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• Is this safe? <a href=http://javascript:...>

  - by KajMagnus

  I wonder if href and src attributes on <a> and <img> tags are always safe w.r.t. XSS attacks, if they start with http:// or https://. For example, is it possible to append javascript: ... to the href and src attribute in some manner, to execute code? Disregarding whether or not the destination page is e.g. a pishing site, or the <img src=...> triggers a terribly troublesome HTTP GET request. Background: I'm processing text with markdown, and then I sanitize the resulting HTML (using Google Caja's JsHtmlSanitizer). Some sample code in Google Caja assumes all hrefs and srcs that start with http:// or https:// are safe -- I wonder if it's safe to use that sample code. Kind regards, Kaj-Magnus

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• Number Game Algorithm

  - by 7Aces

  Problem Link - http://www.iarcs.org.in/inoi/2011/zco2011/zco2011-1b.php The task is to find the maximum score you can get in the game. Such problems, based on games, where you have to simulate, predict the result, or obtain the maximum possible score always seem to puzzle me. I can do it with recursion by considering two cases - first number picked or last number picked, each of which again branches into two states similarly, and so on... which finally can yield the max possible result. But it's a very time-inefficient approach, since time increases exponentially, due to the large test cases. What is the most pragmatic approach to the problem, and to such problems in general?

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• Techniques for Working Without a Debugger [closed]

  - by ashes999

  Possible Duplicate: How to effectively do manual debugging? Programming in a debugger is ideal. When I say a debugger, I mean something that will allow you to: Pause execution in the middle of some code (like a VM) Inspect variable values Optionally set variable values and call methods Unfortunately, we're not always blessed to work in environments that have debuggers. This can be for reasons such as: Debugger is too too too slow (Flash circa Flash 8) Interpreted language (Ruby, PHP) Scripting language (eg. inside RPG Maker XP) My question is, what is an effective way to debug without a debugger? The old method of "interleave code with print statements" is time-consuming and not sufficient.

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• Why doesn't cron complete my script?

  - by brickinthewall

  I have a backup script (rsync via ssh) which is run by cron (configured in /etc/crontab) 0 2 * * * root /bin/bash --login /opt/aebackup/sshbackup.sh If I run it as logged in root like following it runs prefectly fine. root@server:~# /opt/aebackup/sshbackup.sh If I run it via cron it would just stop after a while (not always on the same task in the script.. it seems pretty random, like the process is killed at some point randomly) Does anyone have an idea why my cron would do that? thanks for anything... I'm desperate!

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• How to Turn a Match into a Miniature Rocket [Video]

  - by Jason Fitzpatrick

  If you’re looking for a novel little stunt to impress your friends this Fourth of July, these tiny matchstick rockets are a cheap and easy trick to pull out of your sleeve. Courtesy of Grathio Labs, all you’ll need is a book of matches, a pin, a paper clip, and some aluminum foil. Watch the video to see how it all comes together: As always, play safely with the fun-but-potentially-dangerous projects we share. [via Make] How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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• Getting "System program problem detected" pops up regularly after dist-upgrade

  - by grrrbytes

  This started to happen immediately after I had rebooted the first time after doing a system upgrade to 12.04 from 11.10. It first starts with a dialogue that says "System program problem detected". Then when I try to hit 'report problem' not much happens. I am led through a dialogue that always ends up the problem cannot be solved. I am running a MacBook1,1 I am aware this is not a lot of information, however I'm not sure which information I need to publish and how should I obtain it to debug this problem. Here's a screenshot!

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• Handling player/background movements in 2D games

  - by lukeluke

  Suppose you have your animated character controlled by the player and a 2D world (like the old 2D side-scrolling games). When the user press right on the keyboard, the background is moved to the right. If the path is always horizontal, this is simple to do (incrementation/decrementation of the x-coordinate). But suppose that the path is instead a polygonal chain. My questions are: How do you move the background? How do you move the background if the game objects are managed with a physics engine like box2D?

