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  • How do I hide an inherited __published property in the derived class in a VCL component?

    - by Gary Benade
    I have created a new VCL component based on an existing VCL component. What I want to do now is set the Password and Username properties from an ini file instead of the property inspector. Robert Dunn Link I read on the delphi forum above you cannot unpublish a property and that the only workaround is to redeclare the property as read-only. I tried this but it all it does is make the property read only and grayed out in the object inspector. While this could work I would prefer if the property wasn't visible at all. __property System::UnicodeString Password = {read=FPassword}; Thanks in advance for any help or links to c++ VCL component writing tutorials. I am using CB2010

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  • LazyList<T> vs System.Lazy<List<T>> in ASP.NET MVC 2?

    - by FreshCode
    In Rob Conery's Storefront series, Rob makes extensive use of the LazyList<..> construct to pull data from IQueryables. How does this differ from the System.Lazy<...> construct now available in .NET 4.0 (and perhaps earlier)? More depth based on DoctaJones' great answer: Would you recommend one over the other if I wanted to operate on IQueryable as a List<T>? I'm assuming that since Lazy<T> is in the framework now, it is a safer bet for future support and maintainability? If I want to use a strong type instead of an anonymous (var) type would the following statements be functionally equivalent? Lazy<List<Products>> Products = new Lazy<List<Product>>(); LazyList<Product> = new LazyList<Product>();

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  • How do I 'addChild' an DisplayObject3d from another class? (Papervision3d)

    - by Sandor
    Hi All Im kind of new in the whole papervision scene. For a school assignment I'm making a panorama version of my own room using a cube with 6 pictures in it. It created the panorama, it works great. But now I want to add clickable objects in it. One of the requirements is that my code is OOP focused. So that's what I am trying right now. Currently I got two classes - Main.as (Here i make the panorama cube as the room) - photoWall.as (Here I want to create my first clickable object) Now my problem is: I want to addChild a clickable object from photoWall.as to my panorama room. But he doesn't show it? I think it has something to do with the scenes. I use a new scene in Main.as and in photoWall.as. No errors or warnings are reported This is the piece in photoWall.as were I want to addChild my object (photoList): private function portret():void { //defining my material for the clickable portret var material : BitmapFileMaterial = new BitmapFileMaterial('images/room.jpg'); var material_list : MaterialsList = new MaterialsList( { front: material, back: material } ); // I don't know if this is nessecary? that's my problem scene = new Scene3D(); material.interactive = true; // make the clickable object as a cube var photoList : DisplayObject3D = new Cube(material_list, 1400, 1400, 1750, 1, 4, 4, 4); // positioning photoList.x = -1400; photoList.y = -280; photoList.z = 5000; //mouse event photoList.addEventListener( InteractiveScene3DEvent.OBJECT_CLICK, onPress); // this is my problem! I cannot see 'photoList' within my scene!!! scene.addChild(photoList); // trace works, so the function must be loaded. trace('function loaded'); } Hope you guys can help me out here. Would really be great! Thanks, Sandor

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  • Ruby on Rails: Model.all.each vs find_by_sql("SELECT * FROM model").each ?

    - by B_
    I'm fairly new to RoR. In my controller, I'm iterating over every tuple in the database. For every table, for every column I used to call SomeOtherModel.find_by_sql("SELECT column FROM model").each {|x| #etc } which worked fine enough. When I later changed this to Model.all(:select => "column").each {|x| #etc } the loop starts out at roughly the same speed but quickly slows down to something like 100 times slower than the the find_by_sql command. These calls should be identical so I really don't know what's happening. I know these calls are not the most efficient but this is just an intermediate step and I will optimize it more once this works correctly. Thanks!

