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  • Should the syntax for disabling code differ from that of normal comments?

    - by deltreme
    For several reasons during development I sometimes comment out code. As I am chaotic and sometimes in a hurry, some of these make it to source control. I also use comments to clarify blocks of code. For instance: MyClass MyFunction() { (...) // return null; // TODO: dummy for now return obj; } Even though it "works" and alot of people do it this way, it annoys me that you cannot automatically distinguish commented-out code from "real" comments that clarify code: it adds noise when trying to read code you cannot search for commented-out code for for instance an on-commit hook in source control. Some languages support multiple single-line comment styles - for instance in PHP you can either use // or # for a single-line comment - and developers can agree on using one of these for commented-out code: # return null; // TODO: dummy for now return obj; Other languages - like C# which I am using today - have one style for single-line comments (right? I wish I was wrong). I have also seen examples of "commenting-out" code using compiler directives, which is great for large blocks of code, but a bit overkill for single lines as two new lines are required for the directive: #if compile_commented_out return null; // TODO: dummy for now #endif return obj; So as commenting-out code happens in every(?) language, shouldn't "disabled code" get its own syntax in language specifications? Are the pro's (separation of comments / disabled code, editors / source control acting on them) good enough and the cons ("shouldn't do commenting-out anyway", not a functional part of a language, potential IDE lag (thanks Thomas)) worth sacrificing? Edit I realise the example I used is silly; the dummy code could easily be removed as it is replaced by the actual code.

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  • Maximum Length Of IP Address: 15 (IPv4) & 39(IPv6)

    - by Gopinath
    Problem You are designing a database table for a web application that requires to store IP address of users who visits the site. The IP address is required to be stored a character data in the table. To define size of the character column you need to know maximum length of IP address. So, what is the maximum length of an IP address? Solution The IPv4 version of IP address is in the following format 255.255.255.255 To store IPv4 address we require 15 characters. The IPv6 version of IP address is grouped into sets of 4 hex digits separated by colons, like the below 2001:0db8:85a3:0000:0000:8a2e:0370:7334 To store IPv6 address you require a 39 characters long column. Conclusion As IPv4 and IPv6 are the commonly use protocols, you better define a column with 39 characters length so that both the format address are saved in to the table without any issues. This article titled,Maximum Length Of IP Address: 15 (IPv4) & 39(IPv6), was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Font corruption: lines through characters

    - by Aibara Iduas
    I have an odd problem where a one-pixel high white line is displayed through certain letters of text. Almost always only a single character type is affected at once, and only in one font size (though that size can change over time). Most of the time things are fine, but this happens several times a day. It's been happening ever since I upgraded to 10.10. I have noticed few patterns: It might be a problem with Firefox (I'm currently using the nightly ppa, but it occurred in 3.6 also) - but this could just be because I spend most of my time on my computer either at a browser or text editors. I seem to remember it happening with the buttons on various Gnome dialogs. It never occurs in text I've typed, be it an email, url bar, etc. In Firefox it happens across tabs, and the problem remains even if they are closed or reloaded; only restarting the program can fix it. Two examples (in the first, only the larger "r" is corrupted): Any help would be appreciated, thanks.

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  • Hidden characters inserted after pipe (|) followed by a space

    - by nifty
    Very often, on my Mac, when I use the pipe (|) character followed by a space character, an invincible character will be inserted in between. This is especially annoying when using the terminal, as it makes commands invalid. If I type the following in iterm2, I often get the following: ls | cat zsh: command not found:  cat If I hit the up-arrow-key to get my previous command, and then remove and reinsert the space between | and cat, the command will work. When I copy paste the working and non working commands into a file, like this: non-working: ls | cat working: ls | cat and open it in Hex Fiend it shows the following: non-working: ls |¬†cat working: ls | cat I've also experienced the same kind of issue in SublimeText2 using the square brackets ([]) followed by a space. So I don't believe its an issue with iTerm2.

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  • How do I install the latest 2012 TeX Live on 12.04?

