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WSJT-X/MessageAggregator.cpp

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//
// MessageAggregator - an example application that utilizes the WSJT-X
// messaging facility
//
// This application is only provided as a simple GUI application
// example to demonstrate the WSJT-X messaging facility. It allows the
// user to set the server details either as a unicast UDP server or,
// if a multicast group address is provided, as a multicast server.
// The benefit of the multicast server is that multiple servers can be
// active at once each receiving all WSJT-X broadcast messages and
// each able to respond to individual WSJT_X clients. To utilize the
// multicast group features each WSJT-X client must set the same
// multicast group address as the UDP server address for example
// 239.255.0.0 for a site local multicast group.
//
// The UI is a small panel to input the service port number and
// optionally the multicast group address. Below that a table
// representing the log entries where any QSO logged messages
// broadcast from WSJT-X clients are displayed. The bottom of the
// application main window is a dock area where a dock window will
// appear for each WSJT-X client, this window contains a table of the
// current decode messages broadcast from that WSJT-X client and a
// status line showing the status update messages broadcast from the
// WSJT_X client. The dock windows may be arranged in a tab bar, side
// by side, below each other or, completely detached from the dock
// area as floating windows. Double clicking the dock window title bar
// or dragging and dropping with the mouse allows these different
// arrangements.
//
// The application also provides a simple menu bar including a view
// menu that allows each dock window to be hidden or revealed.
//
#include <iostream>
#include <exception>
#include <QtWidgets>
#include <QFile>
#include <QStandardItemModel>
#include <QStandardItem>
#include <QSortFilterProxyModel>
#include <QFont>
#include <QDateTime>
#include <QTime>
#include <QHash>
#include "MessageServer.hpp"
#include "NetworkMessage.hpp"
#include "qt_helpers.hpp"
using port_type = MessageServer::port_type;
using Frequency = MessageServer::Frequency;
//QRegExp message_alphabet {"[- A-Za-z0-9+./?]*"};
QRegExp message_alphabet {"[- @A-Za-z0-9+./?#<>]*"};
//
// Decodes Model - simple data model for all decodes
//
// The model is a basic table with uniform row format. Rows consist of
// QStandardItem instances containing the string representation of the
// column data and if the underlying field is not a string then the
// UserRole+1 role contains the underlying data item.
//
// Three slots are provided to add a new decode, remove all decodes
// for a client and, to build a reply to CQ message for a given row
// which is emitted as a signal respectively.
//
class DecodesModel
: public QStandardItemModel
{
Q_OBJECT;
public:
DecodesModel (QObject * parent = nullptr)
: QStandardItemModel {0, 7, parent}
, text_font_ {"Courier", 10}
{
setHeaderData (0, Qt::Horizontal, tr ("Client"));
setHeaderData (1, Qt::Horizontal, tr ("Time"));
setHeaderData (2, Qt::Horizontal, tr ("Snr"));
setHeaderData (3, Qt::Horizontal, tr ("DT"));
setHeaderData (4, Qt::Horizontal, tr ("DF"));
setHeaderData (5, Qt::Horizontal, tr ("Md"));
setHeaderData (6, Qt::Horizontal, tr ("Message"));
}
Q_SLOT void add_decode (bool is_new, QString const& client_id, QTime time, qint32 snr, float delta_time
, quint32 delta_frequency, QString const& mode, QString const& message)
{
if (!is_new)
{
int target_row {-1};
for (auto row = 0; row < rowCount (); ++row)
{
if (data (index (row, 0)).toString () == client_id)
{
auto row_time = item (row, 1)->data ().toTime ();
if (row_time == time
&& item (row, 2)->data ().toInt () == snr
