[SOLVED] Empty QJsonDocument from file

[ningu]

Thanks for the quick answer.

Unfortunately, even though you are right, removing the superfluous comma did not solve the problem. The QDomDocument is still empty.

[ningu]

I think the error is in the loading of the file.
@qDebug() << file.bytesAvailable();@

outputs 0, although it seems to load fine (no error output).

[ningu]

If I load the data from the file to QDomDocument object it seems to work fine. I very puzzled.

[SGaist]

Hi,

Just to be on the safe side, did you properly put your json file in the resources (qrc file) ?

You keep talking about QDomDocument, is it a typo ?

[ningu]

Yes, the file is properly put in my qrc file.

And yes, sorry, when I said

bq. Unfortunately, even though you are right, removing the superfluous comma did not solve the problem. The QDomDocument is still empty.

I meant the QJsonDocument is still empty.

But later on I tried to load the data into a QDomDocument object just to try and it seems to work fine.
@
QDomDocument *domDocument;
if (!domDocument->setContent(&file)) {
qDebug() << "Could not set DOM";
return;
}

qDebug() << domDocument->toString();@

prints the file contents to the console.

Sorry for the confusion I created with the typo.

[SGaist]

Ok, then what does

@qDebug() << file.readAll()@

return ?

[ningu]

It returns
@""@

[SGaist]

Then it seems that your file is empty

[ningu]

That's what I thought, but
@qDebug() << QString::fromUtf8(file.readAll())@
returns the file contents.

[ningu]

Might it be an encoding issue?

[ningu]

Sorry, that was not completely right:
@QString jsonString = QString::fromUtf8(file.readAll());
qDebug() << jsonString;
@
returns the file contents, while
@qDebug() << QString::fromUtf8(file.readAll())@
returns
@""@

[SGaist]

Strange, QJsonDocument should handle it...
Did you check what error you got when using fromJson ?

[ningu]

No, I didn't. How could I do that?

[ningu]

Ok, I got it. A friend of mine pointed me out that I was looking for the array in the QJsonDocument, and that I should probably be looking for the object, which worked.

The only thing that doesn't work right is that
@QString jsonString = QString::fromUtf8(file.readAll());

QJsonDocument jsonDoc = QJsonDocument::fromJson(jsonString.toUtf8());@
works, but
@QJsonDocument jsonDoc = QJsonDocument::fromJson(file.readAll());@
doesn't.

[SGaist]

Look at the second parameter of "fromJson":http://qt-project.org/doc/qt-5.0/qtcore/qjsondocument.html#fromJson

From there you can get the error

[ningu]

It's an 'Illegal value' error. But I get the same error even with an empty file.

[SGaist]

Could it be your json file encoding that is problematic ?

[ningu]

That might be it. Is there a way to make sure the file is UTF8? Or set it to UTF8?

[SGaist]

If you are using QtCreator you could check the editor settings to ensure that it uses UTF8

[ningu]

Ah, that did it!

Thank you very much for all your help SGaist!