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** This file is part of the examples of the Qt Toolkit.

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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)

{

}

//! [0]

Assistant::~Assistant()

{

    if (proc && proc->state() == QProcess::Running) {

        proc->terminate();

        proc->waitForFinished(3000);

    }

    delete proc;

}

//! [0]

//! [1]

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() + '\n');

}

//! [1]

//! [2]

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;

}

//! [2]