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• MVVM/ViewModels and handling Authorization

  - by vdh_ant

  Hey guys Just wondering how how people handle Authorization when using MVVM and/or View Models. If I wasn't using VM's I would be passing back the Model and it would have a property which I could check if a user can edit a given object/property but when using MVVM I am disconnecting myself from the business object... and thus doen't know what the security should be any more. Is this a case where the mapper should be aware of the Authorization that is in place and don't copy across the data if the Authorization check fails. If this was the case I am guessing that the mapper would have to see some properties on the VM to let the interface know which fields are missing data because of the Authorization failure. If this does occur within the mapper, how does this fit in with things like AutoMapper, etc. Cheers Anthony

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• DRM for videos bundled with a desktop app?

  - by onekidney

  Hey everybody, So, I have this desktop app built using WPF and C#. It's basically an offline course system that has videos, quizzes, and other assorted content. My dilemma is that I don't know how to protect the videos once they are downloaded and installed on the users machine? Are there any DRM systems out there that I can look into? I thought about storing them in a local encrypted database but I don't even know where to start with that (or if there is something else out there that I'm totally missing...) Don't even know where to start looking on this one - any ideas?

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• Java and junit: derivative of polynomial method testing issue

  - by Curtis

  Hello all, im trying to finish up my junit testing for finding the derivative of a polynomial method and im having some trouble making it work. here is the method: public Polynomial derivative() { MyDouble a = new MyDouble(0); MyDouble b = this.a.add(this.a); MyDouble c = this.b; Polynomial poly = new Polynomial (a, b, c); return poly; } and here is the junit test: public void testDerivative() { MyDouble a = new MyDouble(2), b = new MyDouble(4), c = new MyDouble(8); MyDouble d = new MyDouble(0), e = new MyDouble(4), f = new MyDouble(4); Polynomial p1 = new Polynomial(a, b, c); Polynomial p2 = new Polynomial(d,e,f); assertTrue(p1.derivative().equals(p2)); } im not too sure why it isnt working...ive gone over it again and again and i know im missing something. thank you all for any help given, appreciate it

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• Invoking EventHandler generic, TargetParameterCountException

  - by Am

  Hi, I have a DirectoryMonitor class which works on another thread. It has the following events declared: public class DirectoryMonitor { public event EventHandler<MonitorEventArgs> CreatedNewBook; public event EventHandler ScanStarted; .... } public class MonitorEventArgs : EventArgs { public Book Book { get; set; } } There is a form using that monitor, and upon receiving the events, it should update the display. Now, this works: void DirectoryMonitor_ScanStarted(object sender, EventArgs e) { if (InvokeRequired) { Invoke(new EventHandler(this.DirectoryMonitor_ScanStarted)); } else {...} } But this throws TargetParameterCountException: void DirectoryMonitor_CreatedNewBook(object sender, MonitorEventArgs e) { if (InvokeRequired) { Invoke(new EventHandler<MonitorEventArgs>(this.DirectoryMonitor_CreatedNewBook)); } else {...} } What am I missing?

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• De-dupe a list of hundreds of thousands of first name/last name/address/date of birth

  - by Darren

  I have a large data set which I know contains many dupicate records. Basically I have data on first name, last name, different address components and date of birth. I think the best way to do this is to use the name and date of birth as chances are if these things match, it's the same person. There are probably lots of instances where there are slight differences in spelling (like typos missing a single letter) or use of name (ie: some might have a middle initial in first name column) which would be good to account for, but I'm not sure how to approach this. Are there any tools or articles on going about this process? The data is all in a MySQL database and I have a basic proficiency in SQL.

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• Create new UIImage by adding shadow to existing UIImage

  - by Tom Irving

  I've taken a look at this question: http://stackoverflow.com/questions/962827/uiimage-shadow But the accepted answer didn't work for me. What I'm trying to do is take a UIImage and add a shadow to it, then return a whole new UIImage, shadow and all. This is what I'm trying: - (UIImage*)imageWithShadow { CGColorSpaceRef colourSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef shadowContext = CGBitmapContextCreate(NULL, self.size.width, self.size.height + 1, CGImageGetBitsPerComponent(self.CGImage), 0, colourSpace, kCGImageAlphaPremultipliedLast); CGColorSpaceRelease(colourSpace); CGContextSetShadow(shadowContext, CGSizeMake(0, -1), 1); CGContextDrawImage(shadowContext, CGRectMake(0, 0, self.size.width, self.size.height), self.CGImage); CGImageRef shadowedCGImage = CGBitmapContextCreateImage(shadowContext); CGContextRelease(shadowContext); UIImage * shadowedImage = [UIImage imageWithCGImage:shadowedCGImage]; CGImageRelease(shadowedCGImage); return shadowedImage; } The result is that I get exactly the same image as before I put it through this method. I am doing this the correct way, or is there something obvious I'm missing?

