unpacking rar files

[mentalmushroom]

Hello. Does qt provide some means for unpacking rar files? Using command line tools isn't a good way, because I need it to be platform-independent and while unpacking I need to receive some information about the unrarring process such as progress indication, volume changing for multipart archives etc.

[squidge]

I know rarlabs produce Unrar.dll for Windows, maybe they produce similar library for Linux/etc?

[mentalmushroom]

Yes, unrar.dll is for windows and they also provide portable sources. I hope they are really portable for Linux and Mac. I thought maybe Qt already has some functionality for that purpose.

[tanderson]

I have successfully used QProcess to use unrar on linux and mac. I believe it will work on windows also, but I haven't tested it.

/************************************************************************
Copyright 2009 Thomas Anderson
 
This file is part of QBinNews.
 
QBinNews is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
 
QBinNews is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with QBinNews.  If not, see <http://www.gnu.org/licenses/>.
**************************************************************************/
 
#include "qunrarthread.h"
#include <QDebug>
 
QUnrar::QUnrar() : scanCount(0)
{
    unrarProcess = new QProcess(this);
    connect (unrarProcess, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutputSlot()));
    connect (unrarProcess, SIGNAL(readyReadStandardError()), this, SLOT(readErrorSlot()));
    connect(unrarProcess, SIGNAL(finished(int,QProcess::ExitStatus)), this, SLOT(finished(int,QProcess::ExitStatus)));
}
 
void QUnrar::beginUnrarSlot(QSharedPointer<UnrarJob> job)
{
    scanCount=0;
    currentJob = job;
    //-o+ tells unrar to automatically overwrite.
    //-p- tells unrar to not prompt for password. Not sure what the outcome will be. think is will probably just end maybe with error?
    QStringList parameters;
    QString basePath(job->basePath + "/extracted");
    parameters << "e" << "-o+" << "-p-" << job->rarPath << basePath;
    qDebug() << "unrar launch: " << job->rarPath;
 
//    QDir temp(job->basePath);
    unrarProcess->setWorkingDirectory(job->basePath);
    unrarProcess->start(QString("unrar"), parameters);
    if (!unrarProcess->waitForStarted(500000))
        qDebug() << "process didn't start in QUnrar::beginUnrarSlot";
    if (logFile.isOpen())
        logFile.close();
    logFile.setFileName(job->basePath + "/unrarOut.txt");
    logFile.open(QIODevice::WriteOnly);
}
 
void QUnrar::finished(int exitCode, QProcess::ExitStatus exitStatus)
{
    logFile.close();
//    qDebug() << "inside QUnrar::finished. exitCode is "<< exitCode << "     exitStatus is " << exitStatus;
    emit endUnrarSignal(currentJob);
    currentJob.clear();
}
 
void QUnrar::readOutputSlot()
{
    while (unrarProcess->canReadLine())
    {
        QByteArray line(unrarProcess->readLine());
        //    qDebug() << line;
        if ((!line.contains('%')) && (!line.trimmed().isEmpty()))
        {
            line = line.trimmed();
            logFile.write(line);
            logFile.write("\n");
            if (line.contains("Extracting from"))
                scanCount++;
            //update progress
            int PercentComplete;
            double WorkPercent;
            WorkPercent = scanCount/(double)currentJob->rarCount;
            WorkPercent *= 100;
            PercentComplete = WorkPercent;
            emit UpdateProgressSignal(currentJob->jobId, PercentComplete);
        }
    }
}
 
void QUnrar::readErrorSlot()
{
    qDebug() << "error doing unrar";
    qDebug() << unrarProcess->readAllStandardError();
    if (unrarProcess->state() == QProcess::Running)
    {
        qDebug() << "attempting to terminate qunrarprocess.";
        unrarProcess->terminate();
    }
}
 
/////////////////////////////////////
 
QUnrarThread::QUnrarThread() : QThread(), unrarTest(false)
{
}
 
void QUnrarThread::run()
{
    QUnrar theUnrar;
    QUnrar *unrarPointer = &theUnrar;// i did this so the intellisense would show me the sigs and slots.
    connect(this, SIGNAL(beginUnrarSignal(QSharedPointer<UnrarJob>)), unrarPointer,
            SLOT(beginUnrarSlot(QSharedPointer<UnrarJob>)));
    connect(unrarPointer, SIGNAL(endUnrarSignal(QSharedPointer<UnrarJob>)), this,
            SLOT(endUnrarSlot(QSharedPointer<UnrarJob>)));
    connect(unrarPointer, SIGNAL(UpdateProgressSignal(int,int)), this, SIGNAL(UpdateProgressSignal(int,int)));
 
    exec();
}
 
 
void QUnrarThread::addUnrarSlot(QSharedPointer<UnrarJob> job)
{
    unrarQueue.enqueue(*job);
    sendJob();
}
 
void QUnrarThread::endUnrarSlot(QSharedPointer<UnrarJob> job)
{
    unrarTest = false;
    emit unrarDoneSignal(job);
    sendJob();
}
 
void QUnrarThread::sendJob()
{
    if (unrarQueue.isEmpty())
        return;
    if (unrarTest == false)
    {
        QSharedPointer<UnrarJob> tempJob = QSharedPointer<UnrarJob>(new UnrarJob());
        *tempJob = unrarQueue.dequeue();
        unrarTest = true;
        emit beginUnrarSignal(tempJob);
    }
}

/************************************************************************
Copyright 2009 Thomas Anderson

This file is part of QBinNews.

