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• C# Dictionary<> and mutable keys

  - by Pierreten

  I was told that one of the many reasons strings were made immutable in the C# spec was to avoid the issue of HashTables having keys changed when references to the string keys altered their content. The Dictionary< type allows reference types to be used as a key. How does the dictionary avoid the issue of altered keys that lead to "misplaced" values? Is there a memberwise clone made of an object when used as a key?

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• Ruby Regexp methods?

  - by fjs6

  Is there a gem/example_code that allows to work with regexps? I am not looking for what a regexp can do, but what can be done to a Regexp object. For example: r = Regexp.new(...) r.min_length => the minimum length of a matching string r = Regexp.new("car(less)?") r.min_length => 3 for the string "car" Thanks!

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• OOP design for DMS that allows searching and grouping

  - by James P.

  I'd like to make a searchable Document Management System and allow a user to group documents together. On one hand, there would be a functionality that registers/fingerprints in a linear fashion and, on the other, one that associates documents into groups. How could I compromise between the two in terms of object design?

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• What's the best practice for single sign on at one web server?

  - by Jade.Wang

  We have some apps written in classic ASP, ASP.NET and PHP. They are all in one same web server. We want to transfer between the apps who is currently log in or none, we do not need to transfer everything in the session object. What is the best way? We need secure and high performance. Thanks.

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• Amazon S3 components for Delphi 2010

  - by Mick

  Besides the Amazon Integrator from /n software, are there any other Amazon S3 components available that can be used with Delphi 2010? I would use the one from /n software, but it has some issues (e.g. GetObjectInfo doesn't work if the object is stored in a specific location) and limitations (e.g. copying objects doesn't let you define replacement meta-data). I don't have the time or resources to create such a component myself. Thanks!

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• In a project that uses a DI framework, should you NEVER use the 'new' operator?

  - by Chuck

  I'm trying to wrap my head around Dependency Injection. One of the things I'm confused about is whether all of your object instantiation needs to be controlled by the DI framework (Spring, Guice, etc). Or, if not, how do you determine which objects are instantiated by the framework and which objects are instantiated with the new operator?

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• ArrayList and Map problem in grails

  - by xain

  Hi, I have a service that contains a map: static Map cargosMap = ['1':'item1','2':'item 2','3':'item 3'] that is returned via a method in the service: static Map getCargos() { [cargosMap] } A controller calls it like this: def mform = { Map cargos = empService.getCargos() [cargos:cargos] } In the gsp, I have the select: <g:select name="cg1" from="${cargos}" /> But I'm getting the exception: Error 500: Executing action ....caused exception: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object ... with class 'java.util.ArrayList' to class 'java.util.Map' Any clues ? Thanks

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• django DateTimeField list records by day

  - by dotty

  Hay, i have a field in one of my models which saves the creation date of an object created_on = models.DateTimeField(blank=False, auto_now_add=True) This works as expected. In my templates i want to list objects like this June 15 {{ objects here which was created on June 15 }} June 14 {{ objects here which was created on June 14 }} etc Any idea how i would go about doing this? Thanks in advance.

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• How is FileInfo Serialized?

  - by Josh G

  I want to save file metadata (mostly path/name) along with the contents of the file. I noticed that FileInfo is serializable. Does anyone know data is serialized when you save a FileInfo object? I would assume that only metadata is saved, not the contents of the file?

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• Change document outline dynamically

  - by alex

  I have a code void SomeButton_Click(object sender, EventArgs e) { if (this.Controls.Contains(Panel2)) { this.Controls.Remove(Panel2); } else { this.Controls.Add(Panel2); } } My problem is: the code changes document outline order of controls on my form. How can I restore previous document outline ? What properties, methods should I use ? Or is it impossible ?

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• How does init() get called on a Handler in a WebApp

  - by stevebot

  Hey, I have a Handler object that functions kind of like a service. It has a public init method defined in the Implementation but not the Interface. This Handler is also being autowired via Spring. How does the init method get invoked? Is it via Spring or does Tomcat call this?

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• basic javascript DOJO 1.4 installation not working

  - by salmane

  I am trying to give the DOJO framework a test spin but some how the latest release does not work at all ( 1.4.2) I keep getting a "console[_8]" [undefined] is not an object error. this is on the demos as well 1.3.3 works fine it seems ( or at least i dont get that error so far) any ideas? I have been using jquery for a while and love it , just looking for something better i guess. does anyone recommend DOJO? thanks

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• Why does the destructor of the class called twice ?

