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 1024

QFileInfoList 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);
	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;
}

待验证：
1、中文路径，文件名含有中文
2、隐藏文件夹，.dir和…dir，例如：.vs

待完善：
1、保存路径不存在，直接创建
2、单个超大文件的支持（1G以上）
3、当前操作文件回调
4、进度回调

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