@hskoglund said in QObject::connect: Cannot queue arguments of type 'QTextCursor':

Thanks for the clarification, it makes sense., i.e. the detection is not "shaky" it's impossible to do!

Exactly!

I should have a coffee and study the source code for how that detection is done when signals are emitted across threads.

Coffee sounds nice, I'm now envious ... ;)
You can look here about the second part:
https://code.woboq.org/qt5/qtbase/src/corelib/kernel/qobject.cpp.html#_ZN11QMetaObject8activateEP7QObjectiiPPv

And, this "problem" with connecting to lambdas across threads should be documented better I think.

Perhaps you're right, but I'm too lazy to check what it really says in the docs ... :p
However I think it's documented, probably more emphasis can be put though.

@romsharkov
Hi there,

Do I understand correctly that you have managed to run a QQmlProcess in a separate process?

I am asking it because I have came across pretty much the same problem:
https://github.com/sailfish-sdk/sdk-harbour-rpmvalidator/pull/79#issuecomment-307348648

If you could tell me some words of you implementation details that would be awesome!
Thanks in advance!

@Chris-Kawa thanks for the hint. Works now :)

@Chris-Kawa yes that is an option, but what if erros appear while the processes running? If i put the MessageBox after the for-loop i need a mechanism to check if there was an error or not. therefore i wanted to use Signal and Slot for the process.

EDIT
i solved it. I wrote a function in which i check if there where errors with readAllStandardError and if the size of it is zero, no error appeared and the show the message box.

I understand your advice. 1 app access the file and the other app communicate directly to the first app. However, I aimed to use a memory-mapped-file just because I read some articles where it said this is one of the best practice to communicate two process without lossing information. Is this correct?

I am really interested in your advices, so I present my case:

GUI <-> MainAPP <-> SPortAPP

GUI can be anything made for anybody with the only requirement of implementing a protocol/API to communicate to MainAPP. (e.g. sockets)
MainAPP is my application who implement mathematics, logic, etc and defines the behaviour of my system. It cannot lose any information so I thought I might save it on a file.
SPortAPP is a propietary protocol implementation whereby external systems read/write information to the database of MainAPP . This app shouldn't interact directly to MainAPP
So, Such information must be available to read and write by both MainAPP and SPortAPP.

what is your opinion about it? Do you reccomend any other type of implementation?