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• Language Agnostic Basic Programming Question

  - by Rachel

  This is very basic question from programming point of view but as I am in learning phase, I thought I would better ask this question rather than having a misunderstanding or narrow knowledge about the topic. So do excuse me if somehow I mess it up. Question: Let's say I have class A,B,C and D now class A has some piece of code which I need to have in class B,C and D so I am extending class A in class B, class C, and class D Now how can I access the function of class A in other classes, do I need to create an object of class A and than access the function of class A or as am extending A in other classes than I can internally call the function using this parameter. If possible I would really appreciate if someone can explain this concept with code sample explaining how the logic flows. Note Example in Java, PHP and .Net would be appreciated.

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• Android - Barcode Scanning, Options? Zxing?

  - by Donal Rafferty

  I want to create an application for Android that will be able to scan barcodes, get the information contained within the barcode and then be able to use that information in some way. I have no idea how to create a barcode scanner so I went Googling and it seems Zxing is the most commonly used way to implement a barcode scanner in an app. Some Links: http://code.google.com/p/zxing/ http://awalkingcity.com/blog/2008/08/25/qr-codes-made-easy-in-android/ http://stackoverflow.com/questions/2050263/using-zxing-to-create-an-android-barcode-scanning-app However the samples I found on zxing involved having to prompt the user to go to the market and install the zxing barcode scanner so that my app can then call the barcode scanner when its needed and the barcode scanner will then return the info to my app. While this would be a good starting point for me I was wondering is there any other options that would allow me to have a barcode scanner embedded in my own application without having to prompt the user to download a secondary application?

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• Creating .NET 3.0 sub-applications within .NET 1.1 applications in IIS/ASP.Net

  - by Karen

  I am basically trying to do the same thing as this question, create a new application within a folder so it could be accessed as follows. * http://www.domain.com/ < Main App * http://www.domain.com/newapp < New App The problem is that newapp is reading the web.config from the Main App, which is causing errors because it doesn't have all the same dlls etc. For New App, in IIS, the starting point is set at /newapp, so I am not sure why it is reading the web.config from / at all. It is set as it's own application. I am testing this in IIS6 on XP Pro, so not sure if that makes a difference. The Main App is dotnet 1.1, and New App is 3.0. Edit: Adding 'inheritInChildApplications to <location doesn't work in 1.1, you get an error: Parser Error Message: Unrecognized attribute 'inheritInChildApplications'

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• CNAME Record in .htaccess file: correct format?

  - by Josh

  In my .htaccess file, I have set up several A records in the following structure: RewriteCond %{HTTP_HOST} ^domain.com$ [OR] RewriteCond %{HTTP_HOST} ^www.domain.com$ RewriteRule ^substring\/substring\/etc?$ "http\:\/\/domain\.com\/newsubstring\/etc\/" [R=301,L] Is is possible to easily set up a CNAME record in the same fashion and put it in my .htaccess file? Unfortunately, my dumb DNS (namecheap) doesn't let me change CNAME records because my site actually has hosting and isn't just a parked domain. (I actually just want to set up a CNAME for www, since at the moment www.domain.com doesn't work for me, and only domain.com -- I'm going to point the former to the latter.)

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• SoapHttpClientProtocol disable ssl certificate validation

  - by MK

  I need to tell my C# soap web service consumer to not validate the certificate and just accept it. Is this possible? Why: we publish a https-only web service. A client needs to consume it but has some kind of firewall/proxy (WebSense?) which does something to the certificate to make it fail validation. At this point I don't even know the details of what it does, but the customer appears to be ok with forfeiting the benefits of SSL, so I'm looking for a workaround.

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• How to update an XBAP’s config file after deployment

  - by maharaj

  Hi All, Here is my scenario and would love any feedback. We have a WPF XBAP application which gets hosted on our customer's IIS server on which we as a vendor do not have any control over. So as a part of configuration, clients first need to configure the WCF service to point to the proper endpoints. Default location for the service is say "http://localhost/XYZ.svc" which needs to change to proper adderess such as "http://USC.intl.edu/XYZ.svc" (offcourse our service is not called XYZ, just using that name as an example). Problem in our test scenario is as soon as we change these values in the config file (Appname.exe.config) the manifest file becomes invalid and we start getting errors. The solutions that I have looked at talk about mageui.exe. Our clinets may not have this utility. So how can we achieve this without using this utility and have the app be configurable. Any input will be appreciated. Thanks, Salil

