[pygtk] Need help with spawn_async and callback

[Tony Freeman]

Hello Grant,

Below is the entire bit of code I was working on at that time.  Pay
attention to the spawn_async stuff. Good luck!

-- Tony



#!/usr/bin/python

####################################################
## THIS IS A GUI FRONT END TO THE adjust_grids.sh
## SCRIPT LOCATED IN /DATA/LOCAL/IFPS/
##
## t0ny.fr33man at noaa.gov (26 July 2010)
##
####################################################

####################################################
## SETUP THE ENVIRONMENT:
####################################################

import pygtk
import gtk
import gtk.glade
import gobject
import os

os.chdir("/awips/dev/localapps/adjust_grids/")

####################################################
### GLOBAL VARIABLES AND SITE CONFIGURATION:
####################################################

import siteConfig

xxxxxx  = siteConfig.xxxxxx
guess   = siteConfig.guess
program = siteConfig.program

### GLOBAL VARIABLES:

keep_pulsing = True

####################################################
### PULL IN THE GUI:
####################################################

wTree = gtk.glade.XML('adjust_grids.glade')

### MAIN WINDOW ITEMS (window1):

calendar  = wTree.get_widget('calendar1')
gridbox   = wTree.get_widget('combobox_grid')
modelbox  = wTree.get_widget('combobox_model')
hourbox   = wTree.get_widget('combobox_hour')
statusbar = wTree.get_widget('label_status')

### PROGRESS WINDOW ITEMS (window2):

window2 = wTree.get_widget('window2')
dialog1 = wTree.get_widget('dialog1')

progressbar = wTree.get_widget('progressbar1')
progress_headline = wTree.get_widget('label_progress_headline')
progress_info = wTree.get_widget('label_progress_info')

textview = wTree.get_widget('textview1')
textbuffer=textview.get_buffer()

####################################################
### FILL IN THE LIST BOXES:
####################################################

for i in xxxxxx:
	gridbox.append_text(i)

for i in guess:
	modelbox.append_text(i)

gridbox.set_active(0)
modelbox.set_active(0)
hourbox.set_active(0)

####################################################
### DEFINE FUNCTIONS:
####################################################

def write_status(comment):
	statusbar.set_text(comment)
	progress_info.set_text(comment)

def cstdout_callback(fd, condition, channel):
	global keep_pulsing
	if condition == gobject.IO_HUP:
		keep_pulsing=False
	elif condition == gobject.IO_IN:
		text = channel.readline()
		iter = textbuffer.get_end_iter()
		textbuffer.insert(iter, text)
		textview.scroll_to_mark(textbuffer.get_insert(),0)
	return keep_pulsing

def update_progress_callback():
	global keep_pulsing
	if keep_pulsing:
		progressbar.pulse()
	else:
		write_status("Done")
		window2.hide()
	return keep_pulsing

def run_command(command):
	global keep_pulsing
	keep_pulsing=True
	textbuffer.set_text("")
	(cpid, cstdin, cstdout, cstderr) =
gobject.spawn_async(command,flags=gobject.SPAWN_DO_NOT_REAP_CHILD,standard_output=True)
	channel = os.fdopen(cstdout)
	gobject.io_add_watch(cstdout, gobject.IO_HUP|gobject.IO_IN,
cstdout_callback, channel)
	gobject.timeout_add(150, update_progress_callback)
	window2.show()

def get_active_text(combobox):
	model = combobox.get_model()
	active = combobox.get_active()
	if active < 0:
		return None
	return model[active][0]

def build_timestamp():
	year, month, day = calendar.get_date()
	hour = get_active_text(hourbox)
	month = "%02d" % month
	day = "%02d" % day
	timestamp = str(year) + str(month) + str(day) + "_" + str(hour)
	return timestamp

def on_dialog1_destroy(*args):
	write_status("Backgrounded script")
	dialog1.hide()

def on_closebutton1_clicked(*args):
	write_status("Backgrounded script")
	dialog1.hide()

def on_window1_destroy(*args):
	write_status("Good-bye!")
	gtk.main_quit()

def on_window2_destroy(*args):
	window2.hide()
	dialog1.show()
	write_status("Continuing in background")
	return True

def on_window2_delete_event(*args):
	window2.hide()
	dialog1.show()
	write_status("Continuing in background")
	return True

def on_button_quit_clicked(*args):
	write_status("See ya next time")
	gtk.main_quit()

def on_button_apply_clicked(*args):
	scripttime = build_timestamp()
	scriptmodel = get_active_text(modelbox)
	scriptgrid = get_active_text(gridbox)
	command = [program, scriptgrid, scriptmodel, scripttime]
	write_status("Here we go ...")
	run_command(command)

####################################################
### CONNECT SIGNALS TO OUR HANDLERS:
####################################################

wTree.signal_autoconnect(locals())

####################################################
### START UP THE PROGRAM:
####################################################

gtk.main()


On Wed, Aug 3, 2011 at 7:44 AM, Grant McWilliams
<grantmasterflash at gmail.com> wrote:
> Tony Freeman <t0ny.fr33man <at> gmail.com> writes:
>
> Can you post the whole code anyway for those of us trying to figure out the same
> thing.
>
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