&& item (row, 3)->data ().toFloat () == delta_time
&& item (row, 4)->data ().toUInt () == delta_frequency
&& data (index (row, 5)).toString () == mode
&& data (index (row, 6)).toString () == message)
{
return;
}
if (time <= row_time)
{
target_row = row; // last row with same time
}
}
}
if (target_row >= 0)
{
insertRow (target_row + 1, make_row (client_id, time, snr, delta_time, delta_frequency, mode, message));
return;
}
}
appendRow (make_row (client_id, time, snr, delta_time, delta_frequency, mode, message));
}
QList<QStandardItem *> make_row (QString const& client_id, QTime time, qint32 snr, float delta_time
, quint32 delta_frequency, QString const& mode, QString const& message) const
{
auto time_item = new QStandardItem {time.toString ("hh:mm")};
time_item->setData (time);
time_item->setTextAlignment (Qt::AlignRight);
auto snr_item = new QStandardItem {QString::number (snr)};
snr_item->setData (snr);
snr_item->setTextAlignment (Qt::AlignRight);
auto dt = new QStandardItem {QString::number (delta_time)};
dt->setData (delta_time);
dt->setTextAlignment (Qt::AlignRight);
auto df = new QStandardItem {QString::number (delta_frequency)};
df->setData (delta_frequency);
df->setTextAlignment (Qt::AlignRight);
auto md = new QStandardItem {mode};
md->setTextAlignment (Qt::AlignHCenter);
QList<QStandardItem *> row {
new QStandardItem {client_id}, time_item, snr_item, dt, df, md, new QStandardItem {message}};
Q_FOREACH (auto& item, row)
{
item->setEditable (false);
item->setFont (text_font_);
item->setTextAlignment (item->textAlignment () | Qt::AlignVCenter);
}
return row;
}
Q_SLOT void clear_decodes (QString const& client_id)
{
for (auto row = rowCount () - 1; row >= 0; --row)
{
if (data (index (row, 0)).toString () == client_id)
{
removeRow (row);
}
}
}
Q_SLOT void do_reply (QModelIndex const& source)
{
auto row = source.row ();
Q_EMIT reply (data (index (row, 0)).toString ()
, item (row, 1)->data ().toTime ()
, item (row, 2)->data ().toInt ()
, item (row, 3)->data ().toFloat ()
, item (row, 4)->data ().toInt ()
, data (index (row, 5)).toString ()
, data (index (row, 6)).toString ());
}
Q_SIGNAL void reply (QString const& id, QTime time, qint32 snr, float delta_time, quint32 delta_frequency
, QString const& mode, QString const& message);
private:
QFont text_font_;
};
//
// Beacons Model - simple data model for all beacon spots
//
// The model is a basic table with uniform row format. Rows consist of
// QStandardItem instances containing the string representation of the
// column data and if the underlying field is not a string then the
// UserRole+1 role contains the underlying data item.
//
// Two slots are provided to add a new decode and remove all spots for
// a client.
//
class BeaconsModel
: public QStandardItemModel
{
Q_OBJECT;
public:
BeaconsModel (QObject * parent = nullptr)
: QStandardItemModel {0, 9, parent}
, text_font_ {"Courier", 10}
{
setHeaderData (0, Qt::Horizontal, tr ("Client"));
setHeaderData (1, Qt::Horizontal, tr ("Time"));
setHeaderData (2, Qt::Horizontal, tr ("Snr"));
setHeaderData (3, Qt::Horizontal, tr ("DT"));
setHeaderData (4, Qt::Horizontal, tr ("Frequency"));
setHeaderData (5, Qt::Horizontal, tr ("Drift"));
setHeaderData (6, Qt::Horizontal, tr ("Callsign"));
setHeaderData (7, Qt::Horizontal, tr ("Grid"));
setHeaderData (8, Qt::Horizontal, tr ("Power"));
}
Q_SLOT void add_beacon_spot (bool is_new, QString const& client_id, QTime time, qint32 snr, float delta_time
, Frequency frequency, qint32 drift, QString const& callsign, QString const& grid
, qint32 power)
{
if (!is_new)
{
int target_row {-1};
for (auto row = 0; row < rowCount (); ++row)
{
if (data (index (row, 0)).toString () == client_id)
{
auto row_time = item (row, 1)->data ().toTime ();
if (row_time == time
&& item (row, 2)->data ().toInt () == snr
&& item (row, 3)->data ().toFloat () == delta_time
