C++QT实现压缩文件、文件夹和解压缩操作
一、前言
QZipWriter是用来压缩文件的类，需要在安装Qt是选择Sources源码安装。否则，无法使用QZipWriter。
1. QZipWriter函数说明
1.1 构造方法：
QZipWriter(const QString &fileName, QIODevice::OpenMode mode = (QIODevice::WriteOnly | QIODevice::Truncate) );
QZipWriter(QIODevice *device);fileName：保存zip文件的地址。
QIODevice 是 QFile 的父类，因此在构造 QZipWriter类的对象时，可以传递一个 QFile 类的对象。
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1.2 设置压缩权限：
enum CompressionPolicy {
AlwaysCompress,
NeverCompress,
AutoCompress
};
void setCompressionPolicy(CompressionPolicy policy);
CompressionPolicy compressionPolicy() const;
1.3 添加文件：
void addFile(const QString &fileName, const QByteArray &data);
1.4 添加目录：
void addDirectory(const QString &dirName);
如果需要将文件压缩到lib目录下，那么可以这样操作：
writer->addDirectory("lib");
writer->addFile("lib/" + fileName, const QByteArray &data);这样压缩，就可以在压缩包当中看到lib目录，并且文件在lib目录下。
二、实现方式
通过Qt自带的库来实现，使用多线程方式，通过信号和槽来触发压缩与解压缩，并将压缩和解压缩结果回传过来。
使用的类：
#include "QtGui/private/qzipreader_p.h"
#include "QtGui/private/qzipwriter_p.h"三、具体步骤
1、在.pro文件中添加模块gui-private
QT += core gui gui-private2、通过QObject方式创建多线程实现压缩与解压缩类
CompreDecompreFileThread.h
#ifndef COMPREDECOMPREFILETHREAD_H
#define COMPREDECOMPREFILETHREAD_H
#include
#include "QtGui/private/qzipreader_p.h"
#include "QtGui/private/qzipwriter_p.h"
#include
#include
#include
#include
class CompreDecompreFileThread : public QObject
{
Q_OBJECT
public:
typedef enum
{
success,
failed,
running
}ResultE;
signals:
void compression_res_signal(ResultE res,quint8 progress,QString remarks = nullptr);
void decompression_res_signal(ResultE res,quint8 progress,QString remarks = nullptr);
public slots:
/*
* 压缩文件
*/
void compression_file_run(QString srcPath,QString destPath);
/*
* 解压文件
*/
void decompression_file_run(QString srcPath,QString destPath);
public:
explicit CompreDecompreFileThread(QObject *parent = nullptr);
private:
/*
* 遍历压缩文件
*/
QFileInfoList ergodic_compression_file(QZipWriter *writer,QString rootPath,QString filePath);
private:
QZipWriter *zipWriter = nullptr;
QZipReader *zipReader = nullptr;
};
#endif // COMPREDECOMPREFILETHREAD_H CompreDecompreFileThread.cpp
#include "compredecomprefilethread.h"
#include
#include
CompreDecompreFileThread::CompreDecompreFileThread(QObject *parent)
: QObject{parent}
{
qRegisterMetaType("ResultE");
}
QFileInfoList CompreDecompreFileThread::ergodic_compression_file(QZipWriter *writer, QString rootPath, QString filePath)
{
QDir dir(filePath); //遍历各级子目录
QDir fileDir(filePath); //遍历子目录中所有文件
//先遍历文件夹 添加进widget
QFileInfoList fileList=dir.entryInfoList(QDir::Files | QDir::Hidden | QDir::NoSymLinks);
QFileInfoList folderList = dir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot); //获取当前所有目录 QDir::Dirs 0x001 列出目录；
for(int i = 0; i != folderList.size(); i++) //自动递归添加各目录到上一级目录
{
QString namepath = folderList.at(i).absoluteFilePath(); //获取路径
QFileInfo folderinfo= folderList.at(i);
QString name=folderinfo.fileName(); //获取目录名
QStringList list = folderinfo.absoluteFilePath().split(rootPath);
//qDebug()<<"Dir:"<addDirectory(folderinfo.absoluteFilePath().remove(list.at(0)));
QFileInfoList child_file_list = ergodic_compression_file(writer,rootPath,namepath); //进行递归 递归这个文件夹
fileList.append(child_file_list);
// file_list.append(name);
}
/*添加path路径文件*/
fileDir.setFilter(QDir::Files | QDir::Hidden | QDir::NoSymLinks); //获取当前所有文件
fileDir.setSorting(QDir::Name);
QFileInfoList _fileList = fileDir.entryInfoList();
for (int i = 0; i < _fileList.size(); ++i) //将当前目录中所有文件添加到treewidget中
{
QFileInfo fileInfo = _fileList.at(i);
QFile file(fileInfo.absoluteFilePath());
if(file.open(QIODevice::ReadOnly))
{
QStringList list = fileInfo.absoluteFilePath().split(rootPath);
