Qt metaObject linker problem

Question

After integrating Qt with Vs and trying to compile .pro file I\'m getting following errors:

Error   9   error LNK2001: unresolved external symbol \"public         


        

Answer 1

You usally get these errors when the moc_foo.cpp for foo.h (which contains your class marked with Q_OBJECT) is not compiled / linked in your project.

To make a Qt project work in VS you either

1. Create a .vcproj file with 'qmake -tp vc' or
2. Use the Qt Visual Studio Add-in which handles all the moc magic automatically for you (doesn't work with VC Express versions though).

When using the add-in you can trigger the creation of the moc_foo.cpp by

• Make sure the header file of the object in question appears in the VS project
• List item
• remove all occurrances of Q_OBJECT from the header file of Multiplication_dialog.
• save the file
• add Q_OBJECT again
• save the file

Now you should have two versions of moc_multiplication_dialog.cpp in your "Generated Files" folder in the Solution Explorer. One for "Debug" and one for "Release". Make sure that one of these files is not excluded from build.