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  • What are the safety benefits of a type system?

    - by vandros526
    In Javascript: The Good Parts by Douglas Crockford, he mentions in his inheritance chapter, "The other benefit of classical inheritance is that it includes the specification of a system of types. This mostly frees the programmer from having to write explicit casting operations, which is a very good thing because when casting, the safety benefits of a type system are lost." So first of all, what actually is safety? protection against data corruption, or hackers, or system malfunctions, etc? What are the safety benefits of a type system? What makes a type system different that allows it to provide these safety benefits?

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  • "merging" multiple hardrives for Ubuntu 14.04 install

    - by Thijser
    I have 3 hardrives inside my laptop 2 of which currently house other opperating systems but have a empty partitions of 8 and 9 gigabye and the third is just 12 gB (currently not partitioned at all). Now each of these 3 is to small to be useful to me, however combined they are 29gigs which can easily hold a ubuntu installation, and associated programs. Is there a way set up my installation in such a way that it threads these 3 disks as one? Or is there a way by which I can make it default storage of many things into one drive (downloads and sudo apt-get install for example) to one drive while keeping ubuntu onto another?

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  • How to see what's going on during shutdown

    - by Huygens
    Since a few weeks, Ubuntu freezes almost everytime when I shut it down. I know it because the shutdown animation stops and nothing is responsive: Ctrl+Alt+Del or AltGr+Syst+[r,e,i,s,u,b] don't make any difference. I have tried to look at various log files in /var/log but only INFO level message are logged. My hope to solve this problem would be to do a verbose shutdown, one where I could see what's going on, and so what's causing the problem, so I could start solving it. Therefore, as the title suggest it. Is there a way to see what's going on during shutdown? I could even go to the extreme of doing a step-by-step shutdown if this is the only way. Thanks for any tips.

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  • Adding sub-entities to existing entities. Should it be done in the Entity and Component classes?

    - by Coyote
    I'm in a situation where a player can be given the control of small parts of an entity (i.e. Left missile battery). Therefore I started implementing sub entities as follow. Entities are Objects with 3 arrays: pointers to components pointers to sub entities communication subscribers (temporary implementation) Now when an entity is built it has a few components as you might expect and also I can attach sub entities which are handled with some dedicated code in the Entity and Component classes. I noticed sub entities are sharing data in 3 parts: position: the sub entities are using the parent's position and their own as an offset. scrips: sub entities are draining ammo and energy from the parent. physics: sub entities add weight to the parent I made this to quickly go forward, but as I'm slowly fixing current implementations I wonder if this wasn't a mistake. Is my current implementation something commonly done? Will this implementation put me in a corner? I thought it might be a better thing to create some sort of SubEntityComponent where sub entities are attached and handled. But before changing anything I wanted to seek the community's wisdom.

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  • Asus X552VL WI-FI Problem

    - by Mitkobg
    I have a problem with my Wireless on my laptop. When i did rfkill list: 1: asus-wlan: Wireless LAN Soft blocked: no Hard blocked: no 2: asus-bluetooth: Bluetooth Soft blocked: no Hard blocked: no 4: hci0: Bluetooth Soft blocked: no Hard blocked: no 5: phy1: Wireless LAN Soft blocked: no Hard blocked: yes itko@Mitko:~$ iwconfig eth0 no wireless extensions. lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=off Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off mitko@Mitko:~$ lspci -nnk | grep -A2 0280 03:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01) Subsystem: AzureWave Device [1a3b:2c97] Kernel driver in use: ath9k mitko@Mitko:~$ lsmod | grep -e ath9k -e asus asus_nb_wmi 16990 0 asus_wmi 24191 1 asus_nb_wmi sparse_keymap 13948 1 asus_wmi ath9k 164164 0 ath9k_common 13551 1 ath9k ath9k_hw 453856 2 ath9k_common,ath9k ath 28698 3 ath9k_common,ath9k,ath9k_hw mac80211 626557 1 ath9k cfg80211 484040 4 wl,ath,ath9k,mac80211 wmi 19177 3 mxm_wmi,nouveau,asus_wmi video 19476 3 i915,nouveau,asus_wmi

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  • After upgrade: what's this envelope systray icon, and how do I get rid of it?

    - by David
    I've just upgraded from 13.04 to 13.10 and everything seems to be running fine. I have a couple new icons in my systray, though, and one of them -- the envelope icon -- is a mystery to me: It looks like a chat notifier (clicking it gives "Available", "Away", "Busy", etc., indicators) but I don't use Pidgin (never have), or it could be an email indicator but I don't use Thunderbird (never have). There's nothing else I can see (left- or right-clicking) that identifies it. I'd like to get rid of it, but "Startup applications" only lists the ones I have optionally added, and this is not among them. Any help appreciated!