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• jquery nested sortable

  - by mcgrailm

  I have been using NestedSortabe from b-hind and found it quite useful until I upgraded to latest jquery and jquery-ui I guess they changed the way mouse events are handled or something to that effect. Point it the nestedSortable doesn't work any longer. So my question is tri fold does anyone know if the folks at jquery have implemented a nested sortable I haven't seen anything. or does anyone know how to fix the b-hind version or know of something better / light weight to accomplish the same goals would like something compatible with lastest jquery-ui EDIT: it appears as though the lastest version of jquery-ui-sortable supports nested sorting !!!

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• Fail to launch application (CreateProcess error=87), can't use shorten classpath workaround

  - by Ivo Bosticky

  When I launch our application in Eclipse on Windows I receive the following error: Exception occured executing command line. Cannot run program .. : CreateProcess error=87, The parameter is incorrect I've solved this in the past by shortening the CLASSPATH. I've now come to a point where I can no longer shorten the CLASSPATH, and would like to know if there are any other workarounds. http://support.microsoft.com/kb/830473 seems to indicate that the max command prompt line length in windows xp is 8191 characters, and the only solution is to shorten folder names, reduce depth of folder trees, using parameter files, etc.

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• For buffer overflows, what is the stack address when using pthreads?

  - by t2k32316

  I'm taking a class in computer security and there is an extra credit assignment to insert executable code into a buffer overflow. I have the c source code for the target program I'm trying to manipulate, and I've gotten to the point where I can successfully overwrite the eip for the current function stack frame. However, I always get a Segmentation fault, because the address I supply is always wrong. The problem is that the current function is inside a pthread, and therefore, the address of the stack seems to always change between different runs of the program. Is there any method for finding the stack address within a pthread (or for estimating the stack address within a pthread)? (note: pthread_create's 2nd argument is null, so we're not manually assigning a stack address)

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• How to print WPF Grid paged?

  - by Oliver Hanappi

  Hi! I'm printing a WPF grid. As long as the data fits on one page, everything works fine. But sometimes the grid contains more data. Therefore I need to split the grid into multiple pages. Can anybody help me? My code looks like this (visual is the grid). var printCapabilities = printDialog.PrintQueue.GetPrintCapabilities(printDialog.PrintTicket); var size = new Size(printCapabilities.PageImageableArea.ExtentWidth, printCapabilities.PageImageableArea.ExtentHeight); visual.Measure(size); visual.Arrange(new Rect(new Point(printCapabilities.PageImageableArea.OriginWidth, printCapabilities.PageImageableArea.OriginHeight), size)); printDialog.PrintVisual(visual, "Print ListView"); Should I try another control? I've tried WPF Toolkit DataGrid, but I couldn't manage to get it printed. I've heard something of a flow document, can this help me? Best Regards Oliver Hanappi

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• Creating sub-applications within applications in IIS/ASP.Net

  - by Karen

  I am basically trying to do the same thing as this question, create a new application within a folder so it could be accessed as follows. * http://www.domain.com/ < Main App * http://www.domain.com/newapp < New App The problem is that newapp is reading the web.config from the Main App, which is causing errors because it doesn't have all the same dlls etc. For New App, in IIS, the starting point is set at /newapp, so I am not sure why it is reading the web.config from / at all. It is set as it's own application. I am testing this in IIS6 on XP Pro, so not sure if that makes a difference. The Main App is dotnet 1.1, and New App is 3.0.

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• Using Image Source with big images in WPF

