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• Allen for Umbraco with location EXIF meta data

  - by Vizioz Limited

  The latest version of Allen for Umbraco has now hit the Apple App store, we have managed to add some nice improvements to this version that include:Storing location and direction information when photos are taken within the AppEmbedding EXIF data into the images when they are uploadBackground UploadingPull to refresh the media tree Location and DirectionBy default when the camera is used within an application the location and direction that the camera is pointing is not stored within the image meta data. We have now added full support so that this data is now added. We have added a setting which allows you to prevent this data from being uploaded to your website if you do not want the location data to be sent you can turn it off within Allen, Note: Please don't forget that location services do need to be turned on to allow the app to access the images in the phone's asset library.We have had quite a few ideas from users already for using this location data, including logging free parking in Denmark to geo-tagging holiday photos and linking the photos to Google street view. Embedding EXIF dataWe now embed all the meta data available on the iPhone into the image when it is uploaded to your server, this allows you to pull the data out and use it within your site. Have a look at Cultiv's Photo Meta Data package for great example code that allows you to automatically pull this data out and populate properties on your Umbraco media item.We slightly modified the source code of this package to allow the package to always extract the image data, as the default package requires a property to allow the data to be extracted, it's an easy change, if you get stuck add a comment to this post. Background UploadingIf you try to upload multiple images and need to start doing something else on your phone, you can now click the home button and the application will continue to upload your images in the background. As soon as it has finished you will receive a standard Apple notification. Pull to RefreshOur final enhancement has been to add "Pull to refresh" to the media trees, just pull the tree downwards with your finger and it will refresh, this is useful if you are adding items to your media tree while testing your site with Allen for Umbraco. Future enhancements.. your ideas?If you have any ideas for future enhancement feel free to add a comment below!

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• How to use Bouncy Castle lightweight API with AES and PBE

  - by Adrian

  I have a block of ciphertext that was created using the JCE algorithim "PBEWithSHA256And256BitAES-CBC-BC". The provider is BouncyCastle. What I'd like to do it decrypt this ciphertext using the BouncyCastle lightweight API. I don't want to use JCE because that requires installing the Unlimited Strength Jurisdiction Policy Files. Documentation seems to be thin on the ground when it comes to using BC with PBE and AES. Here's what I have so far. The decryption code runs without exception but returns rubbish. The encryption code, String password = "qwerty"; String plainText = "hello world"; byte[] salt = generateSalt(); byte[] cipherText = encrypt(plainText, password.toCharArray(), salt); private static byte[] generateSalt() throws NoSuchAlgorithmException { byte salt[] = new byte[8]; SecureRandom saltGen = SecureRandom.getInstance("SHA1PRNG"); saltGen.nextBytes(salt); return salt; } private static byte[] encrypt(String plainText, char[] password, byte[] salt) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException { Security.addProvider(new BouncyCastleProvider()); PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 20); PBEKeySpec pbeKeySpec = new PBEKeySpec(password); SecretKeyFactory keyFac = SecretKeyFactory.getInstance("PBEWithSHA256And256BitAES-CBC-BC"); SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec); Cipher encryptionCipher = Cipher.getInstance("PBEWithSHA256And256BitAES-CBC-BC"); encryptionCipher.init(Cipher.ENCRYPT_MODE, pbeKey, pbeParamSpec); return encryptionCipher.doFinal(plainText.getBytes()); } The decryption code, byte[] decryptedText = decrypt(cipherText, password.getBytes(), salt); private static byte[] decrypt(byte[] cipherText, byte[] password, byte[] salt) throws DataLengthException, IllegalStateException, InvalidCipherTextException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException { BlockCipher engine = new AESEngine(); CBCBlockCipher cipher = new CBCBlockCipher(engine); PKCS5S1ParametersGenerator keyGenerator = new PKCS5S1ParametersGenerator(new SHA256Digest()); keyGenerator.init(password, salt, 20); CipherParameters keyParams = keyGenerator.generateDerivedParameters(256); cipher.init(false, keyParams); byte[] decryptedBytes = new byte[cipherText.length]; int numBytesCopied = cipher.processBlock(cipherText, 0, decryptedBytes, 0); return decryptedBytes; }

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• Using James Server in Eclipse With JavaMail

