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

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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;
 }