zip - Zipping a folder/file using Qt

Question

I would like to know if there is any class in Qt which can zip a folder or file. I used QProcess to compress, it got compressed but I am unable to uncompress it using a normal zip tool. Can anyone let me know how can we compress a folder/file using Qt api classes?

Answer 1

A few years ago I had such a issue, and here is my solution:

1). get QuaZip (here is the link text)

2). include quazip sources to your project file

Headers:

HEADERS += src/quazip/crypt.h 
           src/quazip/ioapi.h 
           src/quazip/quazip.h 
           src/quazip/quazipfile.h 
           src/quazip/quazipfileinfo.h 
           src/quazip/quazipnewinfo.h 
           src/quazip/unzip.h 
           src/quazip/zip.h 
           ...

Sources:

SOURCES += src/quazip/ioapi.c 
           src/quazip/quazip.cpp 
           src/quazip/quazipfile.cpp 
           src/quazip/quazipnewinfo.cpp 
           src/quazip/unzip.c 
           src/quazip/zip.c
           ...

3). add headers

#include "quazip/quazip.h"
#include "quazip/quazipfile.h"

4). use extract function:

static bool extract(const QString & filePath, const QString & extDirPath, const QString & singleFileName = QString("")) {

QuaZip zip(filePath);

if (!zip.open(QuaZip::mdUnzip)) {
    qWarning("testRead(): zip.open(): %d", zip.getZipError());
    return false;
}

zip.setFileNameCodec("IBM866");

qWarning("%d entries
", zip.getEntriesCount());
qWarning("Global comment: %s
", zip.getComment().toLocal8Bit().constData());

QuaZipFileInfo info;

QuaZipFile file(&zip);

QFile out;
QString name;
char c;
for (bool more = zip.goToFirstFile(); more; more = zip.goToNextFile()) {

    if (!zip.getCurrentFileInfo(&info)) {
        qWarning("testRead(): getCurrentFileInfo(): %d
", zip.getZipError());
        return false;
    }

    if (!singleFileName.isEmpty())
        if (!info.name.contains(singleFileName))
            continue;

    if (!file.open(QIODevice::ReadOnly)) {
        qWarning("testRead(): file.open(): %d", file.getZipError());
        return false;
    }

    name = QString("%1/%2").arg(extDirPath).arg(file.getActualFileName());

    if (file.getZipError() != UNZ_OK) {
        qWarning("testRead(): file.getFileName(): %d", file.getZipError());
        return false;
    }

    //out.setFileName("out/" + name);
    out.setFileName(name);

    // this will fail if "name" contains subdirectories, but we don't mind that
    out.open(QIODevice::WriteOnly);
    // Slow like hell (on GNU/Linux at least), but it is not my fault.
    // Not ZIP/UNZIP package's fault either.
    // The slowest thing here is out.putChar(c).
    while (file.getChar(&c)) out.putChar(c);

    out.close();

    if (file.getZipError() != UNZ_OK) {
        qWarning("testRead(): file.getFileName(): %d", file.getZipError());
        return false;
    }

    if (!file.atEnd()) {
        qWarning("testRead(): read all but not EOF");
        return false;
    }

    file.close();

    if (file.getZipError() != UNZ_OK) {
        qWarning("testRead(): file.close(): %d", file.getZipError());
        return false;
    }
}

zip.close();

if (zip.getZipError() != UNZ_OK) {
    qWarning("testRead(): zip.close(): %d", zip.getZipError());
    return false;
}

return true;
}

and archive function:

static bool archive(const QString & filePath, const QDir & dir, const QString & comment = QString("")) {

QuaZip zip(filePath);
zip.setFileNameCodec("IBM866");

if (!zip.open(QuaZip::mdCreate)) {
    myMessageOutput(true, QtDebugMsg, QString("testCreate(): zip.open(): %1").arg(zip.getZipError()));
    return false;
}

if (!dir.exists()) {
    myMessageOutput(true, QtDebugMsg, QString("dir.exists(%1)=FALSE").arg(dir.absolutePath()));
    return false;
}

QFile inFile;

// Получаем список файлов и папок рекурсивно
QStringList sl;
recurseAddDir(dir, sl);

// Создаем массив состоящий из QFileInfo объектов
QFileInfoList files;
foreach (QString fn, sl) files << QFileInfo(fn);

QuaZipFile outFile(&zip);

char c;
foreach(QFileInfo fileInfo, files) {

    if (!fileInfo.isFile())
        continue;

    // Если файл в поддиректории, то добавляем имя этой поддиректории к именам файлов
    // например: fileInfo.filePath() = "D:WorkSourcesSAGOsvnsagoReleasemp_DOCSWINFolder123.opn"
    // тогда после удаления части строки fileNameWithSubFolders будет равен "Folder123.opn" и т.д.
    QString fileNameWithRelativePath = fileInfo.filePath().remove(0, dir.absolutePath().length() + 1);

    inFile.setFileName(fileInfo.filePath());

    if (!inFile.open(QIODevice::ReadOnly)) {
        myMessageOutput(true, QtDebugMsg, QString("testCreate(): inFile.open(): %1").arg(inFile.errorString().toLocal8Bit().constData()));
        return false;
    }

    if (!outFile.open(QIODevice::WriteOnly, QuaZipNewInfo(fileNameWithRelativePath, fileInfo.filePath()))) {
        myMessageOutput(true, QtDebugMsg, QString("testCreate(): outFile.open(): %1").arg(outFile.getZipError()));
        return false;
    }

    while (inFile.getChar(&c) && outFile.putChar(c));

    if (outFile.getZipError() != UNZ_OK) {
        myMessageOutput(true, QtDebugMsg, QString("testCreate(): outFile.putChar(): %1").arg(outFile.getZipError()));
        return false;
    }

    outFile.close();

    if (outFile.getZipError() != UNZ_OK) {
        myMessageOutput(true, QtDebugMsg, QString("testCreate(): outFile.close(): %1").arg(outFile.getZipError()));
        return false;
    }

    inFile.close();
}

// + комментарий
if (!comment.isEmpty())
    zip.setComment(comment);

zip.close();

if (zip.getZipError() != 0) {
    myMessageOutput(true, QtDebugMsg, QString("testCreate(): zip.close(): %1").arg(zip.getZipError()));
    return false;
}

return true;
}

5). enjoy ;)

UPDATE: for CapDroid.

/* Рекурсивно ищет все файлы в директории a и добавляет в список  */
static void recurseAddDir(QDir d, QStringList & list) {

    QStringList qsl = d.entryList(QDir::NoDotAndDotDot | QDir::Dirs | QDir::Files);

    foreach (QString file, qsl) {

        QFileInfo finfo(QString("%1/%2").arg(d.path()).arg(file));

        if (finfo.isSymLink())

            return;

        if (finfo.isDir()) {

            QString dirname = finfo.fileName();
            QDir sd(finfo.filePath());

            recurseAddDir(sd, list);

        } else
            list << QDir::toNativeSeparators(finfo.filePath());
    }
}