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  • How does operating system software maintains time clocks?

    - by Neeraj
    Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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  • Lock System when certain hardware is removed

    - by er4z0r
    Hi all, I am working at a company where you are suppused to lock your screen whenever you leave your desk alone for a few minutes. Now I wondered if there is a nifty little tool that would lock my screen once a certain device is removed from the system. The ideal thing would of course be to have a short-range transmitter that causes the screen to be locked once it goes out of range. But for now I would also stick with removing a pen-drive from my laptop. I am pretty sure this is feasible. I just wan't to know if there are any preexistent projects.

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  • How can I easily retab html files according to some sane default?

    - by James
    I have some html files that I'd like to retab that look like this: <header> <div class="wrapper"> <img src="images/logo.png"> <div class="userbox"> <div class="welcome">Welcome Andy!</div> <div class="blackbox"> <ul> <li><a href="#">Invite Friends</a></li> <li><a href="#">My Account</a></li> <li><a href="#">Cart</a></li> <li><a href="#">Sign Out</a></li> </ul> </div> </div> </div> </header> And I want them to look something like this: <header> <div class="wrapper"> <img src="images/logo.png"> <div class="userbox"> <div class="welcome">Welcome Andy!</div> <div class="blackbox"> <ul> <li><a href="#">Invite Friends</a></li> <li><a href="#">My Account</a></li> <li><a href="#">Cart</a></li> <li><a href="#">Sign Out</a></li> </ul> </div> </div> </div> </header> Or some sane default. What's the easiest way to go about doing this from the terminal in ubuntu for all of the html files in the current directory?

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  • Spawn phone call from EC2 alerts

    - by Matt
    I have a system setup on AWS/EC2, it currently is using their CloudWatch alert system. The problem is this sends just to email, when ideally I would like this to be making a phone call and/or sending text messages to certain phone numbers when an alert fires (Note that I do not need the phone call to actually say anything, just call the person). We are trying to solve the problem that Amazon alerts are only useful if people are checking their email, which isnt always the case because all server problems love to happen at 4am on saturday... Please respond with any possible solutions/ideas, ideally I do not want to implement an entire monitoring system (IE: Nagios) on top of everything to handle this.

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  • You Couldn't Write it - Houston we have a problem!

    - by GrumpyOldDBA
    Note identities changed to protect the innocent (sic ). In a datacentre I have an iscsi san which provides storage for a SQL Cluster. It developed a fault and required replacement of a few parts, all hot swappable. Although we had suppport/warranty this did not include onsite so we arranged to have the parts delivered. The datacentre did not want to carry out the work so we had to arrange for the manufacturer to send an engineer. Times were arranged and interested/concerned parties put on standby...(read more)

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  • Solved: Operation is not valid due to the current state of the object

    - by ChrisD
    We use public static methods decorated with [WebMethod] to support our Ajax Postbacks.   Recently, I received an error from a UI developing stating he was receiving the following error when attempting his post back: {   "Message": "Operation is not valid due to the current state of the object.",   "StackTrace": "   at System.Web.Script.Serialization.ObjectConverter.ConvertDictionaryToObject(IDictionary`2 dictionary, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)\r\n   at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeInternal(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)\r\n   at System.Web.Script.Serialization.ObjectConverter.ConvertObjectToTypeMain(Object o, Type type, JavaScriptSerializer serializer, Boolean throwOnError, Object& convertedObject)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeDictionary(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeDictionary(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.DeserializeInternal(Int32 depth)\r\n   at System.Web.Script.Serialization.JavaScriptObjectDeserializer.BasicDeserialize(String input, Int32 depthLimit, JavaScriptSerializer serializer)\r\n   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize(JavaScriptSerializer serializer, String input, Type type, Int32 depthLimit)\r\n   at System.Web.Script.Serialization.JavaScriptSerializer.Deserialize[T](String input)\r\n   at System.Web.Script.Services.RestHandler.GetRawParamsFromPostRequest(HttpContext context, JavaScriptSerializer serializer)\r\n   at System.Web.Script.Services.RestHandler.GetRawParams(WebServiceMethodData methodData, HttpContext context)\r\n   at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)",   "ExceptionType": "System.InvalidOperationException" }   Goggling this error brought me little support.  All the results talked about increasing the aspnet:MaxJsonDeserializerMembers value to handle larger payloads.  Since 1) I’m not using the asp.net ajax model and 2) the payload is very small, this clearly was not the cause of my issue. Here’s the payload the UI developer was sending to the endpoint: {   "FundingSource": {     "__type": "XX.YY.Engine.Contract.Funding.EvidenceBasedFundingSource,  XX.YY.Engine.Contract",     "MeansType": 13,     "FundingMethodName": "LegalTender",   },   "AddToProfile": false,   "ProfileNickName": "",   "FundingAmount": 0 } By tweaking the JSON I’ve found the culprit. Apparently the default JSS Serializer used doesn’t like the assembly name in the __type value.  Removing the assembly portion of the type name resolved my issue. { "FundingSource": { "__type": "XX.YY.Engine.Contract.Funding.EvidenceBasedFundingSource", "MeansType": 13, "FundingMethodName": "LegalTender", }, "AddToProfile": false, "ProfileNickName": "", "FundingAmount": 0 }

