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• Can't boot after disk error 12.10

  - by user1189907

  Lately, I've been having Ubuntu crashing randomly.. it goes into read only mode, but once I restart it's working again. Today it happened again and I had to manually shut the computer down. Now I'm not able to boot anymore. I get the following when turning the computer on: error: unknown filesystem And I'm left at "grub rescue". I booted from the Live CD and installed "boot-repair". When I run it it says "no os has been found on this computer", it gives me no option to carry out any fixes. Boot Repair generated the following output which shows some errors: http://paste.ubuntu.com/1348224/ Any idea on how to fix this?

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• Should the networking of my game be a component or a service?

  - by aalcutt

  I am working on a windows game and I am trying to understand the XNA GameComponents and GameServices classes and use. From what I understand about a component is that it has an Update method that gets call in every frame, and a service can be referenced from other components if needed. So the way I think a network component would work is that in its Update method it would receive and send data. It probably makes sense to receive the network data once per frame, but it doesn't for sending it. Shouldn't the game send its own updates to others the moment it has it to cut down on lag?

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• VS2010 Gotcha: Inadvertently targeting the wrong framework

  I love VS2010s multi-framework targeting feature, yet it has bitten me in the rear-end more than once. The problem is that I have created projects in .NET 3.5 without realizing it, then at some point, when something doesnt work as expected, if Im lucky I discover the mistake. Typically, this happens after you have explicitly chosen .NET 3.5 as the target framework. Then every project after that will be .NET 3.5 until you explicitly choose .NET 4.0 again. This morning that wasnt the case. I was...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to create a manager class without global variables nor singletons?

  - by Omega

  I would like to implement some kind of manager class in my application. It will be in charge of loading textures, processing them, distributing them etc... At first, I wanted to make a global variable that simply contains an instance of my manager class. I found this question: http://stackoverflow.com/questions/4646577/global-variables-in-java. However, the users there seem to recommend to never use global variables. Fine then, I once heard about Singletons, so I though I could use that instead. I mean, creating just one instance of my manager class sounds good. However, I found this other question: When is Singleton appropriate?, which basically tells me that Singletons are, in most scenarios, some kind of anti-pattern. Now I am a bit lost - what other approach can I take to create my manager class, whose only requirement is to be accessible from anywhere?

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• what do you do when you are stuck at programming and you don't have access to internet? [migrated]

  - by minusSeven

  This is a question most of us have faced while programming. Getting stuck! It might be a programmatic problem or tool problem, most of us eventually face it. You know something is supposed to work some way but just doesn't. You tried a number of things to solve it but isn't helping and you are not sure why. I once remember being stuck hours at programming job. Eventually I figured out for some reason or other my IDE wasn't recompiling my new changes in some of the classes .This is just an example but I am sure most you have faced similar situation. So how would you go about solving it if you didn't have access to Google or Stack Exchange? Lets be honest, using internet you aren't solving the problem, somebody else is doing it for you. So if you didn't have access to internet or a friend who might help, how would you go about solving it?

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• Do games use threads?

  - by Nubcake

  I understand that the concept of how a game runs i.e while (game_loop = true) { //handle events // input/output/sound etc } But it has come to my attention while programming in another HLL is do some games use threads for certain operations? For example take any Pokemon game ; during interaction a textbox appears to display information. Now I've been trying to simulate that sort of textbox and the only way I could have got it to be exactly the same is by using a loop and yes once a loop is started there is no way to handle window events unless they are handled again inside the loop itself. I couldn't have used this loop inside a different thread other than the main one (due to a DirectX limitation) so the only option was to use it inside the main program thread. I was wondering if some games work like this ; do they only use the main program thread and handle events again if they're inside a loop? Edit: I forgot to mention this is about console games not PC games! Thanks Nubcake

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• my laptop touchpad stops working during the live demo

  - by user170453

  I m completely new to all of this... I just want to install ubuntu because it is suppose to get rid of most of the virus problems, so anyway I was following online instructions to install ubuntu alongside windows 7 these are my laptop specifications. I tried booting with a pendrive using netbootin and other similar program but once I boot the laptop in ubuntu I click try without installing button and go to desktop then my mouse stops working. What am I supposed to do or what am I doing wrong?? Also please suggest a thread for proper installation of ubuntu alongside Windows 7. Thank you.

