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• Why do we use to talk about addresses and memory of variable in C?

  - by user2720323

  Why do we use to talk about addresses and memory of variable in C, where in other languages (like in Java, .Net etc) we do not talk about variable address and memory in a program, we will directly use the variables. But in C Language we are listening the word address and memory. How to explain this? I hope C is high level language designed over the assembly language. So C is a thin layer over assembly language (in assembly language we will use memory locations to store a variable and track a variable). But in other languages these addresses and memory related things are wrapped in that specific language, so that we will not listen these words.

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• Is there a 'design pattern' type listing of common algorithms?

  - by KevinM1

  Is there a 'design pattern' styled listing of common/popular algorithms anywhere? Specifically, something that has a similar format along the lines of: Algorithm Name: e.g., Quick Sort, Bubble Sort, etc. Problem: A description of the stereotypical problem the algorithm is supposed to address Description: Description of the solution Implementation: Code examples of the solution Big O Rating: Self-explanatory Similar Algorithms: Algorithms that address the same problem in different ways, or similar problems I really like the GoF design pattern listing style, and I think it would help me learn various algorithms better/easier if I could find a resource that was similar in terms of organization.

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• Fluent MVC Route Testing Helper

  - by Nettuce

  static class GetUrlFromController<T> where T : Controller     {         public static string WithAction(Expression<Func<T, ActionResult>> expression)         {             var controllerName = typeof(T).Name.Replace("Controller", string.Empty);             var methodCall = (MethodCallExpression)expression.Body;             var actionName = methodCall.Method.Name;             var routeValueDictionary = new RouteValueDictionary();             for (var i = 0; i < methodCall.Arguments.Count; i++)             {                 routeValueDictionary.Add(methodCall.Method.GetParameters()[i].Name, methodCall.Arguments[i]);             }             var routes = new RouteCollection();             MvcApplication.RegisterRoutes(routes);             return UrlHelper.GenerateUrl(null, actionName, controllerName, routeValueDictionary, routes, ContextMocks.RequestContext, true);         }     } I'm using FluentAssertions too, so you get this: GetUrlFromController<HomeController>.WithAction(x => x.Edit(1)).Should().Be("/Home/Edit/1");

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• Variable names for Contact Information bits

  - by RustyTheBoyRobot

  I am in the middle of refactoring code and would like to get some ideas on variable naming so that my new names clearly represent the data they hold. I have a class called ContactMethod which makes sense to me; each instance is a different way to contact someone. My problem comes when naming the properties of ContactMethod. For example, one instance might be a Fax number of 555-555-5555 while another could be an Email address of [email protected]; I've got a property called contactMethodType to hold the values "fax" or "email", but I don't know what to call the "555-555-5555" or "[email protected]" part. Has anyone here created a good generic name for this piece of contact information? (PS - the old convention was to call it a "Phone" with fields "phoneType" holding the "fax"/"email" value and "phoneId" holding the number/address. Yuck.)

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• Is there any complications or side effects for changing final field access/visibility modifier from private to protected?

  - by Software Engeneering Learner

  I have a private final field in one class and then I want to address that field in a subclass. I want to change field access/visibility modifier from private to protected, so I don't have to call getField() method from subclass and I can instead address that field directly (which is more clear and cohessive). Will there be any side effects or complications if I change private to protected for a final field? UPDATE: from logical point of view, it's obvious that descendant should be able to directly access all predecessor fields, right? But there are certain constraints that are imposed on private final fields by JVM, like 100% initialization guarantee after construction phase(useful for concurrency) and so on. So I would like to know, by changing from private to protected, won't that or any other constraints be compromised?

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• Two Java Update Releases

  - by Tori Wieldt

  Oracle has released two updates of Java, and strongly recommends that all users update. Java SE 7 Update 9 This releases address security concerns. Oracle strongly recommends that all Java SE 7 users upgrade to this release. JavaFX 2.2.3 is now bundled with the JDK on Windows, Mac and Linux x86/x64. Download Release Notes Java SE 6 Update 37 This releases address security concerns. Oracle strongly recommends that all Java SE 6 users upgrade to this release. Download Release Notes

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• My webcam stopped working, how do I fix it?

