Copy directory using Qt

Question

I want to copy a directory from one drive to another drive. My selected directory contains many sub directories and files.

How can I implement the same using Qt?

Answer 1

This is basically petch's answer with a slight change due to it breaking for me in Qt 5.6 (this is the top question hit), so all credit goes to petch.

function

bool copyPath(QString sourceDir, QString destinationDir, bool overWriteDirectory)
{
    QDir originDirectory(sourceDir);

    if (! originDirectory.exists())
    {
        return false;
    }

    QDir destinationDirectory(destinationDir);

    if(destinationDirectory.exists() && !overWriteDirectory)
    {
        return false;
    }
    else if(destinationDirectory.exists() && overWriteDirectory)
    {
        destinationDirectory.removeRecursively();
    }

    originDirectory.mkpath(destinationDir);

    foreach (QString directoryName, originDirectory.entryList(QDir::Dirs | \
                                                              QDir::NoDotAndDotDot))
    {
        QString destinationPath = destinationDir + "/" + directoryName;
        originDirectory.mkpath(destinationPath);
        copyPath(sourceDir + "/" + directoryName, destinationPath, overWriteDirectory);
    }

    foreach (QString fileName, originDirectory.entryList(QDir::Files))
    {
        QFile::copy(sourceDir + "/" + fileName, destinationDir + "/" + fileName);
    }

    /*! Possible race-condition mitigation? */
    QDir finalDestination(destinationDir);
    finalDestination.refresh();

    if(finalDestination.exists())
    {
        return true;
    }

    return false;
}

Use:

/*! Overwrite existing directories. */
bool directoryCopied = copyPath(sourceDirectory, destinationDirectory, true);

/*! Do not overwrite existing directories. */
bool directoryCopied = copyPath(sourceDirectory, destinationDirectory, false);