Qt Qobject Error Undefined Reference To Vtable For
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Undefined Reference To Vtable For Class Qt
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Undefined Reference To Vtable For Class Qobject
is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Qt Linker Error: “undefined reference to vtable” up vote 32 down vote favorite 8 This is my header: #ifndef BARELYSOCKET_H #define BARELYSOCKET_H #include
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Undefined Reference To Signal Qt
answers to any questions you might have Meta Discuss the undefined reference to metaobject const workings and policies of this site About Us Learn more about Stack Overflow the company the vtable symbol may be undefined because the class is missing its key function Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join http://stackoverflow.com/questions/2555816/qt-linker-error-undefined-reference-to-vtable the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Qt undefined reference to vtable [duplicate] up vote 13 down vote favorite 2 This question already has an answer here: Qt Linker http://stackoverflow.com/questions/14010922/qt-undefined-reference-to-vtable Error: “undefined reference to vtable” 8 answers I am a beginner to Qt programming and use codeblocks for my programming. I created 3 files communicate.h,commmunicate.cpp and main.cpp as follows: communicate.h #ifndef COMMUNICATE_H #define COMMUNICATE_H #include
vtable errors If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have http://www.qtcentre.org/threads/37731-QOBJECT-and-undefined-reference-to-vtable-errors to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Welcome https://www.ics.com/designpatterns/book/moc.html to Qt Centre. Qt Centre is a community site devoted to programming in C++ using the Qt framework. Over 90 percent of questions asked here gets answered. If you are undefined reference looking for information about Qt related issue — register and post your question. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and undefined reference to access many other special features. Registration is fast, simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact us. + Reply to Thread Results 1 to 8 of 8 Thread: QOBJECT and undefined reference to vtable errors Thread Tools Show Printable Version Subscribe to this Thread… Search Thread Advanced Search Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 11th January 2011,16:53 #1 stargazer View Profile View Forum Posts View Blog Entries View Articles Beginner Join Date Jan 2011 Posts 3 Qt products Platforms QOBJECT and undefined reference to vtable errors I've been working on a plugin to an third party application an have recently introduced a GUI dialogue module into the project. The problem is that I can't get around an error I am getting which is: undefined reference to 'vtable for StelModule' I have reduced my code down to the basics and have discovered that when I remove Q_OBJECT from the class definition within the hpp file the ev
] QObject supports features not normally available in C++ objects. 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. The Meta Object Compiler, moc, generates additional functions for each QObject-derived class that uses the Q_OBJECT macro. Generated code can be found in files with names moc_filename.cpp. This means that some errors from the compiler/linker may be confuscated[67] when moc cannot find or process a class in the project. To help ensure that moc processes each QObject-derived class in the project, following are some guidelines for writing C++ code and qmake project files. Each class definition should go in its own .h file. Its implementation should go in a corresponding .cpp file. The header file should be "wrapped" (e.g., with #ifndef) to avoid multiple inclusion. Each .cpp file should be listed in the SOURCES variable of the project file; otherwise it will not be compiled. Each header file should be listed in the HEADERS variable of the .pro file. Without this, moc will not preprocess the file. 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. Multiple Inheritance and QObject Because each Q_OBJECT macro generates code, it needs to be preprocessed by moc. moc works under the assumption that you are only deriving from QObject once and, further, that QObject is the first base class in the list of base classes. If you accidentally inherit from QObject more than once, or if it is not the first base class in the inheritance list, you may produce strange errors in the moc-generated code. Undefined reference to vtable If you define a QOb