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• Where can I safely learn about computer security?

  - by Ammar Ahmed

  I find it really hard to find resources about computer security. I asked questions on message boards about key loggers and viruses and I got negative assumption from people assuming the the worse. Also, I don't think that I can trust random message boards. I know that it is a broad topic, but are there any good websites that I can follow and learn from that are targeted to beginner with some samples? I am a developer (or at least want to be one) and I have a CS degree if that helps.

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• Store a formula in a table and use the formula in a javascript/PHP function

  - by Muhaimin Abdul

  I have a MySql database where part of it handles instrument's depth of water. Each instrument has its own formula of calculation how depth the water when the operator collect the reading I stored the formula for each instrument in database/MySql. Example formula: [55-57] this is the simple minus operation, where the number is actually represent the id of a row. How do I represent those number with id of a row and later convert it to javascript readable code. I simply want to do keyup event where everytime user key in something into text field then the other part of HTML would reflect changes based on formula that I fetched from database FYI, I'm using BackboneJS together with RequireJS

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• Closest location - Heapify or Build-heap

  - by Trevor Adams

  So lets say we have a set of gps data points and your current location. If asked to give the closest point to your current location we can utilize a heap with the distance being the key. Now if we update the current location, I suspect that only a few of the keys will change enough to violate the heap property. Would it be more efficient to rebuild the heap after recalculating the keys or to run heapify (assuming that only a few of the keys have changed enough). It is assumed that we don't jump around with the new location (new current location is close to the last current location).

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• Best way to go about sorting 2D sprites in a "RPG Maker" styled RPG

  - by Aaron Stewart

  I am trying to come up with the best way to create overlapping sprites without having any issues. I was thinking of having a SortedDictionary and setting the Entity's key to it's Y position relative to the max bound of the simulation, aka the Z value. I'd update the "Z" value in the update method each frame, if the entity's position has changed at all. For those who don't know what I mean, I want characters who are standing closer in front of another character to be drawn on top, and if they are behind the character, they are drawn behind. I'm leery of using SpriteBatch back to front or front to back, I've been doing some searching and have been under the impression they are a bad idea. and want to know exactly how other people are dealing with their depth sorting. Just ultimately trying to come up with the best method of sorting for good practice before I get too far in to refactor the system effectively.

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• Removing a File Association

  - by Anthony Trudeau

  I found a rather simple way to remove a file association (default program) tonight that I thought others might find useful.  I found it after discovering that Windows 7 doesn't provide a straight-forward way of removing an association.Windows 7 provides a nice interface in the Control Panel for changing associations (Programs > Default Programs > Set Associations), but once you have one you cannot get rid of it.  The Registry is an obvious choice, because that's where the associations are stored.  In fact, the HKEY_CLASSES_ROOT hive has the association, but there is also a key you need to delete somewhere in the HKEY_CURRENT_USER hive.Doing a little poking around, I discovered a command line program called ASSOC that'll do it.  And typing HELP ASSOC confirms that it was what I was looking for.  The solution to my problem turned out to be as simple as typing ASSOC .BIN="" on the command line.

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• Ubuntu Slows down over time?

  - by Lucas McCoy

  About a few months ago I was using Ubuntu (doing something in the command line) when it started lagging really bad. I would hit S (or any other key) and like 20 seconds later it would show up in my terminal. Naturally I killed the machine and rebooted. The system started working just fine, but about 30 minutes later it did the same thing. Now I'm forced to use Ubuntu in 30 minute spurts. I've looked at my running processes and none of them are taking large amounts of CPU or RAM. Luckily I've dual-booted so I could still use my machine. Now I need to get this fixed and I'm wondering what my options are. Will I be forced to do a fresh install or is there another way?

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• How to bind mouse buttons to keys?

  - by Callum Rogers

  I have a Logitech MX400 Laser Mouse which has 5 buttons + 4 for vertical/horizontal scrolling. I would like it set up so instead of horizontal scrolling pressing right on the scrollwheel will send Ctrl+Tab and left will send Ctrl+Shift+Tab, which will allow me to cycle through tabs in browsers. Also, it would be nice if I could remap the middle button to one of the ones on the side as it is really hard to press down. Another bonus would be if I could write a script that allows me to define what buttons do what dependent on which window is currently active. I have tried using xmodmap but I could only see how to rearrange buttons, not have them send key signals. Thanks in advance. Button Map (using xev): Left 1 Middle 2 Right 3 ScrollUp 4 ScrollDown 5 ScrollLeft 6 ScrollRight 7 Backward 8 Forward 9

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• Accept keyboard input when game is not in focus?