    - by user74713
    The Tex Live included in Ubuntu 12.04 is very old (2009), and I would like to install the latest version to be able to edit the Ubuntu manual. How do I do that from the terminal? Hello, my name is Chris. I am a student pursuing a career in technical writing and I would like to assist the Ubuntu community while gaining experience & building my resume. I need to install upstream version of TeX Live for 12.04 to edit the manual for Ubuntu. I am having a difficult time installing it per the directions @ http://ubuntu-manual.org/getinvolved/editors#install-texlive. TeX Live documents are on my computer, but I am not able to run the install. No TeX Live program found on my computer. Any help is greatly appreciated! ~Thanx!~ Below I have listed the prior attempts & links to view the posts of each attempt: Backports I have tried using the official backports of the latest (2012) TeX-Live via their PPA. Please refer to link below for the particulars. How do I install the latest 2012 TeX Live on 12.04? Latex I've also tried running Latex as suggested. Please refer to link below for the particulars. http://ubuntuforums.org/showthread.php?t=2019051 PPA Causing Issue?? or something else I came across a post concerning the ability to install programs via the terminal and am wondering if it may be my problem??? Please refer to link below for the particulars. PPA - TeX Live Cannot install anything through Terminal - apt-get -f install

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  • Issue with Capslock key on Laptop

    - by Mr New
    For some reason my laptop has a mind of its own and the Caps Lock tends to come on whenever it feels like it. I thought it was an software issue from that reasoning, but I later cleared the OS and then reinstalled it hoping to fix the problem, but it didn't. Not only does it do that it also comes on and off whenever the letters A, S, and left shift key are pushed. So I assummed it was a keyboard issue and that the keyboard needs to be replaced, but it has one of those touch pad cap lock buttons also, because even when I press that button it tends to not react. So how can that be fixed with a keyboard replacement or is that connected still? EDIT - I followed the direction with the following code in notepad and it didn't do the job: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout] “Scancode Map”=hex:00000000 00000000 0200000000 00003A00 00000000

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  • ffmpeg encoding on QuadCore

    - by Gotys
    I am trying to push my server's CPU cores to the max, but no success. Encoding 2-pass style, set my "-threads" to 128 . When running 2nd pass , the CPU seems to be at 98% usage, but first pass run totally ignores "-threads" option. Using libx264 . Here is my preset: flags=+loop+mv4 cmp=256 partitions=+parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 me_method=hex subq=7 trellis=1 refs=5 bf=3 flags2=+bpyramid+wpred+mixed_refs+dct8x8 coder=1 me_range=16 g=250 keyint_min=25 sc_threshold=40 i_qfactor=0.71 qmin=10 qmax=51 qdiff=4 Is there any reason why the 1st pass is not utilizing my CPUs ? Thank you in advance! This community has always been very kind to me.

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  • ffmpeg encoding on QuadCore

    - by Gotys
    I am trying to push my server's CPU cores to the max, but no success. Encoding 2-pass style, set my "-threads" to 128 . When running 2nd pass , the CPU seems to be at 98% usage, but first pass run totally ignores "-threads" option. Using libx264 . Here is my preset: flags=+loop+mv4 cmp=256 partitions=+parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 me_method=hex subq=7 trellis=1 refs=5 bf=3 flags2=+bpyramid+wpred+mixed_refs+dct8x8 coder=1 me_range=16 g=250 keyint_min=25 sc_threshold=40 i_qfactor=0.71 qmin=10 qmax=51 qdiff=4 Is there any reason why the 1st pass is not utilizing my CPUs ? Thank you in advance! This community has always been very kind to me.

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  • Help with converting an XML into a 2D level (Actionscript 3.0)

    - by inzombiak
    I'm making a little platformer and wanted to use Ogmo to create my level. I've gotten everything to work except the level that my code generates is not the same as what I see in Ogmo. I've checked the array and it fits with the level in Ogmo, but when I loop through it with my code I get the wrong thing. I've included my code for creating the level as well as an image of what I get and what I'm supposed to get. EDIT: I tried to add it, but I couldn't get it to display properly Also, if any of you know of better level editors please let me know. xmlLoader.addEventListener(Event.COMPLETE, LoadXML); xmlLoader.load(new URLRequest("Level1.oel")); function LoadXML(e:Event):void { levelXML = new XML(e.target.data); xmlFilter = levelXML.* for each (var levelTest:XML in levelXML.*) { crack = levelTest; } levelArray = crack.split(''); trace(levelArray); count = 0; for(i = 0; i <= 23; i++) { for(j = 0; j <= 35; j++) { if(levelArray[i*36+j] == 1) { block = new Platform; s.addChild(block); block.x = j*20; block.y = i*20; count++; trace(i); trace(block.x); trace(j); trace(block.y); } } } trace(count);

