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• What exactly is a memory page fault?

  - by dontWatchMyProfile

  From the docs: Note: Core Data avoids the term unfaulting because it is confusing. There's no “unfaulting” a virtual memory page fault. Page faults are triggered, caused, fired, or encountered. Of course, you can release memory back to the kernel in a variety of ways (using the functions vm_deallocate, munmap, or sbrk). Core Data describes this as “turning an object into a fault”. Is a Fault in Core Data essentially a memory page fault? I have only a slight idea about what a memory page is. I believe it's a kind of "piece of code in memory" which is needed to execute procedures and stuff like that, and as the app is runing, pieces of code are sucked into memory as "pages" and thrown away as they're not needed anymore. Probably 99% wrong ;) Anyone?

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• Class views in Django

  - by Sebastjan Trepca

  Django view points to a function, which can be a problem if you want to change only a bit of functionality. Yes, I could have million keyword arguments and even more if statements in the function, but I was thinking more of an object oriented approach. For example, I have a page that displays a user. This page is very similar to page that displays a group, but it's still not so similar to just use another data model. Group also has members etc... One way would be to point views to class methods and then extend that class. Has anyone tried this approach or has any other idea?

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• JPA Native Query (SQL View)

  - by Uchenna

  I have two Entities Customer and Account. @Entity @Table(name="customer") public class Customer { private Long id; private String name; private String accountType; private String accountName; ... } @Entity @Table(name="account") public class Account { private Long id; private String accountName; private String accountType; ... } i have a an sql query select a.id as account_id, a.account_name, a.account_type, d.id, d.name from account a, customer d Assumption account and customer tables are created during application startup. accountType and accountName fields of Customer entity should not be created. That is, only id and name columns will be created. Question How do i run the above sql query and return a Customer Entity Object with the accountType and accountName properties populated with sql query's account_name and account_type values. Thanks

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• Detect EXIF Orientation of an image in javascript

  - by Obi Wan

  In my mobile web application, I have a need to examine the EXIF orientation tag of an image file selected using an input type=file control, and this needs to be done on the client side in javascript, before the selected image file gets uploaded to the server. I have seen several threads similar to this but most of them say to use a library called binaryajax.js to be able to access the EXIF data from the file object. Unfortunately, simply including binaryajax.js in my project causes an Access Denied error in jQuery 1.7.1, and I have no idea why this is happening. This error precludes me from using this jquery library. So I am looking for a solution that does not use this library. Another library I have tried to use is jquery.exif.js and I also get an Access Denied Error Trying to use it.

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• Rails - How to secure foreign keys and still allow association selection

  - by Bryce

  For simplicity, assume that I have a simple has-many-through relationship class User < ActiveRecord::Base has_many :courses, :through => :registrations end class Registration < ActiveRecord::Base belongs_to :user belongs_to :course end class Course < ActiveRecord::Base has_many :users, :through => :registrations end I want to keep my app secure, so I use attr_accessible to whitelist my attributes. My question is twofold: How would I set up my whitelist attributes such that I could create a new Registration object through a form (passing in :user and :course, but not risk allowing those foreign keys to be maliciously updated later? How would I set up my validations such that both belongs_to associations are required BUT also allow for Registration objects to be created in nested forms?

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• What are the disadvantages of using a StringBuilder?

  - by stickman

  I know that StringBuilder is more efficient than a normal string when processing code which modifies the string value a lot because although strings act like value types, they are actually reference, which makes them immutable so every time we change it, we need to create a new reference in memory. My question is that, why doesn't .NET just use stringBuilder by default? There must be some disadvantages of it over just using String. Can anyone tell me what they are? The only thing I can think of is perhaps it is a heavier object and it takes more time to instantiate so if you aren't changing the string too much, this would override the benefits of StringBuilder

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• fstream file I/O question

  - by Konrad

  Hi, I am trying to work out if I need to call close on a fstream object if the intial open failed. i.e. std::fstream strm; strm.open( "filename" ); if( ! strm.fail() ) { // Do something strm.close(); // [1] } strm.close(); // [2] Where should close be called here - should it always be called [2] or only if the open succeeds[1]? I may be going over the top here, but coming from the Windows API way of typically doing this I have CloseHandle( ... ); embedded in my mind :-)

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• Force to reimplement a static function in inherit classes

