void TripPlanner::init(){    connect(&socket, SIGNAL(connected()),            this, SLOT(sendRequest()));    connect(&socket, SIGNAL(connectionClosed()),            this, SLOT(connectionClosedByServer()));    connect(&socket, SIGNAL(readyRead()),            this, SLOT(updateListView()));    connect(&socket, SIGNAL(error(int)),            this, SLOT(error(int)));    connect(&connectionTimer, SIGNAL(timeout()),            this, SLOT(connectionTimeout()));    connect(&progressBarTimer, SIGNAL(timeout()),            this, SLOT(advanceProgressBar()));    QDateTime dateTime = QDateTime::currentDateTime();    dateEdit->setDate(dateTime.date());    timeEdit->setTime(QTime(dateTime.time().hour(), 0));}void TripPlanner::advanceProgressBar(){    progressBar->setProgress(progressBar->progress() + 2);}void TripPlanner::connectToServer(){    listView->clear();#if 1    socket.connectToHost("localhost", 6178);#else    socket.connectToHost("tripserver.zugbahn.de", 6178);#endif    searchButton->setEnabled(false);    stopButton->setEnabled(true);    statusLabel->setText(tr("Connecting to server..."));    connectionTimer.start(30 * 1000, true);    progressBarTimer.start(200, false);    blockSize = 0;}void TripPlanner::sendRequest(){    QByteArray block;    QDataStream out(block, IO_WriteOnly);    out.setVersion(5);    out << (Q_UINT16)0 << (Q_UINT8)'S'        << fromComboBox->currentText()        << toComboBox->currentText() << dateEdit->date()        << timeEdit->time();    if (departureRadioButton->isOn())        out << (Q_UINT8)'D';    else        out << (Q_UINT8)'A';    out.device()->at(0);    out << (Q_UINT16)(block.size() - sizeof(Q_UINT16));    socket.writeBlock(block.data(), block.size());    statusLabel->setText(tr("Sending request..."));}void TripPlanner::updateListView(){    connectionTimer.start(30 * 1000, true);    QDataStream in(&socket);    in.setVersion(5);    for (;;) {        if (blockSize == 0) {            if (socket.bytesAvailable() < sizeof(Q_UINT16))                break;            in >> blockSize;        }        if (blockSize == 0xFFFF) {            closeConnection();            statusLabel->setText(tr("Found %1 trip(s)")                                 .arg(listView->childCount()));            break;        }        if (socket.bytesAvailable() < blockSize)            break;        QDate date;        QTime departureTime;        QTime arrivalTime;        Q_UINT16 duration;        Q_UINT8 changes;        QString trainType;        in >> date >> departureTime >> duration >> changes           >> trainType;        arrivalTime = departureTime.addSecs(duration * 60);        new QListViewItem(listView,                          date.toString(LocalDate),                          departureTime.toString(tr("hh:mm")),                          arrivalTime.toString(tr("hh:mm")),                          tr("%1 hr %2 min").arg(duration / 60)                                            .arg(duration % 60),                          QString::number(changes),                          trainType);        blockSize = 0;    }}void TripPlanner::closeConnection(){    socket.close();    searchButton->setEnabled(true);    stopButton->setEnabled(false);    connectionTimer.stop();    progressBarTimer.stop();    progressBar->setProgress(0);}void TripPlanner::stopSearch(){    statusLabel->setText(tr("Search stopped"));    closeConnection();}void TripPlanner::connectionTimeout(){    statusLabel->setText(tr("Error: Connection timed out"));    closeConnection();}void TripPlanner::connectionClosedByServer(){    if (blockSize != 0xFFFF)        statusLabel->setText(tr("Error: Connection closed by "                                "server"));    closeConnection();}void TripPlanner::error(int code){    QString message;    switch (code) {    case QSocket::ErrConnectionRefused:        message = tr("Error: Connection refused");        break;    case QSocket::ErrHostNotFound:        message = tr("Error: Server not found");        break;    case QSocket::ErrSocketRead:    default:        message = tr("Error: Data transfer failed");    }    statusLabel->setText(message);    closeConnection();}