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  • Choosing open source vs. proprietary CMS

    - by jkneip
    Hi- I've been tasked with redesigning a website for a small academic library. While only in charge of the site for 6 months, we've been maintaining static html pages edited in Dreamweaver for years. Last count of our total pages is around 400. Our university is going with an enterprise level solution called Sitefinity, although we maintain our own domain and are responsible to maintain our own presense. Some background-my library has a couple Microsoft IIS servers on which this static html site has been running. I'm advocating for the implementation of a CMS while doing this redesign. The problem is I'm basically the lone webmaster so I have no one to agree or disagree with my choice. There are also only 1-2 content editors right know for the site but a CMS could change that factor. I would like to use the functionality of having servers that run .NET and MS SQL but am more experience setting up and maintaining open source software like Wordpress or Drupal on web hosts. My main concern is choosing a CMS that will be easy to update / maintain / deal with upgrades (i.e., support) in case I'm not there in the future. So I'm wondering how to factor in the open source CMS vs. a relatively inexpensive commercial CMS decision and whether choosing PHP/MySQL vs. ASP.net framework for development environment will play into my decision. Thanks for any input that can be offered based on the details I've given. Thanks, Jason

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  • Stuck on Login PhpMyAdmin

    - by TMP
    Hi. I've isntalled phpmyadmin via apt-get. I've set the apache env-vars to the correct user:group. I've set ownership of /etc/apache2 and /etc/phpmyadmin to this user:group. I've restarted both apache2 and mysql several times. My Problem: When I access [ServerIP]/phpmyadmin I get the login screen, I enter the information, and i'm right back at the login screen, with not even an error "permission denied" or "password wrong" or whatever. The only things thats different is the URL: Instead of the Original http://[ServerIP]/phpmyadmin/index.php I am now at http://[ServerIP]/phpmyadmin/index.php?token=[Long Hex string here] However, still the login dialog. My Question: How Do I fix this?

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  • How do you save/export changes made in Firebug?

    - by blunders
    Using Firebug to edit CSS, how do I save/export changes made to the CSS? TOOLS: Firefox, Firebug MAJOR UPDATE: If you know of a way to lock the forward/back/refresh on a FireFox tab, please let me know. Otherwise, I've given up on using FireBug/FireDiff as an IDE for CSS, it's nice, but lol... press backspace at the wrong time and ALL your work is gone... funny. So, really like the browser highlighting to CSS/HTML in Firebug. Know any good CSS editors that do this? Really had hope FireBug would work, but for now only see it as being good for ad-hoc inspection and test; meaning using it for what it's made for. UPDATES: @Lèse majesté: Just as an update, "Web Developer add-on" does let you edit CSS, but it does not let you edit/save CSS changes made by Firebug. Meaning you use Firebug to ID and maybe test changes, but it does not let you save the changes from Firebug. Here's a "how to" covering how to use them together: FF + FB + WD @Lèse majesté: Still playing around with FireDiff. It works okay, found one bug already (although I'm just working around it), and there's no "how to" I've been able to find, so I'm just trying every feature and clicking around... (for example, to export a diff you must be over the last item in the list, right click, and select as "Save Diff". The ".diff" is just a text file, no idea why at this point the ext is .diff.

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  • VIM is great for text. Is there, too, an efficient, mouseless way to manipulate files on OS X?

