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  • How does an unsharp mask work?

    - by Bob Aman
    I've been playing around with image processing lately, and I'd like to know how the unsharp mask algorithm works. I'm looking at the source code for Gimp and it's implementation, but so far I'm still in the dark about how it actually works. I need to implement it for a project I'm working on, but I'd like to actually understand the algorithm I'm using.

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  • Invert a stack, without using extra data structures?

    - by vks
    How would you invert a stack, without using extra data structures, like a second, or temporary, stack. Thus no stack1-stack2 or stack-queue-stack implementation in the answer. You just have access to push/pop feature of a standard stack. I think there is way to do it by keeping a global counter and using pointer manipulation. If I solve it myself, I will post it. If someone else figures it out, please post your solution.

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  • Simple thread-safe non-blocking file logger class in c#

    - by Jason Renlan
    I have a web application, that will log some information to a file. I am looking for a simple thread-safe non-blocking file logger class in c#. I have little experience with threading. I known there are great logging components out there like log4Net, Enterprise Library Logging Block, ELMAH, but I do not want an external dependence for my application. I was thinking about using this queue implementation http://www.codeproject.com/KB/cpp/lockfreeq.aspx

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  • Reed-Solomon encoder for embedded application (memory-efficient)

    - by bjarkef
    Hi I am looking for a very memory-efficient (like max. 500 bytes of memory for lookup tables etc.) implementation of a Reed-Solomon encoder for use in an embedded application? I am interested in coding blocks of 10 bytes with 5 bytes of parity. Speed is of little importance. Do you know any freely available implementations that I can use for this purpose? Thanks in advance.

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  • COM IUnknown and do I need a pointer to it first before calling CoGetClassObject?

    - by Tony
    In COM, when you want to create an instance of some COM Server object, do you first need to get a pointer to it's IUnknown interface and only then create a class object using CoGetClassObject? As far as I understand it, IUnknown is used to manage object lifetimes, so from my understanding, whatever object the client wants to create, one needs a pointer to it's IUnknown interface implementation first. Sound correct? If not, can anyone tell me how it works?

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  • Hibernate GenericDAO for parent/child relationships and DAO/DTO patterns

    - by Marco
    Hi, I'm looking for a Generic DAO implementation in Hibernate that includes parent/child relationship management (adding, removing, getting childs, setting parents, etc). Actually the most used generic DAO on the web is the one i found on http://community.jboss.org/wiki/GenericDataAccessObjects. And also, i was looking for some DAO/DTO sample implementations and design patterns. Do you know some good resources out there?

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  • VU meter implementaion in iphone

    - by Sreelal
    Hi, I am developing an aplication for iphone which records audio and save that audio file .I need to create a UI similar to that in Voice Memo app with VU meter .I implemented codes to record audio,but i have no idea about VU meter implementation.Looking forward for a reply ......Thanks in advance

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  • running my own jabber/xmpp server

    - by akshay
    Can i make my own jabber server.So that if i run my website xyz then people should be be able to get theri jabber id from my website by registering on my website. Is there any open source implementation of jabber server that i can use?

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  • Showing login view controller before main tab bar controller

    - by Padawan
    I'm creating an iPad app with a tab bar controller that requires login. So on launch, I want to show a LoginViewController and if login is successful, then show the tab bar controller. This is how I implemented an initial test version (left out some typical header stuff, etc)... AppDelegate.h: @interface AppDelegate_Pad : NSObject <UIApplicationDelegate, LoginViewControllerDelegate> { UIWindow *window; UITabBarController *tabBarController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UITabBarController *tabBarController; @end AppDelegate.m: @implementation AppDelegate_Pad @synthesize window; @synthesize tabBarController; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { LoginViewController_Pad *lvc = [[LoginViewController_Pad alloc] initWithNibName:@"LoginViewController_Pad" bundle:nil]; lvc.delegate = self; [window addSubview:lvc.view]; //[lvc release]; [window makeKeyAndVisible]; return YES; } - (void)loginViewControllerDidFinish:(LoginViewController_Pad *)loginViewController { [window addSubview:tabBarController.view]; } - (void)dealloc {...} @end LoginViewController_Pad.h: @protocol LoginViewControllerDelegate; @interface LoginViewController_Pad : UIViewController { id<LoginViewControllerDelegate> delegate; } @property (nonatomic, assign) id <LoginViewControllerDelegate> delegate; - (IBAction)buttonPressed; @end @protocol LoginViewControllerDelegate -(void)loginViewControllerDidFinish:(LoginViewController_Pad *)loginViewController; @end LoginViewController_Pad.m: @implementation LoginViewController_Pad @synthesize delegate; ... - (IBAction)buttonPressed { [self.view removeFromSuperview]; [self.delegate loginViewControllerDidFinish:self]; } ... @end So the app delegate adds the login view controller's view on launch and waits for login to call "did finish" using a delegate. The login view controller calls removeFromSuperView before it calls didFinish. The app delegate then calls addSubView on the tab bar controller's view. If you made it up to this point, thanks, and I have three questions: MAIN QUESTION: Is this the right way to show a view controller before the app's main tab bar controller is displayed? Even though it seems to work, is it a proper way to do it? If I comment out the "lvc release" in the app delegate then the app crashes with EXC_BAD_ACCESS when the button on the login view controller is pressed. Why? With the "lvc release" commented out everything seems to work but on the debugger console it writes this message when the app delegate calls addSubView for the tab bar controller: Using two-stage rotation animation. To use the smoother single-stage animation, this application must remove two-stage method implementations. What does that mean and do I need to worry about it?