&& item (row, 4)->data ().value<Frequency> () == frequency
&& data (index (row, 5)).toInt () == drift
&& data (index (row, 6)).toString () == callsign
&& data (index (row, 7)).toString () == grid
&& data (index (row, 8)).toInt () == power)
{
return;
}
if (time <= row_time)
{
target_row = row; // last row with same time
}
}
}
if (target_row >= 0)
{
insertRow (target_row + 1, make_row (client_id, time, snr, delta_time, frequency, drift, callsign, grid, power));
return;
}
}
appendRow (make_row (client_id, time, snr, delta_time, frequency, drift, callsign, grid, power));
}
QList<QStandardItem *> make_row (QString const& client_id, QTime time, qint32 snr, float delta_time
, Frequency frequency, qint32 drift, QString const& callsign
, QString const& grid, qint32 power) const
{
auto time_item = new QStandardItem {time.toString ("hh:mm")};
time_item->setData (time);
time_item->setTextAlignment (Qt::AlignRight);
auto snr_item = new QStandardItem {QString::number (snr)};
snr_item->setData (snr);
snr_item->setTextAlignment (Qt::AlignRight);
auto dt = new QStandardItem {QString::number (delta_time)};
dt->setData (delta_time);
dt->setTextAlignment (Qt::AlignRight);
auto freq = new QStandardItem {Radio::pretty_frequency_MHz_string (frequency)};
freq->setData (frequency);
freq->setTextAlignment (Qt::AlignRight);
auto dri = new QStandardItem {QString::number (drift)};
dri->setData (drift);
dri->setTextAlignment (Qt::AlignRight);
auto gd = new QStandardItem {grid};
gd->setTextAlignment (Qt::AlignRight);
auto pwr = new QStandardItem {QString::number (power)};
pwr->setData (power);
pwr->setTextAlignment (Qt::AlignRight);
QList<QStandardItem *> row {
new QStandardItem {client_id}, time_item, snr_item, dt, freq, dri, new QStandardItem {callsign}, gd, pwr};
Q_FOREACH (auto& item, row)
{
item->setEditable (false);
item->setFont (text_font_);
item->setTextAlignment (item->textAlignment () | Qt::AlignVCenter);
}
return row;
}
Q_SLOT void clear_decodes (QString const& client_id)
{
for (auto row = rowCount () - 1; row >= 0; --row)
{
if (data (index (row, 0)).toString () == client_id)
{
removeRow (row);
}
}
}
private:
QFont text_font_;
};
class ClientWidget
: public QDockWidget
{
Q_OBJECT;
public:
explicit ClientWidget (QAbstractItemModel * decodes_model, QAbstractItemModel * beacons_model
, QString const& id, QWidget * parent = 0)
: QDockWidget {id, parent}
, id_ {id}
, decodes_table_view_ {new QTableView}
, beacons_table_view_ {new QTableView}
, message_line_edit_ {new QLineEdit}
, decodes_stack_ {new QStackedLayout}
, auto_off_button_ {new QPushButton {tr ("&Auto Off")}}
, halt_tx_button_ {new QPushButton {tr ("&Halt Tx")}}
, mode_label_ {new QLabel}
, dx_call_label_ {new QLabel}
, frequency_label_ {new QLabel}
, report_label_ {new QLabel}
{
// set up widgets
auto decodes_proxy_model = new IdFilterModel {id, this};
decodes_proxy_model->setSourceModel (decodes_model);
decodes_table_view_->setModel (decodes_proxy_model);
decodes_table_view_->verticalHeader ()->hide ();
decodes_table_view_->hideColumn (0);
decodes_table_view_->horizontalHeader ()->setStretchLastSection (true);
auto form_layout = new QFormLayout;
form_layout->addRow (tr ("Free text:"), message_line_edit_);
message_line_edit_->setValidator (new QRegExpValidator {message_alphabet, this});
connect (message_line_edit_, &QLineEdit::textEdited, [this] (QString const& text) {
Q_EMIT do_free_text (id_, text, false);
});
connect (message_line_edit_, &QLineEdit::editingFinished, [this] () {
Q_EMIT do_free_text (id_, message_line_edit_->text (), true);
});
auto decodes_page = new QWidget;
auto decodes_layout = new QVBoxLayout {decodes_page};
decodes_layout->setContentsMargins (QMargins {2, 2, 2, 2});
decodes_layout->addWidget (decodes_table_view_);
decodes_layout->addLayout (form_layout);
auto beacons_proxy_model = new IdFilterModel {id, this};
