自学教程：C++ updateTimeout函数代码示例

QGeoPositionInfoSourceWinCE::QGeoPositionInfoSourceWinCE(QObject *parent)    : QGeoPositionInfoSource(parent){    QGeoInfoValidator *validator = new QGeoPositionInfoValidator();    // The QGeoInfoThreadWinCE instance takes ownership of the validator.    infoThread = new QGeoInfoThreadWinCE(validator, true, this);    infoThread->start();    // QGeoInfoThreadWinCE takes care of registering GPS_POSITION as a metatype.    connect(infoThread, SIGNAL(dataUpdated(GPS_POSITION)), this, SLOT(dataUpdated(GPS_POSITION)));    connect(infoThread, SIGNAL(updateTimeout()), this, SIGNAL(updateTimeout()));}

void TestQGeoPositionInfoSource::removeSlotForRequestTimeout(){    CHECK_SOURCE_VALID;    bool i = connect(m_source, SIGNAL(updateTimeout()), this, SLOT(test_slot1()));    QVERIFY(i == true);    i = connect(m_source, SIGNAL(updateTimeout()), this, SLOT(test_slot2()));    QVERIFY(i == true);    i = disconnect(m_source, SIGNAL(updateTimeout()), this, SLOT(test_slot1()));    QVERIFY(i == true);    m_source->requestUpdate(-1);    QTRY_VERIFY_WITH_TIMEOUT((m_testSlot2Called == true), 1000);}

void tst_QNmeaPositionInfoSource::requestUpdate_after_start(){    QNmeaPositionInfoSource source(m_mode);    QNmeaPositionInfoSourceProxyFactory factory;    QNmeaPositionInfoSourceProxy *proxy = static_cast<QNmeaPositionInfoSourceProxy*>(factory.createProxy(&source));    QSignalSpy spyUpdate(proxy->source(), SIGNAL(positionUpdated(QGeoPositionInfo)));    QSignalSpy spyTimeout(proxy->source(), SIGNAL(updateTimeout()));    // Start updates with 500ms interval and requestUpdate() with 100ms    // timeout. Feed an update, and it should be emitted immediately due to    // the requestUpdate(). The update should not be emitted again after that    // (i.e. the startUpdates() interval should not cause it to be re-emitted).    QDateTime dt = QDateTime::currentDateTime().toUTC();    proxy->source()->setUpdateInterval(500);    proxy->source()->startUpdates();    proxy->source()->requestUpdate(100);    proxy->feedUpdate(dt);    QTRY_COMPARE(spyUpdate.count(), 1);    QCOMPARE(spyUpdate[0][0].value<QGeoPositionInfo>().timestamp(), dt);    QCOMPARE(spyTimeout.count(), 0);    spyUpdate.clear();    // Update has been emitted for requestUpdate(), shouldn't be emitted for startUpdates()    QTRY_COMPARE_WITH_TIMEOUT(spyUpdate.count(), 0, 1000);}

/*!    /internal*/void QDeclarativePositionSource::socketConnected(){#ifdef QDECLARATIVE_POSITION_DEBUG    qDebug() << "Socket connected: " << m_nmeaSocket->peerName();#endif    PositioningMethods previousPositioningMethods = supportedPositioningMethods();    // The current position source needs to be deleted    // because QNmeaPositionInfoSource can be bound only to a one file.    delete m_nmeaFile;    m_nmeaFile = 0;    delete m_positionSource;    m_positionSource = new QNmeaPositionInfoSource(QNmeaPositionInfoSource::RealTimeMode);    (qobject_cast<QNmeaPositionInfoSource *>(m_positionSource))->setDevice(m_nmeaSocket);    connect(m_positionSource, &QNmeaPositionInfoSource::positionUpdated,            this, &QDeclarativePositionSource::positionUpdateReceived);    connect(m_positionSource, SIGNAL(error(QGeoPositionInfoSource::Error)),            this, SLOT(sourceErrorReceived(QGeoPositionInfoSource::Error)));    connect(m_positionSource, SIGNAL(updateTimeout()),            this, SLOT(updateTimeoutReceived()));    setPosition(m_positionSource->lastKnownPosition());    if (m_active && !m_singleUpdate) {        // Keep on updating even though source changed        QTimer::singleShot(0, this, SLOT(start()));    }    if (previousPositioningMethods != supportedPositioningMethods())        emit supportedPositioningMethodsChanged();}

FoursquareVenueSelectionPage::FoursquareVenueSelectionPage(QGraphicsItem *parent)	: SelectionPage(parent),	  m_geosource(QGeoPositionInfoSource::createDefaultSource(this)),	  m_model(new FoursquareVenueSelectionPageListModel(this)),	  m_storage(FoursquareAuthStorage::storage()){	if (m_geosource == NULL) {		mDebug(__func__) << "Cannot set up geoposition source. ";	} else {		mDebug(__func__) << "Starting geoposition lookup. ";		connect(m_geosource, 			SIGNAL(positionUpdated(const QGeoPositionInfo &)),			this, 			SLOT(positionUpdated(const QGeoPositionInfo &)));		connect(m_geosource, 			SIGNAL(updateTimeout()),			this, 			SLOT(positionUpdateTimeout()));		m_geosource->startUpdates();	}	connect(m_model, 		SIGNAL(ready(enum FoursquareVenueSearch::SearchStatus)), 		this, 		SLOT(itemsReady(enum FoursquareVenueSearch::SearchStatus)));	connect(this, SIGNAL(created()), 		this, SLOT(activate()),		Qt::QueuedConnection);}

static void submitSACK(Connection *conn, const uint32_t ackn) {	SgmBuffElem *ackedelem = NULL;	Segment sgm;	long double sampleRTT;	if ((ackedelem = findSgmBuffAckn(&(conn->sndsgmbuff), ackn))) {		setSgmBuffElemStatus(ackedelem, RUSP_YACK);		sgm = ackedelem->segment;		DBGPRINT(RUSP_DEBUG, "SACKED: %u", sgm.hdr.seqn);		if (sgm.hdr.seqn == getWindowBase(&(conn->sndwnd))) {			sampleRTT = getSgmBuffElemElapsed(ackedelem);			while (conn->sndsgmbuff.head) {				if (getSgmBuffElemStatus(conn->sndsgmbuff.head) != RUSP_YACK)					break;				sgm = conn->sndsgmbuff.head->segment;				removeSgmBuff(&(conn->sndsgmbuff), conn->sndsgmbuff.head);				slideWindow(&(conn->sndwnd), (sgm.hdr.ctrl & RUSP_FIN)?1:sgm.hdr.plds);				DBGPRINT(RUSP_DEBUG, "SND (WND): base:%u nxt:%u end:%u SNDUSRBUFF:%zu SNDSGMBUFF:%ld", getWindowBase(&(conn->sndwnd)), getWindowNext(&(conn->sndwnd)), getWindowEnd(&(conn->sndwnd)), getStrBuffSize(&(conn->sndusrbuff)), getSgmBuffSize(&(conn->sndsgmbuff)));			}			updateTimeout(&(conn->timeout), sampleRTT);		}	}}

LocationTracker::LocationTracker()	: m_latitude(0)	, m_longitude(0){	//Creo la source para geoposici
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