QThread parent issues

raketmus

Hello, i have a issue rigth now about threads i have a socket thread which own the socket, but when i invoke the send methoed from the gui thread and then call write on the socket i get the following error message.
(Parent is QNativeSocketEngine(0x26123e4ada0), parent's thread is SocketThread(0x26123e3bda0), current thread is QThread(0x2611f38fde0)
but i invoked the methoed should the current thread not be socketthread and not qthread?
How do i fix this?

SGaist

Hi,

If you call it directly then no.

How are you using that code ?

raketmus

i call it like so

QMetaObject::invokeMethod(clients[0], "send", Qt::QueuedConnection, Q_ARG(Message, message2));

this from my gui thread, clients[0] is a pointer to the sockethread and send is the send methoed.

SGaist

Can you show the code where you create your objects and thread ?

JKSH

@raketmus said in QThread parrent issues:

QMetaObject::invokeMethod(clients[0], "send", Qt::QueuedConnection, Q_ARG(Message, message2)); 
...clients[0] is a pointer to the sockethread and send is the send methoed.

The first argument to QMetaObject::invokeMethod() should be an object that lives in the thread. You should pass a pointer to an object that was created inside the thread.

client[0] manages a thread, but it does not live in that thread. It lives in your GUI thread. Call this to check:

qDebug() << clients[0];
qDebug() << clients[0]->thread();
qDebug() << qApp->thread(); // qApp is your QApplication which lives in the GUI thread

i have a socket thread

You don't usually need a thread for a socket. Just leave the socket in the GUI thread. Qt socket classes and other communications classes are asynchronous.

raketmus

@JKSH
Here is the output of the debugging it.

SocketThread(0x1d02b90b3d0)
QThread(0x1d02b870250)
QThread(0x1d02b870250)

It would see they all have the same id.

You don't usually need a thread for a socket. Just leave the socket in the GUI thread. Qt socket classes and other communications classes are asynchronous.

i am running a server and i would like to use blocking since that is how i set my sockets up.
but i am not sure how you want me to call it if not like i am doing right now.