Example #1
0
/*!
    Looks up the IP address(es) associated with host name \a name, and
    returns an ID for the lookup. When the result of the lookup is
    ready, the slot or signal \a member in \a receiver is called with
    a QHostInfo argument. The QHostInfo object can then be inspected
    to get the results of the lookup.

    The lookup is performed by a single function call, for example:

    \snippet doc/src/snippets/code/src_network_kernel_qhostinfo.cpp 2

    The implementation of the slot prints basic information about the
    addresses returned by the lookup, or reports an error if it failed:

    \snippet doc/src/snippets/code/src_network_kernel_qhostinfo.cpp 3

    If you pass a literal IP address to \a name instead of a host name,
    QHostInfo will search for the domain name for the IP (i.e., QHostInfo will
    perform a \e reverse lookup). On success, the resulting QHostInfo will
    contain both the resolved domain name and IP addresses for the host
    name. Example:

    \snippet doc/src/snippets/code/src_network_kernel_qhostinfo.cpp 4

    \sa abortHostLookup(), addresses(), error(), fromName()
*/
int QHostInfo::lookupHost(const QString &name, QObject *receiver,
                          const char *member)
{
#if defined QHOSTINFO_DEBUG
    qDebug("QHostInfo::lookupHost(\"%s\", %p, %s)",
           name.toLatin1().constData(), receiver, member ? member + 1 : 0);
#endif
    if (!QAbstractEventDispatcher::instance(QThread::currentThread())) {
        qWarning("QHostInfo::lookupHost() called with no event dispatcher");
        return -1;
    }

    qRegisterMetaType<QHostInfo>("QHostInfo");

#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
    QWindowsSockInit bust; // makes sure WSAStartup was callled
#endif

    QScopedPointer<QHostInfoResult> result(new QHostInfoResult);
    result.data()->autoDelete = false;
    QObject::connect(result.data(), SIGNAL(resultsReady(QHostInfo)),
                     receiver, member);
    int id = result.data()->lookupId = theIdCounter.fetchAndAddRelaxed(1);

    if (name.isEmpty()) {
        QHostInfo info(id);
        info.setError(QHostInfo::HostNotFound);
        info.setErrorString(QObject::tr("No host name given"));
        QMetaObject::invokeMethod(result.data(), "emitResultsReady", Qt::QueuedConnection,
                                  Q_ARG(QHostInfo, info));
        result.take()->autoDelete = true;
        return id;
    }

    QHostInfoAgent *agent = theAgent();
    agent->addHostName(name, result.take());

#if !defined QT_NO_THREAD
    if (!agent->isRunning())
        agent->start();
#else
//    if (!agent->isRunning())
	agent->run();
//    else
//	agent->wakeOne();
#endif
    return id;
}
/*!
    Looks up the IP address(es) associated with host name \a name, and
    returns an ID for the lookup. When the result of the lookup is
    ready, the slot or signal \a member in \a receiver is called with
    a QHostInfo argument. The QHostInfo object can then be inspected
    to get the results of the lookup.

    The lookup is performed by a single function call, for example:

    \snippet doc/src/snippets/code/src.network.kernel.qhostinfo.cpp 2

    The implementation of the slot prints basic information about the
    addresses returned by the lookup, or reports an error if it failed:

    \snippet doc/src/snippets/code/src.network.kernel.qhostinfo.cpp 3

    If you pass a literal IP address to \a name instead of a host name,
    QHostInfo will search for the domain name for the IP (i.e., QHostInfo will
    perform a \e reverse lookup). On success, the resulting QHostInfo will
    contain both the resolved domain name and IP addresses for the host
    name. Example:

    \snippet doc/src/snippets/code/src.network.kernel.qhostinfo.cpp 4

    \sa abortHostLookup(), addresses(), error(), fromName()
*/
int QHostInfo::lookupHost(const QString &name, QObject *receiver,
                          const char *member)
{
#if defined QHOSTINFO_DEBUG
    qDebug("QHostInfo::lookupHost(\"%s\", %p, %s)",
           name.toLatin1().constData(), receiver, member ? member + 1 : 0);
#endif
    if (!QAbstractEventDispatcher::instance(QThread::currentThread())) {
        qWarning("QHostInfo::lookupHost() called with no event dispatcher");
        return -1;
    }

    qRegisterMetaType<QHostInfo>("QHostInfo");

#if defined(Q_OS_WIN32) || defined(Q_OS_WINCE)
    QWindowsSockInit bust; // makes sure WSAStartup was callled
#endif

    // Support for IDNA by first splitting the name into labels, then
    // running the punycode decoder on each part, then merging
    // together before passing the name to the lookup agent.
    QString lookup = QString::fromLatin1(QUrl::toAce(name));

    QHostInfoAgent *agent = theAgent();

    QHostInfoResult *result = new QHostInfoResult;
    QObject::connect(result, SIGNAL(resultsReady(QHostInfo)),
                     receiver, member);
    int id = result->lookupId = theIdCounter.fetchAndAddRelaxed(1);
    agent->addHostName(lookup, result);

#if !defined QT_NO_THREAD
    if (!agent->isRunning())
        agent->start();
#else
//    if (!agent->isRunning())
	agent->run();
//    else
//	agent->wakeOne();
#endif
    return id;
}
/*!
    Aborts the host lookup with the ID \a id, as returned by lookupHost().

    \sa lookupHost(), lookupId()
*/
void QHostInfo::abortHostLookup(int id)
{
    QHostInfoAgent *agent = theAgent();
    agent->abortLookup(id);
}