  - by Corey Ogburn

  I want to be able to control the game via keyboard while the game does not have focus... How can I do this in XNA? EDIT: I bought a tablet. I want to write a separate app to overly the screen with controls that will send keyboard input to the game. Although, it's not sending the input DIRECT to the game, it's using the method discussed in this SO question: http://stackoverflow.com/questions/6446085/emulate-held-down-key-on-keyboard To my understanding, my test app is working the way it should be but the game is not responding to this input. I originally thought that Keyboard.GetState() would get the state regardless that the game is not in focus, but that doesn't appear to be the case.

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• Ubuntu boots to totally blank after I installed some graphic card updates

  - by baboonWorksFine

  I am using Ubuntu 10.04 LTS, dual boot with win7 on ThinkPad T400, I followed Ubuntu update hints and installed some update for my ATI Radeon graphic card, but when I boot to Ubuntu(means I can still load GRUB), the tragedy happened, the screen goes to blank and no matter what key stroke, I can not get any responds, I try to go to text terminal, but impossible! However when I hit the power button, the computer would pop out the Ubuntu shutdown screen briefly and shut down. I figure out I should delete the updates package of my graphic card, but I don't even get a chance to go to text terminal, please help me!

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• Connection timeout when trying to SSH

  - by dan

  The other day I tried to connect to my remote server via SSH as i always have. But now when I try to connect it just times out after about 60 seconds. I run service ssh start Which tells me that Job is already running: ssh. I then ran $netstat -tnlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 2030/mysqld tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 1972/dovecot tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN 2157/perl tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 3028/sshd tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 2273/master tcp6 0 0 :::80 :::* LISTEN 2618/apache2 tcp6 0 0 :::21 :::* LISTEN 2291/proftpd: (acce tcp6 0 0 :::22 :::* LISTEN 3028/sshd I am able to access subdomains on my site, and FTP, but don't have the ability to SSH or even ping remotely. Any thoughts?

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• Silverlight TV 18: WCF RIA Services Validation

  Just prior to MIX10, Nikhil Kothari appears on the show to demonstrate some of the key advantages around validation when using WCF RIA Services. He demonstrates how to use a Domain Service to expose your domain model and how to create a custom service method to further filter your data server side. Nikhil also shows how the Domain Services generates validation rules using the database attributes such as required fields or maximum string lengths. Other topics Nikhil covers: Domain service generated...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Objective C and ios development training courses feedback

  - by Mutuelinvestor

  I'm thinking about taking an Objective C / iphone/ipad development training course. Pragmatic Studio and Big Nerd Ranch appear to be the key players. I'd love to hear any feed back from anyone who has completed training with Pragmatic, Big Nerd or others. I'd interested in quality of instruction, how much you learned, strengths, weaknesses and any other valuable insights. Its a pretty big financial commitment for me and I want to get the most bang for my buck. Thanks in advance for your input.

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• How to tell thunar to stop using my device?

  - by Guillaume Coté

  When I do sudo umount /media/KINGSTON I got umount: /media/KINGSTON: device is busy. By using fuser -c /media/KINGSTON And cat /proc/<pid>/cmdline I found that the process is thunar--deamon. I closed all file manager windows. When I try to umount it by right cliking on the desktop, it also gave an error : An application is preventing the volume "KINGSTON" from being unmounted I am affraid that killing Thunar is going to impact other process running in other terminal. How can I tell it that I don't need this usb key anymore so it stop using it?

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• Juju bootstrap, install

  - by Robert G.

  I would like to test MAAS + JUJU + OpenStack (I followed the documentation on maas.ubuntu.org) I already made a test environment: 1 MAAS server wich will also run JuJu 10 KVM servers for Openstack The KVM servers are already in "ready" state in MAAS. I would like to set up JuJu but i could not which is drives me crazy. My environments.yaml: environments: maassrv: type: maas maas-server: 'http://${192.168.1.116}/MAAS/' maas-oauth: 'my-key-from-maas' authorized-keys-path: /root/.ssh/id_rsa.pub admin-secret: 1234 default-series: trusty When I run "juju status -e maassrv` : ERROR Unable to connect to environment "maassrv". Please check your credentials or use 'juju bootstrap' to create a new environment. Error details: environment "maassrv" not found OK, it's right, so i should run juju bootstrap -e maassrv: ERROR environment "maassrv" not found When i run the command without the -e switch: error: no environment specified So, I am stuck here, I already added the required ssh keys to maas too. I ran out of ideas why it isn't working.

