/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtCore module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the either Technology Preview License Agreement or the ** Beta Release License Agreement. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you are unsure which license is appropriate for your use, please ** contact the sales department at http://www.qtsoftware.com/contact. ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qcoreapplication.h" #include "qcoreapplication_p.h" #include "qabstracteventdispatcher.h" #include "qcoreevent.h" #include "qeventloop.h" #include "qcorecmdlineargs_p.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef Q_OS_UNIX # if !defined(QT_NO_GLIB) # include "qeventdispatcher_glib_p.h" # endif # include "qeventdispatcher_unix_p.h" #endif #ifdef Q_OS_WIN # include "qeventdispatcher_win_p.h" #endif #ifdef Q_OS_MAC # include "qcore_mac_p.h" #endif #include #ifdef Q_OS_UNIX # include #endif QT_BEGIN_NAMESPACE #if defined(Q_WS_WIN) || defined(Q_WS_MAC) extern QString qAppFileName(); #endif #if !defined(Q_OS_WIN) #ifdef Q_OS_MAC QString QCoreApplicationPrivate::macMenuBarName() { QString bundleName; CFTypeRef string = CFBundleGetValueForInfoDictionaryKey(CFBundleGetMainBundle(), CFSTR("CFBundleName")); if (string) bundleName = QCFString::toQString(static_cast(string)); return bundleName; } #endif QString QCoreApplicationPrivate::appName() const { static QString applName; #ifdef Q_OS_MAC applName = macMenuBarName(); #endif if (applName.isEmpty() && argv[0]) { char *p = strrchr(argv[0], '/'); applName = QString::fromLocal8Bit(p ? p + 1 : argv[0]); } return applName; } #endif bool QCoreApplicationPrivate::checkInstance(const char *function) { bool b = (QCoreApplication::self != 0); if (!b) qWarning("QApplication::%s: Please instantiate the QApplication object first", function); return b; } // Support for introspection QSignalSpyCallbackSet Q_CORE_EXPORT qt_signal_spy_callback_set = { 0, 0, 0, 0 }; void qt_register_signal_spy_callbacks(const QSignalSpyCallbackSet &callback_set) { qt_signal_spy_callback_set = callback_set; } extern "C" void Q_CORE_EXPORT qt_startup_hook() { } typedef QList QVFuncList; Q_GLOBAL_STATIC(QVFuncList, postRList) void qAddPostRoutine(QtCleanUpFunction p) { QVFuncList *list = postRList(); if (!list) return; list->prepend(p); } void qRemovePostRoutine(QtCleanUpFunction p) { QVFuncList *list = postRList(); if (!list) return; list->removeAll(p); } void Q_CORE_EXPORT qt_call_post_routines() { QVFuncList *list = postRList(); if (!list) return; while (!list->isEmpty()) (list->takeFirst())(); } // app starting up if false bool QCoreApplicationPrivate::is_app_running = false; // app closing down if true bool QCoreApplicationPrivate::is_app_closing = false; // initialized in qcoreapplication and in qtextstream autotest when setlocale is called. Q_CORE_EXPORT bool qt_locale_initialized = false; Q_CORE_EXPORT uint qGlobalPostedEventsCount() { QThreadData *currentThreadData = QThreadData::current(); return currentThreadData->postEventList.size() - currentThreadData->postEventList.startOffset; } void qt_set_current_thread_to_main_thread() { QCoreApplicationPrivate::theMainThread = QThread::currentThread(); } QCoreApplication *QCoreApplication::self = 0; QAbstractEventDispatcher *QCoreApplicationPrivate::eventDispatcher = 0; uint QCoreApplicationPrivate::attribs; #ifdef Q_OS_UNIX Qt::HANDLE qt_application_thread_id = 0; #endif struct QCoreApplicationData { QCoreApplicationData() { #ifndef QT_NO_LIBRARY app_libpaths = 0; #endif } ~QCoreApplicationData() { #ifndef QT_NO_LIBRARY delete app_libpaths; #endif // cleanup the QAdoptedThread created for the main() thread if (QCoreApplicationPrivate::theMainThread) { QThreadData *data = QThreadData::get2(QCoreApplicationPrivate::theMainThread); QCoreApplicationPrivate::theMainThread = 0; data->deref(); // deletes the data and the adopted thread } } QString orgName, orgDomain, application; QString applicationVersion; #ifndef QT_NO_LIBRARY QStringList *app_libpaths; #endif }; Q_GLOBAL_STATIC(QCoreApplicationData, coreappdata) QCoreApplicationPrivate::QCoreApplicationPrivate(int &aargc, char **aargv) : QObjectPrivate(), argc(aargc), argv(aargv), application_type(0), eventFilter(0), in_exec(false), aboutToQuitEmitted(false) { static const char *const empty = ""; if (argc == 0 || argv == 0) { argc = 0; argv = (char **)∅ // ouch! careful with QCoreApplication::argv()! } QCoreApplicationPrivate::is_app_closing = false; #ifdef Q_OS_UNIX qt_application_thread_id = QThread::currentThreadId(); #endif // note: this call to QThread::currentThread() may end up setting theMainThread! if (QThread::currentThread() != theMainThread) qWarning("WARNING: QApplication was not created in the main() thread."); } QCoreApplicationPrivate::~QCoreApplicationPrivate() { #ifndef QT_NO_THREAD void *data = &threadData->tls; QThreadStorageData::finish((void **)data); #endif // need to clear the state of the mainData, just in case a new QCoreApplication comes along. QMutexLocker locker(&threadData->postEventList.mutex); for (int i = 0; i < threadData->postEventList.size(); ++i) { const QPostEvent &pe = threadData->postEventList.at(i); if (pe.event) { --pe.receiver->d_func()->postedEvents; pe.event->posted = false; delete pe.event; } } threadData->postEventList.clear(); threadData->postEventList.recursion = 0; threadData->quitNow = false; } void QCoreApplicationPrivate::createEventDispatcher() { Q_Q(QCoreApplication); #if defined(Q_OS_UNIX) # if !defined(QT_NO_GLIB) if (qgetenv("QT_NO_GLIB").isEmpty() && QEventDispatcherGlib::versionSupported()) eventDispatcher = new QEventDispatcherGlib(q); else # endif eventDispatcher = new QEventDispatcherUNIX(q); #elif defined(Q_OS_WIN) eventDispatcher = new QEventDispatcherWin32(q); #else # error "QEventDispatcher not yet ported to this platform" #endif } QThread *QCoreApplicationPrivate::theMainThread = 0; QThread *QCoreApplicationPrivate::mainThread() { Q_ASSERT(theMainThread != 0); return theMainThread; } #if !defined (QT_NO_DEBUG) || defined (QT_MAC_FRAMEWORK_BUILD) void QCoreApplicationPrivate::checkReceiverThread(QObject *receiver) { QThread *currentThread = QThread::currentThread(); QThread *thr = receiver->thread(); Q_ASSERT_X(currentThread == thr || !thr, "QCoreApplication::sendEvent", QString::fromLatin1("Cannot send events to objects owned by a different thread. " "Current thread %1. Receiver '%2' (of type '%3') was created in thread %4") .arg(QString::number((quintptr) currentThread, 16)) .arg(receiver->objectName()) .arg(QLatin1String(receiver->metaObject()->className())) .arg(QString::number((quintptr) thr, 16)) .toLocal8Bit().data()); Q_UNUSED(currentThread); Q_UNUSED(thr); } #endif void QCoreApplicationPrivate::appendApplicationPathToLibraryPaths() { #if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) QStringList *app_libpaths = coreappdata()->app_libpaths; Q_ASSERT(app_libpaths); QString app_location( QCoreApplication::applicationFilePath() ); app_location.truncate(app_location.lastIndexOf(QLatin1Char('/'))); app_location = QDir(app_location).canonicalPath(); if (app_location != QLibraryInfo::location(QLibraryInfo::PluginsPath) && QFile::exists(app_location) && !app_libpaths->contains(app_location)) app_libpaths->append(app_location); #endif } QString qAppName() { if (!QCoreApplicationPrivate::checkInstance("qAppName")) return QString(); return QCoreApplication::instance()->d_func()->appName(); } /*! \class QCoreApplication \brief The QCoreApplication class provides an event loop for console Qt applications. \ingroup application \mainclass This class is used by non-GUI applications to provide their event loop. For non-GUI application that uses Qt, there should be exactly one QCoreApplication object. For GUI applications, see QApplication. QCoreApplication contains the main event loop, where all events from the operating system (e.g., timer and network events) and other sources are processed and dispatched. It also handles the application's initialization and finalization, as well as system-wide and application-wide settings. The command line arguments which QCoreApplication's constructor should be called with are accessible using arguments(). The event loop is started with a call to exec(). Long running operations can call processEvents() to keep the application responsive. Some Qt classes, such as QString, can be used without a QCoreApplication object. However, in general, we recommend that you create a QCoreApplication or a QApplication object