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• Oracle ACEs / ACE Directors in the OTN Lounge - JavaOne Latin America 2012

  - by Bob Rhubart

  What's an Oracle ACE? Oracle ACEs and Oracle ACE Directors are community members who have demonstrated both community leadership and expertise with Oracle technologies. You'll get a chance to interact with several Oracle ACEs and Oracle ACE Directors in the mini theater in the OTN Lounge this week during JavaOne Latin America 2012 in São Paulo, Brazil. Tuesday, 4 December 2012 Presentation Presenter Presenter title and company 4:30 – 4:50 Co-existence between Applications' Unlimited and Fusion Applications Gustavo Gonzales, Oracle ACE Director CTO, IT Convergence 4:50 – 5:10 Pipeline Table Functions Marcelo Ochoa, Oracle ACE CTO, Scotas.com 5:10 - 5:30 Automatic Diagnostic Repository (ADR) Day-to-Day Rodrigo Almeida, Oracle ACE CDS - Condomínio de Soluções Corporativas Wednesday, 5 December 2012 Presentation Presenter Presenter title and company 4:30 – 4:50 TBA 4:50 – 5:10 Oracle VM Template - Facilitating the Construction Environment. David Siqueira, Oracle ACE CDS Condominio de Soluções 5:10 – 5:30 Database Migration with Minimal Downtime Marcus Vinicius Miguel Pedro, Oracle ACE Discover

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• How to delegate SwingWorker's publish to other methods

  - by Savvas Dalkitsis

  My "problem" can be described by the following. Assume we have an intensive process that we want to have running in the background and have it update a Swing JProgress bar. The solution is easy: import java.util.List; import javax.swing.JOptionPane; import javax.swing.JProgressBar; import javax.swing.SwingWorker; /** * @author Savvas Dalkitsis */ public class Test { public static void main(String[] args) { final JProgressBar progressBar = new JProgressBar(0,99); SwingWorker<Void, Integer> w = new SwingWorker<Void, Integer>(){ @Override protected void process(List<Integer> chunks) { progressBar.setValue(chunks.get(chunks.size()-1)); } @Override protected Void doInBackground() throws Exception { for (int i=0;i<100;i++) { publish(i); Thread.sleep(300); } return null; } }; w.execute(); JOptionPane.showOptionDialog(null, new Object[] { "Process", progressBar }, "Process", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, null); } } Now assume that i have various methods that take a long time. For instance we have a method that downloads a file from a server. Or another that uploads to a server. Or anything really. What is the proper way of delegating the publish method to those methods so that they can update the GUI appropriately? What i have found so far is this (assume that the method "aMethod" resides in some other package for instance): import java.awt.event.ActionEvent; import java.util.List; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JOptionPane; import javax.swing.JProgressBar; import javax.swing.SwingWorker; /** * @author Savvas Dalkitsis */ public class Test { public static void main(String[] args) { final JProgressBar progressBar = new JProgressBar(0,99); SwingWorker<Void, Integer> w = new SwingWorker<Void, Integer>(){ @Override protected void process(List<Integer> chunks) { progressBar.setValue(chunks.get(chunks.size()-1)); } @SuppressWarnings("serial") @Override protected Void doInBackground() throws Exception { aMethod(new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { publish((Integer)getValue("progress")); } }); return null; } }; w.execute(); JOptionPane.showOptionDialog(null, new Object[] { "Process", progressBar }, "Process", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, null); } public static void aMethod (Action action) { for (int i=0;i<100;i++) { action.putValue("progress", i); action.actionPerformed(null); try { Thread.sleep(300); } catch (InterruptedException e) { e.printStackTrace(); } } } } It works but i know it lacks something. Any thoughts?

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• System.AccessViolation in DllImport method after redeploy

  - by gall

  Hi Everyone, My environment: Windows 2003, VS 2008, .NET 3.5 C# .NET application. During loading my application I call method from C++ dll (Knowl.dll) through my third-party dll library (Common.dll) written in C#. After first deploy (from VS to Developing server) evrything works fine. Then I stops Developing Server, doesn't any changes in code and redeploy. Throws AccessViolationException on this imported method. What is it? On second and after redeplies - the same error. Only after deletin source code and recheckout it from CVS I can normally start server. Dll import: [DllImport("Knowl.dll", EntryPoint = "GetBaseName")] private static extern IntPtr getNameDll(); public static string GetName() { IntPtr p = IntPtr.Zero; p = getNameDll(); return Marshal.PtrToStringUni(p); }

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• Using a SMTP Service for email

  - by Josh S.

