[Interest] Enumerating context properties from QML

[Jérôme Godbout]

If the context object is null, you probably have an error somewhere, your
context should outlive your object, unless you are during the creation of
the object step (after the QQmlComponent beginCreate() but before
the completeCreate() call?). If so indeed the object is not completed yet.
If this is not the case, I'm not sure I understand when you try to do this
or how you have a null context. Sorry for the noise, might help someone to
figure it out.

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Jerome Godbout
Software Developer
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On Wed, Dec 20, 2017 at 1:19 PM, Alexander Ivash <elderorb at gmail.com> wrote:

> That's what I already tried but the issue is that context object is null
> before and after setting context properties/loading QML.
>
> Anyway, thank you for reply!
>
> 2017-12-20 16:21 GMT+00:00 Jérôme Godbout <jerome at bodycad.com>:
>
>> I'm not sure it will work but one might try. You might recover the object
>> context and maybe scan the meta object to find the properties.
>>
>> *auto context = QQmlEngine::contextForObject(myObjPtr);*
>>
>> Since there's no getter into the context directly. The only getter is
>> *contextProperty(const QString& name)*
>>
>> Maybe the meta object of the context could hold some information, not
>> sure it will help but can give some idea.
>> *auto meta_obj = context->metaObject();*
>>
>> Iterate on properties to see if you can extract some information out of it
>> *for(int i = 0; i < meta_obj->propertyCount(); ++i)*
>> *{*
>> *  auto meta_property = **meta_obj->**property(i);*
>>
>> *  // check if the property hold anything of interest here
>> http://doc.qt.io/qt-5/qmetaproperty.html
>> <http://doc.qt.io/qt-5/qmetaproperty.html>*
>> *}*
>>
>> I'm really not sure if this could extract anything from Context value but
>> might worth a small test. Check into the meta info, maybe something can
>> salvage the information (we do this to inspect particular object to debug
>> them but for Context, I never really tried.
>>
>> [image: bodycad] <https://www.bodycad.com/>
>> Jerome Godbout
>> Software Developer
>> 2035 rue du Haut-Bord, Québec, QC, Canada. G1N 4R7
>> <https://maps.google.com/?q=2035+rue+du+Haut-Bord,+Qu%C3%A9bec,+QC,+Canada.+G1N+4R7&entry=gmail&source=g>
>> T:  +1 418 527-1388 <(418)%20527-1388>
>> E: jerome at bodycad.com
>> www.bodycad.com
>>
>> The contents of this email message and any attachments are intended
>> solely for the addressee(s) and may contain confidential and/or privileged
>> information and may be legally protected from disclosure. If you are not
>> the intended recipient of this message or their agent, or if this message
>> has been addressed to you in error, please immediately alert the sender by
>> reply email and then delete this message and any attachments. If you are
>> not the intended recipient, you are hereby notified that any use,
>> dissemination, copying, or storage of this message or its attachments is
>> strictly prohibited.
>>
>> Le contenu de ce message et les pièces jointes sont destinés uniquement
>> pour le(s) destinataire(s) et peuvent contenir des informations
>> confidentielles et / ou privilégiées qui peuvent être protégées légalement
>> contre toute divulgation. Si vous n'êtes pas le destinataire de ce message
>> ou son agent, ou si ce message vous a été adressé par erreur, s’il vous
>> plaît avertir immédiatement l'expéditeur par courriel de réponse, puis
>> supprimer ce message et les pièces jointes. Si vous n'êtes pas le
>> destinataire prévu, vous êtes par la présente informé que toute
>> utilisation, diffusion, copie, ou stockage de ce message ou de ses pièces
>> jointes est strictement interdit.
>>
>> On Tue, Dec 19, 2017 at 7:08 PM, Alexander Ivash <elderorb at gmail.com>
>> wrote:
>>
>>> Let's say I exposed 'property1' to QML from C++ using
>>> setContextProperty. How can I enumerate all the context properties
>>> exposed from QML side? I've tried enumerating properties of 'Qt'
>>> object but obviously it didn't work.
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>>
>>
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