  - by xyzzer

  I am working on an application that allows users to manipulate multiple images by using ItemsControl. I started running some tests and found that the app has problems displaying some big images - ie. it did not work with the high resolution (21600x10800), 20MB images from http://earthobservatory.nasa.gov/Features/BlueMarble/BlueMarble_monthlies.php, though it displays the 6200x6200, 60MB Hubble telescope image from http://zebu.uoregon.edu/hudf/hudf.jpg just fine. The original solution just specified an Image control with a Source property pointing at a file on a disk (through a binding). With the Blue Marble file - the image would just not show up. Now this could be just a bug hidden somewhere deep in the funky MVVM + XAML implementation - the visual tree displayed by Snoop goes like: Window/Border/AdornerDecorator/ContentPresenter/Grid/Canvas/UserControl/Border/ContentPresenter/Grid/Grid/Grid/Grid/Border/Grid/ContentPresenter/UserControl/UserControl/Border/ContentPresenter/Grid/Grid/Grid/Grid/Viewbox/ContainerVisual/UserControl/Border/ContentPresenter/Grid/Grid/ItemsControl/Border/ItemsPresenter/Canvas/ContentPresenter/Grid/Grid/ContentPresenter/Image... Now debug this! WPF can be crazy like that... Anyway, it turned out that if I create a simple WPF application - the images load just fine. I tried finding out the root cause, but I don't want to spend weeks on it. I figured the right thing to do might be to use a converter to scale the images down - this is what I have done: ImagePath = @"F:\Astronomical\world.200402.3x21600x10800.jpg"; TargetWidth = 2800; TargetHeight = 1866; and <Image> <Image.Source> <MultiBinding Converter="{StaticResource imageResizingConverter}"> <MultiBinding.Bindings> <Binding Path="ImagePath"/> <Binding RelativeSource="{RelativeSource Self}" /> <Binding Path="TargetWidth"/> <Binding Path="TargetHeight"/> </MultiBinding.Bindings> </MultiBinding> </Image.Source> </Image> and public class ImageResizingConverter : MarkupExtension, IMultiValueConverter { public Image TargetImage { get; set; } public string SourcePath { get; set; } public int DecodeWidth { get; set; } public int DecodeHeight { get; set; } public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { this.SourcePath = values[0].ToString(); this.TargetImage = (Image)values[1]; this.DecodeWidth = (int)values[2]; this.DecodeHeight = (int)values[3]; return DecodeImage(); } private BitmapImage DecodeImage() { BitmapImage bi = new BitmapImage(); bi.BeginInit(); bi.DecodePixelWidth = (int)DecodeWidth; bi.DecodePixelHeight = (int)DecodeHeight; bi.UriSource = new Uri(SourcePath); bi.EndInit(); return bi; } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new Exception("The method or operation is not implemented."); } public override object ProvideValue(IServiceProvider serviceProvider) { return this; } } Now this works fine, except for one "little" problem. When you just specify a file path in Image.Source - the application actually uses less memory and works faster than if you use BitmapImage.DecodePixelWidth. Plus with Image.Source if you have multiple Image controls that point to the same image - they only use as much memory as if only one image was loaded. With the BitmapImage.DecodePixelWidth solution - each additional Image control uses more memory and each of them uses more than when just specifying Image.Source. Perhaps WPF somehow caches these images in compressed form while if you specify the decoded dimensions - it feels like you get an uncompressed image in memory, plus it takes 6 times the time (perhaps without it the scaling is done on the GPU?), plus it feels like the original high resolution image also gets loaded and takes up space. If I just scale the image down, save it to a temporary file and then use Image.Source to point at the file - it will probably work, but it will be pretty slow and it will require handling cleanup of the temporary file. If I could detect an image that does not get loaded properly - maybe I could only scale it down if I need to, but Image.ImageFailed never gets triggered. Maybe it has something to do with the video memory and this app just using more of it with the deep visual tree, opacity masks etc. Actual question: How can I load big images as quickly as Image.Source option does it, without using more memory for additional copies and additional memory for the scaled down image if I only need them at a certain resolution lower than original? Also, I don't want to keep them in memory if no Image control is using them anymore.

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• New to iPhone SDK: touchesBegan not called

  - by coriolan

  Hi, I created a very very basic iPhone app with File/New Projet/View-Based application. No NIB file there. Here is my appDelegate .h @interface MyAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; MyViewController *viewController; } .m - (void)applicationDidFinishLaunching:(UIApplication *)application { // Override point for customization after app launch [window addSubview:viewController.view]; [window makeKeyAndVisible]; } And here is my loadView method in my controller - (void)loadView { CGRect mainFrame = [[UIScreen mainScreen] applicationFrame]; UIView *contentView = [[UIView alloc] initWithFrame:mainFrame]; contentView.backgroundColor = [UIColor redColor]; self.view = contentView; [contentView release]; } Now, in order to catch the touchesBegan event, I created a new subclass of UIView: .h @interface TouchView : UIView { } .m - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"Touch detected"); } and modified the second line in my loadView into this : TouchView *contentView = [[UIView alloc] initWithFrame:mainFrame]; Why is touchesBegan never called?