  This may be a horribly obvious question, but I'm learning and just need someone to confirm it for me. I putting together a private social network that needs to email their members (through the social network software, Elgg) regularly. I'm hosting it on a shared HostGator plan (because they won't receive much traffic) and they'll email 10-1000 emails a few times a week. HostGator restricts you to 500 per hour. I'm also worried about deliverability. I've been searching up and down about how to throttle the emails so it will all send reliably... but then I came across the idea of an outside SMTP relay service. Would using an SMTP service resolve this issue? If so, any opinions on quality SMTP services?

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• Populate JSP dropdown with database info

  - by Cano63

  I'm looking for the way to populate a JSP dropdown. I want that when the JSP loads it fills the dropdown with the info that I have in a database table. I'm including the code of my class that will create the array and fill it with the database info. What I don't know is how to call that class from my JSP and fill the dropdown. // this will create my array public static ArrayList<DropDownBrands> getBrandsMakes() { ArrayList<DropDownBrands> arrayBrandsMake = new ArrayList<DropDownBrands>(); while (rs.next()) { arrayBrandsMake.add(loadOB(rs)); // CARGO MI ARREGLO CON UN OBJETO } return arrayBrandsMake; } // this will load my array object private static DropDownBrands loadOB(ResultSet rs) throws SQLException { DropDownBrands OB = new DropDownBrands(); OB.setBrands("BRAN"); return OB; }

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• Quercus on Google App Engine: Class not loading

  - by gAMBOOKa

  Fatal Error: no matching class connection index.php <?php import database.connection; $connection = connection::get()->getPersistenceManager(); // ***ERROR HERE*** ?> connection.java package database; import javax.jdo.JDOHelper; import javax.jdo.PersistenceManagerFactory; public final class connection { private static final PersistenceManagerFactory pmfInstance = JDOHelper.getPersistenceManagerFactory("transactions-optional"); private connection() {} public static PersistenceManagerFactory get() { return pmfInstance; } } Quercus is otherwise configured fine, PHP implementation works smoothly on GAE. But when I try to initialize classes, PHP can't find them. What am I doing wrong?

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• Hold The Date: GlassFish Community Event and Party @ JavaOne 2012 - Sep 30

  - by arungupta

  A yearly tradition for the past 5 years (2007, 2008, 2009, 2010, 2011) is back again this year ... GlassFish Community Event is a gathering of GlassFish community members attending JavaOne. GlassFish Party is for everybody who are, or would like to be friends of GlassFish, in and around the San Francisco Bay Area. This year, again, both the events will be happening on the Sunday of JavaOne. The exact coordinates are a TBD but save the date while you are booking flights/hotels. GlassFish Community Event When: Sep 30, 11am - 1pm Where: TBD GlassFish Party When: Sep 30, 8pm - 10pm Where: The Thirsty Bear Note, a separate JavaOne registration is required to attend the community event. The party is open to everybody, and no JavaOne registration is required. RSVP details are still being worked upon and will be shared soon. 10 reasons to attend these events allows you to build your case with the management :-)

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• Detect Client Computer name when an RDP session is open