  - by pacopepe

  Hi, I have a program in C++ with plugins (dynamic libs). In the main program, I want to execute a static function to check if i can create a object of this type. An example without dynamic libs (aren't neccesary to understand the problem): #include "libs/parent.h" #include "libs/one.h" #include "libs/two.h" int main(int argc, char * argv[]) { Parent obj; if (One.match(argv[1])) { obj = new One(); else if (Two.match(argv[1])) { obj = new Two(); } Now, i have a interface class named Parent. All plugins inherit from this class. Ideally, I have a virtual static function in Parent named match, and all the plugins need to reimplement this function. The problem with this code is that i can't do a static virtual function in C++, so i don't know how to solve the problem. Sorry for mi english, i did my best

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• Searching for range overlaps in Ruby hashes

  - by mbm

  Say you have the following Ruby hash, hash = {:a => [[1, 100..300], [2, 200..300]], :b => [[1, 100..300], [2, 301..400]] } and the following functions, def overlaps?(range, range2) range.include?(range2.begin) || range2.include?(range.begin) end def any_overlaps?(ranges) # This calls to_proc on the symbol object; it's syntactically equivalent to # ranges.sort_by {|r| r.begin} ranges.sort_by(&:begin).each_cons(2).any? do |r1, r2| overlaps?(r1, r2) end end and it's your desire to, for each key in hash, test whether any range overlaps with any other. In hash above, I would expect hash[:a] to make me mad and hash[:b] to not. How is this best implemented syntactically?

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• How do I get the raw dimensions of a bitmap in an ImageView?

  - by potatoe

  It seems like I might be overlooking something obvious, but I can't figure out how to retrieve the raw (unscaled) dimensions of a bitmap being displayed in an ImageView. For example, if I load a bitmap using Bitmap b = BitmapFactory.decodeResource(...), I can get those dimensions from b.getWidth() and b.getHeight(), and I could pass the bitmap into an ImageView using setImageBitmap(b). But if I have a subclass of ImageView, is there any way to retrieve those dimensions without having to pass them in explicitly? I guess I'm looking for a getImageBitmap() analog of ImageView's setImageBitmap() method, which would retrieve a Bitmap object that I can call getWidth() and getHeight() on. Any other way to retrieve the original dimensions would work too, though.

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• An RMIPRoxyFactoryBean factory in Spring?

  - by Robert Munteanu

  I'm currently using a Spring RmiProxyFactoryBean to access remote services. Since requirements have changed, I need to specify at runtime a different host - there can be many of them - , but the remoteServiceInterface and the non-host components of the remoteServiceUrl remain the same. Conceptually speaking, I'd see a bean definition similar to: <bean class="org.springframework.remoting.rmi.RmiProxyFactoryBeanFactory"> <property name="serviceInterface" value="xxx"/> <property name="serviceUrl" value="rmi://#{HOST}:1099/ServiceUrl"/> </bean> which exposes a Object getServiceFor(String hostName); Is there such a service available with Spring? Alternatively, do you see another way of doing this? Please note that the host list will not be known at compile or startup time, so I can't generate it in the xml file.

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• Are memory leaks ever ok?

  - by Imbue

  Is it ever acceptable to have a memory leak in your C or C++ application? What if you allocate some memory and use it until the very last line of code in your application (for example, a global object's deconstructor)? As long as the memory consumption doesn't grow over time, is it OK to trust the OS to free your memory for you when your application terminates (on Windows, Mac, and Linux)? Would you even consider this a real memory leak if the memory was being used continuously until it was freed by the OS. What if a third party library forced this situation on you? Would refuse to use that third party library no matter how great it otherwise might be? I only see one practical disadvantage, and that is that these benign leaks will show up with memory leak detection tools as false positives.

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• [WM 6.5 / C#] Send SMS AND copy them into the "sent messages" folder

  - by netblognet

  Hello, I'm developing an application for windows mobile 6.5. Im writing the code in c#.net and want to send sms due to my app. I checked out the POOM and sms sending worked fine. Code: SmsMessage msg = new SmsMessage(); msg.To.Add(receiver); msg.Body = messageText; msg.Send(); But there's one problem. I want that the messages will be saved/copied to the "send messages" folder, after my program has sent them. How can I realize that. Is it possible with the POOM, oder should I work with MAPI and generate a converted copy of the msg-Object in the "send messages"-folder? greets, raffi

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• NSArray : release its objects, but keep a pointer to it.

