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• Objective C message dispatch mechanism

  - by Dolphin

  I am just staring to play around with Objective C (writing toy iPhone apps) and I am curious about the underlying mechanism used to dispatch messages. I have a good understanding of how virtual functions in C++ are generally implemented and what the costs are relative to a static or non-virtual method call, but I don't have any background with Obj-C to know how messages are sent. Browsing around I found this loose benchmark and it mentions IMP cached messages being faster than virtual function calls, which are in turn faster than a standard message send. I am not trying to optimize anything, just get deeper understanding of how exactly the messages get dispatched. How are Obj-C messages dispatched? How do Instance Method Pointers get cached and can you (in general) tell by reading the code if a message will get cached? Are class methods essentially the same as a C function (or static class method in C++), or is there something more to them? I know some of these questions may be 'implementation dependent' but there is only one implementation that really counts.

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• How to make screenshots using VMWare tool "vmrun"?

  - by youllknow

  Hi everybody! I'm currently working with the vmrun-Tool, to control VMWare Virtual Machines. I'm using VMWareWorkstation 7.0.0/7.0.1 and VMWarePlayer 3.0.0 on Windows 7 x64. I simply want to take a screenshot of each virtual machine which is powered on. Listing the power-on virtual machines is quite simply and works! (vmrun list) But the captureScreen command doesn't work. I have tryed serveral commandline options. for example: vmrun -T ws captureScreen %VMPATH% %OUTPUTPATH% I get no error message, but the console is blocked (and the command never finishes). I have also tryed to include -gu USERNAME and -gp PASSWORD, but it result in the same problem. Sorry for my English and thanks for your help in advance!!!

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• pure-specifier on function-definition

  - by bebul

  While compiling on GCC I get the error: pure-specifier on function-definition, but not when I compile the same code using VS2005. class Dummy { //error: pure-specifier on function-definition, VS2005 compiles virtual void Process() = 0 {}; }; But when the definition of this pure virtual function is not inline, it works: class Dummy { virtual void Process() = 0; }; void Dummy::Process() {} //compiles on both GCC and VS2005 What does the error means? Why cannot I do it inline? Is it legal to evade the compile issue as shown in the second code sample?

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• Automatic Schema Validation using NHibernate/ActiveRecord

  - by Krembo

  Hi, let's assume I have a table of Products with columns: Id, Name, Price and using NHibernate (or ActiveRecord) I map the table to the POCO: public class Product { public virtual long Id { get; set; } public virtual string Name { get; set; } public virtual double Price { get; set; } } Now if someday a new column named ShipmentPrice (let's assume it's double too) will be added to the Products table, is there any way I can automatically know that. For saying automatically I mean adding code to do that or getting an exception? (I assume I don't have control on the columns of the table or a way to know of any changes to the table's schema in advance)

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• Fluent-NHibernate - Component property attributes ignored by Convention

  - by BobTodd

  I have a component with a number of properties that have various attributes Normally when these attributes are added to a plain old domain object they are picked up by my custom AttributeConventions. For the Component properties they are not. Is there some extra wiring needed for these? e.g. public class Component { [Length(Max=50)] public virtual string Name {get; set;} } public class MyClass { public virtual Component Component {get; set;} [Length(Max=50)] public virtual string Color {get; set;} } I get a table MyClass with columns Color & ComponentName Color is an nvarchar(50) whilst ComponentName is an nvarchar(255) (the default)

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• Problem using FluentNHibernate, SQLite and Enums

  - by weenet

  I have a Sharp Architecture based app using Fluent NHibernate with Automapping. I have the following Enum: public enum Topics { AdditionSubtraction = 1, MultiplicationDivision = 2, DecimalsFractions = 3 } and the following Class: public class Strategy : BaseEntity { public virtual string Name { get; set; } public virtual Topics Topic { get; set; } public virtual IList Items { get; set; } } If I create an instance of the class thusly: Strategy s = new Strategy { Name = "Test", Topic = Topics.AdditionSubtraction }; it Saves correctly (thanks to this mapping convention: public class EnumConvention : IPropertyConvention, IPropertyConventionAcceptance { public void Apply(FluentNHibernate.Conventions.Instances.IPropertyInstance instance) { instance.CustomType(instance.Property.PropertyType); } public void Accept(FluentNHibernate.Conventions.AcceptanceCriteria.IAcceptanceCriteria criteria) { criteria.Expect(x = x.Property.PropertyType.IsEnum); } } However, upon retrieval, I get an error regarding an attempt to convert Int64 to Topics. This works fine in SQL Server. Any ideas for a workaround? Thanks.

