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  • How often to authenticate iOS app in web service

    - by jeraldov
    I am trying to build an iOS app that connects to a PHP+MySQL web service. My question is how often should I check for user's authentication to get data from the web service. My app requires a login at start up, but I am wondering if how often should I check if he can still validly get data from the web service. Should I check for his username and password each time the user views a table view that get its data from the web service?

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  • Developing an analytics's system processing large amounts of data - where to start

    - by Ryan
    Imagine you're writing some sort of Web Analytics system - you're recording raw page hits along with some extra things like tagging cookies etc and then producing stats such as Which pages got most traffic over a time period Which referers sent most traffic Goals completed (goal being a view of a particular page) And more advanced things like which referers sent the most number of vistors who later hit a goal. The naieve way of approaching this would be to throw it in a relational database and run queries over it - but that won't scale. You could pre-calculate everything (have a queue of incoming 'hits' and use to update report tables) - but what if you later change a goal - how could you efficiently re-calculate just the data that would be effected. Obviously this has been done before ;) so any tips on where to start, methods & examples, architecture, technologies etc.

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  • Java Cryptography Extension

    - by Adam Tannon
    I was told that in order to support AES256 encryption inside my Java app that I would need the JCE with Unlimited Strength Jurisdiction Policy Files. I downloaded this from Oracle and unzipped it and I'm only seeing 2 JARs: local_policy.jar; and US_export_polic.jar I just want to confirm I'm not missing anything here! My understanding (after reading the README.txt) is that I just drop these two into my <JAVA_HOME>/lib/security/ directory and they should be installed. By the names of these JARs I have to assume that its not the Java Crypto API that cannot handle AES256, but it's in fact a legal issue, perhaps? And that these two JARs basically tell the JRE "yes, it's legally-acceptable to run this level of crypto (AES256)." Am I correct or off-base?

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  • Linking Libraries in iOS?

    - by Joey Green
    This is probably a totally noob question but I have missing links in my mind when thinking about linking libraries in iOS. I usually just add a new library that's been cross compiled and set the build and linker paths without really know what I'm doing. I'm hoping someone can help me fill in some gaps. Let's take the OpenCV library for instance. I have this totally working btw because of a really well written tutorial( http://niw.at/articles/2009/03/14/using-opencv-on-iphone/en ), but I'm just wanting to know what is exactly going on. What I'm thinking is happening is that when I build OpenCV for iOS is that your creating object code that gets placed in the .a files. This object code is just the implementation files( .m ) compiled. One reason you would want to do this is to make it hard to see the source code and so that you don't have to compile that source code every time. The .h files won't be put in the library ( .a ). You include the .h in your source files and these header files communicate with the object code library ( .a ) in some way. You also have to include the header files for your library in the Build Path and the Library itself in the Linker Path. So, is the way I view linking libraries correct? If , not can someone correct me on this ?

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  • How common is it to submit papers to journals or conferences outside of academia?

    - by Furry
    I worked in academia a few years, but more on the D-side of R&D. The race for papers never appealed to me and I'm a practical not theoretical type, but I do like reading papers on certain topics (e.g. Google Papers, NLP, FB papers, ...) a lot. How common is it that normally working developers submit papers to conferences or even journals? It seems to be somewhat common in certain companies (it's not common or encouraged in mine). Do journals or conferences even take papers by an academic nobody (BSc) under consideration? I ask, because I have a few rough ideas and I would just like to bring them into form, one way or the other. Bonus question: Is there a list of CS (in the widest sense) conferences/journals with short descriptions? PS (Four out of five researchers I met published quite some fluffy stuff for my taste. I am no expert, but those people told me sometimes themselves, that the implementation does not matter, just the idea and the presentation. I always wondered about that. I probably could write about ideas all day long (not instantly but with a bit of preparation), but the implementation and the practical part is the really hard part, that academia just does not like to be concerned with. Also many papers actually scream: I was written so the publication list of my author gets longer - which is a waste of time for everyone, and often a waste of tax money, too. When I think of CS-ish papers, I think of running implementations or actual data, like e.g. Google's Map Reduce, Serving Large-scale Batch Computed Data with Project Voldemort or the like.)

