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QT implementation traverses folders

2022-07-19 11:57:00 【InfoQ】

Preface

You need to get local content in the project , According to logic , We need to open the folder , Find files in folders , And take out the contents of the file , But it's not necessarily easy to do it when you think of it . Next, we introduce how to traverse folders , Store the contents of the folder , Finally, the data in the file can be used on the project .

First step ： Get the directory of the folder , Take directory as parameter , Get all the file folders under the folder .

 QDir dir(dirPath);
 QFileInfoList fileInfoList = dir.entryInfoList(QDir::Files | QDir::NoDotAndDotDot | QDir::Dirs);

QDir::Files | QDir::NoDotAndDotDot | QDir::Dirs

These three parameters need to be written , If only write

QDir::NoDotAndDotDot

It may cause my opinion and the hiding of the folder to be unable to view .

QFileInfoList

It is used to obtain the basic information of all files or folders under the current folder

QDir::entryInfoList(Filters filters = NoFilter, SortFlags sort = NoSort)

This is a entryInfoList How to use and its parameters , And one of you“=” The parameter of is the default parameter , It can be filled or not filled in the process of use , According to your own needs .

entryInfoList

Its return type is

QFileInfoList

, Can be stored through him , Convenient for later operation .

The second step Get the file folder in the list

Traverse the list of files and folders just obtained , Enter the loop to determine whether it is a folder or a file ,

fileInfo.isDir()

Determine whether the current folder , If it is a folder, it will continue to enter the cycle , Until it is a file ！

fileInfo.isFile()

Determine whether it is currently a file , If it is a file, enter the internal operation file , Store the contents of the file in the corresponding location .

 
 foreach (auto fileInfo, fileInfoList) {
 if(fileInfo.isDir())
 {

 getFileListUnderDir(fileInfo.absoluteFilePath());
 }

 if(fileInfo.isFile())
 {
 // Store in a position relative to 
 }
 }

summary

Folder traversal is widely used , As long as it is for folder operation , Most of them need to traverse folders and find files to get content . Later, there are also many ways to use folders , Welcome to watch .

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