Need help with NetImageTracker/Manager

Hi all

I need help to understand how NetImageTracker works. What I want to achieve is to download the images into listview, but I'm trying to use it directly from C++. What I have right now is declaring a new ImageTracker Net and then I use the function imageSource, but for some reason I can't pass my url in there.

So I have

NetImageTracker* nit = new NetImageTracker();

nit->setImageSource(QUrl(feed.value("url")));

but I don't think that the way it was suppose to work. the feed.value ("url") is a json file I upload to the web

Thank you for the help

You will need create a NetImageManager instance which will use all the NetImageTrackers:

To all:

NetImageManager * manager_;

In the constructor:

manager_ = new NetImageManager (this);

When to create ImageTrackers also put their parents so they will be automatically destroyed as well as parent:

NetImageTracker * nit = new NetImageTracker (this);
or
NetImageTracker * nit = new NetImageTracker (manager_); If you want to define manager_ as parent

Configure ImageTrackers with instance of NetImageManager:

nit-> setManager (manager_);

Set the URL of the image to load: (use setSource, not setImageSource because it contains the result)

nit-> setSource (QUrl (urlString));

Connect to the imageSourceChanged signal and when it starts to get the URL of the uploaded image.

In the signal handler:

NetImageTracker * Tracker = (NetImageTracker *) sender();

QString urlStr = Tracker-> getImageSource();

QUrl url = QUrl (urlStr);

This url can be used in ImageView

Tracker-> deleteLater(); possibly destroy NewImageTracker because it is no longer necessary

Tags: BlackBerry Developers

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