Enum signal parameter

I'm trying to use Qt's signals-and-slots mechanism with custom enumeration types. I have read all the following, and none of it helped: - http://doc.qt.digia.com/4.7-snapshot/qtbinding.html#using-enumerations-of-a-custom-type - Qt - no such signal error - Qt signal with an enum as a parameter DetectorEngineThread.h: ``` class DetectorEngineThread : public QThread { Q_OBJECT Q_ENUMS(ErrorCode) Q_ENUMS(Status) public: enum ErrorCode { ... }; enum Status { ... }; ... signals: void statusChanged(Status newStatus); void processingError(ErrorCode code); }; Q_DECLARE_METATYPE(DetectorEngineThread::ErrorCode) Q_DECLARE_METATYPE(DetectorEngineThread::Status) ``` MainWindow.h: ``` ... #include "DetectorEngineThread.h" ... class MainWindow : public QMainWindow { Q_OBJECT ... private: DetectorEngineThread* m_detEng; ... private slots: void on_detEng_statusChanged(DetectorEngineThread::Status newStatus); void on_detEng_processingError(DetectorEngineThread::ErrorCode errorCode); ... }; ``` MainWindow.cpp: ``` ... #include "MainWindow.h" ... MainWindow::MainWindow(...) : ... { ... qRegisterMetaType<DetectorEngineThread::Status>("DetectorEngineThread::Status"); qRegisterMetaType<DetectorEngineThread::ErrorCode>("DetectorEngineThread::ErrorCode"); ... m_detEng = new DetectorEngineThread(...); connect(m_detEng, SIGNAL(statusChanged(DetectorEngineThread::Status)), this, SLOT(on_detEng_statusChanged(DetectorEngineThread::Status)), Qt::QueuedConnection); connect(m_detEng, SIGNAL(processingError(DetectorEngineThread::ErrorCode)), this, SLOT(on_detEng_processingError(DetectorEngineThread::ErrorCode)), Qt::QueuedConnection); ... } ... void MainWindow::on_detEng_statusChanged(DetectorEngineThread::Status newStatus) { ... } void MainWindow::on_detEng_processingError(DetectorEngineThread::ErrorCode errorCode) { ... } ... ``` During runtime, I get the following messages (in the Application Output panel in Qt Creator): Object::connect: No such signal DetectorEngineThread::statusChanged(DetectorEngineThread::Status) in ... Object::connect: No such signal DetectorEngineThread::processingError(DetectorEngineThread::ErrorCode) in ... And obviously the slots' code never run, despite the fact that matching signals are emitted. I tried: - moving the enums into global scope, but the problem remained. - having the signals and the slots connected automatically via QMetaObject::connectSlotsByName, but that met with the same issue. - using the local names (e.g. Status instead of DetectorEngineThread::Status) in qRegisterMetaType and Q_DECLARE_METATYPE, and also tried to use these in the SIGNAL and SLOT macros.