How to send an array of integers from QML to C++? Can anyone fix this code such that ...

mshefiti

So I have a signal:

QML:
@signal qmlSendWorkflowIdsArraySignal(variant workflowIdsArray)@

JS:
@sendToCppWorkflowIdsArray(arrayOfWorkflowIds);@

C++:
@QObject::connect(qmlMainContentItemObject, SIGNAL(qmlSendWorkflowIdsArraySignal(QVariant)), &myController, SLOT(qmlToCppWorkflowIdsArraySlot(QVariant)));@

then
@void qmlToCppWorkflowIdsArraySlot(QVariant workflowIdsArray)
{
qDebug() << " +++++++++++++++ Cpp Array slot has been called: "<<workflowIdsArray;
}@

*Output: *
@+++++++++++++++ Cpp Array slot has been called:
QVariant(QVariantList, (QVariant(QString, "2") , QVariant(QString, "3") , QVariant(QString, "4") ) )@

How do I read this QVariantList inside QVariant, ie, lets say I want to read this first element of the array, that is QVariant(QString, "2"), then the other and the other. This looks very complicated like this.
All I need is to pass an array of integers from QML to C++, so I can read this array.
I dont want to use QVariant or a QVariantList, unless I have to as I see no other way to do it.

Anyone any suggestion? Any professionals out there??

Thank you !!!!

sohail

I'm not sure I understand your question. I'd just use a QVariantList in your slot.

Also, using signals and slots to pass information is not the best idea. If it isn't an event, stick to using Q_INVOKABLE

mshefiti

[quote author="sohail" date="1418664714"]I'm not sure I understand your question. I'd just use a QVariantList in your slot.

Also, using signals and slots to pass information is not the best idea. If it isn't an event, stick to using Q_INVOKABLE[/quote]

How do I use Q_Invokable from qml? I am using Q_invokable to invoke JS methods from C++, but not the other way around.
If I use QVariantList, need to use QVariantList on the Signal from QML. Here QML:
@signal qmlSendWorkflowIdsArraySignal(variant workflowIdsArray)@

So basically I am sending workflowIdsArray, which I defined as type variant.
What is the syntax in QML to define a signal such that my workflowIdsArray is of type QVariantList?

I have tried:
@signal qmlSendWorkflowIdsArraySignal( QVariantList workflowIdsArray);@

But that is not a valid syntax.

p3c0

Hi,

bq. How to send an array of integers from QML to C++?

Something like this:
@
//cpp
Q_INVOKABLE void setList(QVariantList arr) {
qDebug() << arr;
}

//qml
property var arr: [1,5,7]

Component.onCompleted: {
obj.setList(arr) //obj=contextproperty object
}
@