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• How often do you look for code examples?

  - by Newly Insecure

  I am a comp sci student with several years of experience in C and C++, and for the last few years I've been constantly working with Java/Objective C doing app dev and now I have switched to web dev and am mainly focused on ruby on rails and I came to the realization that (as with app dev, really) I reference other code wayyyy too much. I constantly google functionality for lots of things I imagine I should be able to do from scratch and it's really cracked my confidence a bit. Basic fundamentals are not an issue, I hate to use this as an example but I can run through javabat in both java/python at a sprint - obviously not an accomplishment and but what I mean to say is I have a strong base for the fundamentals I think? I was wondering how often you guys reference other code and does it just boil down to a lack of memorization of intricate tasks on my part? I know what I need to use typically but reference syntax constantly. Would love some advice and input on this, as it has been holding me back pretty solidly in terms of looking for work in this field even though I'm finishing my degree. My main reason for asking is not really about employment, but more that I don't want to be the only guy at a hackathon not hammering out nonstop code and sitting there with 20 google/github tabs open, and I have refrained from attending any due to a slight lack of confidence... tl;dr: I google for code examples for basically ALL semi advanced/advanced functionality, how to fix this and do you do as well?

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• SDL_DisplayFormat works, but not SDL_DisplayFormatAlpha

  - by Bounderby

  The following code is intended to display a green square on a black background. It executes, but the green square does not show up. However, if I change SDL_DisplayFormatAlpha to SDL_DisplayFormat the square is rendered correctly. So what don't I understand? It seems to me that I am creating *surface with an alpha mask and I am using SDL_MapRGBA to map my green color, so it would be consistent to use SDL_DisplayFormatAlpha as well. (I removed error-checking for clarity, but none of the SDL API calls fail in this example.) #include <SDL.h> int main(int argc, const char *argv[]) { SDL_Init( SDL_INIT_EVERYTHING ); SDL_Surface *screen = SDL_SetVideoMode( 640, 480, 32, SDL_HWSURFACE | SDL_DOUBLEBUF ); SDL_Surface *temp = SDL_CreateRGBSurface( SDL_HWSURFACE, 100, 100, 32, 0, 0, 0, ( SDL_BYTEORDER == SDL_BIG_ENDIAN ? 0x000000ff : 0xff000000 ) ); SDL_Surface *surface = SDL_DisplayFormatAlpha( temp ); SDL_FreeSurface( temp ); SDL_FillRect( surface, &surface->clip_rect, SDL_MapRGBA( screen->format, 0x00, 0xff, 0x00, 0xff ) ); SDL_Rect r; r.x = 50; r.y = 50; SDL_BlitSurface( surface, NULL, screen, &r ); SDL_Flip( screen ); SDL_Delay( 1000 ); SDL_Quit(); return 0; }

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• Enabling GTX 570

  - by Silas

  Hello i just built up my new system: Asus Rock Z77 Extreme 4 Intel i7 3770k 16 Gb Corsair Ram Zotac Nvidia GTX 570 bequiet! 630W Power supply 120 GB SSD So after i installed UBUNTU 12.04 64 bit. It ran smoothly. I downloaded and installed all the recommended updates. After checking the Sytem details the GTX 570 didnt show up as graphics unit. so i figured i needed to download the drivers. So i did but being a complete newbie to linux i didnt succeed in installing them. (I think) Anyway after several tries and errors i shut down the PC and restarted it. Resultung in do Signal to my screen after trying to reboot and all the monitor outs with no result i took out the graphic card and now it boots normally but after booting it says there is a problem with the system the graphics cant be recognized something something. So Question A: What do i do? I Like linux but the arbitrarity of the Errors that occur without any changes to the system scare me. Question B: Is there A beginners guide to Ubuntu where i could start from scratch because i really want this to work? Question C: Now that the System is (suddently) showing these graphic errors So far without visible consequence despite the error message. should i reinstall the GPU and give the driver installation another try or the other way around? Ill be very grateful for any help. Thank you in advance!

