[Interest] using a C++ class in QML in Qt6

[ekke]

Hi Dirk,
in my apps ATM I'm only using one qt qml module, so I'm doing 
engine.loadFromModule(...)
see https://t1p.de/ekkeCMakeQMLModule

Have no experiences yet if you have to deal with more modules. Later 
will modularize my apps, much other refactorings must be done before ;-)

but you should not do multi engine.loadFrom...

good night...

ekke

Am 31.08.24 um 22:53 schrieb Dirk Hohndel via Interest:
> Hi Ekke,
>
> Thanks so much for the quick response.
>
> This is a massive project (Subsurface-mobile) that we build with CMake.
>
> Thanks for the link to your site with an explanation... this feels 
> like I'm **ALMOST** there...
>
> I had already added QML_ELEMENT to the class header.
>
> In the existing code, we load the main.qml from the resource system with
>
> engine.load(QUrl(QStringLiteral("qrc:///qml/main.qml")));
>
> I added a second line
>
> engine.loadFromModule("subsurface/mobile/main", "QMLProfile");
>
> Rebuilt things and get:
>
> INFO: QQmlApplicationEngine failed to load component
> INFO: qrc:/qml/main.qml:8:1: module "subsurface.mobile.main" is not 
> installed
> INFO: QQmlApplicationEngine failed to load component
> INFO: <Unknown File>: No module named "subsurface/mobile/main" found
>
> Do I need to do anything else to ensure that the type is visible and 
> subsequently the module is found?
>
> Thanks again for your help!
>
> /D
>
>> On Aug 31, 2024, at 12:56, ekke <ekke at ekkes-corner.org> wrote:
>>
>> What is your build system ? QMake or CMake ?
>>
>> Instead of qmlRegisterType you should use QML_ELEMENT
>> see https://t1p.de/ekkeQML_ELEMENT
>>
>> ekke
>>
>> Am 31.08.24 um 21:23 schrieb Dirk Hohndel via Interest:
>>>
>>> Hi there,
>>>
>>> I've been trying to figure out how to port a QML app from Qt5 to Qt6 
>>> and have been unable to solve what seems like a fairly basic issue.
>>>
>>> In the Qt5 version, I was able to make a class available from C++ by 
>>> simply calling
>>>
>>> ...
>>> qmlRegisterType<QMLProfile>("org.subsurfacedivelog.mobile", 1, 0, 
>>> "QMLProfile)
>>> ...
>>>
>>> in the C++ code and then using
>>>
>>> import org.subsurfacedivelog.mobile
>>>
>>> in the QML file in order to then be able to use that type as
>>>
>>> QMLProfile {
>>> ...
>>> }
>>>
>>> in the QML code.
>>>
>>> When I try this code unmodified, it compiles fine, but at run time 
>>> tells me that it cannot find the org.subsurfacedivelog.mobile module 
>>> when it encounters that import org.subsurfacedivelog.mobile line.
>>>
>>> So I tried some searching and found several pages in the Qt6 
>>> documentation that all seem to imply that this isn't how things 
>>> should be done in Qt6 and that instead I would need to go down the 
>>> route of defining a separate QML module with its own compile unit 
>>> (is this true? why would you disable this core feature???)
>>>
>>> And then trying to do that, I fail to get the module to compile with 
>>> missing include paths.
>>> If it turns out that that's the only way to go, I'll happily give a 
>>> lot more details on this issue -- but I'd love to first get back to 
>>> the previous approach.
>>> Is there still a way in Qt6 to register a Type with QML without 
>>> having to create separate modules?
>>>
>>> Thanks
>>>
>>> /D
>>>
>>> _______________________________________________
>>> Interest mailing list
>>> Interest at qt-project.org
>>> https://lists.qt-project.org/listinfo/interest
>>
>> _______________________________________________
>> Interest mailing list
>> Interest at qt-project.org
>> https://lists.qt-project.org/listinfo/interest
>
>
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> https://lists.qt-project.org/listinfo/interest
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20240831/26baa772/attachment.htm>