QBinNews is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

QBinNews is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with QBinNews.  If not, see <http://www.gnu.org/licenses/>.
**************************************************************************/

#include "qunrarthread.h"
#include <QDebug>

QUnrar::QUnrar() : scanCount(0)
{
    unrarProcess = new QProcess(this);
    connect (unrarProcess, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutputSlot()));
    connect (unrarProcess, SIGNAL(readyReadStandardError()), this, SLOT(readErrorSlot()));
    connect(unrarProcess, SIGNAL(finished(int,QProcess::ExitStatus)), this, SLOT(finished(int,QProcess::ExitStatus)));
}

void QUnrar::beginUnrarSlot(QSharedPointer<UnrarJob> job)
{
    scanCount=0;
    currentJob = job;
    //-o+ tells unrar to automatically overwrite.
    //-p- tells unrar to not prompt for password. Not sure what the outcome will be. think is will probably just end maybe with error?
    QStringList parameters;
    QString basePath(job->basePath + "/extracted");
    parameters << "e" << "-o+" << "-p-" << job->rarPath << basePath;
    qDebug() << "unrar launch: " << job->rarPath;

//    QDir temp(job->basePath);
    unrarProcess->setWorkingDirectory(job->basePath);
    unrarProcess->start(QString("unrar"), parameters);
    if (!unrarProcess->waitForStarted(500000))
        qDebug() << "process didn't start in QUnrar::beginUnrarSlot";
    if (logFile.isOpen())
        logFile.close();
    logFile.setFileName(job->basePath + "/unrarOut.txt");
    logFile.open(QIODevice::WriteOnly);
}

void QUnrar::finished(int exitCode, QProcess::ExitStatus exitStatus)
{
    logFile.close();
//    qDebug() << "inside QUnrar::finished. exitCode is "<< exitCode << "     exitStatus is " << exitStatus;
    emit endUnrarSignal(currentJob);
    currentJob.clear();
}

void QUnrar::readOutputSlot()
{
    while (unrarProcess->canReadLine())
    {
        QByteArray line(unrarProcess->readLine());
        //    qDebug() << line;
        if ((!line.contains('%')) && (!line.trimmed().isEmpty()))
        {
            line = line.trimmed();
            logFile.write(line);
            logFile.write("\n");
            if (line.contains("Extracting from"))
                scanCount++;
            //update progress
            int PercentComplete;
            double WorkPercent;
            WorkPercent = scanCount/(double)currentJob->rarCount;
            WorkPercent *= 100;
            PercentComplete = WorkPercent;
            emit UpdateProgressSignal(currentJob->jobId, PercentComplete);
        }
    }
}

void QUnrar::readErrorSlot()
{
    qDebug() << "error doing unrar";
    qDebug() << unrarProcess->readAllStandardError();
    if (unrarProcess->state() == QProcess::Running)
    {
        qDebug() << "attempting to terminate qunrarprocess.";
        unrarProcess->terminate();
    }
}

/////////////////////////////////////

QUnrarThread::QUnrarThread() : QThread(), unrarTest(false)
{
}

void QUnrarThread::run()
{
    QUnrar theUnrar;
    QUnrar *unrarPointer = &theUnrar;// i did this so the intellisense would show me the sigs and slots.
    connect(this, SIGNAL(beginUnrarSignal(QSharedPointer<UnrarJob>)), unrarPointer,
            SLOT(beginUnrarSlot(QSharedPointer<UnrarJob>)));
    connect(unrarPointer, SIGNAL(endUnrarSignal(QSharedPointer<UnrarJob>)), this,
            SLOT(endUnrarSlot(QSharedPointer<UnrarJob>)));
    connect(unrarPointer, SIGNAL(UpdateProgressSignal(int,int)), this, SIGNAL(UpdateProgressSignal(int,int)));

    exec();
}


void QUnrarThread::addUnrarSlot(QSharedPointer<UnrarJob> job)
{
    unrarQueue.enqueue(*job);
    sendJob();
}

void QUnrarThread::endUnrarSlot(QSharedPointer<UnrarJob> job)
{
    unrarTest = false;
    emit unrarDoneSignal(job);
    sendJob();
}

void QUnrarThread::sendJob()
{
    if (unrarQueue.isEmpty())
        return;
    if (unrarTest == false)
    {
        QSharedPointer<UnrarJob> tempJob = QSharedPointer<UnrarJob>(new UnrarJob());
        *tempJob = unrarQueue.dequeue();
        unrarTest = true;
        emit beginUnrarSignal(tempJob);
    }
}

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[mentalmushroom]

ok, thank you

[continuata]

Hi Tanderson, is there any chance you could provide the rest of the code? (Headers and UnrarJob class etc.)