How to remove all rows and chiled rows from QTreeview

[umen]

Hi
i dont know why im get into trouble with removing all rows and sub rows from qtreeview
im using QStandardItemModel as the model . now here is my code that doesn't work .

QModelIndex FirstQModelIndex;
QModelIndex parentQModelIndex;
int iMdlChidCound = m_model->hasChildren();
if(iMdlChidCound > 0)
{
	// only if there at list 1 row in the view 
	FirstQModelIndex = m_model->item(0,0)->index();
	QStandardItem* feedItem = m_model->itemFromIndex(FirstQModelIndex);
	// get the parent of the first row its the header row 
	QStandardItem* parentItem = feedItem->parent();
 
 
	// here im getting exception 
	int parent_rows= parentItem->hasChildren();
	parentQModelIndex = m_model->indexFromItem(parentItem);
 
 
	// now i like to delete all the rows under the header , and its dosnt work 
	if(parent_rows>0)
	{
		bool b = feedItem->model()->removeRows(0,y,parentQModelIndex);
	}
}

QModelIndex FirstQModelIndex;
QModelIndex parentQModelIndex;
int iMdlChidCound = m_model->hasChildren();
if(iMdlChidCound > 0)
{
	// only if there at list 1 row in the view 
	FirstQModelIndex = m_model->item(0,0)->index();
	QStandardItem* feedItem = m_model->itemFromIndex(FirstQModelIndex);
	// get the parent of the first row its the header row 
	QStandardItem* parentItem = feedItem->parent();


	// here im getting exception 
	int parent_rows= parentItem->hasChildren();
	parentQModelIndex = m_model->indexFromItem(parentItem);
	 
	
	// now i like to delete all the rows under the header , and its dosnt work 
	if(parent_rows>0)
	{
		bool b = feedItem->model()->removeRows(0,y,parentQModelIndex);
	}
}

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