in your \c main() function as early as possible. The application will enter the event loop when exec() is called. exit() will not return until the event loop exits, e.g., when quit() is called. An application has an applicationDirPath() and an applicationFilePath(). Translation files can be added or removed using installTranslator() and removeTranslator(). Application strings can be translated using translate(). The QObject::tr() and QObject::trUtf8() functions are implemented in terms of translate(). The class provides a quit() slot and an aboutToQuit() signal. Several static convenience functions are also provided. The QCoreApplication object is available from instance(). Events can be sent or posted using sendEvent(), postEvent(), and sendPostedEvents(). Pending events can be removed with removePostedEvents() or flushed with flush(). Library paths (see QLibrary) can be retrieved with libraryPaths() and manipulated by setLibraryPaths(), addLibraryPath(), and removeLibraryPath(). On Unix/Linux Qt is configured to use the system local settings by default. This can cause a conflict when using POSIX functions, for instance, when converting between data types such as floats and strings, since the notation may differ between locales. To get around this problem call the POSIX function setlocale(LC_NUMERIC,"C") right after initializing QApplication or QCoreApplication to reset the locale that is used for number formatting to "C"-locale. \sa QApplication, QAbstractEventDispatcher, QEventLoop, {Semaphores Example}, {Wait Conditions Example} */ /*! \fn static QCoreApplication *QCoreApplication::instance() Returns a pointer to the application's QCoreApplication (or QApplication) instance. If no instance has been allocated, \c null is returned. */ /*!\internal */ QCoreApplication::QCoreApplication(QCoreApplicationPrivate &p) : QObject(p, 0) { init(); // note: it is the subclasses' job to call // QCoreApplicationPrivate::eventDispatcher->startingUp(); } /*! Flushes the platform specific event queues. If you are doing graphical changes inside a loop that does not return to the event loop on asynchronous window systems like X11 or double buffered window systems like Mac OS X, and you want to visualize these changes immediately (e.g. Splash Screens), call this function. \sa sendPostedEvents() */ void QCoreApplication::flush() { if (self && self->d_func()->eventDispatcher) self->d_func()->eventDispatcher->flush(); } /*! Constructs a Qt kernel application. Kernel applications are applications without a graphical user interface. These type of applications are used at the console or as server processes. The \a argc and \a argv arguments are processed by the application, and made available in a more convenient form by the arguments() function. \warning The data referred to by \a argc and \a argv must stay valid for the entire lifetime of the QCoreApplication object. In addition, \a argc must be greater than zero and \a argv must contain at least one valid character string. */ QCoreApplication::QCoreApplication(int &argc, char **argv) : QObject(*new QCoreApplicationPrivate(argc, argv)) { init(); QCoreApplicationPrivate::eventDispatcher->startingUp(); } extern void set_winapp_name(); // ### move to QCoreApplicationPrivate constructor? void QCoreApplication::init() { Q_D(QCoreApplication); #ifdef Q_OS_UNIX setlocale(LC_ALL, ""); // use correct char set mapping qt_locale_initialized = true; #endif #ifdef Q_WS_WIN // Get the application name/instance if qWinMain() was not invoked set_winapp_name(); #endif Q_ASSERT_X(!self, "QCoreApplication", "there should be only one application object"); QCoreApplication::self = this; #ifndef QT_NO_THREAD QThread::initialize(); #endif // use the event dispatcher created by the app programmer (if any) if (!QCoreApplicationPrivate::eventDispatcher) QCoreApplicationPrivate::eventDispatcher = d->threadData->eventDispatcher; // otherwise we create one if (!QCoreApplicationPrivate::eventDispatcher) d->createEventDispatcher(); Q_ASSERT(QCoreApplicationPrivate::eventDispatcher != 0); if (!QCoreApplicationPrivate::eventDispatcher->parent()) QCoreApplicationPrivate::eventDispatcher->moveToThread(d->threadData->thread); d->threadData->eventDispatcher = QCoreApplicationPrivate::eventDispatcher; #if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) if (!coreappdata()->app_libpaths) { // make sure that library paths is initialized libraryPaths(); } else { d->appendApplicationPathToLibraryPaths(); } #endif #if defined(Q_OS_UNIX) && !(defined(QT_NO_PROCESS)) // Make sure the process manager thread object is created in the main // thread. QProcessPrivate::initializeProcessManager(); #endif #ifdef QT_EVAL extern void qt_core_eval_init(uint); qt_core_eval_init(d->application_type); #endif qt_startup_hook(); } /*! Destroys the QCoreApplication object. */ QCoreApplication::~QCoreApplication() { qt_call_post_routines(); self = 0; QCoreApplicationPrivate::is_app_closing = true; QCoreApplicationPrivate::is_app_running = false; #if !defined(QT_NO_THREAD) #if !defined(QT_NO_CONCURRENT) // Synchronize and stop the global thread pool threads. QThreadPool::globalInstance()->waitForDone(); #endif QThread::cleanup(); #endif d_func()->threadData->eventDispatcher = 0; if (QCoreApplicationPrivate::eventDispatcher) QCoreApplicationPrivate::eventDispatcher->closingDown(); QCoreApplicationPrivate::eventDispatcher = 0; #ifndef QT_NO_LIBRARY delete coreappdata()->app_libpaths; coreappdata()->app_libpaths = 0; #endif } /*! Sets the attribute \a attribute if \a on is true; otherwise clears the attribute. One of the attributes that can be set with this method is Qt::AA_ImmediateWidgetCreation. It tells Qt to create toplevel windows immediately. Normally, resources for widgets are allocated on demand to improve efficiency and minimize resource usage. Therefore, if it is important to minimize resource consumption, do not set this attribute. \sa testAttribute() */ void QCoreApplication::setAttribute(Qt::ApplicationAttribute attribute, bool on) { if (on) QCoreApplicationPrivate::attribs |= 1 << attribute; else QCoreApplicationPrivate::attribs &= ~(1 << attribute); #ifdef Q_OS_MAC // Turn on the no native menubar here, since we used to // do this implicitly. We DO NOT flip it off if someone sets // it to false. // Ideally, we'd have magic that would be something along the lines of // "follow MacPluginApplication" unless explicitly set. // Considering this attribute isn't only at the beginning // it's unlikely it will ever be a problem, but I want // to have the behavior documented here. if (attribute == Qt::AA_MacPluginApplication && on && !testAttribute(Qt::AA_DontUseNativeMenuBar)) { setAttribute(Qt::AA_DontUseNativeMenuBar, true); } #endif } /*! Returns true if attribute \a attribute is set; otherwise returns false. \sa setAttribute() */ bool QCoreApplication::testAttribute(Qt::ApplicationAttribute attribute) { return QCoreApplicationPrivate::testAttribute(attribute); } /*! \internal This function is here to make it possible for Qt extensions to hook into event notification without subclassing QApplication */ bool QCoreApplication::notifyInternal(QObject *receiver, QEvent *event) { // Make it possible for Qt Jambi and QSA to hook into events even // though QApplication is subclassed... bool result = false; void *cbdata[] = { receiver, event, &result }; if (QInternal::activateCallbacks(QInternal::EventNotifyCallback, cbdata)) { return result; } // Qt enforces the rule that events can only be sent to objects in // the current thread, so receiver->d_func()->threadData is // equivalent to QThreadData::current(), just without the function // call overhead. QObjectPrivate *d = receiver->d_func(); QThreadData *threadData = d->threadData; ++threadData->loopLevel; #ifdef QT_JAMBI_BUILD int deleteWatch = 0; int *oldDeleteWatch = QObjectPrivate::setDeleteWatch(d, &deleteWatch); bool inEvent = d->inEventHandler; d->inEventHandler = true; #endif #if defined(QT_NO_EXCEPTIONS) bool returnValue = notify(receiver, event); #else bool returnValue; try { returnValue = notify(receiver, event); } catch(...) { --threadData->loopLevel; throw; } #endif #ifdef QT_JAMBI_BUILD // Restore the previous state if the object was not deleted.. if (!deleteWatch) { d->inEventHandler = inEvent; } QObjectPrivate::resetDeleteWatch(d, oldDeleteWatch, deleteWatch); #endif --threadData->loopLevel; return returnValue; } /*! Sends \a event to \a receiver: \a {receiver}->event(\a event). Returns the value that is returned from the receiver's