Trying to display map on a widget

[PcNy]

Hello, I'm currently trying to develop an application that displays map.
I designed the interface with Designer and there was a GraphicsView in it.
It can be compiled and run but simulator shows nothing and exited with code -1073741819

Here is the code

mappingManager = 0;
    routingManager = 0;
    searchManager = 0;
    QGeoServiceProvider serviceProvider("nokia");
    if (serviceProvider.error() == QGeoServiceProvider::NoError) {
        mappingManager = serviceProvider.mappingManager();
        routingManager = serviceProvider.routingManager();
        searchManager = serviceProvider.searchManager();
    }
    QGraphicsGeoMap *map = new QGraphicsGeoMap(mappingManager);

    scene = new QGraphicsScene;
    ui->gvMap->setScene(scene);
    ui->gvMap->scene()->addItem(map);

ui->gvMap is GraphicsView widget that I designed with designer in mainwindow.ui.
The code above is placed in mainwindow.cpp

When I comment this line out, the app can run and no exited with such code but the map will not display.

ui->gvMap->scene()->addItem(map);

Please help me

[symbianyucca]

you could maybe chekc what do you do differently with working examples: http://wiki.forum.nokia.com/index.php/Qt_Maps_Examples

[PcNy]

you could maybe chekc what do you do differently with working examples: http://wiki.forum.nokia.com/index.php/Qt_Maps_Examples

Yes, I've looked at HelloMap example. The difference is I use GraphicsView that I created in the Designer but the example uses GraphicsView object created by coding.
I'm not sure whether this might be the problem?

[symbianyucca]

did you try wheter the example works and shows the map in your environment also ? as well as did you check that you are doing the maps APIs construction after the connection has been successfully established ?

[PcNy]

Yes, I tried to run HelloMap example and it could run on my environment.
Here is my code attached.
http://www.mediafire.com/?z6fc1a3a0czsyn6

[symbianyucca]

I'm sorry but I don't really have time on going through other people projects, thus please see how the Helloworld maps is initialized, and see whether you do something differently.

[PcNy]

I just figured this out. After I changed QGeoServiceProvider object to a pointer, it could work.
But now the problem is about displaying.
The map does not seem to fit in my GraphicsView
I tried to use

map-resize(view->size());

but no luck, the map is still much smaller than the GraphicsView.
Is this because I use grid layout so the actual map size is much smaller than I see in designer?

[symbianyucca]

I would not havr any idea on that, the map was sizing it self as wanted with those examples I made in wiki.