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

The hard way. Copy every file individually.

• Use QDir::entryList() to iterate over the content of a directory
• Use QDir::cd() and QDir::cdUp() to go in and out of directories
• Use QDir::mkdir() and QDir::mkpath() to create the new folders tree
• and finally, use QFile::copy() to copy the actual files

Answer 2

http://lists.trolltech.com/qt-interest/2003-05/thread01274-0.html

(scroll down some in the thread, there is an example for Qt. It might not be 100% up to date. As it seems it is not possible to do that uber-conveniently)

Answer 3

Manually, you can do the next things:

1). with func below you generate folders/files list (recursively) - the destination files.

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());
    }
}

2). then you may to start copying files from destination list to the new source directory like that:

for (int i = 0; i < gtdStringList.count(); i++) {

    progressDialog.setValue(i);
    progressDialog.setLabelText(tr("%1 Coping file number %2 of %3 ")
        .arg((conf->isConsole) ? tr("Making copy of the Alta-GTD\n") : "")
        .arg(i + 1)
        .arg(gtdStringList.count()));

    qApp->processEvents(QEventLoop::ExcludeUserInputEvents);

    if (progressDialog.wasCanceled()) {

        // removing tmp files/folders
        rmDirectoryRecursive(tmpFolder);
        rmDirectoryRecursive(tmpFolderPlus);
        setEnableGUI(true);
        return;
    }

    // coping
    if (!QFile::copy(gtdStringList.at(i), tmpStringList.at(i))) {

        if (warningFlag) {

            QMessageBox box(this);
            QString name = tr("Question");
            QString file1 = getShortName(gtdStringList.at(i), QString("\\...\\"));
            QString file2 = getShortName(tmpStringList.at(i), QString("\\...\\"));
            QString text = tr("Cannot copy <b>%1</b> <p>to <b>%2</b>"   \
               "<p>This file will be ignored, just press <b>Yes</b> button" \
               "<p>Press <b>YesToAll</b> button to ignore other warnings automatically..."  \
               "<p>Or press <b>Abort</b> to cancel operation").arg(file1).arg(file2);

            box.setModal(true);
            box.setWindowTitle(name);
            box.setText(QString::fromLatin1("%1").arg(text));
            box.setIcon(QMessageBox::Question);
            box.setStandardButtons(QMessageBox::YesToAll | QMessageBox::Yes | QMessageBox::Abort);

            switch (box.exec()) {                   
                case (QMessageBox::YesToAll):
                    warningFlag = false;
                    break;
                case (QMessageBox::Yes):
                    break;
                case (QMessageBox::Abort):
                    rmDirectoryRecursive(tmpFolder);
                    rmDirectoryRecursive(tmpFolderPlus);
                    setEnableGUI(true);
                    return;
            }
        }
    }
}

And that's all. Good luck!