Problem with QDir::cdUp()

[nuntawat]

Hello everyone. Now I want to access the parent directory by using cdUp(). For example, when the current directory is C:\SampleRoot\SampleFolder and I'd like to access C:\SampleRoot:

QDir tmpCurrDir = QDir::current();
tmpCurrDir.cdUp();
QString rootDir = tmpCurrDir.currentPath();

QDir tmpCurrDir = QDir::current();
tmpCurrDir.cdUp();
QString rootDir = tmpCurrDir.currentPath();

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Even if there is a existed directory and cdUp() always return true, but when calling the currentPath() it will give C:\SampleRoot\SampleFolder not C:\SampleRoot. So what should I do?

Thanks a lot for everyone!