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  • delayed evaluation of code in subroutines - 5.8 vs. 5.10 and 5.12

    - by Brock
    This bit of code behaves differently under perl 5.8 than it does under perl 5.12: my $badcode = sub { 1 / 0 }; print "Made it past the bad code.\n"; [brock@chase tmp]$ /usr/bin/perl -v This is perl, v5.8.8 built for i486-linux-gnu-thread-multi [brock@chase tmp]$ /usr/bin/perl badcode.pl Illegal division by zero at badcode.pl line 1. [brock@chase tmp]$ /usr/local/bin/perl -v This is perl 5, version 12, subversion 0 (v5.12.0) built for i686-linux [brock@chase tmp]$ /usr/local/bin/perl badcode.pl Made it past the bad code. Under perl 5.10.1, it behaves as it does under 5.12: brock@laptop:/var/tmp$ perl -v This is perl, v5.10.1 (*) built for i486-linux-gnu-thread-multi brock@laptop:/var/tmp$ perl badcode.pl Made it past the bad code. I get the same results with a named subroutine, e.g. sub badcode { 1 / 0 } I don't see anything about this in the perl5100delta pod. Is this an undocumented change? A unintended side effect of some other change? (For the record, I think 5.10 and 5.12 are doing the Right Thing.)

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  • C++ .NET DLL vs C# Managed Code ? (File Encrypting AES-128+XTS)

    - by Ranhiru
    I need to create a Windows Mobile Application (WinMo 6.x - C#) which is used to encrypt/decrypt files. However it is my duty to write the encryption algorithm which is AES-128 along with XTS as the mode of operation. RijndaelManaged just doesn't cut it :( Very much slower than DES and 3DES CryptoServiceProviders :O I know it all depends on how good I am at writing the algorithm in the most efficient way. (And yes I my self have to write it from scratch but i can take a look @ other implementations) Nevertheless, does writing a C++ .NET DLL to create the encryption/decryption algorithm + all the file handling and using it from C# have a significant performance advantage OVER writing the encryption algorithm + file handling in completely managed C# code? If I use C++ .NET to create the encryption algorithm, should I use MFC Smart Device DLL or ATL? What is the difference and is there any impact on which one I choose? And can i just add a reference to the C++ DLL from C# or should I use P/Invoke? I am fairly competent with C# than C++ but performance plays a major role as I have convinced my lecturers that AES is a very efficient cryptographic algorithm for resource constrained devices. Thanx a bunch :)

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  • No compile errors when reference added, but errors seen upon build

    - by cjs
    A solution was just converted from VS 2008 to VS 2010. My VS 2010 build is failing with the popular "The type or namespace X could not be found". When I go to the project and go to Add References and add the appropriate project dll, the class name appears in blue text as if .NET found the correct class. However, when I go to the Build menu and select "Build Solution" I get the "namespace not found error" and the class name is no longer blue. Thanks.

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  • Entity Framework in n-layered application - Lazy loading vs. Eager loading patterns

    - by Marconline
    Hi all. This questions doesn't let me sleep as it's since one year I'm trying to find a solution but... still nothing happened in my mind. Probably you can help me, because I think this is a very common issue. I've a n-layered application: presentation layer, business logic layer, model layer. Suppose for simplicity that my application contains, in the presentation layer, a form that allows a user to search for a customer. Now the user fills the filters through the UI and clicks a button. Something happens and the request arrives to presentation layer to a method like CustomerSearch(CustomerFilter myFilter). This business logic layer now keeps it simple: creates a query on the model and gets back results. Now the question: how do you face the problem of loading data? I mean business logic layer doesn't know that that particular method will be invoked just by that form. So I think that it doesn't know if the requesting form needs just the Customer objects back or the Customer objects with the linked Order entities. I try to explain better: our form just wants to list Customers searching by surname. It has nothing to do with orders. So the business logic query will be something like: (from c in ctx.CustomerSet where c.Name.Contains(strQry) select c).ToList(); now this is working correctly. Two days later your boss asks you to add a form that let you search for customers like the other and you need to show the total count of orders created by each customer. Now I'd like to reuse that query and add the piece of logic that attach (includes) orders and gets back that. How would you front this request? Here is the best (I think) idea I had since now. I'd like to hear from you: my CustomerSearch method in BLL doesn't create the query directly but passes through private extension methods that compose the ObjectQuery like: private ObjectQuery<Customer> SearchCustomers(this ObjectQuery<Customer> qry, CustomerFilter myFilter) and private ObjectQuery<Customer> IncludeOrders(this ObjectQuery<Customer> qry) but this doesn't convince me as it seems too complex. Thanks, Marco

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  • QtCreator on linux: 32-bits vs. 64-bits.