event handler. Note that this function is called for all events sent to any object in any thread. For certain types of events (e.g. mouse and key events), the event will be propagated to the receiver's parent and so on up to the top-level object if the receiver is not interested in the event (i.e., it returns false). There are five different ways that events can be processed; reimplementing this virtual function is just one of them. All five approaches are listed below: \list 1 \i Reimplementing paintEvent(), mousePressEvent() and so on. This is the commonest, easiest and least powerful way. \i Reimplementing this function. This is very powerful, providing complete control; but only one subclass can be active at a time. \i Installing an event filter on QCoreApplication::instance(). Such an event filter is able to process all events for all widgets, so it's just as powerful as reimplementing notify(); furthermore, it's possible to have more than one application-global event filter. Global event filters even see mouse events for \l{QWidget::isEnabled()}{disabled widgets}. Note that application event filters are only called for objects that live in the main thread. \i Reimplementing QObject::event() (as QWidget does). If you do this you get Tab key presses, and you get to see the events before any widget-specific event filters. \i Installing an event filter on the object. Such an event filter gets all the events, including Tab and Shift+Tab key press events, as long as they do not change the focus widget. \endlist \sa QObject::event(), installEventFilter() */ bool QCoreApplication::notify(QObject *receiver, QEvent *event) { Q_D(QCoreApplication); // no events are delivered after ~QCoreApplication() has started if (QCoreApplicationPrivate::is_app_closing) return true; if (receiver == 0) { // serious error qWarning("QCoreApplication::notify: Unexpected null receiver"); return true; } #ifndef QT_NO_DEBUG d->checkReceiverThread(receiver); #endif #ifdef QT3_SUPPORT if (event->type() == QEvent::ChildRemoved && !receiver->d_func()->pendingChildInsertedEvents.isEmpty()) receiver->d_func()->removePendingChildInsertedEvents(static_cast(event)->child()); #endif // QT3_SUPPORT return receiver->isWidgetType() ? false : d->notify_helper(receiver, event); } bool QCoreApplicationPrivate::sendThroughApplicationEventFilters(QObject *receiver, QEvent *event) { if (receiver->d_func()->threadData == this->threadData) { // application event filters are only called for objects in the GUI thread for (int i = 0; i < eventFilters.size(); ++i) { register QObject *obj = eventFilters.at(i); if (!obj) continue; if (obj->d_func()->threadData != threadData) { qWarning("QCoreApplication: Application event filter cannot be in a different thread."); continue; } if (obj->eventFilter(receiver, event)) return true; } } return false; } bool QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject *receiver, QEvent *event) { Q_Q(QCoreApplication); if (receiver != q) { for (int i = 0; i < receiver->d_func()->eventFilters.size(); ++i) { register QObject *obj = receiver->d_func()->eventFilters.at(i); if (!obj) continue; if (obj->d_func()->threadData != receiver->d_func()->threadData) { qWarning("QCoreApplication: Object event filter cannot be in a different thread."); continue; } if (obj->eventFilter(receiver, event)) return true; } } return false; } /*!\internal Helper function called by notify() */ bool QCoreApplicationPrivate::notify_helper(QObject *receiver, QEvent * event) { // send to all application event filters if (sendThroughApplicationEventFilters(receiver, event)) return true; // send to all receiver event filters if (sendThroughObjectEventFilters(receiver, event)) return true; // deliver the event return receiver->event(event); } /*! Returns true if an application object has not been created yet; otherwise returns false. \sa closingDown() */ bool QCoreApplication::startingUp() { return !QCoreApplicationPrivate::is_app_running; } /*! Returns true if the application objects are being destroyed; otherwise returns false. \sa startingUp() */ bool QCoreApplication::closingDown() { return QCoreApplicationPrivate::is_app_closing; } /*! Processes all pending events for the calling thread according to the specified \a flags until there are no more events to process. You can call this function occasionally when your program is busy performing a long operation (e.g. copying a file). In event you are running a local loop which calls this function continuously, without an event loop, the \l{QEvent::DeferredDelete}{DeferredDelete} events will not be processed. This can affect the behaviour of widgets, e.g. QToolTip, that rely on \l{QEvent::DeferredDelete}{DeferredDelete} events to function properly. An alternative would be to call \l{QCoreApplication::sendPostedEvents()}{sendPostedEvents()} from within that local loop. Calling this function processes events only for the calling thread. \threadsafe \sa exec(), QTimer, QEventLoop::processEvents(), flush(), sendPostedEvents() */ void QCoreApplication::processEvents(QEventLoop::ProcessEventsFlags flags) { QThreadData *data = QThreadData::current(); if (!data->eventDispatcher) return; if (flags & QEventLoop::DeferredDeletion) QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete); data->eventDispatcher->processEvents(flags); } /*! \overload processEvents() Processes pending events for the calling thread for \a maxtime milliseconds or until there are no more events to process, whichever is shorter. You can call this function occasionally when you program is busy doing a long operation (e.g. copying a file). Calling this function processes events only for the calling thread. \threadsafe \sa exec(), QTimer, QEventLoop::processEvents() */ void QCoreApplication::processEvents(QEventLoop::ProcessEventsFlags flags, int maxtime) { QThreadData *data = QThreadData::current(); if (!data->eventDispatcher) return; QTime start; start.start(); if (flags & QEventLoop::DeferredDeletion) QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete); while (data->eventDispatcher->processEvents(flags & ~QEventLoop::WaitForMoreEvents)) { if (start.elapsed() > maxtime) break; if (flags & QEventLoop::DeferredDeletion) QCoreApplication::sendPostedEvents(0, QEvent::DeferredDelete); } } /***************************************************************************** Main event loop wrappers *****************************************************************************/ /*! Enters the main event loop and waits until exit() is called. Returns the value that was set to exit() (which is 0 if exit() is called via quit()). It is necessary to call this function to start event handling. The main event loop receives events from the window system and dispatches these to the application widgets. To make your application perform idle processing (i.e. executing a special function whenever there are no pending events), use a QTimer with 0 timeout. More advanced idle processing schemes can be achieved using processEvents(). We recommend that you connect clean-up code to the \l{QCoreApplication::}{aboutToQuit()} signal, instead of putting it in your application's \c{main()} function because on some platforms the QCoreApplication::exec() call may not return. For example, on Windows when the user logs off, the system terminates the process after Qt closes all top-level windows. Hence, there is no guarantee that the application will have time to exit its event loop and execute code at the end of the \c{main()} function after the QCoreApplication::exec() call. \sa quit(), exit(), processEvents(), QApplication::exec() */ int QCoreApplication::exec() { if (!QCoreApplicationPrivate::checkInstance("exec")) return -1; QThreadData *threadData = self->d_func()->threadData; if (threadData != QThreadData::current()) { qWarning("%s::exec: Must be called from the main thread", self->metaObject()->className()); return -1; } if (!threadData->eventLoops.isEmpty()) { qWarning("QCoreApplication::exec: The event loop is already running"); return -1; } threadData->quitNow = false; QEventLoop eventLoop; self->d_func()->in_exec = true; self->d_func()->aboutToQuitEmitted = false; int returnCode = eventLoop.exec(); threadData->quitNow = false; if (self) { self->d_func()->in_exec = false; if (!self->d_func()->aboutToQuitEmitted) emit self->aboutToQuit(); self->d_func()->aboutToQuitEmitted = true; sendPostedEvents(0, QEvent::DeferredDelete); } return returnCode; } /*! Tells the application to exit with a return code. After this