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• python optparse, how to include additional info in usage output?

  - by CarpeNoctem

  Using python's optparse module I would like to add extra example lines below the regular usage output. My current help_print() output looks like this: usage: check_dell.py [options] options: -h, --help show this help message and exit -s, --storage checks virtual and physical disks -c, --chassis checks specified chassis components I would like it to include usage examples for the less *nix literate users at my work. Something like this: usage: check_dell.py [options] options: -h, --help show this help message and exit -s, --storage checks virtual and physical disks -c, --chassis checks specified chassis components Examples: check_dell -c all check_dell -c fans memory voltage check_dell -s How would I accomplish this? What optparse options allow for such? Current code: import optparse def main(): parser = optparse.OptionParser() parser.add_option('-s', '--storage', action='store_true', default=False, help='checks virtual and physical disks') parser.add_option('-c', '--chassis', action='store_true', default=False, help='checks specified chassis components') (opts, args) = parser.parse_args()

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• inheritance and hidden overloads

  - by Caspin

  The following code doesn't compile. struct A {}; struct B {}; class Base { public: virtual void method( A param ) { } virtual void method( B param ) = 0; }; class Derived : public Base { public: //using Base::method; void method( B param ) { } }; int main() { Derived derived; derived.method(A()); } The compiler can't find the overload of method() that has an A parameter. The 'fix' is to add a using declaration in the derived class. My question is why. What is the rational for a weird language rule like this? I verified the error in both GCC and Comeau, so I assume this isn't a compiler bug but a feature of the language. Comeau at least gives me this warning: "ComeauTest.c", line 10: warning: overloaded virtual function "Base::method" is only partially overridden in class "Derived" class Derived : public Base ^

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• HierarchicalDataTemplate Link By Parent

  - by Andrew Kalashnikov

  Hello colleagues. I want bind my treeview. There are a lot of samples binding treeview by object, which contains children collection. I've got domain having just Parent pointer. public class Service : BaseDomain { public virtual string Name { get; set; } public virtual string Description { get; set; } public virtual Service Parent { get; set; } } Can I bind collection of this objects to my treeView. Thanks

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• Trying to establish remote debug with visual studio running inside vmpalyer

  - by Kazoom

  i have this configuration a visual studio running inside virtual machine. the host machine has xp on it and so does the virtual machine. i have to run remote debug on the third machine which is connected to the host machine. i m currently facing this problem i m not able to ping my virtual machine from my host machine, however reverse is possible. how to resolve that? both my machine are on same workgroup (not domain, arent they both same?)

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• C#: How to inherit constructors?

  - by Ian Boyd

  Imagine a base class with many constructors and a virtual method public class Foo { ... public Foo() {...} public Foo(int i) {...} ... public virtual void SomethingElse() {...} ... } and now I want to create a descendant class that overrides the virtual method: public class Bar : Foo { public override void SomethingElse() {...} } And another descendant that does some more stuff: public class Bah : Bar { public void DoMoreStuff() {...} } Do I really have to copy all constructors from Foo into Bar and Bah? And then if I change a constructor signature in Foo, do I have to update it in Bar and Bah? Is there no way to inherit constructors? Is there no way to encourage code reuse?

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• abstract method signature, inheritance, and "Do" naming convention

  - by T. Webster

  I'm learning about design patterns and in examples of code I've seen a convention where the abstract class declares a method, for example: public abstract class ServiceBase { ... public virtual object GetSomething(); and then protected abstract object DoGetSomething(); My question is on why these two methods exist, since they appear to serve the same purpose. Is this so that the base class GetSomething() method logic cannot be overridden by inherited classes? But then again, the method is marked virtual, so it can be overridden anyway. What is the usefulness here in requiring derived class implementers to implement the abstract method when the virtual method can be called anyway?

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• How to create mapping for a List<SomeNativeType> in FluentNhibernate ?