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• SharePoint 2010 FBA with custom form - 403 error

  - by Chris R Chapman

  I have a SharePoint 2010 site that is configured for Forms Based Auth using custom role, membership and profile providers. This works perfectly using the OOTB SharePoint 2010 FBA form (ie. under /_forms in the web app virtual directory). My problem is with a custom login form that is located in a separate folder, /Landing/Login/default.aspx. I've configured the web app to point to this form (contains an unmodified ASP.NET login control), which is rendered when the user hits the root URL. The problem comes when they submit their credentials and the form posts back for the redirection to /_layouts/Authenticate.aspx. It stops cold with a 403. If I revert back to the OOTB FBA form (using the same providers) everything works fine. Any suggestions on what could be going wrong?

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• Resize Clipping Path on window resize in WPF

  - by blobkat

  Hello, I was wondering how to resize a Clipping path dynamically when resizing the window. Right now I'm taking a rectangle in Expression Blend that resizes with the window. Applying this rectangle to a circle as a clipping path makes the rectangle fixed, and it won't resize anymore. I've seen different ways of making clipping paths in XAML, in the Clip="" property as well as style markup. But I haven't succeeded yet in finding a proper XAML solution. Can anyone point me in the right direction? Thanks!

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• Replacing build.xml with Build.java - using Java and the Ant libraries as a build system

  - by Dean Schulze

  I've grown disillusioned with Groovy based alternatives to Ant. AntBuilder doesn't work from within Eclipse, the Groovy plugin for Eclipse is disappointing, and Gradle just isn't ready yet. The Ant documentation has a section titled "Using Ant Tasks Outside of Ant" which gives a teaser for how to use the Ant libraries from Java code. There's another example here: http://www.mail-archive.com/[email protected]/msg16310.html In theory it seems simple enough to replace build.xml with Build.java. The Ant documentation hints at some undocumented dependencies that I'll have to discover (undocumented from the point of view of using Ant from within Java). Given the level of disappointment with Ant scripting, I wonder why this hasn't been done before. Perhaps it has and isn't a good build system. Has anyone tried writing build files in Java using the Ant libraries?

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• Space partitioning algorithm

  - by Karol Kolenda

  I have a set of points which are contained within the rectangle. I'd like to split the rectangles into subrectangles based on point density (giving a number of subrectangles or desired density, whichever is easiest). The partitioning doesn't have to be exact (almost any approximation better than regular grid would do), but the algorithm have to cope with the large number of points - approx. 200 millions. The desired number of subrectangles however is substantially lower (around 1000). Does anyone knows any algorithm which may help me with this particular task?

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• Display Time Based Gannt charts using JavaScript

  - by Hari

  Hi All, We are using fusion charts for time based gantt charts. But these charts are not getting displayed as they require flash plug-in which is not supproted by iPhone. So I'm looking for pure javascript charts to get the same type of charts but I have not found any! I would appreciate if you can point me to right direction. If there are no such links then ,please let me know how we can create these type of charts using JS. I'm looking for following type of charts http://www.fusioncharts.com/widgets/Gallery/Gantt11.html?width=650&height=490 Thanks, Hari

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• What is the meaning of NSXMLParserErrorDomain error 5.?

  - by mobibob

  Ok, I am back on this task. I have my XML properly download from my webserver with a URL pointing to the server's file, however, when I detect the network is 'unreachable' I simply point the URL to my application's local XML and I get the following error (N.B. the file is a direct copy of the one on the server). I cannot find detail description, but I think it is saying that the URL is pointing to an inaccessible location. Am I storing this resource in the wrong location? I think I want it in the HomeDirectory / Library?? Debug output loadMyXml: /var/mobile/Applications/950569B0-6113-48FC-A184-4F1B67A0510F/MyApp.app/SampleHtml.xml 2009-10-14 22:08:17.257 MyApp[288:207] Wah! It didn't work. Error Domain=NSXMLParserErrorDomain Code=5 "Operation could not be completed. (NSXMLParserErrorDomain error 5.)" 2009-10-14 22:08:17.270 MyApp[288:207] Operation could not be completed. (NSXMLParserErrorDomain error 5.)

