mainwindow.cpp Example File

secureudpclient/mainwindow.cpp
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#include <QtCore> #include <QtNetwork> #include "addressdialog.h" #include "association.h" #include "mainwindow.h" #include "ui_mainwindow.h" #include <utility> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow), nameTemplate(QStringLiteral("Alice (clone number %1)")) { ui->setupUi(this); updateUi(); } MainWindow::~MainWindow() { delete ui; } const QString colorizer(QStringLiteral("<font color=\"%1\">%2</font><br>")); void MainWindow::addErrorMessage(const QString &message) { ui->clientMessages->insertHtml(colorizer.arg(QStringLiteral("Crimson"), message)); } void MainWindow::addWarningMessage(const QString &message) { ui->clientMessages->insertHtml(colorizer.arg(QStringLiteral("DarkOrange"), message)); } void MainWindow::addInfoMessage(const QString &message) { ui->clientMessages->insertHtml(colorizer.arg(QStringLiteral("DarkBlue"), message)); } void MainWindow::addServerResponse(const QString &clientInfo, const QByteArray &datagram, const QByteArray &plainText) { static const QString messageColor = QStringLiteral("DarkMagenta"); static const QString formatter = QStringLiteral("<br>---------------" "<br>%1 received a DTLS datagram:<br> %2" "<br>As plain text:<br> %3"); const QString html = formatter.arg(clientInfo, QString::fromUtf8(datagram.toHex(' ')), QString::fromUtf8(plainText)); ui->serverMessages->insertHtml(colorizer.arg(messageColor, html)); } void MainWindow::on_connectButton_clicked() { if (lookupId != -1) { QHostInfo::abortHostLookup(lookupId); lookupId = -1; port = 0; updateUi(); return; } AddressDialog dialog; if (dialog.exec() != QDialog::Accepted) return; const QString hostName = dialog.remoteName(); if (hostName.isEmpty()) return addWarningMessage(tr("Host name or address required to connect")); port = dialog.remotePort(); QHostAddress remoteAddress; if (remoteAddress.setAddress(hostName)) return startNewConnection(remoteAddress); addInfoMessage(tr("Looking up the host ...")); lookupId = QHostInfo::lookupHost(hostName, this, SLOT(lookupFinished(QHostInfo))); updateUi(); } void MainWindow::updateUi() { ui->connectButton->setText(lookupId == -1 ? tr("Connect ...") : tr("Cancel lookup")); ui->shutdownButton->setEnabled(connections.size() != 0); } void MainWindow::lookupFinished(const QHostInfo &hostInfo) { if (hostInfo.lookupId() != lookupId) return; lookupId = -1; updateUi(); if (hostInfo.error() != QHostInfo::NoError) { addErrorMessage(hostInfo.errorString()); return; } const QList<QHostAddress> foundAddresses = hostInfo.addresses(); if (foundAddresses.empty()) { addWarningMessage(tr("Host not found")); return; } const auto remoteAddress = foundAddresses.at(0); addInfoMessage(tr("Connecting to: %1").arg(remoteAddress.toString())); startNewConnection(remoteAddress); } void MainWindow::startNewConnection(const QHostAddress &address) { AssocPtr newConnection(new DtlsAssociation(address, port, nameTemplate.arg(nextId))); connect(newConnection.data(), &DtlsAssociation::errorMessage, this, &MainWindow::addErrorMessage); connect(newConnection.data(), &DtlsAssociation::warningMessage, this, &MainWindow::addWarningMessage); connect(newConnection.data(), &DtlsAssociation::infoMessage, this, &MainWindow::addInfoMessage); connect(newConnection.data(), &DtlsAssociation::serverResponse, this, &MainWindow::addServerResponse); connections.push_back(std::move(newConnection)); connections.back()->startHandshake(); updateUi(); ++nextId; } void MainWindow::on_shutdownButton_clicked() { connections.clear(); updateUi(); }