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

Qt 5.9.9 Reference Documentation

# assistant.cpp Example File

simpletextviewer/assistant.cpp

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      #include "assistant.h"

      #include <QByteArray>
      #include <QDir>
      #include <QLibraryInfo>
      #include <QMessageBox>
      #include <QProcess>

      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(nullptr,
                                        tr("Simple Text Viewer"),
                                        tr("Unable to launch Qt Assistant (%1)").arg(app));
                  return false;
              }
          }
          return true;
      }