do the job? Or would you recommend me to get something more expensive like this one? I want to add paypal support in a later version of my website and I don't want to save money on the wrong end. What would you recommend me?

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• LGPL License in commercial application

  - by Jacob

  I have searched around but I don't seem to be able to get a clear answer on my questions that I understand. I want to use the Xuggler library in my application, which is licensed either GPL or LGPL depending on whether I compile it myself. I don't intend to edit the library If I compile it myself and thus get a LGPL version of the library, can I use it in a commercial application without having to distribute the source code of my application? Furthermore, do I have to give my application the LGPL license as well? What other problems might using this library give me?

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• How to write loosely coupled classes in node.js

  - by lortabac

  I am trying to understand how to design node.js applications, but it seems there is something I can't grasp about asynchronous programming. Let's say my application needs to access a database. In a synchronous environment I would implement a data access class with a read() method, returning an associative array. In node.js, because code is executed asynchronously, this method can't return a value, so, after execution, it will have to "do" something as a side effect. It will then contain at least 1 line of extraneous code which has nothing to do with data access. Multiply this for all methods and all classes and you will very soon have an unmanageable "code soup". What is the proper way to handle this problem? Am I approaching it the wrong way?

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• What Does It Usually Mean for a Feature to be "Supported"?

  - by joshin4colours

  I'm currently working some testing for a particular area of an application. I had to write some automated tests for a particular feature but due to the circumstances, this was not easy to do. When I asked one of the other testers about it, he mentioned that the same features exist in a sister application our company produces but isn't documented anywhere (end-user documentation or otherwise). He also said that the feature doesn't typically get tested at all in the sister application and isn't usually tested in the application I work on. Apparently this feature isn't heavily used but removing it would require a fair bit of work so the benefit-cost ratio doesn't work out. All of this has left me with some questions. Other than "The documentation says so" or "We told the client it is", what usually makes a feature "supported" versus an unsupported feature?

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• Interfaces on an abstract class

  - by insta

  My coworker and I have different opinions on the relationship between base classes and interfaces. I'm of the belief that a class should not implement an interface unless that class can be used when an implementation of the interface is required. In other words, I like to see code like this: interface IFooWorker { void Work(); } abstract class BaseWorker { ... base class behaviors ... public abstract void Work() { } protected string CleanData(string data) { ... } } class DbWorker : BaseWorker, IFooWorker { public void Work() { Repository.AddCleanData(base.CleanData(UI.GetDirtyData())); } } The DbWorker is what gets the IFooWorker interface, because it is an instantiatable implementation of the interface. It completely fulfills the contract. My coworker prefers the nearly identical: interface IFooWorker { void Work(); } abstract class BaseWorker : IFooWorker { ... base class behaviors ... public abstract void Work() { } protected string CleanData(string data) { ... } } class DbWorker : BaseWorker { public void Work() { Repository.AddCleanData(base.CleanData(UI.GetDirtyData())); } } Where the base class gets the interface, and by virtue of this all inheritors of the base class are of that interface as well. This bugs me but I can't come up with concrete reasons why, outside of "the base class cannot stand on its own as an implementation of the interface". What are the pros & cons of his method vs. mine, and why should one be used over another?

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• Visual Studio search feature does not seem to be searching for text in CSS files [migrated]

  - by aspdotnetuser

  I noticed that when using Visual Studio's 'Find in files' search feature, it does not appear to search/find text in CSS files even though the text does exist. I can't find anything on the net regarding this issue and cannot determine even if Visual Studio allows you to search for text within CSS files. Hopefully someone can shed some light on this; Is it supposed to allow you to do this? If so, what reasons would explain why this is not working?

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• Can communications & computer engineer work as a programmer? [closed]

  - by Egy Prot

  I'm studying now communications & computer engineering. The professor told me that: Engineers have much hiring priority than Computer Scientists. It's good I've the ability to apply for the faculty of engineering. This'll help me to achieve my ambition to be a programmer. We'll study computer science. While I was browsing, I only saw computer science, computer science... etc. Courses vary from a faculty to another. Can he be right? If he's right, will employers prefer Computer Scientists or Engineers?

