在Ubuntu上的Qt5应用程序中链接libqxt

Question

I have a problem with linking libqxt in a Qt5 application.

I write a code like in example in documentation but I have errors.

QxtGlobalShortcut* shortcut = new QxtGlobalShortcut(this);
connect(shortcut, SIGNAL(activated()), this, SLOT(newScreenshoot()));
shortcut->setShortcut(QKeySequence("Ctrl+Shift+F12"));

I'm using Qt 5.0.1 :

damian@damian-Lenovo-B560:~$ qmake --version
QMake version 3.0
Using Qt version 5.0.1 in /usr/lib/i386-linux-gnu

And latest libqxt-dev from Ubuntu 13.04 repository.

I have following linker errors:

/home/damian/Dokumenty/Programowanie/QShot/mainwindow.cpp:20: error: undefined reference to `QxtGlobalShortcut::QxtGlobalShortcut(QObject*)'
/home/damian/Dokumenty/Programowanie/QShot/mainwindow.cpp:22: error: undefined reference to `QxtGlobalShortcut::setShortcut(QKeySequence const&)'

Answer 1

I am now facing a similar problem on Ubuntu 13.10 and I have succeeded in compiling my application. The problem is a SIGSEGV I receive when adding the logger engine

QxtBasicFileLoggerEngine *dbg  = new QxtBasicFileLoggerEngine("debug.log");

// qxtLog takes ownership of dbg - no need to manage its memory
qxtLog->addLoggerEngine("dbg", dbg);

In order to do this I compiled everything with QT4 from command line (Don't use qmake, which uses by default qt5):

qmake-qt4 
make

So this seems to be indeed a weird combination of qt5 libs with qt4 libs (libqxt seems to be compiled with/for qt4). Unfortunately I don't have any other option that to use qt4 in order to compile the project on Ubuntu. I don't know if there's an issue raised at canonical.

Hope this saves some trouble and eliminates some frustration. I am surprised to see that almost nobody complains about this problem.