ASSERT Failure in QAbstractItemModel Pure Virtual Function

[d_stranz]

Well then, if it is the mouse button press that seems to trigger the bad behavior, I would start by putting a breakpoint at the start of that slot and stepping through the code line by line (including stepping into any functions called from within the slot) to see if there is something funny going on.

Another test would be to -not- try to reproduce the problem, but to just use whatever you can of the program -without- clicking the button. If at some point it breaks, then it would indicate that the button click is also a red herring and that the corruption is occurring earlier or somewhere else.

[Corny]

Thanks again for your assistance. I'll give what you suggest a try.

[tuli]

Sine you are lucky and Qt tells you exactly where you went wrong, you also breakpoint the QVector::at function shorty before the error occurs and backtrack from there, with the stack intact.

[ChristianEhrlicher]

121			if(index.isValid())
122				pItem = static_cast<ModelItem*>(index.internalPointer());
123			else
124				pItem = pRoot;
125			return pItem->getData(index.column());

121			if(index.isValid())
122				pItem = static_cast<ModelItem*>(index.internalPointer());
123			else
124				pItem = pRoot;
125			return pItem->getData(index.column());

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What would you expect here instead of an assertion when index is not valid? Hint: when index is not valid, index.column() will not contain a valid column but -1...

[Corny]

121			if(index.isValid())
122				pItem = static_cast<ModelItem*>(index.internalPointer());
123			else
124				pItem = pRoot;
125			return pItem->getData(index.column());

121			if(index.isValid())
122				pItem = static_cast<ModelItem*>(index.internalPointer());
123			else
124				pItem = pRoot;
125			return pItem->getData(index.column());

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What would you expect here instead of an assertion when index is not valid? Hint: when index is not valid, index.column() will not contain a valid column but -1...

Thanks! That pointed out the error of my ways. It seems so obvious now.
Thanks again.

[d_stranz]

Yes, I did a dope slap on my head as well. Sorry for sending you on a wild goose chase when the problem was staring us in the face. Sometimes no matter how carefully you read code, the obvious escapes you.