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  • Why a static main method in Java and C#, rather than a constructor?

    - by Konrad Rudolph
    Why did (notably) Java and C# decide to have a static method as their entry point – rather than representing an application instance by an instance of an Application class, with the entry point being an appropriate constructor which, at least to me, seems more natural? I’m interested in a definitive answer from a primary or secondary source, not mere speculations. This has been asked before. Unfortunately, the existing answers are merely begging the question. In particular, the following answers don’t satisfy me, as I deem them incorrect: There would be ambiguity if the constructor were overloaded. – In fact, C# (as well as C and C++) allows different signatures for Main so the same potential ambiguity exists, and is dealt with. A static method means no objects can be instantiated before so order of initialisation is clear. – This is just factually wrong, some objects are instantiated before (e.g. in a static constructor). So they can be invoked by the runtime without having to instantiate a parent object. – This is no answer at all. Just to justify further why I think this is a valid and interesting question: Many frameworks do use classes to represent applications, and constructors as entry points. For instance, the VB.NET application framework uses a dedicated main dialog (and its constructor) as the entry point1. Neither Java nor C# technically need a main method. Well, C# needs one to compile, but Java not even that. And in neither case is it needed for execution. So this doesn’t appear to be a technical restriction. And, as I mentioned in the first paragraph, for a mere convention it seems oddly unfitting with the general design principle of Java and C#. To be clear, there isn’t a specific disadvantage to having a static main method, it’s just distinctly odd, which made me wonder if there was some technical rationale behind it. I’m interested in a definitive answer from a primary or secondary source, not mere speculations. 1 Although there is a callback (Startup) which may intercept this.

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  • SQL Query Builder/Designer and code Formating

    - by DavRob60
    I write SQL query every now and then, I could easily write them freehand, but sometimes I do create SQL queries using SQL Query Designers for various reason. (I wont start to enumerate them here and/or argue about their usefulness, so let's just say they are sometime useful.) Anyway, I currently use 2 Query Designers : SQL server management studio's Query Designer. Visual Studio 2010's Query Builder (must often within the Table adapter Query Configuration Wizard.) There's something I hate about those two (I don't know about the others), it's the way they throw away my Code formatting of SQL queries after an edit. Is there any way to configure something to automatically reformat the SQL output or is there any external tool/plug-in that I could use to do that job?

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  • What do you think of the following job specification?

    - by m.edmondson
    Just received this out of the blue from a recruiter - a number of things stand out to me: PERSON PROFILE Hard working - with a stay until the job in done mentality Thrive on the pressure of tight weekly development deadlines Good attention to detail to ensure bug free development Ability to test all development work from user's perpective Ability to think like a user as well as a developer Good communication skills to understand new funcationality and bugs Flexibility to contribute outside main responsbilities when needed. BENEFITS Salary dependant on skills Contributary Pension with 4% contribution from employer (after 1 year of service) Private Healthcase (after 1 year of service) 20 days holiday + 3-4 days holiday between Christmas and New year - 1 day extra holiday available each quarter you don't have a day off sick (and an additional day if you are not off sick for the whole year ). Would you want to work here? From what I can see they want a work-a-holic who will crawl out of his death bed in order to not lose holiday entitlement.

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  • IValidatableObject vs Single Responsibility

    - by Boris Yankov
    I like the extnesibility point of MVC, allowing view models to implement IValidatableObject, and add custom validation. I try to keep my Controllers lean, having this code be the only validation logic: if (!ModelState.IsValid) return View(loginViewModel); For example a login view model implements IValidatableObject, gets ILoginValidator object via constructor injection: public interface ILoginValidator { bool UserExists(string email); bool IsLoginValid(string userName, string password); } It seems that Ninject, injecting instances in view models isn't really a common practice, may be even an anti-pattern? Is this a good approach? Is there a better one?

