QDIr QFile Create failed???
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 /home/wangqinfeng/图片/qFile_qDir.png  
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 Partition is mounted read-only on UT, 
 you cannot write everywhere, there are default writeable directories though available with your app namespace by using
 QStandardPath api
 QStandardPaths::AppDataLocation -> ~./local/share/yourappnamespace
 QStandardPaths::CacheLocation -> ~.cache/yourappnamespacesee http://docs.ubports.com/en/latest/appdev/guides/writeable-dirs.html 
