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  • C# - Determine if class initializaion causes infinite recursion?

    - by John M
    I am working on porting a VB6 application to C# (Winforms 3.5) and while doing so I'm trying to break up the functionality into various classes (ie database class, data validation class, string manipulation class). Right now when I attempt to run the program in Debug mode the program pauses and then crashes with a StackOverFlowException. VS 2008 suggests a infinite recursion cause. I have been trying to trace what might be causing this recursion and right now my only hypothesis is that class initializations (which I do in the header(?) of each class). My thought is this: mainForm initializes classA classA initializes classB classB initializes classA .... Does this make sense or should I be looking elsewhere? UPDATE1 (a code sample): mainForm namespace john { public partial class frmLogin : Form { stringCustom sc = new sc(); stringCustom namespace john { class stringCustom { retrieveValues rv = new retrieveValues(); retrieveValues namespace john { class retrieveValues { stringCustom sc = new stringCustom();

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  • Inheritance of Custom Attributes on Abstract Properties

    - by Marty Trenouth
    I've got a custom attribute that I want to apply to my base abstract class so that I can skip elements that don't need to be viewed by the user when displaying the item in HTML. It seems that the properties overriding the base class are not inheriting the attributes. Does overriding base properties (abstract or virtual) blow away attributes placed on the original property? From Attribute class Defination [AttributeUsage(AttributeTargets.Property, Inherited = true, AllowMultiple = false)] public class NoHtmlOutput : Attribute { } From Abstract Class Defination [NoHtmlOutput] public abstract Guid UniqueID { get; set; } From Concrete Class Defination public override Guid UniqueID{ get{ return MasterId;} set{MasterId = value;}} From class checking for attribute Type t = o.GetType(); foreach (PropertyInfo pi in t.GetProperties()) { if (pi.GetCustomAttributes(typeof(NoHtmlOutput), true).Length == 1) continue; // processing logic goes here }

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  • Cannot run a JUnit test case containing threads from Eclipse

    - by Parag
    I am running JUnit test case from Eclipse 3.4.1 . This test case creates a class which starts a thread to do some stuff. When the test method ends it seems that Eclipse is forcibly shutting down the thread. If I run the same test from the command line, then the thread runs properly. Somehow I do not remember running into such problems with Eclipse before. Is this something that was always present in Eclipse or did they add it in 3.4.x ? Here is an example: When I run this test from Eclipse, I get a few printts of the cnt (till about 1800) and then the test case is terminated utomatically. However, if I run the main method, which starts JUnit's TestRunner, then the thread counts indefinetely. import junit.framework.TestCase; import junit.textui.TestRunner; /** * This class shows that Eclipses JUnit test case runner will forcibly * terminate all running threads * * @author pshah * */ public class ThreadTest extends TestCase { static Runnable run = new Runnable() { public void run() { int cnt = 0; while(true) System.out.println(cnt++); } }; public void testThread() { Thread t = new Thread(run); t.start(); } public static void main(String args[]) { TestRunner runner = new TestRunner(); runner.run(ThreadTest.class); } }

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  • httpd.conf for case-insensitive file serving

    - by Anton Gogolev
    I'm a complete newbie with regard to managing Apache, so excuse me if I'm phrasing something incorrectly. I have a web site -- say, http://domain.com. The problem is that when I try to open http://domain.com/index.html in a web browser it displays the page, but when I attempt to access http://domain.com/Index.html (note capital I), it responds with HTTP 404. How do I configure Apache to serve both these files (and directories, for that matter) in a case-insensitive manner? Current httpd.conf is here. EDIT Dan C, thanks for a hint. I basically want to allow users to download files from my server and don't really want them to be aware that Index.html and index.html are in fact different. I'm also very willing to know as to what are the ramifications of this decision.

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  • Why is Collection<String>.class Illegal?