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• Suggestions needed on an architecture for a multiple clients and customisable web application

  - by ValidfroM

  Our product is a web based course managemant system. We have 10+ clients and in future we may get more clients. (Asp.net,SQL Server) Currently if one of our customers need extra functionality or customised business logic, we will change the db schema and code to meet the needs. (we only have one branch code base and one database schema) To make the change wont affect each others route, we use a client flag, which defined in a web config file, thus those extra fields and biz logic only applied to a particular customer's system. if(ClientId = 'ABC') { //DO ABC Stuff } else { //Normal Route } One of our senior colleagues said, in this way, small company like us can save resources on supporting multiple resources. But what I feel is, this strategy makes our code and database even harder to maintain. Anyone there crossed similar situation? How do you handle that?

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• Is it OK to use sample code from blogs, GitHub, etc... in commercial applications?

  - by eterps

  When searching the web for a solution to a particular problem, I often find a perfect solution posted on someone's blog, or in a public repository (GitHub, Google Code). Most of the time, the code has no copyright information, nor does the author mention any sort of attribution rules. I'm pretty sure short snippets are fine, but what if I copy a handful of classes verbatim (again, no copyright notices, TOS, attribution requests, etc...)? Am I under any legal obligation to the original author?

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• Make command error installing Postfix

  - by Newben

  I am installing Postfix and following a tutorial, there is a command that uses 'make' but I have an error message. More precisely : make makefiles CCARGS='-DDEF_CONFIG_DIR=\"/usr/local/postfix/etc\"' and the error message : make -f Makefile.in MAKELEVEL= Makefiles (echo "# Do not edit -- this file documents how Postfix was built for your machine."; /bin/sh makedefs) makedefs.tmp ATTENTION: ATTENTION: Unknown system type: Linux 3.2.0-23-generic-pae ATTENTION: make: * [Makefiles] Error 1 make: * [makefiles] Error 2 I installed 'build-essantial' package but I still have error message. Does anyone has an idea ?

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• Requires installation of untrusted packages?

  - by Isaiah Bugarin

  I tried installing VLC Player yesterday, and I got the Requires installation of untrusted packages error. I searched for hours for a solution to this problem, and finally came upon a suggestion that said to change servers for downloading updates from. I did this, and it gave me a 404 error when I clicked on "Check" in the Update Manager. I tried switching my server back to the main one (and after that, several other ones), but I am now still getting a 404 error: And the other error I get when downloading or updating:

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• I have 2 different GEdits?

  - by aserwin

  When I load GEdit, it is different from sudo GEdit. Normal GEdit gives me Gtk warnings in the console, and ithas a different look. When I install plugins on either version, it doesn't reflect on the other. I tried removing gedit and reinstalling, but I get the exact setups (in other words, GEdit didn't actually go away when I removed it) Any advice on how I can actually remove gedit and start over? (I have tried sudo apt-get remove --purge gedit - no joy)

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• Xerox 3100 mfp printer/ scanner not working not working

  - by Nikos

  I have installed the latest version of Ubuntu on my system. My problem is I cannot find the proper drivers for my printer/ scanner:Xerox Phaser 3100 MFP. Although it is recognised by the system and my print jobs appear as completed, in fact they are not. Also I have a problem with my wireless connectio. Although it is configured in the network settings, connection is not successful, unless I restart my router. What can I do? Thank you in advance

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• how to install the freesteam which is the only opensource steam table software for ubuntu?

  - by gunjan parashar

  while installing the freesteam downoaded form the http://sourceforge.net/projects/freesteam/ which is the ony steam table software for ubuntu i am getting following error Dependency is not satisfiable: libfreesteam1. the description of package : python-freesteam , file name :python-freesteam_2.0_i386(1).deb plz help me out as it is the only available opensource steam table soft to be used by mechanical engineering student

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• keeps asking for the CD how do I force it to stop asking for the CD

  - by Ernie

  I have installed 12.04 and am attempting to update the wireless drivers (I have a Dell Insiron 6400), but it keeps asking for an installation CD that I do not have. How do I force it to stop asking for the CD and go to the network? The commands I am running are: ~$ sudo apt-get update ~$ sudo apt-get install firmware-b43-installer ~$ sudo apt-get remove bcmwl-kernel-source ~$ sudo reboot It asks for the Cd at step 2