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  • Is it necessary to create a database with as few tables as possible

    - by Shaheer
    Should we create a database structure with a minimum number of tables? Should it be designed in a way that everything stays in one place or is it okay to have more tables? Will it in anyway affect anything? I am asking this question because a friend of mine modified some database structure in mediaWiki. In the end, instead of 20 tables he was using only 8, and it took him 8 months to do that (it was his college assignment). EDIT I am concluding the answer as: size of the tables does NOT matter, until the case is exceptional; in which case the denormalization may help. Thanks to everyone for the answers.

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  • How much PHP do I need to know to use AJAX?

    - by user1146440
    Hi I am interested in learning to create AJAX calls with Javascript.I already know Javascript and I would like to learn PHP at some point but at the moment I know nothing about it and I don't have the time to learn the full language. How much PHP do I need to know to be able to do AJAX calls? Can someone recommend me some good resources to get familiar with what I need to learn from PHP so I can learn AJAX.I am planing on starting to read AJAX and PHP: Building Modern Web Applications 2nd Edition but I think I need to know some basic PHP.

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  • Implementing MVC pattern in SWT application

    - by Pradeep Simha
    I am developing an SWT application (it's basically an Eclipse plugin, so I need to use SWT). Currently my design is as follows: Model: In model, I have POJOs which represents the actual fields in views. View: It is a dumb layer, it contains just UI and contains no logic (not even event handlers) Controller: It acts as a mediator b/w those two layers. Also it is responsible for creating view layer, handling events etc. Basically I have created all of the controls in view as a static like this public static Button btnLogin and in controller I have a code like this: public void createLoginView(Composite comp) { LoginFormView.createView(comp); //This createView method is in view layer ie LoginFormView LoginFormView.btnLogin.addSelectionListener(new SelectionListener() { //Code goes here }); } Similalrly I have done for other views and controls. So that in main class and other classes I am calling just createLoginView of controller. I am doing similar thing for other views. So my question, is what I am doing is correct? Is this design good? Or I should have followed any other approach. Since I am new to SWT and Eclipse plugin development (basically I am Java EE developer having 4+ years of exp). Any tips/pointers would be appreciated.

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  • Microsoft Terminology: .NET C++ vs. traditional C++

    - by Mike Clark
    I've recently been working with a team that's using both .NET C++ and pre-.NET C++. I fully understand the technical differences between the two technologies. However, I sometimes feel like I'm floundering when it comes to the terminology used to differentiate the two. Example: Say we have two projects: ProjectA contains "C++" code that builds a .NET assembly DLL. ProjectB contains Visual C++ code that builds a traditional native Windows DLL. What is the best way to succinctly and terminologically draw a distinction between the two projects? Again, I'm not asking for an in-depth technical description of the differences between the two technologies. I'm just looking for names and labels. This is how, today, I might try to make the distinction when talking to someone: "ProjectA is a managed .NET C++ project" and "ProjectB is an unmanaged native C++ DLL project." However I am not at all certain that this terminology is ideal, or even correct. Please describe what you feel the ideal language to use in this situation (or similar situations) might be. Feel free to motivate your answer.

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  • Should I reuse variables?