  - by Jack Sparrow

  Would anyone be able to tell me how I can go about using James server as my server with Java in Eclipse? I'm trying to test the two classes posted below but i get the following error: Exception in thread "main" javax.mail.AuthenticationFailedException: Authentication failed. public class JamesConfigTest { public static void main(String[] args) throws Exception { // CREATE CLIENT INSTANCES MailClient redClient = new MailClient("red", "localhost"); MailClient greenClient = new MailClient("green", "localhost"); MailClient blueClient = new MailClient("blue", "localhost"); // CLEAR EVERYBODY'S INBOX redClient.checkInbox(MailClient.CLEAR_MESSAGES); greenClient.checkInbox(MailClient.CLEAR_MESSAGES); blueClient.checkInbox(MailClient.CLEAR_MESSAGES); Thread.sleep(500); // Let the server catch up // SEND A COUPLE OF MESSAGES TO BLUE (FROM RED AND GREEN) redClient.sendMessage( "blue@localhost", "Testing blue from red", "This is a test message"); greenClient.sendMessage( "blue@localhost", "Testing blue from green", "This is a test message"); Thread.sleep(500); // Let the server catch up // LIST MESSAGES FOR BLUE (EXPECT MESSAGES FROM RED AND GREEN) blueClient.checkInbox(MailClient.SHOW_AND_CLEAR); } } import java.io.*; import java.util.*; import javax.mail.*; import javax.mail.internet.*; public class MailClient extends Authenticator { public static final int SHOW_MESSAGES = 1; public static final int CLEAR_MESSAGES = 2; public static final int SHOW_AND_CLEAR = SHOW_MESSAGES + CLEAR_MESSAGES; protected String from; protected Session session; protected PasswordAuthentication authentication; public MailClient(String user, String host) { this(user, host, false); } public MailClient(String user, String host, boolean debug) { from = user + '@' + host; authentication = new PasswordAuthentication(user, user); Properties props = new Properties(); props.put("mail.user", user); props.put("mail.host", host); props.put("mail.debug", debug ? "true" : "false"); props.put("mail.store.protocol", "pop3"); props.put("mail.transport.protocol", "smtp"); session = Session.getInstance(props, this); } public PasswordAuthentication getPasswordAuthentication() { return authentication; } public void sendMessage( String to, String subject, String content) throws MessagingException { System.out.println("SENDING message from " + from + " to " + to); System.out.println(); MimeMessage msg = new MimeMessage(session); msg.addRecipients(Message.RecipientType.TO, to); msg.setSubject(subject); msg.setText(content); Transport.send(msg); } public void checkInbox(int mode) throws MessagingException, IOException { if (mode == 0) return; boolean show = (mode & SHOW_MESSAGES) > 0; boolean clear = (mode & CLEAR_MESSAGES) > 0; String action = (show ? "Show" : "") + (show && clear ? " and " : "") + (clear ? "Clear" : ""); System.out.println(action + " INBOX for " + from); Store store = session.getStore(); store.connect(); Folder root = store.getDefaultFolder(); Folder inbox = root.getFolder("inbox"); inbox.open(Folder.READ_WRITE); Message[] msgs = inbox.getMessages(); if (msgs.length == 0 && show) { System.out.println("No messages in inbox"); } for (int i = 0; i < msgs.length; i++) { MimeMessage msg = (MimeMessage)msgs[i]; if (show) { System.out.println(" From: " + msg.getFrom()[0]); System.out.println(" Subject: " + msg.getSubject()); System.out.println(" Content: " + msg.getContent()); } if (clear) { msg.setFlag(Flags.Flag.DELETED, true); } } inbox.close(true); store.close(); System.out.println(); } }

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• Free Video Training: ASP.NET MVC 3 Features

  - by ScottGu

  A few weeks ago I blogged about a great ASP.NET MVC 3 video training course from Pluralsight that was made available for free for 48 hours for people to watch.  The feedback from the people that had a chance to watch it was really fantastic.  We also received feedback from people who really wanted to watch it – but unfortunately weren’t able to within the 48 hour window. The good news is that we’ve worked with Pluralsight to make the course available for free again until March 18th.  You can watch any of the course modules for free, through March 18th, on the www.asp.net/mvc website here: The 6 videos in this course are a total of 3 hours and 17 minutes long, and provide a nice overview of the new features introduced with ASP.NET MVC 3 including: Razor, Unobtrusive JavaScript, Richer Validation, ViewBag, Output Caching, Global Action Filters, NuGet, Dependency Injection, and much more.  Scott Allen is the presenter, and the format, video player, and cadence of the course is really excellent. It provides a great way to quickly come up to speed with all of the new features introduced with the new ASP.NET MVC 3 release. Introductory ASP.NET MVC 3 course also coming soon The above course provides a good way for people already familiar with ASP.NET MVC to quickly learn the new features in the V3 release. Pluralsight is also working on a new introductory ASP.NET MVC 3 course series designed for developers who are brand new to ASP.NET MVC, and who want an end to end training curriculum on how to come up to speed with it.  It will cover all of the basics of ASP.NET MVC (including the new Razor view engine), how to use EF code first for data access, using JavaScript/AJAX with MVC, security scenarios with MVC, unit testing applications, deploying applications, and more. I’m excited to pre-announce that we’ll also make this new introductory series free on the www.asp.net/mvc web-site for anyone to watch. I’ll do another blog post linking to it once it is live and available. Hope this helps, Scott

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• How to disable maximize button in a WPF appication page not in a window

  - by Lukman

  I want to disable the maximize button in WPF application page, not in a WPF application window When I searched in Google, it is available methods for disabling the maximize button in WPF window The code snippet is as follows Window.WindowStyle= WindowStyle.None But is not working in WPF page It is showing errors. In WPF page there is WindowStyleProperty instead of WindowStyle and it is showing errors as Error 1:A static readonly field cannot be assigned to (except in a static constructor or a variable initializer) Error 2: Cannot implicitly convert type 'System.Windows.WindowStyle' to 'System.Windows.DependencyProperty' So how can I disable the maximize button in WPF page Then how can I implement it Suggest me any sample code snippet.... Advance thanks.........

