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I have QThread inherited class and when i add a Q_OBJECT macro, it gives unresolved external error. (I've included QObject and QThread).

class TCustomThread: public QThread { Q_OBJECT public: explicit TCustomThread(QObject *parent=0); public slots: void testSlot(); }

How can i solve this issue?

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  • 1
    Are you planning on re-writing how Qt manages threads? If not, and you're inheriting from QThread, you're doing it wrong: blog.qt.digia.com/blog/2010/06/17/youre-doing-it-wrong Commented Dec 4, 2013 at 16:07
  • If you're going to use QThread, you should read this: mayaposch.wordpress.com/2011/11/01/… Commented Dec 4, 2013 at 16:08
  • I've clean and rebuilt it but it doesn't works :( . It's too weird. Commented Dec 4, 2013 at 16:12
  • I've re-implemented QThread and overrided its "run()" method and it worked like a charm but when i add Q_OBJECT macro it gives me error Commented Dec 4, 2013 at 16:14
  • 1
    Are you using QtCreator? Clean and Rebuild do not run qmake again. Commented Dec 4, 2013 at 16:17

1 Answer 1

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In this case this error may accrue only if moc tool didn't create meta data for this class. This can happen in two cases:

  • file dependencies are broken so you have to run qmake and/or clean project (make clean).
  • moc tool is not instructed to generate those data, for example you are missing entry in pro file: HEADERS += tcustomthread.h

I'm assuming that you are using pro file, if you are using other build manager you have to just add missing entry respective to this HEADERS += tcustomthread.h.

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2 Comments

if you change the pro file you need to run qmake again
For others encountering this issue, this was caused when I created a new class (.h and .cpp files) outside my project directory and forgot to check "add to project" during creation.

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