  - by Ubiquitous Che

  Hey all, My manager has pointed out to me a few nifty things that one of our accounting applications can do because it can load different settings based on the machine name of the host and the machine name of the client when the package is opened in an RDP session. We want to provide similar functionality in one of my company's applications. I've found out on this site how to detect if I'm in an RDP session, but I'm having trouble finding information anywhere on how to detect the name of the client computer. Any pointers in the right direction would be great. I'm coding in C# for .NET 3.5 EDIT The sample code I cobbled together from the advice below - it should be enough for anyone who has a use for the WTSQuerySessionInformation to get a feel for what's going on. Note that this isn't necessarily the best way of doing it - just a starting point that I've found useful. When I run this locally, I get boring, expected answers. When I run it on our local office server in an RDP session, I see my own computer name in the WTSClientName property. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; namespace TerminalServicesTest { class Program { const int WTS_CURRENT_SESSION = -1; static readonly IntPtr WTS_CURRENT_SERVER_HANDLE = IntPtr.Zero; static void Main(string[] args) { StringBuilder sb = new StringBuilder(); uint byteCount; foreach (WTS_INFO_CLASS item in Enum.GetValues(typeof(WTS_INFO_CLASS))) { Program.WTSQuerySessionInformation( WTS_CURRENT_SERVER_HANDLE, WTS_CURRENT_SESSION, item, out sb, out byteCount); Console.WriteLine("{0}({1}): {2}", item.ToString(), byteCount, sb); } Console.WriteLine(); Console.WriteLine("Press any key to exit..."); Console.ReadKey(); } [DllImport("Wtsapi32.dll")] public static extern bool WTSQuerySessionInformation( IntPtr hServer, int sessionId, WTS_INFO_CLASS wtsInfoClass, out StringBuilder ppBuffer, out uint pBytesReturned); } enum WTS_INFO_CLASS { WTSInitialProgram = 0, WTSApplicationName = 1, WTSWorkingDirectory = 2, WTSOEMId = 3, WTSSessionId = 4, WTSUserName = 5, WTSWinStationName = 6, WTSDomainName = 7, WTSConnectState = 8, WTSClientBuildNumber = 9, WTSClientName = 10, WTSClientDirectory = 11, WTSClientProductId = 12, WTSClientHardwareId = 13, WTSClientAddress = 14, WTSClientDisplay = 15, WTSClientProtocolType = 16, WTSIdleTime = 17, WTSLogonTime = 18, WTSIncomingBytes = 19, WTSOutgoingBytes = 20, WTSIncomingFrames = 21, WTSOutgoingFrames = 22, WTSClientInfo = 23, WTSSessionInfo = 24, WTSSessionInfoEx = 25, WTSConfigInfo = 26, WTSValidationInfo = 27, WTSSessionAddressV4 = 28, WTSIsRemoteSession = 29 } }

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• Android NDK Question

  - by Kyle

  The NDK does not contain very many shared libraries for you to access. As a result, I must build many sources myself and link them into my shared library via static/shared libraries. I want to compile libpng as a Static Library. Trouble is, I have absolutely no idea how, nor does google instruct you how to do so in their NDK. I'm no expert on the NDK even after reading everything I can find, so I would really appreciate someone who actually knows how this is done. I do have the Android.mk file for libpng, as google's Android OS source contains it. Infact, I got the entire directory on the android OS source for libpng and it's dependent libraries. It was somewhat of a shortcut instead of making one myself. I don't know how to make a particular directory which contains this file, though. Thanks for reading!

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• How can a student programmer improve his teamwork skill?

  - by xiao

  I am a student right now. Recently, I am working in a project as a leader with three other students. Due to the lack of experience, our project is progressing slowly and our members are frustrated. They do not feel sense of accomplishment in the project. I am pressured and frustrated, too. But as a team leader, I think I need to push them. But I do not know how to do. Do I help them solve coding problem or just encouragement? But if I pay too much attention on it, it would slow down my own progress. It is a not technical question, but it is very common in software development. I hope veteran programmers would give me some suggestions. Thanks!

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• tripledes encryption not yielding same results in PHP and C#