    - by Dokkat
    I am having trouble navigating through files on OS X. That is, creating files, copying, moving, and so on. I am currently using the Finder, but the act of clicking with the mouse is not very efficient. Acessing a deep folder takes a considerable amount of time and you'll have to know it's entire path. When I try to use the command line it is even worse. Going to a folder requires at least typing it's entire path with the 'cd' command; and, when you are there, you don't have full control over it. For example, how would you move 3 specific files to another folder? Some text editors offer a 'fuzzy search' function that allows a very fast form of jumping through files. What is a fast, efficient way to navigate through files on OS X?

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  • Using HTML5 Today part 4&ndash;What happened to XHTML?

    - by Steve Albers
    This is the fourth entry in a series of descriptions & demos from the “Using HTML5 Today” user group presentation. For practical purposes, the original XHTML standard is a historical footnote, although XHTML transitional will probably live on forever in the default web page templates of old web page editors. The original XHTML spec was released in 2000, on the heels of the HTML 4.01 spec.  The plan was to move web development away from HTML to the more formal, rigorous approach that XHTML offered, but it was built on a principle that conflicts with the history and culture of the Internet: XHTML introduced the idea of Draconian Error Handling, which essentially means that invalid XML markup on a page will cause a page to stop rendering. There is a transitional mode offered in the original XHTML spec, but the goal was to move to D.E.H.  You can see the result by changing the doc type for a document to “application/xhtml+xml” - for my class example we change this setting in the web.config file: <staticContent> <remove fileExtension=".html" /> <mimeMap fileExtension=".html" mimeType="application/xhtml+xml" /> </staticContent> With the new strict syntax a simple error, in this case a duplicate </td> tag, can cause a critical page error: While XHTML became very popular in the ensuing decade, the Strict form of XHTML never achieved widespread use. Draconian Error Handling was one of the factors that led in time to the creation of the WHATWG, or Web Hypertext Application Technology Group.  WHATWG contributed to the eventually disbanding of the XHTML 2.0 working group and the W3C’s move to embrace the HTML5 standard. For developers who long for XML markup the W3C HTML5 standard includes an XHTML5 syntax. For the longer, more definitive look at what happened to XHTML and how HTML5 came to be check out the Dive Into HTML mirror site or Bruce Lawson’s “HTML5: Who, What, When Why” talk.

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  • Visually and audibly unambiguous subset of the Latin alphabet?

    - by elliot42
    Imagine you give someone a card with the code "5SBDO0" on it. In some fonts, the letter "S" is difficult to visually distinguish from the number five, (as with number zero and letter "O"). Reading the code out loud, it might be difficult to distinguish "B" from "D", necessitating saying "B as in boy," "D as in dog," or using a "phonetic alphabet" instead. What's the biggest subset of letters and numbers that will, in most cases, both look unambiguous visually and sound unambiguous when read aloud? Background: We want to generate a short string that can encode as many values as possible while still being easy to communicate. Imagine you have a 6-character string, "123456". In base 10 this can encode 10^6 values. In hex "1B23DF" you can encode 16^6 values in the same number of characters, but this can sound ambiguous when read aloud. ("B" vs. "D") Likewise for any string of N characters, you get (size of alphabet)^N values. The string is limited to a length of about six characters, due to wanting to fit easily within the capacity of human working memory capacity. Thus to find the max number of values we can encode, we need to find that largest unambiguous set of letters/numbers. There's no reason we can't consider the letters G-Z, and some common punctuation, but I don't want to have to go manually pairwise compare "does G sound like A?", "does G sound like B?", "does G sound like C" myself. As we know this would be O(n^2) linguistic work to do =)...