    - by Peter
    I am puzzled by generics. You can declare a field like: Class<Collection<String>> clazz = ... It seems logical that you could assign this field with: Class<Collection<String>> clazz = Collection<String>.class; However, this generates an error: Syntax error on token ">", void expected after this token So it looks like the .class operator does not work with generics. So I tried: class A<S> {} class B extends A<String> {} Class<A<String>> c = B.class; Also does not work, generates: Type mismatch: cannot convert from Class<Test.StringCollection> to Class<Collection<String>> Now, I really fail to see why this should not work. I know generic types are not reified but in both cases it seems to be fully type safe without having access to runtime generic types. Anybody an idea? Peter Kriens

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  • characteristics of the abstract class

    - by Harsha
    Hello All, I like to know what makes a class to be called as absract class. I believe, abract key word definetly make a class class, but if one takes out the keyword, then we can create the instance of the class. In otherwords, what are the characteristics of the abstract class. Thanks in advance. -Harsha

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  • How to "escape" the JavaScript class keyword to specify a CSS class value.

    - by Robert Claypool
    C# allows a reserved word to be used as a property name via the ampersand. e.g. // In ASP.NET MVC, we use @class to define // the css class attribute for some HtmlHelper methods. var htmlObject = new { readonly = "readonly", @class = "ui-state-highlight" } I want to do the same in JavaScript. e.g. function makeGrid(grid, pager) { grid.jqGrid({ caption: 'Configurations', colNames: ['Id', 'Name'], colModel: [ { name: 'Id', index: 'Id' }, { name: 'Name', index: 'Name', editable: true, editoptions: { readonly: 'readonly', class: 'FormElement readonly' } }, ], pager: pager, url: 'www.example.com/app/configurations") %>', editurl: 'www.example.com/app/configurations/edit") %>' }).navGrid(pager, { edit: true, add: false, del: false, search: false }, {}, {}, {}); } Note class: 'FormElement readonly' is supposed to set the css class value on jqGrid's edit dialog, but IE errors out on the reserved word. Is there an escape character in JavaScript too? #class? @class? &class? Otherwise, how might I tell jqGrid to set the css class on the popup editor? Thank you.

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  • Classification: Dealing with Abstain/Rejected Class

    - by abner.ayala
    I am asking for your input and/help on a classification problem. If anyone have any references that I can read to help me solve my problem even better. I have a classification problem of four discrete and very well separated classes. However my input is continuous and has a high frequency (50Hz), since its a real-time problem. The circles represent the clusters of the classes, the blue line the decision boundary and Class 5 equals the (neutral/resting do nothing class). This class is the rejected class. However the problem is that when I move from one class to the other I activate a lot of false positives in the transition movements, since the movement is clearly non-linear. For example, every time I move from class 5 (neutral class) to 1 I first see a lot of 3's before getting to the 1 class. Ideally, I will want my decision boundary to look like the one in the picture below where the rejected class is Class =5. Has a higher decision boundary than the others classes to avoid misclassification during transition. I am currently implementing my algorithm in Matlab using naive bayes, kNN, and SVMs optimized algorithms using Matlab. Question: What is the best/common way to handle abstain/rejected classes classes? Should I use (fuzzy logic, loss function, should I include resting cluster in the training)?

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  • Binding functions of derived class with luabind

    - by Anamon
    I am currently developing a plugin-based system in C++ which provides a Lua scripting interface, for which I chose to use luabind. I'm using Lua 5 and luabind 0.9, both statically linked and compiled with MSVC++ 8. I am now having trouble binding functions with luabind when they are defined in a derived class, but not its parent class. More specifically, I have an abstract base class called 'IPlugin' from which all plugin classes inherit. When the plugin manager initialises, it registers that class and its functions like this: luabind::open(L); luabind::module(L) [ luabind::class_("IPlugin") .def("start", (void(IPlugin::*)())&IPlugin::start) ]; As it is only known at runtime what effective plugin classes are available, I had to solve loading plugins in a kind of roundabout way. The plugin manager exposes a factory function to Lua, which takes the name of a plugin class and a desired object name. The factory then creates the object, registers the plugin's class as inheriting from the 'IPlugin' base class, and immediately calls a function on the created object that registers itself as a global with the Lua state, like this: void PluginExample::registerLuaObject(lua_State *L, string a_name) { luabind::globals(L)[a_name] = (PluginExample*)this; } I initially did this because I had problems with Lua determining the most derived class of the object, as if I register it from the StreamManager it is only known as a subtype of 'IPlugin' and not the specific subtype. I'm not sure anymore if this is even necessary though, but it works and the created object is subsequently accessible from Lua under 'a_name'. The problem I have, though, is that functions defined in the derived class, which were not declared at all in the parent class, cannot be used. Virtual functions defined in the base class, such as 'start' above, work fine, and calling them from Lua on the new object runs the respective redefined code from the 'PluginExample' class. But if I add a new function to 'PluginExample', here for example a function taking no arguments and returning void, and register it like this: luabind::module(L) [ luabind::class_("PluginExample") .def(luabind::constructor()) .def("func", &PluginExample::func) ]; calling 'func' on the new object yields the following Lua runtime error: No matching overload found, candidates: void func(PluginExample&) I am correctly using the ':' syntax so the 'self' argument is not needed and it seems suddenly Lua cannot determine the derived type of the object anymore. I am sure I am doing something wrong, probably having to do with the two-step binding required by my system architecture, but I can't figure out where. I'd much appreciate some help =)