function has been called, the application leaves the main event loop and returns from the call to exec(). The exec() function returns \a returnCode. If the event loop is not running, this function does nothing. By convention, a \a returnCode of 0 means success, and any non-zero value indicates an error. Note that unlike the C library function of the same name, this function \e does return to the caller -- it is event processing that stops. \sa quit(), exec() */ void QCoreApplication::exit(int returnCode) { if (!self) return; QThreadData *data = self->d_func()->threadData; data->quitNow = true; for (int i = 0; i < data->eventLoops.size(); ++i) { QEventLoop *eventLoop = data->eventLoops.at(i); eventLoop->exit(returnCode); } } /***************************************************************************** QCoreApplication management of posted events *****************************************************************************/ /*! \fn bool QCoreApplication::sendEvent(QObject *receiver, QEvent *event) Sends event \a event directly to receiver \a receiver, using the notify() function. Returns the value that was returned from the event handler. The event is \e not deleted when the event has been sent. The normal approach is to create the event on the stack, for example: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 0 \sa postEvent(), notify() */ /*! Adds the event \a event, with the object \a receiver as the receiver of the event, to an event queue and returns immediately. The event must be allocated on the heap since the post event queue will take ownership of the event and delete it once it has been posted. It is \e {not safe} to modify or delete the event after it has been posted. When control returns to the main event loop, all events that are stored in the queue will be sent using the notify() function. Events are processed in the order posted. For more control over the processing order, use the postEvent() overload below, which takes a priority argument. This function posts all event with a Qt::NormalEventPriority. \threadsafe \sa sendEvent(), notify(), sendPostedEvents() */ void QCoreApplication::postEvent(QObject *receiver, QEvent *event) { postEvent(receiver, event, Qt::NormalEventPriority); } /*! \overload postEvent() \since 4.3 Adds the event \a event, with the object \a receiver as the receiver of the event, to an event queue and returns immediately. The event must be allocated on the heap since the post event queue will take ownership of the event and delete it once it has been posted. It is \e {not safe} to modify or delete the event after it has been posted. When control returns to the main event loop, all events that are stored in the queue will be sent using the notify() function. Events are sorted in descending \a priority order, i.e. events with a high \a priority are queued before events with a lower \a priority. The \a priority can be any integer value, i.e. between INT_MAX and INT_MIN, inclusive; see Qt::EventPriority for more details. Events with equal \a priority will be processed in the order posted. \threadsafe \sa sendEvent(), notify(), sendPostedEvents(), Qt::EventPriority */ void QCoreApplication::postEvent(QObject *receiver, QEvent *event, int priority) { if (receiver == 0) { qWarning("QCoreApplication::postEvent: Unexpected null receiver"); delete event; return; } QThreadData * volatile * pdata = &receiver->d_func()->threadData; QThreadData *data = *pdata; if (!data) { // posting during destruction? just delete the event to prevent a leak delete event; return; } // lock the post event mutex data->postEventList.mutex.lock(); // if object has moved to another thread, follow it while (data != *pdata) { data->postEventList.mutex.unlock(); data = *pdata; if (!data) { // posting during destruction? just delete the event to prevent a leak delete event; return; } data->postEventList.mutex.lock(); } // if this is one of the compressible events, do compression if (receiver->d_func()->postedEvents && self && self->compressEvent(event, receiver, &data->postEventList)) { data->postEventList.mutex.unlock(); return; } event->posted = true; ++receiver->d_func()->postedEvents; if (event->type() == QEvent::DeferredDelete && data == QThreadData::current()) { // remember the current running eventloop for DeferredDelete // events posted in the receiver's thread event->d = reinterpret_cast(quintptr(data->loopLevel)); } if (data->postEventList.isEmpty() || data->postEventList.last().priority >= priority) { // optimization: we can simply append if the last event in // the queue has higher or equal priority data->postEventList.append(QPostEvent(receiver, event, priority)); } else { // insert event in descending priority order, using upper // bound for a given priority (to ensure proper ordering // of events with the same priority) QPostEventList::iterator begin = data->postEventList.begin() + data->postEventList.insertionOffset, end = data->postEventList.end(); QPostEventList::iterator at = qUpperBound(begin, end, priority); data->postEventList.insert(at, QPostEvent(receiver, event, priority)); } data->canWait = false; data->postEventList.mutex.unlock(); if (data->eventDispatcher) data->eventDispatcher->wakeUp(); } /*! \internal Returns true if \a event was compressed away (possibly deleted) and should not be added to the list. */ bool QCoreApplication::compressEvent(QEvent *event, QObject *receiver, QPostEventList *postedEvents) { #ifdef Q_WS_WIN Q_ASSERT(event); Q_ASSERT(receiver); Q_ASSERT(postedEvents); // compress posted timers to this object. if (event->type() == QEvent::Timer && receiver->d_func()->postedEvents > 0) { int timerId = ((QTimerEvent *) event)->timerId(); for (int i=0; isize(); ++i) { const QPostEvent &e = postedEvents->at(i); if (e.receiver == receiver && e.event && e.event->type() == QEvent::Timer && ((QTimerEvent *) e.event)->timerId() == timerId) { delete event; return true; } } } else #endif if ((event->type() == QEvent::DeferredDelete || event->type() == QEvent::Quit) && receiver->d_func()->postedEvents > 0) { for (int i = 0; i < postedEvents->size(); ++i) { const QPostEvent &cur = postedEvents->at(i); if (cur.receiver != receiver || cur.event == 0 || cur.event->type() != event->type()) continue; // found an event for this receiver delete event; return true; } } return false; } /*! \fn void QCoreApplication::sendPostedEvents() \overload sendPostedEvents() Dispatches all posted events, i.e. empties the event queue. */ /*! Immediately dispatches all events which have been previously queued with QCoreApplication::postEvent() and which are for the object \a receiver and have the event type \a event_type. Events from the window system are \e not dispatched by this function, but by processEvents(). If \a receiver is null, the events of \a event_type are sent for all objects. If \a event_type is 0, all the events are sent for \a receiver. \note This method must be called from the same thread as its QObject parameter, \a receiver. \sa flush(), postEvent() */ void QCoreApplication::sendPostedEvents(QObject *receiver, int event_type) { QThreadData *data = QThreadData::current(); QCoreApplicationPrivate::sendPostedEvents(receiver, event_type, data); } void QCoreApplicationPrivate::sendPostedEvents(QObject *receiver, int event_type, QThreadData *data) { if (event_type == -1) { // we were called by an obsolete event dispatcher. event_type = 0; } if (receiver && receiver->d_func()->threadData != data) { qWarning("QCoreApplication::sendPostedEvents: Cannot send " "posted events for objects in another thread"); return; } ++data->postEventList.recursion; #ifdef QT3_SUPPORT if (event_type == QEvent::ChildInserted) { if (receiver) { // optimize sendPostedEvents(w, QEvent::ChildInserted) calls away receiver->d_func()->sendPendingChildInsertedEvents(); --data->postEventList.recursion; return; } // ChildInserted events are sent in response to *Request event_type = QEvent::ChildInsertedRequest; } #endif QMutexLocker locker(&data->postEventList.mutex); // by default, we assume that the event dispatcher can go to sleep after // processing all events. if any new events are posted while we send // events, canWait will be set to false. data->canWait = (data->postEventList.size() == 0); if (data->postEventList.size() == 0 || (receiver && !receiver->d_func()->postedEvents)) { --data->postEventList.recursion; return; } data->canWait = true; // okay. here is the tricky loop. be careful about optimizing // this, it looks the way it does for good reasons. int startOffset = data->postEventList.startOffset; int &i = (!event_type && !receiver) ? data->postEventList.startOffset : startOffset; data->postEventList.insertionOffset = data->postEventList.size(); while (i < data->postEventList.size()) { // avoid live-lock if (i >= data->postEventList.insertionOffset) break; const QPostEvent &pe = data->postEventList.at(i); ++i; if (!pe.event) continue; if ((receiver && receiver != pe.receiver) || (event_type && event_type != pe.event->type())) { data->canWait = false; continue; } if (pe.event->type() == QEvent::DeferredDelete) { // DeferredDelete events are only sent when we are explicitly asked to // (s.a. QEvent::DeferredDelete), and then only if the event loop that // posted the event has returned. const bool allowDeferredDelete = (quintptr(pe.event->d) > unsigned(data->loopLevel) || (!quintptr(pe.event->d) && data->loopLevel > 0) || (event_type == QEvent::DeferredDelete && quintptr(pe.event->d) == unsigned(data->loopLevel))); if (!allowDeferredDelete) { // cannot send deferred delete if (!event_type && !receiver) { // don't lose the event data->postEventList.append(pe); const_cast(pe).event = 0; } continue; } } // first, we diddle the event so that we can deliver // it, and that no one will try to touch it later. pe.event->posted = false; QEvent * e = pe.event; QObject * r = pe.receiver; --r->d_func()->postedEvents; Q_ASSERT(r->d_func()->postedEvents >= 0); // next, update the data structure so that we're ready // for the next event. const_cast(pe).event = 0; locker.unlock(); // after all that work, it's time to deliver the event. #ifdef QT_NO_EXCEPTIONS QCoreApplication::sendEvent(r, e); #else try { QCoreApplication::sendEvent(r, e); } catch (...) { delete e; locker.relock(); // since we were interrupted, we need another pass to make sure we clean everything up data->canWait = false; // uglehack: copied from below --data->postEventList.recursion; if (!data->postEventList.recursion && !data->canWait && data->eventDispatcher) data->eventDispatcher->wakeUp(); throw; // rethrow } #endif delete e; locker.relock(); // careful when adding anything below this point - the // sendEvent() call might invalidate any invariants this // function depends on. } --data->postEventList.recursion; if (!data->postEventList.recursion && !data->canWait && data->eventDispatcher) data->eventDispatcher->wakeUp(); // clear the global list, i.e. remove everything that was // delivered. if (!event_type && !receiver && data->postEventList.startOffset >= 0) { const QPostEventList::iterator it = data->postEventList.begin(); data->postEventList.erase(it, it + data->postEventList.startOffset); data->postEventList.insertionOffset -= data->postEventList.startOffset; Q_ASSERT(data->postEventList.insertionOffset >= 0); data->postEventList.startOffset = 0; } } /*! Removes all events posted using postEvent() for \a receiver. The events are \e not dispatched, instead they are removed from the queue. You should never need to call this function. If you do call it, be aware that killing events may cause \a receiver to break one or more invariants. \threadsafe */ void QCoreApplication::removePostedEvents(QObject *receiver) { removePostedEvents(receiver, 0); } /*! \overload removePostedEvents() \since 4.3 Removes all events of the given \a eventType that were posted using postEvent() for \a receiver. The events are \e not dispatched, instead they are removed from the queue. You should never need to call this function. If you do call it, be aware that killing events may cause \a receiver to break one or more invariants. If \a receiver is null, the events of \a eventType are removed for all objects. If \a eventType is 0, all the events are removed for \a receiver. \threadsafe */ void QCoreApplication::removePostedEvents(QObject *receiver, int eventType) { #ifdef QT3_SUPPORT if (eventType == QEvent::ChildInserted) eventType = QEvent::ChildInsertedRequest; #endif QThreadData *data = receiver ? receiver->d_func()->threadData : QThreadData::current(); QMutexLocker locker(&data->postEventList.mutex); // the QObject destructor calls this function directly. this can // happen while the event loop is in the middle of posting events, // and when we get here, we may not have any more posted events // for this object. if (receiver && !receiver->d_func()->postedEvents) return; QCoreApplicationPrivate::removePostedEvents_unlocked(receiver, eventType, data); } void QCoreApplicationPrivate::removePostedEvents_unlocked(QObject *receiver, int eventType, QThreadData *data) { int n = data->postEventList.size(); int j = 0; for (int i = 0; i < n; ++i) { const QPostEvent &pe = data->postEventList.at(i); if ((!receiver || pe.receiver == receiver) && (pe.event && (eventType == 0 || pe.event->type() == eventType))) { --pe.receiver->d_func()->postedEvents; #ifdef QT3_SUPPORT if (pe.event->type() == QEvent::ChildInsertedRequest) pe.receiver->d_func()->removePendingChildInsertedEvents(0); #endif pe.event->posted = false; delete pe.event; const_cast(pe).event = 0; } else if (!data->postEventList.recursion) { if (i != j) data->postEventList.swap(i, j); ++j; } } #ifdef QT_DEBUG if (receiver && eventType == 0) { Q_ASSERT(!receiver->d_func()->postedEvents); } #endif if (!data->postEventList.recursion) { // truncate list data->postEventList.erase(data->postEventList.begin() + j, data->postEventList.end()); } } /*! Removes \a event from the queue of posted events, and emits a warning message if appropriate. \warning This function can be \e really slow. Avoid using it, if possible. \threadsafe */ void QCoreApplicationPrivate::removePostedEvent(QEvent * event) { if (!event || !event->posted) return; QThreadData *data = QThreadData::current(); QMutexLocker locker(&data->postEventList.mutex); if (data->postEventList.size() == 0) { #if defined(QT_DEBUG) qDebug("QCoreApplication::removePostedEvent: Internal error: %p %d is posted", (void*)event, event->type()); return; #endif } for (int i = 0; i < data->postEventList.size(); ++i) { const QPostEvent & pe = data->postEventList.at(i); if (pe.event == event) { #ifndef QT_NO_DEBUG qWarning("QCoreApplication::removePostedEvent: Event of type %d deleted while posted to %s %s", event->type(), pe.receiver->metaObject()->className(), pe.receiver->objectName().toLocal8Bit().data()); #endif --pe.receiver->d_func()->postedEvents; pe.event->posted = false; delete pe.event; const_cast(pe).event = 0; return; } } } /*!\reimp */ bool QCoreApplication::event(QEvent *e) { if (e->type() == QEvent::Quit) { quit(); return true; } return QObject::event(e); } /*! \enum QCoreApplication::Encoding This enum type defines the 8-bit encoding of character string arguments to translate(): \value CodecForTr The encoding specified by QTextCodec::codecForTr() (Latin-1 if none has been set). \value UnicodeUTF8 UTF-8. \value DefaultCodec (Obsolete) Use CodecForTr instead. \sa QObject::tr(), QObject::trUtf8(), QString::fromUtf8() */ /*! Tells the application to exit with return code 0 (success). Equivalent to calling QCoreApplication::exit(0). It's common to connect the QApplication::lastWindowClosed() signal to quit(), and you also often connect e.g. QAbstractButton::clicked() or signals in QAction, QMenu, or QMenuBar to it. Example: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 1 \sa exit(), aboutToQuit(), QApplication::lastWindowClosed() */ void QCoreApplication::quit() { exit(0); } /*! \fn void QCoreApplication::aboutToQuit() This signal is emitted when the application is about to quit the main event loop, e.g. when the event loop level drops to zero. This may happen either after a call to quit() from inside the application or when the users shuts down the entire desktop session. The signal is particularly useful if your application has to do some last-second cleanup. Note that no user interaction is possible in this state. \sa quit() */ #ifndef QT_NO_TRANSLATION /*! Adds the translation file \a translationFile to the list of translation files to be used for translations. Multiple translation files can be installed. Translations are searched for in the reverse order in which they were installed, so the most recently installed translation file is searched first and the first translation file installed is searched last. The search stops as soon as a translation containing a matching string is found. Installing or removing a QTranslator, or changing an installed QTranslator generates a \l{QEvent::LanguageChange}{LanguageChange} event for the QCoreApplication instance. A QApplication instance will propagate