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• Using Monitor Class

  - by Mubashar Ahmad

  Dear All I would like to ask couple of Questions regarding the use of Monitor Class in .Net. To understand the Questions please look at the following Code. public class MyClass { private List<int> _MyCollection = new List<int>(); public void GetLock() { Monitor.Enter(_MyCollection); } public void ReleaseLock() { Monitor.Exit(_MyCollection); } public void UpdateCollection(/*anyparam*/) { //update collection without lock on collection } } public class MyAppMain { private static MyClass myclass = new MyClass(); public static void main(args) { try { myclass.GetLock(); //an operation that does not do any update on myclass but wanted //to ensure that the collection within myclass never update //while its doing following opetion //Do somthing } finally { myclass.ReleaseLock(); } } } Now is this the right use of monitor and do i need to use Pulse or PulseAll to signal waiting thread and if so than should use plus before or after Exit function? Regards Mubashar

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• Nested/Child TransactionScope Rollback

  - by Robert Wagner

  I am trying to nest TransactionScopes (.net 4.0) as you would nest Transactions in SQL Server, however it looks like they operate differently. I want my child transactions to be able to rollback if they fail, but allow the parent transaction to decide whether to commit/rollback the whole operation. A greatly simplified example of what I am trying to do: static void Main(string[] args) { using(var scope = new TransactionScope()) // Trn A { // Insert Data A DoWork(true); DoWork(false); // Rollback or Commit } } // This class is a few layers down static void DoWork(bool fail) { using(var scope = new TransactionScope()) // Trn B { // Update Data A if(!fail) { scope.Complete(); } } } I can't use the Suppress or RequiresNew options as Trn B relies on data inserted by Trn A. If I do use those options, Trn B is blocked by Trn A. Any ideas how I would get it to work, or if it is even possible using the System.Transactions namespace? Thanks

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• populate jsp drop down with database info

  - by Cano63

  Hello, people, i,m looking for the way to populate a jsp dropdown. I want that when the jsp load it fill the dropdown with the info that i have in a database table. Down I,m icluding the code of my class that will create the array and fill it with the database info. Whant 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 getBrandsMakes() { ArrayList arrayBrandsMake = new ArrayList(); 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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• Why is code quality not popular?

  - by Peter Kofler

  I like my code being in order, i.e. properly formatted, readable, designed, tested, checked for bugs, etc. In fact I am fanatic about it. (Maybe even more than fanatic...) But in my experience actions helping code quality are hardly implemented. (By code quality I mean the quality of the code you produce day to day. The whole topic of software quality with development processes and such is much broader and not the scope of this question.) Code quality does not seem popular. Some examples from my experience include Probably every Java developer knows JUnit, almost all languages implement xUnit frameworks, but in all companies I know, only very few proper unit tests existed (if at all). I know that it's not always possible to write unit tests due to technical limitations or pressing deadlines, but in the cases I saw, unit testing would have been an option. If a developer wanted to write some tests for his/her new code, he/she could do so. My conclusion is that developers do not want to write tests. Static code analysis is often played around in small projects, but not really used to enforce coding conventions or find possible errors in enterprise projects. Usually even compiler warnings like potential null pointer access are ignored. Conference speakers and magazines would talk a lot about EJB3.1, OSGI, Cloud and other new technologies, but hardly about new testing technologies or tools, new static code analysis approaches (e.g. SAT solving), development processes helping to maintain higher quality, how some nasty beast of legacy code was brought under test, ... (I did not attend many conferences and it propably looks different for conferences on agile topics, as unit testing and CI and such has a higer value there.) So why is code quality so unpopular/considered boring? EDIT: Thank your for your answers. Most of them concern unit testing (and has been discussed in a related question). But there are lots of other things that can be used to keep code quality high (see related question). Even if you are not able to use unit tests, you could use a daily build, add some static code analysis to your IDE or development process, try pair programming or enforce reviews of critical code.

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• Vertically split variable-sized div using CSS

  - by Martijn

  I'm trying to divide an auto-scaling div into two vertically using two other div's. What I have so far: <div id='wrapper'> <div id='left'>some stuff</div> <div id='right'>more stuff</div> </div> with #frame { position: static; width: 1000px; height: auto; /* more positioning stuff */ } #left { position: absolute; width: 200px; height: 100%; } #right { position: static; margin-left: 200px; } This seems to work OK, except if the contents of #right are higher than those of #left. In this case, part of the contents of left are invisible. How can I make sure that the height of the left div is also taken into account when the needed height of #wrapper is calculated?