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• South African MVPs deserve their title.

  - by MarkPearl

  Recently I read a post by someone who felt the Microsoft MVP program had failed. My local experience with the MVP program would tend for me to disagree. On Saturday I attended a free Windows Phone 7 event organized by Robert MacLean and Rudi Grobler both of whom are local MVP’s. First of all, kudos to them for organizing the event which included a free lunch and flash stick and had some great content for a free event. Secondly, this is not the first time that either of these two MVP’s have organized events. They are active in the community, present at the majority of local events and are always approachable and give an “honest” opinion. For me, that is what an MVP stands for and at least in my region I feel that the MVP program is a real success.

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• What is a *slightly* less extreme equivalent to being "fluent" in a language?

  - by Mehrdad

  tl;dr: What is a less extreme (but still noticeable) alternative to the word "fluent", when saying e.g. "I am fluent in C++/Python/whatever?" I think I can call myself "fluent" in C#, because I know the language and runtime very well, and I'm very familiar with the .NET framework's APIs and classes, etc. I would like to claim the same thing for Python and C++. But while I can program in Python (I did so for an entire summer, making a website with Django), for example, I would not call myself fluent because my code isn't always "Pythonic" (e.g. using map/filter vs. list comprehensions), and I'm not too intimate with some aspects of the language and standard library yet (e.g. the introspection API, etc.). Is there a word or phrase I can use on e.g. a resume to describe what I know? I can think of "very familiar with", but is there a better word/phrase I can use?

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• Objects disappear when zoomed out in Unity

  - by Starkers

  Ignore the palm trees here. I have some oak-like trees when I'm zoomed in: They disappear when I zoom out: Is this normal? Is this something to do with draw distance? How can I change this so my trees don't disappear? The reason I ask is because my installation had a weird terrain glitch. If this isn't normal I'm going to reinstall right away because I'm always thinking 'is that a feature? Or a glitch'?

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• GA tracking utm query params after hashbang

  - by hybrid9

  We currently use a hashbang for the portion of our site that generates dynamic content which can also be deep linked. Our analytics team wants to use utm params to track the referral traffic from social networks. We are using Universal Analytics (analytics.js) as well as GTM. Will GA pick up the query parameters after the hashbang or does it always have to go before? For example: example.com/#!/some/content?utm_source=foo&utm_campaign=bar example.com?utm_source=foo&utm_campaign=bar/#!/some/content In #1, I'm concerned that the utm params won't be recorded and in #2 the page will break or the url could be incorrectly written. How does GA pull in those parameters - location.search? regex? Can I get away with using either?

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• What are good gui guidelines for standard actions (usability)

  - by Michael Durrant

  For example: Delete's should have confirms. Confirmations should be green. Prefer list-of-values over free text whenever possible. This was just a sample. I am looking for references that simply and clearly list common 'should do's' in terms of ui, interactions and usability. My company is new to software development and they keep getting suprised by contractors that don't do the obvious so I am looking for good references about the right way to do it and the basic things to always consider (like the above). Obviously style is subjects, but things like delete confirms shouldn't be.

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• How to create reproducible probability in map generation?

  - by nickbadal

  So for my game, I'm using perlin noise to generate regions of my map (water/land, forest/grass) but I'd also like to create some probability based generation too. For instance: if(nextInt(10) > 2 && tile.adjacentTo(Type.WATER)) tile.setType(Type.SAND); This works fine, and is even reproduceable (based on a common seed) if the nextInt() calls are always in the same order. The issue is that in my game, the world is generated on demand, based on the player's location. This means, that if I explore the map differently, and the chunks of the map are generated in a different order, the randomness is no longer consistent. How can I get this sort of randomness to be consistent, independent of call order? Thanks in advance :)

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• Why to let / not let developers test their own work

  - by pyvi

  I want to gather some arguments as to why letting a developer testing his/her own work as the last step before the product goes into production is a bad idea, because unfortunately, my place of work sometimes does this (the last time this came up, the argument boiled down to most people being too busy with other things and not having the time to get another person familiar with that part of the program - it's very specialised software). There are test plans in this case (though not always), but I am very much in favor of making a person who didn't make the changes that are tested actually doing the final testing. So I am asking if you could provide me with a good and solid list of arguments I can bring up the next time this is discussed. Or to provide counter-arguments, in case you think this is perfectly fine especially when there are formal test cases to test.