    - by IAdapter
    Should I reuse variables? I know that many best practice say you should not do it, however later when different developer is debugging the code and have 3 variables that look a like and only difference is that they are created in different places in the code he might be confused. unit-testing is a great example of this. However I do know that best practice are most of the time against it. For example they say not to "overide" method parameters. Best practice are even are against nulling the previous variables (in Java there is Sonar that has warning when you assign null to variable that you don't need to do it to call garbage collector since Java6. you cant always control what warnings are turned off, most of the time the default is on)

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  • JQuery + WCF + HTTP 404 Error

    - by hangar18
    HI All, I've searched high and low and finally decided to post a query here. I'm writing a very basic HTML page from which I'm trying to call a WCF service using jQuery and parse it using JSON. Service: IMyDemo.cs [ServiceContract] public interface IMyDemo { [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json)] Employee DoWork(); [OperationContract] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json)] Employee GetEmp(int age, string name); } [DataContract] public class Employee { [DataMember] public int EmpId { get; set; } [DataMember] public string EmpName { get; set; } [DataMember] public int EmpSalary { get; set; } } MyDemo.svc.cs public Employee DoWork() { // Add your operation implementation here Employee obj = new Employee() { EmpSalary = 12, EmpName = "SomeName" }; return obj; } public Employee GetEmp(int age, string name) { Employee emp = new Employee(); if (age > 0) emp.EmpSalary = 12 + age; if (!string.IsNullOrEmpty(name)) emp.EmpName = "Server" + name; return emp; } WEb.Config <system.serviceModel> <services> <service behaviorConfiguration="EmployeesBehavior" name="MySample.MyDemo"> <endpoint address="" binding="webHttpBinding" contract="MySample.IMyDemo" behaviorConfiguration="EmployeesBehavior"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="EmployeesBehavior"> <serviceMetadata httpGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="true" /> </behavior> </serviceBehaviors> <endpointBehaviors> <behavior name="EmployeesBehavior"> <webHttp/> </behavior> </endpointBehaviors> </behaviors> <serviceHostingEnvironment multipleSiteBindingsEnabled="true" /> </system.serviceModel> MyDemo.htm <head> <title></title> <script type="text/javascript" language="javascript" src="Scripts/jquery-1.4.1.js"></script> <script type="text/javascript" language="javascript" src="Scripts/json.js"></script> <script type="text/javascript"> //create a global javascript object for the AJAX defaults. debugger; var ajaxDefaults = {}; ajaxDefaults.base = { type: "POST", timeout : 1000, dataFilter: function (data) { //see http://encosia.com/2009/06/29/never-worry-about-asp-net-ajaxs-d-again/ data = JSON.parse(data); //use the JSON2 library if you aren’t using FF3+, IE8, Safari 3/Google Chrome return data.hasOwnProperty("d") ? data.d : data; }, error: function (xhr) { //see if (!xhr) return; if (xhr.responseText) { var response = JSON.parse(xhr.responseText); //console.log works in FF + Firebug only, replace this code if (response) alert(response); else alert("Unknown server error"); } } }; ajaxDefaults.json = $.extend(ajaxDefaults.base, { //see http://encosia.com/2008/03/27/using-jquery-to-consume-aspnet-json-web-services/ contentType: "application/json; charset=utf-8", dataType: "json" }); var ops = { baseUrl: "/MyService/MySample/MyDemo.svc/", doWork: function () { //see http://api.jquery.com/jQuery.extend/ var ajaxOptions = $.extend(ajaxDefaults.json, { url: ops.baseUrl + "DoWork", data: "{}", success: function (msg) { console.log("success"); console.log(typeof msg); if (typeof msg !== "undefined") { console.log(msg); } } }); $.ajax(ajaxOptions); return false; }, getEmp: function () { var ajaxOpts = $.extend(ajaxDefaults.json, { url: ops.baseUrl + "GetEmp", data: JSON.stringify({ age: 12, name: "NameName" }), success: function (msg) { $("span#lbl").html("age: " + msg.Age + "name:" + msg.Name); } }); $.ajax(ajaxOpts); return false; } } </script> </head> <body> <span id="lbl">abc</span> <br /><br /> <input type="button" value="GetEmployee" id="btnGetEmployee" onclick="javascript:ops.getEmp();" /> </body> I'm just not able to get this running. When I debug, I see the error being returned from the call is " Server Error in '/jQuerySample' Application. <h2> <i>HTTP Error 404 - Not Found.</i> </h2></span> " Looks like I'm missing something basic here. My sample is based on this I've been trying to fix the code for sometime now so I'd like you to take a look and see if you can figure out what is it that I'm doing wrong here. I'm able to see that the service is created when I browse the service in IE. I've also tried changing the setting as mentioned here Appreciate your help. I'm gonna blog about this as soon as the issue is resolved for the benefit of other devs Thanks -Soni

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  • Is using something other than XML advisable for my configuration file?

