Connect the signal in the C++ QML?

Hello

Sorry in advance for this noobish question

My QML, I'd like to call C++ function to call the camera and then on the saved photo, I would like to save the url for further processing.

The invocation and the seizure of the URL does not work correctly.

The problem is that I can't send a signal of C++ to QML to send the url to QML for further processing.

Trigger from QML:

Button {
   text: "Snapshot"
   onClicked: {
    app.invokeCamera();
   }
}

void App::invokeCamera() {
    InvokeRequest request;
    request.setTarget("sys.camera.card");
    request.setAction("bb.action.CAPTURE");
    QByteArray data;
    data.append("full");
    request.setData(getShareRecipeData());
    mInvokeManager->invoke(request);
}

void App::childCardDone(
        const bb::system::CardDoneMessage &doneMessage) {
    QString url = "";
    qDebug() << "childCardDone reason:" << doneMessage.reason();
    qDebug() << "childCardDone data:" << doneMessage.data();

    if (doneMessage.reason().compare("save") == 0) {
        url = "file://" + doneMessage.data();
    } else if (doneMessage.reason().compare("save") == 0) {
        showError(doneMessage.data());
    }
// This doesn't seem to send to QML
    emit cameraCaptureCompleted(url);
}

In C++:

signals:
    void cameraCaptureCompleted(const QString &url);

QML to signal received (somehow this must be duplicated?)

signal cameraCaptureCompleted (string imageLink)
onCameraCaptureCompleted: {}
Console.Debug ("link to the image:" + imageLink);

}

The onCameraCaptureCompleted never triggered. The console.debug ("link to the image:" + imageLink); did not show anything.

Thanks for your help!

OK, I went back and looked at your provided code again and I see you try to put your location of onCameraCaptureCompleted on the Page, which certainly won't work, since the Page is not the class that has the cameraCaptureCompleted signal. I suggest one of these three approaches:

Page {   id: myPage
   attachedObjects: [
      App {
         id: myApp
         onCameraCaptureCompleted: {
            // ---Do your stuff
         }
      }
   }
}

... or if you prefer the Manager to appear on the page do this way:

Page {
   id: myPage
   attachedObjects: [
      App {
         id: myApp
      }
   }
   function cameraCaptureCompletedHandler( imageLink ) {
      // ---Do your stuff
   }
   onCreationCompleted: {
      myApp.cameraCaptureCompleted.connect(myPage.cameraCaptureCompletedHandler);
   }
}

If you don't want to mess with connect() you could do the last example that much too:

Page {
   id: myPage
   attachedObjects: [
      App {
         id: myApp
         onCameraCaptureCompleted: {
            myPage.cameraCaptureCompletedHandler( imageLink );
         }
      }
   }
   function cameraCaptureCompletedHandler( imageLink ) {
      // ---Do your stuff
   }
}

Of course, all these examples assume that you have successfully exposed the App class to QML with qmlRegisterType(). The signal you want to respond to being on the App class, you must place your location, or connect the App::cameraCaptureCompleted signal to your location explicitly.

Hope it is clearer to you now.

Tags: BlackBerry Developers

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=======================================
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