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• Binding redirect problem in .net

  - by Suresh

  I have a class library called "MyAssembly" that is internally referencing a.dll, b.dll of version 3.1.1.0; I have build the project which outputed MyAssembly.dll. On a different system (box) I have created a web application project and referenced the MyAssembly.dll. the new system has new versions of a.dll and b.dll 4.0.0; I used binding redirect in web.config like below. But still unable to compile the web application. it says missing assembly reference a.dll, version 3.1.1.0. Could any body help in solving this issue? Thanks, Suresh

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• Making the domain-model of tic tac toe

  - by devoured elysium

  I am trying to make the domain model of a Tic Tac Toe game. I'll try then to go on through the various steps of the Unified Process and later implement it in some language (C# or Java). I'd like to have some feedback if I'm going on the right path: I've defined the game with two actors, Player O and Player X. I'm not sure about defining both a Tile and a Tile State. Maybe I should only define a Tile and have the 3 possible states specialize from it? I'm not sure what is best: to have both Player O and Player X be associations with Tic Tac Toe or have them inherit from Player that is associated with Tic Tac Toe. Following the design shown on the pic, in theory we could have a Tic Tac Toe concept with 2 Player O's, which wouldn't be correct. What is your opinion on this? Also, am I missing something in the diagram? Although I can't see any other actors for Tic Tac Toe, should I have any other? Thanks

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• running VisualStudio CF3.5 apps on WINCE

  - by marc

  Hi, I am trying to write a program for a chinese PNA device with wince 5.0. But everytime I write a simple program in VS8 with C# and 'deploy' it to my device it just doesn't run. First it complains about disposing an object call menu, although I don't want an menu but VS8 just creates one for me. If I delete the menu from the form the program gives an exception. I installed a program call MIOPocket on the PNA with has powertoys some games and MS media player. It also creates a directory .net framework 3.5 so I known 3.5 is installed and must be working. But I think I am missing something. I am also not sure what to choice as target device ; windows mobile or WINCE. If I click the .exe file under win7 it works but under wince its a no go. Maybe someone has a clue what is going wrong ?

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• Globalization for GetSystemTimeZones()

  - by user300992

  I want to get a list of timezones, so that i can populate the dropdown list. In .NET 3.5, we have TimeZoneInfo namespace, here is the code: ReadOnlyCollection<TimeZoneInfo> timeZones = TimeZoneInfo.GetSystemTimeZones(); foreach (TimeZoneInfo timeZone in timeZones) string name = timeZone.DisplayName However, "DisplayName" is in English. How can I pass the cultureInfo so that it can return other languages? I tried setting the Thread.CurrentCulture and CurrentUICulture, it didn't work. Am I missing something?

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• Why don't Direct2D and DirectWrite use traditional COM objects?

  - by David Brown

  I'm toying with a little 2D game engine in C# and decided to use Direct2D and DirectWrite for rendering. I know there's the Windows API Code Pack and SlimDX, but I'd really like to dig in and write an interface from scratch. I'm trying to do it without Managed C++, but Direct2D and DirectWrite don't appear to use traditional COM objects. They define interfaces that derive from IUnknown, but there appears to be no way to actually use them from C# with COM interop. There are IIDs in d2d1.h, but no CLSID. Of course, I'm really new to COM interop, so perhaps I'm just missing something. Can someone shed some light on this situation?

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• Does IsolatedStorageFileStream.Lock work under SIlverlight4?

  - by Noah

  Silverlight uses an IsolatedStorageFileStream to open files. The IsolatedStorageFileStreamunder NET.4 claims to support the Lock Method (Inherited from FileStream) The following code IsolatedStorageFile isf; IsolatedStorageFileStream lockStream = new IsolatedStorageFileStream( "my.lck", FileMode.OpenOrCreate, isf ); lockStream.Lock( 0, 0 ); generates the following error, wrapped for readability, under VS2010 and Silverlight 4 'System.IO.IsolatedStorage.IsolatedStorageFileStream' does not contain a definition for 'Lock' and no extension method 'Lock' accepting a first argument of type 'System.IO.IsolatedStorage.IsolatedStorageFileStream' could be found (are you missing a using directive or an assembly reference?)

