for this example，from the Qt documentation , http://qt-project.org/doc/qt-4.8/network-download.html the program first read all data to the buffer ,then all data are written to the disk from the buffer ,right ?
then for this example，from the Qt documentation , http://qt-project.org/doc/qt-4.8/network-downloadmanager.html the program is reading and writing data all the time ,right ?
and which way is more proper ？
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