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• C# How to check if an FTP Directory Exists

  - by Billy Logan

  Hello Everyone, Looking for the best way to check for a given directory via FTP. currently i have the following code: private bool FtpDirectoryExists(string directory, string username, string password) { try { var request = (FtpWebRequest)WebRequest.Create(directory); request.Credentials = new NetworkCredential(username, password); request.Method = WebRequestMethods.Ftp.GetDateTimestamp; FtpWebResponse response = (FtpWebResponse)request.GetResponse(); } catch (WebException ex) { FtpWebResponse response = (FtpWebResponse)ex.Response; if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable) return false; else return true; } return true; } This returns false whether the directory is there or not. Can someone point me in the right direction. Thanks in advance, Billy

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• How can I set initial values when using Silverlight DataForm and .Net RIA Services DomainDataSource?

  - by TheDuke

  I'm experimenting with .Net RIA and Silverlight, I have a few of related entities; Client, Project and Job, a Client has many Projects, and a Project has many Jobs. In the Silverlight app, I'm uisng a DomainDataSource, and DataForm controls to perform the CRUD operations. When a Client is selected a list of projects appears, at which point the user can add a new project for that client. I'd like to be able to fill in the value for client automatically, but there doesn't seem to be any way to do that, while there is an AddingNewItem event on the DataForm control, it seems to fire before the DataForm has an instance of the new object and I'm not sure trawling through the ChangeSet from the DomainDataSource SubmittingChanges event is the best way to do this. I would of thought this would of been an obvious feature... anyone know the best way to achieve this functionality?

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• Pass Dictionary of routeValues to ActionLink

  - by Graham

  All, Getting to grips with ASP.NET MVC. So far, so good, but this one is a little nuts. I have a view model that contains a dictionary of attributes for a hyperlink, used like this: menu = model variable Html.ActionLink(Html.Encode(menu.Name), Html.Encode(menu.Action), Html.Encode(menu.Controller), menu.Attributes, null) The problem is the position of "menu.Attributes" expects an object in the form: new { Name = "Fred", Age=24 } From what I can tell, this anonymous object is actually converted to a dictionary via reflection anyway BUT you can't pass a dictionary to it in the first place!!! The Html generated for the link simply shows the dictionary type. How on earth do I get round this? The whole point is that its general and the controller can have set the menu.Attributes previously....

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• Please explain some of Paul Graham's points on LISP

  - by kunjaan

  I need some help understanding some of the points from Paul Graham's article http://www.paulgraham.com/diff.html A new concept of variables. In Lisp, all variables are effectively pointers. Values are what have types, not variables, and assigning or binding variables means copying pointers, not what they point to. A symbol type. Symbols differ from strings in that you can test equality by comparing a pointer. A notation for code using trees of symbols. The whole language always available. There is no real distinction between read-time, compile-time, and runtime. You can compile or run code while reading, read or run code while compiling, and read or compile code at runtime. What do these points mean How are they different in languages like C or Java? Do any other languages other than LISP family languages have any of these constructs now?

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• How to load a UIView from a NIB?

  - by Winder

  I have been using UIViewControllers and initWithNibName with much success, basically using them as a convenient way to design the view with Interface Builder. Unfortunately I have built a hierarchy of views before noticing this line in the UIViewController documentation: Note: You should not use view controllers to manage views that fill only a part of their window My question is this: Having a very simple NIB that only has a UIView in addition to the default First Responder and Owning Object, what is the simplest way to load the UIView into my code? I have not been able to get loadNibNamed:owner:options: to work at this point, but suspect the answer will involve it somehow.

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• Overriding Equals method in Structs

  - by devoured elysium

  I've looked for overriding guidelines for structs, but all I can find is for classes. At first I thought I wouldn't have to check to see if the passed object was null, as structs are value types and can't be null. But now that I come to think of it, as equals signature is public bool Equals(object obj) it seems there is nothing preventing the user of my struct to be trying to compare it with an arbitrary reference type. My second point concerns the casting I (think I) have to make before I compare my private fields in my struct. How am I supposed to cast the object to my struct's type? C#'s as keyword seems only suitable for reference types. Thanks

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