    - by Claire Huang
    My laptop is 64-bits, so when I start to use Qt, I chose 64-bit QtCreator. Now I'm facing a problem, I wish that the executable files I generated are runnnable on 32-bit linux system. Can I set QtCreator to generate 32-bit executable files? So that I can decide I want to generate 32-bit ones or 64-bit ones. I don't want to install another 32-bit QtCreator <.

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  • Is it possible to generate dynamic proxy for static class or static method in C#?

    - by Jeffrey
    I am trying to come up with a way that (either static or instance) method calls can be intercepted by dynamic proxy. I want to implement it as c# extension methods but stuck on how to generate dynamic proxy for static methods. Some usages: Repository.GetAll<T>().CacheForMinutes(10); Repository.GetAll<T>().LogWhenErrorOccurs(); //or var repo = new Repository(); repo.GetAll<T>().CacheForMinutes(10); repo.GetAll<T>().LogWhenErrorOccurs(); I am open to any library (linfu, castle.dynamic proxy 2 or etc). Thanks!

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  • How can I stop an auto-generated Linq to SQL class from loading ALL data?

    - by Gary McGill
    I have an ASP.NET MVC project, much like the NerdDinner tutorial example. (I'm using MVC 2, but followed the NerdDinner tutorial in order to create it). As per the instructions in part 3 of the tutorial, I've created a Linq-to-SQL model of my database by creating a "Linq to SQL Classes" (.dbml) surface, and dropping my database tables onto it. The designer has automatically added relationships between the generated classes based on my database tables. Let's say that my classes are as per the NerdDinner example, so I have Dinner and RSVP tables, where each Dinner record is associated with many RSVP records - hence in the generated classes, the Dinner object has a RSVPs property which is a list of RSVP objects. My problem is this: it appears (and I'd be gladly proved wrong on this) that as soon as I access a Dinner object, it's loading all of the corresponding RSVP objects, even if I don't use the RSVPs member. First question: is this really the default behavior for the generated classes? In my particular situation, the object graph contains many more tables (which have an order of magnitude more records), and so this is disastrous behaviour - I'd be loading tons of data when all I want to do is show the details of a single parent record. Second question: are there any properties exposed through the designer UI that would let me modify this behavior? (I can't find any). Third question: I've seen a description of how to control the loading of related records in a DataContext by using a DataShape object associated with the DataContext. Is that what I'm meant to do, and if so are there any tutorials like the NerdDinner one that would show not only how to do it, but also suggest a 'pattern' for normal use?

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  • Master's in Software Engineering vs. Master's in Computer Science: which degree is preferred by empl

    - by dbarker
    I've been building software professionally for 7 years and am considering a master's degree. I understand the difference between these two degrees as simply: MSCS is the theory while MSE is the practice. I'm equally interested in both and would be happy with either, although I'm curious how these degrees rank in the eyes of a potential employer. I could see two views that a hiring manager could possibly take: a MSCS is loftier and has an implied knowledge of Software Engineering an MSE is more practical and has an implied knowledge of Computer Science In my own experience I've seen both MSCS degree holders than cannot program at all while others are among the best programmers I've met, so of course actual ability will depend on the individual. My question is about the "on paper" value of these two degrees when seeking a job. All things considered, is one degree more hirable, higher-paying than the other?

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  • CSS selector for grouped iterations

    - by snaken
    Hi, I have a number of elements that i want to loop through as groups. Consider this HTML: <input class="matching match-1" /> <input class="matching match-1" /> <input class="matching match-2" /> <input class="matching match-2" /> <input class="matching match-2" /> <input class="matching match-3" /> <input class="matching match-3" /> // etc I want a CSS selector that would allow me to loop through these as groups so there would be - using this example - 3 iterations of the loop (one for match-1, one for match-2 and one for match-3). The 1,2,3 etc is a variable used for grouping but this is not fixed so it cannot rely on hard coding of these values. Is this even possible? I'll be using jQuery or prototype not that that should matter really. Thanks

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  • Single-Stage vs Two-Stage Animation for iPhone Apps?