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• Ubuntu 12.04 wireless disabled even though the direct connectin (thru modem) is working fine

  - by user90841

  Need help with my newly installed Ubuntu 12.04 system (dual booting along with Win 7), even thoguh I can use internet using the modem and directly plugging it, the wireless network is disabled and it says firmware missing. I tried the following options: 1) checking to see if the wireless is disabled using the hot keys (F2 or Ctrl+F2, Fn + F2 keys), the wireless is working fine in Win 7 but not in Ubuntu. 2) I am able directly plug the laptop with the modem and able connect to Internet using Ubuntu. 3) From the top right hand menu bar, te Wireless networks options say "device not ready (firmware missing) and the Enable Wireless checkbox is checked. 4) tried the command "rfkill list" , it shows all are NOT blocked. 0: phy0: Wireless LAN soft blocked:no Hard blocked: no 1: dell-wifi: Wireless LAN soft blocked:no Hard blocked: no 2: dell-bluetooth: BlueTooth soft blocked:no Hard blocked: no 3: hci0 Bluetooth soft blocked:no Hard blocked: no 5) ifconfig command shows eth0 and lo (lcoalhost) up and running but the wlan0 option is not available to show unless I type ifconfig -a, when it shows wlan0 but its down. 6) The command lspci -vvnn | grep 14e4 shows 04:00.0 network Controller [0280]: Broadcom Corp BCM4312 802.11b/g LP-PHY [14e4:4315] {rev 01) 08:00.0 Ethernet Controller [0200]: Broadcom Corp Netlink BCM5784M Gigabit Ethernet PCIe [1434:1698] {rev 10) 7) The file /var/lib/NetworkManager/NetworkManager.state shows all options are true (networking enabled, wireless enabled, wwlanenabled and wimaxenabled all options are set to true). 8) 'additional drivers' in your Dash and/or Preferences do not bring up anything at all. 9) output for lshw -C network shows *-network DISABLED description : Wireless interface physical id: 4 logical name: wlan0 serial: 78:e4_00"43:b6:ab capabilities: ethernet physical wireless Configuration: broadcast=yes driver=b43 driverversion=3.2.0.29-generic-pae firmware=N/A link=no multicast= yes wireless=IEEE 802.11bg

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• Target a specific Button and Style it

  - by CoffeeAddict

  I've got a button inside my div. The image is showing some kind of padding around it <div id="member-name" hidden="true"> <span><button id="expandButton"><img src="~/Content/Images/plus.jpg" /></button></span><p id="member-fullName"></p> </div> Not sure how to get rid of this issue, see the grey around that plus image..I want to get rid of that. Here's the image alone, see that there is nothing around it: here is my css (just various related snippets to all this): div { padding: 0px;} input[type="submit"], input[type="button"], button { background-color: #ffffff; cursor: pointer; font-size: 11px; font-weight: 600; padding: 0px; margin: 0px; width: auto; vertical-align: middle; } #member-name { margin: 30px 0px 0px 0px; height: 20px; font-weight: bold; color: white; padding: 1px 1px 0px 1px; background-color: #d28105; border: 1px solid darkgray; overflow: hidden; } #member-name.p { display: inline-block; } /* #member-name.input[type="submit"] { margin: 0px;padding: 0px; } - this does not work, probably wrong syntax anyway */

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• How to make NFS mounts available while offline?

  - by lpanebr

  Problem: I work on a notebook and while at work I have access to many NFS mounted drives. When I get home they are obviously not available. Windows 7 solution: My business partner uses Windows 7 and maps the folders via samba. Windows 7 has a very nice feature that let's he make these folders available offline. So when when he connects to the work network the changes get synchronized! Question: Is there a way to mimic that in ubuntu? What I have now: Server to local sync: I have added rsync entries on my crontab to copy server folders => local folders every five minutes. When at work I used the NFS mapped folders and while outside work I use the local copies. When I get at work I manually run a script that syncs local folders => server folders. Problems with my setup: slow startup when not at work (I guess do to the fstab trying to map the server folders) no conflict checking/managing I have to remember to sync manually and be careful because of the different file locations recent files do not work between work and home

