waitForConnected() hangs my program !

Francky033

Hello,

I have a major problem with the latest version of Qt (5.12.1)

A simple function like this blocks the program under Windows 10 and Android. However, nothing to report on Linux and macOS.

bool Internet::CheckConnection(QString server)
{
	QTcpSocket socket;
	socket.setProxy(QNetworkProxy::NoProxy);
	socket.connectToHost(server, 80);

	// Renvoie false si pas connecté
	rerun socket.waitForConnected(2000);
}

In addition, I see also important break times with code like that:

reply3 = manager3->get(QNetworkRequest(url));

	// Whenever more data is received from the network,
	// this readyRead() signal is emitted
	connect(reply3, SIGNAL(readyRead()),
		this, SLOT(httpReadyRead3()));

	// Also, downloadProgress() signal is emitted when data is received
	//connect(reply, SIGNAL(downloadProgress(qint64, qint64)),
	//	this, SLOT(updateDownloadProgress(qint64, qint64)));

	// This signal is emitted when the reply has finished processing.
	// After this signal is emitted,
	// there will be no more updates to the reply's data or metadata.
	connect(reply3, SIGNAL(finished()),
		this, SLOT(httpDownloadFinished3()));

	thread3->start();

Nothing to report with Qt 5.12.0 and 5.11.3

What should I do?

Thanks !

Francky033

Christian Ehrlicher

@Francky033 said in waitForConnected() hangs my program !:

bool Internet::CheckConnection(QString server)
{
QTcpSocket socket;
socket.setProxy(QNetworkProxy::NoProxy);
socket.connectToHost(server, 80);

// Renvoie false si pas connecté
rerun socket.waitForConnected(2000);
}

This will block 2 seconds when e.g. the server you want to reach is not available. And this function is somewhat useless - you're connecting to a socket but then deleting it as soon as it is connected...

Francky033

Yes, this function only allows me to check, or not, the availability of a server. But the problem is that it doesn't answer after 5 minutes ! It's just an example of code....
But since these are secure connections, maybe it's a version problem with the ssleay32.dll and libeay32.dll files?

Which versions should be used with Qt 5.12.1 ?

Francky033

Maybe it is necessary to compile openssl in the version returned by QSslSocket::sslLibraryBuildVersionString and deliver the files libeay32.dll and ssleay32.dll with the executable?