socket call problem

[paravantinos]

I'm developing an application that connects to the internet to upload some data.
I try to avoid the annoying popup of apn selection everytime a connection is needed, so I use the following function:

def select_apn():
	global apo, apid
	apid = socket.select_access_point()
	apo = socket.access_point(apid)
	socket.set_default_access_point(apo)

and then in my code, i use something like this:

if appuifw.query(u"Game Over. Score:"+str(score)+u" Upload online?", "query") == True:
           global apo
           if apo == None:select_apn()
           name = checkuserid()
           try:
                params = urllib.urlencode({'Name': name, 'Score': score})
                f = urllib.urlopen("http://xxxxx", params)
                result=f.read()
                if result.find("Success")>0:
                    appuifw.note(u"Score was submitted succesfully!", "info")
                else:
                    if appuifw.note(u"Database Error! Try again?", "query")==True:tryagain=1
           except:
                if appuifw.note(u"No valid network found!", "query")==True:tryagain=1
	   apo.stop()

The problem is that, after the default access point selection, the code quits, no error messages, just quits.

Any ideas?

[kandyfloss]

Hi,

I would suggest you to use the following code for setting and unsetting the default access points. You can add your upload statements to this script after the set_accesspoint function call and see if it works.

import appuifw,socket,urllib

def unset_accesspoint():
    f = open('e:\\apid.txt','w')
    f.write(repr(None))
    f.close()
    appuifw.note(u"Default access point is unset ", "info")


def set_accesspoint():
    apid = socket.select_access_point()
    if appuifw.query(u"Set as default access point","query") == True:
        f = open('e:\\apid.txt','w')
        f.write(repr(apid))
        f.close()
        appuifw.note(u"Saved default access point ", "info")
        apo = socket.access_point(apid)
        socket.set_default_access_point(apo)

def download():
    #---------------------- copy from here ---------------------------------------
    try:
        f=open('e:\\apid.txt','rb')
        setting = f.read()
        apid = eval(setting)
        f.close()
        if not apid == None :
            apo = socket.access_point(apid)
            socket.set_default_access_point(apo)
        else:
            set_accesspoint()
    except:
        set_accesspoint()
    #------------------------- copy till here --------------------------------------
    # and put it before the line of code in your script that invokes a connection to the internet
    # like here with urllib.urlretrieve(url, tempfile)

    # your own code here
    url = "http://www.leninsgodson.com/courses/pys60/resources/vid001.3gp"
    tempfile = 'e:\\Videos\\video.3gp'
    urllib.urlretrieve(url, tempfile)
    appuifw.note(u"Video downloaded" , "info")


def quit():
    app_lock.signal()
    appuifw.app.set_exit()

appuifw.app.menu = [(u"unset ap",unset_accesspoint),(u"download",download)]
appuifw.app.exit_key_handler = quit
app_lock = e32.Ao_lock()
app_lock.wait()

Hope it helps

[paravantinos]

Hi Kandyfloss and thanks for the reply!

When I run your code as it is, it works perfectly,

But when I try to integrate it within my application, the same behaviour pops up. It crashes after apn selection.

I suspect that it has something to do with canvas callbacks etc, as I use canvas for the application UI. I'm new to Symbian development, I don't understand well the terms threading, ao, callbacks etc

Do you believe that the problem has to do with canvas interaction with socket?

[paravantinos]

Ok, i found it...

The application uses sensor, and for some reason I had to disconnect sensor before calling socket. Now it works!

Could someone explain me why that happened?