To Display Video Frames from webcam on QML

[ChrisW67]

Seems that you have added your image provider with the name "color" but are trying to access "colors".

[bts-007]

ChrisW67 I have changed the "color" to "colors". Even though I am getting the same error. I am not sure with the syntax. Is it correct to mention the image name in qml or I should load the image with qpixmap.

[bts-007]

with no other option I tried the example program from nokia developer site here is the link

http://harmattan-dev.nokia.com/docs/...eprovider.html

when I tried the above example I got an error message "QML Image:Failed to get image from provider: image://colors/yellow"

Here is the code with few changes from example

main.cpp

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include <QDeclarativeEngine>
#include <QDeclarativeImageProvider>
 
 
class ColorImageProvider : public QDeclarativeImageProvider
{
public:
    ColorImageProvider()
        : QDeclarativeImageProvider(QDeclarativeImageProvider::Pixmap)
    {
    }
 
    QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
    {
        int width = 100;
        int height = 50;
 
        if (size)
            *size = QSize(width, height);
        QPixmap pixmap(requestedSize.width() > 0 ? requestedSize.width() : width,
                       requestedSize.height() > 0 ? requestedSize.height() : height);
        pixmap.fill(QColor(id).rgba());
 
        return pixmap;
    }
};
 
 int main(int argc, char *argv[])
{
    QScopedPointer<QApplication> app(createApplication(argc, argv));
 
    QmlApplicationViewer viewer;
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
    viewer.setMainQmlFile(QLatin1String("qml/yellow_red_imageprovider/main.qml"));
    viewer.showExpanded();
 
    QDeclarativeEngine engine;
    engine.addImageProvider(QLatin1String("colors"), new ColorImageProvider);
 
 
    return app->exec();
}

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include <QDeclarativeEngine>
#include <QDeclarativeImageProvider>


class ColorImageProvider : public QDeclarativeImageProvider
{
public:
    ColorImageProvider()
        : QDeclarativeImageProvider(QDeclarativeImageProvider::Pixmap)
    {
    }

    QPixmap requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
    {
        int width = 100;
        int height = 50;

        if (size)
            *size = QSize(width, height);
        QPixmap pixmap(requestedSize.width() > 0 ? requestedSize.width() : width,
                       requestedSize.height() > 0 ? requestedSize.height() : height);
        pixmap.fill(QColor(id).rgba());

        return pixmap;
    }
};

 int main(int argc, char *argv[])
{
    QScopedPointer<QApplication> app(createApplication(argc, argv));

    QmlApplicationViewer viewer;
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
    viewer.setMainQmlFile(QLatin1String("qml/yellow_red_imageprovider/main.qml"));
    viewer.showExpanded();
    
    QDeclarativeEngine engine;
    engine.addImageProvider(QLatin1String("colors"), new ColorImageProvider);


    return app->exec();
}

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main.qml

import QtQuick 1.1
 
Column {
    Image { source: "image://colors/red" }
    Image { source: "image://colors/yellow" }
}

import QtQuick 1.1

Column {
    Image { source: "image://colors/red" }
    Image { source: "image://colors/yellow" }
}

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I don't know how to solve this problem

[bts-007]

I made some changes in the main file. getting the same error . what is the solution

main.cpp

int main(int argc, char *argv[])
{
    QScopedPointer<QApplication> app(createApplication(argc, argv));
 
 
    QmlApplicationViewer viewer;
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
    viewer.setMainQmlFile(QLatin1String("qml/yellow_red_imageprovider/main.qml"));
    viewer.showExpanded();
    //QDeclarativeEngine engine;
    //engine.addImageProvider(QLatin1String("colors"), new ColorImageProvider);
    viewer.engine()->addImageProvider("colors", new ColorImageProvider);
 
    return app->exec();
}

int main(int argc, char *argv[])
{
    QScopedPointer<QApplication> app(createApplication(argc, argv));


    QmlApplicationViewer viewer;
    viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
    viewer.setMainQmlFile(QLatin1String("qml/yellow_red_imageprovider/main.qml"));
    viewer.showExpanded();
    //QDeclarativeEngine engine;
    //engine.addImageProvider(QLatin1String("colors"), new ColorImageProvider);
    viewer.engine()->addImageProvider("colors", new ColorImageProvider);
    
    return app->exec();
}

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[aamer4yu]

May be because you are returning QPixmap instead of QImage ! ??

Sorry,,, Dint see the class QDeclarativeImageProvider properly You can use requestPixmap() too