beacons_proxy_model->setSourceModel (beacons_model);
beacons_table_view_->setModel (beacons_proxy_model);
beacons_table_view_->verticalHeader ()->hide ();
beacons_table_view_->hideColumn (0);
beacons_table_view_->horizontalHeader ()->setStretchLastSection (true);
auto beacons_page = new QWidget;
auto beacons_layout = new QVBoxLayout {beacons_page};
beacons_layout->setContentsMargins (QMargins {2, 2, 2, 2});
beacons_layout->addWidget (beacons_table_view_);
decodes_stack_->addWidget (decodes_page);
decodes_stack_->addWidget (beacons_page);
// stack alternative views
auto content_layout = new QVBoxLayout;
content_layout->setContentsMargins (QMargins {2, 2, 2, 2});
content_layout->addLayout (decodes_stack_);
// set up controls
auto control_button_box = new QDialogButtonBox;
control_button_box->addButton (auto_off_button_, QDialogButtonBox::ActionRole);
control_button_box->addButton (halt_tx_button_, QDialogButtonBox::ActionRole);
connect (auto_off_button_, &QAbstractButton::clicked, [this] (bool /* checked */) {
Q_EMIT do_halt_tx (id_, true);
});
connect (halt_tx_button_, &QAbstractButton::clicked, [this] (bool /* checked */) {
Q_EMIT do_halt_tx (id_, false);
});
content_layout->addWidget (control_button_box);
// set up status area
auto status_bar = new QStatusBar;
status_bar->addPermanentWidget (mode_label_);
status_bar->addPermanentWidget (dx_call_label_);
status_bar->addPermanentWidget (frequency_label_);
status_bar->addPermanentWidget (report_label_);
content_layout->addWidget (status_bar);
connect (this, &ClientWidget::topLevelChanged, status_bar, &QStatusBar::setSizeGripEnabled);
// set up central widget
auto content_widget = new QFrame;
content_widget->setFrameStyle (QFrame::StyledPanel | QFrame::Sunken);
content_widget->setLayout (content_layout);
setWidget (content_widget);
// setMinimumSize (QSize {550, 0});
setFeatures (DockWidgetMovable | DockWidgetFloatable);
setAllowedAreas (Qt::BottomDockWidgetArea);
// connect up table view signals
connect (decodes_table_view_, &QTableView::doubleClicked, this, [this, decodes_proxy_model] (QModelIndex const& index) {
Q_EMIT do_reply (decodes_proxy_model->mapToSource (index));
});
}
Q_SLOT void update_status (QString const& id, Frequency f, QString const& mode, QString const& dx_call
, QString const& report, QString const& tx_mode, bool tx_enabled
, bool transmitting, bool decoding)
{
if (id == id_)
{
mode_label_->setText (QString {"Mode: %1%2"}
.arg (mode)
.arg (tx_mode.isEmpty () || tx_mode == mode ? "" : '(' + tx_mode + ')'));
dx_call_label_->setText ("DX CALL: " + dx_call);
frequency_label_->setText ("QRG: " + Radio::pretty_frequency_MHz_string (f));
report_label_->setText ("SNR: " + report);
update_dynamic_property (frequency_label_, "transmitting", transmitting);
auto_off_button_->setEnabled (tx_enabled);
halt_tx_button_->setEnabled (transmitting);
update_dynamic_property (mode_label_, "decoding", decoding);
}
}
Q_SLOT void decode_added (bool /*is_new*/, QString const& client_id, QTime /*time*/, qint32 /*snr*/
, float /*delta_time*/, quint32 /*delta_frequency*/, QString const& /*mode*/
, QString const& /*message*/)
{
if (client_id == id_)
{
decodes_stack_->setCurrentIndex (0);
decodes_table_view_->resizeColumnsToContents ();
decodes_table_view_->scrollToBottom ();
}
}
Q_SLOT void beacon_spot_added (bool /*is_new*/, QString const& client_id, QTime /*time*/, qint32 /*snr*/
, float /*delta_time*/, Frequency /*delta_frequency*/, qint32 /*drift*/, QString const& /*callsign*/
, QString const& /*grid*/, qint32 /*power*/)
{
if (client_id == id_)
{
decodes_stack_->setCurrentIndex (1);
beacons_table_view_->resizeColumnsToContents ();
beacons_table_view_->scrollToBottom ();
}
}
Q_SIGNAL void do_reply (QModelIndex const&);
Q_SIGNAL void do_halt_tx (QString const& id, bool auto_only);
Q_SIGNAL void do_free_text (QString const& id, QString const& text, bool);
