QObject::connect (&mybutton, SIGNAL(clicked()), qApp, SLOT(updateMe())); @ the 3rd parameter should be the object of the slot you want to connect the signal to, so qApp is not correct here I think (qApp is a global pointer to your QApplication, which has no updateMe() slot), you have to use a pointer to your "learningbox" object. Qt: les Signaux et les slots d'Erreur: undefined reference Autres questions sur qt undefined-reference vtable signals-slots. licensed under cc by-sa 3.0 with attribution. WebDevDesigner.com qt - C++ - Undefined reference to `vtable (constructor 5 days ago · I constantly and actively use the technique of signals and slots in real multi-file programs, and I have never encountered such problems. Qt “signal undefined reference error” after inheriting from QObject. 1. qt - undefined reference to `vtable for myObj' in qt console application - signals and slots ...
... complaining about undefined references to names prefixed with gl then there is a ... Click the signal/slot button , then click the slider you'd to control the X axis ...
Hi, thank you already for investing time to help me finding a solution to my problem. I did research on the web and did not find any idea how to handle my errors. I do voluntary work for a youth organization and I try to help them out with making a progra... Qt: les Signaux et les slots d'Erreur: undefined reference ... Autres questions sur qt undefined-reference vtable signals-slots. licensed under cc by-sa 3.0 with attribution. WebDevDesigner.com ... [SOLVED] undefined reference to signal in resizeEvent ... [quote author="T3STY" date="1423993404"]Adding the Q_OBJECT macro simply creates undefined reference to `vtable for mwid' errors, so I guess it's not needed.[/quote]Yes, the Q_OBJECT macro is needed for every class that uses signals and slots. signals-slots reference - Qt ... - code-examples.net qt signals-slots vtable undefined-reference Qtリンカエラー： "vtableへの未定義参照" QSharedPointerとQSharedDataPointerの違いは？
Qt 4.3: Signals and Slots
Signals and Slots. In Qt, we have an alternative to the callback technique: We use signals and slots. A signal is emitted when a particular event occurs. Qt's widgets have many predefined signals, but we can always subclass widgets to add our own signals to them. A slot is a function that is called in response to a particular signal. c++ - qt - undefined reference to `vtable for myObj' in qt ... You have two options: @eyllanesc solution works for sure. add the line #include "main.moc" before or after you main() function.; When you put the class into its own header file, qmake will generate the proper moc file. But when you put the class into a .cpp file, the moc code is not generated unless you put the line I said before.. Update #1
Undefined reference to class::slot in Qt/C++ - Stack Overflow
Adding a Q_OBJECT macro to a class means it needs to go through the moc to generate the meta information for that class (the Task::staticMetaObject compiler complains about missing). The problem here is that by default moc is not run on cpp files, only on headers. The easiest way to fix your problem is to put the Task class in a proper header file, as it should be anyway.
Beginner problem: undefined reference, Use of signals/slots
Qt Signal Slot Undefined Reference - The signature of a Show that the slot has been called. The signals and slots mechanism is type safe: What qt signal slot undefined reference I am trying to do is to make a slot for axisDoubleClick signal.Have some fun coding poker room costa mesa ca events in C++! Beginner problem: undefined reference, Use of signals/slots Hi, thank you already for investing time to help me finding a solution to my problem. I did research on the web and did not find any idea how to handle my errors. I do voluntary work for a youth organization and I try to help them out with making a progra... undefined reference. to custom slot | Qt Forum QObject::connect (&mybutton, SIGNAL(clicked()), qApp, SLOT(updateMe())); @ the 3rd parameter should be the object of the slot you want to connect the signal to, so qApp is not correct here I think (qApp is a global pointer to your QApplication, which has no updateMe() slot), you have to use a pointer to your "learningbox" object.
Jan 5, 2006 ... Thread: Undefined reference to my signal .... (although I tend to implement signals and slots heavily(maybe too much so!), so 80% of my new ... qt - undefined reference to `vtable for myObj' in qt console ...