windows下qt使用zlib压缩文件夹，解压缩

在Windows下使用Qt进行文件夹压缩和解压缩，可以使用zlib库进行实现。以下是实现的基本步骤：

1. 下载zlib库并将其添加到Qt项目中。

2. 使用zlib库的函数进行文件夹压缩，代码示例：

#include <zlib.h>

// 压缩文件夹
bool compressFolder(QString folderPath, QString zipFilePath) {
    QDir dir(folderPath);
    if (!dir.exists()) {
        qDebug() << "Folder not exists!";
        return false;
    }

    QFile zipFile(zipFilePath);
    if (!zipFile.open(QIODevice::WriteOnly)) {
        qDebug() << "Failed to create zip file!";
        return false;
    }

    // 初始化zlib stream
    z_stream stream;
    stream.zalloc = Z_NULL;
    stream.zfree = Z_NULL;
    stream.opaque = Z_NULL;

    deflateInit(&stream, Z_DEFAULT_COMPRESSION);

    // 遍历文件夹下所有文件进行压缩
    QList<QFileInfo> fileInfoList = dir.entryInfoList(QDir::Files | QDir::Dirs | QDir::NoDotAndDotDot);
    foreach (QFileInfo fileInfo, fileInfoList) {
        if (fileInfo.isDir()) {
            QString subFolderPath = fileInfo.filePath();
            QString subZipFilePath = zipFilePath + "/" + fileInfo.fileName() + ".zip";
            compressFolder(subFolderPath, subZipFilePath);
        } else {
            QFile file(fileInfo.filePath());
            if (!file.open(QIODevice::ReadOnly)) {
                qDebug() << "Failed to open file: " << fileInfo.filePath();
                continue;
            }

            QByteArray data = file.readAll();
            QByteArray compressedData(data.size(), Qt::Uninitialized);

            stream.avail_in = data.size();
            stream.next_in = (Bytef *)data.data();
            stream.avail_out = compressedData.size();
            stream.next_out = (Bytef *)compressedData.data();

            deflate(&stream, Z_FINISH);
            compressedData.resize(stream.total_out);

            zipFile.write(compressedData);
        }
    }

    // 完成压缩
    deflateEnd(&stream);
    zipFile.close();

    return true;
}

3. 使用zlib库的函数进行文件夹解压缩，代码示例：

#include <zlib.h>

// 解压文件夹
bool decompressFolder(QString zipFilePath, QString folderPath) {
    QFile zipFile(zipFilePath);
    if (!zipFile.open(QIODevice::ReadOnly)) {
        qDebug() << "Failed to open zip file!";
        return false;
    }

    QDir dir(folderPath);
    if (!dir.exists()) {
        dir.mkpath(".");
    }

    // 初始化zlib stream
    z_stream stream;
    stream.zalloc = Z_NULL;
    stream.zfree = Z_NULL;
    stream.opaque = Z_NULL;

    inflateInit(&stream);

    // 逐个解压文件
    QByteArray buffer(1024 * 1024, Qt::Uninitialized);
    while (!zipFile.atEnd()) {
        QByteArray compressedData = zipFile.read(buffer.size());
        buffer.resize(compressedData.size() * 2);

        stream.avail_in = compressedData.size();
        stream.next_in = (Bytef *)compressedData.data();
        stream.avail_out = buffer.size();
        stream.next_out = (Bytef *)buffer.data();

        int result = inflate(&stream, Z_SYNC_FLUSH);
        if (result != Z_OK && result != Z_STREAM_END) {
            qDebug() << "Failed to decompress data!";
            inflateEnd(&stream);
            return false;
        }

        buffer.resize(buffer.size() - stream.avail_out);

        QString fileName = QFileInfo(zipFilePath).baseName();
        QFile file(folderPath + "/" + fileName);
        if (!file.open(QIODevice::WriteOnly | QIODevice::Append)) {
            qDebug() << "Failed to create file: " << folderPath + "/" + fileName;
            continue;
        }

        file.write(buffer);
        file.close();
    }

    // 完成解压缩
    inflateEnd(&stream);
    zipFile.close();

    return true;
}

这样，就可以使用zlib库进行文件夹压缩和解压缩了。