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• install android sdk on kubuntu

  - by dot

  I'm trying to follow the instructions for installing the android sdk found here: http://developer.android.com/sdk/installing/adding-packages.html After i've unpackaged and i run the android program under tools, I don't get all the options that I'm supposed to. The only 2 folders that show up are tools, and extras. Under tools, it only shows the "Android SDK Tools" with the status "Installed". Under the "extas" folder, I have nothing. I've made sure that my http: proxy settings are correct. And I've checked the logs. there are no errors. According to the android developer site, I'm supposed to install the SDK platform tools. has anyone tried this on ubuntu? I also checked and saw others were instructed to do an apt-get install ia32-libs but it failed for me. Besides which, I am running the 32bit os... so I don't think i would need to install that... ?? I've also tried following the instructions found here: http://forums.team-nocturnal.com/showthread.php/772 But... I can't seem to add the personal archive nilarimogard without getting an error message. when i attempt: sudo add-apt-repository ppa:nilarimogard/webupd8 I get the message: Traceback (most recent call last): File "/usr/bin/add-apt-repository", line 125, in ppa_info = get_ppa_info_from_lp(user, ppa_name) File "/usr/lib/python2.7/dist-packages/softwareproperties/ppa.py", line 80, in get_ppa_info_from_lp curl.perform() pycurl.error: (7, "couldn't connect to host") root@jll:/home/me/Documents# any suggestions? Thanks.

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• polkit: disable all users except those in group wheel?

  - by John Nash

  Is it possible to do the following using 1 polkit .pkla file? Disable all users except those in the wheel group from using polkit. The users in the wheel group will need to provide the root password when using polkit. /etc/polkit-1/localauthority/50-local.d/wheel-only.pkla [disable all users except the wheel group] Identity=unix-group:wheel Action=* ResultAny=??? ResultInactive=??? ResultActive=??? The following file works but you need to provide all the users in /etc/group: [disable all users except those in the wheel group: root and myuser] Identity=unix-user:daemon;unix-user:bin;unix-user:sys;unix-user:adm;unix-user:tty;unix-user:disk;unix-user:lp;unix-user:mail;unix-user:news;unix-user:uucp;unix-user:man;unix-user:proxy;unix-user:kmem;unix-user:dialout;unix-user:fax;unix-user:voice;unix-user:cdrom;unix-user:floppy;unix-user:tape;unix-user:sudo;unix-user:audio;unix-user:dip;unix-user:www-data;unix-user:backup;unix-user:operator;unix-user:list;unix-user:irc;unix-user:src;unix-user:gnats;unix-user:shadow;unix-user:utmp;unix-user:video;unix-user:sasl;unix-user:plugdev;unix-user:staff;unix-user:games;unix-user:users;unix-user:nogroup;unix-user:libuuid;unix-user:crontab;unix-user:messagebus;unix-user:Debian-exim;unix-user:mlocate;unix-user:avahi;unix-user:netdev;unix-user:bluetooth;unix-user:lpadmin;unix-user:ssl-cert;unix-user:fuse;unix-user:utempter;unix-user:Debian-gdm;unix-user:scanner;unix-user:saned;unix-user:i2c;unix-user:haldaemon;unix-user:powerdev Action=* ResultAny=no ResultInactive=no ResultActive=no

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• Is it possible to run two VPN clients at the same time?

  - by Manuel Selva

  I would like to run two VPN clients at the same time: one Cisco client and one VPNC client. For now I have my VPNC client configured to route only some known IPs to the VNC interface and would like to add the same thing for the Cisco client at the same time. Is it possible ? Do I need a Cisco client to connect to a Cisco server or can I use an other client such as VPNc ? I installed the cisco one because it was the one suggested but I am wondering if this is mandatory ? I guess the answer may be yes, and off course I am interested in "required configurations" to do that

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• How to access shared folders from file editors?