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  • glib2 64-bit compile fails on Solaris 10

    - by Aaron
    I'm encountering a problem building glib-2.26.1 on a Solaris 10 box - 64-bit. Goo diligence doesn't turn anything up, but no matter what I do the build fails in the same way. I've tried using the Sun Studio compiler, gcc (SFW) to no avail. When I compile I get the following error: [root@foo glib-2.26.1]$ export CC=/opt/solstudio12.2/bin/cc [root@foo glib-2.26.1]$ export CFLAGS="-m64" ...configure goes normally... [root@foo glib-2.26.1]$ make ...snip... source='gatomic.c' object='gatomic.lo' libtool=yes \ DEPDIR=.deps depmode=none /bin/bash ../depcomp \ /bin/bash ../libtool --tag=CC --mode=compile /opt/solstudio12.2/bin/cc -DHAVE_CONFIG_H -I. -I.. -I.. -I../glib -I../glib -I.. -DG_LOG_DOMAIN=\"GLib\" -DG_DISABLE_CAST_CHECKS -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -DPCRE_STATIC -DG_DISABLE_SINGLE_INCLUDES -D_REENTRANT -D_PTHREADS -m64 -c -o gatomic.lo gatomic.c libtool: compile: /opt/solstudio12.2/bin/cc -DHAVE_CONFIG_H -I. -I.. -I.. -I../glib -I../glib -I.. -DG_LOG_DOMAIN=\"GLib\" -DG_DISABLE_CAST_CHECKS -DG_DISABLE_DEPRECATED -DGLIB_COMPILATION -DPCRE_STATIC -DG_DISABLE_SINGLE_INCLUDES -D_REENTRANT -D_PTHREADS -m64 -c gatomic.c -KPIC -DPIC -o .libs/gatomic.o "gatomic.c", line 885: warning: no explicit type given "gatomic.c", line 885: syntax error before or at: * "gatomic.c", line 885: warning: old-style declaration or incorrect type for: g_atomic_mutex "gatomic.c", line 906: warning: implicit function declaration: g_mutex_lock "gatomic.c", line 909: warning: implicit function declaration: g_mutex_unlock "gatomic.c", line 1155: warning: implicit function declaration: g_mutex_new "gatomic.c", line 1155: warning: improper pointer/integer combination: op "=" cc: acomp failed for gatomic.c make[4]: *** [gatomic.lo] Error 1 make[4]: Leaving directory `/root/glib-2.26.1/glib' make[3]: *** [all-recursive] Error 1 make[3]: Leaving directory `/root/glib-2.26.1/glib' make[2]: *** [all] Error 2 make[2]: Leaving directory `/root/glib-2.26.1/glib' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/root/glib-2.26.1' make: *** [all] Error 2 Does anyone know where the build might be going wrong? Not sure where else to look here. Thanks.

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  • google-app-engine-django: authentication without Google accounts?

    - by cv12
    google-app-engine-django/ claims to have an "App Engine compatible implementation of the Django authentication framework". Does this authentication work only with Google Accounts? Is it possible to register a user with a username/password and authenticate him/her with that username/password without that user having a Google account? I would appreciate any pointers to how this could be done with google-app-engine-django without Google Accounts authentication.