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  • Cron won't use msmtpd to send emails in case of failed cronjob

    - by Glister
    I'm trying to configure a machine so that it will send me an email if one of the cronjobs output something in case of an error. I'm using Debian Wheezy. Cron is working normally (without the email functionality). msmtp is installed and configured. Have already symlinked /usr/{bin|sbin}/sendmail to /usr/bin/msmtpd. I can send email by using: echo "test" | mail -s "subject" [email protected] or by executing: echo "test" | /usr/sbin/sendmail Without the symlink (/usr/sbin/sendmail) cron will tell me that: (CRON) info (No MTA installed, discarding output) With the symlinks I get: (root) MAIL (mailed 1 byte of output; but got status 0x004e, #012) Can you suggest how to config the cron/msmtp pair? Thanks!

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  • Adding active class in menu only works on first page

    - by rileychuggins
    I have nav links that become active once they come into the window. I need to implement this on three separate pages on my website but the following scripts only work for the first page. var services_refresh = function () { // do stuff console.log('Stopped Scrolling'); if($('#ct_scans.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#ct_scans"]').addClass('active'); } else if($('#xray.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#xray"]').addClass('active'); } else if($('#fluoroscopy.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#fluoroscopy"]').addClass('active'); } else if($('#mri.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#mri"]').addClass('active'); } else if($('#neuroimaging.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#neuroimaging"]').addClass('active'); } else if($('#nuclear_medicine.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#nuclear_medicine"]').addClass('active'); } else if($('#ultrasound.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#ultrasound"]').addClass('active'); } else if($('#mammography.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#mammography"]').addClass('active'); } else if($('#breast_ultrasound.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#breast_ultrasound"]').addClass('active'); } else if($('#breast_biopsy.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#breast_biopsy"]').addClass('active'); } else if($('#breast_mri.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#breast_mri"]').addClass('active'); } else if($('#osteoporosis.anchor').visible()) { $('#our_services_sub_sections li a').removeClass('active'); $('#our_services_sub_sections li a[href="#osteoporosis"]').addClass('active'); } }; Here is my HTML for the first page that works: <ul id="our_services_sub_sections" class="diagnostic_images"> <li><a class="scroll active" href="#ct_scans">CT Scans</a></li> <li><a class="scroll" href="#xray">X-Ray</a></li> <li><a class="scroll" href="#fluoroscopy">Fluoroscopy</a></li> <li><a class="scroll" href="#mri">MRI</a></li> <li><a class="scroll" href="#neuroimaging">Neuroimaging</a></li> <li><a class="scroll" href="#nuclear_medicine">Nuclear Medicine</a></li> <li><a class="scroll" href="#ultrasound">Ultrasound</a></li> </ul> Here is my HTML for the second page which does not work: <ul id="our_services_sub_sections" class="womens_imaging"> <li><a class="scroll active" href="#mammography">Mammography</a></li> <li><a class="scroll" href="#breast_ultrasound">Breast Ultrasound</a></li> <li><a class="scroll" href="#breast_biopsy">Breast Biopsy</a></li> <li><a class="scroll" href="#breast_mri">Breast MRI</a></li> <li><a class="scroll osteo" href="#osteoporosis">Osteoporosis<br />Evaluation (DEXA)</a></li> </ul> Why is this not working?