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  • emacs keybindings

    - by Max
    I read a lot about vim and emacs and how they make you much more productive, but I didn't know which one to pick. Finally when I decided to teach myself common lisp, the decision was straight forward: everybody says that there's no better editor for common lisp, than emacs + slime. So I started with emacs tutorial and immediately I ran into something that seems very unproductive to me. I'm talking about key bindings for cursor keys: forward/backward: Ctrl+f, Ctrl+b up/down: Ctrl+p, Ctrl+n I find these bindings very strange. I assume that fingers should be on their home rows (am I wrong here?), so to move cursor forward or backward I should use my left index finger and for up and down right pinky and right index fingers. When working with any of Windows IDEs and text editors to navigate text I usually place my right hand in a position so that my thumb is on the right ctrl and my index, ring and middle fingers are on the cursor keys. From this position it is very easy and comfortable to move cursor: I can do one-character moves with my 3 right fingers, or I can press ctrl with my right thumb and do word-moves instead. Also I can press shift with my left pinky and do single-character or word selections. Also it is a very comfortable position to reach PgUp, PgDn, Home, End, Delete and Backspace keys with my right hand. So I have even more navigation and selection possibilities. I understand that the decision not to use cursor keys is to allow one to use emacs to connect to remote terminal sessions, where these keys are not supported, but I still find the choice of cursor keys very unfortunate. Why not to use j, k, i, l instead? This way I could use my right hand without much finger stretching. So how is emacs more productive? What am I doing wrong?

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  • To decide where to crop an image, how can I highlight it's most compressible areas?

    - by Umber Ferrule
    I'm looking to get the most compression out of each of the most popular image formats, such as, JPEG, PNG, GIF, etc. Ideally, this would be a tool, or a series of transforms that could be performed (perhaps using a macro and then discarded) in popular image editors (Paint.NET/PaintShopPro/PhotoShop/GIMP) to highlight areas which will compress less. Alternatively, what rules of thumb can be used other than reducing colours (for PNG/GIF), reducing image dimensions, avoiding high detail areas... I'm not asking for help deciding what format to use for a particular image type as I think this is fairly common knowledge, i.e. diagram and images with few colours = PNG/GIF, photographs = JPEG.

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  • What does SVN do better than git?

    - by doug
    No question that the majority of debates over programmer tools distill to either personal choice (by the user) or design emphasis, i.e., optimizing design according to particular uses cases (by the tool builder). Text Editors are probably the most prominent example--a coder who works on a Windows at work and codes in Haskell on the Mac at home, values cross-platform and compiler integration and so chooses Emacs over Textmate, etc. It's less common that a newly introduced technology is genuinely, demonstrably superior to the extant options. I wonder if this is in fact the case with version-control systems, in particular, centralized VCS (CVS, SVN) versus distributed VCS (git, hg)? I used SVN for about five years, and SVN is currently used where I work. A little less than three years ago, I switched to git (and gitHub) for all of my personal projects. I can think of a number of advantages of git over subversion (and which for the most part abstract to advantages of distributed over centralized VCS), but I cannot think of one contra example--some task (that's relevant and arises in a programmers usual workflow) that subversion does better than git. The only conclusion I have drawn from this is that I don't have any data--not that git is better, etc. My guess is that such counter-examples exist, hence this question.

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  • What does the the reconstruction process of mdadm do exactly on raid10

    - by Azrael
    I've got a system with 4 disks set up as raid10. All disks are usable, and mdadm all states them with UUUU. Due to a recent system crash, the raid is currently reconstruction the raid as it was marked as "not clean," and a reconstruction process was started. On a closer look smartctl shows problems on one disk: sd 0:0:0:0: [sda] Unhandled sense code sd 0:0:0:0: [sda] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE sd 0:0:0:0: [sda] Sense Key : Medium Error [current] [descriptor] Descriptor sense data with sense descriptors (in hex): 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 24 cd 78 d4 sd 0:0:0:0: [sda] Add. Sense: Unrecovered read error - auto reallocate failed sd 0:0:0:0: [sda] CDB: Read(10): 28 00 24 cd 75 1e 00 04 00 00 With a research about the reconstruction process, I only found information concerning raid5 but nothing for raid10. Can I replace this problematic disk during the reconstruction process, or will I kill the raid with this?

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  • How can I read a portion of one Minecraft world file and write it into another?

    - by RapierMother
    I'm looking to read block data from one Minecraft world and write the data into certain places in another. I have a Minecraft world, let's say "TemplateWorld", and a 2D list of Point objects. I'm developing an application that should use the x and y values of these Points as x and z reference coordinates from which to read constant-sized areas of blocks from the TemplateWorld. It should then write these blocks into another Minecraft world at constant y coordinates, with x & z coordinates determined based on each Point's index in the 2D list. The issue is that, while I've found a decent amount of information online regarding Minecraft world formats, I haven't found what I really need: more of a breakdown by hex address of where/what everything is. For example, I could have the TemplateWorld actually be a .schematic file rather than a world; I just need to be able to read the bytes of the file, know that the actual block data starts always at a certain address (or after a certain instance of FF, etc.), and how it's stored. Once I know that, it's easy as pie to just read the bytes and store them.

