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# assistant.cpp Example File
help/simpletextviewer/assistant.cpp

     /****************************************************************************
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     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
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     #include <QtCore/QByteArray>
     #include <QtCore/QDir>
     #include <QtCore/QLibraryInfo>
     #include <QtCore/QProcess>

     #include <QtGui/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://com.trolltech.examples.simpletextviewer/doc/");

         proc->write(ba + page.toLocal8Bit() + '\0');
     }

     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("/help/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;
     }