main.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the QtWebChannel module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
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  #include "qwebchannel.h"

  #include <QApplication>
  #include <QDialog>
  #include <QVariantMap>
  #include <QDesktopServices>
  #include <QUrl>
  #include <QDir>
  #include <QFileInfo>
  #include <QtWebSockets/QWebSocketServer>

  #include "../shared/websocketclientwrapper.h"
  #include "../shared/websockettransport.h"

  #include "ui_dialog.h"

  /*!
      An instance of this class gets published over the WebChannel and is then accessible to HTML clients.
  */
  class Dialog : public QObject
  {
      Q_OBJECT

  public:
      explicit Dialog(QObject *parent = 0)
          : QObject(parent)
      {
          ui.setupUi(&dialog);
          dialog.show();

          connect(ui.send, SIGNAL(clicked()), SLOT(clicked()));
      }

      void displayMessage(const QString &message)
      {
          ui.output->appendPlainText(message);
      }

  signals:
      /*!
          This signal is emitted from the C++ side and the text displayed on the HTML client side.
      */
      void sendText(const QString &text);

  public slots:
      /*!
          This slot is invoked from the HTML client side and the text displayed on the server side.
      */
      void receiveText(const QString &text)
      {
          displayMessage(tr("Received message: %1").arg(text));
      }

  private slots:
      /*!
          Note that this slot is private and thus not accessible to HTML clients.
      */
      void clicked()
      {
          const QString text = ui.input->text();

          if (text.isEmpty()) {
              return;
          }

          emit sendText(text);
          displayMessage(tr("Sent message: %1").arg(text));

          ui.input->clear();
      }

  private:
      QDialog dialog;
      Ui::Dialog ui;
  };

  int main(int argc, char** argv)
  {
      QApplication app(argc, argv);

      QFileInfo jsFileInfo(QDir::currentPath() + "/qwebchannel.js");

      if (!jsFileInfo.exists())
          QFile::copy(":/qtwebchannel/qwebchannel.js",jsFileInfo.absoluteFilePath());

      // setup the QWebSocketServer
      QWebSocketServer server(QStringLiteral("QWebChannel Standalone Example Server"), QWebSocketServer::NonSecureMode);
      if (!server.listen(QHostAddress::LocalHost, 12345)) {
          qFatal("Failed to open web socket server.");
          return 1;
      }

      // wrap WebSocket clients in QWebChannelAbstractTransport objects
      WebSocketClientWrapper clientWrapper(&server);

      // setup the channel
      QWebChannel channel;
      QObject::connect(&clientWrapper, &WebSocketClientWrapper::clientConnected,
                       &channel, &QWebChannel::connectTo);

      // setup the dialog and publish it to the QWebChannel
      Dialog dialog;
      channel.registerObject(QStringLiteral("dialog"), &dialog);

      // open a browser window with the client HTML page
      QUrl url = QUrl::fromLocalFile(BUILD_DIR "/index.html");
      QDesktopServices::openUrl(url);

      dialog.displayMessage(QObject::tr("Initialization complete, opening browser at %1.").arg(url.toDisplayString()));

      return app.exec();
  }

  #include "main.moc"