Problem with different versions Qt/QML

[Damian7546]

Hi,

In my Windows system with Qt Creator 9.0.1 ,Qt 5.15.2and compiler: MSVC2019 32bit, a did integration my qt logic with qml like below:

qt:

engine.rootContext()->setContextProperty("scannerEventFilter", scannerEventFilter);

QML:

Connections {
        target: scannerEventFilter
        function onReadedTicket(result) {
            console.log("Siganl appear")
            popup_readeTicket.open()
            popup_readeTicket.desc = result
        }
    }

And on Windows system everything works. Next I compied my project dictionary and paste to may other machine in Linux Ubuntu with Qt Creator 5.0.2 , Qt 5.12.12and compiler: GCC 64bit.
I opened project, compile and run.
It turns out that signal in qml doesn't appear. I noticed that in QML Connection line I have a error Unknown component M300. When I check Tools > QML/JS > Reset Code Model the error is cleared. Unfortunatelly after the next compille the error is appear.
What can be wrong ?Why signal doesnt work on Linux ?

[GrecKo]

before 5.14 the Connections syntax was different:

write this instead:

Connections {
    target: scannerEventFilter
    onReadedTicket: {
        console.log("Siganl appear")
        popup_readeTicket.open()
        popup_readeTicket.desc = result // result should be the name of the signal parameter
    }
}

You can also use this syntax in 5.15 (you might get a warning though).

[Damian7546]

@GrecKo thank you very much. it works

[JoeCFD]

@Damian7546 It may be better to use the same version of Qt on all OSs.

[Damian7546]

@JoeCFD I know.

But I am beginner on Linux (Ubuntu) and I had some problem with install qt.

On windows os I installed qt and qtCreator with Qt Online installer -very simple tools.
but on Ubuntu I have troubles.

1. When I tried install from Qt Online installer I have error in setup wizard : Cannot retrieve remote tree
   2)After many times, I gave up on the online installer, and I choosen on qt website: Offline installer/ 5.12.x Offline Installer, and works.

Is any simple way to pupdate my qt on Ubuntu ?

[JoeCFD]

@Damian7546 said in Problem with different versions Qt/QML:

Cannot retrieve remote tree

https://forum.qt.io/topic/122837/download-qt-io-is-down/50
Try it again. I rarely had issues.

[Damian7546]

@JoeCFD awesome, you're right - it works. I lost week ago whole day to find solution:/

Unfortunately after install 5.15.2 Qt version on Ubuntu, I have a problem with deploy application by CQtDeployer tool :/ In old version everything works.

Now, CQtDeployer creating a files to executable file but when I try run my app I get error:

developer@devOS:~/Desktop/deployApp/DistributionKit$ ./Kas*
/home/developer/Desktop/deployApp/DistributionKit/bin/KasApp: error while loading shared libraries: libicui18n.so.56: cannot open shared object file: No such file or directory

Lack of this libraries compared to the old version:

[JoeCFD]

@Damian7546 Try to find out where the libs are located and check out why they are not linked or wrapped properly, On Linux, they are stored under 5.15.2/gcc_64/lib/