  - by Jones

  When I encrypt with C# I get arTdPqWOg6VppOqUD6mGITjb24+x5vJjfAufNQ4DN7rVEtpDmhFnMeJGg4n5y1BN static void Main(string[] args) { Encoding byteEncoder = Encoding.Default; String key = "ShHhd8a08JhJiho98ayslcjh"; String message = "Let us meet at 9 o'clock at the secret place."; String encryption = Encrypt(message, key, false); String decryption = Decrypt(encryption , key, false); Console.WriteLine("Message: {0}", message); Console.WriteLine("Encryption: {0}", encryption); Console.WriteLine("Decryption: {0}", decryption); } public static string Encrypt(string toEncrypt, string key, bool useHashing) { byte[] keyArray; byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt); if (useHashing) { MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider(); keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key)); } else keyArray = UTF8Encoding.UTF8.GetBytes(key); TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); tdes.Key = keyArray; tdes.Mode = CipherMode.ECB; tdes.Padding = PaddingMode.PKCS7; ICryptoTransform cTransform = tdes.CreateEncryptor(); byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return Convert.ToBase64String(resultArray, 0, resultArray.Length); } public static string Decrypt(string toDecrypt, string key, bool useHashing) { byte[] keyArray; byte[] toEncryptArray = Convert.FromBase64String(toDecrypt); if (useHashing) { MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider(); keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key)); } else keyArray = UTF8Encoding.UTF8.GetBytes(key); TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); tdes.Key = keyArray; tdes.Mode = CipherMode.ECB; tdes.Padding = PaddingMode.PKCS7; ICryptoTransform cTransform = tdes.CreateDecryptor(); byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length); return UTF8Encoding.UTF8.GetString(resultArray); } When I encrypt with PHP I get: arTdPqWOg6VppOqUD6mGITjb24+x5vJjfAufNQ4DN7rVEtpDmhFnMVM+W/WFlksR <?php $key = "ShHhd8a08JhJiho98ayslcjh"; $input = "Let us meet at 9 o'clock at the secret place."; $td = mcrypt_module_open('tripledes', '', 'ecb', ''); $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND); mcrypt_generic_init($td, $key, $iv); $encrypted_data = mcrypt_generic($td, $input); mcrypt_generic_deinit($td); mcrypt_module_close($td); echo base64_encode($encrypted_data); ?> I don't know enough about cryptography to figure out why. Any ideas? Thanks.

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• load/unload C dll with C# problems

  - by Goran

  I'm having problems with external native DLL. I'm working on ASP.NET 1.1 web application and have this DLL which I load through DLLImport directives. This is how I map DLL functions: [DllImport("somedllname", CallingConvention=CallingConvention.StdCall)] public static extern int function1(string lpFileName,string lpOwnerPw,string lpUserPw); [DllImport("somedllname", CallingConvention=CallingConvention.StdCall)] public static extern int function2(int nHandle); I call the dll methods and all works great, but I have problems with this DLL crashing my web site on some cases, so I would like an option to unload the dll after I use it. I found a solution at this link, but I don't have 'UnmanagedFunctionPointer' attribute in .NET 1.1 available. http://blogs.msdn.com/jonathanswift/archive/2006/10/03/Dynamically-calling-an-unmanaged-dll-from-.NET-_2800_C_23002900_.aspx Is there a way I can achieve what this guy did with his example?

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• Apress Deal of the day - 6/Feb/2011 - Ultra-Fast ASP.NET: Building Ultra-Fast and Ultra-Scalable Websites Using ASP.NET and SQL Server

  - by TATWORTH

  Today's $10 deal of the day at http://www.apress.com/info/dailydeal  is Ultra-Fast ASP.NET: Building Ultra-Fast and Ultra-Scalable Websites Using ASP.NET and SQL Server by Richard Kessig - ISBN 978-1-4302-2383-2 I won a copy of this book at 101 Books. Richard Kessig is an all-star member of forums.asp.net - see http://forums.asp.net/members/RickNZ.aspx " Ultra-Fast ASP.NET provides a practical guide to building extremely fast and scalable web sites using ASP.NET and SQL Server. It strikes a balance between imparting usable advice and backing that advice up with supporting background information. $49.99 | Published Nov 2009 | Rick Kiessig"

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• Custom ASP.NET MVC cache controllers in a shared hosting environment?

  - by Daniel Crenna

  I'm using custom controllers that cache static resources (CSS, JS, etc.) and images. I'm currently working with a hosting provider that has set me up under a full trust profile. Despite being in full trust, my controllers fail because the caching strategy relies on the File class to directly open a resource file prior to treatment and storage in memory. Is this something that would likely occur in all full trust shared hosting environments or is this specific to my host? The static files live within my application's structure and not in an arbitrary server path. It seems to me that custom caching would require code to access the file directly, and am hoping someone else has dealt with this issue.

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• Topics for development team cross training sessions

  - by BBlake

  Our team of developers are going to start holding monthly meetings for the purposes of cross training and knowledge improvement. We're looking for ideas for topics to discuss. We've already made a list of some obvious ones, such as discussions/training on specific applications, proper usage of TFS for source control, bug tracking and code reviews, coding standards, and corporate architecture. The problem we're having is that we are a cross-platform development team so we don't want to look at topics that only apply to certain members of the team (Sql, .NET, reporting, third party apps, etc). We'll use sub-team meetings for those. So what other topics that would apply across a broad development team would be good for these training sessions?