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  • Download images and other documents from external websites

    - by user359650
    We're running a website which enables users to download documents about our company, such as: -wallpapers with the company logo. -company logos in various flavours. -media kits in pdf format. Since these files are quite big in size (some reach 1MB), we no longer want them to be downloaded from our website directly as it's consuming our bandwidth. Accordingly we've been looking into document sharing services. For instance we found Scribd which could allow us to share pdf files, but not our wallpapers and logos which are in png format. Is there a free service we can use for our users to reliably download any type of files we want to host? (ideally on a service which allows users to easily browse through our files).

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  • Stuttery 1080p playback on decent system

    - by Leo
    We have a media center system that was recently built. It works well for all types of content, however it has issues with 1080p content. 720p plays fine. I have tried VLC, ffdshow and finally, CoreAVC. CoreAVC plays the best however it still eventually loses sync due to stutter - this does not happen on other systems with the same file. Specs: Asrock 4core-2dual sata PCI Express ATI 2400 HD 1.5GB DDR 2100 Intel Pentium E5300 120GB Maxtor Diamondmax PATA Any ideas?

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  • Managing Files/Folder in Content Repositories or File Systems with Oracle ADF and WebCenter

    - by Shay Shmeltzer
    One more entry in a set of entries (1,2,3) about the capabilities that WebCenter adds to ADF applications. WebCenter is basically the new Portal framework in the Oracle stack - and one key thing that portals do is work with content, allowing you to compose and publish content from files as well as save and store content. In this demo you'll see how using a set of taskflows provided by WebCenter you can add a file management, creation and viewing capabilities to a regular ADF application. To try this out you don't need any fancy content management system - we'll just use your file system for now. All you need is the WebCenter extension installed in JDeveloper, and then you can follow the demo on your own JDeveloper instance. You'll define a connection to your content repository you'll be able to add a bunch of pre-built WebCenter taskflows into your page. And suddenly you can upload/download/create and view document directly from your applicaiton. Check it out:

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  • Why is filesystem preferred for logs instead of RDBMS?

    - by Yasir
    Question should be clear from its title. For example Apache saves its access and error logs in files instead of RDBMS no matter on how large or small scale it is being utilized. For RDMS we just have to write SQL queries and it will do the work while for files we must decide a particular format and then write regex or may be parsers to manipulate them. And those might even fail in particular circumstances if great care was not paid. Yet everyone seems to prefer filesystem for maintaining the logs. I am not biased against any of these methods but I would like to know why it is practiced like this. Is it speed or maintainability or something else?

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  • thunar-archive-plugin not working

    - by Sergio
    After I experienced serious not yet resolved performance issues with Nautilus I decided to move to XUbuntu so I installed its metapackage from Ubuntu and started using it. It turns out that the archive plugin for Thunar (provides the "Extract here" option in the contextual menu when right clicking over a compressed archive) is not working, even after I apt-get purged it and reinstalled. It simply doesn't show its options in the contextual menu. What should I do to make it work?

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  • upgrading my computer system for office use

    - by denise ellul
    Presently I have the under-mentioned computer system. What should be changed and upgraded with the following products that I own presently? I am interested in performance issues related to cache memory, bus speed, RAM, CAS latency as well as other considerations. Thanks for your help. Processor (CPU): Intel Celeron Dual Core E3300 2.5 GHz Motherboard: Asus P5QPL-AM G41 Main Memory (RAM): 2 GB Team Elite DDR2 PC8000 Case: Coolermaster RC330 Power Supply Unit: 500W EZ-Cool Standard Storage Device (Hard Drive): 500GB Samsung Video Card: Intel GMA X4500 (On-board) Optical Drive: LG GH22NS50 Sound Card: AC 97 (On – board) Card Reader: Akasa Black TFT Monitor: 19” View Sonic Speakers: Logitech S120 2.0

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  • Is there a taskbar applet to show the status of a remote host?

