Qt获取文件信息

头文件

#ifndef GETFILEINFO_H#define GETFILEINFO_H#include <QWidget>#include <QDragEnterEvent>#include <QDropEvent>namespace Ui {class GetFileInfo;}class GetFileInfo : public QWidget{    Q_OBJECTpublic:    explicit GetFileInfo(QWidget *parent = 0);    ~GetFileInfo();    void getFileInfo(QString &fileName);    qint64 du(QString path);    QString changeSizeFmt(qint64 size);protected:    void dragEnterEvent(QDragEnterEvent *event);    void dropEvent(QDropEvent *event);    void dragLeaveEvent(QDragLeaveEvent *event);private slots:    void on_btn_file_clicked();private:    Ui::GetFileInfo *ui;    QString m_fileName;     //文件名};#endif // GETFILEINFO_H

源文件

#include "getfileinfo.h"#include "ui_getfileinfo.h"#include <QDebug>#include <QMimeData>#include <QFileInfo>#include <QFileIconProvider>        //根据扩展名获取文件图标、类型#include <QFileDialog>#include <QDir>#include <QDateTime>GetFileInfo::GetFileInfo(QWidget *parent) :    QWidget(parent),    ui(new Ui::GetFileInfo){    ui->setupUi(this);    setAcceptDrops(true);   //接受拖拽    ui->groupBox->setEnabled(false);}GetFileInfo::~GetFileInfo(){    delete ui;}//获取文件信息void GetFileInfo::getFileInfo(QString &fileName){    QFileInfo info(fileName);    qint64 size;    if(info.isDir()){        size = du(fileName);    }else if(info.isFile()){        size = info.size();    }    QString strSize = changeSizeFmt(size);    ui->size_lineEdit->setText(strSize);    QString createTime = info.created().toString("yyyy/MM/dd hh:mm:ss ddd");    ui->create_lineEdit->setText(createTime);    QString modifyTime = info.lastModified().toString("yyyy/MM/dd hh:mm:ss ddd");    ui->modify_lineEdit->setText(modifyTime);    QString readTime = info.lastRead().toString("yyyy/MM/dd hh:mm:ss ddd");    ui->read_lineEdit->setText(readTime);    //根据扩展名获取文件图标、类型    QFileIconProvider provider;    QString fileType = provider.type(info);    ui->type_lineEdit->setText(fileType);    QIcon icon = provider.icon(info);    setWindowIcon(icon);    //设置属性    ui->dir_checkBox->setCheckState( info.isDir() ? Qt::Checked : Qt::Unchecked );    ui->file_checkBox->setCheckState( info.isFile() ? Qt::Checked : Qt::Unchecked );    ui->link_checkBox->setCheckState( info.isSymLink() ? Qt::Checked : Qt::Unchecked );    ui->hide_checkBox->setCheckState( info.isHidden() ? Qt::Checked : Qt::Unchecked );    ui->read_checkBox->setCheckState( info.isReadable() ? Qt::Checked : Qt::Unchecked );    ui->write_checkBox->setCheckState( info.isWritable() ? Qt::Checked : Qt::Unchecked );    ui->execute_checkBox->setCheckState( info.isExecutable() ? Qt::Checked : Qt::Unchecked );}//读取目录以及文件大小qint64 GetFileInfo::du(QString path){    QDir dir(path);    qint64 size = 0;    foreach (QFileInfo info, dir.entryInfoList(QDir::Files)) {        //计算文件大小        size += info.size();    }    foreach (QFileInfo subDir, dir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot)) {        //若存在子目录,则递归调用du函数        size += du(path + QDir::separator() + subDir.fileName());   //补全文件名路径    }    return size;}//改变数据大小显示格式QString GetFileInfo::changeSizeFmt(qint64 size){    double curSize = size;    QString unit = " B";    if(curSize > 1024){        curSize /= 1024;        unit = " KB";        if(curSize > 1024){            curSize /= 1024;            unit = " MB";            if(curSize > 1024){                curSize /= 1024;                unit = " GB";            }        }    }    QString textSize = QString::number(curSize, 'f', 2);    textSize.append(unit);    //分离字符串    QString tmpSize = QString::number(size);    int count = tmpSize.count();    for(int i = count - 3; i > 0; i -= 3){        tmpSize.insert(i, ",");    }    tmpSize.append(tr(" 字节"));    QString strSize;    strSize = textSize + " (" + tmpSize + ")";    return strSize;}void GetFileInfo::dragEnterEvent(QDragEnterEvent *event){    qDebug() << "DragEnter!";    //如果为文件，则支持拖放    if (event->mimeData()->hasFormat("text/uri-list"))        event->acceptProposedAction();}void GetFileInfo::dropEvent(QDropEvent *event){    qDebug() << "Drop!";    //注意：这里如果有多文件存在，意思是用户一下子拖动了多个文件，而不是拖动一个目录    //如果想读取整个目录，则在不同的操作平台下，自己编写函数实现读取整个目录文件名    QList<QUrl> urls = event->mimeData()->urls();    if(urls.isEmpty())        return;    //往文本框中追加文件名    foreach(QUrl url, urls) {        m_fileName = url.toLocalFile();        ui->file_lineEdit->setText(m_fileName);        getFileInfo(m_fileName);    }}void GetFileInfo::dragLeaveEvent(QDragLeaveEvent *event){    qDebug() << "Drag Leave";}void GetFileInfo::on_btn_file_clicked(){    QString path = QDir::homePath();    m_fileName = QFileDialog::getOpenFileName(this, tr("打开"), path, tr("All Files(*.*)"));    if(!m_fileName.isEmpty()){        ui->file_lineEdit->setText(m_fileName);        //获取文件信息        getFileInfo(m_fileName);    }}