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• Spurious resets on Ubuntu

  - by boone2048

  I have a PC running Ubuntu 13.04 64bit, and I do weekly updates, so everything should be up-to-date. Everything is running fine, but sometimes, once-twice a week a complete reset happens. I think it must be software or hardware (perhaps Videocard) related, but I can't figure out what could be wrong. Can anybody suggest some ways, log files, where I could continue to search? By looking just at dmesg/dmesg.0 and Xorg.0.log I got nowhere. I cant find even a user application segfault. Any help is really appreciated.

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• 4oD (UK) - Can't stream

  - by lordqwerty

  I'm using the most up-to-date version of firefox and flash player. When I go on 4oD and press play I used to get the loading screen showing forever with nothing playing. I then had a search and someone suggested to turn off Ad-Block. So I did and it plays the advertisements. Once the last ad has played it does nothing. Has anyone else got this problem? Has anyone managed to fix it? Any help would be appreciated. Thanks.

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• Difficult to replicate objects (object Customer) on the list? [migrated]

  - by gandolf

  I wrote a program that does work with files like delete and update, store, and search And all customers But I have a problem with the method is LoadAll Once the data are read from the file and then Deserialize the object becomes But when I want to save the list of objects in the list are repeated. How can I prevent the duplication in this code? var customerStr = File.ReadAllLines (address); The code is written in CustomerDataAccess class DataAccess Layer. Project File The main problem with the method LoadAll Code: public ICollection<Customer> LoadAll() { var alldata = File.ReadAllLines(address); List<Customer> lst = new List<Customer>(); foreach (var s in alldata) { var objCustomer = customerSerializer.Deserialize(s); lst.Add(objCustomer); } return lst; }

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• Add comment to subversion commit automatically

  - by Paul Alexander

  I've already got my subversion repository set up to require comments of a minimum length to accept a commit. However, I'd like to start tagging those comments with information from our bug tracking system when committed. I've already got the scripts set up to pull data from the bug tracker and just need a way to get that info into the subversion commit comments. How can append to the existing comment in subversion automatically? For reference, the subversion repository is hosted on a linux server with Ubuntu 9 something installed and I have complete root access to the machine.

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• Ninject & Entity Framework =(sometimes) "The ObjectContext instance has been disposed ..."

  - by n26

  I am using Ninject and ADO.Net Entity Framework in my Aps.Net (Mvc) website. I bind the ObjectContext to Ninject using the RequestScope: Bind<Entities>().ToSelf().InRequestScope().WithConstructorArgument("connectionString", _connectionString); In most cases this works perferct. But sometimes I got the following error: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection. This error occurs at different positions while getting, updating, inserting or deleting data. In some cases this error occurs until I reset my webapp and sometimes it disappears after some requests. I am displeased that I have no more details. Because it seems that there is no pattern when and where this error occurs. Because the time and position is allways different :( Some hints or ideas?

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• asp.net mvc Ajax.BeginForm

  - by Bala R

  Hello, I'm having some difficulties with Ajax.BeginForm I have something like this in a view <% using (Ajax.BeginForm("ActionName", null , null, new { id = "FormName" })) {%> <input type="hidden" value = '<%= Html.Encode( Model.id) %>' name="id"/> <textarea id="message" name=message rows="4" style="width: 90%"> </textarea> <% }%} And the action method is something like this [AcceptVerbs(HttpVerbs.Post)] [Authorize] public ActionResult ActionName(int id, string message) { .... } I'm trying to pass the 'id' and 'message' to the action method. I'm passing 'null' for routeValues but I dont know what to pass. Ideally I was trying to find an overload that did not require route values but took actionName and htmlattributes (for form name) but I could not find one.I don't want to add 'message' to the view-model and I do need the FormName in there for jquery operations. What is the best way to work around this problem ?

