Exploring the items of a QtreeWidget using its model

[tonnot]

I have a QtreeWidget, and I want to 'explore' it using it model data.
I have a vector<QStandardItemModel*>. First I add the main model for the tree.
I explore it and add new models to my vector if I find nodes with children.
( I think that with a simple code I can transverse the whole tree).

Ok, now I have :

tree_model= (QStandardItemModel*)QTreeWidget->model();
tree_model->rowCount();
tree_model->columnCount();

tree_model= (QStandardItemModel*)QTreeWidget->model();
tree_model->rowCount();
tree_model->columnCount();

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But I dont know how to get the 'node' data. (text and datamodel)
I have to use a modelIndex?

QModelIndex  mi = tree_model>index(row, col); ???

QModelIndex  mi = tree_model>index(row, col); ???

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But I could to use:

tree_model->item(row,col)->text();
tree_model->item(row,col)->has_children;
tree_model->item(row,col)->model()

tree_model->item(row,col)->text();
tree_model->item(row,col)->has_children;
tree_model->item(row,col)->model()

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But I have errors .... And I don find nothing useful at help reference
Any help ? Thanks.