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QFileSystemWatcher/Windows: Fix crash when no QCoreApplication is present

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Rewrite instantiation of QWindowsRemovableDriveListener to check
for the presence of the event dispatcher.

Task-number: QTBUG-62242
Change-Id: Ibb5726864058593e5341e0d411aaf5432e2f108a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Friedemann Kleint 2017-08-02 09:00:27 +02:00
parent 245d83bb50
commit e612fe8d47
2 changed files with 24 additions and 23 deletions
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45
src/corelib/io/qfilesystemwatcher_win.cpp
View File

@ -127,16 +127,10 @@ private:
quintptr m_lastMessageHash;
};
static inline QEventDispatcherWin32 *winEventDispatcher()
{
return static_cast<QEventDispatcherWin32 *>(QCoreApplication::instance()->eventDispatcher());
}
QWindowsRemovableDriveListener::QWindowsRemovableDriveListener(QObject *parent)
: QObject(parent)
, m_lastMessageHash(0)
{
winEventDispatcher()->installNativeEventFilter(this);
}
static void stopDeviceNotification(QWindowsRemovableDriveListener::RemovableDriveEntry &e)
@ -314,7 +308,8 @@ void QWindowsRemovableDriveListener::addPath(const QString &p)
notify.dbch_size = sizeof(notify);
notify.dbch_devicetype = DBT_DEVTYP_HANDLE;
notify.dbch_handle = volumeHandle;
re.devNotify = RegisterDeviceNotification(winEventDispatcher()->internalHwnd(),
QEventDispatcherWin32 *winEventDispatcher = static_cast<QEventDispatcherWin32 *>(QCoreApplication::eventDispatcher());
re.devNotify = RegisterDeviceNotification(winEventDispatcher->internalHwnd(),
&notify, DEVICE_NOTIFY_WINDOW_HANDLE);
// Empirically found: The notifications also work when the handle is immediately
// closed. Do it here to avoid having to close/reopen in lock message handling.
@ -339,20 +334,24 @@ QWindowsFileSystemWatcherEngine::Handle::Handle()
QWindowsFileSystemWatcherEngine::QWindowsFileSystemWatcherEngine(QObject *parent)
: QFileSystemWatcherEngine(parent)
#ifndef Q_OS_WINRT
, m_driveListener(new QWindowsRemovableDriveListener(this))
#endif
{
#ifndef Q_OS_WINRT
parent->setProperty("_q_driveListener",
QVariant::fromValue(static_cast<QObject *>(m_driveListener)));
QObject::connect(m_driveListener, &QWindowsRemovableDriveListener::driveLockForRemoval,
this, &QWindowsFileSystemWatcherEngine::driveLockForRemoval);
QObject::connect(m_driveListener, &QWindowsRemovableDriveListener::driveLockForRemovalFailed,
this, &QWindowsFileSystemWatcherEngine::driveLockForRemovalFailed);
QObject::connect(m_driveListener,
QOverload<const QString &>::of(&QWindowsRemovableDriveListener::driveRemoved),
this, &QWindowsFileSystemWatcherEngine::driveRemoved);
if (QAbstractEventDispatcher *eventDispatcher = QCoreApplication::eventDispatcher()) {
m_driveListener = new QWindowsRemovableDriveListener(this);
eventDispatcher->installNativeEventFilter(m_driveListener);
parent->setProperty("_q_driveListener",
QVariant::fromValue(static_cast<QObject *>(m_driveListener)));
QObject::connect(m_driveListener, &QWindowsRemovableDriveListener::driveLockForRemoval,
this, &QWindowsFileSystemWatcherEngine::driveLockForRemoval);
QObject::connect(m_driveListener, &QWindowsRemovableDriveListener::driveLockForRemovalFailed,
this, &QWindowsFileSystemWatcherEngine::driveLockForRemovalFailed);
QObject::connect(m_driveListener,
QOverload<const QString &>::of(&QWindowsRemovableDriveListener::driveRemoved),
this, &QWindowsFileSystemWatcherEngine::driveRemoved);
} else {
qWarning("QFileSystemWatcher: Removable drive notification will not work"
" if there is no QCoreApplication instance.");
}
#endif // !Q_OS_WINRT
}
@ -518,9 +517,11 @@ QStringList QWindowsFileSystemWatcherEngine::addPaths(const QStringList &paths,
}
#ifndef Q_OS_WINRT
for (const QString &path : paths) {
if (!p.contains(path))
m_driveListener->addPath(path);
if (Q_LIKELY(m_driveListener)) {
for (const QString &path : paths) {
if (!p.contains(path))
m_driveListener->addPath(path);
}
}
#endif // !Q_OS_WINRT
return p;

2
src/corelib/io/qfilesystemwatcher_win_p.h
View File

@ -129,7 +129,7 @@ signals:
private:
QList<QWindowsFileSystemWatcherEngineThread *> threads;
#ifndef Q_OS_WINRT
QWindowsRemovableDriveListener *m_driveListener;
QWindowsRemovableDriveListener *m_driveListener = nullptr;
#endif
};