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c++qtconsole-applicationsignals-slots

Use signals and slots in console application?

In my project, I need to download a 1.5MB file from a server. I was able to achieve this in my GUI application like this:

QNetworkAccessManager* m_NetworkMngr = new QNetworkAccessManager(this);
    QNetworkReply *reply = m_NetworkMngr->get(QNetworkRequest(QUrl("someurl.com")));
    QEventLoop loop;
    connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
    loop.exec();
    QUrl aUrl("someurl.com");
    QFileInfo fileInfo=aUrl.path();

    QFile file(aPathInClient+"\\"+fileInfo.fileName());//aPathInClient is predefined
    file.open(QIODevice::WriteOnly);
    file.write(reply->readAll());
    delete reply;

I am getting the following error:

'connect' function does not take four arguments.

How can I modify the signals and slots to work in my console application?

Solution

  • My guess is that your code is correct with regards to establishing signal/slot connection, however compiler seems to be confused because of the connect() function name and cannot resolve it properly: whether it is QObject::connect() that takes at least 4 arguments, or it is another function with the same name, but different signature. I would suggest to try to explicitly tell compiler which function to use, i.e.:

    QObject::connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));