racing condition problem with positioning module

[oyuky]

hello people, is there any trick for solving racing condition problems involving positioning module? In the following code im getting NameError :global name 'e' is not defined. it seems this line "canvas.text( (2,12), unicode(str(e["latitude"])))" is called before my internal gps gives my position (it takes like 30 seconds), is there any way of making this work?
i also tried adding "the normal" applicatin body to stop and wait for exist but im having the same racing condition problem...
any hint would be appreciated.
thanks

from graphics import *
import appuifw
import e32
import positioning

appuifw.app.screen='normal'
appuifw.app.title=unicode('My Test App')
canvas=appuifw.Canvas()
appuifw.app.body=canvas



positioning.select_module(positioning.default_module())

positioning.set_requestors([{"type":"service",
                             "format":"application",
                             "data":"test_app"}])



def cb(event):
    global e
    e = event["position"]


d= positioning.position(course=1,satellites=1,callback=cb, interval=500000,partial=0)


canvas.clear()
canvas.text( (2,12), unicode(str(e["latitude"])))
canvas.text( (2,24), unicode(str(e["longitude"])))
e32.ao_yield()
e32.ao_sleep(1115)

[kandyfloss]

You could use the usual print to the Console option if Canvas is not your priority requirement.

I do not see any hinches with the code. Do you run it as a script or as a standalone?

If standalone, does it work fine as a script?

[oyuky]

hello, i need to print in canvas. printing in console works fine, but its not what i need. Im running the code as script.

thanks

[JOM]

im getting NameError :global name 'e' is not defined

You could try adding a check, for example (untested, just writing):

# Initialize variable before anything else
e = None

...

if e and e.has_key('latitude'):
    s = unicode(str(e["latitude"]))
else:
    s = u"Not defined"
canvas.text( (2,12), s)

[oyuky]

it works perfect thanks