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• error while trying to resize the partition

  - by speedox

  im running out of space and i tried to resize the partition using g-parted but i got an error: Checking for bad sectors ... Bad cluster: 0x2904636 - 0x2904636 (1) Bad cluster: 0x290526d - 0x290526e (2) Bad cluster: 0x29052fd - 0x2905300 (4) Bad cluster: 0x2905392 - 0x2905392 (1) Bad cluster: 0x2905425 - 0x2905428 (4) Bad cluster: 0x290555d - 0x2905560 (4) Bad cluster: 0x29055f1 - 0x29055f8 (8) Bad cluster: 0x2905681 - 0x2905688 (8) Bad cluster: 0x29057ac - 0x29057ac (1) Bad cluster: 0x29887dd - 0x29887dd (1) Bad cluster: 0x299a086 - 0x299a086 (1) Bad cluster: 0x348ec05 - 0x348ec05 (1) Bad cluster: 0x353dabb - 0x353dabb (1) Bad cluster: 0x353dba4 - 0x353dba4 (1) Bad cluster: 0x354a162 - 0x354a162 (1) Bad cluster: 0x354a1ce - 0x354a1ce (1) ERROR: This software has detected that the disk has at least 40 bad sectors. **************************************************************************** * WARNING: The disk has bad sector. This means physical damage on the disk * * surface caused by deterioration, manufacturing faults or other reason. * * The reliability of the disk may stay stable or degrade fast. We suggest * * making a full backup urgently by running 'ntfsclone --rescue ...' then * * run 'chkdsk /f /r' on Windows and rebooot it TWICE! Then you can resize * * NTFS safely by additionally using the --bad-sectors option of ntfsresize.* **************************************************************************** I opened the "disk utility" and clicked on "Smart DATA" button I got this image:

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• How do 2D physics engines solve the problem of resolving collisions along tiled walls/floors in non-grid-based worlds?

  - by ssb

  I've been working on implementing my SAT algorithm which has been coming along well, but I've found that I'm at a wall when it comes to its actual use. There are plenty of questions regarding this issue on this site, but most of them either have no clear, good answer or have a solution based on checking grid positions. To restate the problem that I and many others are having, if you have a tiled surface, like a wall or a floor, consisting of several smaller component rectangles, and you traverse along them with another rectangle with force being applied into that structure, there are cases where the object gets caught on a false collision on an edge that faces the inside of the shape. I have spent a lot of time thinking about how I could possibly solve this without having to resort to a grid-based system, and I realized that physics engines do this properly. What I want to know is how they do this. What do physics engines do beyond basic SAT that allows this kind of proper collision resolution in complex environments? I've been looking through the source code to Box2D trying to find out how they do it but it's not quite as easy as looking at a Collision() method. I think I'm not good enough at physics to know what they're doing mathematically and not good enough at programming to know what they're doing programmatically. This is what I aim to fix.

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• Linux, GNU GCC, ld, version scripts and the ELF binary format -- How does it work? [closed]

  - by themoondothshine

  I'm trying to learn more about library versioning in Linux and how to put it all to work. Here's the context: I have two versions of a dynamic library which expose the same set of interfaces, say libsome1.so and libsome2.so. An application is linked against libsome1.so. This application uses libdl.so to dynamically load another module, say libmagic.so. Now libmagic.so is linked against libsome2.so. Obviously, without using linker scripts to hide symbols in libmagic.so, at run-time all calls to interfaces in libsome2.so are resolved to libsome1.so. This can be confirmed by checking the value returned by libVersion() against the value of the macro LIB_VERSION. So I try next to compile and link libmagic.so with a linker script which hides all symbols except 3 which are defined in libmagic.so and are exported by it. This works... Or at least libVersion() and LIB_VERSION values match (and it reports version 2 not 1). However, when some data structures are serialized to disk, I noticed some corruption. In the application's directory if I delete libsome1.so and create a soft link in its place to point to libsome2.so, everything works as expected and the same corruption does not happen. I can't help but think that this may be caused due to some conflict in the run-time linker's resolution of symbols. I've tried many things, like trying to link libsome2.so so that all symbols are alised to symbol@@VER_2 (which I am still confused about because the command nm -CD libsome2.so still lists symbols as symbol and not symbol@@VER_2), but nothing seems to work. What am I doing wrong?

