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POHow to move an object back and forth between QThreads in Pyqt
 

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  1. POHow to move an object back and forth between QThreads in Pyqt
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    <p>In my program (using Python 2.7), I create an object containing some important data and methods. Some of the methods are CPU hungry, so in certain cases I move the object to a new QThread for the duration of the CPU intensive methods, then have them come back to the main thread. At a later point, when a CPU intensive method is called, I would like to move the object to another QThread again, however this fails saying "Current thread is not the object's thread".</p> <p>Here is a trivial example which reproduces the problem:</p> <pre><code>import sys from PyQt4 import QtCore, QtGui from time import sleep class ClassA(QtGui.QDialog): def __init__(self): super(ClassA, self).__init__() mainLayout=QtGui.QVBoxLayout() self.lineEdit=QtGui.QLineEdit() mainLayout.addWidget(self.lineEdit) self.setLayout(mainLayout) self.show() self.obj=ClassC(self) self.executeProgram() def executeProgram(self): self.lineEdit.setText("Starting new thread...") self.thread=QtCore.QThread() self.obj.moveToThread(self.thread) self.thread.started.connect(self.obj.doWork) self.obj.doingWork.connect(self.updateGui) self.obj.finished.connect(self.killThread) self.thread.start() def updateGui(self,message): self.lineEdit.setText(message) def killThread(self): self.thread.quit() self.thread.wait() self.obj.finished.disconnect() self.executeProgram() class ClassC(QtCore.QObject): finished=QtCore.pyqtSignal() doingWork=QtCore.pyqtSignal(str) def __init__(self,parent=None): super(ClassC, self).__init__() def doWork(self): for i in range(5): self.doingWork.emit("doing work: iteration "+str(i)) sleep(1) self.finished.emit() if __name__=="__main__": app=QtGui.QApplication(sys.argv) obj=ClassA() app.exec_() </code></pre> <p>Is it possible to move an object to a different QThread multiple times? If so, how would I fix my code to do this?</p>
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