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• Is excessive indirection and/or redundant encapsulation a recognized concept?

  - by Omega

  I'm curious if there's a series of tendencies or anti-patterns when programming whereby a developer will always locally re-wrap external dependencies when consuming them. A slightly less vague example might be say when consuming an implementation of an interface or abstract, and mapping every touch-point locally before interacting with them. Like an overcomplicated take on composition. Given my example, would the interface not be reliable enough and any change to it never be surmountable any any level of indirection? Is this a good or a bad practice? Can it ever go too far? Does it have a proper name?

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• Is content slowing down your business?

  - by Lance Shaw

  We are living in a digital world, however paper is everywhere and expensive, right? We all agree content is an important part of our organization and contribute to its decision making. However many of us see dealing with this as a challenge and the growth of content is impacting our ability to scale and respond quickly to our customers. Business always has been content intensive. For JD Edwards customers, this is an important consideration.  After all, the processes being run in JD Edwards are usually very critical to the success of your business and if they are not running as smoothly as they should due to manual process steps involving paper or searching for content, you should look into improving them.  To that end, we hope you will join this webinar and learn how Oracle and KPIT | SYSTIME have partnered to help a JD Edwards customer content-enable its enterprise with Oracle WebCenter Content and Oracle WebCenter Imaging 11g and integrate them back with JD Edwards to significantly improve processing speed and operational costs.

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• How to I teach my artist to do arts for games?

  - by Holm76

  So my girlfriend is an artist and I'm a programmer and we often talk about joining talents and doing some small games or other fun stuff for the different popular platforms currently out. But because I haven't really done any serious games development yet I have a hard time explaining to her how she should create or package the assets she'd make so we always end up not doing nothing about it. What I'm mostly thinking about here is when doing frame by frame animation. I know sprite sheets are used for this kind of thing but then comes questions like frames per second and stuff like like that. Not program wise but art wise. Is there a reference site or sites out there that teach someone with the skills of art how to manage and arrange the assets in sprite sheets and other stuff in words that artists understand?

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• What percent of visitors should click on the next page before you enable prefetching?

  - by Kevin Burke

  Mozilla Firefox and Google Chrome support prefetching via an HTML tag: <!-- in chrome --> <link rel="prerender" href="http://example.org/index.html"> I suppose it is always worthwhile to include this tag if 100% of users on a page click on the "Next Page" button or similar, and never worthwhile to include it if only 2% or 3% of users visit the following page. At what percent of clicks should you turn on prefetching of the next page? 65%? Also, does the calculus change if the current page is HTTP and the next page is HTTPS?

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• What are the most effective learning methods?

  - by BuckWoody

  After I got done speaking at the SQL Server 2008 R2 Launch Event yesterday I came back to the hotel room for a web-meeting with some of the other teachers at the University of Washington. As teachers we are always looking to improve the knowledge transfer to our students – and the Program Director found an interesting study that I thought I might share here. Below is an un-labeled chart showing the effectiveness of learning methods according to a recent study. At the top are the labels. (“Teaching” here means students teaching each other). Try the experiment we did: place the labels where you think they’ll go. I’ll post the completed chart tomorrow. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• Rotate object Up/Down/Left/Right in any orientation