  - by Mahesh Velaga

  Hi all, I am trying to create a mapping file for the following Model using Fluent NHibernate. But, I am not sure of how to do the mapping for the List in the mapping file. public class MyClass { public virtual Guid Id { get; set; } public virtual string Name { get; set; } public virtual List<string> MagicStrings { get; set; } } public class EnvironmentMapping : ClassMap<Models.Environment> { public EnvironmentMapping() { Id(x => x.Id); Map(x => x.Name); //HasMany(x => string) What should this be ? } } Help in this regard is much appreciated. Thanks!

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• Profile:Object reference not set to an instance of an object

  - by sallalman83

  Hi, i just lunch my web site i used the asp.net routing technology on it, and its work fine in my localhost but when i moved the project to the hosting server(Godaddy.com) its just work fine when there is no virtual sub directories like this(havebreak.com) but when u click on this link (havebreak.com/Registration/) or any other links that contain a virtual sub-directories its give Object reference not set to an instance of an object error on the profile object if (!Profile.IsAnonymous) Line 18: mlvRegistratioin.ActiveViewIndex = 1; i check my IIS settings and found it using the "Integrated pipeline" as recommended (at least at my knowledge), i checked the httpModules and httpHandlers tags under the system.webServer (since my hosting plan use the IIS7) and under the normal tag and every thing is fine then i used the url-rewriting instead of URL-Routing and the same problem exist and i notice that the session also not working in the virtual sub-directories too and by the way the ASP.NET routing work fine with my site its just the profile and session objects that not workin any help will be appreciated

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• Dynamic filling WrapPanel buttons from DB, setting the event handlers

  - by Anry

  I have a table: I'm using NHibernate. The class of entity: public class PurchasedItem { public virtual int Id { get; set; } public virtual Product Product { get; set; } public virtual int SortSale { get; set; } } I want to get all the records table PurchasedItems (my method returns an IList ). Records are sorted in descending order (column SortSale). How to fill WrapPanel buttons from the list IList ? For each button assign the event handler. By pressing the button display a message with the name of the product.

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• Using Alias in Apache ONLY if local directory not present?

  - by Andrew E.

  Hey all, We're running a reseller web host, and aliasing a particular directory for ALL the sites within. This is all happening through WHM/Cpanel, which could possibly complicate my question. We want all hosts to run their "/concrete" directory through a shared location on the server. This is working fine by adding "Alias /concrete/ "/usr/local/share/concrete5/concrete-latest/concrete/" to the apache include editor in WHM. However, if a local concrete/ directory exists within the particular webroot of the virtual host, we'd rather use that than "/concrete" globally. It would also be nice if we could make this alias change in the context of the virtual host, within WHM (and I haven't found a great way to modify virtual host sections in WHM without hacking a file that I don't believe we're supposed to hack.) Thoughts?

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• Restricting access to a website by IP address range / domain

  - by test

  Hi, I would like advice on the best way to restrict access to a weba pplication (using .net 2.0 and II6) based on the clients IP address. The two ways I am considering: 1) Through the server side code - check the client I.P against a list of IP addresses within the web.config. 2) Through IIS by creating a virtual directory and restricting the I.P addresses on this virtual directory. My question is if I go the virtual directory route there are a lot of users that access this website and I have read reverse domain lookups made during each client request can be very expensive on server resources. How much of a risj is this? Any other suggestions /ideas to doing this would be much appreciated Thanks advance,

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• How can I check if a value exists in a list using C#

  - by Samantha J

  I have the following code that gives me a list of id and names from the new ASP.NET MVC5 Identity: var identityStore = new IdentityStore(); var users = ( from user in identityStore.DbContext.Set<User>() select new { id = user.Id, name = user.UserName } ); How could I modify this so that it allows me to check if a UserName exists? Here's the user class: public class User : IUser { public User(); public User(string userName); [Key] public string Id { get; set; } public virtual ICollection<UserLogin> Logins { get; set; } public virtual UserManagement Management { get; set; } public virtual ICollection<UserRole> Roles { get; set; } public string UserName { get; set; } }

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• Linq to NHibernate - How to include parent object and only certain child objects

  - by vakman

  Given a simplified model like the following: public class Enquiry { public virtual DateTime Created { get; set; } public virtual Sender Sender { get; set; } } public class Sender { public virtual IList<Enquiry> Enquiries { get; set; } } How can you construct a Linq to Nhibernate query such that it gives you back a list of senders and their enquiries where the enquiries meet some criteria. I have tried something like this: return session.Linq<Enquiry>() .Where(enquiry => enquiry.Created < DateTime.Now) .Select(enquiry => enquiry.Sender) In this case I get an InvalidCastException saying you can't cast type Sender to type Enquiry. Any pointers on how I can do this without using HQL?

