[Interest] QML objects and QMetaMethod

[Jean-Michaël Celerier]

> 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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