[Solved] Qt on Android : custom module not installed

franchouze

Hello,
I am very new to QML and I am developping an app using Qt 5.2.1 on CentOS 6.4
When deploying my app on my android device I get the message : "could not load : assets :/qml/MyProject/MyPage.qml:5 module "ImageProcessor" is not installed

[EDIT] this problem comes also when I compile in Desktop mode. My post may not be at the right part of the forum. [/EDIT]

I already checked previous posts on this forum and I checked that :

my call to qmlRegisterType is before the definiton to the main qml file
my C++ object inherits from QObject

I used http://kunalmaemo.blogspot.fr/2013/06/using-qml-camera-and-passing-image-to-c.html as my starting point.

Here is the code :
main.cpp
@
int main(int argc, char *argv[])
{
qmlRegisterType<ImageProcessor>("ImageProcessor",1,0,"ImageProcessor");

QGuiApplication app(argc, argv);            
QtQuick2ApplicationViewer viewer;
viewer.setMainQmlFile&#40;QStringLiteral("qml/MyProject/main.qml"&#41;&#41;;
viewer.showExpanded(&#41;;

return app.exec&#40;&#41;;

}@

ImageProcessor.cpp
@#include <QtQml/QQmlEngine>
#include <QtQml/QQmlContext>
#include <QtQuick/QQuickImageProvider>
#include <QDebug>

#include "ImageProcessor.h"

ImageProcessor::ImageProcessor(QObject parent) :
QObject(parent)
{
}
void ImageProcessor::processImage(const QString & filename)
{
QUrl imageUrl(filename);
QQmlEngine * engine = QQmlEngine::contextForObject(this)->engine();
QQmlImageProviderBase * imageProviderBase = engine->imageProvider(imageUrl.host());
QQuickImageProvider imageProvider = static_cast<QQuickImageProvider*>(imageProviderBase);
QSize imageSize;
QString imageId = imageUrl.path().remove(0,1);
QImage image = imageProvider->requestImage(imageId,&imageSize,imageSize);
if(!image.isNull()){

}@

ImageProcessor.h
@#include <QObject>

class ImageProcessor : public QObject
{
Q_OBJECT

public:
explicit ImageProcessor(QObject *parent = 0);

signals:

public slots:
Q_INVOKABLE void processImage(const QString & filename);

};@

MyPage.qml
@
import QtQuick 2.0
import QtMultimedia 5.0
import ImageProcessor 1.0

Rectangle {
anchors.fill: parent

//shows live preview from camera
VideoOutput {
    source: camera
    anchors.fill: parent
    focus : visible
}

//shows captured image
Image {
    id: photoPreview
    anchors.fill: parent
    fillMode: Image.PreserveAspectFit
}

Camera {
    id: camera
    imageProcessing.whiteBalanceMode: CameraImageProcessing.WhiteBalanceFlash
    captureMode: Camera.CaptureStillImage

    exposure {
        exposureCompensation: -1.0
        exposureMode: Camera.ExposurePortrait
    }

    flash.mode: Camera.FlashRedEyeReduction

    imageCapture {
        onImageCaptured: {
            photoPreview.source = preview
            imageProcessor.processImage(preview);
        }
    }
}

MouseArea{
    anchors.fill: parent
    onClicked: {
        camera.imageCapture.capture();
    }
}

//image processor for further image processing

ImageProcessor{
id: imageProcessor
}
}@

My .pro file:
@# Add more folders to ship with the application, here
folder_01.source = qml/MyProject
folder_01.target = qml
DEPLOYMENTFOLDERS = folder_01

Additional import path used to resolve QML modules in Creator's code model

QML_IMPORT_PATH =

The .cpp file which was generated for your project. Feel free to hack it.

SOURCES += main.cpp
ImageProcessor.cpp

Installation path

target.path =

Please do not modify the following two lines. Required for deployment.

include(qtquick2applicationviewer/qtquick2applicationviewer.pri)
qtcAddDeployment()

#allow to use the camera
QT += multimedia
QT += declarative

HEADERS +=
ImageProcessor.h
@

Could this be related to thje QML_IMPORT_PATH ? Any other idea about this ?
Thanks for your help.
François

franchouze

Ok I finally found it :)

The ImageProcessor class should inherits from QQuickItem and not Qobject.

In the pro file remove
QT += declarative
and add
QT += quick

Hope that will help