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• Reducing Bitmap bit-size in C#

  - by mouthpiec

  Hi, I am using C#, and having an image stored in the object Bitmap. Now I would like to convert this image into 8bit greyscale, then into a 4-bit greyscale image. Do you have any tips how this can be made?

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• TextBox and Thread

  - by gloris

  Why doesn't this work? The program stops on: this.textBox1.Text = "(New text)"; Thread demoThread; private void Form1_Load(object sender, EventArgs e) { this.demoThread = new Thread(new ThreadStart(this.ThreadProcUnsafe)); this.demoThread.Start(); textBox1.Text = "Written by the main thread."; } private void ThreadProcUnsafe() { while (true) { Thread.Sleep(2000); this.textBox1.Text = "(New text)"; } }

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• How do I remove a child later? (cocos2d)

  - by RexOnRoids

  I added a child like this inside of a CCLayer: [self addChild:object1]; Later on I want to remove that object from the children. Ummm so how do I do that? Thanks.

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• Preventing call of a private constructor from within the class in java

  - by code_pro

  Hi We can resrict the creation of object of a class by making it's constructor private. But this constructor could still be called from within the class. is there anyway to prevent this in Java? Thnx.

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• how to get varchar as byte[] using DataReader in Ado.Net?

  - by Krishna

  how to get varchar as byte[] data using DataReader in Ado.Net? We have tried the following code. if (!objDataReader.IsDBNull(i)) { long len = objDataReader.GetBytes(i, 0, null, 0, 0); byte[] buffer = new byte[len]; objDataReader.GetBytes(i, 0, buffer, 0, (int)len); } But the above code gives the error ("Unable to cast object of type 'System.String' to type 'System.Byte[]'.")

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• relational type operation on key value storage

  - by wayne

  in my objects table i have id | type | parent | order | created and then in my data table i have object_id | key | value i want to get object of type 'x' where key 'y' === 'z' in the most optimal way possible. ie. get user where slug === 'jonny' i'm currently doing it with joins, because i'm doing this in mysql as a quick test. but i'll be moving to redis or a similar key/value storage system so obviously that won't work.

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• What are the best practices for implementing the == operator for a class in C#?

  - by remio

  While implementing an == operator, I have the feeling that I am missing some essential points. Hence, I am searching some best practices around that. Here are some related questions I am thinking about: How to cleanly handle the reference comparison? Should it be implemented through a IEquatable<T>-like interface? Or overriding object.Equals? And what about the != operator? (this list might not be exhaustive).

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• NSMutableArray of NSString in CoreData(iPhone

  - by azia

  I have a class, which describe an object for parsing XML. This class contains NSStrings and NSMutableArrays of NSStrings.I want to store parsed data using CoreData. How should I write CoreData model to store such objects if there is no such data type like NSMutableArray? Is there any way?

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• setTimeout not working in windows script (jscript)

  - by Sibo Lin

  When I try to run the following code in my program setTimeout("alert('moo')", 1000); I get the following error Error: Object expected Code: 800A138F Source: Microsoft JScript runtime error Why? Am I calling the wrong function? What I want to do is delay the execution of the subsequent function.

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• How do I output an ISO-8601 formatted string in Javascript?

  - by James A. Rosen

  I have a date object from which I'd like to render an HTML snippet like <abbr title="2010-04-02T14:12:07">A couple days ago</abbr>. I have the "relative time in words" portion from another library. How do I render the title portion? I've tried the following: isoDate: function(msSinceEpoch) { var d = new Date(msSinceEpoch); return d.getUTCFullYear() + '-' + (d.getUTCMonth() + 1) + '-' + d.getUTCDate() + 'T' d.getUTCHours() + ':' + d.getUTCMinutes() + ':' + d.getUTCSeconds(); } But that gives me "2010-4-2T"

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• iOS Application Background Downloading

  - by Hankweb

  Hey! I need to know how I can have my iOS Application start a download in the background of the application (like, have the download run in the AppDelegate file) so changing ViewControllers will not interrupt or cancel the download. I also need to be able to get the progress of the download (0.00000 - 1.00000), to set a UIProgressView object to, which also means I need a - (void)progressDidChangeTo:(int)progress function.