    - by Earlz
    I have a small tool I'm designing which would require a configuration file of some sort. The configuration file in my case is really more of a database, but it needs to be lightweight, and if needed the end-user should find it easily editable. However, it also will contain a lot of things in it. (depending on certain factors, could be 1Mb or more) I've decided I'd rather use plain ol' text, rather than trying to use SQLite or some such. However, with using text, I also have to deal with the variety of formats. So far, my options are XML JSON Custom format The data in my file is quite simple consisting for the most part of key-value type things. So, a custom format wouldn't be that difficult... but I'd rather not have to worry about writing the support for it. I've never seen JSON used for configuration files. And XML would bloat the file size substantially I think. (I also just has a dislike of XML in general). What should I do in this case? Factors to consider: This configuration file can be uploaded to a web service(so size matters) Users must be able to edit it by hand if necessary(ease of editing and reading matters) Must be able to generate and process automatically (speed doesn't matter a lot, but not excessively slow) The "keys" and "values" are plain strings, but must be escaped because they can contain anything. (unicode and escaping has to work easily)

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  • Hiring a Junior Developer, What should I ask?

    - by Jeremy
    We are currently hiring a junior developer to help me out, as I have more projects than I can currently manage. I have never hired anyone who wasn't a friend or at least an acquaintance. I have a phone interview with the only applicant that actually stood out to me (on paper), but I have never done this before. Our projects are all high scalability, data intensive web applications that process millions of transactions an hour, across multiple servers and clients. To be language/stack specific, we use ASP.Net MVC2, WebForms and C# 4, MSSQL 2008 R2, all running atop Windows Server 2008 R2 What should I ask him? How should I structure the phone call?

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  • How to make a system time-zone sensitive?

    - by Jerry Dodge
    I need to implement time zones in a very large and old Delphi system, where there's a central SQL Server database and possibly hundreds of client installations around the world in different time zones. The application already interacts with the database by only using the date/time of the database server. So, all the time stamps saved in both the database and on the client machines are the date/time of the database server when it happened, never the time of the client machine. So, when a client is about to display the date/time of something (such as a transaction) which is coming from this database, it needs to show the date/time converted to the local time zone. This is where I get lost. I would naturally assume there should be something in SQL to recognize the time zone and convert a DateTime field dynamically. I'm not sure if such a thing exists though. If so, that would be perfect, but if not, I need to figure out another way. This Delphi system (multiple projects) utilizes the SQL Server database using ADO components, VCL data-aware controls, and QuickReports (using data sources). So, there's many places where the data goes directly from the database query to rendering on the screen, without any code to actually put this data on the screen. In the end, I need to know when and how should I get the properly converted time? There must be a standard method for this, and I'm hoping SQL Server 2008 R2 has this covered...

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  • Trying to learn how to use WCF services in a WPF app, using MVVM

    - by Rod
    We're working on a major re-write of a legacy VB6 app, into a WPF app. I've written several WCF services, which are meant to be used with the new WPF app. We want to use the MVVM design pattern to do this, but we don't have experience at that. So, in order to learn MVVM we've watched a video on WindowsClient called How Do I: Build Data-driven WPF Application using the MVVM pattern. This is a great introduction, and we refer to it a lot, but for our situation it doesn't quite give us enough. For example, we're not certain how to use datasets returned by my WCF services in our new WPF app using the ideas that Todd Miranda introduced in the video I referenced. If we did as we think we're supposed to do, then we should design a class that is exactly like the class of data returned in my WCF service. But we're wondering, why do that, when the WCF service already has such a class? And yet, the class in the WPF app has to at least implement the INotifyPropertyChanged interface. So, we're not sure what to do.