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• Handling exception from unmanaged dll in C#

  - by StuffHappens

  Hello. I have the following function written in C# public static string GetNominativeDeclension(string surnameNamePatronimic) { if(surnameNamePatronimic == null) throw new ArgumentNullException("surnameNamePatronimic"); IntPtr[] ptrs = null; try { ptrs = StringsToIntPtrArray(surnameNamePatronimic); int resultLen = MaxResultBufSize; int err = decGetNominativePadeg(ptrs[0], ptrs[1], ref resultLen); ThrowException(err); return IntPtrToString(ptrs, resultLen); } catch { return surnameNamePatronimic; } finally { FreeIntPtr(ptrs); } } Function decGetNominativePadeg is in unmanaged dll [DllImport("Padeg.dll", EntryPoint = "GetNominativePadeg")] private static extern Int32 decGetNominativePadeg(IntPtr surnameNamePatronimic, IntPtr result, ref Int32 resultLength); and throws an exception: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. The catch that is in C# code doesn't actually catch it. Why? How to handle this exception? Thank you for your help!

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• DotNetOpenAuth: Mock ClaimsResponse

  - by Pickels

  Hello, I was wondering how I can mock the ClaimseReponse class in DotNetOpenAuth? This is the class(remove a few properties): [Serializable] public sealed class ClaimsResponse : ExtensionBase, IClientScriptExtensionResponse, IExtensionMessage, IMessageWithEvents, IMessage { public static bool operator !=(ClaimsResponse one, ClaimsResponse other); public static bool operator ==(ClaimsResponse one, ClaimsResponse other); [MessagePart("email")] public string Email { get; set; } [MessagePart("fullname")] public string FullName { get; set; } public override bool Equals(object obj); public override int GetHashCode(); } This is what I tried: ClaimsResponse MockCR = new ClaimsResponse(); MockCR.Email = "[email protected]"; MockCR.FullName = "Mister T"; I get the following error: '...ClaimsResponse(string)' is inaccessible due to its protection level. Kind regards, Pickels

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• How can I reliably check client identity whilst making DCOM calls to a C# .Net 3.5 Server?

  - by pionium

  Hi, I have an old Win32 C++ DCOM Server that I am rewriting to use C# .Net 3.5. The client applications sit on remote XP machines and are also written in C++. These clients must remain unchanged, hence I must implement the interfaces on new .Net objects. This has been done, and is working successfully regarding the implementation of the interfaces, and all of the calls are correctly being made from the old clients to the new .Net objects. However, I'm having problems obtaining the identity of the calling user from the DCOM Client. In order to try to identify the user who instigated the DCOM call, I have the following code on the server... [DllImport("ole32.dll")] static extern int CoImpersonateClient(); [DllImport("ole32.dll")] static extern int CoRevertToSelf(); private string CallingUser { get { string sCallingUser = null; if (CoImpersonateClient() == 0) { WindowsPrincipal wp = System.Threading.Thread.CurrentPrincipal as WindowsPrincipal; if (wp != null) { WindowsIdentity wi = wp.Identity as WindowsIdentity; if (wi != null && !string.IsNullOrEmpty(wi.Name)) sCallingUser = wi.Name; } if (CoRevertToSelf() != 0) ReportWin32Error("CoRevertToSelf"); } else ReportWin32Error("CoImpersonateClient"); return sCallingUser; } } private static void ReportWin32Error(string sFailingCall) { Win32Exception ex = new Win32Exception(); Logger.Write("Call to " + sFailingCall + " FAILED: " + ex.Message); } When I get the CallingUser property, the value returned the first few times is correct and the correct user name is identified, however, after 3 or 4 different users have successfully made calls (and it varies, so I can't be more specific), further users seem to be identified as users who had made earlier calls. What I have noticed is that the first few users have their DCOM calls handled on their own thread (ie all calls from a particular client are handled by a single unique thread), and then subsequent users are being handled by the same threads as the earlier users, and after the call to CoImpersonateClient(), the CurrentPrincipal matches that of the initial user of that thread. To Illustrate: User Tom makes DCOM calls which are handled by thread 1 (CurrentPrincipal correctly identifies Tom) User Dick makes DCOM calls which are handled by thread 2 (CurrentPrincipal correctly identifies Dick) User Harry makes DCOM calls which are handled by thread 3 (CurrentPrincipal correctly identifies Harry) User Bob makes DCOM calls which are handled by thread 3 (CurrentPrincipal incorrectly identifies him as Harry) As you can see in this illustration, calls from clients Harry and Bob are being handled on thread 3, and the server is identifying the calling client as Harry. Is there something that I am doing wrong? Are there any caveats or restrictions on using Impersonations in this way? Is there a better or different way that I can RELIABLY achieve what I am trying to do? All help would be greatly appreciated. Regards Andrew

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• Getting template metaprogramming compile-time constants at runtime