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• Error on /home prevents OS boot

  - by mdrg

  Ok, I'll try to explain it listing the events: motherboard battery is weak, loses config everytime I shut the PC down; system clock usually back to 1990-something; this time, it went up to 2148; ubuntu became somewhat unusable (firefox refusing certificates, dropbox blocked), so I restarted; manually set the clock to current date and restarted; during boot, ubuntu detects errors and start auto-fix, rebooting itself in the middle of it (like a hard reboot, no shutdown messages) next time, shows boot animation screen in text mode, with an error message after a while: "Errors were found while checking the disk drive or /home", with "attempt to fix, ignore, skip mounting or manual recovery" None of the options during the boot work, they just type the text to the screen, then I'm forced to physically restart. Now I'm using Mint LXDE live CD, and I can see all my partitions just fine, including /home (my home folder blocked due to encryption, the other user folder is accessible and everything in place). I'm not sure how to proceed now. I'd like to just fix ubuntu boot without reinstalling or anything like it (at least until 12.04). What should I do now? can I easily fix this somewhow? Thanks!

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• DB Object passing between classes singleton, static or other?

  - by Stephen

  So I'm designing a reporting system at work it's my first project written OOP and I'm stuck on the design choice for the DB class. Obviously I only want to create one instance of the DB class per-session/user and then pass it to each of the classes that need it. What I don't know it what's best practice for implementing this. Currently I have code like the following:- class db { private $user = 'USER'; private $pass = 'PASS'; private $tables = array( 'user','report', 'etc...'); function __construct(){ //SET UP CONNECTION AND TABLES } }; class report{ function __construct ($params = array(), $db, $user) { //Error checking/handling trimed //$db is the database object we created $this->db = $db; //$this->user is the user object for the logged in user $this->user = $user; $this->reportCreate(); } public function setPermission($permissionId = 1) { //Note the $this->db is this the best practise solution? $this->db->permission->find($permissionId) //Note the $this->user is this the best practise solution? $this->user->checkPermission(1) $data=array(); $this->db->reportpermission->insert($data) } };//end report I've been reading about using static classes and have just come across Singletons (though these appear to be passé already?) so what's current best practice for doing this?

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• What is the correct way to implement Auth/ACL in MVC?

  - by WiseStrawberry

  I am looking into making a correctly laid out MVC Auth/ACL system. I think I want the authentication of a user (and the session handling) to be separate from the ACL system. (I don't know why but this seems a good idea from the things I've read.) What does MVC have to do with this question you ask? Because I wish for the application to be well integrated with my ACL. An example of a controller (CodeIgniter): <?php class forums extends MX_Controller { $allowed = array('users', 'admin'); $need_login = true; function __construct() { //example of checking if logged in. if($this->auth->logged_in() && $this->auth->is_admin()) { echo "you're logged in!"; } } public function add_topic() { if($this->auth->allowed('add_topic') { //some add topic things. } else { echo 'not allowed to add topic'; } } } ?> My thoughts $this->auth would be autoloaded in the system. I would like to check the $allowed array against the user currently (not) logged in and react accordingly. Is this a good way of doing things? I haven't seen much literature on MVC integration and Auth. I want to make things as easy as possible.

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• Is there a better strategy than relying on the compiler to catch errors?

