QVariant和qRegisterMetaType问题

Question

我有一个Pkg类,我需要在QVariant的形式下使用它.

在我的Pkg.h结束时,我有:

Q_DECLARE_METATYPE(Pkg)

这不会给出编译错误,但在我的main.cpp中我必须这样做:

qRegisterMetaType<Pkg>("Pkg");

这也不会给出错误,但是当我尝试创建一个QVariant(Pkg)时,我会遇到很多错误:

In member function 'void MainWindow::FillPackagesList()':  
mainWin.cpp:233: error: 'qRegisterMetaType' isnot a member of 'QMetaType' mainWin.cpp:234: error: no matching function for call to QVariant::QVariant(Pkg&)'                                             

/usr/lib/qt/include/QtCore/qvariant.h:208: note: QVariant::QVariant(Qt::GlobalColor)           
/usr/lib/qt/include/QtCore/qvariant.h:206: note: QVariant::QVariant(const QRegExp&)            
/usr/lib/qt/include/QtCore/qvariant.h:204: note: QVariant::QVariant(const QLocale&)            
/usr/lib/qt/include/QtCore/qvariant.h:203: note: QVariant::QVariant(const QUrl&)               
/usr/lib/qt/include/QtCore/qvariant.h:201: note: QVariant::QVariant(const QRectF&)             
/usr/lib/qt/include/QtCore/qvariant.h:200: note: QVariant::QVariant(const QRect&)          

和错误再次错误...

Answer 1

QVariant构造函数不会只采用任何旧类型.您需要使用QVariant :: setValue()或qVariantFromValue.