private:
class IdFilterModel final
: public QSortFilterProxyModel
{
public:
IdFilterModel (QString const& id, QObject * parent = nullptr)
: QSortFilterProxyModel {parent}
, id_ {id}
{}
protected:
bool filterAcceptsRow (int source_row, QModelIndex const& source_parent) const override
{
auto source_index_col0 = sourceModel ()->index (source_row, 0, source_parent);
return sourceModel ()->data (source_index_col0).toString () == id_;
}
private:
QString id_;
};
QString id_;
QTableView * decodes_table_view_;
QTableView * beacons_table_view_;
QLineEdit * message_line_edit_;
QStackedLayout * decodes_stack_;
QAbstractButton * auto_off_button_;
QAbstractButton * halt_tx_button_;
QLabel * mode_label_;
QLabel * dx_call_label_;
QLabel * frequency_label_;
QLabel * report_label_;
};
class MainWindow
: public QMainWindow
{
Q_OBJECT;
public:
MainWindow ()
: log_ {new QStandardItemModel {0, 10, this}}
, decodes_model_ {new DecodesModel {this}}
, beacons_model_ {new BeaconsModel {this}}
, server_ {new MessageServer {this}}
, multicast_group_line_edit_ {new QLineEdit}
, log_table_view_ {new QTableView}
{
// logbook
log_->setHeaderData (0, Qt::Horizontal, tr ("Date/Time"));
log_->setHeaderData (1, Qt::Horizontal, tr ("Callsign"));
log_->setHeaderData (2, Qt::Horizontal, tr ("Grid"));
log_->setHeaderData (3, Qt::Horizontal, tr ("Name"));
log_->setHeaderData (4, Qt::Horizontal, tr ("Frequency"));
log_->setHeaderData (5, Qt::Horizontal, tr ("Mode"));
log_->setHeaderData (6, Qt::Horizontal, tr ("Sent"));
log_->setHeaderData (7, Qt::Horizontal, tr ("Rec'd"));
log_->setHeaderData (8, Qt::Horizontal, tr ("Power"));
log_->setHeaderData (9, Qt::Horizontal, tr ("Comments"));
connect (server_, &MessageServer::qso_logged, this, &MainWindow::log_qso);
// menu bar
auto file_menu = menuBar ()->addMenu (tr ("&File"));
auto exit_action = new QAction {tr ("E&xit"), this};
exit_action->setShortcuts (QKeySequence::Quit);
exit_action->setToolTip (tr ("Exit the application"));
file_menu->addAction (exit_action);
connect (exit_action, &QAction::triggered, this, &MainWindow::close);
view_menu_ = menuBar ()->addMenu (tr ("&View"));
// central layout
auto central_layout = new QVBoxLayout;
// server details
auto port_spin_box = new QSpinBox;
port_spin_box->setMinimum (1);
port_spin_box->setMaximum (std::numeric_limits<port_type>::max ());
auto group_box_layout = new QFormLayout;
group_box_layout->addRow (tr ("Port number:"), port_spin_box);
group_box_layout->addRow (tr ("Multicast Group (blank for unicast server):"), multicast_group_line_edit_);
auto group_box = new QGroupBox {tr ("Server Details")};
group_box->setLayout (group_box_layout);
central_layout->addWidget (group_box);
log_table_view_->setModel (log_);
log_table_view_->verticalHeader ()->hide ();
central_layout->addWidget (log_table_view_);
// central widget
auto central_widget = new QWidget;
central_widget->setLayout (central_layout);
// main window setup
setCentralWidget (central_widget);
setDockOptions (AnimatedDocks | AllowNestedDocks | AllowTabbedDocks);
setTabPosition (Qt::BottomDockWidgetArea, QTabWidget::North);
// connect up server
connect (server_, &MessageServer::error, [this] (QString const& message) {
QMessageBox::warning (this, tr ("Network Error"), message);
});
connect (server_, &MessageServer::client_opened, this, &MainWindow::add_client);
connect (server_, &MessageServer::client_closed, this, &MainWindow::remove_client);
connect (server_, &MessageServer::client_closed, decodes_model_, &DecodesModel::clear_decodes);
connect (server_, &MessageServer::client_closed, beacons_model_, &BeaconsModel::clear_decodes);
connect (server_, &MessageServer::decode, decodes_model_, &DecodesModel::add_decode);
connect (server_, &MessageServer::WSPR_decode, beacons_model_, &BeaconsModel::add_beacon_spot);
