Qt 实现压缩文件、文件夹和解压缩操作zip

一、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"

二、环境准备

1、在.pro文件中添加模块gui-private

QT       += core gui gui-private

若未cmake工程，需要在CMakeList.txt中添加

includeinclude_directories(${Qt5Gui_PRIVATE_INCLUDE_DIRS}))

三、实现示例

#include <QFileInfoList>
#include <QDir>
#include <QFileInfo>#define	FILE_MAX_SIZE 1024QFileInfoList ergodic_compression_file(QZipWriter *writer, const QString& rootPath, QString dirPath)
{QDir crrDir(dirPath);///解压失败的文件QFileInfoList errFileList;///添加文件QFileInfoList fileList = crrDir.entryInfoList(QDir::Files | QDir::Hidden | QDir::NoSymLinks);for (const QFileInfo& fileInfo : fileList){QString subFilePath = fileInfo.absoluteFilePath();QString zipWithinfilePath = subFilePath.mid(rootPath.size() + 1);QFile file(subFilePath);qint64 size = file.size() / 1024 / 1024;if (!file.open(QIODevice::ReadOnly) || size > FILE_MAX_SIZE){///打开文件失败，或者大于1GB导致无法解压的文件errFileList.append(fileInfo);continue;}writer->addFile(zipWithinfilePath, file.readAll());file.close();}///添加文件夹QFileInfoList folderList = crrDir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot);for (const QFileInfo& folderInfo : folderList){QString subDirPath = folderInfo.absoluteFilePath();QString zipWithinDirPath = subDirPath.mid(rootPath.size() + 1);writer->addDirectory(zipWithinDirPath);QFileInfoList child_file_list = ergodic_compression_file(writer, rootPath, subDirPath);errFileList.append(child_file_list);}return errFileList;
}bool compression_zip_file(const QString& selectFile2DirPath, const QString& savePath)
{if (selectFile2DirPath.isEmpty() || savePath.isEmpty()){return false;}if (!QFile::exists(selectFile2DirPath) || !QFileInfo(savePath).isDir()){return false;}if (QFileInfo(selectFile2DirPath).isFile())///压缩的是一个文件{QString fileName = QFileInfo(selectFile2DirPath).baseName();QString writerFilePath = savePath + "/" + fileName + ".zip";QFile selectFile(selectFile2DirPath);qint64 size = selectFile.size() / 1024 / 1024;if (!selectFile.open(QIODevice::ReadOnly) || size > FILE_MAX_SIZE){///打开文件失败，或者大于1GB导致无法压缩的文件return false;}QString addFileName = QFileInfo(selectFile2DirPath).fileName();QZipWriter writer(writerFilePath);writer.addFile(addFileName, selectFile.readAll());selectFile.close();return true;}else///压缩的是一个文件夹{QString zipRootFolder = selectFile2DirPath.mid(selectFile2DirPath.lastIndexOf("/") + 1);QString selectDirUpDir = selectFile2DirPath.left(selectFile2DirPath.lastIndexOf("/"));QString saveFilePath = savePath + "/" + zipRootFolder + ".zip";QZipWriter writer(saveFilePath);writer.addDirectory(zipRootFolder);QFileInfoList fileList = ergodic_compression_file(&writer, selectDirUpDir, selectFile2DirPath);writer.close();if (0 == fileList.size())return true;return false;}
}bool decompression_zip_file(const QString& selectZipFilePath, const QString& savePath)
{if (selectZipFilePath.isEmpty() || savePath.isEmpty()){return false;}if (!QFileInfo(selectZipFilePath).isFile() || !QFileInfo(savePath).isDir()){return false;}bool ret = true;QZipReader zipReader(selectZipFilePath);QVector<QZipReader::FileInfo> zipAllFiles = zipReader.fileInfoList();for (const QZipReader::FileInfo& zipFileInfo : zipAllFiles){const QString currDir2File = savePath + "/" + zipFileInfo.filePath;if (zipFileInfo.isSymLink){QString destination = QFile::decodeName(zipReader.fileData(zipFileInfo.filePath));if (destination.isEmpty()){ret = false;continue;}QFileInfo linkFi(currDir2File);if (!QFile::exists(linkFi.absolutePath()))QDir::root().mkpath(linkFi.absolutePath());if (!QFile::link(destination, currDir2File)){ret = false;continue;}}if (zipFileInfo.isDir){QDir(savePath).mkpath(currDir2File);}if (zipFileInfo.isFile){QByteArray dt = zipFileInfo.filePath.toUtf8();QString strtmp = QString::fromLocal8Bit(dt);QFile currFile(currDir2File);if (!currFile.isOpen()){currFile.open(QIODevice::WriteOnly);}else {ret = false;continue;}qint64 size = zipFileInfo.size / 1024 / 1024;if (size > FILE_MAX_SIZE){ret = false;continue;}QByteArray byteArr = zipReader.fileData(strtmp);currFile.write(byteArr);currFile.setPermissions(zipFileInfo.permissions);currFile.close();}}zipReader.close();return ret;
}