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• Return a URI for local resource from a webservice

  - by peterkellyonline

  I want to design a webservice that returns a URI to a local resource on the webserver. What is the best (simplest) way to do this in C# using .asmx webservice? Or in other words - how can I get the URI for a physical file path in a webservice? Build a URI using the Uri class and the [WebService] namespace attribute? I know there is Server.MapPath(); that converts a virtual path into the corresponding physical path. I am looking for a way to do the opposite - having the physical path, I want to get not only the virtual path but the full URI. So if the webservice URI is http://some.server.com/services/example.asmx, the virtual path to the file I want to return is /Updates/file.xml and the physical path to that file is C:\Updates\file.xml what is the best way to get the URI http://some.server.com/updates/file.xml from that information? Thanks

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• Interface -> Entity Mapping

  - by KiD0M4N

  Hi guys, Suppose I have a few definitions like so: public interface ICategory { int ID { get; set; } string Name { get; set; } ICategory Parent { get; set; } } public class Category : ICategory { public virtual int ID { get; set; } public virtual string Name { get; set; } public virtual ICategory Parent { get; set; } } How do I map such a scenario in NHibernate? I am trying to separate the implementation of the DAL. I am learning NHibernate. Regards, Karan

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• Linq to NHibernate - How to return a parent object with only certain child objects included

  - by vakman

  Given a simplified model like the following: public class Enquiry { public virtual DateTime Created { get; set; } public virtual Sender Sender { get; set; } } public class Sender { public virtual IList<Enquiry> Enquiries { get; set; } } How can you construct a Linq to Nhibernate query such that it gives you back a list of senders and their enquiries where the enquiries meet some criteria. I have tried something like this: return session.Linq<Enquiry>() .Where(enquiry => enquiry.Created < DateTime.Now) .Select(enquiry => enquiry.Sender) In this case I get an InvalidCastException saying you can't cast type Sender to type Enquiry. Any pointers on how I can do this without using HQL?

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• mapping 'value object' collection in (Fluent) NHibernate

  - by adrin

  I have the following entity public class Employee { public virtual int Id {get;set;} public virtual ISet<Hour> XboxBreakHours{get;set} public virtual ISet<Hour> CoffeeBreakHours {get;set} } public class Hour { public DateTime Time {get;set;} } (What I want to do here is store information that employee A plays Xbox everyday let's say at 9:00 13:30 and has a coffee break everyday at 7:00 12:30 18:00) - I am not sure if my approach is valid at all here. The question is how should my (ideally fluent) mappings look like here? It is not necessary (from my point of view) for Hour class to have Id or be accessible from some kind of repository.

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• C++: Avoid .cpp files with only an empty (de)constructor

  - by Martijn Courteaux

  Hi, When I have a header file like this: #ifndef GAMEVIEW_H_ #define GAMEVIEW_H_ #include <SDL/SDL.h> class GameView { public: GameView(); virtual ~GameView(); virtual void Update() = 0; virtual void Render(SDL_Surface* buffer) = 0; }; #endif /* GAMEVIEW_H_ */ I need to create a .cpp file like this: #include "GameView.h" GameView::~GameView() { } GameView::GameView() { } This is a bit stupid. Just a .cpp file for an empty constructor and deconstructor. I want to implement that method simply in the header file. That is much cleaner. How to do this?

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• non-scalar type requested

  - by lego69

  can somebody please help me with an error conversion from `A' to non-scalar type `B' requested I have class A and derived from it B, but I have problems with these rows: A a(1); A *pb = new B(a); B b = *pb; //here I have an error thanks in advance for any help class A { protected: int player; public: A(int initPlayer = 0); A(const A&); A& operator=(const A&); virtual ~A(){}; virtual void foo(); void foo() const; operator int(); }; class B: public A { public: B(int initPlayer): A(initPlayer){}; ~B(){}; virtual void foo(); };

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