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-private

2、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widgetQFileInfoList 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_NAMESPACEclass 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()<