Qt 5.9 | Qt Assistant Manual | Simple Text Viewer Example | assistant.cpp Example File

Qt 5.9.2 Reference Documentation

# assistant.cpp Example File

simpletextviewer/assistant.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, you may use this file under the terms of the BSD license
      ** as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #include <QtCore/QByteArray>
      #include <QtCore/QDir>
      #include <QtCore/QLibraryInfo>
      #include <QtCore/QProcess>

      #include <QtWidgets/QMessageBox>

      #include "assistant.h"

      Assistant::Assistant()
          : proc(0)
      {
      }

      Assistant::~Assistant()
      {
          if (proc && proc->state() == QProcess::Running) {
              proc->terminate();
              proc->waitForFinished(3000);
          }
          delete proc;
      }

      void Assistant::showDocumentation(const QString &page)
      {
          if (!startAssistant())
              return;

          QByteArray ba("SetSource ");
          ba.append("qthelp://org.qt-project.examples.simpletextviewer/doc/");

          proc->write(ba + page.toLocal8Bit() + '\n');
      }

      bool Assistant::startAssistant()
      {
          if (!proc)
              proc = new QProcess();

          if (proc->state() != QProcess::Running) {
              QString app = QLibraryInfo::location(QLibraryInfo::BinariesPath) + QDir::separator();
      #if !defined(Q_OS_MAC)
              app += QLatin1String("assistant");
      #else
              app += QLatin1String("Assistant.app/Contents/MacOS/Assistant");
      #endif

              QStringList args;
              args << QLatin1String("-collectionFile")
                  << QLibraryInfo::location(QLibraryInfo::ExamplesPath)
                  + QLatin1String("/assistant/simpletextviewer/documentation/simpletextviewer.qhc")
                  << QLatin1String("-enableRemoteControl");

              proc->start(app, args);

              if (!proc->waitForStarted()) {
                  QMessageBox::critical(0, QObject::tr("Simple Text Viewer"),
                      QObject::tr("Unable to launch Qt Assistant (%1)").arg(app));
                  return false;
              }
          }
          return true;
      }