Revision control
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ //! [6]
++ QHelpEngineCore helpEngine("mycollection.qhc");
++ ...
++
++ // get all file references for the identifier
++ QList<QHelpLink> links =
++ helpEngine.documentsForIdentifier(QLatin1String("MyDialog::ChangeButton"));
++
++ // If help is available for this keyword, get the help data
++ // of the first file reference.
++ if (links.count()) {
++ QByteArray helpData = helpEngine->fileData(links.constBegin()->url);
++ // show the documentation to the user
++ if (!helpData.isEmpty())
++ displayHelp(helpData);
++ }
++ //! [6]
++
++