Cannot queue arguments of type 'QStringList'

With QT 4.1, I'm trying to connect a signal from a worker thread (child of QThread) to a slot in a class which is a child of QWidget and pass a QStringList as the argument:

Code:

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connect(m_workerThread, SIGNAL(setSystemUserNames(const QStringList&)),
			this, SLOT(setSystemUserNames(const QStringList&)));

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But when I run the program I get this error message and the connection isn't established:

Quote:

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QObject::connect: Cannot queue arguments of type 'QStringList'

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Both methods in m_workerThread and the GUI class are defined as:

Code:

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void setSystemUserNames(const QStringList& userNames);

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I've tried changing it to simply "QStringList userNames" (so, not const&), but still get the same warning. Am I missing something? Any idea?

Try:

Code:

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qRegisterMetaType<QStringList>("QStringList");

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or use QVariant holding a list (QVariant(QStringList)) instead of QStringList.