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• Should I invest time in learning about OR\M or LINQ?

  - by Peter Smith

  I'm a .NET web developer primarily who occasionally writes console applications to mine data, cleanup tasks, etc. Most of what I do winds up involving a database which I currently design via sql server management studio, using stored procedures, and query analyzer. I also create a lot of web services which are consumed via AJAX applications. Do these technologies really help you in speeding up development times? Do you still have to build the database or object code first?

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• jdbc connection pooling

  - by llm

  Can anybody provide examples or links on how to establish a JDBC connection pool? From searching google I see many different ways of doing this and it is rather confusing. Ultimately I need the code to return a java.sql.Connection object, but I am having trouble getting started..any suggestions welcome.

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• How to insert a large number of records quickly using ADO.Net Entity Model?

  - by esac

  I am using the ADO.Net Entity Model. Everytime I create a record, I am calling _entity.AddToTable(object); _entity.SaveChanges(); What is the fastest way of inserting the data? Is there any "batch" or "SqlBulkCopy" option for entity model?

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• Extending the User model with custom fields in Django

  - by Gaurav

  I am trying to extend the User model so that I can add my own custom fields but I keep getting an error stating: 'NoneType' object has no attribute '_default_manager' whenever I try to use user.get_profile() to add values to the custom field i.e. whenever I use it like so: user = User.objects.create_user(username, email, password) user.first_name = fname user.last_name = lname user.save() uinfo = user.get_profile() uinfo.timezone = "Asia/Pune" uinfo.save() I have already followed the steps given at http://stackoverflow.com/questions/44109/extending-the-user-model-with-custom-fields-in-django/965883#965883 with no luck.

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• Write a PLIST file in Groovy

  - by Joe Cannatti

  I have a Groovy application for Windows and am trying to convert a Hash object to an Apple plist file. What is the best way to go about this? Seems like this is something that must already be solved in Java but I can't seem to find any examples. Thanks in advance

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• Spark show logged in user

  - by Jose

  How do I show the username of the person logged in within a Spark View? The default MVC view engine had a Page object that you could get the info from. How would I do that in spark? I know that I could put the info into the viewdata dictionary, which is probably the best, but I don't want to have to write ViewData["User"] = myUser; before I return from EVERY action method. I'd like some feedback

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• XML Schema for a .NET type that inherits and implements

  - by John Ruiz

  Hi, Please consider the following three .NET types: I have an interface, an abstract class, and a concrete class. My question is how to write the XML Schema to include the properties from the interface and from the abstract class. public interface IStartable { bool RequiresKey { get; set; } void Start(object key); } public abstract class Vehicle { uint WheelCount { get; set; } } public class Car : Vehicle, IStartable { public bool RequiresKey { get; set; } public string Make { get; set; } publilc string Model { get; set; } public Car() {} public void Start(object key) { // start car with key } } I don't know how to complete this schema: <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="cars" xmlns="cars" xmlns:c="cars"> <!-- How do I get car to have vehicle's wheelcount AND IStartable's RequiresKey? --> <xs:element name="Car" type="c:Car" /> <xs:complexType name="Car"> <xs:complexContent> <xs:extension base="c:Vehicle"> <xs:group ref=c:CarGroup" /> </xs:extension> </xs:complexContent> </xs:complexType> <xs:group name="CarGroup"> <xs:sequence> <xs:element name="Make" type="xs:token" /> <xs:element name="Model" type="xs:token" /> </xs:sequence> </xs:group> <xs:complexType name="Vehicle"> <xs:sequence> <xs:element name="WheelCount" type="xs:unsignedInt" /> </xs:sequence> </xs:complexType> <xs:complexType name="IStartable"> <xs:sequence> <xs:element name="RequiresKey" type="xs:boolean" /> </xs:sequence> </xs:complexType> </xs:schema>

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• Does this data structure have a name? Sort of a "linked matrix"?