  - by Leo

  Hello, I declare an NSArray in my code then building the array from another array. I process my NSArray and when I'm finished, I would like to release the objects, but I'm reusing this pointer to NSAarray again later to do the same process (creating the array from another array, process then releasing).. So I need to keep the pointer. What should I do ? Here is roughly what I want to do, the buildArray is creating and returning an autoreleased NSArray : NSArray *myArray; for (int i = 0, i < 10, i++){ [myArray arrayWithArray:[self buildArray]]; // Here I process myArray [myArray = nil] // is my guess } I need to keep a pointer to my NSArray, in order to reuse later in the loop, but what is happening to the objects created with [self buildArray]? What is the best to do in order not to keep unused object and arrays ? Or maybe the best solution is simply to removeAllObject of the array..? Thank you!

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• How do I switch the table that is queried with linq-to-sql

  - by Ian Ringrose

  We have two tables with the same set of columns; depending on the “type” of object the value is stored in one of the two tables. I wish to use common code to access these two tables. If I was using “raw sql” I could just use String.Format() to change the table name. (Likewise for updates etc) The two separate tables are needed as the data access patterns are very different for the common queries on the two tables and therefore different indexes are needed. “Views” and “instead of triggers” etc to make the tables look like a single table are not liked here. A lot of our customers use low end version of SqlServer so we cannot use partition tables.

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• Threading and iterating through changing collections

  - by adamjellyit

  In C# (console app) I want to hold a collection of objects. All objects are of same type. I want to iterate through the collection calling a method on each object. And then repeat the process continuously. However during iteration objects can be added or removed from the list. (The objects themselves will not be destroyed .. just removed from the list). Not sure what would happen with a foreach loop .. or other similar method. This has to have been done 1000 times before .. can you recommend a solid approach?

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• Operator as and generic classes

  - by abatishchev

  I'm writing .NET On-the-Fly compiler for CLR scripting and want execution method make generic acceptable: object Execute() { return type.InvokeMember(..); } T Execute<T>() { return Execute() as T; /* doesn't work: The type parameter 'T' cannot be used with the 'as' operator because it does not have a class type constraint nor a 'class' constraint */ // also neither typeof(T) not T.GetType(), so on are possible return (T) Execute(); // ok } But I think operator as will be very useful: if result type isn't T method will return null, instead of an exception! Is it possible to do?

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• How to connect Model through Controller to View using bindings?

  - by Paperflyer

  I have an NSTextField in my view. Its value is bound to an NSNumber *number in my controller. The controller simply calls through to the model (value) to get the appropriate value. // In the controller - (NSNumber *)number { return [NSNumber numberWithFloat:[model value]]; } - (void)setNumber:(NSNumber *)aNumber { [model setValue:[aNumber floatValue]]; } This is fine, only the controller is not notified of model changes and thus, changing the value in the model does not update the NSTextField. The only other option I can think of is to have the model notify the controller and the controller manually update the view through an Outlet. But this circumvents the binding. // In the model, after value change [[NSNotificationCenter defaultCenter] postNotificationName:@"ValueChanged" object:self]; // In the controller, after being notified - (void)updateView:(NSNotification *)aNotification { [myTextField setFloatValue:[model value]]; } Is there a better, binding-aware way to implement this communication?

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• Find objects between two dates MongoDB

  - by Tom

  I've been playing around storing tweets inside mongodb, each object looks like this: { "_id" : ObjectId("4c02c58de500fe1be1000005"), "contributors" : null, "text" : "Hello world", "user" : { "following" : null, "followers_count" : 5, "utc_offset" : null, "location" : "", "profile_text_color" : "000000", "friends_count" : 11, "profile_link_color" : "0000ff", "verified" : false, "protected" : false, "url" : null, "contributors_enabled" : false, "created_at" : "Sun May 30 18:47:06 +0000 2010", "geo_enabled" : false, "profile_sidebar_border_color" : "87bc44", "statuses_count" : 13, "favourites_count" : 0, "description" : "", "notifications" : null, "profile_background_tile" : false, "lang" : "en", "id" : 149978111, "time_zone" : null, "profile_sidebar_fill_color" : "e0ff92" }, "geo" : null, "coordinates" : null, "in_reply_to_user_id" : 149183152, "place" : null, "created_at" : "Sun May 30 20:07:35 +0000 2010", "source" : "web", "in_reply_to_status_id" : { "floatApprox" : 15061797850 }, "truncated" : false, "favorited" : false, "id" : { "floatApprox" : 15061838001 } How would I write a query which checks the *created_at* and finds all objects between 18:47 and 19:00? Do I need to update my documents so the dates are stored in a specific format? Thanks

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• c++ design question: Can i query the base classes to find the number of derived classes satisfying a

