Getting a page content with Qt - c++

Question

I am trying to get the content of a HTTP request into a QString variable with Qt and C++
QNetworkAccessManager networkManager;
QUrl url("https://someurl.test.com/this-actually-exists");
QNetworkRequest request;
request.setUrl(url);
QNetworkReply* currentReply = networkManager.get(request); // GET
QString reply = QTextCodec::codecForMib(1015)->toUnicode(currentReply->readAll());
Still, the variable reply seems to stay empty. Obviously, I misunderstand the documentation. How do I get this to perform?

Answer 1

You can use two different ways even the synchronous or asynchronous ways to do this. The asynchronous way is :
connect (&networkManager , SIGNAL(finished(QNetworkReply*)) ,this, SLOT(done(QNetworkReply*)));
networkManager.get(request);
And you should read the contents from the returned reply in the slot connected to finished signal in the following way :
void net::done(QNetworkReply * reply)
{
if (reply->error() == QNetworkReply::NoError)
{
data = QString(reply->readAll ());
}
else
{
data = QString(reply->errorString ());
}
}
The synchronous way is like :
QNetworkReply *reply = networkManager.get(request);
QEventLoop loop;
connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
connect(reply, SIGNAL(error(QNetworkReply::NetworkError)), &loop, SLOT(quit()));
loop.exec();
QByteArray bts = reply->readAll();
QString str(bts);
Here you use an event loop to wait until the reply is finished and then read the available bytes and get the string.

Answer 2

I need to assume you're running an application with an event-loop in place? If not, then it's a bit harder...
If so, replace your last line that builds the reply QString:
connect(currentReply, SIGNAL(finished()), this, SLOT(gotAReply()));
Then you'll have to define another method in your class as a slot that gets triggered as soon as that reply got filled:
void gotAReply()
{
QNetworkReply *reply = qobject_cast<QNetworkReply*>(QObject::sender());
if (reply)
{
if (reply->error() == QNetworkReply::NoError)
{
QString replyText( reply->readAll() );
}
reply->deleteLater();
}
}
Don't forget: for Signals and Slot to work your class declaration must contain the Q_OBJECT macro.