  - by Delilah

  I'm using Ubuntu 10.10 on a new Compaq Presario CQ56. The webcam was working fine for the first two days, in both Skype and Cheese, but simply turned black with thin vertical lines in the middle of a Skype call and now refuses to work in any program, including gstreamer-properties, Cheese, and VLC. It gives a black screen when rebooted into a live CD and tested. When tested, it either shows a plain black screen or black with thin vertical lines. Attached is an image of the video shown (it is static, there is no noise or static, and no response to variance in light). Also, when I play music or sounds, it makes a garbled noise related to the sound being played, which may or may not be connected to the webcam issue. If anyone has any ideas on what caused this, or whether it's a hardware or software issue, or how to fix it, I would appreciate them very much, Thanks

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• My cPanel login is being redirected. How can I resolve this?

  - by Suz

  I'm trying to get to cPanel to manage my website. When I type www.mydomain.com:2082 into the browser window, the request seems to be redirected. I made a screen-cast so I could slow down the changes in the address bar. First it seems to go to http://www.mydomain.com:2082/login then http://www.mydomain.com/cgi-sys/login.cgi At this point, a screen briefly appears which says 'Login attempt failed' and then the address is redirected to https://this22.thishost.com:2083/, which is no relation to my site at all. This looks to me like there has been an attack on the system and the login.cgi file is compromised. Any suggestions on how to analyze this further? or fix it? Of course my 'free hosting' isn't any help at all.

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• @Microsoft: please provide universal and professional concepts

  - by Marko Apfel

  Why such constructs are included in the csproj-Files? <CodeAnalysisRuleSetDirectories>;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\\Rule Sets</CodeAnalysisRuleSetDirectories> <CodeAnalysisRuleDirectories>;c:\Program Files (x86)\Microsoft Visual Studio 10.0\Team Tools\Static Analysis Tools\FxCop\\Rules</CodeAnalysisRuleDirectories> So it every projects needs some manual steps to clean the project file so the solution could be build on a continuous integration server. That annoying! And also in a Visual Studio mixed editions team that’s too specific for the ultimate edition. As good as Visual Studio in most cases is, sometimes it is really far away from professional coding fundamentals and best practices.

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• Is it possible to use a spherical collision component in UDK?

  - by Almo

  I have an object in UDK, which has a SkeletalMesh. At certain times in the game, I want this object to continue rendering the SkeletalMesh, but I'd like it to use spherical collision temporarily. After reading a bunch about PrimitiveComponents, my understanding is that UDK supports cylindrical and box-like collision, but not spherical without using a static mesh. But it seems an attached static mesh will render, since it has no bHidden attribute. There must be a way to do this, but I don't know UDK well enough yet to understand all the pitfalls.

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• Dynamic Strategy Pattern [migrated]

  - by Karl Barker

  So I'm writing a web service architecture which includes FunctionProvider classes which do the actual processing of requests, and a main Endpoint class which receives and delegates requests to the proper FunctionProvider. I don't know exactly the FunctionProviders available at runtime, so I need to be able to 'register' (if that's the right word) them with my main Endpoint class, and query them to see if they match an incoming request. public class MyFunc implements FunctionProvider{ static { MyEndpoint.register(MyFunc); } public Boolean matchesRequest(Request req){...} public void processRequest(Request req){...} } public class MyEndpoint{ private static ArrayList<FunctionProvider> functions = new ArrayList<FunctionProvider>(); public void register(Class clz){ functions.add(clz); } public void doPost(Request request){ //find the FunctionProvider in functions //matching the request } } I've really not done much reflective Java like this (and the above is likely wrong, but hopefully demonstrates my intentions). What's the nicest way to implement this without getting hacky?

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• Silverlight 4 Twitter Client &ndash; Part 5

