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qt q object vtable error Abercrombie, North Dakota

It's not enough to use the compiler default constructor/destructors. Add the header file name to [...].pro file HEADERS variable. Reply With Quote + Reply to Thread Quick Navigation Qt Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums Qt Newbie Qt Programming Qwt Qt Destructor GpsLocator::~GpsLocator() { } To copy to clipboard, switch view to plain text mode Can anyone clearify what I need to do to get rid of this error please?

Mathematics tenure-track committees: Mathjobs question Would the phrase, "in my area," be a non-restrictive clause? Advanced Search Forum Qt Qt Programming QOBJECT and undefined reference to vtable errors If this is your first visit, be sure to check out the FAQ by clicking the link above. This may solve your problem. there's a typo at > recive < You forgot to call the QObject constructor in your constructor (in the initializer list). (It doesn't resolve the error though) share|improve this answer answered

Last edited by stargazer; 11th January 2011 at 17:11. Recommended off-line reading: The Foundations of Qt Development (ISBN: 1-59059-831-8) Reply With Quote 25th April 2011,05:29 #8 OnlyK View Profile View Forum Posts View Blog Entries View Articles Beginner Join Date Mar 5, 2011 at 12:59pm UTC coder777 (5973) Try a virtual destructor virtual ~FCrypt(); Mar 5, 2011 at 6:04pm UTC thokra (29) @fafner: You're using the Q_OBJECT macro. This is not one of my classes but part of an open source project that is licencsed under GNU.

Last edited by stargazer; 12th January 2011 at 10:41. What is summer in Spanish? "Estío" vs "verano" What does "they are facing their chest and shoulder" mean in this paragraph? Since class definitions are required to be the same on every occurrence by the ODR, this is safe. From the command line, just using make normally also updates some qmake-related stuff, but apparently not enough.

just after loading the dynamic library StelModule* GpsLocatorStelPluginInterface::getStelModule() const { // return new GpsLocator(); return false; } StelPluginInfo GpsLocatorStelPluginInterface::getPluginInfo() const { // Allow to load the resources when used as a The First Draw of the BarelySocket! How do I find out if there is an Esperanto club in my city? Dynamically loaded plug-inclass GpsLocator : public StelModule{ Q_OBJECTpublic: GpsLocator(); virtual ~GpsLocator();};/* COMMENTED OUT FOR TESTING virtual ~GpsLocator(); // Methods defined in StelModule class virtual void init(); virtual void update(double deltaTime); virtual

The comment after the class header is interesting and may be relevant, but I'm not sure what it means, except that evidently someone was having trouble with moc... Only when in a header file does the presence of Q_OBJECT in a class definition cause moc to be invoked. The easiest way to force qmake to be run is to make some insignificant changes to the project file to update its timestamp, like adding and then removing some white space. just after loading the dynamic libraryStelModule* GpsLocatorStelPluginInterface::getStelModule() const{// return new GpsLocator(); return false;}StelPluginInfo GpsLocatorStelPluginInterface::getPluginInfo() const{ // Allow to load the resources when used as a static plugin// Q_INIT_RESOURCE(gpsLocatorRsc); StelPluginInfo info; info.id

I tested this by commenting out the GpsLocator class and its corresponding implementation in the CPP file. According to the information in the QT reference documentation, the QT_OBJECT macro is mandatory, but slots and signals are not. Why would breathing pure oxygen be a bad idea? After running qMake once more, life was good again. –Alex Hendren Nov 6 '13 at 7:32 | show 2 more comments up vote 17 down vote If you want to define

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. Go to the top of the page Skip user information Messenger Professional Posts: 1,289 Location: Lt 2 Monday, October 8th 2007, 7:52am RE: Error "undefined reference to `vtable" when Q_OBJECT is Mar 4, 2011 at 2:00pm UTC simeonz (490) http://bytes.com/topic/c/answers/161894-undefined-reference-vtable#post623578 (When I get errors that I don't understand, I google them and in 99% of the cases something useful shows up in How to tell where file is going to be saved?