  - by George Duckett

  I'm rendering model at the origin with a fixed camera looking at it positioned on the z axis. I want to be able to rotate the model up/down and left/right. Currently I have 2 variables, HorizontalRotation and VerticalRotation. When calculating the world matrix I rotate about the Y axis by HorizontalRotation and about the X axis by VerticalRotation. The ..Rotation variables are controlled by pressing up/down/left/right arrow keys. The problem I'm having is that the rotations are happening relative to the object. Lets say it's a model of the world. Pressing Up a bit would let me look at the north pole. Currently when i press right the earth spins infront of the camera on its axis; I'm still looking at the north pole. How can i get it so that no matter what rotations are currently applied i can always rotate my model relative to the camera/world axis?

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• Why is this happening with the wine menu?

  - by Patrick

  Some of the items in the Wine menu are given a prefix that is their entire path. The items that don't have the long prefix seem to work fine, but those that do, don't respond to the Properties button or double-click in the menu editor. They take a lot of space, and look ugly, but I can't rename them. I've tried editing their associated files, there doesn't appear to be anything different about them to the ones that are working fine. They weren't always like that - it just happened after an upgrade one day and it's been like that ever since.

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• AMD control center doesn't save preferences

  - by Fault

  Everytime when I edit the monitor preferences in AMD to multi-monitor or to a multidesktop, when I press save or apply the program just closes with no errors and the preferences hasn't been saved. If I try to do it via the Displays app that is built-in in ubuntu 11.10 I get the following error: The selected configuration for displays could not be applied required virtual size does not fit available size: requested=(2560, 1024), minimum=(320, 200), maximum=(1280, 1280) I don't know if it helps but my graphics card is a ATI Radeon HD 4800 and my monitors are both 1280x1024. I'm running the proprietary driver without post-release updates because I always get an error trying to install that one.

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• How can I fix intermittent iSight camera functionality on a Macbook Pro 5,2?

  - by Mmmm

  I have a Macbook Pro 5,2 laptop dual booting OSX and Ubuntu. The built-in iSight video camera works only sporadically. By that I mean that sometimes if I boot and try to use the camera it does not work (most of the time) but other times it does. I don't have good repeatable data regarding when it does vs. when it doesn't other than to say that it always seems to work right after I upgrade to a new Linux kernel with the Update Manager and reboot, but then eventually stops working again until I upgrade the kernel again. That is hard to test repeatably, so it's hard to know for sure that that is the case. This has happened consistently with every version of Ubuntu from 10.10 through 11.10. I can get around this by booting into the OS/X partition, since all of the hardware obviously works perfectly on that side of things, but it would be great if I could remain in Ubuntu and do the same thing. Thanks in advance for any inSights.

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• How to grub-install ignore specific drive/partition

  - by gsedej

  Is it possible to use grub-install or update-grub to just search on specific disk/partition? (or ignore specific)? I installed Ubuntu 12.04 on my hard drive, but i wished to do some testing on it without harming current installation, so I "rsynced" root partition (the only) to the USB partition (ext4). I did fix /etc/fstab on USB partition. The problem is that when I do grub-install /dev/sdb (usb) GRUB seems to confuse when UUIDs. Whatever I chose in GRUB it always boot from disk. In grub in edit mode I see that in two "UUID" lines are not the same. If I retype UUID from "first" to second "line" it boots from USB (as I wish). Is there any other way than fixing /boot/grub/grub.cfg each time? EDIT: the GRUB generated good when I booted from USB and grub-install from there, but question is still if it's possible ignore drives

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• Set default app for opening an extension [closed]

  - by Primož Kralj

  I am using Linux Mint 13 with Cinnamon. I have a problem setting an application to open a file with some extension when the application is actually only extracted, not really installed using apt-ger or .deb file. For example - Blender. You can download a .tar.gz from official site which you then extract and you can just run the app. However, it isn't listed in the default apps list (Right Clickon file - Open with other application - Show all installed apps). So now I have to always open the application first and open the file from there. How can I solve this?

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