Using Qt libraries on VS

Question

I am trying to build a C++ project on VS. The project was developed using NetBeans in a Linux machine and now I am using Visual Studio 2017 on Windows.

It wasn't developed using Qt Creatos so the libraries has been added manually with sentences like:

#include <QtCore>
#include <QCoreApplication>
#include <QObject>
#include <QStringList>
#include <QMap>
...

This is what I did so far:

• Downloaded the last Qt release
• Unpacked everything in C:\Qt
• In VS properties > VC++ Directories > Include directories - I added C:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include and C:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore
• In VS properties > VC++ Directories > Library directories - I added C:\Qt\Qt5.9.2\5.9.2\msvc2017_64\lib

However, when I try to #include <QtCore> it seems like VS expects something more: https://imgur.com/a/ruSbi

but it doesn't compile.

Severity    Code    Description Project File    Line    Suppression State
Error (active)  E0020   identifier "QEvent" is undefined        c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qabstractanimation.h 121 
Error (active)  E0020   identifier "QEvent" is undefined    c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qabstractstate.h 73  
Error (active)  E0020   identifier "QEvent" is undefined    c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qabstractstate.h 74  
Error (active)  E0020   identifier "QEvent" is undefined    c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qabstractstate.h 76  
Error (active)  E1455   member function declared with 'override' does not override a base class member      c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qabstracttransition.h    105 
Error (active)  E1455   member function declared with 'override' does not override a base class member  c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qanimationgroup.h    70  
Error (active)  E1455   member function declared with 'override' does not override a base class member  c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qcoreapplication.h   190 
Error (active)  E0020   identifier "qint8" is undefined c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qdatastream.h    147 
Error (active)  E0020   identifier "qint8" is undefined c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qdatastream.h    163 
Error (active)  E0260   explicit type is missing ('int' assumed)    c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qendian.h    236 
Error (active)  E0801   "qint8" is not a class or function template name in the current scope   c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qendian.h    236 
Error (active)  E0065   expected a ';'  c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qendian.h    236 
Error (active)  E0020   identifier "qint8" is undefined c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qendian.h    236 
Error (active)  E0020   identifier "QEvent" is undefined    c:\Qt\Qt5.9.2\5.9.2\msvc2017_64\include\QtCore\qeventloop.h 79  
Error (active)  E1455   member function declared with 'override' does not override a base class member
...     

So, I guess I'm missing something. I am new with VS, so I would appreciate any help.

Thank you

Answer 1

QtCore is both a directory and an include file:

Directory: <Qt_Install_Path>/include/QtCore
File:      <Qt_Install_Path>/include/QtCore/QtCore

Also you need to run the Qt moc on every header that contains the Q_OBJECT macro. The moc will generate extra C++ files, which you need to compile. It is fairly straightforward when using tools like qmake or cmake. For VS you might wan to use Qt Visual Studio Add-in.