  - by GMan - Save the Unicorns

  Background Consider the following: template <unsigned N> struct Fibonacci { enum { value = Fibonacci<N-1>::value + Fibonacci<N-2>::value }; }; template <> struct Fibonacci<1> { enum { value = 1 }; }; template <> struct Fibonacci<0> { enum { value = 0 }; }; This is a common example and we can get the value of a Fibonacci number as a compile-time constant: int main(void) { std::cout << "Fibonacci(15) = "; std::cout << Fibonacci<15>::value; std::cout << std::endl; } But you obviously cannot get the value at runtime: int main(void) { std::srand(static_cast<unsigned>(std::time(0))); // ensure the table exists up to a certain size // (even though the rest of the code won't work) static const unsigned fibbMax = 20; Fibonacci<fibbMax>::value; // get index into sequence unsigned fibb = std::rand() % fibbMax; std::cout << "Fibonacci(" << fibb << ") = "; std::cout << Fibonacci<fibb>::value; std::cout << std::endl; } Because fibb is not a compile-time constant. Question So my question is: What is the best way to peek into this table at run-time? The most obvious solution (and "solution" should be taken lightly), is to have a large switch statement: unsigned fibonacci(unsigned index) { switch (index) { case 0: return Fibonacci<0>::value; case 1: return Fibonacci<1>::value; case 2: return Fibonacci<2>::value; . . . case 20: return Fibonacci<20>::value; default: return fibonacci(index - 1) + fibonacci(index - 2); } } int main(void) { std::srand(static_cast<unsigned>(std::time(0))); static const unsigned fibbMax = 20; // get index into sequence unsigned fibb = std::rand() % fibbMax; std::cout << "Fibonacci(" << fibb << ") = "; std::cout << fibonacci(fibb); std::cout << std::endl; } But now the size of the table is very hard coded and it wouldn't be easy to expand it to say, 40. The only one I came up with that has a similiar method of query is this: template <int TableSize = 40> class FibonacciTable { public: enum { max = TableSize }; static unsigned get(unsigned index) { if (index == TableSize) { return Fibonacci<TableSize>::value; } else { // too far, pass downwards return FibonacciTable<TableSize - 1>::get(index); } } }; template <> class FibonacciTable<0> { public: enum { max = 0 }; static unsigned get(unsigned) { // doesn't matter, no where else to go. // must be 0, or the original value was // not in table return 0; } }; int main(void) { std::srand(static_cast<unsigned>(std::time(0))); // get index into sequence unsigned fibb = std::rand() % FibonacciTable<>::max; std::cout << "Fibonacci(" << fibb << ") = "; std::cout << FibonacciTable<>::get(fibb); std::cout << std::endl; } Which seems to work great. The only two problems I see are: Potentially large call stack, since calculating Fibonacci<2 requires we go through TableMax all the way to 2, and: If the value is outside of the table, it returns zero as opposed to calculating it. So is there something I am missing? It seems there should be a better way to pick out these values at runtime. A template metaprogramming version of a switch statement perhaps, that generates a switch statement up to a certain number? Thanks in advance.

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• Pass or Get a value from Parent ViewModel down to Sub-ViewModel?

  - by mkmurray

  I am using the MVVM Light framework as well as Unity for DI. I have some nested Views, each bound to a corresponding ViewModel. The ViewModels are bound to each View's root control DataContext via the ViewModelLocator idea that Laurent Bugnion has put into MVVM Light. This allows for finding ViewModels via a static resource and for controlling the lifetime of ViewModels via a Dependency Injection framework, in this case Unity. It also allows for Expression Blend to see everything in regard to ViewModels and how to bind them. As I stated the Views have a healthy dose of nesting, but the ViewModels don't really know anything about each other. A parent view binds to its corresponding ViewModel via the static resource ViewModelLocator (which uses Unity to control the construction and lifetime of the ViewModel object). That parent view contains a user control in it that is another sub-view, which then goes and gets its corresponding ViewModel via the ViewModelLocator as well. The ViewModels don't have references to each other or know any hierarchy in regard to each other. So here's an example of how the ViewModels do interact via messaging. I've got a parent View that has a ComboBox databound to an ObservableCollection in its ViewModel. The ComboBox's SelectedItem is also bound (two-way) to a property on the ViewModel. When the selection of the ComboBox changes, this is to trigger updates in other Views and sub-Views. Currently I am accomplishing this via the Messaging system that is found in MVVM Light. So I'm wondering what the best practice would be to get information from one ViewModel to another? In this case, what I need to pass down to sub-ViewModels is basically a user Guid representing the currently logged in user. The top-most parent View (well, ViewModel) will know this information, but I'm not sure how to get it down into the sub-ViewModels. Some possible approaches I can think of: Should the sub-ViewModel ask the static resource ViewModelLocator for a reference to the same object the parent View is using and access the property that way? It seems like ViewModels going through each other's properties is not very clean and couples them together unnecessarily. I'm already using messaging to notify the sub-Views that the user selected a new item in the ComboBox and to update accordingly. But the object type that is being selected in the ComboBox is not really directly related to this data value that the sub-Views need.

