Thread Finished Event in Python

Question

I have a PyQt program, in this program I start a new thread for drawing a complicated image. I want to know when the thread has finished so I can print the image on the form.

The only obstacle I'm facing is that I need to invoke the method of drawing from inside the GUI thread, so I want a way to tell the GUI thread to do something from inside the drawing thread.

I could do it using one thread but the program halts.

I used to do it in C# using a BackgroundWorker which had an event for finishing.

Is there a way to do such thing in Python? or should I hack into the main loop of PyQt application and change it a bit?

Answer 1

In the samples with PyQt-Py2.6-gpl-4.4.4-2.exe, there's the Mandelbrot app. In my install, the source is in C:\Python26\Lib\site-packages\PyQt4\examples\threads\mandelbrot.pyw. It uses a thread to render the pixmap and a signal (search the code for QtCore.SIGNAL) to tell the GUI thread its time to draw. Looks like what you want.