c ++ file / folder operations

Use qt, qt pro file needs to be added in some libraries, at the beginning will complain online to view, and then add the name of the library would be no problem. .
XXX.pro

QT -= gui

CONFIG += c++11 console
CONFIG -= app_bundle

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += main.cpp

INCLUDEPATH += /usr/include


LIBS += -L/usr/lib

LIBS += -lboost_system \
        -lboost_filesystem

main.cpp

#include "boost/filesystem.hpp"
#include <iostream>
#include <string>
//using namespace std;


int main(int argc, char *argv[])
{
    boost::filesystem::path path("/media/data_2/everyday/0902/test2");   //初始化
    boost::filesystem::path old_cpath = boost::filesystem::current_path(); //取得当前程序所在文件夹
    boost::filesystem::path parent_path = old_cpath.parent_path();//取old_cpath的上一层父文件夹路径
    boost::filesystem::path file_path = old_cpath / "file"; //path支持重载/运算符
    if(boost::filesystem::exists(file_path))  //推断文件存在性
    {
        std::string strPath = file_path.string();
        int x = 1;
    }
    else
    {
        //文件夹不存在;
        boost::filesystem::create_directory(file_path);  //文件夹不存在。创建
    }
    bool bIsDirectory = boost::filesystem::is_directory(file_path); //推断file_path是否为文件夹
    boost::filesystem::recursive_directory_iterator beg_iter(file_path);
    boost::filesystem::recursive_directory_iterator end_iter;
    for (; beg_iter != end_iter; ++beg_iter)
    {
        if (boost::filesystem::is_directory(*beg_iter))
        {
            continue;
        }
        else
        {
            std::string strPath = beg_iter->path().string();  //遍历出来的文件名称
            int x=1;
        }
    }
    boost::filesystem::path new_file_path = file_path / "test.txt";
    if(boost::filesystem::is_regular_file(new_file_path))   //推断是否为普通文件
    {
        int sizefile = boost::filesystem::file_size(new_file_path);  //文件大小(字节)
        int x =1;
    }
    boost::filesystem::remove(new_file_path);//删除文件new_file_path

    return 1;
}

I mainly used to determine whether a file exists, does not exist to create

#include "boost/filesystem.hpp"
#include <iostream>
#include <string>
//using namespace std;


int main(int argc, char *argv[])
{
    std::string file_path = "/media/data_2/everyday/0902/test1";
    if(boost::filesystem::exists(file_path))  //推断文件存在性
    {
        std::cout<<"file is exist"<<std::endl;
    }
    else
    {
        //文件夹不存在;
        boost::filesystem::create_directory(file_path);  //文件夹不存在。创建
    }
    return 1;
}