Hello,
i have upgraded my linux development machine from pyqt 4.4.4 to 4.5.4 (and sip
4.7.9 to 4.8.2) and i am getting any errors with my application. My Qt version
it is 4.5.2 but errors are related to pyqt version because if i downgrade pyqt
all works, well obviously can be problems with my code (i think so), but i mean
that with pyqt 4.4.4 the code works.
1) i am using a QThread to populate large sql queries data to a model in
background. Inside the class run method i create a worker object (worker it is a
QObject subclass) and run an event loop to connect the worker and the thread
with signals and slots, it have been running fine with all pyqt 4.4 versions but
i now get this error:
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QueryModelThread(0xa00db20), parent's thread is QThread(0x9f0a748),
current thread is QueryModelThread(0xa00db20)
code:
class QueryModelThread(QThread):
def __init__(self, parent=None):
super(QueryModelThread, self).__init__(parent)
self.worker = None
def executeModel(self, texto_query):
self.emit(SIGNAL("executeModel"), texto_query)
def executeQuery(self, texto_query):
self.emit(SIGNAL("executeQuery"), texto_query)
def stopIfRunning(self):
if self.worker:
self.worker.stopIfRunning()
def run(self):
worker = Worker()
self.connect(self, SIGNAL("executeModel"), worker.slotExecuteModel)
self.connect(worker, SIGNAL("finalizado"), self, SIGNAL("finalizado"))
self.connect(worker, SIGNAL("redimensiona"), self,
SIGNAL("redimensiona"))
self.connect(worker, SIGNAL("comenzado"), self, SIGNAL("comenzado"))
self.connect(worker, SIGNAL("nuevas_filas"), self,
SIGNAL("nuevas_filas"))
self.connect(self, SIGNAL("executeQuery"), worker.slotExecuteQuery)
self.connect(worker, SIGNAL("query_preparada"), self,
SIGNAL("query_preparada"))
self.worker = worker
self.exec_()
init of the worker class:
class Worker(QObject):
def __init__(self, parent=None):
super(Worker, self).__init__(parent)
self.db = database.conectarDbTienda("QueryModelThread")
self.query = QSqlQuery(self.db)
self.stop = self.corriendo = False
2) i have many models that use a set of shared methods (apart from Qt's models
methods) so i created a python class
(editor_documentos_base.EditorDocumentosBaseModel) with all this methods and in
my models i use this multiple inheritance.
class AlbaranEntradaModel(QAbstractTableModel,
editor_documentos_base.EditorDocumentosBaseModel):
def __init__(self, parent):
super(AlbaranProveedorModel, self).__init__()
editor_documentos_base.EditorDocumentosBaseModel.__init__(self)
rowCount and columnCount are implemented in this base class and now when i call
tableView.setModel(sampleModel) (where sampleModel it is the instance of one of
my models) i get this errors:
NotImplementedError: QAbstractTableModel.rowCount() is abstract and must be
overridden
NotImplementedError: QAbstractTableModel.columnCount() is abstract and must be
overridden
3) i know that signals and slots have changed with this versions but i thought
the old syntax it is still support for compatibility, i get this error emitting
this signal, do i am wrong or this is other problem?
self.emit(SIGNAL("cambiaFoto(QVariant, QVariant)"), QVariant(), QVariant())
TypeError: argument 0 of signal PyQtProxy.ambiaFoto(QVariant,QVariant) has an
invalid type
I have never detected a bug in PyQT, i think it is a great piece of software
(sip too!) so i suppose all of this is my fault but i need a bit of help to
understand where it is the problem, thanks in advance.
Regards,
Miguel Angel.
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