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# sslclient.cpp Example File
network/securesocketclient/sslclient.cpp

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     #include "certificateinfo.h"
     #include "sslclient.h"
     #include "ui_sslclient.h"
     #include "ui_sslerrors.h"

     #include <QtGui/QScrollBar>
     #include <QtGui/QStyle>
     #include <QtGui/QToolButton>
     #include <QtNetwork/QSslCipher>

     SslClient::SslClient(QWidget *parent)
         : QWidget(parent), socket(0), padLock(0), executingDialog(false)
     {
         form = new Ui_Form;
         form->setupUi(this);
         form->hostNameEdit->setSelection(0, form->hostNameEdit->text().size());
         form->sessionOutput->setHtml(tr("&lt;not connected&gt;"));

         connect(form->hostNameEdit, SIGNAL(textChanged(QString)),
                 this, SLOT(updateEnabledState()));
         connect(form->connectButton, SIGNAL(clicked()),
                 this, SLOT(secureConnect()));
         connect(form->sendButton, SIGNAL(clicked()),
                 this, SLOT(sendData()));
     }

     SslClient::~SslClient()
     {
         delete form;
     }

     void SslClient::updateEnabledState()
     {
         bool unconnected = !socket || socket->state() == QAbstractSocket::UnconnectedState;

         form->hostNameEdit->setReadOnly(!unconnected);
         form->hostNameEdit->setFocusPolicy(unconnected ? Qt::StrongFocus : Qt::NoFocus);

         form->hostNameLabel->setEnabled(unconnected);
         form->portBox->setEnabled(unconnected);
         form->portLabel->setEnabled(unconnected);
         form->connectButton->setEnabled(unconnected && !form->hostNameEdit->text().isEmpty());

         bool connected = socket && socket->state() == QAbstractSocket::ConnectedState;
         form->sessionBox->setEnabled(connected);
         form->sessionOutput->setEnabled(connected);
         form->sessionInput->setEnabled(connected);
         form->sessionInputLabel->setEnabled(connected);
         form->sendButton->setEnabled(connected);
     }

     void SslClient::secureConnect()
     {
         if (!socket) {
             socket = new QSslSocket(this);
             connect(socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
                     this, SLOT(socketStateChanged(QAbstractSocket::SocketState)));
             connect(socket, SIGNAL(encrypted()),
                     this, SLOT(socketEncrypted()));
             connect(socket, SIGNAL(sslErrors(QList<QSslError>)),
                     this, SLOT(sslErrors(QList<QSslError>)));
             connect(socket, SIGNAL(readyRead()),
                     this, SLOT(socketReadyRead()));
         }

         socket->connectToHostEncrypted(form->hostNameEdit->text(), form->portBox->value());
         updateEnabledState();
     }

     void SslClient::socketStateChanged(QAbstractSocket::SocketState state)
     {
         if (executingDialog)
             return;

         updateEnabledState();
         if (state == QAbstractSocket::UnconnectedState) {
             form->hostNameEdit->setPalette(QPalette());
             form->hostNameEdit->setFocus();
             form->cipherLabel->setText(tr("<none>"));
             if (padLock)
                 padLock->hide();
             socket->deleteLater();
             socket = 0;
         }
     }

     void SslClient::socketEncrypted()
     {
         if (!socket)
             return;                 // might have disconnected already

         form->sessionOutput->clear();
         form->sessionInput->setFocus();

         QPalette palette;
         palette.setColor(QPalette::Base, QColor(255, 255, 192));
         form->hostNameEdit->setPalette(palette);

         QSslCipher ciph = socket->sessionCipher();
         QString cipher = QString("%1, %2 (%3/%4)").arg(ciph.authenticationMethod())
                          .arg(ciph.name()).arg(ciph.usedBits()).arg(ciph.supportedBits());;
         form->cipherLabel->setText(cipher);

         if (!padLock) {
             padLock = new QToolButton;
             padLock->setIcon(QIcon(":/encrypted.png"));
     #ifndef QT_NO_CURSOR
             padLock->setCursor(Qt::ArrowCursor);
     #endif
             padLock->setToolTip(tr("Display encryption details."));

             int extent = form->hostNameEdit->height() - 2;
             padLock->resize(extent, extent);
             padLock->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Ignored);

             QHBoxLayout *layout = new QHBoxLayout(form->hostNameEdit);
             layout->setMargin(form->hostNameEdit->style()->pixelMetric(QStyle::PM_DefaultFrameWidth));
             layout->setSpacing(0);
             layout->addStretch();
             layout->addWidget(padLock);

             form->hostNameEdit->setLayout(layout);

             connect(padLock, SIGNAL(clicked()),
                     this, SLOT(displayCertificateInfo()));
         } else {
             padLock->show();
         }
     }

     void SslClient::socketReadyRead()
     {
         appendString(QString::fromUtf8(socket->readAll()));
     }

     void SslClient::sendData()
     {
         QString input = form->sessionInput->text();
         appendString(input + '\n');
         socket->write(input.toUtf8() + "\r\n");
         form->sessionInput->clear();
     }

     void SslClient::sslErrors(const QList<QSslError> &errors)
     {
         QDialog errorDialog(this);
         Ui_SslErrors ui;
         ui.setupUi(&errorDialog);
         connect(ui.certificateChainButton, SIGNAL(clicked()),
                 this, SLOT(displayCertificateInfo()));

         foreach (const QSslError &error, errors)
             ui.sslErrorList->addItem(error.errorString());

         executingDialog = true;
         if (errorDialog.exec() == QDialog::Accepted)
             socket->ignoreSslErrors();
         executingDialog = false;

         // did the socket state change?
         if (socket->state() != QAbstractSocket::ConnectedState)
             socketStateChanged(socket->state());
     }

     void SslClient::displayCertificateInfo()
     {
         CertificateInfo *info = new CertificateInfo(this);
         info->setCertificateChain(socket->peerCertificateChain());
         info->exec();
         info->deleteLater();
     }

     void SslClient::appendString(const QString &line)
     {
         QTextCursor cursor(form->sessionOutput->textCursor());
         cursor.movePosition(QTextCursor::End);
         cursor.insertText(line);
         form->sessionOutput->verticalScrollBar()->setValue(form->sessionOutput->verticalScrollBar()->maximum());
     }