  - by koan

  I've been programming in C and C++ for some time, although I would say I'm far from being an expert. For some time, I've been using various strategies to develop my code such as unit tests, test driven design, code reviews and so on. When I wrote my first programs in BASIC, I typed in long blocks before finding they would not run and they were a nightmare to debug. So I learned to write a small bit and then test it. These days, I often find myself repeatedly writing a small bit of code then using the compiler to find all the mistakes. That's OK if it picks up a typo but when you start adjusting the parameters types etc just to make it compile you can screw up the design. It also seems that the compiler is creeping into the design process when it should only be used for checking syntax. There's a danger here of over reliance on the compiler to make my programs better. Are there better strategies than this? I vaguely remember some time ago an article on a company developing a type of C compiler where an extra header file also specified the prototypes. The idea was that inconsistencies in the API definition would be easier to catch if you had to define it twice in different ways.

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• How to Edit aspx, Cshtml and other kind of files live on FTP server ?

  - by Anirudha

  Originally posted on: http://geekswithblogs.net/anirugu/archive/2013/06/27/how-to-edit-aspx-cshtml-and-other-kind-of-files.aspxMany time we just want to make a small changes on site and we don’t want to download the whole project again. In this post I will show you some good way to do it.   People who have Expression Web 4 can do it. I tried it and it’s work good with aspx file. If you have site in asp.net and use aspx engine then this is a good option. Well, Expression Web is free (previously paid software). A another good option is Komodo Edit. You can use komodo edit and few plugin to make FTP editing work for you. The problem in these 2 apps are they don’t have syntax highlight and support for CSHTML file which are introduced with MVC 3. For this I suggest you to go with webmatrix. You can use Webmatrix to edit cshtml file online. Remember that Webmatrix don’t support Compiling of MVC project. You need Visual Web developer Express at-least to compile your project. if you are in hurry try  https://c9.io/ put your FTP settings and you just got your hands ready to make changes on live site. If you have anything else in your mind share it here.

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• How often do you review fundamentals?

  - by mlnyc

  So I've been out of school for a year and a half now. In school, of course we covered all the fundamentals: OS, databases, programming languages (i.e. syntax, binding rules, exception handling, recursion, etc), and fundamental algorithms. the rest were more in-depth topics on things like NLP, data mining, etc. Now, a year ago if you would have told me to write a quicksort, or reverse a singly-linked list, analyze the time complexity of this 'naive' algorithm vs it's dynamic programming counterpart, etc I would have been able to give you a decent and hopefully satisfying answer. But if you would have asked me more real world questions I might have been stumped (things like how would handle logging for an application, or security difference between GET and POST, differences between SQL Server and Oracle SQL, anything I list on my resume as currently working with [jQuery questions, ColdFusion questions, ...] etc) Now, I feel things are the opposite. I haven't wrote my own sort since graduating, and I don't really have to worry much about theoretical things that do not naturally fall into problems I am trying to solve. For example, I might give you some great SQL solutions using an analytical function that I would have otherwise been stumped on or write a cool web application using angular or something but ask me to write an algo for insertAfter(Element* elem) and I might not be able to do it in a reasonable time frame. I guess my question here to the experienced programmers is how do you balance the need to both learn and experiment with new technologies (fun!), working on personal projects (also fun!) working and solving real world problems in a timeboxed environment (so I might reach out to a library that does what I want rather than re-invent the wheel so that I can focus on the problem I am trying to solve) (work, basically), and refreshing on old theoretical material which is still valid for interviews and such (can be a drag)? Do you review older material (such as famous algorithms, dynamic programming, Big-O analysis, locking implementations) regularly or just when you need it? How much time do you dedicate to both in your 'deliberate practice' and do you have a certain to-do list of topics that you want to work on?

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• Tile sizes in 2D games

  - by Ephismen

  While developing a small game using tile-mapping method a question came to my mind: I would develop the game on Windows but wouldn't exclude adapting it to another platform. What size(in pixels) would you recommend using for creating the tiles of a tile-mapped game(ie: RPG) with the following requirements? Have an acceptable level of detail without having too many tiles. Having a decent map size. Allow adaptation of the game on a handheld(ie: PSP), smartphone or a computer without too much loss of detail or slowdowns. Allow more or less important zoom-in / zoom-out. Have a resolution of tile that permits either pixel-perfect collision or block-collision. Anything from a good explanation to a game example is useful as long as it can fit the requirements. This question may seem a bit simplistic, but I noticed that many Indies game developer were using inappropriate scales scenery. Also sorry for the poor syntax and the lack of vocabulary of my question, being a non-native English speaker doesn't help when talking about computers programming.

