C++ QTemporaryFile::rename方法代码示例

bool QgsArchive::zip( const QString &filename )
{
  // create a temporary path
  QTemporaryFile tmpFile;
  tmpFile.open();
  tmpFile.close();

  // zip content
  if ( ! QgsZipUtils::zip( tmpFile.fileName(), mFiles ) )
  {
    QString err = QObject::tr( "Unable to zip content" );
    QgsMessageLog::logMessage( err, QStringLiteral( "QgsArchive" ) );
    return false;
  }

  // remove existing zip file
  if ( QFile::exists( filename ) )
    QFile::remove( filename );

  // save zip archive
  if ( ! tmpFile.rename( filename ) )
  {
    QString err = QObject::tr( "Unable to save zip file '%1'" ).arg( filename );
    QgsMessageLog::logMessage( err, QStringLiteral( "QgsArchive" ) );
    return false;
  }

  // keep the zip filename
  tmpFile.setAutoRemove( false );

  return true;
}

void
writeXml( const QDomDocument& xml, const QString& path )
{
    // we write to a temporary file, and then do an atomic move
    // this prevents the client from potentially reading a corrupt XML file
    QTemporaryFile f;

    f.setAutoRemove( false );
    
    if (!f.open())
        throw "Couldn't write XML";

    QTextStream s( &f );
    xml.save( s, 2 );
    
    if ( !f.rename( path ) )
        throw QString("Couldn't move to ") + path;
}

//.........这里部分代码省略.........
    QTemporaryFile file(input.outputPath);
    if (!file.open()) {
        throw Error(QString::fromLatin1("Cannot copy %1 to %2: %3").arg(input.installerExePath,
            input.outputPath, file.errorString()));
    }

    const QString tempFile = file.fileName();
    file.close();
    file.remove();

    QFile instExe(input.installerExePath);
    if (!instExe.copy(tempFile)) {
        throw Error(QString::fromLatin1("Cannot copy %1 to %2: %3").arg(instExe.fileName(),
            tempFile, instExe.errorString()));
    }

    QtPatch::patchBinaryFile(tempFile, QByteArray("MY_InstallerCreateDateTime_MY"),
        QDateTime::currentDateTime().toString(QLatin1String("yyyy-MM-dd - HH:mm:ss")).toLatin1());


    input.installerExePath = tempFile;

#if defined(Q_OS_WIN)
    // setting the windows icon must happen before we append our binary data - otherwise they get lost :-/
    if (QFile::exists(settings.installerApplicationIcon())) {
        // no error handling as this is not fatal
        setApplicationIcon(tempFile, settings.installerApplicationIcon());
    }
#elif defined(Q_OS_OSX)
    if (isBundle) {
        // no error handling as this is not fatal
        const QString copyscript = QDir::temp().absoluteFilePath(QLatin1String("copylibsintobundle.sh"));
        QFile::copy(QLatin1String(":/resources/copylibsintobundle.sh"), copyscript);
        QFile::rename(tempFile, input.outputPath);
        chmod755(copyscript);
        QProcess p;
        p.start(copyscript, QStringList() << bundle);
        p.waitForFinished(-1);
        QFile::rename(input.outputPath, tempFile);
        QFile::remove(copyscript);
    }
#endif

    QTemporaryFile out;
    QString targetName = input.outputPath;
#ifdef Q_OS_OSX
    QDir resourcePath(QFileInfo(input.outputPath).dir());
    resourcePath.cdUp();
    resourcePath.cd(QLatin1String("Resources"));
    targetName = resourcePath.filePath(QLatin1String("installer.dat"));
#endif

    {
        QFile target(targetName);
        if (target.exists() && !target.remove()) {
            qCritical("Cannot remove target %s: %s", qPrintable(target.fileName()),
                qPrintable(target.errorString()));
            QFile::remove(tempFile);
            return EXIT_FAILURE;
        }
    }

    try {
        QInstaller::openForWrite(&out);
        QFile exe(input.installerExePath);

void HistoryManager::save()
{
    QSettings settings;
    settings.beginGroup(QLatin1String("history"));
    settings.setValue(QLatin1String("historyLimit"), m_historyLimit);

    bool saveAll = m_lastSavedUrl.isEmpty();
    int first = m_history.count() - 1;
    if (!saveAll) {
        // find the first one to save
        for (int i = 0; i < m_history.count(); ++i) {
            if (m_history.at(i).url == m_lastSavedUrl) {
                first = i - 1;
                break;
            }
        }
    }
    if (first == m_history.count() - 1)
        saveAll = true;

    QString directory = QStandardPaths::writableLocation(QStandardPaths::DataLocation);
    if (directory.isEmpty())
        directory = QDir::homePath() + QLatin1String("/.") + QCoreApplication::applicationName();
    if (!QFile::exists(directory)) {
        QDir dir;
        dir.mkpath(directory);
    }

    QFile historyFile(directory + QLatin1String("/history"));
    // When saving everything use a temporary file to prevent possible data loss.
    QTemporaryFile tempFile;
    tempFile.setAutoRemove(false);
    bool open = false;
    if (saveAll) {
        open = tempFile.open();
    } else {
        open = historyFile.open(QFile::Append);
    }

    if (!open) {
        qWarning() << "Unable to open history file for saving"
                   << (saveAll ? tempFile.fileName() : historyFile.fileName());
        return;
    }

    QDataStream out(saveAll ? &tempFile : &historyFile);
    for (int i = first; i >= 0; --i) {
        QByteArray data;
        QDataStream stream(&data, QIODevice::WriteOnly);
        HistoryItem item = m_history.at(i);
        stream << HISTORY_VERSION << item.url << item.dateTime << item.title;
        out << data;
    }
    tempFile.close();

    if (saveAll) {
        if (historyFile.exists() && !historyFile.remove())
            qWarning() << "History: error removing old history." << historyFile.errorString();
        if (!tempFile.rename(historyFile.fileName()))
            qWarning() << "History: error moving new history over old." << tempFile.errorString() << historyFile.fileName();
    }
    m_lastSavedUrl = m_history.value(0).url;
}