[Qgis-developer] QGIS, Python and Threads

[Matthias Ludwig]

Hello,

I try to write a plugin in python. The plugin will be part of a complex plugin and will make a longer running numpy calculation. I want the GUI to be responsive during the calculation. As a basis I used Aaron Racicots(http://svn.reprojected.com/qgisplugins/trunk/threading_demo/) threading example and modified the run code (the calculation is only an example). Unfortunately it does not what I want it to do...it hangs during calculation. Did I missed a thing?


import numpy

class TestThread(QThread):
    def __init__(self, parentThread,parentObject):
        QThread.__init__(self, parentThread)
        self.parent = parentObject
        self.running = False
        self.total = 0
        self.currentCount = 0

    def __del__(self):
        self.running = False
        self.wait()
        
    def run(self):
        self.running = True        
	A = numpy.random.random((2000,2000))
	b = numpy.random.random((2000,1))
	x = numpy.linalg.solve(A, b)
	print x.trace()
        self.emit(SIGNAL("runFinished(PyQt_PyObject)"),"Pass")
        self.stop()

    def stop(self):
        self.running = False
        
    def getUpdate(self):
        return self.currentCount