QQuickWindow::grabWindow: scene graph already in use

[TheIndependentAquarius]

I tried the code shown here: http://stackoverflow.com/questions/1...eenshot-qt-qml

On execution I am getting the error written in the title.

My **main.cpp** is:

#include <QGuiApplication>
    #include <QQmlApplicationEngine>
    #include <QQuickWindow>
    #include <QImage>
    #include <QDebug>
    #include "screenshot.h"
    #include <QQuickView>
    #include <QQmlContext>
 
    int main(int argc, char *argv[])
    {
        QGuiApplication app(argc, argv);
 
        const char* drigUi = "DrigUI"; 
        qmlRegisterType <screenCapture> (drigUi, 1, 0, "ScreenShot");
 
        QQmlApplicationEngine engine;
        engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
 
        return app.exec();
    }

#include <QGuiApplication>
    #include <QQmlApplicationEngine>
    #include <QQuickWindow>
    #include <QImage>
    #include <QDebug>
    #include "screenshot.h"
    #include <QQuickView>
    #include <QQmlContext>
    
    int main(int argc, char *argv[])
    {
        QGuiApplication app(argc, argv);
    
        const char* drigUi = "DrigUI"; 
        qmlRegisterType <screenCapture> (drigUi, 1, 0, "ScreenShot");
    
        QQmlApplicationEngine engine;
        engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    
        return app.exec();
    }

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I used this **capture** function:

void screenCapture::capture(QString const &path) const
    {
        QImage img = currentView_->grabWindow();
        img.save(path);
    }

void screenCapture::capture(QString const &path) const
    {
        QImage img = currentView_->grabWindow();
        img.save(path);
    }

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and added the following in the constructor:

currentView_ = new QQuickView;

currentView_ = new QQuickView;

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My ***main.qml*** :

import QtQuick 2.4
    import QtQuick.Window 2.2
 
    import DrigUI 1.0
 
    Window
    {
        visible: true
        height: 370
        width: 370
 
        ScreenShot { id: screenShot }
 
        Rectangle
        {
            id: ll
            height: 30
            width: 50
            x: 180; y: 0; color: "red"
            MouseArea
            {
                anchors.fill: parent
                onClicked: screenShot.capture ("l.png")
            }
        }
    }

import QtQuick 2.4
    import QtQuick.Window 2.2
    
    import DrigUI 1.0
    
    Window
    {
        visible: true
        height: 370
        width: 370
    
        ScreenShot { id: screenShot }
    
        Rectangle
        {
            id: ll
            height: 30
            width: 50
            x: 180; y: 0; color: "red"
            MouseArea
            {
                anchors.fill: parent
                onClicked: screenShot.capture ("l.png")
            }
        }
    }

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What does that error mean? What is the way to solve it? What else info can I provide here?