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• Oracle Exalogic Elastic Cloud - Planned Webcasts

  - by chuck.speaks

  I’m putting together a collection of recorded webcasts around Oracle Exalogic Elastic Cloud (Exalogic).  The plan is to do a systems overview and then multiple deep dives into hardware and software components that make up the engineered system. Those of you that are members of our partner community (Oracle Partner Network), drop me a note if you are interested in a full blown in-class delivery via PTS resources.  There is no schedule for these workshops but if there is enough interest, I would venture to guess it would roll out soon. Those of you with applications certified on Oracle WebLogic server that would like to scale to Exalogic, see me or watch this space.   Chuck Speaks chuck <dot> speaks at oracle <dot> com

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• Groovy MetaClass - Add category methods to appropriate metaClasses

  - by noah

  I have several categories that I use in my Grails plugin. e.g., class Foo { static foo(ClassA a,Object someArg) { ... } static bar(ClassB b,Object... someArgs) { ... } } I'm looking for the best way to add these methods to the meta-classes so that I don't have to use the category classes and can just invoke them as instance methods. e.g., aInstance.foo(someArg) bInstance.bar(someArgs) Is there a Groovy/Grails class or method that will help me do this or am I stuck iterating through the methods and adding them all myself?

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• adding tabs to tabcontrol from inside usercontrol

  - by Jakob

  How can I add tabs to a tabcontrol that exists in one usercontrol from another usercontrol that is contained within a tab itself?? Can I do it without passing in the tabcontrol as a parameter in the constructor, perhaps via some static global method? I've tried public static ObservableTabCollection FindCollectionFromUC(this DependencyObject depObject) { bool loop = true; var parent = (VisualTreeHelper.GetParent(depObject) as FrameworkElement); while (loop) { if (parent.GetType() is TabControl) { loop = false; return ((ObservableTabCollection)((TabControl)parent).ItemsSource); } } return null; } but this is just an infinite loop

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• How should Application.Run() be called for the main presenter of a MVP WinForms app?

  - by Mr Roys

  I'm learning to apply MVP to a simple WinForms app (only one form) in C# and encountered an issue while creating the main presenter in static void Main(). Is it a good idea to expose a View from the Presenter in order to supply it as a parameter to Application.Run()? Currently, I've implemented an approach which allows me to not expose the View as a property of Presenter: static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); presenter.Start(); Application.Run(); } The Start and Stop methods in Presenter: public void Start() { view.Start(); } public void Stop() { view.Stop(); } The Start and Stop methods in View (a Windows Form): public void Start() { this.Show(); } public void Stop() { // only way to close a message loop called // via Application.Run(); without a Form parameter Application.Exit(); } The Application.Exit() call seems like an inelegant way to close the Form (and the application). The other alternative would be to expose the View as a public property of the Presenter in order to call Application.Run() with a Form parameter. static void Main() { IView view = new View(); Model model = new Model(); Presenter presenter = new Presenter(view, model); Application.Run(presenter.View); } The Start and Stop methods in Presenter remain the same. An additional property is added to return the View as a Form: public void Start() { view.Start(); } public void Stop() { view.Stop(); } // New property to return view as a Form for Application.Run(Form form); public System.Windows.Form View { get { return view as Form(); } } The Start and Stop methods in View (a Windows Form) would then be written as below: public void Start() { this.Show(); } public void Stop() { this.Close(); } Could anyone suggest which is the better approach and why? Or there even better ways to resolve this issue?

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• Wearables and UX Innovation: En Español y Inglés

  - by ultan o'broin

  Good examples of Oracle's commitment to tech diversity and to innovation can be seen everywhere. Here's a couple of videos from the Oracle Applications User Experience (UX) team, featuring Sarahi Mireles (@sarahimireles) and Noel Portugal (@noelportugal) who work together on some very cool stuff. The videos are available on the Oracle Technology Network Architecture (OTNArchBeat) Community Video Channel on YouTube. Sarahi and Noel show you how cool people work together on some awesome innovations, worldwide. Sarahi Mireles showing off a Spanish language Pebble watch Facebook notification. The videos are in Spanish and English and feature the latest in wearable technology that the UX team is exploring and that UX team members themselves love to use. Check out what they have to say in your preferred language. Manos libres y vista al frente: Con el futuro puesto Heads Up and Hands Free: Wearing the Future Interested in knowing more or joining us? Find out more on Facebook about the Oracle Applications User Experience team and the Oracle Mexico Development Center.