  - by Marchosius

  I am running a xampp server on one of my other computers, and when using the brows functionality from text editors like gedit, bluefish and Eclipse/Aptana studio I can access the shares I made for the sites running on the server. Even when I right click-edit with-application with the the file browser it does not open the file in the editor. How can get this to work without having to copy the file over from the share then edit and then upload again after I am done? Similar issue when trying to upload a file to hosting server direct from the file server I have with filezilla. with this I also need to copy the file over to my pc and then from there upload to the hosting server with filezilla. EDIT: For eclipse I found a build in functionality to do this. (new-remote system connection-Enter the access details) Nothing yet on FileZilla Hope my Question is clear

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• Different behavior when launched from terminal instead of Unity launcher

  - by dgkontopoulos

  I have written two Perl/Gtk programs. When launched from the dash menu, they run just fine. However, if I try to launch them from terminal using the very same command found in their .desktop files, their Unity launcher will be blurry and will remain inactive when clicked, if I keep it in the Unity bar. The problem is solved if the Exec part of the desktop file is replaced with perl path_to_script However, that leads to other problems, including a lintian warning and forcing all Perl GUI applications running from terminal to adopt the same launcher. This issue is quite annoying since one of the programs relies on a different (Python) program in order to be launched and this results in having a blurry and inactive launcher.

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• How do I get Chromium to show PDFs using Evince?

  - by potofcoffee

  Is there any way to get Chromium to use a mozpluggerrc/evince combination to show PDFs embedded into its own window? Right now, Chromium is just downloading PDFs. I can open them in an external evince window by clicking on the downloaded file. I am using Chrome 18.0.1025.168 under Ubuntu 12.04 (amd64). Here's the pdf section of my /etc/mozpluggerrc.d/62-documents.conf: application/pdf:pdf:PDF file application/x-pdf:pdf:PDF file text/pdf:pdf:PDF file text/x-pdf:pdf:PDF file repeat noisy swallow(evince) fill needs_xembed: evince "$file" mozpluggerrc does show up in about:plugins. BTW, this works just fine in Firefox. Note: I am not looking for hints on how to use Google Chrome's PDF plugin in Chromium.

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• ssh -X "Xt error: Can't open display: :0.0"

  - by Fabian

  I'm trying to open xterm on my remote server (Ubuntu Server 10.04) with ssh: ssh -X name@machine xterm but the error returned is: xterm Xt error: Can't open display: :0.0` I googled and tried everything I found. Still getting this error. The DISPLAY-variable should be set automatically, right? Part of sshd_config: X11Forwarding yes X11DisplayOffset 10 PrintMotd no PrintLastLog yes TCPKeepAlive yes Any advice?

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• facebook internal search by google [migrated]

  - by Alexis

  I am currently working on a challenge; basically using google api; I would search for facebook fan pages; most specifically the "about" timeline for the email add and the date the business was founded. So far I have come to this: site:facebook.com/pages + "business type" + "country" + "@email.com" I need to add something else so that it can give me back the date it was founded in. If you see the facebook fan page in the about section; there is for e.g (Founded 06/02/2010) The bracketed info above is what I need to add to succeed in adding; any idea?

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• best way to host multiple wordpress site on single vps [migrated]

  - by Ben

  Not sure if this is webmaster or a WordPress question, it's a bit half and half, sorry if I'm posting in the wrong place. Without using Multi-Site or installing new WordPress CMS' in second-level domains, what's the best way to get multiple WordPress installs running on my VPS (running Linux powered CentOS 6 with WHM and cPanel)? It's currently working but only by setting the permalinks option to the default setting, so the URLs aren't human-friendly. I have come across something called WPSiteStack, though I'd really rather not go down this route. Long story short, I need the following: Seperate installs so one core / theme / plugin update doesn't affect all sites and increases security of all sites; 'Pretty' permalinks; Each WordPress install must be in the root of it's own domain to ensure that I can accurately measure my clients' quotas; It may also be worth noting that some functions within each install use the $_SERVER['DOCUMENT_ROOT'] and $_SERVER['HOST'] variables. I have already edited the httpd-vhosts.conf, httpd.conf and .htaccess files but this hasn't made any changes. So any ideas what I'm missing or doing wrong? Any help is much appreciated.

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