//qDebug()<<"File:"<addFile(fileInfo.absoluteFilePath().remove(list.at(0)),file.readAll());
file.close();
}
}
return fileList;
}
void CompreDecompreFileThread::compression_file_run(QString srcPath, QString destPath)
{
qDebug()<zipWriter = new QZipWriter(saveFileName);
QFile file(srcPath);
if(!file.open(QIODevice::ReadOnly))
{
emit compression_res_signal(ResultE::failed,100,tr("文件打开失败！"));
return;
}
emit compression_res_signal(ResultE::running,50,tr("正在压缩中..."));
this->zipWriter->addFile(file.fileName(),file.readAll());
this->zipWriter->close();
delete this->zipWriter;
this->zipWriter = nullptr;
emit compression_res_signal(ResultE::running,100,tr("正在压缩中..."));
emit compression_res_signal(ResultE::success,100,tr("压缩完成！"));
}
else //压缩的是一个文件夹
{
QString folderStr = srcPath.mid(srcPath.lastIndexOf("/")).remove("/");
if(folderStr == nullptr)
{
emit compression_res_signal(ResultE::failed,100,tr("压缩文件路径错误！"));
return;
}
emit compression_res_signal(ResultE::running,50,tr("正在压缩中..."));
QString saveFileName = destPath+"/"+folderStr+".7z";
qDebug()<<"saveFileName:"<zipWriter = new QZipWriter(saveFileName);
this->zipWriter->addDirectory(folderStr);
this->ergodic_compression_file(this->zipWriter,folderStr,srcPath);
delete this->zipWriter;
this->zipWriter = nullptr;
emit compression_res_signal(ResultE::running,100,tr("正在压缩中..."));
emit compression_res_signal(ResultE::success,100,tr("压缩完成！"));
}
}
void CompreDecompreFileThread::decompression_file_run(QString srcPathAndName, QString destPath)
{
qDebug()<zipReader = new QZipReader(srcPathAndName);
bool res = this->zipReader->extractAll(destPath);
emit decompression_res_signal(ResultE::running,100,tr("正在解压缩..."));
if(res) //解压缩成功
{
emit decompression_res_signal(ResultE::success,100,tr("解压缩完成！"));
}
else
{
emit decompression_res_signal(ResultE::failed,100,tr("解压缩失败！"));
}
this->zipReader->close();
delete this->zipReader;
this->zipReader = nullptr;
} mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include
#include "QtGui/private/qzipreader_p.h"
#include "QtGui/private/qzipwriter_p.h"
#include
#include
#include
#include "compredecomprefilethread.h"
#include
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
signals:
void compress_signal(QString srcPath,QString destPath);
void decompress_signal(QString srcPath,QString destPath);
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_btnZip_clicked();
void on_btnUnZip_clicked();
void compress_res_slot(CompreDecompreFileThread::ResultE res,quint8 progress,QString remarks = nullptr);
void decompress_res_slot(CompreDecompreFileThread::ResultE res,quint8 progress,QString remarks = nullptr);
private:
Ui::MainWindow *ui;
CompreDecompreFileThread *compreDecompreFileThread;
QThread *compreDecompreFileMainThread;
};
#endif // MAINWINDOW_H mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
compreDecompreFileThread = new CompreDecompreFileThread;
compreDecompreFileMainThread = new QThread;
compreDecompreFileThread->moveToThread(compreDecompreFileMainThread);
compreDecompreFileMainThread->start();
connect(this,&MainWindow::compress_signal,compreDecompreFileThread,&CompreDecompreFileThread::compression_file_run);
connect(this,&MainWindow::decompress_signal,compreDecompreFileThread,&CompreDecompreFileThread::decompression_file_run);
connect(compreDecompreFileThread,&CompreDecompreFileThread::compression_res_signal,this,&MainWindow::compress_res_slot);
connect(compreDecompreFileThread,&CompreDecompreFileThread::decompression_res_signal,this,&MainWindow::decompress_res_slot);
qDebug()< mainwindow.ui
本文福利，莬费领取Qt开发学习资料包、技术视频，内容包括（C++语言基础，Qt编程入门，QT信号与槽机制，QT界面开发-图像绘制，QT网络，QT数据库编程，QT项目实战，QT嵌入式开发，Quick模块等等）↓↓↓↓↓↓见下面↓↓文章底部点击莬费领取↓↓