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• Which are the cons of using only non-member functions and POD?

  - by Miro

  I'm creating my own game engine. I've read these articles and this question about DOD and it was written to not use member functions and classes. I also heard some criticism to this idea. I can write it using member functions or non-member functions it would be similar. So what are the benefits/cons of that approach or when the project grows, does any of these approaches give clearer and better manageable code? With POD & non-member functions I don't have to make struct members public I can still use object id outside of engine like OpenGL does with all it's stuff, so It's not about encapsulation. POD - plain old data DOD - data oriented design

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• Contracts vs Exceptions

  - by devoured elysium

  Let's assume I have the following code: public class MainClass { public static void main(String[] args) { System.out.println(sumNumbers(10, 10)); } //@requires a >= 10; //@ensures \result < 0; public static int sumNumbers(int a, int b) { return a+b; } } I can make 2 things here: Use Code Contracts (in this case, what is in comments). When sumNumbers is run and a < 10, it will throw immediatly an exception (although it doesn't seem to be very descriptive): Exception in thread "main" org.jmlspecs.jmlrac.runtime.JMLInternalNormalPostconditionError: by method MainClass.sumNumbers at MainClass.sumNumbers(MainClass.java:500) at MainClass.internal$main(MainClass.java:9) at MainClass.main(MainClass.java:286) or... Throw an exception. The exception can be as descriptive as I want. I'd also to check in the end of the function to see whenever the post conditions are true or not. Which would you use here and why?

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• How to convincing Programmers that 'being in the zone' [coding] isn't always beneficial for the project?

  - by hawkeye

  In this book review: http://books.slashdot.org/story/11/06/13/1251216/Book-Review-The-Clean-Coder?utm_source=slashdot&utm_medium=twitter Chapter 4 talks about the coding process itself. One of the hardest statements the book makes here is to stay out of "the zone" when coding. Bob asserts that you lose parts of the big picture when you go down to that level. While I may struggle with that assertion, I do agree with his next statement that debugging time is expensive, so you should avoid having to do debugger-driven development whenever possible. He finishes the chapter with examples of pacing yourself (walking away, taking a shower) and how to deal with being late on your projects (remembering that hope is not a plan, and being clear about the impact of overtime) along with a reminder that it is good to both give and receive help, whether it be small questions or mentoring others. they talk about how 'being in the zone' - can actually be detrimental to the project. How do you convince your team members that this is the case?

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• How to make a UserControl with a custom DefaultBackColor?

  - by Blorgbeard

  When I right-click on my custom UserControl's BackColor property in the property-grid, then click Reset, I would like the BackColor property to change to (for example) Color.LightGreen, and the property value to appear un-bolded, to indicate that it is the default value. Currently, I know I can do this: public override void ResetBackColor() { BackColor = Color.LightGreen; } Which works as far as setting it to LightGreen on reset. But it still appears bolded in the property-grid, indicating that the current value is not the default. I notice that the Control class has a static read-only property, DefaultBackColor. Unfortunately, since it's static, I cannot override it. Is there some way to get all the functionality I want?

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• How to add correct cancellation when downloading a file with the example in the samples of the new P