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• C# yield in nested method

  - by Fastidious

  If I step through the following code the call to ReturnOne() is skipped. static IEnumerable<int> OneThroughFive() { ReturnOne(); yield return 2; yield return 3; yield return 4; yield return 5; } static IEnumerator<int> ReturnOne() { yield return 1; } I can only assume that the compiler is stripping it out because what I'm doing is not valid. I'd like the ability to isolate my enumeration into various methods. Is this possible?

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• Defining InputBindings within a Style

  - by Brent

  I'm creating a WPF app using the MVVM design pattern, and I'm trying to extend the TabItem control so that it closes the tab when the user clicks the middle mouse button. I'm trying to achieve this using InputBindings, and it works very well until I try to define it within a style. I've learned that you cannot add InputBindings to a style unless you attach it using a DependencyProperty. So I followed this similar post here... and it works... almost. I can close one tab using the middle mouse button, but it won't work on any of the other tabs (all of the tabs are added at runtime and inherit the same style). So I need some help. Why would this only be working the first time, and not after? Obviously I could create a custom control that inherits from a TabItem and make it work, but I'd like to figure this out as I can see this being expanded in my projects. I'm no expert on DependencyProperties, so please help me out. Thanks! Style: <Style TargetType="{x:Type TabItem}"> <Setter Property="w:Attach.InputBindings"> <Setter.Value> <InputBindingCollection> <MouseBinding MouseAction="MiddleClick" Command="{Binding CloseCommand}"/> </InputBindingCollection> </Setter.Value> </Setter> ... </Style> Class public class Attach { public static readonly DependencyProperty InputBindingsProperty = DependencyProperty.RegisterAttached("InputBindings", typeof(InputBindingCollection), typeof(Attach), new FrameworkPropertyMetadata(new InputBindingCollection(), (sender, e) => { var element = sender as UIElement; if (element == null) return; element.InputBindings.Clear(); element.InputBindings.AddRange((InputBindingCollection)e.NewValue); })); public static InputBindingCollection GetInputBindings(UIElement element) { return (InputBindingCollection)element.GetValue(InputBindingsProperty); } public static void SetInputBindings(UIElement element, InputBindingCollection inputBindings) { element.SetValue(InputBindingsProperty, inputBindings); } }

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• Configure IIS 7.0 to enable webservices in classic mode

  - by intermension

  What are the configuration file settings to enable webservices on IIS 7.0 in classic mode? The site has to be in a classic mode application pool because the Report Viewer controls crash when running in Integrated Mode. However in a classic mode application pool, webservices produce the following error message: The requested content appears to be script and will not be served by the static file handler. •If you want to serve this content as a static file, add an explicit MIME map EDIT - Additional Error Message Info: HTTP Error 404.17 - Not Found Module: StaticFileModule Notification: ExecuteRequestHandler Handler: StaticFile Error Code: 0x80070032 Note: This particular instance of the application will be running in a customers account on a shared hosting enviroment so access to IIS UI is not/will not be available. Specifically seeking configuration file adjustments.

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• .NET 1.0 ThreadPool Question

  - by dotnet-practitioner

  I am trying to spawn a thread to take care of DoWork task that should take less than 3 seconds. Inside DoWork its taking 15 seconds. I want to abort DoWork and transfer the control back to main thread. I have copied the code as follows and its not working. Instead of aborting DoWork, it still finishes DoWork and then transfers the control back to main thread. What am I doing wrong? class Class1 { /// <summary> /// The main entry point for the application. /// </summary> /// private static System.Threading.ManualResetEvent[] resetEvents; [STAThread] static void Main(string[] args) { resetEvents = new ManualResetEvent[1]; int i = 0; resetEvents[i] = new ManualResetEvent(false); ThreadPool.QueueUserWorkItem(new WaitCallback(DoWork),(object)i); Thread.CurrentThread.Name = "main thread"; Console.WriteLine("[{0}] waiting in the main method", Thread.CurrentThread.Name); DateTime start = DateTime.Now; DateTime end ; TimeSpan span = DateTime.Now.Subtract(start); //abort dowork method if it takes more than 3 seconds //and transfer control to the main thread. do { if (span.Seconds < 3) WaitHandle.WaitAll(resetEvents); else resetEvents[0].Set(); end = DateTime.Now; span = end.Subtract(start); }while (span.Seconds < 2); Console.WriteLine(span.Seconds); Console.WriteLine("[{0}] all done in the main method",Thread.CurrentThread.Name); Console.ReadLine(); } static void DoWork(object o) { int index = (int)o; Thread.CurrentThread.Name = "do work thread"; //simulate heavy duty work. Thread.Sleep(15000); //work is done.. resetEvents[index].Set(); Console.WriteLine("[{0}] do work finished",Thread.CurrentThread.Name); } }

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• SharePoint Q&A With the MVP Gang