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• Handling commands or events that wait for an action to be completed afterwards

  - by virulent

  Say you have two events: Action1 and Action2. When you receive Action1, you want to store some arbitrary data to be used the next time Action2 rolls around. Optimally, Action1 is normally a command however it can also be other events. The idea is still the same. The current way I am implementing this is by storing state and then simply checking when Action2 is called if that specific state is there. This is obviously a bit messy and leads to a lot of redundant code. Here is an example of how I am doing that, in pseudocode form (and broken down quite a bit, obviously): void onAction1(event) { Player = event.getPlayer() Player.addState("my_action_to_do") } void onAction2(event) { Player = event.getPlayer() if not Player.hasState("my_action_to_do") { return } // Do something } When doing this for a lot of other actions it gets somewhat ugly and I wanted to know if there is something I can do to improve upon it. I was thinking of something like this, which wouldn't require passing data around, but is this also not the right direction? void onAction1(event) { Player = event.getPlayer() Player.onAction2(new Runnable() { public void run() { // Do something } }) } If one wanted to take it even further, could you not simply do this? void onPlayerEnter(event) { // When they join the server Player = event.getPlayer() Player.onAction1(new Runnable() { public void run() { // Now wait for action 2 Player.onAction2(new Runnable() { // Do something }) } }, true) // TRUE would be to repeat the event, // not remove it after it is called. } Any input would be wonderful.

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• Are there any good resources for refactoring existing C# code to use LINQ while keeping your tests passing?

  - by Paddyslacker

  I've been teaching myself a little LINQ and an exercise I thought would be useful was to take my existing Project Euler C# code, which I built using Test Driven Development and gradually convert it to LINQ. I realise that LINQ is not always the best solution for all of the Project Euler problems, but I don't want to get into that here. I'm wondering whether or not it's feasible to refactor "traditional" OO C# code to use LINQ and functional programming syntax whilst keeping all of your tests passing. I can't find a way to make the tiny steps I'm used to making using TDD when converting to LINQ and this is a roadblock for me. I seem to have to make large changes to come up with a single function that I then replace whole chunks of my code with. I realise I could write this from scratch in LINQ, but in the real world, I'd like to be able to replace parts of my existing C# code to take advantage of LINQ where appropriate. Has anyone been successful with this approach? What resources did you find useful for refactoring existing C# code to use LINQ whilst taking a Test Driven Development approach?

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• What is the canonical approach to using a VCS right from a project's infancy?

  - by Anonymous -

  Background I've used VCS (mainly git) in the past to manage many existing projects and it works great. Typically with an existing project, I would check in each change I make to the code that either optimizes or changes the overall functionality (you know what I mean, in suitable steps, not every single line I change). Problem One thing I've not had so much practise at is creating new projects. I'm in the process of starting a new project of my own that will probably grow quite large, but I'm finding that there is a lot to do and a lot changing in the first few days/hours/weeks/the period up until the product is actually functioning in it's most basic form. Is there any point in me checking in each step of the process as I would with an existing project? I'm not breaking the project with changes I make since it isn't working yet. At the moment I've simply been using VCS as a backup at the end of each day, when I leave the computer. My first few commits were things like "Basic directory structure in place" and "DB tables created". How should I use a VCS when starting a new project?

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• How to go about designing an intermediate routing filter program to accept input and forward accordingly?

