Qt制作有进度条的拷贝文件夹和文件的小Demo

效果图：

核心代码：

#ifndef SFILECOPY_H
#define SFILECOPY_H

#include <QObject>
#include <QDir>

class SFileCopy : public QObject
{
    Q_OBJECT
public:
    explicit SFileCopy(QObject *parent = 0);
    ~SFileCopy();

    //拷贝文件：
    bool copyFileToPath(QString sourceDir ,QString toDir, bool coverFileIfExist);

    //拷贝文件夹：
    bool copyDirectoryFiles(const QString &fromDir, const QString &toDir, bool coverFileIfExist);
signals:
    void sigCopyDirStation(float num);
    void sigCopyDirOver();
private:
    QDir * m_createfile = Q_NULLPTR;
    float m_total = 0;
    float m_value = 0;
    bool m_firstRead = true;
};

#endif // SFILECOPY_H

#include "sfilecopy.h"#include <QDir>#include <QFile>#include <QFileInfo>#include <QDebug>SFileCopy::SFileCopy(QObject *parent) : QObject(parent){    m_createfile = new QDir();}SFileCopy::~SFileCopy(){    if(m_createfile) {        m_createfile = Q_NULLPTR;        delete m_createfile;    }}bool SFileCopy::copyFileToPath(QString sourceDir, QString toDir, bool coverFileIfExist){    toDir.replace("\\","/");    if (sourceDir == toDir){        return true;    }    if (!QFile::exists(sourceDir)){        return false;    }    bool exist = m_createfile->exists(toDir);    if (exist){        if(coverFileIfExist){            m_createfile->remove(toDir);        }    }//end if    if(!QFile::copy(sourceDir, toDir)) {        return false;    }    return true;}bool SFileCopy::copyDirectoryFiles(const QString &fromDir, const QString &toDir, bool coverFileIfExist){    QDir sourceDir(fromDir);    QDir targetDir(toDir);    qDebug() << "copyDirectoryFiles:" << fromDir << toDir;    if(!targetDir.exists()){    /**< 如果目标目录不存在，则进行创建 */        if(!targetDir.mkdir(targetDir.absolutePath())) {            return false;        }    }    QFileInfoList fileInfoList = sourceDir.entryInfoList();    if(m_firstRead) {        int isfileTMP = 0;        qDebug() << "a copyDirectoryFiles:" << fileInfoList.count();        foreach(QFileInfo fileInfo, fileInfoList){            if(fileInfo.isFile()) {                isfileTMP++;            }        }        m_total = fileInfoList.count() - 2 - isfileTMP; // 2为.和..        m_value = 0;        m_firstRead = false;        qDebug() << "a copyDirectoryFiles:" << fileInfoList.count() <<m_total << isfileTMP;        emit sigCopyDirStation(m_value/m_total);        if(m_value == m_total) {            m_firstRead = true;            emit sigCopyDirStation(1);            emit sigCopyDirOver();        }    } else {        m_value++;        if(m_value == m_total) {            m_firstRead = true;            emit sigCopyDirOver();        }        qDebug() << "a copyDirectoryFiles:" << m_value <<m_total;        emit sigCopyDirStation(m_value/m_total);    }    foreach(QFileInfo fileInfo, fileInfoList){        if(fileInfo.fileName() == "." || fileInfo.fileName() == "..") {            continue;        }        if(fileInfo.isDir()){    /**< 当为目录时，递归的进行copy */            if(!copyDirectoryFiles(fileInfo.filePath(), targetDir.filePath(fileInfo.fileName()), coverFileIfExist)) {                return false;            }        } else{            /**< 当允许覆盖操作时，将旧文件进行删除操作 */            if(coverFileIfExist && targetDir.exists(fileInfo.fileName())){                targetDir.remove(fileInfo.fileName());            }            /// 进行文件copy            if(!QFile::copy(fileInfo.filePath(), targetDir.filePath(fileInfo.fileName()))){                return false;            }        }    }    return true;}

调用：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QDateTime>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    m_file = new SFileCopy(this);
    connect(m_file, &SFileCopy::sigCopyDirStation,[=](float num){
        ui->progressBar->setValue(100*num);
    });
    connect(m_file, &SFileCopy::sigCopyDirOver,[=](){
        ui->label->setText("Over");
    });
    m_fileDialog = new QFileDialog(this);
    m_fileDialog->setWindowTitle(tr("Open"));
    m_fileDialog->setDirectory(".");
    m_fileDialog->setFileMode(QFileDialog::DirectoryOnly);
    m_fileDialog->hide();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    ui->label->setText("");
    m_fileDialog->show();
    QStringList files;
    if(m_fileDialog->exec() == QDialog::Accepted) {
        files = m_fileDialog->selectedFiles();
    }
    QString fTMP = files.first();
    QString newTMP = fTMP + QDateTime::currentDateTime().toString("yyyy-MM-dd");
    m_file->copyDirectoryFiles(fTMP, newTMP , true);
}

注：

这个小Demo仅供参考~~