  - by Bil Simser

  Interested in getting some first hand knowledge about SharePoint and all of it’s quirks, oddities, and secrets? We’re hosting not one, but *two* SharePoint Q&A sessions with the MVP crowd. Here’s the official blurb: Do you have tough technical questions regarding SharePoint for which you're seeking answers? Do you want to tap into the deep knowledge of the talented Microsoft Most Valuable Professionals? The SharePoint MVPs are the same people you see in the technical community as authors, speakers, user group leaders and answerers in the MSDN forums. By popular demand, we have brought these experts together as a collective group to answer your questions live. So please join us and bring on the questions! This chat will cover WSS, MOSS and the SharePoint 2010. Topics include setup and administration, design, development and general questions. Here’s a rundown of the expected guests for the chats: Agnes Molnar, Andrew Connell, Asif Rehmani, Becky Bertram, Me, Bryan Phillips, Chris O'Brien, Clayton Cobb, Dan Attis, Darrin Bishop, David Mann, Gary Lapointe, John Ross, Mike Oryzak, Muhanad Omar, Paul Stork, Randy Drisgill, Rob Bogue, Rob Foster, Shane Young, Spence Harbar. Apologies for not linking to everyone’s blogs, I’m just not that ambitious tonight. Please note that not everyone listed here is guaranteed to make it to either chat and there may be additions/changes at the last minute so the names may change to protect the innocent. The chat sessions will be held April 27th, 2010 at 4PM (PST) and April 28th at 9AM (PST). You can find out more details about the chats here or click here to add the April 27th event to your calendar, or click here to add the April 28th event (assuming your calendar software supports ICS files). See you there!

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• Picking a code review tool

  - by marcog

  We are a startup looking to migrate from Fogbugz/Kiln to a new issue tracker/code review system. We are very happy with Jira, especially the configurability, but we are undecided on a code review tool. We have been trialing Bitbucket, but it doesn't fit our workflow well. Here are the problems we have identified with BB: Comments can be hard to find: when commenting on code not visible in the diff when code that is commented on is later changed viewing the full file doesn't include comments (also doesn't show changes) Viewing comments on individual commits can be a pain We have the implementer merge the diff and close the issue, whereas pull requests are more suited to the open source model where someone with commit rights merges We would like to automate creation of the code review (either from Jira or a command line tool) No syntax highlighting Once the pull request exceeds a certain size, BB won't show the whole thing and you have to view individual commits Linking BB pull requests to Jira issues is a bit janky: we have a pull request URL field on Jira, but this doesn't work when there are changes in multiple repositories Does anyone have any good suggestion given the above? We are tight on budget, and Jira integration is a big plus. We also have multiple commits per issue, and would like to have the option of viewing individual commits in the review. It might also be worth noting that we have a separate reviewer and tester for each issue.

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• Maintaining both sides of self-referential many-to-many relationship in Grails domain object

  - by Ali G

  I'm having some problems getting a many-to-many relationship working in grails. Is there anything obviously wrong with the following: class Person { static hasMany = [friends: Person] static mappedBy = [friends: 'friends'] String name List friends = [] String toString() { return this.name } } class BootStrap { def init = { servletContext -> Person bob = new Person(name: 'bob').save() Person jaq = new Person(name: 'jaq').save() jaq.friends << bob println "Bob's friends: ${bob.friends}" println "Jaq's friends: ${jaq.friends}" } } I'd expect Bob to be friends with Jaq and vice-versa, but I get the following output at startup: Running Grails application.. Bob's friends: [] Jaq's friends: [Bob] (I'm using Grails 1.2.0)

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• Why default constructor does not appear for value types?

  - by Arun

  The below snippet gives me a list of constructors and methods of a type. static void ReflectOnType(Type type) { Console.WriteLine(type.FullName); Console.WriteLine("------------"); List<ConstructorInfo> constructors = type.GetConstructors(BindingFlags.Public | BindingFlags.Static | BindingFlags.NonPublic |BindingFlags.Instance | BindingFlags.Default).ToList(); List<MethodInfo> methods = type.GetMethods().ToList(); Type baseType = type.BaseType; while (baseType != null) { constructors.AddRange(baseType.GetConstructors(BindingFlags.Public | BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Default)); methods.AddRange(baseType.GetMethods()); baseType = baseType.BaseType; } Console.WriteLine("Reflection on {0} type", type.Name); for (int i = 0; i < constructors.Count; i++) { Console.Write("Constructor: {0}.{1}", constructors[i].DeclaringType.Name, constructors[i].Name); Console.Write("("); ParameterInfo[] parameterInfos = constructors[i].GetParameters(); if (parameterInfos.Length > 0) { for (int j = 0; j < parameterInfos.Length; j++) { if (j > 0) { Console.Write(", "); } Console.Write("{0} {1}", parameterInfos[j].ParameterType, parameterInfos[j].Name); } } Console.Write(")"); if (constructors[i].IsSpecialName) { Console.Write(" has 'SpecialName' attribute"); } Console.WriteLine(); } Console.WriteLine(); for (int i = 0; i < methods.Count; i++) { Console.Write("Method: {0}.{1}", methods[i].DeclaringType.Name, methods[i].Name); // Determine whether or not each field is a special name. if (methods[i].IsSpecialName) { Console.Write(" has 'SpecialName' attribute"); } Console.WriteLine(); } } But when I pass an ‘int’ type to this method, why don’t I see the implicit constructor in the output? Or, how do I modify the above code to list the default constructor as well (in case I’m missing something in my code).