  - by phileaton

  My predicament: I designed an app, written in Python, to read my mail and check for messages that contain a certain digital signature. It opens these and looks for keywords. If the message contains these keywords, certain related functions area executed on the computer. It is a way I can control my computer from my cell phone without being there. I am still in the beginning stages and it can only currently remotely open and close applications/processes. The obvious issue is security risks. I hoped to spearhead that by requiring and checking for that digital signature. However, my issue comes when I'd like to make this program usable by multiple users. The idea is that the user will send keywords: username and password, for instance, to log into their personal email account and send messages to it to be parsed. Please ignore the security implications of sending non-encoded passwords through email. (Though if you could help me on that part I'd much appreciate it as well, but currently, that is not the scope of my question.) My issue is designing an intermediary process that will take an email/password to read an email and scan for those keywords. The issue is, that the program has to be accessing an email to read the email for the username/password! I have got myself into a loop and cannot figure out how to have this required intermediary program. I could just create an arbitrary email account and have that check for login-creds, but is there a better way of doing this than that? Also, is there a better way of communicating with a computer remotely than this? Especially if the computer is not a server and is behind a router with only a subnet ip? If I am asking this question in the wrong place, I deeply apologize. Any help would be much appreciated!

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• My feenix nascita mouse isn't moving my cursor. Ubuntu version appears to not matter. How do I debug this, and get the mouse working?

  - by NullVoxPopuli

  I had 13.04, upgraded to 13.10, and did a fresh install of 13.10, no luck. Any ideas? Just tail -f'd my syslog and plugged in the mouse. here is what I got: Oct 26 16:15:50 Orithyia kernel: [83369.618365] usb 1-1.5.2: new full-speed USB device number 6 using ehci-pci Oct 26 16:15:50 Orithyia kernel: [83369.718913] usb 1-1.5.2: New USB device found, idVendor=04d9, idProduct=a081 Oct 26 16:15:50 Orithyia kernel: [83369.718919] usb 1-1.5.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 Oct 26 16:15:50 Orithyia kernel: [83369.718921] usb 1-1.5.2: Product: USB Gaming Mouse Oct 26 16:15:50 Orithyia kernel: [83369.718924] usb 1-1.5.2: Manufacturer: Holtek Oct 26 16:15:50 Orithyia kernel: [83369.722486] input: Holtek USB Gaming Mouse as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5.2/1-1.5.2:1.0/input/input13 Oct 26 16:15:50 Orithyia kernel: [83369.722786] hid-generic 0003:04D9:A081.0004: input,hidraw3: USB HID v1.10 Keyboard [Holtek USB Gaming Mouse] on usb-0000:00:1a.0-1.5.2/input0 Oct 26 16:15:50 Orithyia kernel: [83369.729362] hid-generic 0003:04D9:A081.0005: usage index exceeded Oct 26 16:15:50 Orithyia kernel: [83369.729366] hid-generic 0003:04D9:A081.0005: item 0 2 2 2 parsing failed Oct 26 16:15:50 Orithyia kernel: [83369.729379] hid-generic: probe of 0003:04D9:A081.0005 failed with error -22 Oct 26 16:15:50 Orithyia kernel: [83369.731759] hid-generic 0003:04D9:A081.0006: hiddev0,hidraw4: USB HID v1.10 Device [Holtek USB Gaming Mouse] on usb-0000:00:1a.0-1.5.2/input2 Oct 26 16:15:50 Orithyia mtp-probe: checking bus 1, device 6: "/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5.2" Oct 26 16:15:50 Orithyia mtp-probe: bus: 1, device: 6 was not an MTP device So, I see it did see it is a mouse... but the cursor doesn't move when I move the mouse. Not sure where to debug from here.