  - by Bob

  Let's say I wanted similar functionality to a doubly linked list but needed a matrix instead so that each node was structured like this: public class Node { Node Up, Down, Left, Right; object Value; } Is there a name for such a structure? I've looked through this Wikipedia listing of data structures but didn't see anything similar. Unless I just missed it.

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• Android - Isn't Eclipse WYSIWYG?

  - by Dada

  Hi at all, i have downloaded Eclipse Galileo and install Android SDK for the first time. I have try to create an simple Userinterface, but i have see that i can't move the "object" directly from the stage. But i need to edit the Code or open the Property panel in order to change the position of an Element on the Stage. Isn't Eclipse WYSIWYG? D.

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• C# Whats the difference between the 'ref' and 'out' keywords

  - by TK

  I'm creating a function where I need to pass an object so that it can be modified by the function. What is the difference between: public void myFunction(ref MyClass someClass) and public void myFunction(out MyClass someClass) Which should I use and why?!

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• class ProfilePresenter < ActionView::Base | url_for doesn't work. why? (*SOLVED*)

  - by Totty

  class ProfilePresenter < ActionView::Base def initialize super url_for # i got: You have a nil object when you didn't expect it! # The error occurred while evaluating nil.url_for end end url_for doesn't work. why? i make a new instance like this ProfilePresenter.new SOLVED: i need to pass the controller instance when i instance the ActionView::Base

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• java background task

  - by markovuksanovic

  I was wondering which would be the most efficient approach to implement some kind of background task in java (I guess that would be some kind of nonblocking Threads). To be more precise - I have some java code and then at some point I need to execute a long running operation. What I would like to do is to execute that operation in the background so that the rest of the program can continue executing and when that task is completed just update some specific object which. This change would be then detected by other components.

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• Who calls the Destructor of the class when operator delete is used in multiple inheritance.

  - by dicaprio-leonard

  This question may sound too silly, however , I don't find concrete answer any where else. With little knowledge on how late binding works and virtual keyword used in inheritance. As in the code sample, when in case of inheritance where a base class pointer pointing to a derived class object created on heap and delete operator is used to deallocate the memory , the destructor of the of the derived and base will be called in order only when the base destructor is declared virtual function. Now my question is : 1) When the destructor of base is not virtual, why the problem of not calling derived dtor occur only when in case of using "delete" operator , why not in the case given below: derived drvd; base *bPtr; bPtr = &drvd; //DTOR called in proper order when goes out of scope. 2) When "delete" operator is used, who is reponsible to call the destructor of the class? The operator delete will have an implementation to call the DTOR ? or complier writes some extra stuff ? If the operator has the implementation then how does it looks like , [I need sample code how this would have been implemented]. 3) If virtual keyword is used in this example, how does operator delete now know which DTOR to call? Fundamentaly i want to know who calls the dtor of the class when delete is used. Sample Code class base { public: base() { cout<<"Base CTOR called"<<endl; } virtual ~base() { cout<<"Base DTOR called"<<endl; } }; class derived:public base { public: derived() { cout<<"Derived CTOR called"<<endl; } ~derived() { cout<<"Derived DTOR called"<<endl; } }; I'm not sure if this is a duplicate, I couldn't find in search. int main() { base *bPtr = new derived(); delete bPtr;// only when you explicitly try to delete an object return 0; }

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• Meaning of Primary Key to Microsoft SQL Server 2008

  - by usr

  What meaning does the concept of a primary key have to the database engine of SQL Server? I don't mean the clustered/nonclustered index created on the "ID" column, i mean the constraint object "primary key". Does it matter if it exists or not? Alternatives: alter table add primary key clustered alter table create clustered index Does it make a difference?

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