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• Experiencing the New Social Enterprise

  - by kellsey.ruppel(at)oracle.com

  Social media and networking tools, popularly known as Web 2.0 technologies, are rapidly transforming user expectations of enterprise systems. Many organizations are investing in these new tools to cultivate a modern user experience in an "Enterprise 2.0" environment that unlocks the full potential of traditional IT systems and fosters collaboration in key business processes. Is your organization a social enterprise? How are you using Web 2.0 and Enterprise 2.0 technologies? Read this white paper to learn how Oracle WebCenter Suite enables organizations to become social enterprises and is the modern user experience platform for the enterprise and the Web.

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• Extra buttons on Razer Anansi on Ubuntu 13.04

  - by jjpe

  I own a Razer Anansi keyboard and recently installed 13.04 after running 12.04 for over a year. On 12.04 I used xmodmap to map the thumb and macro keys to do useful stuff for me. This solution is based on keycodes which are triggered when a key is recognized. The problem is that on 13.04 this does not work for all keys anymore. The thumb keys T2, T3 and T4 (i.e. the middle 3 ones on the top of the 2 rows) in particular don't generate keycodes anymore while the rest still does. Now this is not completely surprising: pressing the affected keys in Unity generates notifications for what looks like Unity touchpad notifications. How can I shut that touchpad-subsystem up once and for all and give my keyboard keys back to my keyboard? Ideally I'd like to be able to use my .Xmodmap file again in 13.04 (and beyond) as that seems to me the most simple solution, but working alternatives are also welcome.

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• How can one unlock a fully encrypted Ubuntu 11.10 system over SSH at boot?

  - by Jeff

  In previous versions of Ubuntu, and current versions of Debian, you can unlock a fully encrypted system (using dmcrypt and LUKS) at boot time over SSH. It was as easy as: Installing the encrypted system using the Ubuntu alternate installer disk or normal Debian installer disk and choosing to encrypt the system. After the system is installed, adding the dropbear and busybox packages. Updating the initram-fs to authorize your ssh key. At boot time, you'd just ssh to the machine, and do: echo -ne "keyphrase" > /lib/cryptsetup/passfifo The machine would then unlock and boot the encrypted system. Using the exact same steps on Ubuntu 11.10, I can ssh to the machine, but /lib/cryptsetup/passfifo doesn't exist. There appears to be no way to unlock the system over ssh. I'm not sure where to look to see if this functionality changed or if it was removed.

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• Just updated, after reboot my computer won't start up again

  - by Alex

  I have a macbook that I use on occasion which dual boots Ubuntu and OSX (It has rEFIt installed). I turned it on for the first time in a while and it needed a bunch of updates. So I let it run, and restarted it when it asked. When it was booting up, it got stuck at a light blue screen. There was nothing on the screen to indicate that it was doing anything - I figured it just got stuck or something, so I turned it off and back on. (I suspect now it was actually working, but I had no indication that it hadn't just frozen) Now I can't access either OSX or my Ubuntu partition. When I choose ubuntu on the rEFIt menu, it shows "No bootable device -- insert book disk and press key". If I try to start up OSX is looks like it starts loading, but instead of an apple logo there's a crossed out circle icon.

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• Ubuntu 12.04 - Workspace switcher is shown after switching to another workspace

  - by David Kuridža

  I've just upgraded to Ubuntu 12.04 on HP Envy 14 and found a rather interesting bug. When I switch between workspaces using keyboard shortcuts, for example moving down to Workspace 3 from Workspace 1, workspace switcher is shown (as seen on below screenshot). It stays there until I hit escape key. After debugging, the problem only happens when I change shortcut keys to Super + direction. With default Ctrl + Alt + direction, everything is OK. I've searched but haven't found this problem reported before, I'm also not sure this is called workspace switcher :) Can you please let me know what to search for, are there any logs which might have some related information?

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• DansGuardian/Squid Traffic doesn't get back to user

  - by DKNUCKLES

  I've purchased a Squid appliance that I'm attempting to implement, however the lack of documentation has left me a bit high and dry. Forgive me if this is a silly question, but this is my first attempt at implementing Squid. From what I can ascertain from the documentation (or lack thereof), the users connect to DansGuardian first at port 8080 where the filtering is done, at which point it forwards it to the Squid appliance at port 3128. The traffic is then sent to the internet. The setup I have is as follows Gateway (MikroTik router) : 192.168.88.1 Squid/DansGuardian :192.168.88.100 Client : 192.168.88.238 Client --- Gateway --- Proxy --- Internet I have set up a simple NAT rule to forward all traffic from the client machine (for testing purposes) to go to the DansGuardian. The traffic seems to get there, although I see a lot of SYN_RECV w/ a netstat -antp command on the virtual appliance machine. From this I gather that the traffic is NOT being routed back to the client machine. Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN - tcp 0 0 192.168.88.100:8080 192.168.88.238:55786 SYN_RECV - tcp 0 0 192.168.88.100:8080 192.168.88.238:55787 SYN_RECV - tcp 0 0 192.168.88.100:8080 192.168.88.238:55785 SYN_RECV - tcp 0 0 192.168.88.100:8080 192.168.88.238:55788 SYN_RECV - tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN - Is this a routing issue or an issue with the Squid Appliance?