the event to all toplevel windows, where a reimplementation of changeEvent can re-translate the user interface by passing user-visible strings via the tr() function to the respective property setters. User-interface classes generated by \l{Qt Designer} provide a \c retranslateUi() function that can be called. \sa removeTranslator() translate() QTranslator::load() {Dynamic Translation} */ void QCoreApplication::installTranslator(QTranslator *translationFile) { if (!translationFile) return; if (!QCoreApplicationPrivate::checkInstance("installTranslator")) return; QCoreApplicationPrivate *d = self->d_func(); d->translators.prepend(translationFile); #ifndef QT_NO_TRANSLATION_BUILDER if (translationFile->isEmpty()) return; #endif QEvent ev(QEvent::LanguageChange); QCoreApplication::sendEvent(self, &ev); } /*! Removes the translation file \a translationFile from the list of translation files used by this application. (It does not delete the translation file from the file system.) \sa installTranslator() translate(), QObject::tr() */ void QCoreApplication::removeTranslator(QTranslator *translationFile) { if (!translationFile) return; if (!QCoreApplicationPrivate::checkInstance("removeTranslator")) return; QCoreApplicationPrivate *d = self->d_func(); if (d->translators.removeAll(translationFile) && !self->closingDown()) { QEvent ev(QEvent::LanguageChange); QCoreApplication::sendEvent(self, &ev); } } /*! \overload translate() */ QString QCoreApplication::translate(const char *context, const char *sourceText, const char *disambiguation, Encoding encoding) { return translate(context, sourceText, disambiguation, encoding, -1); } static void replacePercentN(QString *result, int n) { if (n >= 0) { int percentPos = 0; int len = 0; while ((percentPos = result->indexOf(QLatin1Char('%'), percentPos + len)) != -1) { len = 1; QString fmt; if (result->at(percentPos + len) == QLatin1Char('L')) { ++len; fmt = QLatin1String("%L1"); } else { fmt = QLatin1String("%1"); } if (result->at(percentPos + len) == QLatin1Char('n')) { fmt = fmt.arg(n); ++len; result->replace(percentPos, len, fmt); len = fmt.length(); } } } } /*! \reentrant \since 4.5 Returns the translation text for \a sourceText, by querying the installed translation files. The translation files are searched from the most recently installed file back to the first installed file. QObject::tr() and QObject::trUtf8() provide this functionality more conveniently. \a context is typically a class name (e.g., "MyDialog") and \a sourceText is either English text or a short identifying text. \a disambiguation is an identifying string, for when the same \a sourceText is used in different roles within the same context. By default, it is null. See the \l QTranslator and \l QObject::tr() documentation for more information about contexts, disambiguations and comments. \a encoding indicates the 8-bit encoding of character strings. \a n is used in conjunction with \c %n to support plural forms. See QObject::tr() for details. If none of the translation files contain a translation for \a sourceText in \a context, this function returns a QString equivalent of \a sourceText. The encoding of \a sourceText is specified by \e encoding; it defaults to CodecForTr. This function is not virtual. You can use alternative translation techniques by subclassing \l QTranslator. \warning This method is reentrant only if all translators are installed \e before calling this method. Installing or removing translators while performing translations is not supported. Doing so will most likely result in crashes or other undesirable behavior. \sa QObject::tr() installTranslator() QTextCodec::codecForTr() */ QString QCoreApplication::translate(const char *context, const char *sourceText, const char *disambiguation, Encoding encoding, int n) { QString result; if (!sourceText) return result; if (self && !self->d_func()->translators.isEmpty()) { QList::ConstIterator it; QTranslator *translationFile; for (it = self->d_func()->translators.constBegin(); it != self->d_func()->translators.constEnd(); ++it) { translationFile = *it; result = translationFile->translate(context, sourceText, disambiguation, n); if (!result.isEmpty()) break; } } if (result.isEmpty()) { #ifdef QT_NO_TEXTCODEC Q_UNUSED(encoding) #else if (encoding == UnicodeUTF8) result = QString::fromUtf8(sourceText); else if (QTextCodec::codecForTr() != 0) result = QTextCodec::codecForTr()->toUnicode(sourceText); else #endif result = QString::fromLatin1(sourceText); } replacePercentN(&result, n); return result; } bool QCoreApplicationPrivate::isTranslatorInstalled(QTranslator *translator) { return QCoreApplication::self && QCoreApplication::self->d_func()->translators.contains(translator); } #endif //QT_NO_TRANSLATE /*! Returns the directory that contains the application executable. For example, if you have installed Qt in the \c{C:\Trolltech\Qt} directory, and you run the \c{regexp} example, this function will return "C:/Trolltech/Qt/examples/tools/regexp". On Mac OS X this will point to the directory actually containing the executable, which may be inside of an application bundle (if the application is bundled). \warning On Linux, this function will try to get the path from the \c {/proc} file system. If that fails, it assumes that \c {argv[0]} contains the absolute file name of the executable. The function also assumes that the current directory has not been changed by the application. \sa applicationFilePath() */ QString QCoreApplication::applicationDirPath() { if (!self) { qWarning("QCoreApplication::applicationDirPath: Please instantiate the QApplication object first"); return QString(); } QCoreApplicationPrivate *d = self->d_func(); if (d->cachedApplicationDirPath.isNull()) d->cachedApplicationDirPath = QFileInfo(applicationFilePath()).path(); return d->cachedApplicationDirPath; } /*! Returns the file path of the application executable. For example, if you have installed Qt in the \c{/usr/local/qt} directory, and you run the \c{regexp} example, this function will return "/usr/local/qt/examples/tools/regexp/regexp". \warning On Linux, this function will try to get the path from the \c {/proc} file system. If that fails, it assumes that \c {argv[0]} contains the absolute file name of the executable. The function also assumes that the current directory has not been changed by the application. \sa applicationDirPath() */ QString QCoreApplication::applicationFilePath() { if (!self) { qWarning("QCoreApplication::applicationFilePath: Please instantiate the QApplication object first"); return QString(); } QCoreApplicationPrivate *d = self->d_func(); if (!d->cachedApplicationFilePath.isNull()) return d->cachedApplicationFilePath; #if defined( Q_WS_WIN ) QFileInfo filePath; QT_WA({ wchar_t module_name[MAX_PATH+1]; GetModuleFileNameW(0, module_name, MAX_PATH); module_name[MAX_PATH] = 0; filePath = QString::fromUtf16((ushort *)module_name); }, { char module_name[MAX_PATH+1]; GetModuleFileNameA(0, module_name, MAX_PATH); module_name[MAX_PATH] = 0; filePath = QString::fromLocal8Bit(module_name); }); d->cachedApplicationFilePath = filePath.filePath(); return d->cachedApplicationFilePath; #elif defined(Q_WS_MAC) QString qAppFileName_str = qAppFileName(); if(!qAppFileName_str.isEmpty()) { QFileInfo fi(qAppFileName_str); d->cachedApplicationFilePath = fi.exists() ? fi.canonicalFilePath() : QString(); return d->cachedApplicationFilePath; } #endif #if defined( Q_OS_UNIX ) # ifdef Q_OS_LINUX // Try looking for a /proc//exe symlink first which points to // the absolute path of the executable QFileInfo pfi(QString::fromLatin1("/proc/%1/exe").arg(getpid())); if (pfi.exists() && pfi.isSymLink()) { d->cachedApplicationFilePath = pfi.canonicalFilePath(); return d->cachedApplicationFilePath; } # endif QString argv0 = QFile::decodeName(QByteArray(argv()[0])); QString absPath; if (!argv0.isEmpty() && argv0.at(0) == QLatin1Char('/')) { /* If argv0 starts with a slash, it is already an absolute file path. */ absPath = argv0; } else if (argv0.contains(QLatin1Char('/'))) { /* If argv0 contains one or more slashes, it is a file path relative to the current directory. */ absPath = QDir::current().absoluteFilePath(argv0); } else { /* Otherwise, the file path has to be determined using the PATH environment variable. */ QByteArray pEnv = qgetenv("PATH"); QDir currentDir = QDir::current(); QStringList paths = QString::fromLocal8Bit(pEnv.constData()).split(QLatin1Char(':')); for (QStringList::const_iterator p = paths.constBegin(); p != paths.constEnd(); ++p) { if ((*p).isEmpty()) continue; QString candidate = currentDir.absoluteFilePath(*p + QLatin1Char('/') + argv0); QFileInfo candidate_fi(candidate); if (candidate_fi.exists() && !candidate_fi.isDir()) { absPath = candidate; break; } } } absPath = QDir::cleanPath(absPath); QFileInfo fi(absPath); d->cachedApplicationFilePath = fi.exists() ? fi.canonicalFilePath() : QString(); return d->cachedApplicationFilePath; #endif } /*! \since 4.4 Returns the current process ID for the application. */ qint64 QCoreApplication::applicationPid() { #if defined(Q_OS_WIN32) || defined(Q_OS_WINCE) return GetCurrentProcessId(); #else // UNIX return getpid(); #endif } /*! \obsolete Use arguments().size() instead. */ int QCoreApplication::argc() { if (!self) { qWarning("QCoreApplication::argc: Please instantiate the QApplication object first"); return 0; } return self->d_func()->argc; } /*! \obsolete Use arguments() instead. */ char **QCoreApplication::argv() { if (!self) { qWarning("QCoreApplication::argv: Please instantiate the QApplication object first"); return 0; } return self->d_func()->argv; } /*! \since 4.1 Returns the list of command-line arguments. Usually arguments().at(0) is the program name, arguments().at(1) is the first argument, and arguments().last() is the last argument. See the note below about Windows. Calling this function is slow - you should store the result in a variable when parsing the command line. \warning On Unix, this list is built from the argc and argv parameters passed to the constructor in the main() function. The string-data in argv is interpreted using QString::fromLocal8Bit(); hence it is not possible to pass i.e. Japanese command line arguments on a system that runs in a latin1 locale. Most modern Unix systems do not have this limitation, as they are Unicode based. On NT-based Windows, this limitation does not apply either. On Windows, the arguments() are not built from the contents of argv/argc, as the content does not support Unicode. Instead, the arguments() are constructed from the return value of \l{http://msdn2.microsoft.com/en-us/library/ms683156(VS.85).aspx}{GetCommandLine()}. As a result of this, the string given by arguments().at(0) might not be the program name on Windows, depending on how the application was started. \sa applicationFilePath() */ QStringList QCoreApplication::arguments() { QStringList list; if (!self) { qWarning("QCoreApplication::arguments: Please instantiate the QApplication object first"); return list; } #ifdef Q_OS_WIN QString cmdline = QT_WA_INLINE(QString::fromUtf16((unsigned short *)GetCommandLineW()), QString::fromLocal8Bit(GetCommandLineA())); #if defined(Q_OS_WINCE) wchar_t tempFilename[MAX_PATH+1]; if (GetModuleFileNameW(0, tempFilename, MAX_PATH)) { tempFilename[MAX_PATH] = 0; cmdline.prepend(QLatin1Char('\"') + QString::fromUtf16((unsigned short *)tempFilename) + QLatin1String("\" ")); } #endif // Q_OS_WINCE list = qWinCmdArgs(cmdline); if (self->d_func()->application_type) { // GUI app? Skip known - see qapplication.cpp QStringList stripped; for (int a = 0; a < list.count(); ++a) { QString arg = list.at(a); QByteArray l1arg = arg.toLatin1(); if (l1arg == "-qdevel" || l1arg == "-qdebug" || l1arg == "-reverse" || l1arg == "-stylesheet" || l1arg == "-widgetcount") ; else if (l1arg.startsWith("-style=")) ; else if (l1arg == "-style" || l1arg == "-session" || l1arg == "-graphicssystem") ++a; else stripped += arg; } list = stripped; } #else const int ac = self->d_func()->argc; char ** const av = self->d_func()->argv; for (int a = 0; a < ac; ++a) { list << QString::fromLocal8Bit(av[a]); } #endif return list; } /*! \property QCoreApplication::organizationName \brief the name of the organization that wrote this application The value is used by the QSettings class when it is constructed using the empty constructor. This saves having to repeat this information each time a QSettings object is created. On Mac, QSettings uses organizationDomain() as the organization if it's not an empty string; otherwise it uses organizationName(). On all other platforms, QSettings uses organizationName() as the organization. \sa organizationDomain applicationName */ void QCoreApplication::setOrganizationName(const QString &orgName) { coreappdata()->orgName = orgName; } QString QCoreApplication::organizationName() { return coreappdata()->orgName; } /*! \property QCoreApplication::organizationDomain \brief the Internet domain of the organization that wrote this application The value is used by the QSettings class when it is constructed using the empty constructor. This saves having to repeat this information each time a QSettings object is created. On Mac, QSettings uses organizationDomain() as the organization if it's not an empty string; otherwise it uses organizationName(). On all other platforms, QSettings uses organizationName() as the organization. \sa organizationName applicationName applicationVersion */ void QCoreApplication::setOrganizationDomain(const QString &orgDomain) { coreappdata()->orgDomain = orgDomain; } QString QCoreApplication::organizationDomain() { return coreappdata()->orgDomain; } /*! \property QCoreApplication::applicationName \brief the name of this application The value is used by the QSettings class when it is constructed using the empty constructor. This saves having to repeat this information each time a QSettings object is created. \sa organizationName organizationDomain applicationVersion */ void QCoreApplication::setApplicationName(const QString &application) { coreappdata()->application = application; } QString QCoreApplication::applicationName() { return coreappdata()->application; } /*! \property QCoreApplication::applicationVersion \since 4.4 \brief the version of this application \sa applicationName organizationName organizationDomain */ void QCoreApplication::setApplicationVersion(const QString &version) { coreappdata()->applicationVersion = version; } QString QCoreApplication::applicationVersion() { return coreappdata()->applicationVersion; } #if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) Q_GLOBAL_STATIC_WITH_ARGS(QMutex, libraryPathMutex, (QMutex::Recursive)) /*! Returns a list of paths that the application will search when dynamically loading libraries. Qt provides default library paths, but they can also be set using a \l{Using qt.conf}{qt.conf} file. Paths specified in this file will override default values. This list will include the installation directory for plugins if it exists (the default installation directory for plugins is \c INSTALL/plugins, where \c INSTALL is the directory where Qt was installed). The directory of the application executable (NOT the working directory) is always added, as well as the colon separated entries of the QT_PLUGIN_PATH environment variable. If you want to iterate over the list, you can use the \l foreach pseudo-keyword: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 2 \sa setLibraryPaths(), addLibraryPath(), removeLibraryPath(), QLibrary, {How to Create Qt Plugins} */ QStringList QCoreApplication::libraryPaths() { QMutexLocker locker(libraryPathMutex()); if (!coreappdata()->app_libpaths) { QStringList *app_libpaths = coreappdata()->app_libpaths = new QStringList; QString installPathPlugins = QLibraryInfo::location(QLibraryInfo::PluginsPath); if (QFile::exists(installPathPlugins)) { // Make sure we convert from backslashes to slashes. installPathPlugins = QDir(installPathPlugins).canonicalPath(); if (!app_libpaths->contains(installPathPlugins)) app_libpaths->append(installPathPlugins); } // If QCoreApplication is not yet instantiated, // make sure we add the application path when we construct the QCoreApplication if (self) self->d_func()->appendApplicationPathToLibraryPaths(); const QByteArray libPathEnv = qgetenv("QT_PLUGIN_PATH"); if (!libPathEnv.isEmpty()) { #ifdef Q_OS_WIN QLatin1Char pathSep(';'); #else QLatin1Char pathSep(':'); #endif QStringList paths = QString::fromLatin1(libPathEnv).split(pathSep, QString::SkipEmptyParts); for (QStringList::const_iterator it = paths.constBegin(); it != paths.constEnd(); ++it) { QString canonicalPath = QDir(*it).canonicalPath(); if (!canonicalPath.isEmpty() && !app_libpaths->contains(canonicalPath)) { app_libpaths->append(canonicalPath); } } } } return *(coreappdata()->app_libpaths); } /*! Sets the list of directories to search when loading libraries to \a paths. All existing paths will be deleted and the path list will consist of the paths given in \a paths. \sa libraryPaths(), addLibraryPath(), removeLibraryPath(), QLibrary */ void QCoreApplication::setLibraryPaths(const QStringList &paths) { #if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) QMutexLocker locker(libraryPathMutex()); if (!coreappdata()->app_libpaths) coreappdata()->app_libpaths = new QStringList; *(coreappdata()->app_libpaths) = paths; QFactoryLoader::refreshAll(); #endif } /*! Prepends \a path to the beginning of the library path list, ensuring that it is searched for libraries first. If \a path is empty or already in the path list, the path list is not changed. The default path list consists of a single entry, the installation directory for plugins. The default installation directory for plugins is \c INSTALL/plugins, where \c INSTALL is the directory where Qt was installed. \sa removeLibraryPath(), libraryPaths(), setLibraryPaths() */ void QCoreApplication::addLibraryPath(const QString &path) { #if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) if (path.isEmpty()) return; QMutexLocker locker(libraryPathMutex()); // make sure that library paths is initialized libraryPaths(); QString canonicalPath = QDir(path).canonicalPath(); if (!canonicalPath.isEmpty() && !coreappdata()->app_libpaths->contains(canonicalPath)) { coreappdata()->app_libpaths->prepend(canonicalPath); QFactoryLoader::refreshAll(); } #endif } /*! Removes \a path from the library path list. If \a path is empty or not in the path list, the list is not changed. \sa addLibraryPath(), libraryPaths(), setLibraryPaths() */ void QCoreApplication::removeLibraryPath(const QString &path) { #if !defined(QT_NO_LIBRARY) && !defined(QT_NO_SETTINGS) if (path.isEmpty()) return; QMutexLocker locker(libraryPathMutex()); // make sure that library paths is initialized libraryPaths(); QString canonicalPath = QDir(path).canonicalPath(); coreappdata()->app_libpaths->removeAll(canonicalPath); QFactoryLoader::refreshAll(); #endif } #endif //QT_NO_LIBRARY /*! \typedef QCoreApplication::EventFilter A function with the following signature that can be used as an event filter: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 3 \sa setEventFilter() */ /*! \fn EventFilter QCoreApplication::setEventFilter(EventFilter filter) Sets the event filter \a filter. Returns a pointer to the filter function previously defined. The event filter is a function that is called for every message received in all threads. This does \e not include messages to objects that are not handled by Qt. The function can return true to stop the event to be processed by Qt, or false to continue with the standard event processing. Only one filter can be defined, but the filter can use the return value to call the previously set event filter. By default, no filter is set (i.e., the function returns 0). \sa installEventFilter() */ QCoreApplication::EventFilter QCoreApplication::setEventFilter(QCoreApplication::EventFilter filter) { Q_D(QCoreApplication); EventFilter old = d->eventFilter; d->eventFilter = filter; return old; } /*! Sends \a message through the event filter that was set by setEventFilter(). If no event filter has been set, this function returns false; otherwise, this function returns the result of the event filter function in the \a result parameter. \sa setEventFilter() */ bool QCoreApplication::filterEvent(void *message, long *result) { Q_D(QCoreApplication); if (result) *result = 0; if (d->eventFilter) return d->eventFilter(message, result); #ifdef Q_OS_WIN return winEventFilter(reinterpret_cast(message), result); #else return false; #endif } /*! This function returns true if there are pending events; otherwise returns false. Pending events can be either from the window system or posted events using postEvent(). \sa QAbstractEventDispatcher::hasPendingEvents() */ bool QCoreApplication::hasPendingEvents() { QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance(); if (eventDispatcher) return eventDispatcher->hasPendingEvents(); return false; } #ifdef QT3_SUPPORT /*! \fn void QCoreApplication::lock() In Qt 3, this function locked the Qt library mutex, allowing non-GUI threads to perform basic printing operations using QPainter. In Qt 4, this is no longer supported, since painting is only supported from within a paint event handler. This function does nothing. \sa QWidget::paintEvent() */ /*! \fn void QCoreApplication::unlock(bool wakeUpGui) In Qt 3, this function unlocked the Qt library mutex. The mutex allowed non-GUI threads to perform basic printing operations using QPainter. In Qt 4, this is no longer supported, since painting is only supported from within a paint event handler. This function does nothing. */ /*! \fn bool QCoreApplication::locked() This function does nothing. It is there to keep old code working. It always returns false. See lock() for details. */ /*! \fn bool QCoreApplication::tryLock() This function does nothing. It is there to keep old code working. It always returns false. See lock() for details. */ /*! \fn void QCoreApplication::processOneEvent() \obsolete Waits for an event to occur, processes it, then returns. This function is useful for adapting Qt to situations where the event processing must be grafted onto existing program loops. Using this function in new applications may be an indication of design problems. \sa processEvents(), exec(), QTimer */ /*! \obsolete This function enters the main event loop (recursively). Do not call it unless you really know what you are doing. */ int QCoreApplication::enter_loop() { if (!QCoreApplicationPrivate::checkInstance("enter_loop")) return -1; if (QThreadData::current() != self->d_func()->threadData) { qWarning("QCoreApplication::enter_loop: Must be called from the main thread"); return -1; } QEventLoop eventLoop; int returnCode = eventLoop.exec(); return returnCode; } /*! \obsolete This function exits from a recursive call to the main event loop. Do not call it unless you are an expert. */ void QCoreApplication::exit_loop() { if (!QCoreApplicationPrivate::checkInstance("exit_loop")) return; QThreadData *data = QThreadData::current(); if (data != self->d_func()->threadData) { qWarning("QCoreApplication::exit_loop: Must be called from the main thread"); return; } if (!data->eventLoops.isEmpty()) data->eventLoops.top()->exit(); } /*! \obsolete Returns the current loop level. */ int QCoreApplication::loopLevel() { if (!QCoreApplicationPrivate::checkInstance("loopLevel")) return -1; return self->d_func()->threadData->eventLoops.size(); } #endif /*! \fn void QCoreApplication::watchUnixSignal(int signal, bool watch) \internal */ /*! \fn void QCoreApplication::unixSignal(int number) \internal This signal is emitted whenever a Unix signal is received by the application. The Unix signal received is specified by its \a number. */ /*! \fn void qAddPostRoutine(QtCleanUpFunction ptr) \relates QCoreApplication Adds a global routine that will be called from the QApplication destructor. This function is normally used to add cleanup routines for program-wide functionality. The function specified by \a ptr should take no arguments and should return nothing. For example: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 4 Note that for an application- or module-wide cleanup, qAddPostRoutine() is often not suitable. For example, if the program is split into dynamically loaded modules, the relevant module may be unloaded long before the QApplication destructor is called. For modules and libraries, using a reference-counted initialization manager or Qt's parent-child deletion mechanism may be better. Here is an example of a private class that uses the parent-child mechanism to call a cleanup function at the right time: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 5 By selecting the right parent object, this can often be made to clean up the module's data at the right moment. */ /*! \macro Q_DECLARE_TR_FUNCTIONS(context) \relates QCoreApplication The Q_DECLARE_TR_FUNCTIONS() macro declares and implements two translation functions, \c tr() and \c trUtf8(), with these signatures: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 6 This macro is useful if you want to use QObject::tr() or QObject::trUtf8() in classes that don't inherit from QObject. Q_DECLARE_TR_FUNCTIONS() must appear at the very top of the class definition (before the first \c{public:} or \c{protected:}). For example: \snippet doc/src/snippets/code/src_corelib_kernel_qcoreapplication.cpp 7 The \a context parameter is normally the class name, but it can be any string. \sa Q_OBJECT, QObject::tr(), QObject::trUtf8() */ QT_END_NAMESPACE