  - by Max

  In this post, we will look at implementing the following in our twitter client - displaying the profile picture in the home page after logging in. So to accomplish this, we will need to do the following steps. 1) First of all, let us create another field in our Global variable static class to hold the profile image url. So just create a static string field in that. public static string profileImage { get; set; } 2) In the Login.xaml.cs file, before the line where we redirect to the Home page if the login was successful. Create another WebClient request to fetch details from this url - .xml">http://api.twitter.com/1/users/show/<TwitterUsername>.xml I am interested only in the “profile_image_url” node in this xml string returned. You can choose what ever field you need – the reference to the Twitter API Documentation is here. 3) This particular url does not require any authentication so no need of network credentials for this and also the useDefaultCredentials will be true. So this code would look like. WebRequest.RegisterPrefix("http://", System.Net.Browser.WebRequestCreator.ClientHttp); WebClient myService = new WebClient(); myService.AllowReadStreamBuffering = myService.UseDefaultCredentials = true; myService.DownloadStringCompleted += new DownloadStringCompletedEventHandler(TimelineRequestCompleted_User);) myService.DownloadStringAsync(new Uri("http://api.twitter.com/1/users/show/" + TwitterUsername.Text + ".xml")); 4) To parse the xml file returned by this and get the value of the “profile_image_url” node, the LINQ code will look something like XDocument xdoc; xdoc = XDocument.Parse(e.Result); var answer = (from status in xdoc.Descendants("user") select status.Element("profile_image_url").Value); GlobalVariable.profileImage = answer.First().ToString(); 5) After this, we can then redirect to Home page completing our login formalities. 6) In the home page, add a image tag and give it a name, something like <Image Name="image1" Stretch="Fill" Margin="29,29,0,0" Height="73" VerticalAlignment="Top" HorizontalAlignment="Left" Width="73" /> 7) In the OnNavigated to event in home page, we can set the image source url as below image1.Source = new BitmapImage(new Uri(GlobalVariable.profileImage, UriKind.Absolute)); Hope this helps. If you have any queries / suggestions, please feel free to comment below or contact me. Technorati Tags: Silverlight,LINQ,Twitter API,Twitter

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• Facebook to Look at Privacy Issues

  In perhaps the longest overdue move in recent memory, Facebook officials will convene to address mounting criticism about lax handling of privacy.

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• Facebook to Look at Privacy Issues

  In perhaps the longest overdue move in recent memory, Facebook officials will convene to address mounting criticism about lax handling of privacy.

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• How to access functions in extended classes efficiently?

  - by nischayn22

  In PHP I have classes as below class Animal { //some vars public function printname(){ echo $this->name; } } class AnimalMySql extends Animal { static public function getTableFields(){ return array(); } } class AnimalPostgreSql extends Animal { static public function getTableFields(){ return array(); } } Now I have an object $lion = new Animal(); and I want to do if($store == mysql) //getTableFields from class AnimalMySql else //getTableFields form class AnimalPostgreSql I am new to OOP and not sure what is the best way to call the method from the specific class P.S. Please leave a note with the answer to explain the efficiency of the approach

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• Configuring ethernet network

  - by den-javamaniac

  Hi. I've got a wired network connection and if I'm using network manager (hereafter "NM") everything works fine except for the hardware address (it doesn't change). I'm thinking of using /etc/network/interfaces. So, I added some code and it looks like this: auto lo iface lo inet loopback auto eth1 iface eth1 inet static address #corresponding value netmask #corresponding value gateway #corresponding value hwaddress #corresponding value After restarting networking I get the following message: *Reconfiguring network interfaces... #here some help code appears Failed to bring up eth1. The default interface that works with NM is eth0. Please advise on how to handle the problem.

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• Ideas to automate customer order processing? [on hold]

  - by user2753657

  i am looking for a way to automate the order processing in my webshop. Normally, a user buys a product in my webshop, then, i receive an order confirmation email with order details, address etc. After receiving the order email, I login to my suppliers website and input the order details manually. My supplier then ships the item to the address specified by me. I am looking for ideas how to automate this process, especially in the case if i receive for example 4-5 order emails at one time (and not one by one with several hours between)... I was looking at the program Winautomation, but i am not sure if this fits my needs. Any ideas are appreciated. thanks!

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• When do I bite the bullet and hire a developer? [closed]

  - by Paul Seattle

  I have an awesome URL, I've had it since the mid 90's, and up until around 2002 I was having an awesome time writing music reviews and features into static pages and adding their URL to static index pages and everything was just great. Then things got complicated really fast, and for one reason or another I handed the site over to a very talented friend who turned it into a db based site run by cf. Now, here I am around twelve years later putting it all back together using mysql, php and css on a need-to-learn basis and even though I'm sooo close to where I want it to be I realize, erm, it should have been written using mysqli etc etc ad infinitum. So I'm wondering at what point do I just give in and hire a developer to take over, how much does it even cost, and how do I know I'm working with someone who is better than I am?