  - by vivekeviv

  I have a piece of code like this class Base { public: Base(bool _active) { active = _active; } void Configure(); void Set Active(bool _active); private: bool active; }; class Derived1 : public Base { public: Derived1(bool active):Base(active){} }; similarly Derived 2 and Derived 3 Now if i call derived1Object.Configure, i need to check how many of the derived1Obj, derived2Obj,derived3Obj is active. Should i add this in the "Base" class like a function say, GetNumberOfActive()? And If the implementation is like this: class Imp { public: void Configure() { //Code instantiating a particular Derived1/2/3 Object int GetNumberOfActiveDerivedObj(); baseRef.Configure(int numberOfActiveDerivedClasses); } prive: Derived1 dObj1(true); Derived2 dObj2(false); Derived3 dObj3(true); }; should i calculate the numberOfActive Derived Objects in Imp Class? THanks

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• How to pass value to another view-controllers?

  - by ICoder

  I want to pass localstringtextnote to Uploadviewcontroller by this way , UIViewController *controllerNew = [[UploadViewController alloc] initWithNibName:@"UploadView" bundle:nil owner:self]; controllerNew.localStringtextnote = localStringtextnote; [self.navigationController pushViewController:controllerNew animated:YES]; [controllerNew release]; but i got this error"@property localstringtextnote not fond in the object of type uiviewcontroller" or i want to pass through modalTransistionstyle UploadViewController *aSecondViewController = [[UploadViewController alloc] initWithNibName:@"UploadView" bundle:nil]; aSecondViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical; [self presentModalViewController:aSecondViewController animated:YES]; [UIView commitAnimations]; How to do this?Thanks in advance.

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• C++ Memory allocation question involving vectors

  - by TheFuzz

  vector< int > vect; int *int_ptr = new int(10); vect.push_back( *int_ptr ); I under stand that every "new" needs to be followed by a "delete" at some point but does the clear() method clean this memory? What about this method of doing the same thing: vector< int > vect; int int_var = 10; vect.push_back( int_var ); From what I understand, clear() calls the variables destructors, but both vect.push_back() methods in this example push an object on the vector, not a pointer. so does the first example using an int pointer need something other than clear() to clean up memory?

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• Error when customize ValidationMessageFor

  - by user1542080

  i want to customize ValidationMessageFor which display error. when i run application, a get an error : No overload for method 'ValidationMessageFor' takes 1 arguments I'm understand my error, but i don't know how to fix it ? I need some suggest . Thanks you for reading! My code : using System.Linq.Expressions; using System.Web; using System.Web.Mvc; namespace OurCompanyUI.app_code { public static class MyHtml { public static MvcHtmlString ValidationMessageFor<TModel, TProperty>( this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, string validationMessage, IDictionary<string, Object> htmlAttributes ) { string modelName = ExpressionHelper.GetExpressionText(expression); TagBuilder p = new TagBuilder("p"); p.InnerHtml = htmlHelper.ValidationMessageFor(htmlHelper,expression).ToString(); // p.InnerHtml = htmlHelper.ValidationMessageFor().ToString(); return MvcHtmlString.Create(p.ToString(TagRenderMode.Normal)); } } }

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• Cannot convert to string [on hold]

  - by user3598883

  I am trying to transfer information from form1 to form2 and I am getting the error of "Cannot implicitly convert type form1.employee to 'string' Some coding i have used for this transfer process is as follows: (everything is set to public) I'll Also add that I ONLY have it set to FirstName.FirstName because it seems tog et it to work if I remove one one of the FirstName then It tells me it cannot convert to string public void Enter_Click(object sender, EventArgs e) Form2 frm2 = new Form2(); Employee FirstName = new Employee(); if (Directions.Text == "Please Enter Employee First Name") { FirstName.FirstName = Info.Text; Directions.Text = "Please Enter Employee Last Name"; } frm2.FN.Text = FirstName; public class Employee { public string FirstName; }

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• C#: Using regular expression (Regex) to duplicate a specific character in a string

  - by user3703944

  Anyone know how to use regex to duplicate a specific character in a string? I have a path that is entered like this: C:/Example/example I would like to use regex (or any other method) to display it like this: C://Example//example Is it possible? This is where I'm getting the file path private void btnSearchImage_Click_1(object sender, EventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); ofd.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp"; if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK) { string filenName = ofd.FileName; pictureBox1.Image = new Bitmap(filenName); string path = filenName; txtimgPath.Text = path; } } Thanks

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