connect (server_, &MessageServer::clear_decodes, decodes_model_, &DecodesModel::clear_decodes);
connect (server_, &MessageServer::clear_decodes, beacons_model_, &BeaconsModel::clear_decodes);
connect (decodes_model_, &DecodesModel::reply, server_, &MessageServer::reply);
// UI behaviour
connect (port_spin_box, static_cast<void (QSpinBox::*)(int)> (&QSpinBox::valueChanged)
, [this] (port_type port) {server_->start (port);});
connect (multicast_group_line_edit_, &QLineEdit::editingFinished, [this, port_spin_box] () {
server_->start (port_spin_box->value (), QHostAddress {multicast_group_line_edit_->text ()});
});
port_spin_box->setValue (2237); // start up in unicast mode
show ();
}
Q_SLOT void log_qso (QString const& /*id*/, QDateTime time, QString const& dx_call, QString const& dx_grid
, Frequency dial_frequency, QString const& mode, QString const& report_sent
, QString const& report_received, QString const& tx_power, QString const& comments
, QString const& name)
{
QList<QStandardItem *> row;
row << new QStandardItem {time.toString ("dd-MMM-yyyy hh:mm")}
<< new QStandardItem {dx_call}
<< new QStandardItem {dx_grid}
<< new QStandardItem {name}
<< new QStandardItem {Radio::frequency_MHz_string (dial_frequency)}
<< new QStandardItem {mode}
<< new QStandardItem {report_sent}
<< new QStandardItem {report_received}
<< new QStandardItem {tx_power}
<< new QStandardItem {comments};
log_->appendRow (row);
log_table_view_->resizeColumnsToContents ();
log_table_view_->horizontalHeader ()->setStretchLastSection (true);
log_table_view_->scrollToBottom ();
}
private:
void add_client (QString const& id)
{
auto dock = new ClientWidget {decodes_model_, beacons_model_, id, this};
dock->setAttribute (Qt::WA_DeleteOnClose);
auto view_action = dock->toggleViewAction ();
view_action->setEnabled (true);
view_menu_->addAction (view_action);
addDockWidget (Qt::BottomDockWidgetArea, dock);
connect (server_, &MessageServer::status_update, dock, &ClientWidget::update_status);
connect (server_, &MessageServer::decode, dock, &ClientWidget::decode_added);
connect (server_, &MessageServer::WSPR_decode, dock, &ClientWidget::beacon_spot_added);
connect (dock, &ClientWidget::do_reply, decodes_model_, &DecodesModel::do_reply);
connect (dock, &ClientWidget::do_halt_tx, server_, &MessageServer::halt_tx);
connect (dock, &ClientWidget::do_free_text, server_, &MessageServer::free_text);
connect (view_action, &QAction::toggled, dock, &ClientWidget::setVisible);
dock_widgets_[id] = dock;
server_->replay (id);
}
void remove_client (QString const& id)
{
auto iter = dock_widgets_.find (id);
if (iter != std::end (dock_widgets_))
{
(*iter)->close ();
dock_widgets_.erase (iter);
}
}
QStandardItemModel * log_;
QMenu * view_menu_;
DecodesModel * decodes_model_;
BeaconsModel * beacons_model_;
MessageServer * server_;
QLineEdit * multicast_group_line_edit_;
QTableView * log_table_view_;
// maps client id to widgets
QHash<QString, ClientWidget *> dock_widgets_;
};
#include "MessageAggregator.moc"
int main (int argc, char * argv[])
{
QApplication app {argc, argv};
try
{
QObject::connect (&app, SIGNAL (lastWindowClosed ()), &app, SLOT (quit ()));
app.setApplicationName ("WSJT-X Reference UDP Message Aggregator Server");
app.setApplicationVersion ("1.0");
{
QFile file {":/qss/default.qss"};
if (!file.open (QFile::ReadOnly))
{
throw_qstring ("failed to open \"" + file.fileName () + "\": " + file.errorString ());
}
app.setStyleSheet (file.readAll());
}
MainWindow window;
return app.exec ();
}
catch (std::exception const & e)
{
QMessageBox::critical (nullptr, app.applicationName (), e.what ());
std:: cerr << "Error: " << e.what () << '\n';
}
catch (...)
{
QMessageBox::critical (nullptr, app.applicationName (), QObject::tr ("Unexpected error"));
std:: cerr << "Unexpected error\n";
}
return -1;
}
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