qmlviewer is used for testing QML application code. The viewer prints out warnings about incorrect usage of QML to a command line terminal on Linux, to a separate window on Windows and to file e:\qml.log on Symbian, though there are plans to provide a warning window for qmlviewer on Symbian (QTBUG-10800). These warnings are used by both developers and non-technical designers when developing QML-based applications. If QML code is correct, no warnings should be printed. Unfortunately at least on Symbian^3 devices, every time qmlviewer is run, Symbian QCursor implementation prints out warning "qt_s60_setWindowGroupCursor - null handle".

qt_s60_setWindowGroupCursor - null handle
qt_s60_setWindowGroupCursor - null handle
qt_s60_setWindowGroupCursor - null handle
qt_s60_setWindowGroupCursor - null handle
qt_s60_setWindowGroupCursor - null handle

If you run qmlviewer ten times, you end up with 10 lines of warning in qml.log file. The warning has no use for QML developers. While the issue is minor, it masks real problems in the warning traces, and should be fixed.

The culprit in question is line 482 in File \src\gui\kernel\qcursor_s60.cpp

qWarning("qt_s60_setWindowGroupCursor - null handle");