Qt4 QSettings save enumeration value (for example Qt::CheckState)
i wanna save state of QCheckBok in QSetting, i can cast its value to int but maybe exists more simple and proper method to do it?
here is my code:
QSetting setting;
Qt::CheckState checkState;
//...
checkState = (Qt::CheckSta开发者_运维百科te)setting.value("checkState", Qt::Unchecked).toUInt();
//...
setting.setValue("checkState", (uint)checkState);
setting.sync();
Firstly, try to avoid C-style casts. For example, replace the following line:
checkState = (Qt::CheckState)setting.value("checkState", Qt::Unchecked).toUInt();
with this:
checkState = static_cast<Qt::CheckState>(setting.value("checkState", Qt::Unchecked).toUint());
The line where you cast checkState
to a uint
should also be changed.
Secondly, QSettings relies on QVariant for setting and retrieving values. QVariant can usually be expanded to support additional types using the Q_DECLARE_METATYPE macro. Here's the documentation:
http://doc.trolltech.com/4.6/qmetatype.html#Q_DECLARE_METATYPE
However, this mechanism does not appear to work properly with enumerations (when you call the value()
member function on QVariant). So what you have right now (minus the C-style casting) is fine.
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