QVariant : save : unable to save type 128

Hi

I have a custom QAbstractItemModel with drag and drop support. I reimplemented methods like mimeData() and itemData() to serialize informations I want to drag from a view to another.
It works fine with Qt 4.7.2.

Recently I had to downgrade Qt to Qt 4.6.2 (to have standard Qt libs on linux x86_64).

Now when I drag an item from a view, a Qt debug message appears, and DnD does not work :

Quote:

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QVariant : save : unable to save type 128

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128 stands for built-in type QMetaType::VoidStar (which is exactly what I store in itemData), as if Qt was not able to serialize a QVariant(void*) into a QDataStream, which is weird because VoidStar appears to be a built-in type !

I tried redefining stream operators for void* and register them with

Code:

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qRegisterMetaTypeStreamOperators<void*>("void*");

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but to no avail, same message appears .. So I'm stuck and I can't figure out what is wrong. Anybody has a hint ?

Code:

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QMap<int, QVariant>
MyModel::itemData(const QModelIndex &index) const
{
	QMap<int, QVariant> roles;
	roles.insert(Qt::DisplayRole, data(index,Qt::DisplayRole));
	roles.insert(ITEM_TYPE_ROLE, data(index,ITEM_TYPE_ROLE));
	// store a void* here
	roles.insert(ITEM_POINTER_ROLE, qVariantFromValue((void *) index.internalPointer())) ;
 
	return roles;
}

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Code:

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QMimeData*
MyModel::mimeData(const QModelIndexList & indexes) const
{
	if (indexes.count() <= 0)
			return 0;
	QStringList types = mimeTypes();
	if (types.isEmpty())
		return 0;
	QMimeData *data = new QMimeData();
	QString format = types.at(0);
	QByteArray encoded;
	QDataStream stream(&encoded, QIODevice::WriteOnly);
	QModelIndexList::ConstIterator it = indexes.begin();
	for (; it != indexes.end(); ++it)
	{
		QMap<int,QVariant> mapz = itemData(*it);
		stream << mapz;		// QVariant : save : unable to save type 128
	}
	data->setData(format, encoded);
	return data;
}

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