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• Developing Installer Packages, are Visual Studio Setup Projects suitable for complex setups

  - by Robert

  Are "Visual Studio Setup" Projects suitable for complex setups in different versions? The application is rather large ( 500.000 lines of code) and is under continuous development. Every 6 to 10 month a new version gets released. We have multiple configuration files (INI and XML), registry keys, database migration scripts, etc. The application is in the progress of being migrated from VB6 to .NET . The old installer was build with Installshield. The feedback to Installshield is: Bad adaptability, bad reuse - thats way we are evaluating "Visual Studio Setup" as an alternative. Other products we consider: Free Solutions WiX NSIS Commercial Solutions Installshield (again..) Wise Advanced Installer sth. missing? Solutions we don't like to consider: Inno Setup (It just doesn't feel right)

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• Using Nearest Neighbour Algorithm for image pattern recognition

  - by user293895

  So I want to be able to recognise patterns in images (such as a number 4), I have been reading about different algorithms and I would really like to use the Nearest Neighbour algorithm, it looks simple and I do understand it based on this tutorial: http://people.revoledu.com/kardi/tutorial/KNN/KNN_Numerical-example.html Problem is, although I understand how to use it to fill in missing data sets, I don't understand how I could use it as a pattern recognition tool to aim in Image Shape Recognition. Could someone please shed some light as to how this algorithm could work for pattern recognition? I have seen tutorials using OpenCV, however I don't really want to use this library as I have the ability to do the pre-processing myself, and it seems silly that I would implement this library just for what should be a simple nearest neighbour algorithm.

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• How to render plain HTML links in Asp.Net MVC loop?

  - by Joannes Vermorel

  I would like to render a list of HTML links in ASP.NET MVC. Note that the links are absolute and external to the website being designed. The following code works: <% foreach (var item in Model) { %> <tr> <td> <%= Html.Encode(item.Id) %> </td> <td> <%= String.Format("<a href=\"{0}\">link</a>", item.Url) %> </td> </tr> <% } %> But I am wondering if it's really the right approach. Am I missing some obvious MVC control here?

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• The type or namespace name 'Mvc' does not exist in the namespace 'System.Web'

  - by Guy

  After converting a Hybrid ASP.NET MVC1 app to MVC2 I'm getting the following error when I try and run the application: The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' (are you missing an assembly reference?) The allegeded culprit in the web.config file is System.Web.Mvc: <namespaces> <add namespace="System.Web.Mvc"/> <add namespace="System.Web.Mvc.Ajax"/> <add namespace="System.Web.Mvc.Html"/> So far my investigation seems to lead me to believe that version 2 of System.Web.Mvc is not installed or has not been picked up. I've tried creating a File New Project based on MVC 2 and that's picking up the new (v2) version of MVC. I've also converted some other projects (that were not hybrids) and they've converted without problem to MVC2. I've also uninstalled MVC1 to try and remove references to it from the GAC. However, none of this has worked. Any ideas?

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• Export JPG out of Dicom File With mDCM

  - by Ross Peoples

  Hello, I'm using mDCM with C# to view dicom tags, but I'm trying to convert the pixel data to a Bitmap and eventually out to a JPG file. I have read all of the posts on the mDCM Google Group on the subject and all of the code examples either don't work or are missing important lines of code. The image I am working with is a 16 bit monochrome1. I have tried using LockBits, SetPixel, and unsafe code in order to convert the pixel data to a Bitmap but all attempts fail. Does anyone have any code that could make this work. Thanks in advance P.S. Before anyone suggests trying something else like ClearCanvas, know that mDCM is the only library that suits my needs and ClearCanvas is WAY too bloated for what I need to do.

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• UINavigationController inside UINavigationController view issue

  - by HurkNburkS

  I have two navigationcontrollers a main one and a sub one. The sub one is displaying inside the main one, which I am also hiding its navigationbar. as a result I am having some weird issues (things inside the view are being pushed down exactly the height of the navigationbar i am hiding) with the stuff I am displaying on the inside of the sub navigationcontroller. it looks like this. The left view is what I am doing in interface builder and the resulting view in the simulator. any help would be greatly appreciated. UPDATE: Here is the view with the subnav bar turned on so you can see the structure of my view. and here is the same view with the subnav turned off... can you see how the A is still sitting lower than it should be.. wel I think its because of the main navbar now as the whole subnavbar sits inside this view.. Last update that shows whats missing from the view

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• How to digitally sign a message with M2Crypto using the keys within a DER format certificate

  - by Pablo Santos

  Hi everyone. I am working on a project to implement digital signatures of outgoing messages and decided to use M2Crypto for that. I have a certificate (in DER format) from which I extract the keys to sign the message. For some reason I keep getting an ugly segmentation fault error when I call the "sign_update" method. Given the previous examples I have read here, I am clearly missing something. Here is the example I am working on: from M2Crypto.X509 import * cert = load_cert( 'certificate.cer', format=0 ) Pub_key = cert.get_pubkey() Pub_key.reset_context(md='sha1') Pub_key.sign_init() Pub_key.sign_update( "This should be good." ) print Pub_key.sign_final() Thanks in advance for the help, Pablo

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• Authenticating with Netflix: Netflix OAuth vs. SignPost OAuth: Which is correct?

