Qt QNetworkAccessManager does not emit signals

The function CheckSite() is called with an url like http://example.com, it initializes a QNetworkAccessManager object and connect() slots and signals.

The manger->get() call seems work (it generates http traffic) but does not call the slot replyFinished() at the request end.

What's wrong开发者_运维问答 with this code?

#include <QtCore>
#include <QtNetwork>

class ClientHandler : public QObject
{
Q_OBJECT
  QNetworkAccessManager *manager;
private slots:
  void replyFinished(QNetworkReply *);
public:
  void CheckSite(QString url);
};

void ClientHandler::replyFinished(QNetworkReply *reply) { qDebug() << "DONE"; }

void ClientHandler::CheckSite(QString url) {
  QUrl qrl(url);
  manager = new QNetworkAccessManager(this);
  connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
  manager->get(QNetworkRequest(qrl));
}

Nothing. I wrapped it so it was fully functional and it works fine:

// placed in client.cpp
#include <QtDebug>
#include <QCoreApplication>

/* YOUR CODE */

int main(int argc, char *argv[])
{
        QCoreApplication app(argc, argv);
        ClientHandler handler;
        handler.CheckSite("www.google.com");
        return app.exec();

}

#include "client.moc"

It output "DONE" as expected. Maybe the site you're checking really isn't returning? Maybe it needs authentication or is producing ssl errors?

What code do you have around that? Do you spin an event loop somewhere? e.g. qapp.exec() ?