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Better exception handling for both event loop and for when processes exit

This commit is contained in:
PySimpleGUI 2022-05-05 15:49:01 -04:00
parent 8fab8d124e
commit 51f0bbd7a3
1 changed files with 40 additions and 28 deletions
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68
DemoPrograms/Demo_Desktop_Widget_CPU_Top_Processes.py
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@ -42,36 +42,48 @@ def main():
# start cpu measurement thread # start cpu measurement thread
# using the PySimpleGUI call to start and manage the thread # using the PySimpleGUI call to start and manage the thread
window.perform_long_operation(lambda: CPU_thread(window), '-THREAD FINISHED-') window.start_thread(lambda: CPU_thread(window), '-THREAD FINISHED-')
g_interval = 1 g_interval = 1
# ---------------- main loop ---------------- # Unusual construct of a Try around entire event loop... something is crashing, we need to find out what...
while True: try:
# --------- Read and update window -------- # ---------------- main loop ----------------
event, values = window.read() while True:
# print(event, values) # --------- Read and update window --------
# --------- Do Button Operations -------- event, values = window.read()
if event in (sg.WIN_CLOSE_ATTEMPTED_EVENT, 'Exit'): # print(event, values)
sg.user_settings_set_entry('-location-', window.current_location()) # save window location before exiting # --------- Do Button Operations --------
break if event in (sg.WIN_CLOSE_ATTEMPTED_EVENT, 'Exit'):
if event == 'Edit Me': sg.user_settings_set_entry('-location-', window.current_location()) # save window location before exiting
sp = sg.execute_editor(__file__) break
elif event == 'Version': if event == 'Edit Me':
sg.popup_scrolled(__file__, sg.get_versions(), keep_on_top=True, location=window.current_location()) sp = sg.execute_editor(__file__)
elif event == '-CPU UPDATE FROM THREAD-': # indicates data from the thread has arrived elif event == 'Version':
cpu_percent, procs = values[event] # the thread sends a tuple sg.popup_scrolled(__file__, sg.get_versions(), keep_on_top=True, location=window.current_location())
if procs: elif event == '-CPU UPDATE FROM THREAD-': # indicates data from the thread has arrived
# --------- Create dictionary of top % CPU processes. Format is name:cpu_percent -------- cpu_percent, procs = values[event] # the thread sends a tuple
top = {proc.name(): proc.cpu_percent() for proc in procs} if procs:
# --------- Create dictionary of top % CPU processes. Format is name:cpu_percent --------
top = {}
for proc in procs:
try:
top[proc.name()] = proc.cpu_percent()
except Exception as e:
pass # it's OK to get an exception here because processes come and go... one may have gone...
# sg.Print('*** GOT Exception looping through procs ***', c='white on red', font='_ 18')
# sg.Print('Exception = ', e, 'procs=', procs, 'proc', proc)
top_sorted = sorted(top.items(), key=operator.itemgetter(1), reverse=True) # reverse sort to get highest CPU usage on top top_sorted = sorted(top.items(), key=operator.itemgetter(1), reverse=True) # reverse sort to get highest CPU usage on top
if top_sorted: if top_sorted:
top_sorted.pop(0) # remove the idle process top_sorted.pop(0) # remove the idle process
display_string = '\n'.join([f'{cpu/10:2.2f} {proc:23}' for proc, cpu in top_sorted]) display_string = '\n'.join([f'{cpu/10:2.2f} {proc:23}' for proc, cpu in top_sorted])
# --------- Display timer and proceses in window -------- # --------- Display timer and proceses in window --------
window['-CPU PERCENT-'].update(f'CPU {cpu_percent}') window['-CPU PERCENT-'].update(f'CPU {cpu_percent}')
window['-PROCESSES-'].update(display_string) window['-PROCESSES-'].update(display_string)
# get the timeout from the spinner # get the timeout from the spinner
g_interval = int(values['-SPIN-']) g_interval = int(values['-SPIN-'])
except Exception as e:
sg.Print('*** GOT Exception in event loop ***', c='white on red', font='_ 18')
sg.Print('Exception = ', e, wait=True) # IMPORTANT to add a wait/blocking so that the print pauses execution. Otherwise program continue and exits
window.close() window.close()