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• How can I combine my FTP queries? [migrated]

  - by ryansworld10

  My program has several times where it queries an FTP server to read and upload information. How can I combine all these into one FTP class to handle everything? private static void UploadToFTP(string[] FTPSettings) { try { FtpWebRequest request = (FtpWebRequest)WebRequest.Create(FTPSettings[0]); request.Method = WebRequestMethods.Ftp.MakeDirectory; request.Credentials = new NetworkCredential(FTPSettings[1], FTPSettings[2]); FtpWebResponse response = (FtpWebResponse)request.GetResponse(); } catch { } try { FtpWebRequest request = (FtpWebRequest)WebRequest.Create(FTPSettings[0] + Path.GetFileName(file)); request.Method = WebRequestMethods.Ftp.UploadFile; request.Credentials = new NetworkCredential(FTPSettings[1], FTPSettings[2]); StreamReader source = new StreamReader(file); byte[] fileContents = Encoding.UTF8.GetBytes(source.ReadToEnd()); source.Close(); request.ContentLength = fileContents.Length; Stream requestStream = request.GetRequestStream(); requestStream.Write(fileContents, 0, fileContents.Length); requestStream.Close(); FtpWebResponse response = (FtpWebResponse)request.GetResponse(); response.Close(); RegenLog(); } catch (Exception e) { File.AppendAllText(file, string.Format("{0}{0}Upload Failed - ({2}) - {1}{0}", nl, System.DateTime.Now, e.Message.ToString())); } } private static void CheckBlacklist(string[] FTPSettings) { try { FtpWebRequest request = (FtpWebRequest)WebRequest.Create(FTPSettings[0] + "blacklist.txt"); request.Credentials = new NetworkCredential(FTPSettings[1], FTPSettings[2]); using (WebResponse response = request.GetResponse()) { using (Stream stream = response.GetResponseStream()) { using (TextReader reader = new StreamReader(stream)) { string blacklist = reader.ReadToEnd(); if (blacklist.Contains(Environment.UserName)) { File.AppendAllText(file, string.Format("{0}{0}Logger terminated - ({2}) - {1}{0}", nl, System.DateTime.Now, "Blacklisted")); uninstall = true; } } } } } catch (Exception e) { File.AppendAllText(file, string.Format("{0}{0}FTP Error - ({2}) - {1}{0}", nl, System.DateTime.Now, e.Message.ToString())); } } private static void CheckUpdate(string[] FTPSettings) { try { FtpWebRequest request = (FtpWebRequest)WebRequest.Create(FTPSettings[0] + "update.txt"); request.Credentials = new NetworkCredential(FTPSettings[1], FTPSettings[2]); using (WebResponse response = request.GetResponse()) { using (Stream stream = response.GetResponseStream()) { using (TextReader reader = new StreamReader(stream)) { string newVersion = reader.ReadToEnd(); if (newVersion != version) { update = true; } } } } } catch (Exception e) { File.AppendAllText(file, string.Format("{0}{0}FTP Error - ({2}) - {1}{0}", nl, System.DateTime.Now, e.Message.ToString())); } } I know my code is also a bit inconsistent and messy, however this is my first time working with FTP in C#. Please give any advice you have!

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• Is Google Analytics safe for websites that deal with sensitive information?

  - by guanome

  I work for a company that writes several webapps that deal with a lot of sensitive information, such as full name, date of birth, address, and SSNs. Currently we don't have anything to measure site usage, but I would like to use Google Analytics to track usage and statistics about our users. What data is sent to Google when you use Analytics? If I put this on a page that contains any of the above information, will that data be sent to Google? Or are they just getting the necessary information like user agent and IP address?

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• Good way to extract strings to resource

  - by Bart Friederichs

  I am using Visual Studio 2010 and we just decided to get started on localization of our code. We want to use the per-form resource file in combination with a separate resource file for static strings, called strings.resx. I was wondering if there is a good way to extra static strings (we already have quite some code we need to translate) to the strings.resx file? I have tried this plugin: Resource Refactoring 2010, but it doesn't work completely. It creates the correct new resource, but the strings aren't refactored in the code. Also, the tool seems to be abandoned by its developer. Is there a good plugin that can do this?