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  • Passing Interface Class as a Parameter in Java

    - by aleclerc
    I have an interface: public interface IMech { } and a class that implements it public class Email implements IMech { } and a third class that has this method implemented: public void sendNotification( Class< IMech > mechanism ){ } now I'm trying to call that method like so foo.sendNotification(Email.class); but i keep getting an exception saying: The method sendNotification(Class<IMechanism>) in the type RemediationOperator is not applicable for the arguments (Class<EmailNotification>) Shouldn't this work if it interfaces that class?

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  • PHP Nested classes work... sort of?

    - by SeanJA
    So, if you try to do a nested class like this: //nestedtest.php class nestedTest{ function test(){ class E extends Exception{} throw new E; } } You will get an error Fatal error: Class declarations may not be nested in [...] but if you have a class in a separate file like so: //nestedtest2.php class nestedTest2{ function test(){ include('e.php'); throw new E; } } //e.php class E Extends Exception{} So, why does the second hacky way of doing it work, but the non-hacky way of doing it does not work?

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  • Loop append div and repeat

    - by Diego Vieira
    I have this code <div class="round-3-top"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> <div class="round-3-bottom"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> But i want generate dynamically, how i do that? Ex.: i have 4 rounds, this would be the generated code <div class="round-4-top"> <div class="round-3-top"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> <div class="round-3-bottom"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> </div> <div class="round-4-bottom"> <div class="round-3-top"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> <div class="round-3-bottom"> <div class="round-2-top"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> <div class="round-2-bottom"> <div class="round-1-top"></div> <div class="round-1-bottom"></div> </div> </div> </div> I try using TagBuilder in MVC C# but I can not do. What should happen is, if you are 3 rounds, adding he should go inside each div is like the example above. Any idea how can I develop it?

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  • Singleton class issue in Qt

    - by sijith
    i created a singleton class and trying to access that class in other class but getting error "cannot access private member" Setupconfig is my singleton class and i am trying to access this class in other class which have QMainWindow Error 'Setupconfig::Setupconfig' : cannot access private member declared in class 'Setupconfig' ///////////////////////////////////////////////////////////////////// Setupconfig.h static Setupconfig *buiderObj() { static Setupconfig *_setupObj= new Setupconfig(); return _setupObj; } private: Setupconfig(); ////////////////////////////////////// EasyBudget.h class EasyBudget : public QMainWindow, public Ui::EasyBudgetClass, public Setupconfig { Q_OBJECT public: Setupconfig *setupObj; } ////////////////////////////////////// EasyBudget.cpp EasyBudget::EasyBudget(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent,Qt::FramelessWindowHint) { setupObj=Setupconfig::buiderObj(); }

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  • Switch/case without break inside DllMain

    - by Sherwood Hu
    I have a Dllmain that allocates Thread local storage when a thread attaches to this DLL. Code as below: BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) { LPVOID lpvData; BOOL fIgnore; switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: onProcessAttachDLL(); // Allocate a TLS index. if ((dwTlsIndex = TlsAlloc()) == TLS_OUT_OF_INDEXES) return FALSE; // how can it jump to next case??? case DLL_THREAD_ATTACH: // Initialize the TLS index for this thread. lpvData = (LPVOID) LocalAlloc(LPTR, MAX_BUFFER_SIZE); if (lpvData != NULL) fIgnore = TlsSetValue(dwTlsIndex, lpvData); break; ... } I know that for the main thread, the DLL_THREAD_ATTACH is not entered, as per Microsoft Documentation. However, the above code worked. I am using VC2005. When I entered the debugger, I saw that after it entered DLL_THREAD_ATTACH case when ul_reason_for_call = 1! How can that happen? If I add `break' at the end of DLL_PROCESS_ATTACH block, the DLL failed to work. How can this happen?

