Qt QSSlSocket - SEGFAULT on 'connectToHostEncrypted();'

Question

I am attempting to connect to the Twitch chat server via SSL and I basically copied and pasted some code from the Secure SSL Connection example in QT. When I can connectToHostEncrypted it all crashed. Any help is greatly appreciated

Relative code:

void MainWindow::secureConnect()
{
    if (!socket) {
        socket = new QSslSocket(this);
        connect(socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)),
                this, SLOT(socketStateChanged(QAbstractSocket::SocketState)));

    connect(socket, SIGNAL(encrypted()),
            this, SLOT(socketEncrypted()));

    connect(socket, SIGNAL(error(QAbstractSocket::SocketError)),
            this, SLOT(socketError(QAbstractSocket::SocketError)));

    connect(socket, SIGNAL(sslErrors(QList<QSslError>)),
            this, SLOT(sslErrors(QList<QSslError>)));

    connect(socket, SIGNAL(readyRead()),
            this, SLOT(socketReadyRead()));
    }
    qDebug() << 2;
    socket->connectToHostEncrypted("irc.chat.twitch.tv", 443);
    QEventLoop loop;
    connect(socket, SIGNAL(connected()), &loop, SLOT(quit()));
    loop.exec();
    qDebug() << 5;
    sendData("PASS oauth:" + TwitchAccessToken);
    sendData("NICK ThatRedstoneGT");
    sendData("JOIN smartguy316");
    sendData("PRIVMSG Hello!");
}

Declaration:

Public:
QSslSocket *socket:

Answer 1

Putting this as an answer as I'm not sure I've managed to get my point across in the comments.

You have a class MainWindow with a member socket . Keeping things to a minimum let's say it's...

class MainWindow {
public:
  MainWindow();
  void secureConnect();
  void sendData(QString text);
  QSslSocket *socket:
};

Now, I would expect the constructor implementation to look something like...

MainWindow::MainWindow ()
  : socket(nullptr)
  {}

If you don't initialize socket to nullptr before MainWindow::secureConnect is called then it will have some random value. In which case...

if (!socket) {

will fail meaning that the block containing...

socket = new QSslSocket(this);

will never be executed.

By way of a test, can you run your code under a debugger, set a breakpoint on the line...

if (!socket) {

and check the value of socket . The first time that line is hit socket should be null. Is it?