[qt4,win,g++] model/view programming: selection, internal pointer wrong ?!

[jh]

hi,
i get a selection model from a treeview and connect signal
selectionChanged to the following method:



void
Container_Widget::selectionChanged(const QItemSelection& selected,
const QItemSelection& deselected)
{

printf("<Container_Widget::selection changed()>\n");
fflush(stdout);

QModelIndexList indexlist = selected.indexes();
QListIterator<QModelIndex> it(indexlist);

while(it.hasNext()) {

QModelIndex modelindex = it.next();

if(!modelindex.isValid()) {
printf("Container_Widget::selectionChanged() : model index not valid \n");
fflush(stdout);
continue;
}

printf("Container_Widget::selectionChanged() : row = %d, col = %d \n",
modelindex.row(), modelindex.column() );
fflush(stdout);

Container_ModelItem* item
= static_cast<Container_ModelItem*>(modelindex.internalPointer());

... call some method of item -> segfault !!

}

printf("</Container_Widget::selection changed()>\n");
fflush(stdout);

}


the problem is that the internal pointer of the model index
cannot be of class Container_ModelItem,
since if i call a method of this class the program crashes.
i checke already all methods of the model which return a QModelIndex,
i could'nt find a mistake there.
where is the mistake?

bets regards,
jh

[wysota]

First of all use dynamic_cast instead of static one. And second of all, it's not possible to help you without seeing the source of the model, at least its index() method.

[jh]

i already found the problem. i used a sorting proxy model which was
invalid.

thanx.

jh