Use and partial explanation of QDIR class

Preface

qt  There are many files in , Avoid not i Read and operate the file , In my previous article, I introduced how to QT To delete folders （ There will be no inexplicable deletion of all ） And folder handling , Read data into the project . You can search keywords if you need .

The header file

#include < QDir >

QDir Class is mainly used to manipulate pathnames and all files and folders in other folders , But he can only get information about directory paths and files （ Be careful ： He can't get the information inside the document ！！ If you use the file type in xiuaode's words ）. This class is mainly used to read the directory of this file by using relative path or absolute path .

SortFlag

This function can be used to set the sorting problem of files , There is also another function for sorting , The usage is almost just this . The following will show some parameters related to it , Used to sort .

QDir::Name  Sort by name .QDir::Time  Sort by time （ Modification time ）.QDir::Size  Sort by file size .QDir::Unsorted  Don't order . Only one of the above four sorting methods can be set , He cannot coexist at the same time , It will cause confusion in sorting .  But there are also some for partial sorting , The awards are the sorting of folders and files separately .

QDir::DirsFirst  The first is the directory , Then there are files .QDir::Reversed  Reverse sort order .QDir::IgnoreCase  Sort case insensitive .QDir::DefaultSort-  Internal marking .

If you choose more than one of these methods   He will sort according to his internal order .

currentDirPath ()

  It is used to return to the current exe The absolute path of the existing current directory .

QDir::filePath

  What he returns is the path name of a file in the directory . But he will not check whether the file really exists in this directory

This time I just introduced the part I used , If you are interested, you can check all his summaries .