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• user input of one php script pass to another php without modification in first php script

  - by ish12

  hi all.. Consider two php scripts(o.php & t.php) o.php contains both html and php. html here gets user input for eg:user name and password this information is passed to php using php-self. I want the user input of o.php passed to t.php without any modification in o.php. I ve used include and require in the t.php but the problem is it displays the output of o.php but i need only the user input values from o.php without displaying the output of o.php. Using functions or session in o.php we can pass user input but am in the situation tat i should not add or modify o.php. thanks in advance!!

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• Need Java https proxy which can be enhanced to emulate production https proxy behaviour

  - by Thorbjørn Ravn Andersen

  I have a production environment which require access through a proxy server. Occasionally said server returns blank responses badly confusing the Metro web service library causing all kinds of interesting RuntimeExceptions. I believe the proxy is Squid. In order to handle these better, I would like to set up a similar scenario here with a local proxy under my control causing all kinds of interesting failures. A quick survey strongly indicated I was not asking right. So, the question is, is there a simple, open source HTTPS/HTTP whatever proxy written in Java suitable for this purpose?

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• Compile Delphi component package (bpl) for different Delphi versions

  - by FractalizeR

  Hello. The situation is the following. Typically I use RAD Studio 2010 for Delphi development. I have some components I would like to redistribute in binary form (*.bpl without source). But I would like people to be able to use them despite of their Delphi version. But, for example, dcu files can be used only by compiler version, which generated them. Almost the same situation is with bpl files as I know. Every bpl file will require corresponding VCLXX.bpl library depending on Delphi version. How do I make my bpls, compiled in 2010 to be able to be used in Delphi7, 2007 etc? Is the only solution to have ALL Delphi versions installed and compile bpl files separately in each?

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• ASP. NET MVC2: Where abouts do I set Current.User from a Session variable?

  - by Adam Brown

  Hi, I'm trying to get authentication and authorisation working in an ASP .NET MVC2 site. I've read loads of tutorials and some books which explain how you can use attributes to require authorisation (and membership in a role) like this: [Authorize(Roles="Admin")] public ActionResult Index() { return View(); } I've made classes that implement IIdentity and IPrincipal, I create a userPrincipal object once the user has successfully logged in and I add it to a session variable. When the user goes to another page I want it to set the HttpContext.Current.User to the object that I stored in the session, something like this: if (Session["User"] != null) { HttpContext.Current.User = Session["User"] as MyUser; } My question is: Where abouts do I put the code directly above? I tried Application_AuthenticateRequest but it tells me Session state is not available in this context. Many thanks.

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• Very large database, very small portion most being retrieved in real time

  - by ming yeow

  Hi folks, I have an interesting database problem. I have a DB that is 150GB in size. My memory buffer is 8GB. Most of my data is rarely being retrieved, or mainly being retrieved by backend processes. I would very much prefer to keep them around because some features require them. Some of it (namely some tables, and some identifiable parts of certain tables) are used very often in a user facing manner How can I make sure that the latter is always being kept in memory? (there is more than enough space for these) More info: We are on Ruby on rails. The database is MYSQL, our tables are stored using INNODB. We are sharding the data across 2 partitions. Because we are sharding it, we store most of our data using JSON blobs, while indexing only the primary keys

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• Program received signal: “0”. warning: check_safe_call: could not restore current frame

  - by Kaushik

  Require urgent help!:( i m developing a game and i m dealing with around 20 images at the same time. As per my knowledge, i m allocating and deallocating the images at right places. Game runs for around 15 min fine but quits with an error message: "Program received signal: “0”. warning: check_safe_call: could not restore current frame" i also tried debugging with memory leak tools provided in Xcode but could not find any issue with memory management or any increase in memory size on simulator it works fine but not on the device. i m confused wht can be the issue. Any help is appreciated. Thanx in advance

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• Linq where clause with multiple conditions and null check

  - by SocialAddict

  I'm trying to check if a date is not null in linq and if it isn't check its a past date. QuestionnaireRepo.FindAll(q => !q.ExpiredDate.HasValue || q.ExpiredDate >DateTime.Now).OrderByDescending(order => order.CreatedDate); I need the second check to only apply if the first is true. I am using a single repository pattern and FindAll accepted a where clause ANy ideas? There are lots of similar questions on here but not that give the answer, I'm very new to Linq as you may of guessed :) Edit: I get the results I require now but it will be checking the conditional on null values in some cases. Is this not a bad thing?