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  • Why is Adobe Air so underrated for building mobile apps?

    - by Marcelo de Assis
    I worked with Adobe Flash related technologies for the last 5 years, although not being a big fan of Adobe. I see some little bugs happening in some apps, but I cannot imagine why a lot of big companies do not even think to use use Adobe Air as a good technology for their mobile apps. I see a lot of mobile developer positions asking for experts in Android or iOS , but very much less positions asking for Adobe Air, even when Adobe Air apps have the advantage of being multi-plataform, with the same app working in Blackberry, iOS and Android. Is so much easier to develop a game using Flash, than using Android SDK, for example. It really have flaws (that I never saw) or it is just some kind of mass prejudgement? I also would like to hear what a project manager or a indie developer takes when choosing a plataform for building apps.

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  • What do you do before you start programming?

    - by SterAllures
    Heya, I'm not sure this question belongs here, it's not so much I problem I'm having with programming but rather a problem of what to do before I start programming. I want a visual representation of what variables I need and what classes have what methods.I know there is UML but I'm not sure if that is the best way, so what do you guys use before you start programming, which method? I don't want to start a flamewar about what is better just what are several approaches?

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  • Resources needed: basics of using make/qmake

    - by Mikey
    I am look for a good book or website that clearly explains the basics of using make, (particularly qmake for Qt development) makefiles, etc. for building C++/Qt executables. I am using open source tools on Ubuntu. Lately have been doing a lot of Qt/C++ development using the CodeLite IDE, which works quite well with Qt, however when I wanted to write my own QObject derivatives with custom signal and slots, I discovered I had to use qmake and I don't know how. (Meanwhile I have been using QtCreator, which handles this, but it not my IDE of choice) I have several books on C++ and Qt but I haven't found that they focus at all on this area. Recommendations please...

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  • Where does this concept of "favor composition over inheritance" come from?

    - by Mason Wheeler
    In the last few months, the mantra "favor composition over inheritance" seems to have sprung up out of nowhere and become almost some sort of meme within the programming community. And every time I see it, I'm a little bit mystified. It's like someone said "favor drills over hammers." In my experience, composition and inheritance are two different tools with different use cases, and treating them as if they were interchangeable and one was inherently superior to the other makes no sense. Also, I never see a real explanation for why inheritance is bad and composition is good, which just makes me more suspicious. Is it supposed to just be accepted on faith? Liskov substitution and polymorphism have well-known, clear-cut benefits, and IMO comprise the entire point of using object-oriented programming, and no one ever explains why they should be discarded in favor of composition. Does anyone know where this concept comes from, and what the rationale behind it is?

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  • Keeping an enum and a table in sync

    - by MPelletier
    I'm making a program that will post data to a database, and I've run into a pattern that I'm sure is familiar: A short table of most-likely (very strongly likely) fixed values that serve as an enum. So suppose the following table called Status: Status Id Description -------------- 0 Unprocessed 1 Pending 2 Processed 3 Error In my program I need to determine a status Id for another table, or possibly update a record with a new status Id. I could hardcode the status Id's in an enum and hope no one ever changes the database. Or I could pre-fetch the values based on the description (thus hardcoding that instead). What would be the correct approach to keep these two, enum and table, synced?

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  • How do you differentiate between "box," "machine," "computer" and whatever else?

    - by Corey
    There seems to be a few terms for referring to a computer, especially in the tech world. Different terms seem to be used based on technical expertise. When talking with people with some technical knowledge, I'll refer to it as a machine. When talking to non-technical people (family, friends) I'll call it a computer. On the rare occasion I'm talking about servers, I might call it a box, but even then I'll probably still call it a machine. Is that just me, or do there exist rules already for what to call a computer?

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