[PyQt] Re: memory corruption storing python objects in a QModelIndex with createIndex

[Erick Tryzelaar]

On Tue, Sep 30, 2008 at 8:04 PM, Erick Tryzelaar
<idadesub at users.sourceforge.net> wrote:
> Could this possibly be the source of my trouble?

It doesn't appear to be. I modified it to use internalId and a global
variable and it still segfaults. I've reduced this down as much as I
can, does anyone have any idea why this keeps crashing?


import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Node:
    def __init__(self, parent):
        self.parent = parent
        self.children = {}

    def child(self, row):
        try:
            return self.children[row]
        except KeyError:
            node = self.children[row] = Node(self)
            return node

class Model(QAbstractItemModel):
    def __init__(self, parent=None):
        QAbstractItemModel.__init__(self, parent)
        self.root = Node(None)

    def rowCount(self, parent=QModelIndex()):
        return 1

    def columnCount(self, parent=QModelIndex()):
        return 1

    def hasChildren(self, index):
        return True

    def parent(self, index):
        if not index.isValid():
            return QModelIndex()

        parentNode = index.internalPointer().parent
        if not parentNode:
            return QModelIndex()

        return self.createIndex(0, 0, parentNode)

    def index(self, row, column, parent=QModelIndex()):
        if column != 0:
            return QModelIndex()

        if parent.isValid():
            parentNode = parent.internalPointer()
        else:
            parentNode = self.root

        return self.createIndex(row, column, parentNode.child(row))

    def data(self, index, role=Qt.DisplayRole):
        if not index.isValid() or role != Qt.DisplayRole:
            return QVariant()

        return QVariant('a')

def main():
    app = QApplication(sys.argv)

    model = Model()

    window = QTreeView()
    window.setModel(model)
    window.resize(QSize(600, 300))
    window.show()
    sys.exit(app.exec_())

main()