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  • Updating windows xp hard drive controller from ubuntu live disk

    - by Joel
    The problem: When booting, I get a blue screen shortly after the Windows XP logo splash screen. The error code is 7b, and the second hex number is 0xC0000034. Based on this link (item 7) it appears the driver should be updated. Oddly, I made no changes to the drivers recently. I suspect it was something in a windows update or the newest upgrade of my antivirus (eset). But I digress. The BSOD makes me unable to boot into Windows at all, so I can't update the driver from there. I've run various bios-level diagnostics (including full surface scan) and the hd looks good. I'm also able to boot to an old ubuntu disk and read files from the hd. The question: Based on the above, it appears that I need to update the Windows hard drive controller from the ubuntu live disk. How do I do that?

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  • Graceful logout in dwm

    - by Riateche
    I want dwm to close all windows gracefully when I press quit hotkey. I like Unity behaviour: it displays list of windows denying logout (for example, editors with unsaved changes) and do not logout before all issues are resolved and applications are closed. By default, dwm just end X session and all running applications are killed. I was thinking about writing a script that will retrieve list of all windows, gracefully close them and wait for their processes to finish. But I even don't know how to close windows. The only way I know is using wmctrl, and this utility doesn't work with dwm.

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  • Problem with Ctrl key on a hp 2510p

    - by Ernelli
    I have a tricky problem with my corporate Compaq hp 2510p, the ctrl key is not working properly at all times. I belive that it is hooked in some filter chain that processes certain ctrl+[key] combinations which is very annoying. I would like some pointers on how to proceed when analysing what application/setup can can cause this kind of keyboard filtering to happen. Anyway some more background info: Ctrl works together with X, C, V. Both in editors and terminals (Ctrl-C, Z etc) but Ctrl-Shift-Esc and Ctrl-Alt-Del does not work. Very annoying so my only option for logging in us using HP's security app. Shift-Arrow works for selecting text, but not Ctrl-shift arrow to select word by word, but Ctrl-Arrow works when moving the caret word by word. Now the strange thing is that everything works ok with an external USB keyboard so it might be the driver, but still, google yields 0 when searching for the problem description. I have vm-ware player installed (but not running it), HP Protect Tools installed, if any of these could affect the keyboard driver.

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  • It is inconsiderate to place editor settings inside code files?

    - by Carlos Campderrós
    I know this is kind of a subjective question, but I'm curious if there's any good reason to place (or not place) editor settings inside code files. I'm thinking in vi modelines, but it is possible that this applies to other editors. In short, a vi modeline is a line inside a file that tells vi how to behave (indent with spaces or tabs, set tabwidth to X, autoindent by default or not, ...) that is placed inside a comment, so it won't affect the program/compiler when running. In a .c file it could be similar to // vim: noai:ts=4:sw=4 On one hand, I think this shouldn't be inside the file, as it is an editor setting and so belongs to an editor configuration file or property. On the other hand, for projects involving developers outside one company (that are not imposed an editor/settings) or collaborators on github/bitbucket/... it is an easy way to avoid breaking the code style (tabs vs spaces for example), but only for the ones that use that editor though. I cannot see any powerful enough reason to decide for or against this practice, so I am in doubt of what to do.

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  • Bold font shortcut in WordPress editor in Mac OS X? (The equivalent to Ctrl+b in Windows)

    - by javipas
    I've recently acquired a MacBook Air and I'm getting used to Mac OS X shortcuts. One that I can't find, though, is the change to bold a piece of text previously selected in the WordPress editor. I do this with a simple Ctrl+b after selecting the text in Windows, but the expected Command+b in Mac OS X does not work (in WordPress at least. It seems it works in other editors online and offline). Is there a shortcut for it... and for italics?

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