QTcpSocket, execution halts why and what does it mean?

[SPlatten]

@Pl45m4, I wasn't trying to block the event loop.

[KroMignon]

@SPlatten said in QTcpSocket, execution halts why and what does it mean?:

To the thread loops, is this enough?

I am not sure, is clsMsgSender a QThread or a QObject?

@SPlatten I will try to share with you how I use QTcpSocket.

First, there is no need to create a thread for that, the easiest implementation is (for me):

// supposing mSocket is a member of the current class
mSocket = new QTcpSocket();

// remove TCP delay
mSocket->setSocketOption(QAbstractSocket::LowDelayOption, 1);

QObject::connect(mSocket, &QAbstractSocket::connected,
                 [this]()
                 {
                    qDebug() << "Connected with" << mSocket->peerPort();
                    // Do stuff here                  
                 });
QObject::connect(mSocket, &QAbstractSocket::disconnected,
                 [this]()
                 {
                    qDebug() << "Disconnected from" << mSocket->peerPort();
                    mSocket->delateLater();
                    mSocket = nullptr;
                 });
QObject::connect(mSocket, &QIODevice::bytesWritten,
                 [this](qint64 bytes)
                 {
                    qDebug() << bytes << "send to " << mSocket->peerPort();
                    // do stuff (add next data?)
                 });
                 
mSocket->connectToHost(remoteIp, tcpPort);
QObject::connect(mSocket, &QIODevice::readyRead, [this](){
    auto buffer = mSocket->readAll();
    qDebug() << "receiving" << buffer.size() << "bytes from" << mSocket->peerPort();
    // do stuff with data
});

[Pl45m4]

@SPlatten said in QTcpSocket, execution halts why and what does it mean?:

the examples I've found on QThread do not include how to NOT block the event loop

Here, this wont block:

• https://www.bogotobogo.com/Qt/Qt5_QTcpSocket.php (your 2nd linked example)

This guy (https://stackoverflow.com/questions/37167927/proper-way-to-run-managable-background-thread-with-qthread) has made a similar mistake.
You want to connect once and then let the event loop and your signals do the rest.

[Christian Ehrlicher]

Funny - this discussion was already done more than 3 months ago already: https://forum.qt.io/topic/120700/receiving-data-from-qtcpsocket/30

[SPlatten]

@Christian-Ehrlicher , is it any surprise I'm confused, in that thread you pointed me to the Fortune client and server examples, which I have been following then there is conflicting advice that comes back form this forum when I implement a solution that I'm having problems with.

Add to this the what appears to be flaky Qt Creator with updates that seem to send me backwards. I feel I'm loosing the plot.

[Christian Ehrlicher]

The old thread told you to use signals and slots and not the waitFor functions and now we're at the exactly same place.

[SPlatten]

@Christian-Ehrlicher , well obviously I have mental memory issues.

[SPlatten]

@Christian-Ehrlicher , the examples that ship with Qt 5.15.2 include:

blockingfortuneclient
threadedfortuneserver

On looking at both, these are the sources I used to base my work on. My server is slightly different in that the clients are intended to stay connected after establishing a connection.

I will compare the client source with my own.

[Christian Ehrlicher]

From my pov you don't need threads at all but this is not what you want to hear for whatever reason - you rather work on simple stuff like a QTcpSocket for months.

[SPlatten]

@Christian-Ehrlicher , one day I will be ready to share what I'm working on, which isn't now.

[KroMignon]

@SPlatten said in QTcpSocket, execution halts why and what does it mean?:

one day I will be ready to share what I'm working on, which isn't now.

This sentence sounds strange to me.

I think you misunderstanding some comments/replies you received here.
My personal goal is to help other developers to solve problem they have will creating software with Qt, like I received help from other to solve/understand errors in my software.

On the other side, this also helps me to get a better overview of Qt Framework and continue to learn.

[SPlatten]

@KroMignon , sorry, some of the comments, not yours I find a little offensive.

[Pl45m4]

@KroMignon said in QTcpSocket, execution halts why and what does it mean?:

My personal goal is to help other developers to solve problem they have will creating software with Qt, like I received help from other to solve/understand errors in my software.
On the other side, this also helps me to get a better overview of Qt Framework and continue to learn.

This is exactly why I'm here :D