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• Opposite method of math power adding numbers

  - by adopilot

  I have method for converting array of Booleans to integer. It looks like this class Program { public static int GivMeInt(bool[] outputs) { int data = 0; for (int i = 0; i < 8; i++) { data += ((outputs[i] == true) ? Convert.ToInt32(Math.Pow(2, i)) : 0); } return data; } static void Main(string[] args) { bool[] outputs = new bool[8]; outputs[0] = false; outputs[1] = true; outputs[2] = false; outputs[3] = true; outputs[4] = false; outputs[5] = false; outputs[6] = false; outputs[7] = false; int data = GivMeInt(outputs); Console.WriteLine(data); Console.ReadKey(); } } Now I want to make opposite method returning array of Booleans values As I am short with knowledge of .NET and C# until now I have only my mind hardcoding of switch statement or if conditions for every possible int value. public static bool[] GiveMeBool(int data) { bool[] outputs = new bool[8]; if (data == 0) { outputs[0] = false; outputs[1] = false; outputs[2] = false; outputs[3] = false; outputs[4] = false; outputs[5] = false; outputs[6] = false; outputs[7] = false; } //After thousand lines of coed if (data == 255) { outputs[0] = true; outputs[1] = true; outputs[2] = true; outputs[3] = true; outputs[4] = true; outputs[5] = true; outputs[6] = true; outputs[7] = true; } return outputs; } I know that there must be easier way.

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• Getting problem in accessing web cam.

  - by Chetan

  Hi... I have written code in Java to access web cam,and to save image... I am getting following exceptions : Exception in thread "main" java.lang.NullPointerException at SwingCapture.(SwingCapture.java:40) at SwingCapture.main(SwingCapture.java:66) how to remove this exceptions. here is the code: import javax.swing.*; import javax.swing.event.; import java.io.; import javax.media.; import javax.media.format.; import javax.media.util.; import javax.media.control.; import javax.media.protocol.; import java.util.; import java.awt.; import java.awt.image.; import java.awt.event.; import com.sun.image.codec.jpeg.; public class SwingCapture extends Panel implements ActionListener { public static Player player = null; public CaptureDeviceInfo di = null; public MediaLocator ml = null; public JButton capture = null; public Buffer buf = null; public Image img = null; public VideoFormat vf = null; public BufferToImage btoi = null; public ImagePanel imgpanel = null; public SwingCapture() { setLayout(new BorderLayout()); setSize(320,550); imgpanel = new ImagePanel(); capture = new JButton("Capture"); capture.addActionListener(this); String str1 = "vfw:iNTEX IT-308 WC:0"; String str2 = "vfw:Microsoft WDM Image Capture (Win32):0"; di = CaptureDeviceManager.getDevice(str2); ml = di.getLocator(); try { player = Manager.createRealizedPlayer(ml); player.start(); Component comp; if ((comp = player.getVisualComponent()) != null) { add(comp,BorderLayout.NORTH); } add(capture,BorderLayout.CENTER); add(imgpanel,BorderLayout.SOUTH); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { Frame f = new Frame("SwingCapture"); SwingCapture cf = new SwingCapture(); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { playerclose(); System.exit(0);}}); f.add("Center",cf); f.pack(); f.setSize(new Dimension(320,550)); f.setVisible(true); } public static void playerclose() { player.close(); player.deallocate(); } public void actionPerformed(ActionEvent e) { JComponent c = (JComponent) e.getSource(); if (c == capture) { // Grab a frame FrameGrabbingControl fgc = (FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl"); buf = fgc.grabFrame(); // Convert it to an image btoi = new BufferToImage((VideoFormat)buf.getFormat()); img = btoi.createImage(buf); // show the image imgpanel.setImage(img); // save image saveJPG(img,"\test.jpg"); } } class ImagePanel extends Panel { public Image myimg = null; public ImagePanel() { setLayout(null); setSize(320,240); } public void setImage(Image img) { this.myimg = img; repaint(); } public void paint(Graphics g) { if (myimg != null) { g.drawImage(myimg, 0, 0, this); } } } public static void saveJPG(Image img, String s) { BufferedImage bi = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics2D g2 = bi.createGraphics(); g2.drawImage(img, null, null); FileOutputStream out = null; try { out = new FileOutputStream(s); } catch (java.io.FileNotFoundException io) { System.out.println("File Not Found"); } JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi); param.setQuality(0.5f,false); encoder.setJPEGEncodeParam(param); try { encoder.encode(bi); out.close(); } catch (java.io.IOException io) { System.out.println("IOException"); } } }

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