    - by Mathew
    At the end of the day I would like to be able to copy files to my home PC just in case I feel inspired to work on them in the evening. But I only want to do this if the PC is on already. (I can remote wake-on-lan the PC but I don't want to always be doing that). I would like some taskbar applet that shows the status of the PC and whether I can ssh into it or not. Obviously it would also be interesting to have an idea as to how long it is on for whilst I am at work as that gives a good indication of whether anyone is in or not. However being able to unobtrusively copy files to the remote machine is the main objective. Perhaps another approach is to run rsync on cron and if the remote host is not up then I guess it will fail. Is that correct? If anyone else has ideas on how to best sync a work and home PC then please do tell.

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  • Open source system for swipe card access?

    - by Moduspwnens
    We're looking at replacing our campus-wide magnetic swipe card system with something more robust. The "programmer" side of me says there's got to be an open-source, scalable solution that already does this, but all I've been able to find are proprietary vendor-specific solutions. Ideally, it'd have the following: Based on some open standard that allows us to select from a wide selection of card readers (like IMAP or HTTP) Support different kinds of card access (magnetic strip, RFIDs, etc.) Future-proof (to the extent possible) The lack of information I'm finding leads me to believe I'm not searching for the right things... or such a solution doesn't exist. Is there not some basic, open-source solution to this (like MySQL for databases, or Moodle for an LMS, or Apache for a web server)?

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  • Temporary R+W CIFS share for non-root accounts?

    - by Coder
    I want to set up a cross platform mail client (Thunderbird), and so far I want to use NAS as a profile store. The NAS is CIFS based, and can be mounted on both Windows and Ubuntu. Also the locking works fine for mutex, and setup seems to work as a proof of concept. The problem is the Linux mount. Since I'm using a laptop, I'm not always connected to network, hence, I can't use the /etc/fstab to set up CIFS share with a modified group id. And the share has to be mounted using mount -t cifs ..., which causes it to be owned by root, and owned so badly, that it can't be chowned to the regular user account. This causes read only issues for Thunderbird, which seem to be solved if Thunderbird is launched via sudo. But I would like to avoid that and use a script to mount the share on-demand to a profile location, with profile based privileges and access rights. Is there a way to achieve that?

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  • Windows 7 systeminfo reporting incorrect System Boot Time?

    - by rdingwall
    I work 9-5 and switch my PC off when I leave the office each day. When doing timesheets I need to know what time I got to work, so I usually use cmd systeminfo for finding the System Boot Time. Since upgrading to Windows 7 however, it's started reporting bizarre numbers between 11pm-2am instead of 8-9am. Today it says it booted at 11:34pm last night! I checked the event log and there is no entries between when I shutdown at 5:30pm yesterday and booted around 8am this morning. Has anyone else encountered this?

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  • System information shown when booting Debian

    - by WebDevHobo
    When booting Debian, you'll see it printing a lot of information about the system variables and such. I don't really need to see all that, so I'd like to modify some scripts to make sure that on boot, it just does what it has to do, without printing it on the screen. Just something I fancy. Offcourse, still seeing errors would be nice. But that long slur of text, I could do without. I've tried looking it up, but I can't find documentation on this specific thing anywhere.

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  • Can't access Ubuntu's shared folders from Windows 7

    - by endolith
    In Ubuntu Maverick, I've shared some folders using the Nautilus "Sharing Options" GUI. I can see them from Windows 7, but when I try to access them (from Windows) it asks for a username and password. No matter what I enter, it won't let me in. How do I configure this to share normally? Update: I've found that some of the shared folders let me in, but others don't. Of the ones that do, some of their subfolders do, others don't, etc. How can I investigate what's causing this?

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  • Networkmanager in systray gone and sound not working after update 13.10

    - by rubo77
    After upgrading my Xubuntu 13.04 to 13.10 I have no sound. I still have sound if I start VLC with sudo mpg123 test.mp3 So it seemd there is a right problem EDIT after adding myself to the group audio with adduser myself audio I could play sounds again from the desktop with VLC But one problem remaining: The systray, usually looking like this: is not working anymore. No audio-settings and no network-manager in the taskbar in XFCE: there is just one small box with nothing in it. When I install stalonetray, There I see the status of wicd and all the other statuses, so the systray seems to be broken.

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