Open a dialog box to select multiple folders for operation

qt_test.h 

#pragma once

#include <QWidget>
#include <QList>
#include <QString>
#include <QFileDialog>
#include <QPushButton>

class qt_test : public QWidget
{
	Q_OBJECT
public:
	qt_test(QWidget *parent = Q_NULLPTR);
        void UpLoadFileInfoToServer(const QList<QString> &dir_list);

public slots :
        void SlotFileUpload();

private:
	QList<QString>                 dirlists;
        QPushButton                    *upLoadBt;
        myFileSelect                   *mFileSelect;
};


class myFileSelect :public QFileDialog
{
	Q_OBJECT
public:
	explicit myFileSelect(QWidget *parent = 0);

signals:

public slots :
	void go();
};

qt_test.cpp

#include "qt_test.h"
#include <QFileSystemModel>
#include <QTreeWidget>
#include <QDebug>
#include <QListView>
#include <QDialogButtonBox>

myFileSelect::myFileSelect(QWidget *parent) :
QFileDialog(parent)
{
}

void  myFileSelect::go()
{
	QDialog::accept();
}

qt_test::qt_test(QWidget *parent)
	: QWidget(parent)
{
        mFileSelect= new myFileSelect();
        connect(upLoadBt,SIGNAL(clicked()),this,SLOT(SlotFileUpload()));
}

void qt_test::SlotFileUpload()
{
        QList<QString> dirlists;
        mFileSelect->setOption(QFileDialog::DontUseNativeDialog, true);

        QListView *listView = mFileSelect->findChild<QListView*>("listView");
        if (listView)
	    listView->setSelectionMode(QAbstractItemView::ExtendedSelection);
        QTreeView *treeView = mFileSelect->findChild<QTreeView*>();
        if (treeView)
	    treeView->setSelectionMode(QAbstractItemView::ExtendedSelection);
        QDialogButtonBox *button = mFileSelect->findChild<QDialogButtonBox *>("buttonBox");

        disconnect(button, SIGNAL(accepted()), mFileSelect, SLOT(accept()));            
        connect(button, SIGNAL(accepted()), mFileSelect, SLOT(go()));                   

        if (mFileSelect->exec() == QDialog::Accepted)                 //这一行不能省略，不然不弹对话框
        {
	    dirlists = mFileSelect->selectedFiles();	              //以QList<QString> dirlists 类型输出
            UpLoadFileInfoToServer(dirlists);
        }
}

void qt_test::UpLoadFileInfoToServer(const QList<QString> &dir_list)
{
    for (int i = 0; i < dir_list.size(); i++)
    {
        QDir dir(dir_list.at(i));
        QFileInfoList infolist = dir .entryInfoList(QDir::Files | QDir::Readable);

        //进行下面的操作
        ...
    }
}