  - by Mike

  Hello everybody, I have downloaded the last samples of the Parallel Programming team, and I don't succeed in adding correctly the possibility to cancel the download of a file. Here is the code I ended to have: var wreq = (HttpWebRequest)WebRequest.Create(uri); // Fire start event DownloadStarted(this, new DownloadStartedEventArgs(remoteFilePath)); long totalBytes = 0; wreq.DownloadDataInFileAsync(tmpLocalFile, cancellationTokenSource.Token, allowResume, totalBytesAction => { totalBytes = totalBytesAction; }, readBytes => { Log.Debug("Progression : {0} / {1} => {2}%", readBytes, totalBytes, 100 * (double)readBytes / totalBytes); DownloadProgress(this, new DownloadProgressEventArgs(remoteFilePath, readBytes, totalBytes, (int)(100 * readBytes / totalBytes))); }) .ContinueWith( (antecedent ) => { if (antecedent.IsFaulted) Log.Debug(antecedent.Exception.Message); //Fire end event SetEndDownload(antecedent.IsCanceled, antecedent.Exception, tmpLocalFile, 0); }, cancellationTokenSource.Token); I want to fire an end event after the download is finished, hence the ContinueWith. I slightly changed the code of the samples to add the CancellationToken and the 2 delegates to get the size of the file to download, and the progression of the download: return webRequest.GetResponseAsync() .ContinueWith(response => { if (totalBytesAction != null) totalBytesAction(response.Result.ContentLength); response.Result.GetResponseStream().WriteAllBytesAsync(filePath, ct, resumeDownload, progressAction).Wait(ct); }, ct); I had to add the call to the Wait function, because if I don't, the method exits and the end event is fired too early. Here are the modified method extensions (lot of code, apologies :p) public static Task WriteAllBytesAsync(this Stream stream, string filePath, CancellationToken ct, bool resumeDownload = false, Action<long> progressAction = null) { if (stream == null) throw new ArgumentNullException("stream"); // Copy from the source stream to the memory stream and return the copied data return stream.CopyStreamToFileAsync(filePath, ct, resumeDownload, progressAction); } public static Task CopyStreamToFileAsync(this Stream source, string destinationPath, CancellationToken ct, bool resumeDownload = false, Action<long> progressAction = null) { if (source == null) throw new ArgumentNullException("source"); if (destinationPath == null) throw new ArgumentNullException("destinationPath"); // Open the output file for writing var destinationStream = FileAsync.OpenWrite(destinationPath); // Copy the source to the destination stream, then close the output file. return CopyStreamToStreamAsync(source, destinationStream, ct, progressAction).ContinueWith(t => { var e = t.Exception; destinationStream.Close(); if (e != null) throw e; }, ct, TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Current); } public static Task CopyStreamToStreamAsync(this Stream source, Stream destination, CancellationToken ct, Action<long> progressAction = null) { if (source == null) throw new ArgumentNullException("source"); if (destination == null) throw new ArgumentNullException("destination"); return Task.Factory.Iterate(CopyStreamIterator(source, destination, ct, progressAction)); } private static IEnumerable<Task> CopyStreamIterator(Stream input, Stream output, CancellationToken ct, Action<long> progressAction = null) { // Create two buffers. One will be used for the current read operation and one for the current // write operation. We'll continually swap back and forth between them. byte[][] buffers = new byte[2][] { new byte[BUFFER_SIZE], new byte[BUFFER_SIZE] }; int filledBufferNum = 0; Task writeTask = null; int readBytes = 0; // Until there's no more data to be read or cancellation while (true) { ct.ThrowIfCancellationRequested(); // Read from the input asynchronously var readTask = input.ReadAsync(buffers[filledBufferNum], 0, buffers[filledBufferNum].Length); // If we have no pending write operations, just yield until the read operation has // completed. If we have both a pending read and a pending write, yield until both the read // and the write have completed. yield return writeTask == null ? readTask : Task.Factory.ContinueWhenAll(new[] { readTask, writeTask }, tasks => tasks.PropagateExceptions()); // If no data was read, nothing more to do. if (readTask.Result <= 0) break; readBytes += readTask.Result; if (progressAction != null) progressAction(readBytes); // Otherwise, write the written data out to the file writeTask = output.WriteAsync(buffers[filledBufferNum], 0, readTask.Result); // Swap buffers filledBufferNum ^= 1; } } So basically, at the end of the chain of called methods, I let the CancellationToken throw an OperationCanceledException if a Cancel has been requested. What I hoped was to get IsFaulted == true in the appealing code and to fire the end event with the canceled flags and the correct exception. But what I get is an unhandled exception on the line response.Result.GetResponseStream().WriteAllBytesAsync(filePath, ct, resumeDownload, progressAction).Wait(ct); telling me that I don't catch an AggregateException. I've tried various things, but I don't succeed to make the whole thing work properly. Does anyone of you have played enough with that library and may help me? Thanks in advance Mike

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