/*!
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
\note There is no guarantee on the order the signals will be emitted
if you start multiple requests with lookupHost().
\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");
int id = theIdCounter.fetchAndAddRelaxed(1); // generate unique ID
if (name.isEmpty()) {
if (!receiver)
return -1;
QHostInfo hostInfo(id);
hostInfo.setError(QHostInfo::HostNotFound);
hostInfo.setErrorString(QCoreApplication::translate("QHostInfo", "No host name given"));
QScopedPointer<QHostInfoResult> result(new QHostInfoResult);
QObject::connect(result.data(), SIGNAL(resultsReady(QHostInfo)),
receiver, member, Qt::QueuedConnection);
result.data()->emitResultsReady(hostInfo);
return id;
}
QHostInfoLookupManager *manager = theHostInfoLookupManager();
if (manager) {
// the application is still alive
if (manager->cache.isEnabled()) {
// check cache first
bool valid = false;
QHostInfo info = manager->cache.get(name, &valid);
if (valid) {
if (!receiver)
return -1;
info.setLookupId(id);
QHostInfoResult result;
QObject::connect(&result, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
result.emitResultsReady(info);
return id;
}
}
// cache is not enabled or it was not in the cache, do normal lookup
QHostInfoRunnable* runnable = new QHostInfoRunnable(name, id);
if (receiver)
QObject::connect(&runnable->resultEmitter, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
manager->scheduleLookup(runnable);
}
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
\note There is no guarantee on the order the signals will be emitted
if you start multiple requests with lookupHost().
\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");
int id = theIdCounter.fetchAndAddRelaxed(1); // generate unique ID
if (name.isEmpty()) {
QHostInfo hostInfo(id);
hostInfo.setError(QHostInfo::HostNotFound);
hostInfo.setErrorString(QCoreApplication::translate("QHostInfo", "No host name given"));
QScopedPointer<QHostInfoResult> result(new QHostInfoResult);
QObject::connect(result.data(), SIGNAL(resultsReady(QHostInfo)),
receiver, member, Qt::QueuedConnection);
result.data()->emitResultsReady(hostInfo);
return id;
}
#ifndef Q_OS_SYMBIAN
QHostInfoLookupManager *manager = theHostInfoLookupManager();
if (manager) {
// the application is still alive
if (manager->cache.isEnabled()) {
// check cache first
bool valid = false;
QHostInfo info = manager->cache.get(name, &valid);
if (valid) {
info.setLookupId(id);
QHostInfoResult result;
QObject::connect(&result, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
result.emitResultsReady(info);
return id;
}
}
// cache is not enabled or it was not in the cache, do normal lookup
QHostInfoRunnable* runnable = new QHostInfoRunnable(name, id);
QObject::connect(&runnable->resultEmitter, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
manager->scheduleLookup(runnable);
}
#else
QSymbianHostInfoLookupManager *manager = theHostInfoLookupManager();
if (manager) {
// the application is still alive
if (manager->cache.isEnabled()) {
// check cache first
bool valid = false;
QHostInfo info = manager->cache.get(name, &valid);
if (valid) {
info.setLookupId(id);
QHostInfoResult result;
QObject::connect(&result, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
result.emitResultsReady(info);
return id;
}
}
// cache is not enabled or it was not in the cache, do normal lookup
#ifndef QT_NO_BEARERMANAGEMENT
QSharedPointer<QNetworkSession> networkSession;
QVariant v(receiver->property("_q_networksession"));
if (v.isValid())
networkSession = qvariant_cast< QSharedPointer<QNetworkSession> >(v);
#endif
QSymbianHostResolver *symbianResolver = 0;
QT_TRAP_THROWING(symbianResolver = new QSymbianHostResolver(name, id, networkSession));
QObject::connect(&symbianResolver->resultEmitter, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
manager->scheduleLookup(symbianResolver);
}
#endif
return id;
}