include(qmlapplicationviewer/qmlapplicationviewer.pri) qtcAddDeployment() HEADERS += \ timecontrol.h \ scorecontrol.h \ Retry.h \ myapp.h \ myapplication.h OTHER_FILES += \ qtc_packaging/debian_fremantle/rules \ qtc_packaging/debian_fremantle/README \ qtc_packaging/debian_fremantle/copyright \ qtc_packaging/debian_fremantle/control \ qtc_packaging/debian_fremantle/compat \ qtc_packaging/debian_fremantle/changelog compat \ qtc_packaging/debian_fremantle/changelog c++ qt linker-error vtable share|improve this question asked Jan 23 '11 at 14:24 Donotalo 7,167145993 marked as duplicate by djf, Rubens, Phil Hannent, tjameson, John Doyle Jul 13 '13 at 19:03 See my answer for details. –Troubadour Jan 23 '11 at 15:49 "Add QT += gui in your pro file" this just save me. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

Browse other questions tagged c++ qt linker-error vtable or ask your own question. Why do neural network researchers care about epochs? If those answers do not fully address your question, please ask a new question. Search: Forum General C++ Programming Qt undefined reference to vtable Qt undefined reference to vtable Mar 4, 2011 at 12:53pm UTC fafner (377) I'm writing a simple, simple Qt app,

The main cause due to GCC is described here: http://gcc.gnu.org/faq.html#vtables But with QObject it gets a bit more complex. Just run qmake and you should be good to go assuming there are no other issues in your code. Apparently you can enforce this by adding “#include cpp_file_name.moc” to your “cpp_file_name.cpp” file. Rearrange colors in BarChart Unix Exit Command Does the Many Worlds interpretation of quantum mechanics necessarily imply every world exist?

The simple solution is to run the meta object compiler(moc) provided by Qt. The Q_OBJECT macro must appear inside the class definition of each QObject derived header file so that moc knows to generate code for it. Lets make some things clear: the Q_OBJECT macro is only needed (and moc'ing), if you are using signals and slots. No new replies allowed.

The Message is a complex struct, but even using int instead did not fix things. Signals and Slots (Section 8.5) MetaObjects, MetaProperties, MetaMethods (Chapter 12) qobject_cast (Section 12.2) Some of these features are only possible through the use of generated code. For more information about this error message, see Section C.3.1 [67] confusing + obfuscated Generated: 2012-03-02 © 2012 Alan Ezust and Paul Ezust.   8.3.  QApplication and the Event Loop   8.5.  Signals and The time now is 01:22.

The moc creates the code for the functions defined by Q_OBJECT and everything works fine. btw. When I click the button, it shows an error at the konsole that Object::connect: No such slot QDialog::findfactorial() What could be the problem ?? I can't say why, but it's the first thing I do when I encounter this kind of error.

Occasionally stops writing code and starts writing words when the Internet is down. By prasanth.nvs in forum Qt for Embedded and Mobile Replies: 3 Last Post: 20th February 2009, 10:19 Undefined reference to 'vtable for XXX' By Sheng in forum Qt Programming Replies: 4 Any ideas? A Riddle - Mountains and Valleys Can I use my client's GPL software?

It's only the most common way of doing it. Thus, you need to have moc process your header to generate a new .cpp file, and then include the .cpp file in your compilation. How do I find out if there is an Esperanto club in my city? "There is no well-ordered uncountable set of real numbers" Where's the 0xBEEF? Thanks;) I'll experiment a bit more with it.

Reply With Quote 11th January 2011,17:28 #2 vpicaver View Profile View Forum Posts View Blog Entries View Articles Beginner Join Date Nov 2008 Posts 2 Qt products Platforms Re: QOBJECT and class StelModule : public QObject { // Do not add Q_OBJECT here!! // This make this class compiled by the Qt moc compiler and for some unknown reasons makes it impossible The make clean isn't always necessary, but is when certain structural changes are made. –Kaleb Pederson Mar 31 '10 at 19:44 4 Also make sure that barelysocket.h is in HEADERS Over 90 percent of questions asked here gets answered.

To use all features of this page, you should consider registering. qmake then doesn't believe it needs to run moc and you end up with vtable errors.