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  • Draw arrow on line algorithm

    - by nunos
    Does anyone have an algorithm for drawing an arrow in the middle of a given line. I have searched for google but haven't found any good implementation. P.S. I really don't mind the language, but it would be great if it was Java, since it is the language I am using for this. Thanks in advance.

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  • YUI - Pros and Cons

    - by StackOverflowNewbie
    I'm about to begin a new project and plan to use YUI and my JS and CSS framework for the following reasons: Treeview with tri-state checkboxes (seems to be the best implementation I could find) Calandar (seen others, but since #1 is on YUI, I'm glad it also has calendar) CSS framework (was going to use 960, but might as well go 100% Yahoo) I plan to use only 1 JS framework. Does anyone see any problems with my decision?

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  • Cruise Control.Net best practices

    - by Nasser Hajloo
    I'm going to implement a CI process with CC.NET so I'm looking for best practices for CC.net implementation. I use SVN as source control and JIRA as an issue tracker (if it's a useful tip). Any recommandation or article suggestion will be appreciated. Note: I read this article by Martin Fowler.

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  • Are iframes a terrible idea?

    - by jamtoday
    I'm building a widget, and I've been using iframes to present content within it. At some point, I might start serving third party HTML and JS, so I thought iframes would be a good idea. It does make the widget javascript a little more complicated, and I'm concerned that this might not be the best implementation. Do you have any advice? It would be a huge help to hear what other people think about iframes.

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  • implement a coverflow UI in an Android web application

    - by ravidor
    I am trying to build a coverflow UI on an Android web application using HTML,CSS, JavaScript and some images. CSS 3D transforms, which are supported in Safari sine 2009 and on the iPhone since version 2.0, is not supported well on the Android. worse then that, the implementation is buggy on Android 2.1 and Android 2.2, and in each version in a different way. Any idea how can I build a coverflow UI on an Android web application using HTML,CSS, JavaScript and some images without CSS 3D transforms?

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  • What are the disadvantages to declaring Scala case classes?

    - by Graham Lea
    If you're writing code that's using lots of beautiful, immutable data structures, case classes appear to be a godsend, giving you all of the following for free with just one keyword: Everything immutable by default Getters automatically defined Decent toString() implementation Compliant equals() and hashCode() Companion object with unapply() method for matching But what are the disadvantages of defining an immutable data structure as a case class? What restrictions does it place on the class or its clients? Are there situations where you should prefer a non-case class?

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  • How to share classes between DLLs

    - by Jamie Hale
    I have an unmanaged Win32 C++ application that uses multiple C++ DLLs. The DLLs each need to use class Foo - definition and implementation. Where do Foo.h and Foo.cpp live so that the DLLs link and don't end up duplicating code in memory? Is this a reasonable thing to do?

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  • DUnit: How to run tests?

    - by Ian Boyd
    How do i run TestCase's from the IDE? i created a new project, with a single, simple, form: unit Unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) private public end; var Form1: TForm1; implementation {$R *.DFM} end. Now i'll add a test case to check that pushing Button1 does what it should: unit Unit1; interface uses Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private public end; var Form1: TForm1; implementation {$R *.DFM} uses TestFramework; type TForm1Tests = class(TTestCase) private f: TForm1; protected procedure SetUp; override; procedure TearDown; override; published procedure TestButton1Click; end; procedure TForm1.Button1Click(Sender: TObject); begin //todo end; { TForm1Tests } procedure TForm1Tests.SetUp; begin inherited; f := TForm1.Create(nil); end; procedure TForm1Tests.TearDown; begin f.Free; inherited; end; procedure TForm1Tests.TestButton1Click; begin f.Button1Click(nil); Self.CheckEqualsString('Hello, world!', f.Caption); end; end. Given what i've done (test code in the GUI project), how do i now trigger a run of the tests? If i push F9 then the form simply appears: Ideally there would be a button, or menu option, in the IDE saying Run DUnit Tests: Am i living in a dream-world? A fantasy land, living in a gumdrop house on lollipop lane?

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  • ASP.NET MVC: Implementing an OpenID sign-in page ala NerdDinner v2

    - by pcampbell
    Consider the log in page on NerdDinner.com: http://www.nerddinner.com/Account/LogOn Some nice features: jQuery effects on the OpenID choice popups for the other major providers Is this revision of the NerdDinner AccountController and its View available for public download? How would you reinvent this implementation? Any code you can post would be fine. Calling Jon Galloway!

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