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• Ubuntu on AMD based Sony Vaio VPCY B15AG

  - by Gaurav

  Last week I bought a AMD E350 (AMD Fusion platform) based Sony VAIO (VPCYB15AG) having AMD Radeon HD 6310 graphics, I removed Windows that came along with and installed Ubuntu 10.10 (AMD64) using USB drive. During installation my touchpad was not working, I managed through keyboard, but after completing installation & restarting the machine still there was no touchpad support. Also there's no proper graphic card drivers. Even I tried connecting the USB mouse to it but the left key is not working and had to configure the mouse as left-hand to get the left click enabled. I tried searching for any possible solutions for these but found nothing helpful, is there any hope? What should I do to enable i) enable touch pad support ii) get higher resolution 1366x768, etc?

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• MSDN Magazine May Issue is Live

  Editor's Note: This Way-Cool 'Internet' Doohickey It wasn't all that long ago that surfing meant grabbing a board and hanging 10. Keith Ward Silverlight Security: Securing Your Silverlight Applications Josh Twist explains the unique challenges developers face in securing Silverlight applications. He shows where to focus your efforts, concentrating on the key aspects of authentication and authorization. Josh Twist Now Playing: Building Custom Players with the Silverlight Media Framework...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Why are PHP function signatures so inconsistent?

  - by Shamim Hafiz

  I was going through some PHP functions and I could not help notice the following: <?php function foo(&$var) { } foo($a); // $a is "created" and assigned to null $b = array(); foo($b['b']); var_dump(array_key_exists('b', $b)); // bool(true) $c = new StdClass; foo($c->d); var_dump(property_exists($c, 'd')); // bool(true) ?> Notice the array_key_exists() and property_exists() function. In the first one, the property name(key for an array) is the first parameter while in the second one it is the second parameter. By intuition, one would expect them to have similar signature. This can lead to confusion and the development time may be wasted by making corrections of this type. Shouldn't PHP, or any language for that matter, consider making the signatures of related functions consistent?

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• sqlite3 timestamp (current_timestamp) one hour off

  - by Eiriks

  I run a small crawler on a virtual ubuntu server, initiated by crontab hourly. Datetime is inserted by defaulting the date filed to TIMESTAMP DEFAULT CURRENT_TIMESTAMP. Table creation looks like this: CREATE TABLE links (page TEXT, link TEXT, date TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY(page,link)); The datetime gets stored fine, but it one hour off (one hour behind) Norwegian time (GMT +1). The server is located where-ever, I just need it to be on GMT+1. By typing datein the ssh session I get: Wed Dec 19 17:26:02 CET 2012 and that is correct (just now). So where does sqlite3 get it's time from? What must I do to set the time so that sqlite3 gets the time right?

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• Join us! Oracle Manufacturing Industries Forum, Chicago Thurs. Nov.14'13

  - by Stephen Slade

  The 6th Annual Oracle Manufacturing Industries Forum will take place in Chicago, Thurs, Nov.14 '13. Executives from successful global manufacturing companies will address key themes including: Value Chain Transformation, Owning the Customer Service Experience, Sales and Operations Planning in a Global Enterprise Supply Chain, and Modernizing the Manufacturing Enterprise. Join us for what we expect to be one of the industry's most informative and provocative executive events of the year. Event Objectives: Create an environment where executives can interact with their peers to discuss current issues Brainstorm and discuss how attendees can use technology to transform their organizations Share best practices and learn through the experiences of industry peers Where: Westin Chicago River North,  320 North Dearborn St,  Chicago, IL 60654 Evite: http://www.oracle.com/us/dm/229048-nafm13049989mpp074-se-2021171.html Register:   http://eventreg.oracle.com/profile/web/index.cfm?PKWebId=0x25005591a&source=evite Partner Sponsors Include: CSS, Fujitsu, Inspirage, Hitachi Consulting, Lucidity and Rolta Register Now!

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