On 1/15/13 9:46 AM, Fabien Lafont wrote:
I've changed the program according to your remarks. It works fine! I
have only one problem. I want to start the new thread when I clik on a
QPushButton but If I just remove
thread = AThread()
thread.start()
from
if __name__ == "__main__":
qApp = QtGui.QApplication([" "])
aw = ApplicationWindow()
aw.showMaximized()
thread = AThread()
thread.start()
sys.exit(qApp.exec_())
and I create a single button :
def demarrer(self):
thread = AThread()
thread.start()
The program crashes and "say": QThread: Destroyed while thread is
still running
Do you have any idea?
Without trying this myself, I'm guessing what's happening is that the
thread object is getting destroyed/garbage collected after the
"demarrer" function is finished. When that function gets called the
"thread = AThread()" line creates the "AThread" instance and assigns it
to the local variable name "thread", which is a handle to the actual OS
level thread. When the function exits that local variable "thread" does
not exist anymore and will eventually be garbage collected. This is
probably where the error message is coming from because the QThread
object ("thread") is destroyed (garbage collected) while the low-level
thread is still running.
My suggestion, as a starting point, would be to create a class instance
attribute by doing "self.child_thread = AThread()". This way when the
function exists there is still a pointer to the QThread object. Don't
forget you still need to kill the thread off before the application
finishes, otherwise you'll probably still get this error after
everything closes. I think you were using a qApp.exit signal for that
before. Hope this helps.
-Dave
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