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• C# 5 - asynch method callback with Task.ContinueWIth? [migrated]

  - by user1142433

  I have a method that pulls some HTML via the HttpClient like so: public static HttpClient web = new HttpClient(); public static async Task<string> GetHTMLDataAsync(string url) { string responseBodyAsText = ""; try { HttpResponseMessage response = await web.GetAsync(url); response.EnsureSuccessStatusCode(); responseBodyAsText = await response.Content.ReadAsStringAsync(); } catch (Exception e) { // Error handling } return responseBodyAsText; } I have another method that looks like so: private void HtmlReadComplete(string data) { // do something with the data } I would like to be able to call GetHTMLDataAsync and then have it call HtmlReadComplete on the UI thread when the html has been read. I naively thought this could somehow be done with something that looks like GetHTMLDataAsync(url).ContinueWith(HtmlReadComplete); But, I can't get the syntax correct, nor am I even sure that's the appropriate way to handle it. Thanks in advance!

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• ASP.NET MVC Multilingual Web Application

  - by BobhatePradip

  We are going to see how we can show localized content to your ASP.NET MVC web application. We will see mainly two approaches- Approach 1: Using Static Pages We can go for this approach only when we have few/limited static localized pages. Approach 2: Using Dynamic page with localized data at runtime We should go for this approach if we have large number of pages to show a data in localized format. In this approach we can either use resource file or directly data from database.   For details about the this check this link http://www.codeproject.com/KB/aspnet/ASP_NET_MVC_Multilingual.aspx Here you can have code sample with explanation.

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• LWJGL: Camera distance from image plane?

  - by Rogem

  Let me paste some code before I ask the question... public static void createWindow(int[] args) { try { Display.setFullscreen(false); DisplayMode d[] = Display.getAvailableDisplayModes(); for (int i = 0; i < d.length; i++) { if (d[i].getWidth() == args[0] && d[i].getHeight() == args[1] && d[i].getBitsPerPixel() == 32) { displayMode = d[i]; break; } } Display.setDisplayMode(displayMode); Display.create(); } catch (Exception e) { e.printStackTrace(); System.exit(0); } } public static void initGL() { GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glShadeModel(GL11.GL_SMOOTH); GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); GL11.glClearDepth(1.0); GL11.glEnable(GL11.GL_DEPTH_TEST); GL11.glDepthFunc(GL11.GL_LEQUAL); GL11.glMatrixMode(GL11.GL_PROJECTION); GL11.glLoadIdentity(); GLU.gluPerspective(45.0f, (float) displayMode.getWidth() / (float) displayMode.getHeight(), 0.1f, 100.0f); GL11.glMatrixMode(GL11.GL_MODELVIEW); GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST); } So, with the camera and screen setup out of the way, I can now ask the actual question: How do I know what the camera distance is from the image plane? I also would like to know what the angle between the image plane's center normal and a line drawn from the middle of one of the edges to the camera position is. This will be used to consequently draw a vector from the camera's position through the player's click-coordinates to determine the world coordinates they clicked (or could've clicked). Also, when I set the camera coordinates, do I set the coordinates of the camera or do I set the coordinates of the image plane? Thank you for your help. EDIT: So, I managed to solve how to calculate the distance of the camera... Here's the relevant code... private static float getScreenFOV(int dim) { if (dim == 0) { float dist = (float) Math.tan((Math.PI / 2 - Math.toRadians(FOV_Y))/2) * 0.5f; float FOV_X = 2 * (float) Math.atan(getScreenRatio() * 0.5f / dist); return FOV_X; } else if (dim == 1) { return FOV_Y; } return 0; } FOV_Y is the Field of View that one defines in gluPerspective (float fovy in javadoc). This seems to be (and would logically be) for the height of the screen. Now I just need to figure out how to calculate that vector.

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• Getting wifi working on 14.04

  - by user286114

  I have installed Ubuntu 14.04 on my laptop. When I plug in the ethernet cable the internet works fine, but I can't see any wireless network in the networking manager. The wifi switch is definitely on on my laptop! It's a Dell XPS M1330. I'm not sure what the network card is - how can I find out? nm-tool gives me this: NetworkManager Tool State: connected (global) - Device: eth0 [Wired connection 1] ------------------------------------------- Type: Wired Driver: tg3 State: connected Default: yes HW Address: 00:23:AE:28:FE:A2 Capabilities: Carrier Detect: yes Speed: 100 Mb/s Wired Properties Carrier: on IPv4 Settings: Address: 192.168.1.26 Prefix: 24 (255.255.255.0) Gateway: 192.168.1.254 DNS: 192.168.1.254

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