[Interest] QML objects and QMetaMethod

[Jean-Michaël Celerier]

It also works if I remove Q_OBJECT from my C++ type:


    namespace lib {
      class MyObject : public QObject {  };
    }

    qmlRegisterType<lib::MyObject>("MyLib", 1, 0, "MyObject");

works as expected, but if I add Q_OBJECT in

      class MyObject : public QObject {  };

then it does not work anymore


-------
Jean-Michaël Celerier
http://www.jcelerier.name


On Sun, Oct 7, 2018 at 11:07 PM Jean-Michaël Celerier <
jeanmichael.celerier at gmail.com> wrote:

> > well, the problem is that createTree() does not registered in your
> QObject-derived class.
>
> but why does it work in the following case then ?
>
>     QtObject {
>       function createTree() { }
>     }
>
>
> -------
> Jean-Michaël Celerier
> http://www.jcelerier.name
>
>
> On Sun, Oct 7, 2018 at 1:00 PM Vlad Stelmahovsky <
> vladstelmahovsky at gmail.com> wrote:
>
>> well, the problem is that createTree() does not registered in your
>> QObject-derived class. its a part of instantiated object ant metasystem
>> have no clue about it
>>
>> I think you need to register it 1st in header somehow
>> On 10/7/18 12:41 PM, Jean-Michaël Celerier wrote:
>>
>> Yes, that's what I'm doing, but I 'm typing the code in the mail - sorry
>> for the typo.
>>
>> Here's something even more fundamental : the following prints all the
>> functions if my type is a QtObject descendant, but it does not if my type
>> is a MyLib.MyObject descendant
>>
>>     for(int i = 0; i < obj->metaObject()->methodCount(); i++) {
>>       qDebug() << obj->metaObject()->method(i).name();
>>     }
>>
>>
>> -------
>> Jean-Michaël Celerier
>> http://www.jcelerier.name
>>
>>
>> On Sun, Oct 7, 2018 at 12:39 PM Vlad Stelmahovsky <
>> vladstelmahovsky at gmail.com> wrote:
>>
>>> QMetaMethod::invokeMethod(obj, "createTree");
>>> On 10/7/18 12:34 PM, Jean-Michaël Celerier wrote:
>>>
>>> Hello,
>>> I have the following code :
>>>
>>> Foo.qml :
>>>
>>>     MyLib.MyObject {
>>>       function createTree() { /* stuff */ }
>>>       property string host: "ws://whatever.com"
>>>     }
>>>
>>> cpp :
>>>
>>>     namespace lib {
>>>       class MyObject : public QObject { Q_OBJECT };
>>>     }
>>>     ...
>>>     QQmlComponent c(engine);
>>>     c.setData("content of Foo.qml", QUrl());
>>>
>>>     auto obj = c.createObject();
>>>     QString host = QQmlProperty(obj, "host").read();
>>>     QMetaMethod::invokeMethod("createTree");
>>>
>>> Reading the "host" property works fine so the QML object is correctly
>>> instantiated. But the invokeMethod call gives me a warning :
>>>
>>>     QMetaObject::invokeMethod: No such method
>>> 'lib::MyObject::createTree()'
>>>
>>> The weird thing being: it works fine if I replace MyLib.MyObject with
>>> QtObject on the QML side.
>>> Of course I want to use some additional methods present in MyObject so
>>> this is not a solution.
>>>
>>> Anyone knows what is going on here ?
>>>
>>> Thanks,
>>> Jean-Michaël Celerier
>>>
>>>
>>>
>>>
>>>
>>> -------
>>> Jean-Michaël Celerier
>>> http://www.jcelerier.name
>>>
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>>
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