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• Bikeshedding: Placeholders in strings

  - by dotancohen

  I find that I sometimes use placeholders in strings, like this: $ cat example-apache <VirtualHost *:80> ServerName ##DOMAIN_NAME## ServerAlias www.##DOMAIN_NAME## DocumentRoot /var/www/##DOMAIN_NAME##/public_html </VirtualHost> Now I am sure that it is a minor issue if the placeholder is ##DOMAIN_NAME##, !!DOMAIN_NAME!!, {{DOMAIN_NAME}}, or some other variant. However, I now need to standardize with other developers on a project, and we all have a vested interest in having our own placeholder format made standard in the organization. Are there any good reasons for choosing any of these, or others? I am trying to quantify these considerations: Aesthetics and usability. For example, __dict__ may be hard to read as we don't know how many underscores are in there. Compatibility. Will some language try to do something funny with {} syntax in a string (such as PHP does with "Welcome to {$siteName} today!")? Actually, I know that PHP and Python won't, but others? Will a C++ preprocessor choke on ## format? If I need to store the value in some SQL engine, will it not consider something a comment? Any other pitfalls to be wary of? Maintainability. Will the new guy mistake ##SOME_PLACEHOLDER## as a language construct? The unknown. Surely the wise folk here will think of other aspects of this decision that I have not thought of. I might be bikeshedding this, but if there are real issues that might be lurking then I would certainly like to know about them before mandating that our developers adhere to a potentially-problematic convention.

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• Entry level engineer question regarding memory management

  - by Ealianis

  It has been a few months since I started my position as an entry level software developer. Now that I am past some learning curves (e.g. the language, jargon, syntax of VB and C#) I'm starting to focus on more esoteric topics, as to write better software. A simple question I presented to a fellow coworker was responded with "I'm focusing on the wrong things." While I respect this coworker I do disagree that this is a "wrong thing" to focus upon. Here was the code (in VB) and followed by the question. Note: The Function GenerateAlert() returns an integer. Dim alertID as Integer = GenerateAlert() _errorDictionary.Add(argErrorID, NewErrorInfo(Now(), alertID)) vs... _errorDictionary.Add(argErrorID, New ErrorInfo(Now(), GenerateAlert())) I originally wrote the latter and rewrote it with the "Dim alertID" so that someone else might find it easier to read. But here was my concern and question: Should one write this with the Dim AlertID, it would in fact take up more memory; finite but more, and should this method be called many times could it lead to an issue? How will .NET handle this object AlertID. Outside of .NET should one manually dispose of the object after use (near the end of the sub). I want to ensure I become a knowledgeable programmer that does not just rely upon garbage collection. Am I over thinking this? Am I focusing on the wrong things?

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• how to congest a link using iperf

  - by navaz

  I have setup like below. Switch1-------------------- Switch2 | | | | | | | | | | | | PC1 PC2 PC3 PC4 I have a video traffic is flowing between PC1 and PC4. I have configured PC2 as iperf server. ( iperf -s ) and PC3 as client . (iperf -c 10.10.10.2 -P 20 -t 10000) where 10.10.10.2 is PC2 IP. now I am seeing most of the traffic in a link (switch1---switch2) is iperf. (TCP). I have observed from the logs that 1 out of 300 packet is UDP. Still I am not seeing any difference in the quality of video streaming in PC4. It looks similar compared to the case with no iperf. I am checking QOS, I have tried many options with iperf, couldnt succeed. I want to diminish the quality of video streaming in PC4. Could you please tell me what options can be used along with iperf to do it. Bandwidth between Switch1---switch2 is 1Gbits/sec. Thanks in advance

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• Should I be concerned that I can't program very fast without Google? [closed]

  - by seth

  Possible Duplicate: Google is good or bad for programmer? I'm currently in college to be a software engineer, and one of the main principles taught to us is how to learn for ourselves, and how to search the web when we have a doubt. This leads to a proactive attitude - when I need something, I go get it. Recently, I started wondering how much development would I be able to do without internet access and the answer bugged me quite a bit. I know the concept of the languages and how to use them, but I was amazed by how "slow" things were without having the Google to help in the development. Most of the problems I have are related to specific syntax. For example, reading and writing to a file in Java. I have done this about a dozen times in my life, yet every time I need to do it, I end up googling "read file java" and refreshing my memory. I completely understand the code and fully understand what it does, but I am sure that without Google it would take me a few tries to get the code correct. Is this normal? Should I be worried and try to change something in my programming behaviour?

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