How to print variables with qDebug?

**ricardo** · 12th July 2009, 15:45

Thanks.

I tried that but it does not work. Should I include any header?

Qt Code:

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1>.\CUtil.cpp(60) : error C2678: binary '<<' : no operator found which takes a left-hand operand of type 'QDebug' (or there is no acceptable conversion)
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qchar.h(389): could be 'QDataStream &operator <<(QDataStream &,const QChar &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qbytearray.h(569): or 'QDataStream &operator <<(QDataStream &,const QByteArray &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qstring.h(1062): or 'QDataStream &operator <<(QDataStream &,const QString &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/kernel/qobject.h(471): or 'QDebug operator <<(QDebug,const QObject *)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/kernel/qcoreapplication.h(272): or 'QDebug operator <<(QDebug,const MSG &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(103): or 'QDataStream &operator <<(QDataStream &,const QPoint &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(181): or 'QDebug operator <<(QDebug,const QPoint &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(235): or 'QDataStream &operator <<(QDataStream &,const QPointF &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(354): or 'QDebug operator <<(QDebug,const QPointF &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(101): or 'QDataStream &operator <<(QDataStream &,const QSize &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(196): or 'QDebug operator <<(QDebug,const QSize &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(252): or 'QDataStream &operator <<(QDataStream &,const QSizeF &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(357): or 'QDebug operator <<(QDebug,const QSizeF &)'
1>        c:\qt\2009.02\qt\include\qtgui\../../src/gui/kernel/qcursor.h(151): or 'QDataStream &operator <<(QDataStream &,const QCursor &)'

1>.\CUtil.cpp(60) : error C2678: binary '<<' : no operator found which takes a left-hand operand of type 'QDebug' (or there is no acceptable conversion)
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qchar.h(389): could be 'QDataStream &operator <<(QDataStream &,const QChar &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qbytearray.h(569): or 'QDataStream &operator <<(QDataStream &,const QByteArray &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qstring.h(1062): or 'QDataStream &operator <<(QDataStream &,const QString &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/kernel/qobject.h(471): or 'QDebug operator <<(QDebug,const QObject *)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/kernel/qcoreapplication.h(272): or 'QDebug operator <<(QDebug,const MSG &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(103): or 'QDataStream &operator <<(QDataStream &,const QPoint &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(181): or 'QDebug operator <<(QDebug,const QPoint &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(235): or 'QDataStream &operator <<(QDataStream &,const QPointF &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qpoint.h(354): or 'QDebug operator <<(QDebug,const QPointF &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(101): or 'QDataStream &operator <<(QDataStream &,const QSize &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(196): or 'QDebug operator <<(QDebug,const QSize &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(252): or 'QDataStream &operator <<(QDataStream &,const QSizeF &)'
1>        c:\qt\2009.02\qt\include\qtcore\../../src/corelib/tools/qsize.h(357): or 'QDebug operator <<(QDebug,const QSizeF &)'
1>        c:\qt\2009.02\qt\include\qtgui\../../src/gui/kernel/qcursor.h(151): or 'QDataStream &operator <<(QDataStream &,const QCursor &)'

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