how to delete a file

[athulms]

how can i delete a file i used the code

dir=new QDir(dir->currentPath());
    QFile file3(dir->filePath("Time.xml"));
    file3.remove();

dir=new QDir(dir->currentPath());
    QFile file3(dir->filePath("Time.xml"));
    file3.remove();

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but it doesnot works and returns false.