Correct syntax to register object reference using qRegisterMetaType?

[SPlatten]

@SGaist Of course.

[SPlatten]

Ok, I've now got rid of the warning, by going through all the QObject::connect calls and only using Qt::DirectionConnection where the signal and slot pointers are the same.

[JonB]

@SPlatten
A lot of your questions are about threads. Are your connect()s' senders/receivers never in separate threads?

[SPlatten]

@JonB , not for the ones where I've used Qt::DirectConnection

[Christian Ehrlicher]

@SPlatten said in Correct syntax to register object reference using qRegisterMetaType?:

not for the ones where I've used Qt::DirectConnection

Then it's useless since then Qt::AutoConnection evaluates to Qt::DirectConnection. Specifying a connection type is not needed in most of the cases.

[SPlatten]

@Christian-Ehrlicher , Well that's the only change I'm implemented and now there is no message, so perhaps this is something that needs looking at?

[SGaist]

@SPlatten said in Correct syntax to register object reference using qRegisterMetaType?:

@Christian-Ehrlicher , Well that's the only change I'm implemented and now there is no message, so perhaps this is something that needs looking at?

For that a minimal compilable example would be needed.

[Christian Ehrlicher]

@SPlatten said in Correct syntax to register object reference using qRegisterMetaType?:

so perhaps this is something that needs looking at?

This means that there is a thread context switch somewhere even you tell us it isn't.

[kshegunov]

@SPlatten said in Correct syntax to register object reference using qRegisterMetaType?:

@Christian-Ehrlicher , Well that's the only change I'm implemented and now there is no message, so perhaps this is something that needs looking at?

Run with QT_FATAL_WARNINGS=1 as an environment variable and extract the stack trace, then you will have leveraged your debugger to show you exactly where you're passing a reference between threads.

[SPlatten]

@kshegunov said in Correct syntax to register object reference using qRegisterMetaType?:

QT_FATAL_WARNINGS=1

I've opened both .pro files and added that line, then cleaned and rebuilt, the applications have been running for several minutes, nothing to report, no issues.

[SGaist]

It's an environnement variable, not a define.

You have to set it in the Run tab of the Project panel.

[SPlatten]

@SGaist , Yes, just googled it and then added as environment variable:

export QT_FATAL_WARNINGS=1

Then restarted, same, not seeing anything additional.

[SGaist]

Restarted what ?
How are you currently running your application ?

[SPlatten]

@SGaist , I launch the processes with Qt Creator in debug mode, using two separate instances of Qt Creator.

[SGaist]

Did you check the environment variables in the Run part of the Project Panel to ensure it's properly set ?

[SPlatten]

@SGaist , I checked in a terminal, I don't know how or where to "Run part of the Project Panel" ?

[jsulm]

@SPlatten said in Correct syntax to register object reference using qRegisterMetaType?:

I don't know how or where to "Run part of the Project Panel" ?

Easy to find actually.
Left pane: Projects -> Build & Run -> Run...

[SPlatten]

@jsulm , thank you, added it now, building now.