Qt/QML : Send QImage From C++ to QML and Display The QImage On GUI

Question

I created a class Publisher which periodically emits a QImage object.

However I\'m having a tough time drawing the QImage to

Answer 1

Use QQuickItem. There is a Qt example that does this.

C:\Qt\Examples\Qt-5.14.1\quick\scenegraph\threadedanimation

You make a class derived from QQuickItem and register it with qmlRegisterType. Provide the override function 'updatePaintNode' in your class. In the example, the class is 'Spinner'

In updatePaintNode:

Create a node class derived from QObject and QSGTransformNode

In the node class constructor:

Convert your Qimage to an QSGTexture with createTextureFromImage.

Create QSGSimpleTextureNode, set QSGTexture using setTexture

appendChildNode with QSGSimpleTextureNode

In QML add

import Spinner 1.0

and

Spinner {
    anchors.centerIn: parent
    anchors.horizontalCenterOffset: 80
    spinning: true
}