QT调用Linux文件系统

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前言：

　　QT提供了调用文件系统的方法，非必要情况下不要自己去写，直接用就好。
　　
　　

QFileSystemModel

The QFileSystemModel class provides a data model for the local filesystem.

This class provides access to the local filesystem, providing functions for renaming
and removing files and directories, and for creating new directories. In the simplest
case, it can be used with a suitable display widget as part of a browser or filter.

QFileSystemModel can be accessed using the standard interface provided by
QAbstractItemModel, but it also provides some convenience functions that
are specific to a directory model. The fileInfo(), isDir(), fileName() and filePath()
functions provide information about the underlying files and directories related to items
in the model. Directories can b