For anyone that is interested, the way I ended up doing this was polling
the nitems_written() function of the head block, and once it reached the
terminal value, calling another function to quit the QT application. Then I
connected that function call to the other quitting() procedure. Seems kind
of roundabout, but works.
-Michael
---
qapp = Qt.QApplication(sys.argv)
def quitQT():
qapp.quit()
max_n_samps = 1000000
tb = top_block_cls()
tb.start()
tb.show()
def check_status():
fg_is_done = 0
while not fg_is_done:
time.sleep(1)
if (tb.blocks_head_0.nitems_written(0) == max_n_samps):
fg_is_done = 1
quitQT()
def quitting():
tb.stop()
tb.wait()
qapp.connect(qapp, Qt.SIGNAL("aboutToQuit()"), quitting)
qapp.connect(qapp, Qt.SIGNAL("quitQT()"), quitting)
checker = Thread(target=check_status)
checker.start()
qapp.exec_()
On Mon, May 16, 2016 at 9:40 AM, Michael Wentz <mchlw...@gmail.com> wrote:
> Hi,
>
> Is there a way to automatically close a QT graphical sink after a
> flowgraph is done running? For example, I want to read in samples from a
> USRP, demodulate and plot the constellation, and then close everything
> automatically. My flowgraph looks like this:
>
> USRP --> Head --> Demodulator --> QT Constellation Sink
> |
> --------------> File Sink
>
> The head block stops the processing after a prescribed number of samples,
> but the QT sink remains open until I manually close it. If I disable
> graphics I can get this to run how I'd like, but having the option to see
> the constellation is important for me.
>
> I've initially implemented this using a separate thread with a timer (see
> below), but it seems like there should be a cleaner way of doing this?
>
> Thanks,
> Michael
>
> ---
>
> qapp = Qt.QApplication(sys.argv)
>
> tb = top_block_cls()
> tb.start()
> tb.show()
>
> def quitter():
> time.sleep(run_time_in_seconds)
> qapp.quit()
>
> def quitting():
> tb.stop()
> tb.wait()
>
> qapp.connect(qapp, Qt.SIGNAL("aboutToQuit()"), quitting)
>
> t = Thread(target=quitter)
> t.start()
>
> qapp.exec_()
>
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