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• WPF DataGrid DataGridHyperlinkColumn bound to Uri

  - by MicMit

  No problem when binding to a property of string type ( "http://something.com" ). However , I seem to have seen in old examples direct binding to Uri property. <dg:DataGridHyperlinkColumn IsReadOnly="True" Header="Uri" Binding="{Binding Path=NavigURI}" /> NavigURI is Uri . More recent docs seem to require a converter <DataGridHyperlinkColumn Header="Email" Binding="{Binding Email}" ContentBinding="{Binding Email, Converter={StaticResource EmailConverter}}" /> I tried with a converter also, but in both cases with or without converter column is empty. Debugging showed that value passed to "Convert" method is always null. My question : if for any reason I want binding to Uri property , is it feasible for the latest DataGrid from Codeplex ?

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• ASP.NET: Dynamically enable or disable RequiredFieldValidator based on value of DropDownList

  - by Jeremy

  I have an ASP.NET form with three text inputs, one each for "Work Phone", "Home Phone" and "Cell Phone". Each of these text inputs has a RequiredFieldValidator associated with it. I also have a DropDownList where the user can select the preferred phone type. I want to only require the field that is selected in the DropDownList. For example, if the user selects "Work Phone" from the DropDownList, I want to disable the RequiredFieldValidator for "Home Phone" and "Cell Phone", thereby only making the "Work Phone" field required. I have a method that enables and disables these validators based on the value of the DropDownList, but I cannot figure out when to call it. I want this method to run before the validation takes place on the page. How would I do that? Let me know if you need any more information. Thanks.

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• Error in PHP soap client to .NET soap Server

  - by Gabriel

  PHP soap client in attempting to interact with a .NET soap server results in the following error: [soap:Receiver] Server was unable to process request. --- Invalid length for a Base-64 char array. $credentials = array( 'RequestorUID'=> 'xxxx', 'RequestorPassword'=> 'xxxx' ); $param = array('pmPropertyManagerID'=>'xxxx'); $client->GetPropertyStatus($credentials, $param); GetPropertyStatus take two arguments, a credentials object - which works correctly as other functions that only require credentials are executed correctly. The second argument is defineds as a string and I have attempted to input it directly as a string and base64_encoded string (error: Length of the data to decrypt is invalid), an array and an associative array both string and base64_encoded string and get the error above. Any help would be appreciated.

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• ruby1.9.1 - sqlite3 problem on ubuntu 9.10 x64 (no such file to load -- sqlite3)

  - by doriath

  Hi, I have problem with sqlite3, because it is not working. irb(main):001:0> require 'sqlite3' LoadError: no such file to load -- sqlite3 from (irb):1:in `require' from (irb):1 from /usr/bin/irb:12:in `<main>' I have installed following packages: sudo apt-get install ruby1.9.1-full sudo apt-get install rubygems1.9.1 sudo gem update --system sudo apt-get install sqlite3 libsqlite3-dev sudo gem install sqlite3-ruby sudo apt-get install libopenssl-ruby1.9.1 The applications has following versions: $ ruby --version ruby 1.9.1p243 (2009-07-16 revision 24175) [x86_64-linux] $ sqlite3 --version 3.6.16 $ gem --version 1.3.6 and $ gem list --local *** LOCAL GEMS *** actionmailer (2.3.5) actionpack (2.3.5) activerecord (2.3.5) activeresource (2.3.5) activesupport (2.3.5) ffi (0.6.2) rack (1.0.1) rails (2.3.5) rake (0.8.7) rubygems-update (1.3.6) sqlite3-ruby (1.2.5) What have I missed?

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• What useful things could a javaScript library provide?

  - by Delan Azabani

  In many of my answers I repeatedly urge users not to use JavaScript libraries like jQuery. I even wrote a blog post about the problems that using a library create. Some of these problems include holding back native standards development, keeping users comfortably using IE, and abstracting the developer from real JavaScript. If a site doesn't require IE as part of its audience, then how are libraries useful? The other popular browsers share extremely similar implementations and work well with things like JavaScript 1.6 arrays and AJAX. This is not a troll question, I'm truly wondering what they're useful for.

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