  - by Stefan Kendall

  With signpost 1.2: String authUrl = provider.retrieveRequestToken( consumer, callbackUrl ); Netflix API response: <status> <status_code> 400 </status_code> <message> oauth_consumer_key is missing </message> </status> I see how to craft the URL manually via the netflix documentation, but this seems to contradict other services which use OAuth authentication. Who's incorrect, here? Is there a way to get signpost to work with Netflix, aside from contributing to the signpost source? :P

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• How to use SharpSVN to (quickly) check if a remote folder/file exists on the server

  - by Ziphnor

  Say i have a svn repository at https://www.mysvn.com/svn/. How can i use SharpSVN to figure out whether the remote folder https://www.mysvn.com/svn/a/b/c exists on the server? I need to do it an a way that allows me to tell the difference between a failed connection (ie server down) and the folder simply not having been created yet. Calling info on the full https://www.mysvn.com/svn/a/b/c path does not seem to give an exception that enables me to tell the difference between no repository at all and just a missing folder. I could list all files for https://www.mysvn.com/svn/ but the repository can easily be so big that this can take too long. Right now im doing an info on first the root url and then on the full url. If the root url fails i treat it as a server problem, but if it succeeds and the full url fails i assume its because part of the path hasnt been created on the server.

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• Excel and Tab Delimited Files Question

  - by OneNerd

  I am encountering what I believe to be a strange issue with Excel (in this case, Excel 2007, but maybe also Excel 2003, but don't have access to it as I write this). I can reliably convert some server data over into a tab-delimited format (been doing this for years) and then open it using Excel - no issue. However, what seems to be happening is if I have an html <table inside one of the fields, it looks like Excel 2007 thinks it should be converting the table into rows and columns inside Excel (not what I want). As you might imagine, this throws off the entire spreadsheet. So question is, is there any way to set up excel to NOT do this (perhaps some setting in Excel that pertains to reading tab delimited files), or am I missing something? Thanks.

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• How to create a protocol at runtime in Objective-C?

  - by Jared P

  Hi, First of all, I want to be clear that I'm not talking about defining a protocol, and that I understand the concept of @protocol someprotocol - (void)method; @end I know that the Obj-C runtime allows creation of classes at RUNTIME, as well as its ivars and methods. Also available for creation are SEL-s. I think I'm just missing something, but does anyone know what function to call to create a protocol at runtime? The main reason for this is for conformsToProtocol: to work, so just adding the appropriate methods doesn't really cut it.

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• Does it make sense to use a NSFetchedResultsController without an UITableViewController? How are the

  - by dontWatchMyProfile

  I mean... could I also just create a plain old UIViewController and then set up a UITableView myself, plus an NSFetchedResultsController? How much do UITableViewController and NSFetchedResultsController interact with eachother? As far as I see it, UITableViewController is NOT by default already adopting the NSFetchedResultsControllerDelegate protocol. It almost looks like if UITableViewController has been developed without knowing about NSFetchedResultsController. Probably they even did that before developing FRC. Anyways, just a raw guess because the UITableViewController lacks of mentioning FRC at all. So the only thing I see in UITableViewController is that it is already the delegate for a UITableView by adopting the protocol, and it sets up the UITableView instance for me and assigns it internally to it's tableView property. Is that the whole magic of UITableViewController? (note: the nsfetchedresultscontrolle tag is not a typo. SO has a limit for the num of chars...too bad for that missing r, that's why I avoided this tag in my other buch of questions like the plague)

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• IntelliJ 9, Glassfish 2.1.1 & Maven2

  - by Xetius

  I have a Maven2 project which I am editing in IntelliJ IDEA 9.0.2. I am trying to build it and debug it within a Glassfish 2.1.1 container. This is only working sometimes. Occasionally it is giving me an error, telling me it can't deploy. Other times, it deploys, but does not run the filtering on the POM, not replacing a variable in the sun-web.xml file (and other container specific files) leaving it as ${targetenv} instead of replacing it with the value it should. I think I am missing something here, and have something very confused, but I have no idea what. Any help would be most gratefully received.

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