由于许可问题,我设法使用 PySide 而不是 PyQt。
我需要使用信号/槽机制在线程之间传递自定义对象。使用 PyQt,我可以使用 PyQt_PyObject
类型作为信号参数,但显然,这种类型在 PySide 中不存在:
TypeError: Unknown type used to call meta function (that may be a signal): PyQt_PyObject
我尝试使用object
而不是PyQt_PyObject
,但只有信号和插槽之间的 DirectConnection 类型才会发生这种情况:
self.connect(dummyEmitter,
QtCore.SIGNAL("logMsgPlain(object)"),
self._logMsgPlain,
QtCore.Qt.DirectConnection)
使用 QueuedConnection 时,我收到错误:
QObject::connect: Cannot queue arguments of type 'object'
(Make sure 'object' is registered using qRegisterMetaType().)
我说“事情发生了”是因为到目前为止它还不起作用。我现在由于 DirectConnection 类型而收到错误:
QObject::startTimer: timers cannot be started from another thread
QPixmap: It is not safe to use pixmaps outside the GUI thread
etc ...
我该怎么办? PySide 中是否有类似 PyQt_PyObject 类型?
编辑: 这个小例子将会失败:
from PySide import QtCore, QtGui
import sys
class Object(QtCore.QObject):
''' A dummy emitter that send a list to the thread '''
def emitSignal(self):
someList = [0, 1, 2, 3]
self.emit(QtCore.SIGNAL("aSignal(object)"), someList)
class Worker(QtCore.QObject):
def aSlot(self, value):
print "List: {}".format(value)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
worker = Worker()
obj = Object()
thread = QtCore.QThread()
worker.moveToThread(thread)
QtCore.QObject.connect(obj, QtCore.SIGNAL("aSignal(object)"), worker.aSlot)
# The exemple will pass with the line below uncommented
# But obviously, I can't use a DirectConnection with a worker thread and the GUI thread
# QtCore.QObject.connect(obj, QtCore.SIGNAL("aSignal(object)"), worker.aSlot, QtCore.Qt.DirectConnection)
thread.start()
obj.emitSignal()
app.exec_()
最佳答案
目前,我找到的唯一解决方案是切换到新样式的信号/槽语法:
from PySide import QtCore, QtGui
import sys
class Object(QtCore.QObject):
aSignal = QtCore.Signal(object)
def emitSignal(self):
someList = [0, 1, 2, 3]
self.aSignal.emit(someList)
class Worker(QtCore.QObject):
def aSlot(self, value):
print "List: {}".format(value)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
worker = Worker()
obj = Object()
thread = QtCore.QThread()
worker.moveToThread(thread)
obj.aSignal.connect(worker.aSlot)
thread.start()
obj.emitSignal()
app.exec_()
但是我很想知道是否有旧式语法的解决方案,但目前看来还没有。
关于python - 在信号/槽中使用自定义对象(类似 PyQt_PyObject),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47602743/