CODEWITHSUNDEEP
c++qtqml
John Smith
John Smith

Reputation: 302

Pass 2d Array from c++ to qml

The question is above. I can create a 2d array in qml like this:

function create()
{
    var array= new Array(9);
    array[0]= new Array(
}

So how I can create such array in c++? I tried:

QVariant myArray= QVariant([4,5,6,7]);

but this doesn't work.

Upvotes: 1

Views: 1346

Answers (3)

miyan
miyan

Reputation: 113

Add more info about QVariantList:

if use append:

QVariantList list;
for (int i = 0; i < 100; ++i) {
    list.append(QVariantList{i, rand() * sin(i)});
}

then the list received in js will be a 1d array, which makes me confused,

but if use insert:

QVariantList list;
for (int i = 0; i < 100; ++i) {
    list.insert(list.end(), QVariantList{i, rand() * sin(i)});
}

it keeps the dimension, i can receive 2d array in js

Upvotes: 0

p-a-o-l-o
p-a-o-l-o

Reputation: 10057

The problem is: QVariant cannot store arrays, so this lines won't compile at all:

int array[] = {0, 1, 2};
QVariant v = array;

or

QVariant x = {0, 1, 2};

or

QVariant x{0, 1, 2};

A specific type exists, though, so you'd be better doing:

QVariantList myArray =
{
    QVariantList{4, 5, 6, 7},
    QVariantList{0, "one", true}
    //etc
};

and access items like:

int x = myArray[0].toList()[0].toInt();
bool y = myArray[1].toList()[2].toBool();

Upvotes: 1

Nejat
Nejat

Reputation: 32665

You can use QVariantList which could be passed to qml:

QVariantList list;
list.append(QVariantList{5, 5, 6, 7});

Upvotes: 2

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