Conversion of Qvector<qreal> to QVariant fails

[sayan275]

Why is this conversion from QVector<qreal> to QVariant fails?? same code is working in othermodule while reading values from json and filling in the same type of data structure

Other Module, where it conversion is fine

Any suggestions, what am I missing?

[JonB]

@sayan275
I suggest you put in some code (e.g. suitable qDebug()) to show the result from QVariant::fromValue(), and maybe what is in points, rather than relying on interpreting what is shown in the debugger window.

[sayan275]

@JonB

AnnotationViewerPlugins::RadarChartConfig::on_chartUpdatePBtn_clicked "FRONTLeft_inner_area_yMax"   4.5
AnnotationViewerPlugins::RadarChartConfig::on_chartUpdatePBtn_clicked "FRONTLeft_inner_area_xMin"   4.31
AnnotationViewerPlugins::RadarChartConfig::on_chartUpdatePBtn_clicked "FRONTLeft_inner_area_xMax"   1.81
AnnotationViewerPlugins::RadarChartConfig::on_chartUpdatePBtn_clicked points vec:: QVector(-1.75, 4.5, 4.31, 1.81)
AnnotationViewerPlugins::RadarChartConfig::on_chartUpdatePBtn_clicked pt Variant:: QVariant(QVector<double>, )

[JonB]

AnnotationViewerPlugins::RadarChartConfig::on_chartUpdatePBtn_clicked pt Variant:: QVariant(QVector<double>, )

So far as I can tell, all that shows is that the result is of type QVariant(QVector<double>, ). (Don't know what the significance is of the trailing comma, if any.)

I expected you print out the lengths/values, to see what is going on. Anyway, doesn't the code in the solution at https://stackoverflow.com/questions/40437335/converting-qvariant-to-qvectorint show you what you should be doing? Sorry, that was the wrong way round, it does QVariant to QVector.

[sayan275]

@JonB it's (type, value), since value is empty, there is nothing after ,

penVart:: QVariant(int, 2)

[JonB]

@sayan275
I should have been a lot happier if you extracted the vector from the variant and showed, say, its length rather than relying on the interpretation of how qDebug() displays a variant overall. I trust you are correct.

I agree I am not sure, and I don't know why you seem to show it working in one place and not in another. Why don't you start by temporarily making them integers and testing same code with QVariant<int> instead of QVariant<qreal> so we can eliminate some qreal issue?

[Pl45m4]

@sayan275

It's also always better to post the relevant code as text and not as image, so others can reproduce it easier.