    - by Devoted
    What are single-state and two-stage animation for rotating an iPhone window? This is the "error" message I get in the Debugger Console (nothing crashes): Using two-stage rotation animation. To use the smoother single-stage animation, this application must remove two-stage method implementations. I was working through the book "Beginning iPhone Development: Exploring the iPhone SDK" by Apress (Dave Mark, Jeff LaMarche) on the Swap Project.

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  • How to order <script> tags vs. <style> tags in HTML markup for best results.

    - by Tchalvak
    I'm building up my site over at http://royronalds.com, and I'm trying to figure out what order of elements in the <head> makes most sense. Just to take from what I current have, I have: <head> <style> external stylesheet <meta> <title> <link> to favicon <script> for jQuery <script> main javascript for site <script> google analytics, asynchronous script. </head> Are there reasons to order these differently so that load times and other issues happen more smoothly, and if so, what would the ideal order be?

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  • Webreference vs servicereference. Why ony one works ?

    - by phenevo
    Hi, I've got two applications. One uses webreference to my webservice, and second use servicereference to my webservice. There is metohod which I'm invoking: [WebMethod] public Car[] GetCars(string carCode) { Cars[] cars= ModelToContract.ToCars(MyFacade.GetCars(carCode); return cars; } Car has two pools: string Code {get;set;} CarType Type {get;set;} public enum CarType { Van=0, Pickup=1 } I'm debuging this webMethod, and... at the end webservice throw good collection of cars, which has one car: code="bmw",Type.Van But... Application with webrefence receives the same collection and application with servicereference gets collection, where field code is null... Invoking servicereference: MyService myService=new MyService() Cars[] cars= client.GetCars(carcode); Invoking webservice: MyService.MyServiceSoapClient client = new MyServiceS.MyServiceSoapClient(); Cars[] cars= client.GetCars(carcode);

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  • Pros/Cons of MySQL vs Postgresql for production Ruby on Rails environment?

    - by cakeforcerberus
    I will soon be switching from sqlite3 to either postgres or mysql. What should I consider when making this decision? Is mysql more suited for Rails than postgres in some areas and/or vice versa? Or, as I somewhat suspect, does it not really matter either way? Another factor that might play into my decision is the availability of tools to data pump my test data from the sqlite3 db to my new one. Is there anything that ActiveRecord provides natively to do this or any decent plugins/gems to help with this task? BONUS: How do I pronounce "Postgresql" and sound like I know what I'm talking about? :) Thanks Greg Smith for providing the following link that shows the most common pronunciations: http://www.postgresql.org/community/survey.33 UPDATE: Reference this question for more: http://stackoverflow.com/questions/110927/do-you-recommend-postgresql-over-mysql FYI: I ended up using MySQL. There is a neat plugin called yamldb that really saved me some time with the data transfer from my sqlite db to my new mysql one. Instructions on how to install and use it can be found here: http://accidentaltechnologist.com/ruby/change-databases-in-rails-with-yamldb/ Thanks Tom

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  • Does the specific signed integer matter when implementing compareTo in a Comparable <Type> class?

    - by javanix
    When implementing compareTo(), does the degree of "difference" need to be taken into account? For instance, if I have 3 objects, C1, C2, and C3, such that C1 < C2 < C3. Should C1.compareTo(C2) return an integer that is less than C2.compareTo(C3)? The documentation for the Comparable interface doesn't seem to specify one way or another, so I'm guessing the degree doesn't matter, but it would be nice to know if there is some advantage returning a specific number (for example, improving TreeSet sort speed or something). http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Comparable.html#compareTo(T)

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  • mysql medium int vs. int performance?

    - by aviv
    Hi, I have a simple users table, i guess the maximum users i am going to have is 300,000. Currently i am using: CREATE TABLE users ( id INT UNSIGEND AUTOINCEREMENT PRIMARY KEY, .... Of course i have many other tables that the users(id) is a FOREIGN KEY in them. I read that since the id is not going to use the full maximum of INT it is better to use: MEDIUMINT and it will give better performance. Is it true? (I am using mysql on Windows Server 2008) Thanks.

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