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  • How to make UIImagePickerController works under switch case UIActionSheet

    - by Phy
    -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *tempImage = [info objectForKey:UIImagePickerControllerOriginalImage]; imgview.image = tempImage; [self dismissModalViewControllerAnimated:YES]; [picker release]; } -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { [self dismissModalViewControllerAnimated:YES]; [picker release]; } -(IBAction) calllib { img1 = [[UIImagePickerController alloc] init]; img1.delegate = self; img1.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; [self presentModalViewController:img1 animated:YES]; } all the codes above works well for taking out photos from the photo library. problem is that when i tried to use it under the UIActionSheet it does not work. i just copy the lines of codes from the -(IBAction) calllib as follow. (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex { UIImage *detectface = [Utilities detectFace:imgview.image]; UIImage *grayscale = [Utilities grayscaleImage:imgview.image]; UIImage *avatars = [Utilities avatars:imgview.image]; img1 = [[UIImagePickerController alloc] init]; img1.delegate = self; img1.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; switch (buttonIndex) { case 0: [self presentModalViewController:img1 animated:YES]; imgview.image = detectface; break; case 1: [self presentModalViewController:img1 animated:YES]; imgview.image = grayscale; break; case 2: [self presentModalViewController:img1 animated:YES]; imgview.image = avatars; break; default: break; } } it does not work. can somebody help me to figure out what is the problem? the switch case works perfectly without the [self presentModalViewController:img1 animated:YES]; ... thanks

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  • Solution for storing sata drives outside of case

    - by Jeffrey Kevin Pry
    I have a system that has 8 sata disks in a software raid 5 array using mdadm. My issue is that I want to move the drives from inside of the computer case in order to cool more efficiently. I have looked all over the web and only seem to find enclosures that hide the drives connectors behind an estata port or some other internal raid controller. Basically what I want is an enclosure or equivalent that I can run independent sata cables to and either power as well, or have it have its own power supply. I have the sata ports on the motherboard available and don't want to limit io by using one port with a multiplier or the like. One final caveat, I am a college student on a budget and don't have a fortune to spend on such an enclosure. Thanks in advance for your help and advice.

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  • Nested class with hidden constructor impossible in c#?

    - by luckyluke
    I' ve been doing some programming lately and faced an issue which i found weird in c#. (at least for me) public class Foo { //whatever public class FooSpecificCollection : List<Bar> { //implementation details } public FooSpecificCollection GetFoosStuff() { //return the collection } } I want the consumer of Foo to be able to obtain a reference to FooSpecificCollection, even perform some operations on it. Maybe even set it to some other property of Foo or smth like that, but not To be able to CREATE an instance of this class. (the only class that should be able to instatiate this collection should be Foo. Is my request really that far-fetched? I know that people way smarter defined c# but shouldn't there be such an option that a parent class can create a nested class instance but nobody else can't. So far I created a solution to make an abstract class, or interface available through the property and implement a concrete private class that is not available anywhere else. Is this a correct way to handle such a situation.?

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  • Workaround for abstract attributes in Java

    - by deamon
    In Scala I would write an abstract class with an abstract attribute path: abstract class Base { val path: String } class Sub extends Base { override val path = "/demo/" } Java doesn't know abstract attributes and I wonder what would be the best way to work around this limitation. My ideas: a) constructor parameter abstract class Base { protected String path; protected Base(String path) { this.path = path; } } class Sub extends Base { public Sub() { super("/demo/"); } } b) abstract method abstract class Base { // could be an interface too abstract String getPath(); } class Sub extends Base { public String getPath() { return "/demo/"; } } Which one do you like better? Other ideas? I tend to use the constructor since the path value should not be computed at runtime.

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  • Selecting first instance of class but not nested instances via jQuery

    - by DA
    Given the following hypothetical markup: <ul class="monkey"> <li> <p class="horse"></p> <p class="cow"></p> </li> </ul> <dl class="monkey"> <dt class="horse"></dt> <dd class="cow"> <dl> <dt></dt> <dd></dd> </dl> <dl class="monkey"> <dt class="horse"></dt> <dd class="cow"></dd> </dl> </dd> </dl> I want to be able to grab the 'first level' of horse and cow classes within each monkey class. But I don't want the NESTED horse and cow classes. I started with .children, but that won't work with the UL example as they aren't direct children of .monkey. I can use find: $('.monkey').find('.horse, .cow') but that returns all instances, including the nested ones. I can filter the find: $('.monkey').find('.horse, .cow').not('.cow .horse, .cow .cow') but that prevents me from selecting nested instances on a second function call. So...I guess what I'm looking for is 'find first "level" of this descendant'. I could likely do this with some looping logic, but was wondering if there is a selector and/or some combo of selectors that would achieve that logic.

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