  - by dicaprio

  Apologies if the question sounds silly, I was following experts in SO and trying some examples myself, and this is one of them. I did try the search option but didn't find an answer for this kind. class A { public: A(){cout t; t.push_back(A()); // After this line , when the scope of the object is lost. } Why does the destructor of the class called twice ?

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• .net Generic Calls <T>

  - by Ryan

  I have a function that accepts a generic parameter T that is of type class like so : public Func<T, bool> MyMethod<T>(string paramName, object value) where T : class But when calling the function I do not have direct access to the class that needs to be the parameter. MyMethod<foo>("foo1", "foo2") Is there a way I can get the class foo via other means like reflection so I can use the function?

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• codeigniter fatal error, trying to read database

  - by ThomasReggi

  Fatal error: Call to a member function result() on a non-object in C:\wamp\www\system\application\models\users_model.php on line 8 <?php class Users_model extends Model { function get_records() { $query = $this->db->get('users'); return $query->result(); } } ?>

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• C++ error message output format

  - by sub

  If I want to trigger an error in my interpreter I call this function: Error( ErrorType type, ErrorSeverity severity, const char* msg, int line ); However, with that I can only output Name error: Undefined variable in line 1 instead of Name error: Undefined variable 'someVariableName' in line 1 I'm working entirely with strings (except for the error messages as they all are constant at the moment), so sprintf won't work. What is the best way to create an efficient error function that can output a constant message combined with a string that describes which object, e.g.: a non-existing variable, triggered the error?

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• Powershell's Get-date: How to get Yesterday at 22:00 in a variable?

  - by icnivad

  For a check i need yesterday's date at 10:00pm in a variable. I get yesterdays Date and current Time with $a = (get-date).AddDays(-1) But how do i manipulate the time to 22.00 and leave the variable still as Date-Object?

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• How to resize html canvas element?

  - by russx2

  I have a canvas element defined statically in the html with a width and height. If I attempt to use JavaScript to resize it dynamically (setting a new width and height - either on the attributes of the canvas or via the style properties) I get the following error in Firefox: uncaught exception: [Exception... "Illegal operation on WrappedNative prototype object" nsresult: "0x8057000c (NS_ERROR_XPC_BAD_OP_ON_WN_PROTO)" location: "JS frame :: file:///home/russh/Desktop/test.html :: onclick :: line 1" data: no] Is it possible to resize this element or do I have to destroy it and create a new element on the fly?

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• What setup code should go in Form Constructors versus Form Load event?

  - by Greg

  For winforms applications I'm wondering what setup code should go in: MainForm() as opposed to MainForm_Load(object sender, EventArgs e) Are there any best practice guidelines here?

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• How to do a back-reference on Google Webapp?

  - by jCuga

  I'm trying to access an object that is linked to by a db.ReferenceProperty in Google app engine. here's the model's code: class InquiryQuestion(db.Model): inquiry_ref = db.ReferenceProperty(reference_class=GiftInquiry, required=True, collection_name="inquiry_ref") And I am trying to access it in the following way: linkedObject = question.inquiry_ref and then linkedKey = linkedObject.key but it's not working. Can anyone please help?

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• SqlCommand to T-SQL

  - by Net Elemental

  Hello! Is there any way how to convert SqlCommand object to actual T-SQL command, which is sent to the SQL Server?

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• What's the best way to find the inverse of datetime.isocalendar()?

  - by Tom

  The Python datetime.isocalendar() method returns a tuple (ISO_year, ISO_week_number, ISO_weekday) for the given datetime object. Is there a corresponding inverse function? If not, is there an easy way to compute a date given a year, week number and day of the week?

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• Why wait should always be in synchronized block

  - by diy

  Hi gents, We all know that in order to invoke Object.wait() , this call must be placed in synchronized block,otherwise,IllegalMonitorStateException is thrown.But what's the reason for making this restriction?I know that wait() releases the monitor, but why do we need to explicitly acquire the monitor by making particular block synchronized and then release the monitor by calling wait() ? What is the potential damage if it was possible to invoke wait() outside synch block, retaining it's semantics - suspending the caller thread ? Thanks in advance

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• Pause the log4c++ logger

  - by chedi

  Hi, is it possible to pause the logger in log4c++, and by pause I mean to stop writing messages in the log file but not finalize the logger object or delete it. thanks in advance

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• how can you find out if an NSObject has a certain property?

  - by strawtarget

  Let's say in Apple API version 1.0, there is a class NSFoo with a property 'color'. API 1.1 adds property 'size'. I want to know whether I can use the getter: myFoo.size [myFoo respondsToSelector:@selector(getSize)] doesn't work as expected. What's the correct way to find out if an object has a property? Thanks!

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